Method executed by user equipment and user equipment

Abstract

The present invention provides a method executed by a user equipment and the user equipment. The method executed by the user equipment UE comprises: the UE monitors a physical side link control channel PSCCH and receives side link control information SCI during the operation of a periodically started timer T‑active; when the received SCI information indicates that HARQ feedback is to be performed, the timer T1‑retx is started; when the received SCI information indicates that HARQ feedback is not to be performed, the timer T2‑retx is started; during the operation of the timer T1‑retx and the timer T2‑retx, the UE monitors the PSCCH.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and more particularly, to a method executed by a user equipment and a corresponding user equipment. Background Art

[0002] Vehicle to Everything (V2X) is a new generation of information and communication technology that connects vehicles to everything, where V stands for vehicle and X stands for any object that interacts with the vehicle. Currently, X mainly includes vehicles, people, roadside infrastructure and networks.

[0003] In a pair of UEs that perform V2X service communications, they can be divided into a transmitting UE (TX UE) and a receiving UE (RX UE) according to the classification of sending and receiving. Since the transmitting UE is not always sending information, in order to achieve energy saving of the receiving UE, the receiving UE can be set to a discontinuous reception mode (DRX), that is, the receiving UE monitors the PSCCH only at the agreed time. Then how to define and maintain such an effective monitoring time on the RX UE side is a problem that needs to be solved.

[0004] In addition, in order to ensure that the RX UE can receive correctly, there are also restrictions on the transmission of the TX UE. That is, the TX UE can only transmit to the RX UE at the agreed time, including sending the PSCCH and the corresponding PSSCH targeted at the RX UE. How to define and maintain such a time on the TX UE side is also a problem that needs to be solved.

[0005] In a specific transmission mode, the resources for TX UE to send PSCCH and PSSCH are scheduled by the base station. Considering the discontinuous reception of RX UE, TX UE needs to negotiate with the base station to ensure that the resources of the base station also fall within the effective monitoring time of RX UE. How to negotiate such information is also a problem that needs to be solved. Summary of the invention

[0006] In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a method executed by a user equipment and a user equipment, which can define and maintain effective listening moments on the RX UE side, can define and maintain the moments for sending PSCCH and corresponding PSSCH etc. targeted at the RX UE on the TX UE side, and can also effectively negotiate with the base station to ensure that the resources of the base station also fall within the effective listening moments of the RX UE.

[0007] According to a first aspect of the present disclosure, a method performed by a user equipment UE is provided, comprising: the UE monitors a physical side link control channel PSCCH and receives side link control information SCI during the operation of a periodically started timer T-active; when the received SCI information indicates that HARQ feedback is to be performed, a timer T1-retx is started; when the received SCI information indicates that HARQ feedback is not to be performed, a timer T2-retx is started; while the timer T1-retx and the timer T2-retx are running, the UE monitors the PSCCH.

[0008] In the method performed by the user equipment of the above-mentioned first aspect, the UE can start the timer T1-retx at the end of the physical side link feedback channel PSFCH transmission, and the UE can start the timer T2-retx at the end or the beginning of the corresponding physical side link shared channel PSSCH transmission.

[0009] In the method executed by the user equipment of the above-mentioned first aspect, a timer T1-rtt and a timer T2-rtt may also be provided. When the SCI information indicates that HARQ feedback is to be performed, the timer T1-rtt is started. When the timer T1-rtt times out, the timer T1-retx is started. When the SCI information indicates that HARQ feedback is not to be performed, the timer T2-rtt is started. When the timer T2-rtt times out, the timer T2-retx is started.

[0010] In the method performed by the user equipment of the above-mentioned first aspect, the UE may start the timer T1-rtt at the end of the physical side link feedback channel PSFCH transmission; the UE may start the timer T2-rtt at the end or the beginning of the corresponding physical side link shared channel PSSCH transmission.

[0011] In the method performed by the user equipment of the first aspect above, when the UE receives the valid SCI, a timer T-inactive may be started, and during the running of the timer T-inactive, the UE monitors the PSCCH.

[0012] According to a second aspect of the present disclosure, a method executed by a user equipment UE is provided, comprising: the UE sends a physical side link control channel PSCCH and sends side link control information SCI during the operation of a periodically started timer T-active; when the sent SCI information indicates that HARQ feedback is to be performed, a timer T1-retx is started; when the sent SCI information indicates that HARQ feedback is not to be performed, a timer T2-retx is started; during the operation of the timer T1-retx and the timer T2-retx, the UE sends the PSCCH and a physical side link shared channel PSSCH, and receives a physical side link feedback channel PSFCH.

[0013] In the method performed by the user equipment of the above second aspect, the UE may start the timer T1-retx at the end of the PSFCH transmission; the UE may start the timer T2-retx at the end or the beginning of the corresponding PSSCH transmission.

[0014] In the method executed by the user equipment of the above-mentioned second aspect, a timer T1-rtt and a timer T2-rtt may also be provided. When the SCI information indicates that HARQ feedback is to be performed, the timer T1-rtt is started. When the timer T1-rtt times out, the timer T1-retx is started. When the SCI information indicates that HARQ feedback is not to be performed, the timer T2-rtt is started. When the timer T2-rtt times out, the timer T2-retx is started.

[0015] In the method performed by the user equipment of the above-mentioned second aspect, the UE may start the timer T1-rtt at the end of the PSFCH transmission, and the UE may start the timer T2-rtt at the end or the beginning of the corresponding PSSCH transmission. In addition, the timer T-inactive may be started when the UE sends the SCI, and the UE may send the PSCCH and the PSSCH, and receive the PSFCH during the operation of the timer T-inactive.

[0016] According to a third aspect of the present disclosure, a user device is provided, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, execute a method performed by the user device according to the context. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram showing the processing flow of Example 1 of the present disclosure.

[0018] Figure 2 It is a schematic diagram showing the processing flow of Example 2 of the present disclosure.

[0019] Figure 3 is a block diagram showing a user equipment UE involved in the present disclosure.

[0020] In the drawings, the same or similar structures are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0021] 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.

[0022] Before the detailed description, some terms mentioned in the present invention are explained as follows. Unless otherwise specified, the terms involved in the present invention have the following meanings.

[0023] UE User Equipment

[0024] NR New Radio Next Generation Wireless Technology

[0025] Sidelink

[0026] V2X Vechile to Everything

[0027] MAC Medium Access Control Multimedia Access Control

[0028] MAC CE MAC control element MAC control element

[0029] LCID Logical Channel Identity Logical Channel Identity

[0030] PDU Protocol Data Unit Protocol Data Unit

[0031] SDU Service Data Unit Service Data Unit

[0032] PSSCH Physical Sidelink Shared Channel Physical Sidelink Shared Channel

[0033] PSFCH Physical Sidelink Feedback Channel Physical Sidelink Feedback Channel

[0034] SCI Sidelink Control Information Sidelink Control Information

[0035] PSCCH Physical Sidelink Control Channel Physical Sidelink Control Channel

[0036] RRC Radio Resource Control

[0037] HARQ Hybrid Automatic Repeat Request Hybrid Automatic Repeat Request

[0038] In this article, the terms associated, corresponding, and relevant can be used interchangeably.

[0039] In this article, the terms sidelink and V2X can be used interchangeably.

[0040] In this article, there is at least one pair of UEs, a TX UE and a RX UE. There may also be a group of UEs, one of which is a TX UE and the other UEs are RX UEs.

[0041] HARQ ACKNOWLEDGEMENT

[0042] In sidelink communication, an SCI indicates / schedules the transmission of the PSSCH. A UE receiving the SCI can 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.

[0043] HARQ-ACK information may also be referred to as HARQ feedback, which is a response of the UE to PSSCH reception. The HARQ-ACK information provided by the UE may include positive acknowledgement (ACK), negative acknowledgement (NACK), or just negative acknowledgement (NACK).

[0044] Among them, 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.

[0045] In the SCI, there may be indication information indicating whether HARQ feedback is enabled. If the indication information indicates that HARQ feedback is enabled (enable), the UE needs to send HARQ-ACK information; if the indication information indicates that HARQ feedback is disabled (disable), the UE does not need to send HARQ-ACK information.

[0046] Several embodiments of the present invention are described in detail below.

[0047] Example 1

[0048] In sidelink transmission, depending on whether HARQ-ACK information needs to be sent, the RX UE has two working modes:

[0049] In method 1, after receiving PSSCH, HARQ-ACK information needs to be sent through PSFCH, that is, HARQ feedback is required; in method 2, HARQ-ACK information does not need to be sent after receiving PSSCH, that is, HARQ feedback is not required.

[0050] As an example, Figure 1 It is a schematic diagram showing the processing flow of Example 1 of the present disclosure.

[0051] The RX UE can maintain the effective time of discontinuous reception according to the above different working modes, including:

[0052] A timer T-active is defined. The timer may be started periodically. The start period or the interval between two starts may be called a DRX Cycle.

[0053] like Figure 1As shown, in step S1, the UE monitors PSCCH (monitorPSCCH) during the operation of the timer T-active. Among them, monitoring 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 (determine) the PSSCH transmission duration (PSSCH duration) according to the received first-level SCI, and receives the second-level SCI and transport block (transport block) transmitted on the PSSCH. Then the received SCI (which may include the first-level and second-level SCI) is used as a valid SCI and associated with the received transport block. Preferably, when the address information provided in the SCI is of interest to the UE, then such SCI can be used as a valid SCI; or when the address information provided in the SCI is address information with the UE as the receiving target, such SCI can be used as a valid SCI.

[0054] In step S2, the UE determines whether HARQ feedback is required based on the received SCI information. The specific processing may be performed as follows, for example.

[0055] In one case, the SCI indicates that HARQ feedback is enabled, or indicates that HARQ-ACK information needs to be sent, that is, the SCI information indicates that HARQ feedback needs to be performed.

[0056] Then the UE starts the timer T1-rtt at the end of the corresponding PSFCH transmission. Specifically, the timer T1-rtt may be started at the first symbol at the end of the PSFCH transmission;

[0057] When T1-rtt times out, timer T1-retx is started.

[0058] And optionally, when the UE receives the MAC PDU carried in the PSSCH, whether it is decoded correctly or not, if the timer T1-retx is running, then the timer T1-retx is stopped.

[0059] In another case, the SCI indicates that HARQ feedback is disabled, or indicates that HARQ-ACK information does not need to be sent, or does not indicate that HARQ-ACK information needs to be sent.

[0060] Then the UE starts the timer T2-rtt at the end (end of PSSCH transmission) or the start (start of PSSCH transmission) of the corresponding PSSCH transmission. Preferably, if the SCI schedules multiple PSSCH transmissions, the timer T2-rtt can be started at the end (or the beginning) of the first PSSCH transmission, or after all PSSCH transmissions are completed.

[0061] When T2-rtt times out, timer T2-retx is started.

[0062] And optionally, when the UE receives the MAC PDU carried in the PSSCH, whether it is decoded correctly or not, if the timer T2-retx is running, then the timer T2-retx is stopped.

[0063] During the T1-retx and T2-retx operations, the UE monitors the PSCCH. The PSCCH monitoring includes receiving the PSCCH, decoding the SCI carried therein, and confirming whether the address information carried in the SCI is valid address information. The valid address information may refer to the destination address in the address information corresponding to the RX UE and the source address corresponding to the TX UE.

[0064] In the above two cases, when the UE receives a valid SCI, the UE starts a timer T-inactive. During the running of the timer T-inactive, the UE monitors the PSCCH.

[0065] It can be considered that the UE is in the active period (ACTIVE TIME) or the effective time of discontinuous reception during the operation of timers T-active, T-inactive, T1-retx and T2-retx. During the active period, the UE needs to monitor the PSCCH when receiving E.

[0066] Example 2

[0067] The following describes the second embodiment of the present disclosure. The difference between the second embodiment and the first embodiment is that the T1-rtt and T2-rtt in the first embodiment can be set to zero. As an example, Figure 2 Schematic diagram showing the processing flow of Example 2 of the present disclosure. Figure 2 As shown, the specific processing flow in Example 2 is as follows.

[0068] A timer T-active is defined. The timer may be started periodically. The start period or the interval between two starts may be called a DRX Cycle.

[0069] exist Figure 2 In step S1, the UE monitors the PSCCH while the timer T-active is running.

[0070] In step S2, the UE determines whether HARQ feedback is required based on the received SCI information. The specific processing may be performed as follows, for example.

[0071] In one case, the SCI indicates that HARQ feedback is enabled, or indicates that HARQ-ACK information needs to be sent, that is, the SCI information indicates that HARQ feedback needs to be performed.

[0072] Then the UE starts the timer T1-retx at the end of PSFCH transmission. Specifically, the timer T1-retx may be started at the first symbol at the end of PSFCH transmission.

[0073] In another case, the SCI indicates that HARQ feedback is disabled, or that HARQ-ACK information does not need to be sent, or that HARQ feedback is not enabled, or that HARQ-ACK information does not need to be sent.

[0074] Then the UE starts the timer T2-retx at the end of the corresponding PSSCH transmission (end of PSSCH transmission) or at the start of PSSCH transmission. Preferably, if the SCI schedules multiple PSSCH transmissions, the timer T2-retx can be started at the end (or start) of the first PSSCH transmission, or after all PSSCH transmissions are completed.

[0075] Example 3

[0076] Hereinafter, embodiment 3 of the present disclosure is described in detail. In embodiments 1-2, the active period of the receiving UE and various timers for maintaining such an active period are defined. From the perspective of the sending UE, the same ACTIVE time can be defined. For a sidelink connection, or for a pair of source and destination address, the TX UE sends information / data corresponding to (or belonging to) the connection during its corresponding ACTIVE TIME, or sends information / data corresponding to (or belonging to) the group address, which may specifically be the PSCCH and PSSCH carrying the information / data; and during the ACTIVE time, receives the PSFCH corresponding to the connection or the group address.

[0077] The TX UE is allowed to send PSCCH and optionally PSSCH, and receive PSFCH during the running of timer T-active;

[0078] When the TX UE sends the SCI, it starts the timer T-inactive;

[0079] In one case, the SCI indicates that HARQ feedback is enabled, or indicates that HARQ-ACK information needs to be sent, that is, the SCI indicates that HARQ feedback needs to be performed.

[0080] Then the TX UE starts the timer T1-rtt at the end of PSFCH transmission. Specifically, the timer T1-rtt may be started at the first symbol at the end of PSFCH transmission;

[0081] When T1-rtt times out, timer T1-retx is started.

[0082] In another case, the SCI indicates that HARQ feedback is disabled, or that HARQ-ACK information does not need to be sent, or that HARQ feedback is not enabled, or that HARQ-ACK information does not need to be sent.

[0083] Then the TX UE starts the timer T2-rtt at the end of the corresponding PSSCH transmission (end of PSSCH transmission) or at the start of PSSCH transmission (start of PSSCH transmission). Preferably, if the SCI schedules multiple PSSCH transmissions, the timer T2-rtt can be started at the end (or start) of the first PSSCH transmission, or after all PSSCH transmissions are completed.

[0084] When T2-rtt times out, timer T2-retx is started.

[0085] During the operation of the above timers T-active, T-inactive, T1-retx and T2-retx, the TX UE is in an active period (ACTIVE TIME), and can send PSCCH and PSSCH, and receive PSFCH.

[0086] In special cases, the timer T1-rtt and the timer T2-rtt can be set to zero. Then another implementation of the above scheme can be

[0087] The TX UE sends the PSCCH and optionally the PSSCH during the timer T-active.

[0088] When the TX UE sends the SCI, it starts the timer T-inactive;

[0089] In one case, the SCI indicates that HARQ feedback is enabled, or indicates that HARQ-ACK information needs to be sent, that is, the SCI information indicates that HARQ feedback needs to be performed.

[0090] Then the TX UE starts the timer T1-retx at the end of PSFCH transmission. Specifically, the timer T1-retx may be started at the first symbol at the end of PSFCH transmission;

[0091] In another case, the SCI indicates that HARQ feedback is disabled, or that HARQ-ACK information does not need to be sent, or that HARQ feedback is not enabled, or that HARQ-ACK information does not need to be sent.

[0092] Then the TX UE starts the timer T2-retx at the end of the corresponding PSSCH transmission (end of PSSCH transmission) or at the start of PSSCH transmission (start of PSSCH transmission). Preferably, if the SCI schedules multiple PSSCH transmissions, the timer T2-retx can be started at the end (or start) of the first PSSCH transmission, or T2-rtt can be started after all PSSCH transmissions are completed.

[0093] Example 4

[0094] The following is a detailed description of Embodiment 4 of the present disclosure. In Embodiment 3, a timer with the same start mechanism as that of the RX UE side is defined for the TX UE side to maintain the active period. Different timers may also be defined on the TX UE side to maintain the active period. One implementation method may be:

[0095] The TX UE is allowed to send PSCCH and, optionally, PSSCH, and receive PSFCH while the timer T-active-tx is running;

[0096] When the TX UE sends the SCI, it starts the timer T-inactive-tx;

[0097] During the operation of the above timers T-active-tx and T-inactive-tx, the TX UE is in an active period (ACTIVETIME), and can send PSCCH and PSSCH, and receive PSFCH.

[0098] Example 5

[0099] For TX UE, when performing a new transmission, it is necessary to select a logical channel that can be used for transmission. Since the logical channel is always associated with a sidelink connection or a group of addresses, it is necessary to consider whether the corresponding sidelink connection or address mentioned in the above embodiment-3 is in an active period during the selection process. The specific implementation method can be

[0100] When performing a new transmission, the TX UE selects the destination address corresponding to the logical channel with the highest priority, and the logical channel has sidelink data to be transmitted. In addition, it is necessary to determine whether the address / sidelink connection corresponding to the logical channel is configured for discontinuous reception. If the discontinuous reception mode is configured, it is also necessary to determine whether the moment of this transmission belongs to the active period in the discontinuous reception mode. If it is in the active period, the TX UE can select the address as the transmission address. If it is not in the active period, the TX UE cannot select the address as the transmission address.

[0101] Example 6

[0102] When the resources (time or frequency resources) of the sidelink transmission are scheduled by the base station, the TX UE needs to notify the base station of the active period information in the above embodiments 1-3, or the related information of discontinuous reception. The specific notification method can be that the TX UE notifies the base station / network side UE of the preferred SL DRX configuration in the SidelinkUEInformationNR message.

[0103] When the UE is in a connected state, and the upper layer indicates the need for DRX configuration or energy saving, if the UE is not configured with SL DRX in the current primary cell (PCell), the UE can trigger the SidelinkUEInformationNR message transmission process. In this process, the UE sends a SidelinkUEInformationNR message to the base station / network side. In this message, the UE indicates the preferred SL DRX configuration, such as the duration of the relevant timer in the aforementioned embodiment, and the length of the DRX cycle. This situation can occur when the UE undergoes a handover and the Pcell is changed.

[0104] Example 7

[0105] In Example 7, the user equipment UE of the present disclosure is briefly described. Figure 3 1 is a simplified structural diagram of a user equipment UE according to the present invention. Figure 3As shown, 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, etc. The memory 302 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 302 stores program instructions. When the instructions are executed by the processor 301, the above method performed by the user equipment described in detail in the present invention may be executed.

[0106] The program running on the device according to the present invention can be a program that enables a computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU). The program or the information processed by the program can be temporarily stored in 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 memory systems.

[0107] The program for realizing the functions of various embodiments of the present invention can be recorded on a computer-readable recording medium. The corresponding functions can be realized by making a computer system read the program recorded on the recording medium and executing these programs. The so-called "computer system" herein can be a computer system embedded in the device, and can include an operating system or hardware (such as a peripheral device). "Computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium of a short-term dynamic storage program, or any other recording medium that is computer-readable.

[0108] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., single-chip 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 devices. The general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits may be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

[0109] In addition, the present invention is not limited to the above-mentioned embodiments. Although various examples of the embodiments have been described, the present invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as terminal devices or communication devices, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

[0110] As mentioned above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above embodiments, and the present invention also includes any design changes that do not deviate from the main purpose of the present invention. In addition, the present invention can be modified in various ways within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, the components with the same effect described in the above embodiments can be replaced by each other.

Claims

1. A user equipment, comprising: processor; as well as a memory in electronic communication with the processor, wherein instructions stored in the memory are executable to: During the running of the first timer, monitoring a physical sidelink control channel PSCCH to receive first sidelink control information SCI, and For the first SCI received, If the first SCI enables HARQ feedback, then: starting a second timer at the end of a physical sidelink feedback channel PSFCH transmission for said HARQ feedback, starting a third timer after expiration of the second timer, and During the running of the third timer, monitoring the PSCCH to receive a second SCI, and If the first SCI disables the HARQ feedback, then: starting a fourth timer at the end of the physical side link shared channel PSSCH transmission indicated in the first SCI, starting a fifth timer after expiration of the fourth timer, and While the fifth timer is running, the PSCCH is monitored to receive the second SCI.

2. A method performed by a user equipment, comprising: During the running of the first timer, monitoring a physical sidelink control channel PSCCH to receive first sidelink control information SCI, and For the first SCI received, If the first SCI enables HARQ feedback, then: starting a second timer at the end of a physical sidelink feedback channel PSFCH transmission for said HARQ feedback, starting a third timer after expiration of the second timer, and During the running of the third timer, monitoring the PSCCH to receive a second SCI, and If the first SCI disables the HARQ feedback, then: starting a fourth timer at the end of the physical side link shared channel PSSCH transmission indicated in the first SCI, starting a fifth timer after expiration of the fourth timer, and While the fifth timer is running, the PSCCH is monitored to receive the second SCI.

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