WO2020088513A1 - Method executed by user equipment, and user equipment - Google Patents

Abstract

The present invention provides a method executed by a user equipment, comprising: obtaining configuration information of a time slot format from another device different from the user equipment; and according to the obtained configuration information of the time slot format, determining a time slot format corresponding to a subcarrier interval configured in a base station or pre-configured in the user equipment.

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 executed by user equipment and a corresponding user equipment.

Background technique

In a traditional cellular network, all communications must go through the base station. The difference is that D2D communication (Device-to-Device communication) refers to a communication method directly performed between two user equipments without being forwarded by a base station or a core network. At the RAN # 63 plenary meeting of the 3rd Generation Partnership Project (3GPP) in March 2014, the research topic on the use of LTE equipment to achieve proximity D2D communication services was approved (see Non-Patent Document 1). The functions introduced by LTE Release 12 D2D include:

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

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

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

At the 3GPP RAN # 66 plenary meeting in December 2014, the enhanced LTE eD2D (enhanced D2D) research project was approved (see Non-Patent Document 2). The main functions introduced by LTE Release 13 eD2D include:

1) D2D discovery without network coverage scenarios and some network coverage scenarios;

2) Priority handling mechanism for D2D communication.

Based on the design of the D2D communication mechanism, at the 3GPP RAN # 68 plenary meeting in June 2015, the V2X feasibility study project based on D2D communication was approved. V2X expresses Vehicle to everything, hoping to realize the interaction between the vehicle and all physical information that may affect the vehicle, the purpose is to reduce accidents, reduce traffic congestion, reduce environmental pollution and provide other information services. V2X mainly includes 4 aspects:

1) V2V, Vehicle to Vehicle, ie vehicle-to-vehicle communication;

2) V2P, Vehicle to Pedestrian, that is, the vehicle sends a warning to pedestrians or non-motor vehicles;

3) V2N, Vehicle to Network, that is, the vehicle is connected to the mobile network;

4) V2I, Vehicle to Infrastructure, that is, communication between vehicles and road infrastructure.

3GPP divides the research and standardization of V2X into three stages. The first phase was completed in September 2016, mainly focusing on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink edge connection), that is, the development of 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 to solve the problem of cellular vehicle networking communication in high-speed (up to 250 km / h) and high node density environments. Vehicles can interact with information such as position, speed, and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface. Compared with D2D proximity communication, the functions introduced by LTE Release 14 V2X mainly include:

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

2) Introduce sub-channel (sub-channel) to enhance resource allocation;

3) Introduce a semi-persistent user equipment sensing mechanism.

The second phase of the V2X research topic belongs to the LTE Release 15 research category (see Non-Patent Document 4). The main features introduced include high-order 64QAM modulation, V2X carrier aggregation, short TTI, and feasibility studies of transmit diversity.

At the 3GPP RAN # 80 plenary meeting in June 2018, the corresponding third-stage V2X feasibility study project based on 5G NR network technology (see Non-Patent Document 5) was approved. The research plan for this topic includes the design of a sidelink synchronization mechanism. The solution of the present invention is mainly directed to a design method in which a physical synchronization channel carries SFI (slot format indication) indication in a sidelink communication based on NR network technology and a method for a user equipment to determine SFI.

The research plan of the NR-based V2X feasibility research project also includes the design goals of supporting physical layer unicast, multicast and broadcast. Unicast means communication between a sending user equipment (UE) and a single receiving user equipment. Multicast means that a group of high-level UEs are assigned the same ID, and UEs communicate within the group. Broadcasting is widely used in scenarios such as base station sending system messages to UEs in a cell in cellular communications. In LTE and NR communications, the communication between the base station and the UE level uses unicast. Take the following data communication as an example, the data channel PDSCH is scrambled by the UE-specific C-RNTI to achieve unicast communication at the physical layer. It is worth noting that in order to improve the reliability of transmission and spectrum efficiency, HARQ retransmission mechanisms are usually included in unicast communication. Release 14/15 LTE V2X currently only supports broadcast communication between UEs, that is, control information and data sent by one UE can be received by one or more UEs and decoded correctly. For NR V2X, in order to enable unicast communication at the physical layer, as described above, a HARQ retransmission mechanism needs to be specifically designed.

Existing technical literature

Non-patent literature

Non-Patent Document 1: RP-140518, Work itemproposal 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 3GPP V2X Phase 2

Non-Patent Document 5: RP-181480, New SID Proposal: Study NR V2X

Summary of the invention

In order to solve at least part of the above problems, the present invention proposes a method performed by a user equipment and user equipment, which can determine configuration information of an appropriate slot format at a user equipment that performs direct communication between UE and UE, or Send edge connection system information with appropriate reference subcarrier spacing.

According to the present invention, a method performed by an edge-connected user equipment is proposed, which includes: the edge-connected user equipment sends edge connection control information SCI, and the SCI includes indication information of whether to enable HARQ feedback.

Preferably, the indication information of whether to enable HARQ feedback is a 1-bit indication field in the SCI, where a 1-bit indication field set to 1 indicates that HARQ feedback is enabled, and a 1-bit indication field set to 0 indicates to disable HARQ feedback.

In addition, according to the present invention, a method performed by a user equipment is proposed, including: acquiring configuration information of a time slot format from another device different from the user equipment; and configuring the acquired configuration according to the time slot format Information to determine a slot format corresponding to the subcarrier interval configured by the base station or the pre-configured user equipment.

Preferably, the another device is a synchronization reference user equipment of the user equipment, or a base station that communicates with the user equipment.

Preferably, the configuration information of the slot format includes: reference subcarrier interval, and / or configuration period, and / or number of downlink slots, and / or number of downlink orthogonal frequency division multiplexing OFDM symbols, and / or uplink The number of time slots and / or the number of upstream OFDM symbols.

Preferably, the step of determining the slot format corresponding to the subcarrier interval configured by the base station or the pre-configured user equipment includes: based on the reference subcarrier interval and the reference subcarrier interval included in the configuration information of the slot format The base station configuration or the numerical relationship between the subcarrier intervals pre-configured in the user equipment, the number of the downlink time slots and / or the number of the downlink OFDM symbols included in the configuration information of the time slot format, and / Or the number of uplink time slots, and / or the number of uplink OFDM symbols are converted into a time slot format described below, the time slot format includes the number of second downlink time slots, and / or the number of second downlink OFDM symbols, And / or the number of second uplink time slots, and / or the number of second uplink OFDM symbols.

In addition, according to the present invention, a method performed by a user equipment is proposed, including: acquiring configuration information including a slot format of a reference subcarrier interval from another device different from the user equipment; and transmitting edge connection system information , The edge connection system information includes an indication of subcarrier spacing.

Preferably, the another device is a synchronization reference user equipment of the user equipment, or a base station that communicates with the user equipment.

Preferably, the indication of the subcarrier interval is the minimum subcarrier interval or 0 pre-configured in the user equipment, or the reference subcarrier interval.

In addition, according to the present invention, there is also provided a user equipment, including: a processor; and a memory, storing instructions, wherein the instructions execute the above method when executed by the processor.

According to the present invention, it is possible to determine configuration information of an appropriate slot format at one user equipment performing direct UE-to-UE communication, or transmit edge connection system information having an appropriate reference subcarrier interval.

BRIEF DESCRIPTION

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

FIG. 1 is a schematic diagram illustrating an example of configuration information of a TDD uplink and downlink time slot format broadcast by an NR base station in the related art.

FIG. 2 is a schematic sequence diagram showing a direct communication process between UE and UE.

FIG. 3 is a diagram for explaining two resource allocation methods in a direct communication process between UE and UE.

4 is a flowchart illustrating a method performed by a user equipment according to Embodiment 1 of the present invention.

5 is a schematic diagram showing an example of a slot format before and after conversion in Embodiment 1 of the present invention.

6 is a flowchart illustrating a method performed by a user equipment according to Embodiment 2 of the present invention.

7 is a flowchart illustrating a method performed by a user equipment according to Embodiment 3 of the present invention.

8 is a flowchart illustrating a method performed by a user equipment according to Embodiment 4 of the present invention.

9 is a block diagram illustrating user equipment UE according to the present invention.

detailed description

The present invention will be described in detail below with reference to the 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, a detailed description of well-known technologies that are not directly related to the present invention is omitted to prevent confusion in understanding the present invention.

The following uses the 5G mobile communication system and its subsequent evolution as an example application environment, and specifically describes multiple embodiments according to the present invention. However, it should be noted that the present invention is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as a communication system after 5G and a 4G mobile communication system before 5G.

The following describes some terms related to the present invention. Unless otherwise specified, the terms related to the present invention are defined here. The terms given in the present invention may adopt different naming methods in the LTE, LTE-Advanced, LTE-Advanced Pro, NR and later communication systems, but the unified terminology used in the present invention, when applied to a specific system, It can be replaced with the terminology used in the corresponding system.

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

LTE: LongTerm Evolution, long-term evolution technology

NR: New Radio, new wireless, new air interface

PDCCH: Physical Downlink Control Channel, physical downlink control channel

DCI: Downlink Control Information, downlink control information

PDSCH: Physical Downlink Shared Channel, physical downlink shared channel

UE: User Equipment, user equipment

eNB: evolved NodeB, evolved base station

gNB: NR base station

TTI: Transmission Time Interval, transmission time interval

OFDM: Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing

C-RNTI: Cell Radio Network Temporary Identifier, the temporary identifier of the cell wireless network

CSI: Channel State Indicator, channel state indicator

HARQ: Hybrid Automatic Request, hybrid automatic repeat request

CSI-RS: CSI-ReferenceSignal, channel state measurement reference signal

CRS: Cell Reference, cell-level reference signal

PUCCH: Physical Uplink Control Channel, physical uplink control channel

PUSCH: Physical Uplink Shared Channel, physical uplink shared channel

UL-SCH: Uplink Shared Channel, uplink shared channel

Sidelink: edge connection

SCI: Sidelink Control Information, edge connection control information

PSCCH: Physical Sidelink Control Channel, physical edge connection control channel

MCS: Modulation and Coding Scheme, modulation and coding scheme

PRB: Physical Resource Block, physical resource block

PSSCH: Physical Sidelink Shared Channel, physical edge connection 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: SoundingReferenceSignal, detection reference signal

DMRS: Demodulation Reference Signal, demodulation reference signal

CRC: Cyclic Redundancy Check, cyclic redundancy check

PSDCH: Physical Sidelink Discovery Channel, physical edge connection discovery channel

PSBCH: Physical Sidelink Broadcast Channel, physical edge connection broadcast channel

SFI: Slot Format Indication, time slot format indication

TDD: Time Division Duplexing, time division duplex

FDD: Frequency, Duplexing, Frequency Division Duplex

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

SLSS: Sidelink synchronization Signal, edge connection synchronization signal

PSSS: Primary, Sidelink, Synchronization, Signal, edge connected to the main synchronization signal

SSSS: Secondary, Sidelink, Synchronization, Signal, edge connection secondary synchronization signal

PCI: Physical Cell ID, physical cell ID

BWP: BandWidthPart, bandwidth segment / part

The following is a description of the technology associated with the inventive solution. Unless otherwise specified, the same terms in the specific embodiments have the same meaning as in the technology.

Sidelink communication scenarios

1) No network coverage (Out-of-Coverage): No two UEs performing edge connection communication have network coverage (for example, the UE cannot detect any cell that meets the "cell selection criteria" on the frequency where edge connection communication is required ).

2) There is network coverage (In-Coverage): Both UEs that perform edge connection communication have network coverage (for example, the UE detects at least one cell that meets the "cell selection criterion" at a frequency that requires edge connection communication).

3) Partial-Coverage: One of the UEs performing edge connection communication has no network coverage, and the other UE has network coverage.

From the UE side, the UE has only two scenarios: no network coverage and network coverage. Partial network coverage is described from the connection of UEs on both sides of the edge connection communication.

LTE TDD uplink and downlink configuration information

LTE supports a total of 7 types of TDD uplink and downlink configuration information, numbered TDD UL / DL configuration 0 to 6, as shown in Table 4.2-2 below. Among them, "D" indicates a downlink subframe (subframe), "U" indicates an uplink subframe, and "S" indicates a special subframe (Special Subframe). The special subframe is composed of a downlink symbol (DwPTS), a guard interval (Gap), and an uplink symbol (UpPTS). The present invention is not related to the specific configuration of the special subframe and will not be repeated here. The LTE base station configures the TDD uplink and downlink configuration information of the cell in SIB1.

Table 4.2-2

LTE V2X SLSS / PSBCH and MIB

The LTE edge connection uses LTE uplink resources, and the design of the physical layer channel structure is also similar to LTE uplink.

LTE Edge Connection defines the Edge Connection Synchronization Signal (SLSS), which is used to synchronize the frequency and time between two UEs that perform edge connection communication, especially when at least one of the UEs does not have network coverage, which is obtained by one UE SLSS synchronization signal sent by another UE. SLSS includes primary synchronization signal PSSS and secondary synchronization signal SSSS. PSSS and SSSS can carry SLSS ID. The principle is the same as that of PCI in LTE and NR cellular communication, which is carried by primary synchronization signal and secondary synchronization signal.

The LTE edge connection also defines the PSBCH, which is used to broadcast system information related to the edge connection (system information), where,

1) The time-frequency resources used by the PSBCH occupy 72 subcarriers in the center of the edge-connected carrier in the frequency domain, and occupy one subframe for the PSBCH in the time domain, but exclude those used for the DMRS reference signal and the above-mentioned SLSS synchronization signal RE.

2) The system information related to the edge connection transmitted on the PSBCH may be MIB-SL-V2X (MasterInformationBlock-SL-V2X, the main information block for V2X), which includes:

■ The configuration of transmission bandwidth, using the parameter sl-Bandwidth.

■ TDD configuration, use the parameter tdd-ConfigSL. There are 8 situations in tdd-ConfigSL. Where none means that the edge connection carrier sending the MIB is FDD, 0 means TDD UL / DL configuration information 0, 1 means TDD UL / DL configuration information 1, and so on.

■ The DFN (direct frame number) used to transmit SLSS and PSBCH, using the parameter directFrameNumber.

■ The DSFN (direct subframe number) used to transmit SLSS and PSBCH, using the parameter directSubframeNumber.

■ There is a network coverage flag indicating whether the UE transmitting the MIB-SL-V2X has LTE network coverage, using the parameter inCoverage.

LTE V2X UE TDD configuration information determination method

The LTE base station instructs V2X edge connection communication related resource configuration information through SIB21. In addition, the UE can pre-configure a set of V2X edge connection parameters through a high-level protocol, and use the parameter SL-V2X-Preconfiguration. UEs with network coverage can obtain configuration information related to V2X edge connection communication through SIB21, and UEs without network coverage can obtain configuration related to V2X edge connection communication through pre-configured V2X edge connection parameters and MIB-SL-V2X sent by other UEs information.

The UE with network coverage obtains the TDD uplink and downlink configuration information of the cell through SIB1 sent by the base station. In LTE V2X, a UE without network coverage (denoted as UE1) can select the SLSS / PSBCH transmitted by another UE (with or without network coverage, denoted as UE2) as the synchronization reference for edge connection transmission. UE2 can be considered It is the "synchronization reference UE" (or SyncRef UE for short) of UE1. UE2 carries tdd-ConfigSL in the transmitted PSBCH, and UE1 obtains TDD uplink and downlink configuration information by receiving the edge connection system information.

LTE V2X UE sends SLSS / PSBCH

When the V2X UE has data to transmit, the UE needs to send SLSS / PSBCH. At this time, the UE needs to determine the value of tdd-ConfigSL in the PSBCH.

1) UE with network coverage: The value of tdd-ConfigSL has the same meaning as the tdd-Config configuration information in the LTE base station SIB1, that is, if the SIB1 is configured as TDD UL / DL configuration information 2, the UE will The value is set to TDD uplink and downlink configuration information 2, and so on;

2) UE without network coverage: If the UE selects "SyncRef UE", the value of tdd-ConfigSL and the tdd-ConfigSL in MasterInformationBlock-SL-V2X sent by "Sync Reference UE" The value is the same.

NR parameter set (numerology)

NR supports 5 seed carrier intervals, which are 15k, 30k, 60k, 120k, and 240kHz (corresponding to μ = 0, 1, 2, 3, 4). Table 4.2-1 shows the supported transmission parameter set, as shown below .

Table 4.2-1

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

Only when μ = 2, that is, the extended CP is supported in the case of 60 kHz subcarrier spacing, and only the normal CP is supported in the case of other subcarrier spacing. For a normal (Normal) CP, each slot contains 14 OFDM symbols; for an extended CP, each slot contains 12 OFDM symbols. For μ = 0, that is 15kHz subcarrier spacing, 1 slot = 1ms; μ = 1, 30kHz subcarrier spacing, 1 slot = 0.5ms; μ = 2, 60kHz subcarrier spacing, 1 slot = 0.25ms, and so on.

NR SFI instructions and determination methods

The gNB configures the cell-level slot format through the TDD-UL-DL-ConfigurationCommon in SIB1, which includes:

● Reference subcarrier spacing μ _ref ;

● High-level parameters pattern1, including the following high-level parameters:

■ Configuration period P (ms);

■ The number of downlink slots d _slots , the downlink slots only contain downlink OFDM symbols (may be called DL-only slot);

■ Number of downlink OFDM symbols d _sym ;

■ Number of upstream slots u _slots , the upstream slots only contain upstream OFDM symbols (may be called UL-only slots);

■ Number of uplink OFDM symbols u _sym .

The period of the above configuration information is Pms, corresponding to continuous

Time slots. FIG. 1 shows the specific meaning of each high-level parameter included in pattern1. Among the S time slots, the first are d _slots and the downlink slots, and u _slots and the upstream slots are located at the end of the S slots. d _sym downlink OFDM symbols are located after the downlink time slot, u _sym uplink OFDM symbols are located before the uplink time slot, and the rest

Each OFDM symbol is an X symbol (X represents a flexible symbol). In different application scenarios, the X symbol may be a downlink symbol, or an uplink symbol, or as a guard interval symbol between downlink and uplink. Among them, for normal CP (Normal CP),

For Extended CP (Extended CP),

The TDD-UL-DL-ConfigurationCommon in SIB1 may contain high-level parameter pattern2. Pattern2 pattern1 same form and configuration information (pattern2 parameters _{include: d slots, 2, u slots} , 2, d sym, 2, u sym, 2), the same reference subcarrier spacing and pattern1 μ _ref.

In NR, gNB configures at most 4 downlink BWPs and 4 uplink BWPs for each UE. The configuration information of each BWP contains an indication μ of the subcarrier interval in the BWP. gNB ensures that μ _ref ≤ μ (subcarrier spacing of any downlink or uplink BWP of the UE).

Determination of LTE V2X P _step

LTE V2X contains periodic services, and the period of service generation is about P _serv = 100ms. P _step represents the number of uplink subframes available in P _serv . The following table 14.1.1-1 shows the values of P _step in LTE V2X when different TDD uplink and downlink configuration information is used. For example, for TDD UL / DL configuration information 2, each system frame contains 2 uplink subframes. In the service period of _Pserv = 100ms, a total of 20 uplink subframes are included. Table 14.1.1-1 shows the determination of P _step for edge connection transmission modes 3 and 4, as shown in the following table.

Table 14.1.1-1

The basic process of LTE V2X direct communication

Figure 2 shows the basic process of LTE V2X UE direct communication. UE1 sends edge connection control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH. SCI format 1 contains PSSCH scheduling information, such as time and frequency domain resources, MCS, and so on. The PSSCH carries data (sidelink data: edge connection data) sent by UE1 to UE2 in FIG. 1.

1) The PSCCH occupies one subframe in the time domain and two consecutive PRBs in the frequency domain. A predefined value 510 is used during the initialization of the scrambling sequence. The PSCCH can carry SCI format 1, including at least the time and frequency domain resource information of the PSSCH, such as the frequency domain resource indicator field, indicating that the PSCCH corresponds to the starting sub-channel number of the PSSCH and the number of consecutive sub-channels.

2) The PSSCH also occupies a subframe in the time domain, and is on the same subframe as the corresponding PSCCH frequency multiplexing (FDM). The PSSCH is in the form of a sub-channel in the frequency domain. The sub-channel is n _subCHsize consecutive PRBs in the frequency domain. The n _subCHsize is configured by the RRC parameter, and the number of sub-channels is indicated by the frequency domain resource indication field of the SCI format 1 .

LTE V2X resource allocation mode Transmission Mode 3/4

FIG. 3 shows two resource allocation methods of LTE V2X, which are respectively called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (Transmission Mode 4). In LTE V2X, when there is eNB network coverage, the base station can configure the resource allocation mode of the UE through UE-level RRC signaling SL-V2X-ConfigDedicated, or called the UE's transmission mode.

1) Resource allocation method based on base station scheduling: When the RRC signaling SL-V2X-ConfigDedicated is configured as scheduled-r14, it indicates that the UE is configured as a transmission mode based on base station scheduling. The base station configures SL-V-RNTI through RRC, and sends an uplink scheduling grant UL grant to the UE through PDCCH (DCI format 5A). The above uplink scheduling grant includes at least information such as the frequency domain resource indication of the PSSCH. After successfully monitoring the SL-V-RNTI scrambled PDCCH, the UE uses the PSSCH frequency domain resource indication field in the uplink scheduling grant as the frequency domain resource scheduling information of the PSSCH in SCI format 1.

2) UE-sensing-based resource allocation method: when RRC signaling SL-V2X-ConfigDedicated is configured as ue-Selected-r14, it indicates that the UE is configured as a UE-aware transmission mode. In the above transmission mode, the base station configures the available transmission resource pool, and the UE determines the transmission resources of the PSCCH and PSSCH in the transmission resource pool (resource) according to certain criteria (such as RSRP, etc.), and sends the PSCCH and PSSCH according to the process in FIG. . In the present invention, the method for determining the resource pool and the criterion for the UE to determine the available resources are not described in detail.

LTE Edge Connection Discovery (Discovery) Mode

LTE edge connection defines two discovery models (Discovery Models).

1) Mode A: The discovery mode called "I am here". Mode A contains two types of UEs.

■ Notification UE (Announcing UE): The UE notifies the discovery message that the neighboring UE can receive and use the above discovery message for edge connection discovery;

■ Monitoring UE (Monitoring UE): The neighboring UE that monitors the discovery message sent by the notification UE.

2) Pattern B: The discovery pattern called "Who is there?" Or "Are you there?" Mode B contains two types of UEs.

■ Discoverer UE (Discoverer UE): The UE sends a discovery message. The discovery message contains request information.

■ Discovered UE (Discoveree UE): The UE receives the request information and replies to the information related to the request message.

Unless otherwise specified, in all embodiments and implementations of the present invention, d _slots , u _slots , d _sym , u _sym can be selected from d _{slots, 2} , u _{slots, 2} , d _{sym, 2} , u _{sym, 2} in sequence. Equivalent replacement, the present invention does not make special restrictions on this.

[Example 1]

4 is a flowchart illustrating a method performed by a user equipment according to Embodiment 1 of the present invention.

Next, the method executed by the user equipment according to Embodiment 1 of the present invention will be described in detail with reference to FIG. 4.

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

In step S401, the user equipment receives the system information sent by the synchronization reference user equipment. The system information may include configuration information in a slot format. Optionally, the configuration information may include a reference subcarrier interval (denoted by μ _ref ), and / or a period P of configuration information, and / or a number of downlink slots (denoted by d _slots ), and / or a number of downlink OFDM symbols ( _Denoted by d _sym ), and / or the number of upstream slots (denoted by u _slots ), and / or the number of upstream OFDM symbols (denoted by u _sym ).

In step S403, the user equipment determines the slot format (slot format) corresponding to the subcarrier interval μ configured by the base station or the user equipment pre-configured parameter according to the obtained configuration information of the slot format. As an example, an implementation manner of the determination method is as follows:

● P ′ = P

●

●

●

●

Among them, floor represents the rounding down function. For the subcarrier interval μ, the slot format period determined by the user equipment is P′ms, which corresponds to consecutive S ′ = P ′ × 2 ^μ slots. Among the S 'time slots, the first are d _slots ' downstream slots, and u _slots 'upstream slots are located at the end of S' slots. d _sym ′ downstream OFDM symbols are located after d _slots ′ downstream slots, u _sym ′ upstream OFDM symbols are located before u _slots ′ upstream slots, and the rest

The OFDM symbols are X symbols.

As described above, in step S403, the sub-carrier using the reference configuration information acquired in the slot format to the base station is configured μ _ref interval value or the relationship between the user equipment [mu] subcarriers preconfigured interval, acquired The d _slots , d _sym , u _slots , and u _sym in the configuration information of the _received slot format are converted into d ′ _slots , d ′ _sym , u ′ _slots , u _sym ′ as the slot format corresponding to the subcarrier interval μ.

The upper part of FIG. 5 schematically shows an example of configuration information of the slot format before conversion acquired from the synchronization reference user equipment, and the lower part of FIG. 5 shows an example of the slot format after conversion at step S403.

Optionally, in step S401 of Embodiment 1 of the present invention, another possible implementation manner is that the user equipment receives the system information sent from the gNB. The system information may include configuration information in a slot format. Optionally, the configuration information may include a reference subcarrier interval (denoted by μ _ref ), a configuration period P, a number of downlink slots (denoted by d _slots ), a number of downlink OFDM symbols (denoted by d _sym ), and a number of uplink slots ( _Denoted by u _slots ), the number of uplink OFDM symbols (denoted by u _sym ).

Optionally, in step S403 of Embodiment 1,

or,

Where ceil represents the rounding function.

■ For the case of normal CP, if u ′ _sym = 14, the user equipment can change the determined u ′ _sym to 0 and u ′ _slots to u ′ _slots +1.

■ In the case of extended CP, if u ′ _sym = 12, the user equipment can change the determined u ′ _sym to 0 and u ′ _slots to u ′ _slots +1.

That is, when the number of converted uplink OFDM symbols is equal to the number of symbols included in each slot, the number of converted uplink OFDM symbols is set to zero as the newly determined number of uplink OFDM symbols, and the converted uplink time The number of slots is increased by one as the newly determined number of upstream slots.

[Example 2]

6 is a flowchart showing a method performed by a user equipment according to Embodiment 2 of the present invention.

In the second embodiment of the present invention, the steps performed by the user equipment include:

In step S601, the user equipment acquires system information including time slot format configuration information sent by the base station. The system information includes a reference subcarrier interval (denoted by μ _ref ).

In step S603, the user equipment sends edge connection system information. The system information includes an indication of subcarrier spacing.

Optionally, in step S601 of the second embodiment of the present invention, another implementation manner is for the user equipment to obtain the edge connection system information containing the slot format configuration information sent by the synchronization reference user equipment. The system information includes a reference subcarrier interval (denoted by μ _ref ).

Optionally, in step S601 of Embodiment 2 of the present invention, the configuration information sent by the base station or the synchronous reference user equipment may include the period P of the configuration information and / or the downlink time under the premise of including the reference subcarrier interval The number of _slots d _slots , and / or the number of downlink OFDM symbols d _sym , and / or the number of uplink slots u _slots , and / or the number of uplink OFDM symbols u _sym (the above configuration information may be collectively referred to as first configuration information).

Optionally, in step S603 of Embodiment 2 of the present invention, the edge connection system information includes an indication of subcarrier spacing. The indication may be the minimum subcarrier interval μ _min in the pre-configured parameters of the user equipment, or the indication may be 0 (corresponding to the subcarrier interval of 15 kHz), or the reference subcarrier interval in the first configuration information.

Optionally, in step S603 of Embodiment 2 of the present invention, the edge connection system information may also include the number of downlink slots d ′ _slots and / or the number of downlink symbols d ′ _{sym on} the premise that the reference subcarrier interval is included , And / or the number of upstream slots u ′ _slots , and / or the number of upstream symbols u ′ _sym (may be collectively referred to as second configuration information). The conversion relationship between the second configuration information and the first configuration information is calculated according to the calculation method disclosed in step S403 of Embodiment 1 of the present invention. Calculated in step S403 of the first embodiment, the value of [mu] is the subcarrier spacing a first configuration information comprises a reference sub-carrier spacing, or, most of the subcarriers in the user device pre-configured parameter interval μ _min, or, 0.

[Embodiment 3]

7 is a flowchart showing a method performed by a user equipment according to Embodiment 3 of the present invention.

In the third embodiment of the present invention, the steps performed by the user equipment include:

In step S701, the user equipment receives system information sent by the synchronization reference user equipment. The system information may include first configuration information and / or second configuration information in a slot format. Optionally, the configuration information may include a first configuration period P and / or a second configuration period P ₂ , the number of first uplink time slots (represented by u _slots ) and / or the number of second uplink time slots (represented by u _{slots, 2} means).

In step S703, the user equipment determines the number of available uplink time slots P _{step in the} service period. An implementation manner of the determination method is as follows:

P _step = (u _slots + u _{slots, 2} ) · P _serv / (P + P ₂ )

Among them, _Pserv represents the data cycle of V2X periodic services.

Optionally, in step S701 of Embodiment 3 of the present invention, another possible implementation manner is that the user equipment receives the system information sent from the gNB. The system information may include configuration information in a slot format. Optionally, the configuration information may include a first configuration period P and / or a second configuration period P ₂ , a number of first uplink slots (represented by u _slots ) and / or a number of second uplink slots (represented by u _{slots, 2} means).

Optionally, in step S703 of Embodiment 3 of the present invention, another possible determination method is as follows:

P _step = u _slots · P _serv / P

Among them, _Pserv represents the data cycle of V2X periodic services.

[Embodiment 4]

8 is a flowchart illustrating a method performed by a user equipment according to Embodiment 4 of the present invention.

In the fourth embodiment of the present invention, the steps performed by the user equipment include:

In step S801, the user equipment indicates whether to enable the HARQ function. Alternatively, the user equipment may be indicated in the SCI (or PSCCH), or the user equipment is indicated in the system message (or PSBCH) at the edge connection.

In step S803, the user equipment indicates a resource allocation method. Alternatively, the user equipment may be indicated in the SCI (or PSCCH), or the user equipment is indicated in the system message (PSBCH) at the edge connection.

Optionally, in step S801 of Embodiment 4 of the present invention, one possible implementation manner indicated in the SCI or system message is a 1-bit indication field. Among them, 0 means that the HARQ function is enabled, and 1 means that the HARQ function is disabled, and vice versa. Another possible implementation manner indicated in the SCI or system message is a bitmap indication. Each bit of the bitmap corresponds to a receiving UE. Setting this bit to 0 indicates that the HARQ function of the receiving UE is enabled, and setting to 1 indicates that the HARQ function of the receiving UE is disabled, and vice versa.

Optionally, in step S803 of Embodiment 4 of the present invention, one possible implementation manner indicated in the SCI or system message is a 1-bit indication field. Where 0 represents a resource allocation method based on base station scheduling, and 1 represents a resource allocation method based on user equipment perception, and vice versa.

Optionally, in step S801 and step S803 of Embodiment 4 of the present invention, another implementation manner is that the user equipment indicates in the discovery message (Discovery Message) whether to enable the HARQ function and / or the resource allocation manner of the user equipment. The discovery message may be carried in PSDCH, or PSCCH, or PSSCH, or PSBCH. Optionally, another implementation manner is that during the connection setup (connection setup or establishment), the user equipment indicates or coordinates (coordinate or coordinate) through higher layer signaling (RRC signaling, or NAS signaling, or AS signaling). negotiate) whether to enable the HARQ function and / or the resource allocation mode of the user equipment. The foregoing optional implementation manner also includes the specific implementation manner of the above 1-bit indication field or bitmap indication, which is not limited by the present invention.

9 is a block diagram showing user equipment UE according to the present invention. As shown in FIG. 9, the user equipment UE80 includes a processor 901 and a memory 902. The processor 901 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like. The memory 902 may include, for example, volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory. The memory 902 stores program instructions. When the instruction is executed by the processor 901, the above method executed by the user equipment described in detail in the present invention may be executed.

The method of the present invention and related equipment have been described above in conjunction with the preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary, and the embodiments described above can be combined with each other without conflict. The method of the present invention is not limited to the steps and sequence shown above. The network node and the user equipment shown above may include more modules, for example, they may also include modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs. The various identifications shown above are only exemplary and not limiting, and the present invention is not limited to specific cells as examples of these identifications. Many changes and modifications can be made by those skilled in the art based on 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, various components inside the base station and the 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 processing Device, application specific integrated circuit (ASIC), field programmable gate array (FPGA), programmable logic device (CPLD), etc.

In this application, "base station" may refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, including functions such as resource allocation scheduling, data reception and transmission, and the like. "User equipment" may refer to user mobile terminals, including, for example, mobile phones, notebooks, and other terminal devices that can communicate wirelessly with base stations or micro base stations.

Furthermore, the embodiments of the invention disclosed herein can be implemented on a computer program product. More specifically, the computer program product is a product having a computer-readable medium encoded with computer program logic, and when executed on a computing device, the computer program logic provides related operations to achieve The above technical solution of the present invention. When executed on at least one processor of the computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention. Such an arrangement of the 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 (eg CD-ROM), floppy disk or hard disk, or such as one or more Firmware, microcode, or other media on a ROM or RAM, or PROM chip, or downloadable software images, shared databases, etc. in one or more modules. Software or firmware or such a configuration may be installed on the computing device, so that one or more processors in the computing device execute the technical solutions described in the embodiments of the present invention.

In addition, each functional module or each feature of the base station device and the terminal device used in each of the foregoing embodiments may be implemented or executed by a circuit, and the circuit is usually one or more integrated circuits. Circuits designed to perform various functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs) or general purpose integrated circuits, field programmable gate arrays (FPGAs) or other Programming logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above devices. A general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or 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 advanced technologies that can replace current integrated circuits appear due to advances in semiconductor technology, the present invention can also use integrated circuits obtained using the advanced technologies.

Although the present invention has been shown above in conjunction with the preferred embodiments of the present invention, those skilled in the art will understand that various modifications, substitutions, and changes can 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 embodiments, but should be defined by the appended claims and their equivalents.

Claims (10)

1. A method performed by an edge connection user equipment, including:

   The edge connection user equipment sends edge connection control information SCI,

   The SCI includes indication information of whether to enable HARQ feedback.
2. The method of claim 1, wherein:

   The indication information of whether to enable HARQ feedback is a 1-bit indication field in the SCI, where the 1-bit indication field is set to 1 to enable HARQ feedback, and the 1-bit indication field is set to 0 to disable HARQ feedback.
3. A method performed by user equipment, including:

   Acquiring configuration information in a slot format from another device different from the user equipment; and

   According to the obtained configuration information of the time slot format, a time slot format corresponding to the subcarrier interval configured by the base station or pre-configured in the user equipment is determined.
4. The method according to claim 3, characterized in that

   The another device is a synchronization reference user device of the user equipment, or a base station that communicates with the user equipment.
5. The method according to claim 3, characterized in that

   The configuration information of the time slot format includes: reference subcarrier interval, and / or configuration period, and / or number of downlink time slots, and / or number of downlink orthogonal frequency division multiplexing OFDM symbols, and / or number of uplink time slots , And / or the number of uplink OFDM symbols.
6. The method according to claim 5, wherein the step of determining a slot format corresponding to the subcarrier interval configured by the base station or the pre-configured in the user equipment includes:

   Based on the numerical relationship between the reference subcarrier interval included in the configuration information of the time slot format and the subcarrier interval configured by the base station or pre-configured in the user equipment, including the configuration information of the time slot format The number of the downlink time slots, and / or the number of the downlink OFDM symbols, and / or the number of the uplink time slots, and / or the number of the uplink OFDM symbols are converted into a time slot format described below, the time slot The format includes the number of second downlink time slots, and / or the number of second downlink OFDM symbols, and / or the number of second uplink time slots, and / or the number of second uplink OFDM symbols.
7. A method performed by user equipment, including:

   Acquiring configuration information including a time slot format of a reference subcarrier interval from another device different from the user equipment; and

   Sending edge connection system information, the edge connection system information includes an indication of subcarrier spacing.
8. The method according to claim 7, characterized in that

   The another device is a synchronization reference user device of the user equipment, or a base station that communicates with the user equipment.
9. The method according to claim 7, characterized in that

   The indication of the subcarrier interval is the minimum subcarrier interval pre-configured in the user equipment or 0, or the reference subcarrier interval.
10. A user equipment, including:

    Processor; and

    Memory, storing instructions,

    Wherein, when the instruction is executed by the processor, the method according to any one of claims 1-9 is executed.

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