Method performed by user equipment and user equipment

Abstract

The present invention provides a method executed by a user equipment and the user equipment, the method comprising: a MAC entity of the user equipment receives configuration information of an upper layer, and the upper layer configures the MAC entity as a perception-based side communication transmission; the user equipment selects time domain and frequency domain resources for a first transmission opportunity; and the user equipment selects time domain and frequency domain resources for a second transmission opportunity.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a method executed by a user equipment and corresponding user equipment. Background Art

[0002] In traditional cellular networks, all communications must go through base stations. In contrast, D2D communication (Device-to-Device communication) refers to the direct communication between two user devices without forwarding through a base station or core network. At the RAN#63 plenary meeting of the 3rd Generation Partnership Project (3GPP) in March 2014, a research project on using LTE devices to implement proximity D2D communication services was approved (see non-patent document 1). The features introduced by LTE Release 12 D2D include:

[0003] 1) Discovery function between nearby devices in LTE network coverage scenarios;

[0004] 2) Direct broadcast communication (Broadcast) function between adjacent devices;

[0005] 3) The upper layer supports unicast and multicast communication functions.

[0006] At the 3GPP RAN#66 plenary meeting in December 2014, the research project of enhanced LTE eD2D was approved (see non-patent document 2). The main functions introduced by LTE Release 13 eD2D include:

[0007] 1) D2D discovery in scenarios with no network coverage and partial network coverage;

[0008] 2) Priority handling mechanism for D2D communication.

[0009] Based on the design of D2D communication mechanism, the feasibility study of V2X based on D2D communication was approved at the RAN#68 plenary meeting of 3GPP in June 2015. V2X stands for Vehicle to Everything, which hopes to achieve information exchange between vehicles and all entities that may affect vehicles, with the aim of reducing accidents, easing traffic congestion, reducing environmental pollution and providing other information services. The application scenarios of V2X mainly include four aspects:

[0010] 1) V2V, Vehicle to Vehicle, i.e. vehicle-to-vehicle communication;

[0011] 2) V2P, Vehicle to Pedestrian, that is, the vehicle sends warnings to pedestrians or non-motor vehicles;

[0012] 3) V2N, Vehicle to Network, that is, vehicles connected to mobile networks;

[0013] 4) V2I, Vehicle to Infrastructure, refers to the communication between vehicles and road infrastructure.

[0014] 3GPP divides the research and standardization of V2X into three stages. The first stage was completed in September 2016, focusing mainly on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink communication), that is, proximity communication technology (see non-patent document 3). V2X stage 1 introduced a new D2D communication interface called the PC5 interface. The PC5 interface is mainly used to solve the communication problems of cellular vehicle networks in high-speed (up to 250 km / h) and high-node density environments. Vehicles can exchange information such as location, speed and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14V2X mainly include:

[0015] 1) Higher density DMRS to support high-speed scenarios;

[0016] 2) Introducing sub-channels to enhance resource allocation;

[0017] 3) Introduce a user equipment sensing mechanism with semi-persistent scheduling.

[0018] The second phase of the V2X research project falls within the scope of LTE Release 15 research (see non-patent document 4). The main features introduced include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and feasibility study of transmit diversity.

[0019] At the 3GPP RAN#80 plenary meeting in June 2018, the corresponding third phase V2X feasibility study project based on 5G NR network technology (see non-patent document 5) was approved.

[0020] In the LTE Release 14 V2X topic, a resource allocation mode 4 based on user equipment sensing is supported, or transmission mode 4. In resource allocation mode 4, the physical layer of the user equipment senses the transmission resources in the resource pool and reports the set of available transmission resources to the upper layer. After receiving the report from the physical layer, the upper layer selects specific resources for sideline communication transmission.

[0021] The solution of this patent mainly includes a method for a user equipment to select resources for sideline communication transmission in LTE V2X.

[0022] At the same time, in the standardization research of NR sideline communication, similar to LTE V2X, a resource allocation method based on user equipment perception is also introduced, called resource allocation method 2. In resource allocation method 2, the physical layer of the user equipment perceives the transmission resources in the resource pool and reports the set of available transmission resources to the upper layer. After obtaining the report from the physical layer, the upper layer selects specific resources for sideline communication transmission.

[0023] The solution of this patent also includes a method for a user equipment to select resources for sideline communication transmission in NR sideline communication.

[0024] Prior art literature

[0025] Non-patent literature

[0026] Non-patent literature 1: RP-140518, Work item proposal on LTE Device to DeviceProximity Services

[0027] Non-Patent Literature 2: RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services

[0028] Non-patent document 3: RP-152293, New WI proposal: Support for V2V services based on LTE sidelink

[0029] Non-patent document 4: RP-170798, New WID on 3GPP V2X Phase 2

[0030] Non-Patent Literature 5: RP-181480, New SID Proposal: Study on NR V2X Summary of the invention

[0031] In order to solve at least a part of the above problems, the present invention provides a method performed by a user equipment and the user equipment.

[0032] According to a first aspect of the present invention, there is provided a method performed by a user equipment, comprising the following steps:

[0033] The MAC entity of the user equipment receives configuration information from an upper layer, and is configured by the upper layer to perform sideline communication transmission based on perception;

[0034] The user equipment selects time domain and frequency domain resources for a first transmission opportunity;

[0035] The user equipment selects time domain and frequency domain resources for the second transmission opportunity.

[0036] In the above method performed by the user equipment, optionally, the user equipment is an LTE sideline communication user equipment.

[0037] In the above-mentioned method performed by the user equipment, optionally, the user equipment is an NR sideline communication user equipment.

[0038] In the above method performed by the user equipment, optionally, the user equipment randomly selects time domain and frequency domain resources of the first transmission opportunity from resources indicated by the physical layer of the user equipment.

[0039] In the above method performed by the user equipment, optionally, the time domain and frequency domain resources of the second transmission opportunity correspond to the time domain and frequency domain resources of HARQ retransmission; and,

[0040] The second transmission opportunity includes one or more than one transmission opportunity.

[0041] In the above method performed by the user equipment, optionally, if the number of HARQ retransmissions is equal to 1, among the resources indicated by the physical layer of the user equipment, there are remaining resources available for more transmission opportunities, and the remaining available resources meet the following conditions:

[0042] When the user equipment selects a subframe set j=0, 1, ..., as the time domain resource of the first transmission opportunity; the time domain resource subframe set of the second transmission opportunity j=0,1,...,and satisfy -15≤k≤15,and k≠0,and at the same time,satisfy mod(|k|,P′ rsvp_TX )≠0, then

[0043] The user equipment randomly selects time domain and frequency domain resources of the second transmission opportunity.

[0044] In the above method performed by the user equipment, optionally, if the number of HARQ retransmissions is equal to 1 or greater than 1, and there are resources remaining in the resources indicated by the physical layer of the user equipment that are available for more transmission opportunities, then

[0045] The user equipment randomly selects time domain and frequency domain resources of the second transmission opportunity.

[0046] In the above method performed by the user equipment, optionally, the user equipment uses the time domain and frequency domain resources of the first transmission opportunity to select a first periodic side communication resource according to the resource reservation interval, where the first periodic side communication resource is an initial transmission opportunity,

[0047] The user equipment uses the time domain and frequency domain resources of the second transmission opportunity and selects a second periodic sideline communication resource according to the resource reservation interval, where the second periodic sideline communication resource is a retransmission opportunity.

[0048] In the above method performed by the user equipment, optionally, the first periodic sideline communication resource and the second periodic sideline communication resource do not overlap; or,

[0049] The sideline communication resources of the retransmission opportunity do not overlap with the sideline communication resources of the initial transmission opportunity.

[0050] According to a second aspect of the present invention, there is provided a user equipment, comprising:

[0051] Processor; and

[0052] Memory, which stores instructions,

[0053] When the instructions are executed by the processor, the user equipment is caused to perform the method described above.

[0054] Beneficial effects of the present invention

[0055] According to the solution of this patent, in LTE V2X sideline communication, it can be effectively guaranteed that the user equipment will not select more than one sideline communication resource in the same subframe, and the single carrier characteristics (SC-FDMA) in LTE transmission are guaranteed, transmission interference is reduced, and transmission reliability is improved.

[0056] Similarly, according to the solution of this patent, in NR sideline communication, it can be effectively ensured that the user equipment will not select more than one sideline communication resource in the same time slot, and it can be ensured that different sideline communication transmissions of the NR sideline communication user equipment will not overlap in the time domain. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and other features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0058] Figure 1 is a schematic diagram showing LTE V2X UE sideline communication.

[0059] Figure 2 is a schematic diagram showing the resource allocation method of LTE V2X.

[0060] Figure 3 It is a schematic diagram showing the basic process of the method executed by the user equipment in the first and third embodiments of the invention.

[0061] Figure 4 It is a schematic diagram showing the basic process of the method executed by the user equipment in the second embodiment of the invention.

[0062] Figure 5 is a block diagram illustrating a user equipment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of known technologies that are not directly related to the present invention are omitted to prevent confusion in understanding the present invention.

[0064] The following uses the 5G mobile communication system and its subsequent evolution versions as example application environments to specifically describe multiple embodiments of the present invention. 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 communication systems after 5G and 4G mobile communication systems before 5G.

[0065] The following describes some of the terms involved in the present invention. Unless otherwise specified, the terms involved in the present invention are defined herein. The terms given in the present invention may be named differently in LTE, LTE-Advanced, LTE-Advanced Pro, NR and subsequent communication systems, but unified terms are used in the present invention, and when applied to a specific system, they can be replaced by the terms used in the corresponding system.

[0066] 3GPP: 3rd Generation Partnership Project

[0067] LTE: Long Term Evolution

[0068] NR: New Radio

[0069] PDCCH: Physical Downlink Control Channel, physical downlink control channel

[0070] DCI: Downlink Control Information, downlink control information

[0071] PDSCH: Physical Downlink Shared Channel, physical downlink shared channel

[0072] UE:User Equipment

[0073] eNB: evolved NodeB

[0074] gNB: NR base station

[0075] TTI: Transmission Time Interval, transmission time interval

[0076] OFDM: Orthogonal Frequency Division Multiplexing

[0077] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing with cyclic prefix

[0078] C-RNTI: Cell Radio Network Temporary Identifier, cell radio network temporary identifier

[0079] CSI: Channel State Information

[0080] HARQ: Hybrid Automatic Repeat Request

[0081] CSI-RS: Channel State Information Reference Signal, channel state information reference signal

[0082] CRS: Cell Reference Signal, cell-specific reference signal

[0083] PUCCH: Physical Uplink Control Channel, physical uplink control channel

[0084] PUSCH: Physical Uplink Shared Channel, physical uplink shared channel

[0085] UL-SCH: Uplink Shared Channel, uplink shared channel

[0086] CG: Configured Grant, configuration scheduling permission

[0087] Sidelink: Sidelink communication

[0088] SCI: Sidelink Control Information, sidelink communication control information

[0089] PSCCH: Physical Sidelink Control Channel, physical sidelink communication control channel

[0090] MCS: Modulation and Coding Scheme, modulation and coding scheme

[0091] RB: Resource Block

[0092] RE:Resource Element

[0093] CRB: Common Resource Block

[0094] CP: Cyclic Prefix

[0095] PRB: Physical Resource Block, physical resource block

[0096] PSSCH: Physical Sidelink Shared Channel, physical sidelink communication shared channel

[0097] FDM: Frequency Division Multiplexing

[0098] RRC: Radio Resource Control

[0099] RSRP: Reference Signal Receiving Power, reference signal receiving power

[0100] SRS: Sounding Reference Signal, detection reference signal

[0101] DMRS: Demodulation Reference Signal

[0102] CRC: Cyclic Redundancy Check

[0103] PSDCH: Physical Sidelink Discovery Channel, physical sidelink communication discovery channel

[0104] PSBCH: Physical Sidelink Broadcast Channel, physical sidelink communication broadcast channel

[0105] SFI: Slot Format Indication, slot format indication

[0106] TDD: Time Division Duplexing

[0107] FDD: Frequency Division Duplexing

[0108] SIB1: System Information Block Type 1, system information block type 1

[0109] SLSS: Sidelink synchronization Signal, sidelink communication synchronization signal

[0110] PSSS: Primary Sidelink Synchronization Signal, primary synchronization signal for sidelink communication

[0111] SSSS: Secondary Sidelink Synchronization Signal, sideline communication auxiliary synchronization signal

[0112] PCI: Physical Cell ID, physical cell identifier

[0113] PSS: Primary Synchronization Signal

[0114] SSS: Secondary Synchronization Signal, auxiliary synchronization signal

[0115] BWP: BandWidth Part, bandwidth fragment / part

[0116] GNSS: Global Navigation Satellite System

[0117] SFN: System Frame Number, system (wireless) frame number

[0118] DFN: Direct Frame Number, direct frame number

[0119] IE: Information Element

[0120] SSB: Synchronization Signal Block, synchronization system information block

[0121] EN-DC: EUTRA-NR Dual Connection, LTE-NR dual connection

[0122] MCG: Master Cell Group

[0123] SCG: Secondary Cell Group

[0124] PCell: Primary Cell

[0125] SCell: Secondary Cell

[0126] PSFCH: Physical Sidelink Feedback Channel, physical sidelink communication feedback channel

[0127] SPS: Semi-Persistant Scheduling

[0128] TA: Timing Advance, uplink timing advance

[0129] PT-RS: Phase-Tracking Reference Signals, phase tracking reference signal

[0130] TB: Transport Block

[0131] CB: Code Block, coding block / code block

[0132] QPSK: Quadrature Phase Shift Keying, orthogonal phase shift keying

[0133] 16 / 64 / 256 QAM: 16 / 64 / 256 Quadrature Amplitude Modulation, quadrature amplitude modulation

[0134] AGC: Auto Gain Control, automatic gain control

[0135] TDRA (field): Time Domain Resource Assignment, time domain resource allocation indication (field)

[0136] FDRA(field): Frequency Domain Resource Assignment, frequency domain resource allocation indication (field)

[0137] ARFCN: Absolute Radio Frequency Channel Number, absolute radio frequency channel number

[0138] SC-FDMA: Single Carrier-Frequency Division Multiple Access

[0139] The following is a description of the prior art associated with the solution of the present invention. Unless otherwise specified, the meanings of the same terms in the specific embodiments and the prior art are the same.

[0140] It is worth pointing out that V2X and sidelink mentioned in the specification of the present invention have the same meaning. V2X in the text can also represent sidelink; similarly, sidelink in the text can also represent V2X, and no specific distinction or limitation will be made in the following text.

[0141] The resource allocation method of V2X (sidelink) communication in the specification of the present invention can be equivalently replaced with the transmission mode of V2X (sidelink) communication. The resource allocation method involved in the specification can represent the transmission mode, and the transmission mode involved can represent the resource allocation method. In NR side communication, transmission mode 1 represents a transmission mode (resource allocation method) based on base station scheduling; transmission mode 2 represents a transmission mode (resource allocation method) based on user equipment sensing and resource selection.

[0142] The PSCCH in the specification of the present invention is used to carry SCI. The PSCCH corresponding to, or corresponding to, or related to, or scheduled PSSCH involved in the specification of the present invention have the same meaning, all representing associated PSSCH or corresponding PSSCH. Similarly, the SCI (including first-level SCI and second-level SCI) corresponding to, or corresponding to, or related to PSSCH involved in the specification have the same meaning, all representing associated SCI or corresponding SCI. It is worth noting that the first-level SCI is called 1st stage SCI or SCI format 0-1, which is transmitted in PSCCH; the second-level SCI is called 2nd stage SCI or SCI format 0-2, which is transmitted in the corresponding PSSCH resources.

[0143] Sidelink communication scenarios

[0144] 1) Out-of-Coverage sidelink communication: Both UEs performing sidelink communication have no network coverage (for example, the UE cannot detect any cell that meets the "cell selection criteria" on the frequency required for sidelink communication, indicating that the UE has no network coverage).

[0145] 2) Sidelink communication with network coverage (In-Coverage): Both UEs performing sidelink communication have network coverage (for example, the UE detects at least one cell that meets the "cell selection criteria" on the frequency required for sidelink communication, indicating that the UE has network coverage).

[0146] 3) Partial-Coverage sidelink communication: One of the UEs performing sidelink communication has no network coverage, while the other UE has network coverage.

[0147] From the UE side, the UE has only two scenarios: no network coverage and network coverage. Partial network coverage is described from the perspective of sidelink communication.

[0148] Basic process of LTE V2X (sidelink) communication

[0149] Figure 1 It is a schematic diagram showing the LTE V2X UE side communication. First, UE1 sends side communication control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH. SCI format 1 contains scheduling information of PSSCH, such as frequency domain resources of PSSCH. Secondly, UE1 sends side communication data to UE2, which is carried by the physical layer channel PSSCH. PSCCH and the corresponding PSSCH are frequency-division multiplexed, that is, PSCCH and the corresponding PSSCH are located in the same subframe in the time domain and in different RBs in the frequency domain. In LTE V2X, a transport block TB may contain only one initial transmission, or one initial transmission and one blind retransmission (blind retransmission, indicating retransmission not based on HARQ feedback).

[0150] The specific design of PSCCH and PSSCH is as follows:

[0151] 1)PSCCH occupies one subframe in the time domain and two consecutive RBs in the frequency domain. The scrambling sequence is initialized using a predefined value of 510. PSCCH can carry SCI format 1, where SCI format 1 contains at least the frequency domain resource information of PSSCH. For example, for the frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the PSSCH corresponding to the PSCCH.

[0152] 2) PSSCH occupies one subframe in the time domain and uses frequency division multiplexing (FDM) with the corresponding PSCCH. PSSCH occupies one or more consecutive sub-channels in the frequency domain. Sub-channel represents n in the frequency domain. subCHsize consecutive RBs, n subCHsize Configured by RRC parameters, the number of starting sub-channel and consecutive sub-channels is indicated by the frequency domain resource indication field of SCI format1.

[0153] LTE V2X resource allocation method Transmission Mode 3 / 4

[0154] Figure 2It shows two resource allocation modes of LTE V2X, which are called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (Transmission Mode 4). In NR side communication, the transmission mode 3 of LTE V2X corresponds to the transmission mode 1 in NR V2X, which 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, which is a transmission mode based on UE sensing. In LTE V2X, when there is eNB network coverage, the base station can configure the resource allocation mode of the UE, or the transmission mode of the UE, through the dedicated RRC signaling (dedicated RRCsignaling) SL-V2X-ConfigDedicated at the UE level, which is specifically:

[0155] 1) Resource allocation based on base station scheduling (Transmission Mode 3): The resource allocation based on base station scheduling means that the frequency domain resources used for sidelink communication come from the scheduling of the base station. Transmission mode 3 includes two scheduling modes, namely dynamic scheduling and semi-static scheduling (SPS). For dynamic scheduling, the UL grant (DCI format 5A) includes the frequency domain resources of PSSCH, and the CRC of the PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-V-RNTI. For SPS semi-static scheduling, the base station configures one or more (up to 8) configured scheduling grants (configured grant) through IE: SPS-ConfigSL-r14. Each configured scheduling grant contains a scheduling grant number (index) and the resource period of the scheduling grant. The UL grant (DCI format 5A) includes the frequency domain resources of PSSCH, as well as the indication information (3 bits) of the scheduling grant number and the indication information of SPS activation (activate) or release (release, or, deactivation). The CRC of the PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-SPS-V-RNTI.

[0156] Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it means that the UE is configured as 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 an uplink scheduling grant UL grant to the UE through PDCCH or EPDCCH (DCI format 5A, CRC is encrypted with SL-V-RNTI or SL-SPS-V-RNTI). The above-mentioned uplink scheduling grant UL grant contains at least the scheduling information of the PSSCH frequency domain resources in the sidelink communication. When the UE successfully monitors the PDCCH or EPDCCH encrypted by SL-V-RNTI or SL-SPS-V-RNTI, the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant (DCI format 5A) is used as the indication information of the frequency domain resources of the PSSCH in the PSCCH (SCI format 1), and the PSCCH (SCIformat 1) and the corresponding PSSCH are sent.

[0157] For semi-persistent scheduling SPS in transmission mode 3, the UE receives DCI format 5A scrambled by SL-SPS-V-RNTI in downlink subframe n. If DCI format 5A contains indication information of SPS activation, the UE determines the frequency domain resources of PSSCH according to the indication information in DCI format 5A, and determines the time domain resources of PSSCH (transmission subframe of PSSCH) according to information such as subframe n.

[0158] 2) Resource allocation based on UE sensing (Transmission Mode 4): The resource allocation based on UE sensing means that the resources used for sidelink communication are based on the UE's sensing process of the candidate available resource set. When the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-r14, it means that the UE is configured for a transmission mode based on UE sensing. In the transmission mode based on UE sensing, the base station configures the available transmission resource pool, and the UE determines the sidelink transmission resources of the PSSCH in the transmission resource pool according to certain rules (for a detailed description of the process, see the LTE V2X UE sensing process section), and sends the PSCCH (SCI format 1) and the corresponding PSSCH.

[0159] Sidelink resource pool (sidelink resource Dool)

[0160] In sidelink communication, the resources sent and received by the UE belong to the resource pool. For example, for a transmission mode based on base station scheduling in sidelink communication, the base station schedules transmission resources for the sidelink UE in the resource pool, or, for a transmission mode based on UE perception in sidelink communication, the UE determines the transmission resources in the resource pool.

[0161] Parameter set (numerology) in NR (including NR sidelink) and NR (including NR sidelink Slot

[0162] The parameter set numerology includes two meanings: subcarrier spacing and cyclic prefix CP length. Among them, NR supports 5 subcarrier spacings, namely 15k, 30k, 60k, 120k, and 240kHz (corresponding to μ=0, 1, 2, 3, and 4). Table 4.2-1 shows the supported transmission parameter sets, as shown below.

[0163] Table 4.2-1 Subcarrier spacing supported by NR

[0164] μ <![CDATA[Δf=2 μ ·15[kHz]]]> CP (Cyclic Prefix) 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0165] Only when μ=2, that is, when the subcarrier spacing is 60kHz, the Extended CP is supported. For other subcarrier spacings, only the Normal CP is supported. For the Normal CP, each slot contains 14 OFDM symbols; for the Extended CP, each slot contains 12 OFDM symbols. For μ=0, that is, 15kHz subcarrier spacing, 1 slot = 1ms; μ=1, that is, 30kHz subcarrier spacing, 1 slot = 0.5ms; μ=2, that is, 60kHz subcarrier spacing, 1 slot = 0.25ms, and so on.

[0166] NR and LTE have the same definition of subframe, which means 1ms. For the subcarrier spacing configuration μ, the slot number within 1 subframe (1ms) can be expressed as The range is 0 to The slot number within a system frame (frame, duration 10ms) can be expressed as The range is 0 to in, and The definitions of different subcarrier spacings μ are shown in the following table.

[0167] Table 4.3.2-1: Number of symbols in each slot, number of slots in each system frame, number of slots in each subframe under normal CP

[0168]

[0169] Table 4.3.2-2: Number of symbols in each slot, number of slots in each system frame, number of slots in each subframe when using extended CP (60kHz)

[0170]

[0171] On the NR carrier, the system frame (or, simply referred to as frame) number SFN ranges from 0 to 1023. The concept of direct system frame number DFN is introduced in sidelink communication, and the number range is also 0 to 1023. The above description of the relationship between system frames and numerology can also be applied to direct system frames. For example, the duration of a direct system frame is also equal to 10ms. For a subcarrier spacing of 15kHz, a direct system frame includes 10 time slots, and so on. DFN is applied to timing on the sidelink carrier.

[0172] Parameter sets in LTE (including LTE V2X) and time slots and subframes in LTE (including LTE V2X)

[0173] LTE only supports a subcarrier spacing of 15kHz. LTE supports both extended CP and normal CP. The subframe duration is 1ms, consisting of two slots, each of which is 0.5ms long.

[0174] For a normal CP, each subframe contains 14 OFDM symbols, and each slot in the subframe contains 7 OFDM symbols; for an extended CP, each subframe contains 12 OFDM symbols, and each slot in the subframe contains 6 OFDM symbols.

[0175] Resource Block RB and Resource Unit RE

[0176] Resource blocks RB are defined in the frequency domain as For example, for a subcarrier spacing of 15kHz, the RB is 180kHz in the frequency domain. μ , the resource unit RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

[0177] Method for LTE V2X UE to determine PSSCH subframe resource pool

[0178] In LTE V2X, the method for determining the subframe resource pool is based on all subframes in the range of SFN#0-SFN#1023, totaling 10240 subframes. Here, the subframe set that may belong to the subframe resource pool for V2X UE to send PSSCH is represented as satisfy:

[0179] 1)

[0180] 2) The subframes in the above subframe set are numbered relative to subframe #0 of SFN #0 or DFN #0, that is, The subframe corresponds to subframe #0 of SFN #0 or DFN #0,

[0181] 3) The above subframe set includes all subframes except the following subframes (subframes included in a, b, and c):

[0182] a) The number of subframes configured with SLSS is represented by N SLSS ;

[0183] b) Downlink subframes and special subframes in the TDD cell, the number is represented by N dssf ;

[0184] c) reserved subframes, where the reserved subframes are determined as follows:

[0185] All subframes with subframe numbers 0-10239 except N SLSS and N dssf After subframes, the remaining (10240-N SLSS -N dssf ) subframes are arranged in ascending order of subframe numbers, which can be expressed as r = floor (m · (10240-N SLSS -N dssf ) / N reserved ). Where m = 0, 1, ..., N reserved -1, and N reserved =(10240-N SLSS -N dssf )mod L bitmap .L bitmap The length of the bitmap representing the resource pool configuration is configured by the upper layer. The bitmap can be expressed as Subframe 1 r The subframes with corresponding numbers belong to reserved subframes.

[0186] 4) The subframes in the subframe set are arranged in ascending order of subframe numbers.

[0187] The method for UE to determine the PSSCH subframe resource pool is as follows: for the subframe set Subframes in If b is satisfied k′ = 1, where k′ = k mod L bitmap , then the subframe Belongs to the PSSCH subframe resource pool.

[0188] LTE V2X Transmission Mode 4 Reserved Resources

[0189] In LTE V2X transmission mode 4, when the UE determines the resources for sending sidelink communication through the sensing process, the UE will reserve resources for periodic service data. Assume that the subframe resources for sending PSSCH determined by the UE are represented as subframe Then the UE in the subframe The reserved resources are: resel -1, C resel =10×SL_RESOURGE_RESELEGTION_COUNTER, SL_RESOURGE-RESELECTION_COUNTER is configured by the upper layer. If the upper layer is not configured, C resel =1. rsvp_TX′ =P step ×P rsvp_TX / 100. LTE V2X includes periodic services, and the service generation period is about P serv =100ms. Among them, P step Indicates that in P serv The following table 1 shows the number of uplink subframes available in LTE V2X. step The value of different TDD uplink and downlink configuration information. For example, for TDD UL / DL configuration information 2, each system frame contains 2 uplink subframes. serv =100ms service cycle, including 20 uplink subframes. Table 1 shows the P for edge connection transmission modes 3 and 4. step The details are shown in the following table.

[0190] Table 1 P step Determination

[0191]

[0192] P rsvp_TX Indicates the resource reservation interval indicated by the upper layer.

[0193] LTE V2X UE determines the resource reservation indication field in SCI format1

[0194] The resource reservation interval indicated by the upper layer is denoted as P rsvp_TX UE determines X=P according to the upper layer instruction rsvp_TX By combining the value of / 100 with the following Table 2, the UE can determine the resource reservation indication field (4-bit indication field) in the SCI.

[0195] Table 2

[0196]

[0197] UE sensing process in LTE V2X Transmission Mode 4

[0198] For the UE sensing process, in summary, in LTE V2X transmission mode 4, the upper layer requests sidelink data to be sent in subframe #n, and the UE The UE monitors the SCI format 1 sent by other UEs. According to the successfully decoded SCI format 1, the UE determines the available resources in the candidate resource set between subframe #(n+T1) and subframe #(n+T2), and reports the determined available resources to the upper layer. If subframe #n belongs to the subframe set So otherwise, Indicates the first subframe after subframe #n that belongs to the subframe set subframe. T1 and T2 depend on the specific implementation of UE.

[0199] Each element in the candidate resource set between subframe #(n+T1) and subframe #(n+T2), that is, each candidate resource can be called a candidate single subframe resource (candidate single subframe resource), using R x，y To indicate. x，y The specific definition is:

[0200] 1) x represents continuous L in the frequency domain subCH sub-channel #(x+j), where j=0, 1, ..., L subCH -1.

[0201] 2) y represents the time domain subframe

[0202] UE assumes that between subframe #(n+T1) and subframe #(n+T2), any consecutive L belonging to the PSSCH resource pool subCH Each sub-channel corresponds to a candidate single subframe resource. The candidate resource set uses S A express.

[0203] Note that UE is in subframe The resource reservation indication field in the received SCI format 1 is P rsvp_RX If the UE is in subframe The received SCI format is 1 or the UE assumes that the subframe The PSSCH resource blocks and subframe resources indicated in the same SCI format1 received on the same network are compared with the candidate single subframe resources. When the RSRP is overlapped or partially overlapped (the UE perception process also needs to compare RSRP, which is not described in detail in the present invention), the UE will select the candidate single subframe resource R x，y From S A Exclude. Where q = 1, 2, ..., Q, and j = 1, 2, ..., C resel -1. If P rsvp_RX <1 and n′-m≤P step ×P rsvp_RX , then Q=1 / P rsvp_RX ; otherwise, Q=1.

[0204] According to the method including but not limited to the above, after the UE performs sensing, the UE reports the candidate single subframe resources that have not been removed to higher layers for the upper layers (eg, MAC layer) to select sideline communication resources.

[0205] Hereinafter, specific examples and embodiments of the present invention will be described in detail. As described above, the examples and embodiments described in the present disclosure are provided for easy understanding of the present invention and are not intended to limit the present invention.

[0206] [Example 1]

[0207] Figure 3 It is a schematic diagram showing the basic process of the method executed by the user equipment according to the first embodiment of the present invention.

[0208] Next, combine Figure 3 The basic process diagram shown is used to describe in detail the method executed by the user equipment according to the first embodiment of the present invention.

[0209] like Figure 3 As shown, in the first embodiment of the present invention, the steps performed by the user equipment include:

[0210] In step S101, a MAC entity of a sideline communication user equipment receives configuration information from upper layers and is configured by upper layers for sideline communication transmission based on sensing.

[0211] Optionally, the user equipment is an LTE sideline communication user equipment.

[0212] In step S102, the sideline communication user equipment selects time domain and frequency domain resources for a first transmission opportunity.

[0213] Optionally, the user equipment randomly selects time domain and frequency domain resources for the first transmission opportunity.

[0214] or,

[0215] Optionally, the user equipment selects time domain and frequency domain resources of the first transmission opportunity from perceived resources indicated (or reported) by a physical layer of the user equipment.

[0216] or,

[0217] Optionally, the user equipment randomly selects time domain and frequency domain resources of the first transmission opportunity from perceived resources indicated (or reported) by a physical layer of the user equipment.

[0218] In step S103, the sideline communication user equipment selects time domain and frequency domain resources for a second transmission opportunity.

[0219] Optionally, the time domain and frequency domain resources of the second transmission opportunity correspond to the time domain and frequency domain resources of HARQ retransmission.

[0220] Optionally, the second transmission opportunity includes one or more than one transmission opportunities.

[0221] Optionally, if the number of HARQ retransmissions is equal to 1, optionally, if among the perceived resources indicated (or reported) by the physical layer of the user equipment, (optionally, after the user equipment selects the time domain and frequency domain resources of the first transmission opportunity), there are resources available for more transmission opportunities (for more transmission opportunities) remaining (left), and, optionally, the remaining available resources meet the following condition (meet the condition):

[0222] When the user equipment selects a subframe set j=0, 1, ..., optionally, as the time domain resource of the first transmission opportunity; optionally, the time domain resource subframe set of the second transmission opportunity j=0, 1, ..., and satisfy -15≤k≤15, and k≠0, and optionally, and satisfy |k|≠P′ rsvp_TX (Or, satisfying |k|≠n×P′ rsvp_TX, where n is a positive integer, or |k| is not P′ rsvp_TX A positive integer multiple of, or, mod(|k|, P′ rsvp_TX )≠0(or, mod(k, P′ rsvp_TX )≠0), or |k|<P′ rsvp_TX ).

[0223] The user equipment randomly selects time domain and frequency domain resources for the second transmission opportunity.

[0224] [Example 2]

[0225] Figure 4 It is a schematic diagram showing the basic process of the method executed by the user equipment according to the second embodiment of the present invention.

[0226] Next, combine Figure 4 The basic process diagram shown is used to describe in detail the method executed by the user equipment according to the second embodiment of the present invention.

[0227] like Figure 4 As shown, in the second embodiment of the present invention, the steps performed by the user equipment include:

[0228] In step S201, a MAC entity of a sideline communication user equipment receives configuration information from upper layers and is configured by upper layers for sideline communication transmission based on sensing.

[0229] Optionally, the perception-based side communication transmission is NR side communication resource allocation mode 2.

[0230] Optionally, the user equipment is an NR sideline communication user equipment.

[0231] In step S202, the sideline communication user equipment selects time domain and frequency domain resources of a first transmission opportunity.

[0232] Optionally, the user equipment randomly selects time domain and frequency domain resources for the first transmission opportunity.

[0233] or,

[0234] Optionally, the user equipment selects time domain and frequency domain resources of the first transmission opportunity from perceived resources indicated (or reported) by a physical layer of the user equipment.

[0235] or,

[0236] Optionally, the user equipment randomly selects time domain and frequency domain resources of the first transmission opportunity from perceived resources indicated (or reported) by a physical layer of the user equipment.

[0237] Optionally, the user equipment uses the time domain and frequency domain resources of the first transmission opportunity and selects a first periodic side communication resource according to a resource reservation interval (indicating that the time and frequency resources in each period correspond to the time domain and frequency domain resources of the first transmission opportunity).

[0238] Optionally, the user equipment considers the first periodic side communication resources as new transmission opportunities.

[0239] In step S203, the sideline communication user equipment selects time domain and frequency domain resources of other transmission opportunities.

[0240] Optionally, the time domain and frequency domain resources of the other transmission opportunities correspond to the time domain and frequency domain resources of HARQ retransmission.

[0241] Optionally, the other transmission opportunities include one or more than one transmission opportunities.

[0242] Optionally, if the number of HARQ retransmissions is equal to 1 or more than 1, optionally, if among the perceived resources indicated (or reported) by the physical layer of the user equipment, (optionally, after the user equipment selects the time domain and frequency domain resources of the first transmission opportunity), there are resources available for more transmission opportunities (formore transmission opportunities) remaining (left):

[0243] The user equipment randomly selects time domain and frequency domain resources of the other transmission opportunities.

[0244] Optionally, the user equipment uses the time domain and frequency domain resources of the other transmission opportunities, and selects a second periodic side communication resource according to the resource reservation interval (indicating that the time and frequency resources in each period correspond to the time domain and frequency domain resources of the other transmission opportunities).

[0245] Optionally, the user equipment considers the second periodic sideline communication resources as retransmission opportunities.

[0246] Optionally, the second periodic side communication resources do not overlap (not overlapped); and / or the first periodic side communication resources do not overlap (not overlapped); and / or the first periodic side communication resources and the second periodic side communication resources do not overlap (not overlapped),

[0247] or,

[0248] Optionally, the side communication resources of the retransmission opportunities (corresponding) do not overlap (not overlapped); and / or the side communication resources of the initial transmission opportunities (corresponding) do not overlap (not overlapped); and / or the side communication resources of the retransmission opportunities (corresponding) and the side communication resources of the initial transmission opportunities (corresponding) do not overlap (notoverlapped).

[0249] [Example 3]

[0250] Figure 3 It is a schematic diagram showing the basic process of the method executed by the user equipment according to the third embodiment of the present invention.

[0251] Next, combine Figure 3 The basic process diagram shown is used to describe in detail the method executed by the user equipment in the third embodiment of the present invention.

[0252] like Figure 3 As shown, in the third embodiment of the present invention, the steps performed by the user equipment include:

[0253] In step S101, a MAC entity of a sideline communication user equipment receives configuration information from upper layers and is configured by upper layers for sideline communication transmission based on sensing.

[0254] Optionally, the user equipment is an LTE sideline communication user equipment.

[0255] In step S102, the sideline communication user equipment selects time domain and frequency domain resources of a first transmission opportunity.

[0256] Optionally, the user equipment randomly selects time domain and frequency domain resources for the first transmission opportunity.

[0257] or,

[0258] Optionally, the user equipment selects time domain and frequency domain resources of the first transmission opportunity from perceived resources indicated (or reported) by a physical layer of the user equipment.

[0259] or,

[0260] Optionally, the user equipment randomly selects time domain and frequency domain resources of the first transmission opportunity from perceived resources indicated (or reported) by a physical layer of the user equipment.

[0261] Optionally, the user equipment uses the time domain and frequency domain resources of the first transmission opportunity and selects a first periodic side communication resource according to a resource reservation interval (indicating that the time and frequency resources in each period correspond to the time domain and frequency domain resources of the first transmission opportunity).

[0262] Optionally, the user equipment considers the first periodic side communication resources as new transmission opportunities.

[0263] In step S103, the sideline communication user equipment selects time domain and frequency domain resources for a second transmission opportunity.

[0264] Optionally, the time domain and frequency domain resources of the second transmission opportunity correspond to the time domain and frequency domain resources of HARQ retransmission.

[0265] Optionally, if the number of HARQ retransmissions is equal to 1, optionally, if among the perceived resources indicated (or reported) by the physical layer of the user equipment, (optionally, after the user equipment selects the time domain and frequency domain resources of the first transmission opportunity), there are resources available for more transmission opportunities (for more transmission opportunities) remaining (left); and, optionally, the remaining available resources meet the following condition (meet the condition):

[0266] When the user equipment selects a subframe set j=0, 1, ..., optionally, as the time domain resource of the first transmission opportunity; optionally, the time domain resource subframe set of the second transmission opportunity j=0, 1, . . . , and satisfies -15≤k≤15, and k≠0.

[0267] The user equipment randomly selects time domain and frequency domain resources for the second transmission opportunity.

[0268] Optionally, the user equipment uses the time domain and frequency domain resources of the second transmission opportunity, and selects a second periodic side communication resource according to the resource reservation interval (indicating that the time and frequency resources in each period correspond to the time domain and frequency domain resources of the second transmission opportunity).

[0269] Optionally, the user equipment considers the second periodic sideline communication resources as retransmission opportunities.

[0270] Optionally, the second periodic side communication resources do not overlap (not overlapped); and / or the first periodic side communication resources do not overlap (not overlapped); and / or the first periodic side communication resources and the second periodic side communication resources do not overlap (not overlapped),

[0271] or,

[0272] Optionally, the side communication resources of the retransmission opportunities (corresponding) do not overlap (not overlapped); and / or the side communication resources of the initial transmission opportunities (corresponding) do not overlap (not overlapped); and / or the side communication resources of the retransmission opportunities (corresponding) and the side communication resources of the initial transmission opportunities (corresponding) do not overlap (notoverlapped).

[0273] Figure 5 is a block diagram showing a user equipment UE involved in the present invention. Figure 5 As shown, the user equipment UE80 includes a processor 801 and a memory 802. The processor 801 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 802 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories, etc. The memory 802 stores program instructions. When the instructions are executed by the processor 801, the above method performed by the user equipment described in detail in the present invention may be executed.

[0274] The method of the present invention and the related equipment have been described above in conjunction with the preferred embodiments. Those skilled in the art will appreciate that the method shown above is only exemplary, and the embodiments described above can be combined with each other without contradiction. The method of the present invention is not limited to the steps and sequence shown above. The network node and user equipment shown above may include more modules, for example, modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are only exemplary and not restrictive, and the present invention is not limited to the specific information elements that serve as examples of these identifiers. Those skilled in the art may make many changes and modifications based on the teachings of the illustrated embodiments.

[0275] It should be understood that the above embodiments of the present invention can be implemented by software, hardware, or a combination of software and hardware. For example, the various components inside the base station and user equipment in the above embodiments can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital 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.

[0276] In this application, "base station" may refer to a mobile communication data and control exchange center with a large transmission power and a wide coverage area, including functions such as resource allocation scheduling, data reception and transmission, etc. "User equipment" may refer to a user mobile terminal, such as a mobile phone, a notebook, etc., which can communicate wirelessly with a base station or a micro base station.

[0277] In addition, the embodiments of the present invention disclosed herein can be implemented on a computer program product. More specifically, the computer program product is a product as follows: having a computer-readable medium, on which a computer program logic is encoded, and when executed on a computing device, the computer program logic provides relevant operations to implement the above-mentioned technical solution 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 operation (method) described in the embodiment of the present invention. This 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), a floppy disk or a hard disk, or other media such as firmware or microcode on one or more ROM or RAM or PROM chips, or downloadable software images in one or more modules, shared databases, etc. The software or firmware or such a configuration can be installed on a computing device so that one or more processors in the computing device execute the technical solution described in the embodiment of the present invention.

[0278] In addition, each functional module or each feature of the base station equipment and terminal equipment used in each of the above embodiments can be implemented or executed by a circuit, and the circuit is generally one or more integrated circuits. The circuit 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, a discrete gate or transistor logic, or a discrete hardware component, or any combination of the above devices. The general-purpose processor may be a microprocessor, or the processor may be an existing processor, a controller, a microcontroller or a state machine. The above-mentioned general-purpose processor or each circuit may be configured by a digital circuit, or may be configured by a logic circuit. In addition, when, due to the progress of semiconductor technology, an advanced technology that can replace the current integrated circuit appears, the present invention may also use the integrated circuit obtained by using the advanced technology.

[0279] Although the present invention has been illustrated above in conjunction with the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications, substitutions and changes may be made to the present invention without departing from the spirit and scope of the present invention. Therefore, the present invention should not be limited by the above-described embodiments, but by the appended claims and their equivalents.

Claims

1. A user equipment, comprising: processor; as well as Memory, which stores instructions, When the processor executes the instruction, the user equipment executes the following steps: Determine the first subframe set j = 0, 1, ..., as the first transmission opportunity set, and the second subframe set j=0,1,…, as the second transmission opportunity set, where P' rsvp_TX =P step ×P rsvp_TX / 100,P rsvp_TX is the resource reservation interval indicated by the higher layer, and P step is determined based on the TDD UL / DL configuration, and the second subframe set satisfies the conditions -15≤k≤15, k≠0 and k mod P′ rsvp_TX ≠0, and A physical sidelink shared channel PSSCH is transmitted in one or more subframes in the first subframe set and the second subframe set.

2. A method performed by a user equipment, comprising the following steps: Determine the first subframe set j = 0, 1, ..., as the first transmission opportunity set, and the second subframe set j=0,1,…, as the second transmission opportunity set, where P' rsvp_TX =P step ×P rsvp_TX / 100,P rsvp_TX is the resource reservation interval indicated by the higher layer, and P step is determined based on the TDD UL / DL configuration, and the second subframe set satisfies the conditions -15≤k≤15, k≠0 and k mod P′ rsvp_TX ≠0, and A physical sidelink shared channel PSSCH is transmitted in one or more subframes in the first subframe set and the second subframe set.

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