WO2022017222A1 - 用户设备执行的方法以及用户设备 - Google Patents

用户设备执行的方法以及用户设备 Download PDF

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Publication number
WO2022017222A1
WO2022017222A1 PCT/CN2021/105979 CN2021105979W WO2022017222A1 WO 2022017222 A1 WO2022017222 A1 WO 2022017222A1 CN 2021105979 W CN2021105979 W CN 2021105979W WO 2022017222 A1 WO2022017222 A1 WO 2022017222A1
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WIPO (PCT)
Prior art keywords
timer
retx
rtt
sci
user equipment
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PCT/CN2021/105979
Other languages
English (en)
French (fr)
Inventor
张崇铭
刘仁茂
山田升平
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夏普株式会社
张崇铭
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 夏普株式会社, 张崇铭 filed Critical 夏普株式会社
Priority to EP21846181.2A priority Critical patent/EP4187957A4/en
Priority to US18/016,906 priority patent/US20230292343A1/en
Publication of WO2022017222A1 publication Critical patent/WO2022017222A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H04L1/1851—Time-out mechanisms using multiple timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to the technical field of wireless communication, and more particularly, the present invention relates to a method performed by a user equipment and a corresponding user equipment.
  • V2X Vehicle wireless communication technology
  • V Vehicle to Everything
  • X any object that interacts with the vehicle
  • X mainly includes vehicles, people, traffic Roadside infrastructure and networks.
  • a pair of UEs for V2X service communication can be classified into sending UEs (TX UEs) and receiving UEs (RX UEs) according to the classification of sending and receiving. Since the sending UE is not always sending information, in order to achieve energy saving of the receiving UE, the receiving UE may be set to a discontinuous reception mode (Discontinue Recption, DRX), that is, the receiving UE only performs PSCCH monitoring at an appointed time. So how to define and maintain such an effective listening time on the RX UE side is a problem that needs to be solved.
  • DRX discontinuous reception mode
  • the TX UE can only transmit to the RX UE at the appointed time, including sending the PSCCH targeting the RX UE and the corresponding PSSCH. So how to define and maintain such moments on the TX UE side is also a problem that needs to be solved.
  • the resources for the TX UE to send PSCCH and PSSCH are scheduled by the base station.
  • the TX UE needs to negotiate with the base station to ensure that the resources of the base station also fall on the RX Within the effective monitoring time of the UE, how to negotiate such information is also a problem that needs to be solved.
  • the purpose of the present invention is to provide a method for user equipment execution and user equipment, which can define and maintain an effective listening time on the RX UE side, and can define and maintain the sending and receiving time on the TX UE side. In addition, it can effectively negotiate with the base station to ensure that the resources of the base station also fall within the effective listening time of the RX UE.
  • a method performed by a user equipment UE including: the UE monitors a physical side link control channel PSCCH and receives side link control information during the running of a periodically started timer T-active SCI; when the received SCI information indicates HARQ feedback, start timer T1-retx; when the received SCI information indicates not to perform HARQ feedback, start timer T2-retx; During the running of the timer T1-retx and the timer T2-retx, the UE monitors the PSCCH.
  • the UE may start the timer T1-retx at the end of the transmission of the physical side link feedback channel PSFCH, and the UE may share the corresponding physical side link
  • the timer T2-retx is started at the end or at the beginning of the transmission of the channel PSSCH.
  • a timer T1-rtt and a timer T2-rtt may be further provided, and when the SCI information indicates to perform HARQ feedback, the timer T1-rtt is started, When the timer T1-rtt runs out of time, start the timer T1-retx; when the SCI information indicates that HARQ feedback is not to be performed, start the timer T2-rtt, when the timer T2 - Start the timer T2-retx after rtt runs out of time.
  • the UE may start the timer T1-rtt at the end of the transmission of the physical sidelink feedback channel PSFCH; the UE may share the corresponding physical sidelink The timer T2-rtt is started at the end or at the beginning of channel PSSCH transmission.
  • a timer T-inactive may be started when the UE receives the valid SCI, and the UE may start the timer T-inactive during the running of the timer T-inactive. Monitor the PSCCH.
  • a method performed by a user equipment UE comprising: the UE sending a physical side link control channel PSCCH and sending side link control information during a periodically started timer T-active running SCI; in the case that the sent SCI information indicates to perform HARQ feedback, start the timer T1-retx; in the case that the sent SCI information indicates not to perform HARQ feedback, start the timer T2-retx; During the running of the timer T1-retx and the timer T2-retx, the UE transmits the PSCCH and the physical side link shared channel PSSCH, and receives the physical side link feedback channel PSFCH.
  • the UE may start the timer T1-retx at the end of the PSFCH transmission; the UE may start the timer T1-retx at the end or the beginning of the corresponding PSSCH transmission The timer T2-retx.
  • a timer T1-rtt and a timer T2-rtt may be further provided, and when the SCI information indicates to perform HARQ feedback, the timer T1-rtt is started, When the timer T1-rtt runs out of time, start the timer T1-retx; when the SCI information indicates that HARQ feedback is not to be performed, start the timer T2-rtt, when the timer T2 - Start the timer T2-retx after rtt runs out of time.
  • the UE may start the timer T1-rtt at the end of the PSFCH transmission, and the UE may start the timer T1-rtt at the end or the beginning of the corresponding PSSCH transmission
  • a timer T2-rtt in addition, a timer T-inactive may be started when the UE sends the SCI, and the UE may transmit the PSCCH and the PSSCH during the running period of the timer T-inactive, and the reception of the PSFCH.
  • a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, executes according to the context described by the user equipment method.
  • FIG. 1 is a schematic diagram showing a processing flow of Embodiment 1 of the present disclosure.
  • FIG. 2 is a schematic diagram showing a processing flow of Embodiment 2 of the present disclosure.
  • FIG. 3 is a block diagram showing a user equipment UE according to the present disclosure.
  • TX UE and RX UE there are at least one pair of UEs, TX UE and RX UE in this document. There may also be a set of UEs, one of which is a TX UE and the other UEs are RX UEs.
  • one SCI indicates/schedules the transmission of PSSCH.
  • the UE receiving the SCI may further receive the PSSCH based on the information provided by the SCI, and determine whether to send HARQ acknowledgement information (HARQ-ACK) on the PSFCH channel according to the indication of the SCI.
  • HARQ-ACK HARQ acknowledgement information
  • the HARQ-ACK information may also be referred to as HARQ feedback (HARQ feedback), which is a response of the UE to PSSCH reception.
  • HARQ feedback HARQ feedback
  • the HARQ-ACK information provided by the UE may include acknowledgement information (positive acknowledgement, ACK), or non-acknowledgement information (negative acknowledgement, NACK), or only non-acknowledgement information (NACK).
  • ACK can indicate that the PSSCH or the MAC PDU carried by the PSSCH is correctly decoded/received; NACK can indicate that the PSSCH is not received or the MAC PDU on the received PSSCH is not correctly decoded/received.
  • the RX UE In sidelink transmission, according to whether HARQ-ACK information needs to be sent, the RX UE has two working modes:
  • the HARQ-ACK information needs to be sent through the PSFCH, that is, HARQ feedback is required; in the second mode, there is no need to send the HARQ-ACK information after the PSSCH is received, that is, no HARQ feedback is required.
  • FIG. 1 is a schematic diagram showing a processing flow of Embodiment 1 of the present disclosure.
  • the RX UE can maintain the effective moment of discontinuous reception according to the above different working methods, including:
  • T-active which can be started periodically, and the start cycle or the interval between two starts can be called DRX Cycle.
  • the UE monitors the PSCCH (monitor PSCCH) during the running period of the timer T-active.
  • the monitoring of the PSCCH may refer to that the UE receives the first-level SCI transmitted on the PSCCH during each PSCCH transmission duration (PSSCH duration), and then determines the PSSCH transmission duration according to the received first-level SCI (PSSCH duration), and receive the second-level SCI and transport block transmitted on the PSSCH.
  • PSSCH duration PSCCH transmission duration
  • PSSCH duration PSSCH transmission duration
  • the received SCI (which may include first-level and second-level SCIs) is then treated as a valid SCI and associated with the received transport block.
  • the address information provided in the SCI is of interest to the UE, then such SCI can be used as a valid SCI; or the address information provided in the SCI is the address information of the UE as the receiving target, such an SCI can be used as a valid SCI.
  • step S2 the UE determines whether HARQ feedback is required based on the received SCI information.
  • Specific processing can be performed as follows, for example.
  • HARQ feedback is indicated in the SCI, or HARQ-ACK information needs to be sent, that is, the SCI information indicates that HARQ feedback needs to be performed,
  • the UE starts the timer T1-rtt at the end of the corresponding PSFCH transmission (the end of PSFCH transmission). Specifically, the timer T1-rtt may be started at the first symbol at the end of the PSFCH transmission;
  • the timer T1-retx is stopped.
  • the UE starts the timer T2-rtt at the end (end of PSSCH transmisison) or the beginning (start of PSSCH transmisison) of the corresponding PSSCH transmission.
  • the timer T2-rtt may be started at the end (or the beginning) of the first PSSCH transmission, or T2-rtt may be started after all PSSCH transmissions have ended .
  • the timer T2-retx is stopped.
  • the UE monitors the PSCCH.
  • the monitoring of the PSCCH includes receiving the PSCCH, decoding the SCI carried in the PSCCH, and confirming whether the address information carried in the SCI is valid address information.
  • Valid address information may mean that the destination address in the address information corresponds to the RX UE, and the source address corresponds to the TX UE.
  • the UE when the UE receives a valid SCI, the UE starts the timer T-inactive. During the running of the timer T-inactive, the UE monitors the PSCCH.
  • the UE is in the active period (ACTIVE TIME) or the effective time of discontinuous reception.
  • the active period U receiving E needs to monitor PSCCH.
  • FIG. 2 is a schematic diagram showing a processing flow of Embodiment 2 of the present disclosure. As shown in FIG. 2 , the specific processing flow in Embodiment 2 is as follows.
  • T-active which can be started periodically, and the start cycle or the interval between two starts can be called DRX Cycle.
  • step S1 of Fig. 2 the UE monitors the PSCCH during the running of the timer T-active.
  • step S2 the UE determines whether HARQ feedback is required based on the received SCI information.
  • Specific processing can be performed as follows, for example.
  • HARQ feedback is indicated in the SCI, or HARQ-ACK information needs to be sent, that is, the SCI information indicates that HARQ feedback needs to be performed,
  • the UE starts the timer T1-retx at the end of PSFCH transmission (the end of PSFCH transmission). Specifically, the timer T1-retx may be started at the first symbol at the end of the PSFCH transmission.
  • the SCI indicates to disable HARQ feedback, or indicates that HARQ-ACK information does not need to be sent, or does not indicate that HARQ feedback is enabled, or does not indicate that HARQ-ACK needs to be sent.
  • the UE starts the timer T2-retx at the end (end of PSSCH transmisison) or the beginning (start of PSSCH transmisison) of the corresponding PSSCH transmission.
  • the timer T2-retx can be started at the end (or the beginning) of the first PSSCH transmission, or T2-retx can be started after all PSSCH transmissions have ended .
  • the active period of the receiving UE is defined, and various timers run in order to maintain such active period. From the perspective of the sending UE, the same ACTIVE time can be defined.
  • the TX UE sends during its corresponding ACTIVE TIME.
  • the group address specifically PSCCH and PSSCH carrying information/data; and during this ACTIVE time, receive The PSFCH corresponding to the connection or group address.
  • TX UE is allowed to send PSCCH and optionally PSSCH, and receive PSFCH during the running of timer T-active;
  • start timer T-inactive When TX UE sends SCI, start timer T-inactive;
  • HARQ feedback is indicated in the SCI, or HARQ-ACK information needs to be sent, that is, the SCI indicates that HARQ feedback needs to be performed,
  • the TX UE starts the timer T1-rtt at the end of PSFCH transmission (the end of PSFCH transmission). Specifically, the timer T1-rtt may be started at the first symbol at the end of the PSFCH transmission;
  • the SCI indicates to disable HARQ feedback, or indicates that HARQ-ACK information does not need to be sent, or does not indicate that HARQ feedback is enabled, or does not indicate that HARQ-ACK needs to be sent.
  • the TX UE starts the timer T2-rtt at the end (end of PSSCH transmisison) or the beginning (start of PSSCH transmisison) of the corresponding PSSCH transmission.
  • the timer T2-rtt may be started at the end (or the beginning) of the first PSSCH transmission, or T2-rtt may be started after all PSSCH transmissions have ended .
  • the TX UE is in the active period (ACTIVE TIME), and can transmit PSCCH, transmit PSSCH, and receive PSFCH.
  • timer T1-rtt and timer T2-rtt can be set to zero. Then another implementation of the above scheme may be
  • TX UE sends PSCCH and optional PSSCH during timer T-active running
  • start timer T-inactive When TX UE sends SCI, start timer T-inactive;
  • HARQ feedback is indicated in the SCI, or HARQ-ACK information needs to be sent, that is, the SCI information indicates that HARQ feedback needs to be performed,
  • the TX UE starts the timer T1-retx at the end of PSFCH transmission (the end of PSFCH transmission). Specifically, the timer T1-retx may be started at the first symbol at the end of the PSFCH transmission;
  • the SCI indicates to disable HARQ feedback, or indicates that HARQ-ACK information does not need to be sent, or does not indicate that HARQ feedback is enabled, or does not indicate that HARQ-ACK needs to be sent.
  • the TX UE starts the timer T2-retx at the end (end of PSSCH transmisison) or the beginning (start of PSSCH transmisison) of the corresponding PSSCH transmission.
  • the timer T2-retx can be started at the end (or the beginning) of the first PSSCH transmission, or T2-rtt can be started after all PSSCH transmissions have ended .
  • Example 4 of the present disclosure will be described in detail.
  • the same timer as the RX UE side startup mechanism is defined for the TX UE side to maintain the active period.
  • Different timers can also be defined on the TX UE side to maintain the active period.
  • One implementation could be:
  • TX UE is allowed to send PSCCH and, optionally, PSSCH and receive PSFCH during the running of timer T-active-tx;
  • TX UE starts timer T-inactive-tx when sending SCI
  • the TX UE is in the active period (ACTIVE TIME), and can transmit PSCCH, transmit PSSCH, and receive PSFCH.
  • a logical channel that can be used for transmission needs to be selected. Since a logical channel is always associated with a sidelink connection or a group of addresses, in the selection process, it is necessary to consider whether the corresponding sidelink connection or address mentioned in the foregoing Embodiment-3 is in the active period.
  • the specific implementation can be
  • the TX UE When performing a new transmission, the TX UE selects the destination address corresponding to the logical channel with the highest priority, and this logical channel has sidelink data to transmit. In addition, it is necessary to judge whether the address/sidelink connection corresponding to the logical channel is configured with discontinuous reception. If the discontinuous reception mode is configured, it is also necessary to determine whether the moment of the current transmission belongs to the active period in the discontinuous reception mode. If in the active period, the TX UE may choose this address as the transport address. If it is not in the active period, the TX UE may not select this address as the transport address.
  • the TX UE When the resources (time or frequency resources) transmitted by the sidelink are scheduled by the base station, the TX UE needs to notify the base station of the information of the active period in the above-mentioned Embodiments 1-3, or the related information of discontinuous reception.
  • the specific notification method may be that the TX UE notifies the base station/network side of the preferred (preferred) SL DRX configuration of the UE in the SidelinkUEInformationNR message.
  • the UE can trigger the SidelinkUEInformationNR message Message transmission process.
  • the UE sends a SidelinkUEInformationNR message to the base station/network side.
  • the UE indicates the preferred SL DRX configuration, such as the duration of the relevant timer in the foregoing embodiment, the length of the DRX cycle. This situation may occur when the UE is handed over and the Pcell is changed.
  • FIG. 3 is a schematic structural block diagram of the user equipment UE involved in the present invention.
  • the user equipment UE30 includes a processor 301 and a memory 302.
  • the processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 302 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • the memory 302 has program instructions stored thereon. When the instruction is executed by the processor 301, the above method described in detail in the present invention and executed by the user equipment can be executed.
  • a program running on a device may be a program that causes a computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory systems.
  • a program for realizing the functions of the embodiments of the present invention can be recorded on a computer-readable recording medium.
  • the corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called "computer system” as used herein may be a computer system embedded in the device, and may include an operating system or hardware (eg, peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that dynamically stores a program for a short period of time, or any other recording medium readable by a computer.
  • circuits eg, monolithic or multi-chip integrated circuits.
  • Circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a result of advances in semiconductor technology to replace existing integrated circuits, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.
  • the present invention is not limited to the above-described embodiments. Although various examples of the described embodiments have been described, the invention is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

本发明提供一种用户设备执行的方法以及用户设备。用户设备UE执行的方法，包括：所述UE在周期性启动的定时器T-active运行期间监听物理侧链路控制信道PSCCH并接收侧链路控制信息SCI；在接收到的SCI信息指示进行HARQ反馈的情况下，启动定时器T1-retx；在接收到的SCI信息指示不进行HARQ反馈的情况下，启动定时器T2-retx；在所述定时器T1-retx以及所述定时器T2-retx运行期间，所述UE监听所述PSCCH。

Description

用户设备执行的方法以及用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及由用户设备执行的方法以及相应的用户设备。
背景技术
车用无线通信技术(Vehicleto Everything，V2X)是将车辆与一切事物相连接的新一代信息通信技术，其中V代表车辆，X代表任何与车交互信息的对象，当前X主要包含车、人、交通路侧基础设施和网络。
在一对进行V2X业务通信的UE中，按照发送和接收分类，可以分为发送UE(TX UE)和接收UE(RX UE)。由于发送UE不总是在发送信息，为了实现接收UE的节能，可以将接收UE设置为不连续接收模式(Discontinue Recption，DRX)，即接收UE在约定的时刻才进行PSCCH的监听。那么如何在RX UE侧定义以及维护这样有效的监听时刻是需要解决的问题。
此外，为了保证RX UE能够正确接收，对TX UE的发送也有限制。即TX UE只能在约定的时刻才能向RX UE进行传输，包括发送以RX UE为目标的PSCCH以及对应的PSSCH等。那么如何在TX UE侧定义以及维护这样的时刻也是需要解决的问题。
在一种特定的传输模式下，TX UE发送PSCCH以及PSSCH的资源都是由基站调度的，考虑到RX UE的不连续接收，TX UE需要和基站进行协商，以确保基站的资源同样落在RX UE有效的监听时刻内，那么如何协商这样的信息，也是需要解决的问题。
发明内容
针对现有技术中的上述问题，本发明的目的在于提供一种用户设备执行的方法以及用户设备，能够在RX UE侧定义以及维护有效的监听时刻， 能够在在TX UE侧定义以及维护发送以RX UE为目标的PSCCH以及对应的PSSCH等的时刻，此外能够有效地与基站进行协商，以确保基站的资源同样落在RX UE有效的监听时刻内。
根据本公开的第一方面，提供一种用户设备UE执行的方法，包括：所述UE在周期性启动的定时器T-active运行期间监听物理侧链路控制信道PSCCH并接收侧链路控制信息SCI；在接收到的所述SCI信息指示进行HARQ反馈的情况下，启动定时器T1-retx；在接收到的所述SCI信息指示不进行HARQ反馈的情况下，启动定时器T2-retx；在所述定时器T1-retx以及所述定时器T2-retx运行期间，所述UE监听所述PSCCH。
在上述第一方面的用户设备执行的方法中，所述UE可以在物理侧链路反馈信道PSFCH传输的结尾处启动所述定时器T1-retx，所述UE可以在相应的物理侧链路共享信道PSSCH传输的结尾处或者开始处启动所述定时器T2-retx。
在上述第一方面的用户设备执行的方法中，还可以具备定时器T1-rtt以及定时器T2-rtt，在所述SCI信息指示进行HARQ反馈的情况下，启动所述定时器T1-rtt，当所述定时器T1-rtt运行超时后，启动所述定时器T1-retx；在所述SCI信息指示不进行HARQ反馈的情况下，启动所述定时器T2-rtt，当所述定时器T2-rtt运行超时后，启动所述定时器T2-retx。
在上述第一方面的用户设备执行的方法中，所述UE可以在物理侧链路反馈信道PSFCH传输的结尾处启动所述定时器T1-rtt；所述UE可以在相应的物理侧链路共享信道PSSCH传输的结尾处或者开始处启动所述定时器T2-rtt。
在上述第一方面的用户设备执行的方法中，可以在所述UE接收到有效的所述SCI时，启动定时器定时器T-inactive，在所述定时器T-inactive运行期间，所述UE监听所述PSCCH。
根据本公开的第二方面，提供一种用户设备UE执行的方法，包括：所述UE在周期性启动的定时器T-active运行期间发送物理侧链路控制信道PSCCH并发送侧链路控制信息SCI；在发送的所述SCI信息指示进行HARQ反馈的情况下，启动定时器T1-retx；在发送的所述SCI信息指示不进行HARQ反馈的情况下，启动定时器T2-retx；在所述定时器T1-retx以及所述 定时器T2-retx运行期间，所述UE进行所述PSCCH以及物理侧链路共享信道PSSCH的发送、以及物理侧链路反馈信道PSFCH的接收。
在上述第二方面的用户设备执行的方法中，所述UE可以在所述PSFCH传输的结尾处启动所述定时器T1-retx；所述UE可以在相应的PSSCH传输的结尾处或者开始处启动所述定时器T2-retx。
在上述第二方面的用户设备执行的方法中，还可以具备定时器T1-rtt以及定时器T2-rtt，在所述SCI信息指示进行HARQ反馈的情况下，启动所述定时器T1-rtt，当所述定时器T1-rtt运行超时后，启动所述定时器T1-retx；在所述SCI信息指示不进行HARQ反馈的情况下，启动所述定时器T2-rtt，当所述定时器T2-rtt运行超时后，启动所述定时器T2-retx。
在上述第二方面的用户设备执行的方法中，所述UE可以在PSFCH传输的结尾处启动所述定时器T1-rtt，所述UE可以在相应的PSSCH传输的结尾处或者开始处启动所述定时器T2-rtt，此外，可以在所述UE发送SCI时，启动定时器T-inactive，所述UE在所述定时器T-inactive运行期间，进行所述PSCCH以及所述PSSCH的发送、以及所述PSFCH的接收。
根据本公开的第三方面，提供一种用户设备，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行根据上下文所述的由用户设备执行的方法。
附图说明
图1是表示本公开的实施例1的处理流程的示意图。
图2是表示本公开的实施例2的处理流程的示意图。
图3是表示本公开所涉及的用户设备UE的框图。
在附图中，相同或相似的结构均以相同或相似的附图标记进行标识。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
在具体描述之前，先对本发明中提到的若干术语做如下说明。除非另有指出，本发明中涉及的术语都具有下文的含义。
UE User Equipment  用户设备
NR New Radio  新一代无线技术
Sidelink 侧链路
V2X Vechile to Everything  车联通信
MAC Medium Access Control  多媒体接入控制
MAC CE MAC control element  MAC控制元素
LCID Logical Channle Identity  逻辑信道身份标识
PDU Protocol Data Unit  协议数据单元
SDU Service Data Unit  服务数据单元
PSSCH Physical Sidelink Shared Channel  物理侧链路共享信道
PSFCH Physical Sidelink Feedback Channel  物理侧链路反馈信道
SCI Sidelink Control Information  侧链路控制信息
PSCCH Physical Sidelink Control Channel  物理侧链路控制信道
RRC Radio Resource Control  无线资源控制
HARQ Hybrid Automatic Repeat Request  混合自动重传请求
本文中相关联的，相对应的，相应的等说法可以相互替换。
本文中sidelink和V2X两种说法可以互相替换。
本文中存在至少一对UE，TX UE和RX UE。还可以存在一组UE，其中一个UE是TX UE，其他的UE是RX UE。
HARQ确认信息
在sidelink通信中，一个SCI指示/调度了PSSCH的传输。接收该SCI的UE可以基于该SCI提供的信息进而接收PSSCH，以及根据SCI的指示来确定是否需要在PSFCH信道上发送HARQ确认信息(HARQ acknowledge information，HARQ-ACK)。
HARQ-ACK信息还可以被称为HARQ反馈(HARQ feedback)，是UE对PSSCH接收的一种响应(response)。UE提供的HARQ-ACK信息可以包括确认信息(positive acknowledge，ACK)，或者非确认信息(negative acknowledge，NACK)，或者仅仅是非确认信息(NACK)。
其中，ACK可以指示PSSCH或者是PSSCH携带的MAC PDU被正确解码/接收；NACK可以指示没有收到PSSCH或者是接收到的PSSCH上的MAC PDU没有被正确解码/接收。
在SCI中可以有指示信息指示HARQ feedback是否被使能。如果指示信息指示HARQ feedback被使能(enable)，那么UE需要发送HARQ-ACK information；如果指示信息指示HARQ feedback被去使能(disable)，那么UE不需要发送HARQ-ACK information。
以下，详细描述本发明的若干实施例。
实施例1
在sidelink传输中，根据是否需要发送HARQ-ACK信息，RX UE存在两种工作方式：
方式一在接收到PSSCH后，还需要通过PSFCH发送HARQ-ACK信息，即需要进行HARQ反馈；方式二在接收到PSSCH后无需发送HARQ-ACK信息，即无需进行HARQ反馈。
作为一个例子，图1是表示本公开的实施例1的处理流程的示意图。
RX UE可以根据上述不同的工作方式来维护不连续接收的有效时刻，具体包括：
定义一个定时器T-active，该定时器可以是周期性的启动，启动周期或者两次启动的间隔可以被称为DRX Cycle。
如图1所示，在步骤S1中，UE在定时器T-active运行期间监听PSCCH(monitor PSCCH)。其中，监听PSCCH可以是指UE在每一个PSCCH的传输持续时期(PSSCH duration)接收在PSCCH上传输的第一级SCI，然后根据接收到的第一级SCI来确定(determine)PSSCH的传输持续时期(PSSCH duration)，并接收在PSSCH上传输的第二级SCI以及传输块(transport block)。然后将接收到的SCI(可以包括第一级和第二级SCI)作为有效的SCI，并且与接收到的传输块相关联。优选的，当SCI中提供的地址信息是UE所感兴趣的，那么这样的SCI才可以作为有效的SCI；或者是SCI中提供过的地址信息是以该UE为接收目标的地址信息，这样的SCI才可以作为有效的SCI。
在步骤S2中，UE基于接收到的SCI信息来判断是否需要进行HARQ反馈。具体处理例如可以按如下方式进行。
在一种情况下，在SCI中指示了使能(enable)HARQ feedback，又或者指示了需要发送HARQ-ACK信息，也就是说，SCI信息指示需要进行HARQ反馈，
那么UE在对应的PSFCH传输的结尾处(the end of PSFCH transmission)启动定时器T1-rtt。具体的可以是在PSFCH传输结尾的第一个符号处启动定时器T1-rtt；
当T1-rtt运行超时后，启动定时器T1-retx。
以及可选的，当UE接收到PSSCH中携带的MAC PDU时，无论是正确解码还是没有解码成功，如果定时器T1-retx正在运行，那么停止定时器T1-retx。
在另外一种情况下，在SCI中指示了去使能HARQ feedback，或者指示了不需要发送HARQ-ACK information，又或者不指示需要发送HARQ-ACK information，
那么UE在相应的PSSCH传输的结尾处(end of PSSCH transmisison)或者开始处(start of PSSCH transmisison)启动定时器T2-rtt。优选的，如果该SCI调度了多个PSSCH传输，那么可以在第一个PSSCH传输的结尾处(或者开始处)启动定时器T2-rtt，或者是在所有的PSSCH传输都结束后启动T2-rtt。
当T2-rtt运行超时后，启动定时器T2-retx。
以及可选的，当UE接收到PSSCH中携带的MAC PDU时，无论是正确解码还是没有解码成功，如果定时器T2-retx正在运行，那么停止定时器T2-retx。
在上述T1-retx以及T2-retx运行期间，UE监听PSCCH。其中监听PSCCH包括接收PSCCH，并解码其中携带的SCI，以及确认SCI中所携带的地址信息是否是有效的地址信息。有效的地址信息可以是指地址信息中的目的地地址对应于RX UE，源地址对应于TX UE。
在上述两种情况下，当UE接收到了有效的SCI时，UE启动定时器 T-inactive。在定时器T-inactive运行期间，UE监听PSCCH。
可以认为，在定时器T-active，T-inactive，T1-retx以及T2-retx运行期间UE处于活跃期(ACTIVE TIME)或者是不连续接收的有效时刻。在活跃期内，U接收E需要监听PSCCH.
实施例2
以下，对本公开的实施例2进行说明。实施例2与实施例1不同点在于，可以将实施例1中的上述T1-rtt以及T2-rtt设置时长为零。作为一个例子，图2是表示本公开的实施例2的处理流程的示意图。如图2所示，实施例2中的具体处理流程如下。
定义一个定时器T-active，该定时器可以是周期性的启动，启动周期或者两次启动的间隔可以被称为DRX Cycle。
在图2的步骤S1中，UE在定时器T-active运行期间监听PSCCH。
在步骤S2中，UE基于接收到的SCI信息来判断是否需要进行HARQ反馈。具体处理例如可以按如下方式进行。
在一种情况下，在SCI中指示了使能(enable)HARQ feedback，又或者指示了需要发送HARQ-ACK信息，也就是说，SCI信息指示需要进行HARQ反馈，
那么UE在PSFCH传输的结尾处(the end of PSFCH transmission)启动定时器T1-retx。具体的可以是在PSFCH传输结尾的第一个符号处启动定时器T1-retx。
在另外一种情况下，在SCI中指示了去使能(disable)HARQ feedback，或者指示了不需要发送HARQ-ACK information，又或者不指示使能HARQ feedback，又或者不指示需要发送HARQ-ACK information，，
那么UE在相应的PSSCH传输的结尾处(end of PSSCH transmisison)或者开始处(start of PSSCH transmisison)启动定时器T2-retx。优选的，如果该SCI调度了多个PSSCH传输，那么可以在第一个PSSCH传输的结尾处(或者开始处)启动定时器T2-retx，或者是在所有的PSSCH传输都结束后启动T2-retx。
实施例3
以下，本公开的实施例3进行详细说明。在实施例1-2中定义了接收UE的活跃期，以及为了维护这样的活跃期运行的各种定时器。从发送UE的角度而言，可以定义同样的ACTIVE time，对于一个sidelink连接，或者是针对一组目标地址和源地址(a pair of source and destination address)，TX UE在其对应的ACTIVE TIME期间发送对应于(或者属于)该连接的信息/数据，或者是发送对应于(或者属于)该组地址的信息/数据，具体可以是携带信息/数据的PSCCH以及PSSCH；以及在该ACTIVE time期间，接收对应于该连接或者该组地址的PSFCH。
TX UE在定时器T-active运行期间被允许发送PSCCH以及可选的还可以发送PSSCH，以及接收PSFCH；
TX UE发送SCI时，启动定时器T-inactive；
在一种情况下，在SCI中指示了使能(enable)HARQ feedback，又或者指示了需要发送HARQ-ACK信息，也就是说，SCI指示了需要进行HARQ反馈，
那么TX UE在PSFCH传输的结尾处(the end of PSFCH transmission)启动定时器T1-rtt。具体的可以是在PSFCH传输结尾的第一个符号处启动定时器T1-rtt；
当T1-rtt运行超时后，启动定时器T1-retx。
在另外一种情况下，在SCI中指示了去使能(disable)HARQ feedback，或者指示了不需要发送HARQ-ACK information，又或者不指示使能HARQ feedback，又或者不指示需要发送HARQ-ACK information，
那么TX UE在相应的PSSCH传输的结尾处(end of PSSCH transmisison)或者开始处(start of PSSCH transmisison)启动定时器T2-rtt。优选的，如果该SCI调度了多个PSSCH传输，那么可以在第一个PSSCH传输的结尾处(或者开始处)启动定时器T2-rtt，或者是在所有的PSSCH传输都结束后启动T2-rtt。
当T2-rtt运行超时后，启动定时器T2-retx。
在上述定时器T-active，T-inactive，T1-retx以及T2-retx运行期间TX UE处于活跃期(ACTIVE TIME)，可以进行PSCCH的发送以及PSSCH的发 送，以及PSFCH的接收。
在特殊情况下，可以设置定时器T1-rtt以及定时器T2-rtt为零。那么上述方案的又一实施方式可以是
TX UE在定时器T-active运行期间发送PSCCH以及可选的PSSCH；
TX UE发送SCI时，启动定时器T-inactive；
在一种情况下，在SCI中指示了使能(enable)HARQ feedback，又或者指示了需要发送HARQ-ACK信息，也就是说，SCI信息指示需要进行HARQ反馈，
那么TX UE在PSFCH传输的结尾处(the end of PSFCH transmission)启动定时器T1-retx。具体的可以是在PSFCH传输结尾的第一个符号处启动定时器T1-retx；
在另外一种情况下，在SCI中指示了去使能(disable)HARQ feedback，或者指示了不需要发送HARQ-ACK information，又或者不指示使能HARQ feedback，又或者不指示需要发送HARQ-ACK information，
那么TX UE在相应的PSSCH传输的结尾处(end ofPSSCH transmisison)或者开始处(start of PSSCH transmisison)启动定时器T2-retx。优选的，如果该SCI调度了多个PSSCH传输，那么可以在第一个PSSCH传输的结尾处(或者开始处)启动定时器T2-retx，或者是在所有的PSSCH传输都结束后启动T2-rtt。
实施例4
以下，对本公开的实施例4进行详细说明。在实施例3中为TX UE侧定义了和RX UE侧启动机制相同的定时器用来维护活跃期。在TX UE侧还可以定义不同的定时器用来维护活跃期。一种实施方式可以是：
TX UE在定时器T-active-tx运行期间被允许发送PSCCH以及可选的，还可以发送PSSCH，以及接收PSFCH；
TX UE发送SCI时，启动定时器T-inactive-tx；
在上述定时器T-active-tx，T-inactive-tx运行期间，TX UE处于活跃期(ACTIVE TIME)，可以进行PSCCH的发送以及PSSCH的发送，以及 PSFCH的接收。
实施例5
对于TX UE，当执行一次新的传输(new transmission)时，需要选择可以用于传输的逻辑信道。由于逻辑信道总是与一个sidelink连接或者是一组地址相关联，因此，在选择的过程中，需要考虑前述实施例-3中提到的对应的sidelink连接或者地址是否处于活跃期。具体的实施方式可以是
当执行一次新的传输时，TX UE选择具有最高优先级的逻辑信道对应的目的地址，并且该逻辑信道有sidelink数据需要传输。此外还需要判断该逻辑信道对应的地址/sidelink连接是否被配置了不连续接收。如果被配置了不连续接收方式，那么还需要判断本次传输的时刻是否属于该不连续接收方式中的活跃期。如果处于活跃期，那么TX UE可以选择该地址作为传输地址。如果不处于活跃期，那么TX UE不可以选择该地址作为传输地址。
实施例6
当sidelink传输的资源(时间或者频率资源)是由基站调度时，TX UE需要通知基站上述实施例1-3中的活跃期的信息，或者是不连续接收的相关的信息。具体的通知方式可以是TX UE在SidelinkUEInformationNR message消息中通知基站/网络侧UE偏好的(preferred)SL DRX配置。
当UE在连接态时，并且这个UE被上层指示了DRX配置的需求，或者是节能的需求，如果UE在当前的主小区(primary cell，PCell)没有被配置SL DRX，那么UE可以触发SidelinkUEInformationNR message消息传输流程.在该流程中UE向基站/网络侧发送SidelinkUEInformationNR message消息。在该消息中，UE指示了偏好的SL DRX配置，例如前述实施例中的相关定时器的时长，DRX cycle循环周期的长度。这种情况可以发生在UE发生了切换(handover)，Pcell进行了变更(change)的时候。
实施例7
实施例7中对本公开的用户设备UE进行简单说明。图3是本发明涉及的用户设备UE的简要结构框图。如图3所示，该用户设备UE30包括处理 器301和存储器302。处理器301例如可以包括微处理器、微控制器、嵌入式处理器等。存储器302例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器302上存储有程序指令。该指令在由处理器301运行时，可以执行本发明详细描述的由用户设备执行的上述方法。
运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本发明各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本发明的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本发明并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本发明并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本发明的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本发明也包括不偏离本发明主旨的任何设计改动。另外，可以在权利要求的范围内对本发明进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本发明的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (10)

  1. 一种用户设备UE执行的方法，包括：
    所述UE在周期性启动的定时器T-active运行期间监听物理侧链路控制信道PSCCH并接收侧链路控制信息SCI；
    在接收到的所述SCI信息指示进行HARQ反馈的情况下，启动定时器T1-retx；
    在接收到的所述SCI信息指示不进行HARQ反馈的情况下，启动定时器T2-retx；
    在所述定时器T1-retx以及所述定时器T2-retx运行期间，所述UE监听所述PSCCH。
  2. 根据权利要求1所述的用户设备UE执行的方法，其中，
    所述UE在物理侧链路反馈信道PSFCH传输的结尾处启动所述定时器T1-retx，
    所述UE在相应的物理侧链路共享信道PSSCH传输的结尾处或者开始处启动所述定时器T2-retx。
  3. 根据权利要求1所述的用户设备UE执行的方法，其中，
    还具备定时器T1-rtt以及定时器T2-rtt，
    在所述SCI信息指示进行HARQ反馈的情况下，启动所述定时器T1-rtt，当所述定时器T1-rtt运行超时后，启动所述定时器T1-retx；
    在所述SCI信息指示不进行HARQ反馈的情况下，启动所述定时器T2-rtt，当所述定时器T2-rtt运行超时后，启动所述定时器T2-retx。
  4. 根据权利要求3所述的用户设备UE执行的方法，其中，
    所述UE在物理侧链路反馈信道PSFCH传输的结尾处启动所述定时器T1-rtt；
    所述UE在相应的物理侧链路共享信道PSSCH传输的结尾处或者开始处启动所述定时器T2-rtt。
  5. 根据权利要求1至4的任意一项所述的用户设备UE执行的方法，其中，
    在所述UE接收到有效的所述SCI时，启动定时器定时器T-inactive， 在所述定时器T-inactive运行期间，所述UE监听所述PSCCH。
  6. 一种用户设备UE执行的方法，包括：
    所述UE在周期性启动的定时器T-active运行期间发送物理侧链路控制信道PSCCH并发送侧链路控制信息SCI；
    在发送的所述SCI信息指示进行HARQ反馈的情况下，启动定时器T1-retx；
    在发送的所述SCI信息指示不进行HARQ反馈的情况下，启动定时器T2-retx；
    在所述定时器T1-retx以及所述定时器T2-retx运行期间，所述UE进行所述PSCCH以及物理侧链路共享信道PSSCH的发送、以及物理侧链路反馈信道PSFCH的接收。
  7. 根据权利要求1所述的用户设备UE执行的方法，其中，
    所述UE在所述PSFCH传输的结尾处启动所述定时器T1-retx；
    所述UE在相应的PSSCH传输的结尾处或者开始处启动所述定时器T2-retx。
  8. 根据权利要求1所述的用户设备UE执行的方法，其中，
    还具备定时器T1-rtt以及定时器T2-rtt，
    在所述SCI信息指示进行HARQ反馈的情况下，启动所述定时器T1-rtt，当所述定时器T1-rtt运行超时后，启动所述定时器T1-retx；
    在所述SCI信息指示不进行HARQ反馈的情况下，启动所述定时器T2-rtt，当所述定时器T2-rtt运行超时后，启动所述定时器T2-retx。
  9. 根据权利要求8所述的用户设备UE执行的方法，其中，
    所述UE在PSFCH传输的结尾处启动所述定时器T1-rtt，
    所述UE在相应的PSSCH传输的结尾处或者开始处启动所述定时器T2-rtt，
    在所述UE发送SCI时，启动定时器T-inactive，所述UE在所述定时器T-inactive运行期间，进行所述PSCCH以及所述PSSCH的发送、以及所述PSFCH的接收。
  10. 一种用户设备UE，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求1至9中任一项所述的方法。
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