CN116456467A

CN116456467A - Method performed by user equipment and user equipment

Info

Publication number: CN116456467A
Application number: CN202210007403.3A
Authority: CN
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2023-07-18
Also published as: WO2023131074A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: selecting and generating a selected sidestream communication scheduling license; performing transmission resource selection or reselection; and determining the earliest transmission opportunity in the time domain in all the selected or reselected transmission opportunities as an initial transmission opportunity, and retransmitting the other transmission opportunities.

Description

Method performed by user equipment and user equipment

Technical Field

The present invention 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 mode 2, 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, performs resource selection (resource selection) or resource re-selection (resource re-selection).

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 comprises the following three 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) The communication reliability of the resource allocation mode 2 in NR side-row communication is researched and improved, and the communication time delay of the resource allocation mode 2 is reduced;

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

The scheme of the patent comprises a method that when the user equipment is configured with SL DRX, the sidestream communication user equipment triggers resource selection or resource reselection.

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 invention provides a method performed by a user equipment and the user equipment.

The method performed by the user equipment of the first aspect of the present invention comprises: selecting and generating a selected sidestream communication scheduling license; performing transmission resource selection or reselection; and determining the earliest transmission opportunity in the time domain in all the selected or reselected transmission opportunities as an initial transmission opportunity, and retransmitting the other transmission opportunities.

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

According to the method of the first aspect of the present invention, the one selected sidestream traffic scheduling grant corresponds to transmission of a plurality of or one medium access control layer protocol data unit MAC PDU.

According to the method of the first aspect of the present invention, if the checking result of the resource selection or reselection is triggering the resource selection or reselection, the transmission resource selection or reselection is performed.

According to the method of the first aspect of the present invention, the resource allocation manner of the ue is: based on the perceived resource allocation; or based on a partially perceived resource allocation; or random resource selection.

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

According to the method of the first aspect of the present invention, the user equipment selects the first sidestream communication time-frequency resource for the one transmission opportunity at least according to the first sidestream communication time-frequency resource being in an active period of SL DRX; and/or the user equipment selects the second sidestream communication time-frequency resource, at least so that the selected second sidestream communication time-frequency resource and/or the earliest resource in the time domain in the first sidestream communication time-frequency resource is in the active period of the SL DRX.

According to the method of the first aspect of the present invention, if the user equipment does not select HARQ retransmission, the first sidestream communication time-frequency resource is selected for the one transmission opportunity at least according to the first sidestream communication time-frequency resource being in an active period of SL DRX; and/or the user equipment selects the second sidestream communication time-frequency resource, at least so that the selected second sidestream communication time-frequency resource and/or the earliest resource in the time domain in the first sidestream communication time-frequency resource is in the active period of the SL DRX.

According to the method of the first aspect of the present invention, the user equipment selects the first sidestream communication time-frequency resource for the one transmission opportunity at least according to the first sidestream communication time-frequency resource being in an active period of SL DRX; and/or the user equipment selects the second sidestream communication time-frequency resource, at least so that the selected second sidestream communication time-frequency resource is located after the first sidestream communication time-frequency resource in a time domain.

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 beneficial effects of the invention are that

In NR sidestream communication enhancement, when a sending user equipment selects sidestream communication resources for sidestream communication transmission to a target user equipment for target user equipment (Destination) configured with sidestream communication discontinuous reception SL DRX, the method of the invention ensures that the initial transmission resources of the transmission are in the active period of the SL DRX of the target user equipment, so that the target user equipment can effectively receive the sidestream communication transmission, and the reliability of sidestream communication is improved; meanwhile, the energy consumption of the target user equipment can be reduced.

Drawings

The foregoing and other features of the invention 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 the basic procedure of the method performed by the user equipment in the first, second and third embodiments 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 drawings 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 techniques, which are not directly related to the present invention, are omitted to prevent confusion of the understanding of the present invention.

Various embodiments in accordance with the present invention 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 invention 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 invention are described below, and unless otherwise specified, the terms related to the present invention are defined herein. The terms given in the present invention may be named differently in LTE, LTE-Advanced Pro, NR and subsequent communication systems, but the present invention 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

SIB: system Information Block System information block

SIB1: system 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: system 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

PDU: protocol Data Unit protocol data unit

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 invention 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 mode 2 represents a transmission mode (resource allocation scheme) based on user equipment awareness (sensing) and resource selection.

The PSCCH in the description of the invention is used to carry SCI. The PSCCH referred to in the description of this invention 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.

Parameter set (numerology) in NR (including NR sidelink) 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 detailed 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. 15kHz x 2 for subcarrier spacing ^μ The resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

Sidelink communication scenario

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) PSSCH occupies one time domainThe subframes, and the corresponding PSCCHs, are Frequency Division Multiplexed (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 mode 2 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 perception

For the perceived resource allocation (resource allocation 2), the sidelink communication ue selects candidate resources within a time window (optionally, resource selection windows [ n+t1, n+t2 ]), determines candidate resources overlapping with the reserved resources according to reserved resources indicated by PSCCH sent by other ues in the listening 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). One selected sidelink grant contains sidelink communication resources that can be used for the initial transmission and all retransmissions of one MAC PDU (corresponding to one transport block TB) or for the initial transmission and all retransmissions of multiple MAC PDUs (corresponding to multiple transport blocks TBs). The present invention is not limited in this regard.

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 Window List of a resource selection window, wherein 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≤remaininThe choice of g PDB, 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 of the value of (2)

Lateral communication discontinuous reception SL DRX

In 5G NR communication, the ue supports discontinuous reception of the PDCCH, called DRX, in time, which can effectively reduce power consumption of the communication device. Similarly, corresponding to SL DRX, discontinuous reception refers to listening for sidestream communication control information SCI (including SCI level 1 and SCI level 2) for a portion of the time in the time domain, which is referred to as the Active period (Active time).

In the sidestream communication, for unicast (unicasting), the sending ue configures relevant configuration information of SL DRX for the receiving ue through a sidestream communication RRC signaling (PC 5 RRC); for multicast (groupcast) and broadcast (broadcast), the base station configures relevant configuration information of SL DRX for the sidestream communication user equipment through a broadcast message (SIB) in case of coverage of the base station.

Layer 2 identification (Layer-2 ID) and Layer 1 identification (Layer-1 ID) in sidestream communications

In sidestream communications, the layer 2 identifications include a Source layer 2 identification (Source layer-2 ID) and a target layer 2 identification (Destination layer-2 ID). The source layer 2 identity and the target layer 2 identity are both 24 bits. The layer 1 identity includes a Source layer 1 identity (Source layer-1 ID) and a target layer 1 identity (Destination layer-1 ID). Wherein, the source layer 1 mark represents the last 8 bits (the first bit of the left number is the first bit) of the source layer 2 mark; target layer 1 identification represents the last 16 bits of target layer 2 identification. Both the source layer 1 identity and the target layer 1 identity are carried in the secondary SCI. The first 16 bits of the source layer 2 identifier and the first 8 bits of the target layer 2 identifier are in the sub-header (MAC PDU sub-header) of the MAC PDU corresponding to the secondary SCi.

Resource selection (or reselection) check (check)

In sidestream communication, mechanisms are supported to check selected sidestream communication resources. For example, when the configuration information of the resource pool of the sidestream communication is reconfigured, the result of the resource selection (reselection) check is to trigger the user equipment to perform a resource selection (or reselection) procedure. The result of the (re) selection check is triggering the user equipment to perform a resource selection (or reselection) procedure including, but not limited to, the reconfiguration of the resource pool configuration information described above.

Specific examples, embodiments, and the like according to the present invention 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 invention, and are not intended to limit the present invention.

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 invention.

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

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

in step S101, the sidestream communication user device selects to generate a selected sidestream communication scheduling grant (selected sidelink grant), and optionally, sidestream communication data is available on the logical channel.

Wherein, optionally, the one selected sidestream communication scheduling grant corresponds to transmission of one or more MAC protocol data units, PDUs.

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

Wherein, optionally, if the result of the resource selection (or reselection) check is triggering a resource selection (or reselection), the user equipment performs a transmit resource selection (or reselection) procedure.

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

Wherein, optionally, if side-by-side communication discontinuous reception SL DRX is configured (activated, or enabled), or, optionally, if (the MAC PDU corresponds (or is associated with)) target (Destination) is configured (activated, or enabled), or, optionally, for unicast transmission, if (the MAC PDU corresponds (or is associated with)) a pair of source layer 1 (or layer 2) identification and target layer 1 (or layer 2) identification are configured (activated, or enabled), for multicast and broadcast transmission, if (the MAC PDU corresponds (or is associated with)) target layer 1 (or layer 2) identification is configured (activated, or enabled), then,

The user equipment selects (randomly) side-by-side communication time-frequency resources r for one transmission opportunity (one transmission opportunity) _i At least according to: the side communication time-frequency resource r _i During the active period (active time) of the SL DRX, and/or,

if the user equipment selects one or more HARQ retransmissions, the user equipment usesThe ue selects (randomly) a sidelink communication time-frequency resource from the available (available) sidelink communication resources for the one or more transmission opportunities, at least such that: the selected side-by-side communication time-frequency resource and/or the r _i The earliest resource in the time domain in the SL DRX active period.

In step S103, the ue determines the earliest transmission opportunity in the time domain among all the selected transmission opportunities as an initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.

Example two

Next, a method performed by the user equipment according to the second embodiment of the present invention will be described in detail with reference to the basic process diagram shown in fig. 3.

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

in step S101, the sidestream communication user device selects to generate (select to create) a selected sidestream communication scheduling grant (selected sidelink grant), and optionally, sidestream communication data is available on the logical channel.

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

if the user equipment selects one or more HARQ retransmissions, the user equipment selects (randomly) sidelink communication time-frequency resources from among available (available) sidelink communication resources for the one or more transmission opportunities, at least such that: the selected side-by-side communication time-frequency resource and/or the r _i The earliest resource in the time domain in the SL DRX active period.

Example III

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

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

Wherein, optionally, if side-communication discontinuous reception, SL, DRX, is configured (activated, or enabled), or, optionally, if the Destination (Destination) corresponding (or associated) to the MAC PDU is configured (activated, or enabled), or, optionally, for unicast transmission, if a pair of source layer 1 (or layer 2) and Destination layer 1 (or layer 2) identification(s) are configured (activated, or enabled), for multicast and broadcast transmission, if the Destination layer 1 (or layer 2) corresponding (or associated) to the MAC PDU is configured (activated, or enabled),

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

if the user equipment selects one or more HARQ retransmissions, the user equipment selects (randomly) sidelink communication time-frequency resources from among available (available) sidelink communication resources for the one or more transmission opportunities, at least such that: the selected side communication time-frequency resource is located in the r in the time domain _i After that, the process is performed.

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 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 invention, described in detail by a user equipment.

The method and the apparatus involved of the present invention 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 invention 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 invention 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 invention 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 this application, the "base station" may refer to a mobile communication data and control switching center with a larger transmission power and a wider coverage area, including functions of resource allocation scheduling, data receiving and transmitting, and the like. "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 invention 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 invention. 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 invention. Such an arrangement of the present invention 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 invention.

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 invention can also use integrated circuits obtained using the advanced technologies.

While the invention 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 invention. Accordingly, the invention 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:

selecting and generating a selected sidestream communication scheduling license;

performing transmission resource selection or reselection; and

and determining the earliest transmission opportunity in the time domain in all the selected or reselected transmission opportunities as an initial transmission opportunity, and retransmitting the other transmission opportunities.

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

on the logical channel, sidestream communication data is available.

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

the one selected sidelink communication scheduling grant corresponds to transmission of a plurality of or one media access control layer protocol data unit MAC PDU.

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

and if the checking result of the resource selection or reselection is triggering the resource selection or reselection, executing the transmission resource selection or reselection.

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

the resource allocation mode of the user equipment is as follows:

based on the perceived resource allocation; or alternatively

Based on the partially perceived resource allocation mode; or alternatively

And (5) random resource selection.

6. The method of claim 3, wherein the step of,

if the SL DRX is configured or activated or enabled for discontinuous reception of the sidestream communication, or if the SL DRX is configured or activated or enabled for the corresponding or associated target of the MAC PDU, the user equipment selects a first sidestream communication time-frequency resource for one transmission opportunity; and/or

And if one or more HARQ retransmissions are selected, the user equipment selects a second sidestream communication time-frequency resource from the available sidestream communication resources for the one or more transmission opportunities.

7. The method of claim 6, wherein the step of providing the first layer comprises,

the user equipment selects the first sidestream communication time-frequency resource for the primary transmission opportunity at least according to the first sidestream communication time-frequency resource in the active period of SL DRX; and/or

And the user equipment selects the second sidestream communication time-frequency resource, and at least the selected second sidestream communication time-frequency resource and/or the earliest time-domain resource in the first sidestream communication time-frequency resource is in the active period of the SL DRX.

8. The method of claim 6, wherein the step of providing the first layer comprises,

if the user equipment does not select HARQ retransmission, selecting the first sidestream communication time-frequency resource for the one transmission opportunity at least according to the first sidestream communication time-frequency resource in the active period of SL DRX; and/or

9. The method of claim 6, wherein the step of providing the first layer comprises,

The user equipment selects the second sidestream communication time-frequency resource, at least so that the selected second sidestream communication time-frequency resource is located after the first sidestream communication time-frequency resource in the time domain.

10. 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 9.