WO2020244438A1 - 信息传输方法及装置 - Google Patents

信息传输方法及装置 Download PDF

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Publication number
WO2020244438A1
WO2020244438A1 PCT/CN2020/092857 CN2020092857W WO2020244438A1 WO 2020244438 A1 WO2020244438 A1 WO 2020244438A1 CN 2020092857 W CN2020092857 W CN 2020092857W WO 2020244438 A1 WO2020244438 A1 WO 2020244438A1
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WIPO (PCT)
Prior art keywords
retransmission
receiving
side terminal
terminal
information
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PCT/CN2020/092857
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English (en)
French (fr)
Inventor
许辉
卢忱
王凤伟
赵祥模
惠飞
Original Assignee
中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP20818609.8A priority Critical patent/EP3958491A4/en
Priority to US17/611,238 priority patent/US20220216945A1/en
Publication of WO2020244438A1 publication Critical patent/WO2020244438A1/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
    • H04L1/1806—Go-back-N protocols
    • 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
    • H04L1/1854—Scheduling and prioritising arrangements
    • 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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • 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
    • H04L1/1893—Physical mapping arrangements
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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]
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint
    • 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 disclosure relates to but is not limited to the field of communications.
  • the communication-based collision warning system uses advanced wireless communication technology and a new generation of information processing technology to realize real-time information interaction between cars, cars and roadside infrastructure, and inform each other of the current status (including the position and speed of the vehicle).
  • Acceleration, driving path) and learned road environment information collaboratively perceive road hazards, provide a variety of collision warning information in time, and prevent road traffic safety accidents. This has become a new way of thinking about road traffic safety problems in various countries. .
  • an information transmission method including: a sending-side terminal confirms activation/deactivation of a hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) retransmission of the PC5; and the sending-side terminal The V2X service data is retransmitted to the receiving terminal through the PC5 according to the negative response information of the receiving terminal.
  • a hybrid automatic repeat request Hybrid Automatic Repeat reQuest, HARQ
  • an information transmission device including: a confirmation module for confirming activation/deactivation of HARQ retransmission of PC5; and a retransmission module for receiving negative response information from the terminal
  • the V2X service data is retransmitted to the receiving terminal through the PC5.
  • a storage medium in which a computer program is stored, and when the computer program is run by a processor, the processor executes the information transmission method according to the present disclosure .
  • an electronic device including a memory and a processor, the memory stores a computer program, and the processor executes the information transmission method according to the present disclosure when the computer program is running .
  • Figure 1 is a schematic diagram of the Internet of Vehicles according to related technologies
  • Figure 2 is a schematic diagram of a V2X service architecture based on the related technology through the PC5 interface;
  • Fig. 3 is a flowchart of an information transmission method according to an embodiment of the present disclosure.
  • Fig. 4 is a flowchart of an information transmission method according to an embodiment of the present disclosure.
  • FIG. 12 is a block diagram of the module structure of the information transmission device according to the present disclosure.
  • Fig. 13 is a schematic diagram of a system structure according to an embodiment of the present disclosure.
  • V2X Vehicle to Everything
  • V2X Vehicle to Everything
  • V2V vehicle-to-vehicle
  • V2V vehicle-to-vehicle
  • V2P Pedestrian
  • V2I Vehicle to Infrastructure
  • Figure 1 shows a schematic diagram of the Internet of Vehicles.
  • LTE Long Term Evolution
  • 5G NR New Radio
  • the Road Side Unit can receive vehicle requests to ensure that the vehicle is connected to the Internet and has the function of a gateway; in addition, the RSU also has the functions of data calculation, storage, and forwarding.
  • DSRC Dedicated Short Range Communication
  • MAC Medium Access Control
  • V2X V2X technology based on cellular network 5G NR has just begun to be discussed, and there is currently no standard.
  • V2X may be realized through PC5 interface or Uu interface.
  • the PC5 interface refers to the air interface from Device to Device (D2D)
  • the Uu interface refers to the air interface from User Equipment (UE) to the base station (gNB).
  • D2D Device to Device
  • UE User Equipment
  • gNB base station
  • NR V2X supports unicast, groupcast and broadcast transmissions. All three transmissions can be implemented within coverage, partial coverage, or outside coverage.
  • NR V2X transmission modes include mode1 and mode2.
  • Mode1 refers to the PC5 resources configured by the gNB to transmit V2X services
  • mode2 refers to the PC5 resources that the UE independently selects to transmit V2X services.
  • NR V2X In NR V2X, the highest reliability requirement is 99.999%, and the minimum delay requirement is 3 ms.
  • NR V2X uses retransmission on the PC5 interface to solve the reliability problem.
  • the receiving end UE In order to achieve transmission, the receiving end UE is used to send a response signal to the sending end UE.
  • the response signal is used to indicate whether the V2X message is correctly received and decoded. According to the indication of the response signal, the sending end can retransmit the V2X message.
  • a dedicated physical channel is designed, that is, a physical sidelink feedback channel (Physical Sidelink Feedback CHannel, PSFCH).
  • PSFCH Physical Sidelink Feedback CHannel
  • HARQ retransmission is used to improve the reliability of V2X services, but the implementation of HARQ retransmission has not yet been determined, for example, how to activate or deactivate HARQ retransmission, and how to determine HARQ retransmission Resources and so on are still inconclusive.
  • the devices operated by the method embodiments of the present disclosure are described below.
  • the devices involved mainly include terminal devices and access network devices.
  • the terminal device may include at least one of the following: Onboard Unit (OBU), Road Side Unit (RSU), User Equipment (UE), V-UE , P-UE, Wearables, UE-to-network relay, IoT/Manual Semi-automatic Toll Lane (Internet of Things, IoT/Manual Toll Collection, MTC) terminals.
  • OBU Onboard Unit
  • RSU Road Side Unit
  • UE User Equipment
  • V-UE User Equipment
  • P-UE Personal User Equipment
  • Wearables UE-to-network relay
  • IoT/Manual Semi-automatic Toll Lane Internet of Things, IoT/Manual Toll Collection, MTC
  • V-UE in the embodiments of the present disclosure refers to Vehicle-UE
  • P-UE refers to Pedestrian-UE
  • PC5 and SideLink have the same meaning, and both are used to indicate the air interface link between UEs.
  • the terminal device determines whether to activate/deactivate the HARQ retransmission of PC5 according to gNB instructions or pre-configuration rules.
  • the UE selects initial transmission and retransmission resources according to the configuration of gNB or autonomously, and according to the received The PSFCH signal determines whether to send retransmission data.
  • the access network device is a base station, including one of the following: eNB and gNB.
  • the access network device is mainly responsible for: configuring PSFCH resources and HARQ retransmission resources for the terminal device, and instructing the terminal device to activate/deactivate the HARQ retransmission.
  • FIG. 3 is a flowchart of an information transmission method according to an embodiment of the present disclosure. As shown in FIG. 3, the flow includes the following steps S302 to S304.
  • step S302 the transmitting terminal confirms to activate/deactivate the HARQ retransmission of the PC5.
  • step S304 the sending-side terminal retransmits the V2X service data to the receiving-side terminal through the PC5 according to the negative response information of the receiving-side terminal.
  • the activated/deactivated HARQ retransmission may be configured or pre-configured by the base station.
  • Base station configuration refers to: the sending end UE sends instruction information to the base station, and the base station configures activation/deactivation retransmission according to the instruction information.
  • the indication information includes attributes of the V2X service (including delay requirements, reliability requirements, etc.) and PC5 link status.
  • the PC5 link status includes link quality, congestion level, and so on.
  • the link quality can be obtained by measuring the reference signal transmitted on the PC5 channel.
  • the link quality of the PC5 interface is a measurement result of the demodulation reference signal (DMRS) of the PC5 interface.
  • the degree of congestion may be represented by a channel busy rate (Channel Busy Rate, CBR).
  • CBR channel busy rate
  • the response information includes one of the following: positive and negative. If a negative response is received, the sending end UE sends a request message to the base station, where the request message is used to request PC5 to retransmit resources;
  • the retransmission resources may be configured by the base station and notified to the sending end UE during the initial transmission, or the sending end UE Make an appointment, and then the sending end UE informs the receiving end UE.
  • the sending end UE retransmits the V2X data; when receiving a positive response signal, the retransmission resources can be used for other UEs.
  • PC5 communication includes same frequency or different frequency.
  • Same frequency refers to the shared frequency of Uu and PC5 communication; different frequency refers to the dedicated frequency used for PC5 communication, such as 5.9GHz V2X frequency.
  • the PC5 refers to the interface between UEs, and other names (such as SideLink) may also be used.
  • the PC5 interface can adopt Prose technology of licensed spectrum or unlicensed spectrum.
  • the following takes UE as a terminal device as an example to further describe the retransmission scheme provided in the present disclosure in further detail. As shown in FIG. 4, it includes the following main steps S401 to S403.
  • step S401 the UE confirms activation/deactivation of HARQ retransmission.
  • the UE can be in mode1 or mode2.
  • the UE adopting mode 1 firstly, according to at least one of the upper-layer V2X service quality of service (Quality of Service, QoS) attribute, PC5 link state, and retransmission activation state, it is determined whether retransmission needs to be activated.
  • the QoS attributes of the V2X service include at least one of the following: delay, reliability, and communication distance.
  • the PC5 link status is used to indicate the PC5 link quality or congestion level.
  • the retransmission activation status may include: activated or inactivated. If the current activation state is active, the UE determines whether to keep active or deactivate retransmission; otherwise, the UE determines whether to activate retransmission. For example: V2X service requires high reliability, PC5 link quality is poor, and retransmission is not activated, the UE initially confirms that retransmission needs to be activated.
  • the UE sends indication information to the base station gNB for instructing to activate the PC5 retransmission request.
  • the indication information can be transmitted via PUCCH/PUSCH, and can adopt scheduling request (Scheduling Request, SR), buffer status report (Buffer Status Report, BSR), or confirmation (Acknowledgement, Ack)/Negative Acknowledgement (Nack), etc. Bearer.
  • the gNB comprehensively determines whether to activate retransmission according to the received instruction information, network status, and operator policy. If it is determined to activate the retransmission, the gNB sends the activation retransmission indication information to the UE; otherwise, the gNB sends the deactivation (inactivation) retransmission indication information to the UE.
  • the gNB may use one of the following to indicate to the UE to activate retransmission: physical layer downlink control information (DCI) signaling, media access control (Media Access Control, MAC) control element (control element, CE) signaling Or radio resource control (Radio Resource Control, RRC) signaling.
  • DCI physical layer downlink control information
  • MAC media access control
  • CE control element
  • RRC radio resource control
  • the gNB can determine to activate/deactivate the PC5 to retransmit and notify the UE.
  • the UE is in RRC-Connected mode.
  • the UE uses a pre-configured rule to determine whether PC5 retransmission needs to be activated/deactivated.
  • the pre-configured rule is stored in the UE and includes the QoS threshold of the V2X service and/or the PC5 link state threshold. For example, when the V2X service reliability requirement exceeds the QoS threshold and/or the PC5 link quality is lower than the link state threshold, the UE may determine to activate retransmission.
  • the UE After the UE confirms the activation/deactivation retransmission, it needs to send the activation/deactivation retransmission indication information to the receiving end UE through the PC5.
  • step 402 the UE determines retransmission resources.
  • the UE may be in mode1 or mode2.
  • the UE requests retransmission resources from the gNB, and the gNB configures the PC5 retransmission resources for the UE.
  • the UE autonomously selects resources in the resource pool for retransmission.
  • the retransmission resource includes one or more retransmissions. After the UE obtains the retransmission resource, it needs to send indication information to the receiving end UE to indicate the retransmission resource and the number of retransmissions.
  • the indication information may be carried by Sidelink Control Information (SCI).
  • SCI Sidelink Control Information
  • the retransmission resource can be determined at the time of initial transmission (retransmission is activated), or when a negative response signal is received.
  • the retransmission resources include: time domain, frequency domain, and further include: retransmission and initial transmission and time interval, retransmission modulation and coding format, retransmission times, etc.
  • step S403 the UE retransmits the V2X data.
  • the retransmission is performed according to the response report information. If the response is "No", the V2X data is retransmitted; for multicast, there are multiple UEs at the receiving end, and if only one receiving end UE sends a negative response, the retransmission can be used Unicast or multicast; if more than one receiver UE sends a negative response, multicast is used for retransmission.
  • the time interval between the response signal and the corresponding Physical Sidelink Share Channel (PSSCH) data can be configured as a certain value, that is, the sending end UE is sending PSSCH data After that, the response signal is detected at a fixed time interval.
  • PSSCH Physical Sidelink Share Channel
  • the retransmission may be synchronous non-adaptive retransmission or asynchronous adaptive retransmission.
  • Synchronous non-adaptive retransmission refers to: retransmission and initial transmission are separated by a fixed time, and retransmission and initial transmission are sent using the same physical format (such as frequency domain resource location, modulation and coding method, etc.).
  • Asynchronous adaptive retransmission Retransmission and initial transmission adopt a configured time interval, and retransmission and initial transmission adopt different physical formats. The specific retransmission method needs to be specified when retransmission is activated. For asynchronous adaptive retransmission, parameters such as the time interval and the retransmission physical format are set by the gNB or the sending end UE.
  • Fig. 5 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for retransmitting PC5 data for a unicast scenario. As shown in FIG. 5, it mainly includes the following steps S501 to S505.
  • step S501 the UE unicasts the V2X service data through PC5.
  • the UE first obtains the transmission resources, such as through gNB (mode1) or autonomous selection (mode2), the UE may obtain the retransmission resources while obtaining the initial transmission resources.
  • the UE is the sending end UE, establishes a unicast link with the receiving end UE, sends V2X service resource indication information to the receiving end UE, and sends V2X service data on the resource. If the retransmission resource has been obtained, the sending end UE indicates the retransmission resource and the number of retransmissions to the receiving end UE.
  • step S502 the receiving end UE reports response information.
  • the receiving end UE receives the V2X data according to the indication information of the sending end UE, and if the UE can decode it correctly, it reports an "positive” response, otherwise it reports a "negative” response.
  • the report is sent through the PSFCH channel on the PC5 interface.
  • step S503 the sending end UE judges whether it is an affirmative response, and if it is an affirmative response, go to step S504; otherwise, go to step S505.
  • step S504 the sending end UE continues to send new V2X data.
  • the sending end UE If the sending end UE receives the positive response, it continues to send new V2X data. Before sending new V2X data, the sending end UE requests new V2X data sending resources. If the sending end UE has acquired the retransmission resources, the sending end UE sends indication information for releasing the retransmission resources, and the indication information can be sent to gNB (mode1) or broadcast through PC5.
  • step S505 the sending end UE retransmits the V2X data.
  • the sending end UE If the sending end UE receives a negative response, it retransmits the V2X data through the PC5 interface. If the sending end UE has obtained the PC5 retransmission resource, it retransmits the V2X data on the retransmission resource; otherwise, the sending end UE first obtains the retransmission resource, for example, through gNB configuration (mode1) or the UE independently selects the retransmission resource. Biography resources. Considering that V2X services generally have delay limitations, the number of retransmissions of V2X services also needs to be limited.
  • the sending end UE discards the corresponding V2X service.
  • the specific retransmission limit can be set or pre-configured by the upper layer.
  • Fig. 6 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for retransmitting PC5 data in a multicast scenario. As shown in FIG. 6, it mainly includes the following steps S601 to S605.
  • step S601 the sending end UE uses multicast to send V2X service data.
  • the sending end UE simultaneously multicasts and sends V2X service data to multiple receiving end UEs.
  • the multicast is similar to broadcast. Multiple receivers join a multicast group, and UEs at the sender send V2X service data on the multicast common channel. Only UEs that have joined the multicast group can receive corresponding V2X services. Similar to unicast retransmission, the sender UE can obtain multicast retransmission resources at the same time when acquiring multicast initial transmission resources.
  • step S602 the receiving end UE sends a response signal.
  • the number of the receiving end UE is more than one, considering that the same V2X data is sent by multicast, and as long as one receiving end UE sends a negative response, the sending end UE needs to retransmit the V2X data.
  • the number of Nack signals is less than the number of Ack signals, and only the Nack response signal can be sent, that is, the UE that correctly receives the V2X data may not send the response signal.
  • step S603 the sending end UE judges whether it is an affirmative response, if it is an affirmative response, go to step S604; otherwise, go to step S605.
  • the receiving of the negative response signal by the sending end UE indicates that the receiving end UE has not received the V2X service correctly. As long as the sending end UE receives a negative response signal, it can stop detecting and receiving other response signals.
  • step S604 the sending end UE uses multicast to send the new V2X service data.
  • the sending end UE obtains the multicast resource, notifies the receiving end UE (multicast resource) and sends new V2X service data.
  • step S605 the sender UE uses multicast to retransmit the V2X service data.
  • the sending end UE If the sending end UE has obtained the retransmission resource, the V2X service data is retransmitted on the retransmission resource; otherwise, the sending end UE obtains the retransmission resource, indicates the retransmission resource to the receiving end UE, and sends the V2X service data.
  • Fig. 7 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for configuring initial transmission and retransmission resources at the same time during mode 1 transmission. As shown in FIG. 7, it mainly includes the following steps S701 to S707.
  • step S701 gNB instructs to activate PC5 retransmission.
  • the gNB determines to activate the PC5 retransmission according to at least one of the following conditions: UE request, V2X service QoS, PC5 link status. For example, the UE requests PC5 retransmission and/or V2X service reliability requirements are high and/or PC5 link quality is poor, and the gNB determines to activate PC5 retransmission.
  • the gNB may send the indication through physical layer DCI signaling, MAC CE signaling, or RRC signaling.
  • step S702 the sending end UE requests the gNB for initial transmission and retransmission resources.
  • the UE at the sending end requests resources from the gNB through RRC signaling, and the gNB indicates resource information to the UE through RRC signaling.
  • the gNB can configure initial transmission and retransmission resources at the same time and notify the UE.
  • step S703 the sending end UE sends initial transmission resource location information and V2X service data.
  • the UE at the sending end sends the resource location through a Physical Sidelink Control Channel (PSCCH), and sends V2X data on the resource through a Physical Sidelink Share Channel (PSSCH).
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Share Channel
  • step S704 the receiving end UE sends a response signal.
  • the UE at the receiving end sends a response signal on the Physical Sidelink Feedback Channel (PSFCH).
  • PSFCH Physical Sidelink Feedback Channel
  • step S705 the sending end UE judges whether it is an affirmative response, and if it is an affirmative response, go to step S706; otherwise, go to step S707.
  • step S706 the sending end UE continues to send new V2X service data.
  • the sending end UE requests the gNB to release the retransmission resources obtained in step S702, and the gNB can use the retransmission resources for other V2X service transmission.
  • step S707 the sending end UE sends the retransmission resource location information, and retransmits the V2X service data on the retransmission resource.
  • the UE at the sending end has obtained the retransmission resource, sends the retransmission resource location information through the PSCCH, and retransmits the V2X service number through the PSSCH.
  • Fig. 8 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for retransmission according to the response configuration during mode1 transmission. As shown in FIG. 8, it mainly includes the following steps S801 to S807.
  • step S801 gNB instructs to activate PC5 retransmission.
  • step S701 This step is the same as step S701 in the foregoing embodiment, and will not be repeated here.
  • step S802 the sending end UE requests the gNB to transmit the PC5 resource of the V2X service initially and sends the V2X service data on the PC5 resource.
  • step S803 the receiving end UE sends a response signal.
  • step S804 the sending UE judges whether it is an affirmative response, and if it is an affirmative response, go to step S805; otherwise, go to step S806.
  • step S805 the sending end UE continues to send new V2X service data.
  • the sending end UE requests V2X service sending resources, indicates the resource location to the receiving end UE, and sends new V2X service data on the resources.
  • step S806 the sender UE requests retransmission resources from the gNB.
  • the UE at the sending end receives the negative response and uses RRC signaling to request retransmission of resources from the gNB, and the gNB instructs the retransmission of resource information through RRC signaling.
  • step S807 the sending end UE sends the retransmission resource location information and retransmits the V2X service data on the retransmission resource.
  • the retransmission location information also includes the number of retransmissions.
  • the transmitting end UE indicates the retransmission resource location information to the receiving end UE through the PSCCH, and retransmits the V2X service data through the PSSCH.
  • FIG. 9 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for simultaneously selecting initial transmission and retransmission resources during mode2 transmission. As shown in FIG. 9, it mainly includes the following steps S901 to S907.
  • step S901 PC5 retransmission is activated.
  • gNB determines to activate PC5 retransmission; for out-of-coverage scenarios, the sending end UE determines to activate PC5 retransmission, and the sending end UE V2X service QoS requirements and/or PC5 link status determine whether to activate PC5 retransmission.
  • step S902 the sending end UE selects initial transmission and retransmission resources.
  • step S903 the sending end UE instructs the initial transmission and retransmission resource location information and sends the V2X service data on the initial transmission resource.
  • the retransmission location information also includes the number of retransmissions.
  • step S904 the receiving end UE sends a response signal.
  • step S905 the sending end UE determines whether it is an affirmative response, and if it is an affirmative response, then go to step S906; otherwise, go to step S907.
  • step S906 the sending end UE continues to send new V2X data.
  • the sending end UE instructs to release retransmission resources.
  • the sending end UE broadcasts instructions to release retransmission resources on PC5, or instructs gNB to release retransmission resources.
  • step S907 the sending end UE retransmits the V2X data.
  • FIG. 10 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for the sending end UE to select retransmission resources after receiving a negative response signal during mode 2 transmission. As shown in FIG. 10, it mainly includes the following steps S1001 to S1008.
  • step S1001 PC5 retransmits activation. This step is the same as step S901 in the above step embodiment, and will not be described again.
  • step S1002 the sending end UE selects the initial transmission resource.
  • step S1003 the sending end UE instructs the initial transmission resource location information and sends the V2X service data on the initial transmission resource.
  • step S1004 the receiving end UE sends a response signal.
  • step S1005 the sending end UE judges whether it is an affirmative response, if it is an affirmative response, then go to step S1006; otherwise, go to step S1007.
  • step S1006 the sending end UE continues to send new V2X data.
  • step S1007 the sending end UE selects retransmission resources.
  • step S1008 the sender UE indicates the location of the retransmission resource and retransmits the V2X service on the retransmission resource.
  • FIG. 11 is a schematic flowchart of a method provided according to an embodiment of the present disclosure. This embodiment provides a method for activating/deactivating PC5 retransmission. As shown in FIG. 11, it mainly includes the following steps S1101 to S1106.
  • step S1101 the UE determines whether PC5 retransmission needs to be activated/deactivated, and if it needs to activate/deactivate PC5 retransmission, then go to step S1102; otherwise, go to step S1106.
  • the UE determines whether the PC5 retransmission needs to be activated/deactivated according to at least one of the QoS requirements of the V2X service to be sent, the PC5 link status, and the PC5 retransmission status.
  • the PC5 retransmission status includes active or inactive. If the PC5 retransmission is activated, it can continue to be activated or deactivated; if the PC5 retransmission is not activated, it can be activated or remain inactivated. That is, it is determined in step S1101 whether the PC5 retransmission state needs to be changed.
  • step S1102 the UE determines whether it is in coverage, and if it is in coverage, then go to step S1103; otherwise, go to step S1105.
  • step S1103 the UE sends an activation/deactivation PC5 retransmission request to the gNB. That is, the UE sends a request to change the retransmission state of PC5 to the gNB.
  • step S1104 the gNB determines to activate/deactivate retransmission and notify the UE.
  • the gNB determines to activate/deactivate the PC5 to retransmit.
  • step S1105 the UE activates/deactivates retransmission and notifies the receiving end UE. That is, the UE changes the PC5 retransmission state by itself.
  • the sending end UE determines to activate/deactivate the PC5 to retransmit.
  • step S1106 the UE continues to send the V2X service using the existing transmission mode. If the UE determines in step S1101 that it does not need to activate/deactivate PC5 retransmission (that is, the PC5 retransmission status is not changed), it continues to send the V2X service in the existing way, that is, if the existing PC5 retransmission is already activated, continue Using PC5 retransmission, if the existing PC5 retransmission is not activated, the PC5 retransmission is not activated.
  • the method according to the above embodiment can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is Better implementation.
  • the technical solution of the present disclosure essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The optical disc) includes several instructions to enable a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the method described in each embodiment of the present disclosure.
  • an information transmission device is also provided, and the device is used to implement the above-mentioned embodiments and implementation modes, and those that have been described will not be repeated.
  • the term "module” can implement a combination of software and/or hardware with predetermined functions.
  • the devices described in the following embodiments are preferably implemented by software, hardware or a combination of software and hardware is also possible and conceived.
  • Fig. 12 is a structural block diagram of an information transmission device according to an embodiment of the present disclosure.
  • the information transmission device is a sending-side terminal or a terminal located at the sending-side. As shown in FIG. 12, the device includes a confirmation module 100 and a retransmission module 200.
  • the confirmation module 100 is used to confirm activation/deactivation of the HARQ retransmission of the PC5.
  • the retransmission module 200 is configured to retransmit the V2X service data to the receiving terminal through the PC5 according to the negative response information of the receiving terminal.
  • each of the above modules can be implemented by software or hardware.
  • it can be implemented in the following manner, but not limited to this: the above modules are all located in the same processor; or, the above modules are combined in any combination The forms are located in different processors.
  • the embodiment of the present disclosure also provides a system for transmitting a response signal.
  • the system of this embodiment includes a wireless access network device 801 and a terminal 802.
  • the function division of the modules is different from the previous embodiment.
  • the radio access network device 801 includes a base station 8011.
  • the terminal 802 includes a communication module 8021 and other modules 8022.
  • the communication module 8021 is used to receive the retransmission indication information sent or pre-configured by the base station 8011 or other modules 8022, and is also used to receive the V2X service data that is initially transmitted or retransmitted.
  • the communication module 8021 of the terminal 802 is also used for determining activation/deactivation of retransmission, determining retransmission resources, and determining the response signal.
  • the communication module 8021 of the terminal 802 is also used to send response signals, send activation/deactivation retransmission indication information, send initial transmission and retransmission resource location information, and initial transmission and retransmission of V2X service data.
  • modules 8022 include: power supply module, radio frequency module, baseband module, display module, audio/video module, navigation module, storage module, etc. These modules are used to implement functions related to V2X communication.
  • the base station 8011 is configured to send resource configuration information to the terminal 802 in mode 1 and receive information reported by the UE.
  • the embodiments of the present disclosure also provide a storage medium in which a computer program is stored, and when the computer program is run by a processor, the processor causes the processor to execute the information transmission method according to each embodiment of the present disclosure.
  • the foregoing storage medium may include, but is not limited to: U disk, Read-Only Memory (Read-Only Memory, ROM for short), Random Access Memory (Random Access Memory, RAM for short), Various media that can store computer programs, such as mobile hard disks, magnetic disks, or optical disks.
  • the embodiments of the present disclosure also provide an electronic device including a memory and a processor, the memory stores a computer program, and the processor executes the information transmission method according to each embodiment of the present disclosure when the computer program is running.
  • the design for the retransmission of V2X service data is realized, which guarantees the requirement for retransmission of PC5 under different V2X service QoS requirements and PC5 link status, and improves the reliability of V2X service. Ensure the effective use of PC5 resources.
  • modules or steps of the present disclosure can be implemented by a general computing device, and they can be concentrated on a single computing device or distributed in a network composed of multiple computing devices.
  • they can be implemented with program codes executable by the computing device, so that they can be stored in the storage device for execution by the computing device, and in some cases, can be executed in a different order than here.

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Abstract

本公开提供了一种信息传输方法及装置、一种存储介质和一种电子装置。所述方法包括：发送侧终端确认激活/去激活PC5的HARQ重传；以及所述发送侧终端根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。

Description

信息传输方法及装置 技术领域
本公开涉及但不限于通信领域。
背景技术
随着经济社会高速发展，汽车保有量迅速增长，道路交通事故频繁发生，已成为近年来影响公众安全感的重要因素之一，道路交通安全问题已经成为影响社会和谐和改善民生的基本问题之一。提升车辆安全设计是其中的重要组成部分。
基于通信的碰撞预警***，通过利用先进的无线通信技术和新一代信息处理技术，实现车与车、车与路侧基础设施间的实时信息交互，告知彼此目前的状态(包括车辆的位置、速度、加速度、行驶路径)及获知的道路环境信息，协作感知道路危险状况，及时提供多种碰撞预警信息，防止道路交通安全事故的发生，成为当前各国试图解决道路交通安全问题的一种新的思路。
发明内容
根据本公开的一个实施例，提供了一种信息传输方法，包括：发送侧终端确认激活/去激活PC5的混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)重传；以及所述发送侧终端根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。
根据本公开的另一个实施例，提供了一种信息传输装置，包括：确认模块，用于确认激活/去激活PC5的HARQ重传；以及重传模块，用于根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。
根据本公开的又一个实施例，还提供了一种存储介质，所述存储介质中存储有计算机程序，所述计算机程序被处理器运行时，使得所述处理器执行根据本公开的信息传输方法。
根据本公开的又一个实施例，还提供了一种电子装置，包括存储器和处理器，所述存储器中存储有计算机程序，所述处理器运行所述计算机程序时执行根据本公开的信息传输方法。
附图说明
此处所说明的附图用来提供对本公开的进一步理解，构成本申请的一部分，本公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1是根据相关技术的车联网示意图；
图2是根据相关技术的通过PC5接口传输V2X业务架构示意图；
图3是根据本公开实施例的信息传输方法流程图；
图4是根据本公开实施例的信息传输方法流程图；
图5至图11是根据本公开各实施例的流程图；
图12是根据本***息传输装置的模块结构框图；以及
图13是根据本公开实施例的***结构示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本公开。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本公开的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
车联网(Vehicle to everything，V2X)是指通过装载在车辆上的传感器、车载终端及电子标签提供车辆信息，采用各种通信技术实现车与车(Vehicle to Vehicle，V2V)、车与人(Vehicle to Pedestrian，V2P)、车与路(基础设施)(Vehicle to Infrastructure，V2I)互连互通，并在信息网络平台上对信息进行提取、共享等有效利用，对车辆进行有效的管控和提供综合服务。
图1示出了车联网的示意图。
近年来随着新的移动通信技术的发展，国际上出现了使用长期演进(Long Term Evolution，LTE)和5G NR(New Radio)技术来解决基于V2X通信应用的研究。
路边通信单元(Road Side Unit，RSU)可以接收车辆请求，保证车辆接入互联网，具有网关的功能；此外，RSU也具有数据运算、存储、转发的功能。
目前有两种V2X实现技术：专用短距离通信(Dedicated Short Range Communication，DSRC)和蜂窝网V2X。DSRC基于IEEE 802.11P和IEEE 1609系列标准，802.11P负责物理层和媒体接入控制(Medium Access Control，MAC)技术，1609负责上层规范。基于蜂窝网5G NR的V2X技术刚开始讨论，目前还没有标准。
目前3GPP正在讨论的NR V2X技术包括：V2X可能通过PC5接口或Uu接口实现。PC5接口是指设备到设备(Device to Device，D2D)的空中接口，Uu接口是指用户设备(User Equipment，UE)到基站(gNB)的空中接口。
通过PC5接口发送V2X业务的***架构如图2所示。
NR V2X支持单播(unicast)、组播(groupcast)和广播(broadcast)传输，所有三种传输都可在覆盖内、部分覆盖内或覆盖外实现。NR V2X传输模式包括mode1和mode2。mode1是指由gNB配置传输V2X业务的PC5资源，mode2是指UE自主选择传输V2X业务的PC5资源。
在NR V2X中，最高的可靠性要求是99.999％，最小的延时要求为3ms，NR V2X在PC5接口采用重传来解决可靠性问题。为了实现传输，采用接收端UE发送应答信号到发送端UE，应答信号用于指示是否正确接收解码V2X消息，根据应答信号指示，发送端可以重传V2X消息。为了传输应答信号，设计了专用的物理信道，即，物理边路反馈信道(Physical Sidelink Feedback CHannel，PSFCH)。
在3GPP正在研究的NR V2X课题中，HARQ重传用于提高V2X业务的可靠性，但HARQ重传的实现方案还未确定，例如，如何激活或去激活HARQ重传，以及如何确定HARQ重传资源等都还没有结论。
下面对本公开方法实施例所运行的装置进行说明，在本公开的实施例中，所示涉及的装置主要包括终端装置和接入网装置。
在本公开的实施例中，终端装置可包括以下至少一种：车载单元(On board Unit，OBU)、路边单元(Road Side Unit，RSU)、用户设备(User Equipment，UE)、V-UE、P-UE、可穿戴设备(Wearables)、UE到网络中继(UE-to-network relay)、物联网/人工半自动收费车道(Internet of Things，IoT/Manual Toll Collection，MTC)终端。如无特殊说明，本公开实施例中出现的UE代表上述终端装置的一种或几种。
为了便于描述，本公开实施例中的V-UE是指Vehicle-UE，P-UE是指Pedestrian-UE。PC5和SideLink具有相同的含义，都用于指示UE之间的空口链路。
终端装置根据gNB指示或预配置规则确定是否激活/去激活PC5的HARQ重传，当激活PC5的HARQ重传时，UE根据gNB配置的或自主选择初传和重传资源，并根据收到的PSFCH信号确定是否发送重传数据。
接入网装置为基站，包括以下之一：eNB，gNB。接入网装置主要负责：为终端装置配置PSFCH资源和HARQ重传资源，指示终端装置激活/去激活HARQ重传。
在本实施例中提供了一种运行于上述装置的信息传输方法，图3是根据本公开实施例的信息传输方法的流程图，如图3所示，该流程包括如下步骤S302至S304。
在步骤S302，发送侧终端确认激活/去激活PC5的HARQ重传。
在步骤S304，所述发送侧终端根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。
在本实施例中，所述激活/去激活HARQ重传可以由基站配置或预配置。基站配置是指：发送端UE向基站发送指示信息，基站根据指示信息配置激活/去激活重传。所述指示信息包括V2X业务的属性(其中包括时延要求、可靠性要求等)以及PC5链路状态。所述PC5链路状态包括链路质量、拥塞程度等。可以通过对PC5信道上传输的 参考信号进行测量获得所述链路质量，例如，PC5接口的链路质量为对PC5接口的解调参考信号(DeModulation Reference Signal，DMRS)的测量结果。所述拥塞程度可用信道忙率(Channel Busy Rate，CBR)表示。例如，V2X业务要求高可靠，而PC5链路质量差，则基站激活HARQ重传。
在本实施例中，所述应答信息包括以下之一：肯定，否定。如果收到否定应答，则发送端UE向基站发送请求消息，所述请求消息用于请求PC5重传资源；
在一实施例中，为了减少处理时延，当重传已激活，所述重传资源(还包括重传次数)可以在初传时由基站配置好并通知发送端UE，或者由发送端UE预约，然后发送端UE通知接收端UE。当收到否定应答信号时，发送端UE重传V2X数据；当收到肯定应答信号时，所述重传资源可用于其他UE。
在本实施例中，PC5通信包括同频或异频。同频是指Uu和PC5通信共享频率；异频是指PC5通信采用专用频率，如5.9GHz V2X频率。
在本公开的实施例中，所述PC5是指UE之间的接口，也可以采用其他名称表示(如SideLink)。PC5接口可采用授权频谱或非授权频谱的Prose技术。
下面以UE作为终端设备为例，对本公开所提供的重传方案进行进一步详细描述，如图4所示，包括如下主要步骤S401至S403。
在步骤S401，UE确认激活/去激活HARQ重传。
UE可处于mode1或mode2。对于采用mode1的UE，首先，根据上层V2X业务的服务质量(Quality of Service，QoS)属性、PC5链路状态、重传激活状态中的至少一者，判断是否需要激活重传。所述V2X业务的QoS属性包括以下至少之一：时延，可靠性，通信距离。PC5链路状态用于指示PC5链路质量或拥塞程度。重传激活状态可包括：激活，或未激活。如果当前激活状态为激活，则UE判断是否保持激活或去激活重传；否则，UE判断是否激活重传。例如：V2X业务可靠性要求高，PC5链路质量差，重传未激活，则UE初步确认需要 激活重传。
其次，所述UE向基站gNB发送指示信息，用于指示激活PC5重传的请求。所述指示信息可通过PUCCH/PUSCH传输，可采用调度请求(Scheduling Request，SR)、缓存状态报告(Buffer Status Report，BSR)或确认(Acknowledgement，Ack)/否定性确认(Negative Acknowledgement，Nack)等承载。
再次，gNB根据收到的指示信息、网络状态和运营商策略等综合确定是否激活重传。如果确定激活重传，则gNB向UE发送激活重传指示信息；否则，gNB向UE发送去激活(不激活)重传指示信息。所述gNB可采用以下之一向UE指示激活重传：物理层下行控制信息(Downlink Control Information，DCI)信令、媒体接入控制(Media Access Control，MAC)控制单元(control element，CE)信令或无线资源控制(Radio Resource Control，RRC)信令。
需要指出的是，即使gNB没有收到UE的请求消息，gNB也可确定激活/去激活PC5重传，并通知UE。所述UE为RRC-Connected模式。
对于mode2的UE，所述UE采用预配置规则判断是否需要激活/去激活PC5重传，所述预配置规则存储在UE的内部，并且包括V2X业务的QoS门限和/或PC5链路状态门限。例如，当V2X业务可靠性要求超过QoS门限和/或PC5链路质量低于链路状态门限时，UE可确定激活重传。
所述UE确认激活/去激活重传后，需要通过PC5向接收端UE发送激活/去激活重传的指示信息。
在步骤402，UE确定重传资源。
所述UE可处于mode1或mode2。对于mode1的UE，所述UE向gNB请求重传资源，gNB为UE配置PC5重传资源。对于mode2的UE，所述UE自主选择资源池中的资源用于重传。所述重传资源包括用于一次或多次的重传。所述UE获得重传资源后，需要向接收端UE发送指示信息，以指示重传资源和重传次数。所述指示信息可通过边路控制信息(Sidelink Control Information，SCI)承载。
需要指出的是：所述重传资源可以在初传时确定(重传已激活)，或者在收到否定应答信号时确定。
所述重传资源包括：时域，频域，进一步还包括：重传和初传和时间间隔、重传的调制编码格式、重传次数等。
在步骤S403，UE重传V2X数据。
所述重传根据应答上报信息进行，如应答为“否定”时，则重传V2X数据；针对组播，接收端有多个UE，如果只有一个接收端UE发送否定应答，则重传可采用单播或多播；如果有一个以上接收端UE发送否定应答，则重传采用多播。
为了减少发送端UE的等待时延，可以配置应答信号和相应的物理边路共享信道(Physical Sidelink Share Channel，PSSCH)数据之间的时间间隔为确定数值，即，发送端UE在发送了PSSCH数据后间隔固定的时间检测接收应答信号。
所述重传可以是同步非自适应重传或异步自适应重传。同步非自适应重传是指：重传和初传间隔固定时间，重传和初传采用相同的物理格式(如频域资源位置、调制编码方式等)发送。异步自适应重传：重传和初传采用配置的时间间隔，重传和初传采用不同的物理格式。具体采用哪一种重传方式需要在激活重传时指定，对于异步自适应重传，由gNB或发送端UE设置时间间隔、重传物理格式等参数。
下面通过各个实施例对本公开适用的不同场景进行具体描述。
图5为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种针对单播场景重传PC5数据的方法。如图5所示，主要包括如下步骤S501至S505。
在步骤S501，UE通过PC5单播发送V2X业务数据。
所述UE首先获取发送资源，如通过gNB获取(mode1)或自主选择获取(mode2)，所述UE获取初传资源的同时可获取重传资源。所述UE为发送端UE，与接收端UE建立单播链接，向接收端UE发送V2X业务资源指示信息并在所述资源上发送V2X业务数据。如果已获取重传资源，则所述发送端UE向接收端UE指示重传资源和重传次数。
在步骤S502，接收端UE上报应答信息。
所述接收端UE根据发送端UE的指示信息接收V2X数据，如果UE能够正确解码，则上报“肯定”应答，否则上报“否定”应答。所述上报通过PC5接口上的PSFCH信道发送。
在步骤S503，发送端UE判断是否为肯定应答，如果是肯定应答，则转向步骤S504；否则，转向步骤S505。
在步骤S504，发送端UE继续发送新的V2X数据。
如果发送端UE收到肯定应答，则继续发送新的V2X数据。在发送新的V2X数据之前，所述发送端UE请求新的V2X数据发送资源。如果发送端UE已获取重传资源，则所述发送端UE发送释放重传资源的指示信息，所述指示信息可发给gNB(mode1)或通过PC5广播。
在步骤S505，发送端UE重传V2X数据。
如果发送端UE收到否定应答，则通过PC5接口重传V2X数据。如果所述发送端UE已获取PC5重传资源，则在重传资源上重传V2X数据；否则，所述发送端UE先获取重传资源，例如，通过gNB配置(mode1)或UE自主选择重传资源。考虑到V2X业务一般存在时延限制，重传V2X业务的次数也需要限制。如根据V2X业务的时延需求限制重传次数为3次，并且3次重传后接收端UE仍未正确接收，则发送端UE丢弃相应的V2X业务。具体的重传次数限制可由上层设置或预配置。
图6为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种多播场景中重传PC5数据的方法。如图6所示，主要包括如下步骤S601至S605。
在步骤S601，发送端UE采用多播发送V2X业务数据。
所述发送端UE向多个接收端UE同时组播发送V2X业务数据。所述多播类似于广播，多个接收端加入一个多播组中，发送端UE在多播公共信道上发送V2X业务数据，只有加入了多播组的UE可以接收相应的V2X业务。与单播重传类似，发送端UE在获取多播初传资源时可同时获取多播重传资源。
在步骤S602，接收端UE发送应答信号。
所述接收端UE的数量多于一个，考虑到多播发送的是相同V2X 数据，而且只要有一个接收端UE发送否定应答，发送端UE都需要重传V2X数据。一般Nack信号数量要小于Ack信号数量，可以只发送Nack应答信号，即，正确接收到V2X数据的UE可不发送应答信号。
在步骤S603，发送端UE判断是否为肯定应答，如果是肯定应答，则转向步骤S604；否则转向步骤S605。
所述发送端UE收到否定应答信号，说明存在接收端UE没有正确接收V2X业务，只要所述发送端UE收到一个否定应答信号，即可停止检测接收其他的应答信号。
在步骤S604，发送端UE采用多播发送新的V2X业务数据。
所述发送端UE获取多播资源，通知接收端UE(多播资源)并发送新的V2X业务数据。
在步骤S605，发送端UE采用多播重传V2X业务数据。
如果所述发送端UE已获取重传资源，则在重传资源上重传V2X业务数据，否则所述发送端UE获取重传资源，向接收端UE指示重传资源并发送V2X业务数据。
图7为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种mode1传输时，同时配置初传和重传资源的方法。如图7所示，主要包括如下步骤S701至S707。
在步骤S701，gNB指示激活PC5重传。
gNB根据以下条件至少之一确定激活PC5重传：UE请求、V2X业务QoS、PC5链路状态。例如，UE请求PC5重传和/或V2X业务可靠性要求高和/或PC5链路质量差，所述gNB确定激活PC5重传。所述gNB可通过物理层DCI信令、MAC CE信令或者RRC信令发送所述指示。
在步骤S702，发送端UE向gNB请求初传和重传资源。
发送端UE通过RRC信令向gNB请求资源，所述gNB通过RRC信令向所述UE指示资源信息。
需要指出的是，即使发送端UE没有向gNB请求重传资源，所述gNB可以同时配置初传和重传资源并通知所述UE。
在步骤S703，发送端UE发送初传资源位置信息和V2X业务数据。
发送端UE通过物理边路控制信道(Physical Sidelink Control Channel，PSCCH)发送资源位置，并通过物理边路共享信道(Physical Sidelink Share Channel，PSSCH)在所述资源上发送V2X数据。
在步骤S704，接收端UE发送应答信号。接收端UE在物理边路反馈信道(Physical Sidelink Feedback CHannel，PSFCH)上发送应答信号。
在步骤S705，发送端UE判断是否为肯定应答，如果是肯定应答，则转向步骤S706；否则，转向步骤S707。
在步骤S706，发送端UE继续发送新的V2X业务数据。
进一步的，发送端UE向gNB请求释放步骤S702中得到的重传资源，gNB可将该重传资源用於其他V2X业务传输。
在步骤S707，发送端UE发送重传资源位置信息，并在重传资源上重传V2X业务数据。
发送端UE已获取重传资源，通过PSCCH发送重传资源位置信息，并通过PSSCH重传V2X业务数。
图8为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种mode1传输时，根据应答配置重传的方法。如图8所示，主要包括如下步骤S801至S807。
在步骤S801，gNB指示激活PC5重传。
本步骤与上述实施例中的步骤S701相同，这里不再赘述。
在步骤S802，发送端UE向gNB请求初传V2X业务的PC5资源并在PC5资源上发送V2X业务数据。
在步骤S803，接收端UE发送应答信号。
在步骤S804，发送UE判断是否为肯定应答，如果是肯定应答，则转向步骤S805；否则，转向步骤S806。
在步骤S805，发送端UE继续发送新的V2X业务数据。
发送端UE请求V2X业务发送资源，向接收端UE指示资源位置并在所述资源上发送新的V2X业务数据。
在步骤S806，发送端UE向gNB请求重传资源。
发送端UE收到否定应答，采用RRC信令向所述gNB请求重传资 源，所述gNB通过RRC信令指示重传资源信息。
在步骤S807，发送端UE发送重传资源位置信息并在重传资源上重发V2X业务数据。重传位置信息还包括重传次数。所述发送端UE通过PSCCH向接收端UE指示重传资源位置信息，并通过PSSCH重传V2X业务数据。
图9为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种mode2传输时，同时选择初传和重传资源的方法。如图9所示，主要包括如下步骤S901至S907。
在步骤S901，PC5重传激活。
针对覆盖内(至少发送端UE位于覆盖内)场景，与步骤S701/S801类似，由gNB确定激活PC5重传；针对覆盖外场景，由发送端UE确定激活PC5重传，所述发送端UE根据V2X业务QoS需求和/或PC5链路状态确定是否激活PC5重传。
在步骤S902，发送端UE选择初传和重传资源。
在步骤S903，发送端UE指示初传和重传资源位置信息并在初传资源上发送V2X业务数据。重传位置信息还包括重传次数。
在步骤S904，接收端UE发送应答信号。
在步骤S905，发送端UE判断是否为肯定应答，如果是肯定应答，则转向步骤S906；否则，转向步骤S907。
在步骤S906，发送端UE继续发送新的V2X数据。
在一实施例中，发送端UE指示释放重传资源。所述发送端UE在PC5广播指示释放重传资源，或者向gNB指示释放重传资源。
在步骤S907，发送端UE重传V2X数据。
图10为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种mode2传输时，发送端UE收到否定应答信号后选择重传资源的方法。如图10所示，主要包括如下步骤S1001至S1008。
在步骤S1001，PC5重传激活。该步骤与上述步骤实施例中的步骤S901相同，不再赘述。
在步骤S1002，发送端UE选择初传资源。
在步骤S1003，发送端UE指示初传资源位置信息并在初传资源 上发送V2X业务数据。
在步骤S1004，接收端UE发送应答信号。
在步骤S1005，发送端UE判断是否为肯定应答，如果是肯定应答，则转向步骤S1006；否则，转向步骤S1007。
在步骤S1006，发送端UE继续发送新的V2X数据。
在步骤S1007，发送端UE选择重传资源。
在步骤S1008，发送端UE指示重传资源位置并在重传资源上重传V2X业务。
图11为根据本公开实施例提供的方法的流程示意图。本实施例提供了一种激活/去激活PC5重传的方法。如图11所示，主要包括如下步骤S1101至S1106。
在步骤S1101，UE判断是否需要激活/去激活PC5重传，如果需要激活/去激活PC5重传，则转向步骤S1102；否则，转向步骤S1106。
UE根据待发送V2X业务的QoS要求、PC5链路状态、PC5重传状态中的至少一者确定是否需要激活/去激活PC5重传。PC5重传状态包括激活或者未激活。如果PC5重传已激活，则可以继续保持激活或去激活；如果PC5重传未激活，则可以激活或者保持不激活。即，在步骤S1101确定是否需要改变PC5重传状态。
在步骤S1102，UE判断是否为覆盖内，如果是覆盖内，则转向步骤S1103；否则，转向步骤S1105。
在步骤S1103，UE向gNB发送激活/去激活PC5重传请求。即，UE向gNB发送改变PC5重传状态的请求。
在步骤S1104，gNB确定激活/去激活重传并通知UE。
当发送端UE位于覆盖内时，由gNB确定激活/去激活PC5重传。
在步骤S1105，UE激活/去激活重传，并通知接收端UE。即，UE自行改变PC5重传状态。
当发送端UE位于覆盖外时，由发送端UE确定激活/去激活PC5重传。
在步骤S1106，UE采用现有传输方式继续发送V2X业务。如果UE在步骤S1101确定不需要激活/去激活PC5重传(即，不改变PC5 重传状态)，则继续采用现有的方式发送V2X业务，即，如果现有已激活PC5重传，则继续采用PC5重传，如果现有未激活PC5重传，则不激活PC5重传。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本公开各个实施例所述的方法。
在本实施例中还提供了一种信息传输装置，该装置用于实现上述实施例和实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图12是根据本公开实施例的信息传输装置的结构框图。该信息传输装置为发送侧终端或位于发送侧终端。如图12所示，该装置包括确认模块100和重传模块200。
确认模块100用于确认激活/去激活PC5的HARQ重传。重传模块200用于根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
本公开实施例还提供了一种传输应答信号的***。如图13所示，本实施例的***包括无线接入网装置801和终端802。在本实施例中，模块的功能划分与前文的实施例有所不同。
无线接入网装置801包括基站8011。终端802包括通信模块8021 和其他模块8022。通信模块8021用于接收基站8011或其他模块8022发送的或预配置的重传指示信息，还用于接收初传或重传的V2X业务数据。终端802的通信模块8021还用于确定激活/去激活重传，确定重传资源，以及确定应答信号。终端802的通信模块8021还用于发送应答信号，发送激活/去激活重传指示信息，发送初传和重传资源位置信息，以及初传和重传V2X业务数据。其他模块8022包括：供电模块、射频模块、基带模块、显示模块、音频/视频模块、导航模块、存储模块等。这些模块用于实现与V2X通信相关的功能。基站8011用于在mode1时向终端802发送资源配置信息，接收UE的上报信息。
本公开的实施例还提供了一种存储介质，该存储介质中存储有计算机程序，该计算机程序被处理器运行时，使得所述处理器执行根据本公开各实施例的信息传输方法。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、移动硬盘、磁碟或者光盘等各种可以存储计算机程序的介质。
本公开的实施例还提供了一种电子装置，包括存储器和处理器，该存储器中存储有计算机程序，该处理器运行计算机程序时执行根据本公开各实施例的信息传输方法。
根据本公开的各实施例，实现了针对V2X业务数据重传的设计，保证了在不同V2X业务QoS要求和PC5链路状态下，对于PC5重传发送的需求，提高了V2X业务的可靠性，保证了PC5资源的有效利用。
显然，本领域的技术人员应该明白，上述的本公开的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实 现。这样，本公开不限制于任何特定的硬件和软件结合。
以上所述仅为本公开的实施例而已，并不用于限制本公开，对于本领域的技术人员来说，本公开可以有各种更改和变化。凡在本公开的原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (23)

  1. 一种信息传输方法，包括：
    发送侧终端确认激活/去激活PC5的混合自动重传请求HARQ重传；以及
    所述发送侧终端根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。
  2. 根据权利要求1所述的方法，其中，发送侧终端确认激活/去激活PC5的HARQ重传的步骤包括：
    所述发送侧终端根据以下信息中的至少之一确定是否需要激活/去激活PC5的HARQ重传：V2X业务的属性、PC5链路状态、重传激活状态。
  3. 根据权利要求1所述的方法，其中，发送侧终端确认激活/去激活PC5的HARQ重传的步骤包括：
    所述发送侧终端向基站发送指示信息，所述指示信息包括以下至少之一：V2X业务的属性、PC5链路状态、重传激活状态；
    基站根据所述指示信息为所述发送侧终端配置激活/去激活PC5的HARQ重传；以及
    所述发送侧终端根据基站配置信息向接收侧终端指示PC5重传激活状态。
  4. 根据权利要求1所述的方法，其中，在所述发送侧终端向所述接收侧终端重传V2X业务数据的步骤之前，所述方法还包括：
    所述发送侧终端向所述接收侧终端发送V2X业务数据；以及
    所述发送侧终端在物理边路反馈信道PSFCH上接收所述接收侧终端发送的应答信息。
  5. 根据权利要求1所述的方法，其中，发送侧终端确认激活/ 去激活PC5的HARQ重传的步骤包括：
    响应于所述发送侧终端确认激活PC5重传，在向所述接收侧终端初次发送V2X业务数据的资源配置信息时，指示PC5重传资源配置信息。
  6. 根据权利要求1所述的方法，其中，在所述发送侧终端向所述接收侧终端重传V2X业务数据的步骤之前，所述方法还包括：
    所述发送侧终端确定用于重传V2X业务数据的PC5重传资源配置信息；以及
    在所述发送侧终端确定PC5重传资源配置信息后，向所述接收侧终端发送重传资源指示信息，其中，所述重传资源指示信息包括重传资源和重传次数。
  7. 根据权利要求6所述的方法，其中，所述发送侧终端确定PC5重传资源的步骤包括：
    所述发送侧终端向所述基站请求PC5重传资源，所述基站为所述发送侧终端配置PC5重传资源；或
    所述发送侧终端从配置资源池中选择PC5重传资源。
  8. 根据权利要求6所述的方法，其中，所述重传资源包括：重传时域、重传频域、重传与初传的时间间隔和重传的调制编码格式。
  9. 根据权利要求1所述的方法，其中，所述发送侧终端采用异步自适应重传或者同步非自适应重传通过PC5向所述接收侧终端重传V2X业务数据。
  10. 根据权利要求1所述的方法，其中，所述发送侧终端或所述接收侧终端包括以下之一：车载单元OBU、路边单元RSU、用户设备UE、V-UE、P-UE、可穿戴设备、UE到网络中继、IoT/MTC终端。
  11. 根据权利要求1所述的方法，其中，所述接收侧终端包括多个接收侧终端，所述发送侧终端通过多播或广播向所述多个接收侧终端重传V2X业务数据。
  12. 一种信息传输装置，位于发送侧终端，包括：
    确认模块，用于确认激活/去激活PC5的HARQ重传；以及
    重传模块，用于根据接收侧终端的否定应答信息通过PC5向所述接收侧终端重传V2X业务数据。
  13. 根据权利要求12所述的装置，其中，所述确认模块包括：
    第一确认单元，用于根据以下信息中的至少之一确定是否需要激活/去激活PC5的HARQ重传：V2X业务的属性、PC5链路状态、重传激活状态。
  14. 根据权利要求12所述的装置，其中，所述确认模块包括：
    第二确认单元，用于向基站发送指示信息，所述指示信息包括以下至少之一：V2X业务的属性、PC5链路状态、重传激活状态；
    指示单元，用于根据基站配置信息向接收侧终端指示PC5重传激活状态，其中
    所述基站根据所述指示信息为所述发送侧终端配置激活/去激活PC5的HARQ重传。
  15. 根据权利要求12所述的装置，还包括：
    发送模块，用于向所述接收侧终端发送V2X业务数据和PC5重传激活状态信息；以及
    接收模块，用于在物理边路反馈信道PSFCH上接收所述接收侧终端发送的应答信息。
  16. 根据权利要求12所述的装置，其中，
    所述重传模块还用于响应于确认激活PC5重传，在向所述接收 侧终端初次发送V2X业务数据的资源配置信息时，指示PC5重传资源配置信息。
  17. 根据权利要求12所述的装置，还包括：
    资源确定模块，用于确定用于重传V2X业务数据的PC5重传资源配置信息，并且
    所述重传模块还用于在确定PC5重传资源配置信息后，向所述接收侧终端发送重传资源指示信息，其中，所述重传资源指示信息包括重传资源和重传次数。
  18. 根据权利要求17所述的装置，其中，所述资源确定模块包括：
    资源请求单元，用于向所述基站请求PC5重传资源，以由所述基站为所述发送侧终端配置PC5重传资源；或
    资源选择单元，用于从配置资源池中选择PC5重传资源。
  19. 根据权利要求12所述的装置，其中，所述重传模块采用异步自适应重传或者同步非自适应重传通过PC5向所述接收侧终端重传V2X业务数据。
  20. 根据权利要求12所述的装置，其中，所述发送侧终端或所述接收侧终端包括以下之一：车载单元OBU、路边单元RSU、用户设备UE、V-UE、P-UE、可穿戴设备、UE到网络中继、IoT/MTC终端。
  21. 根据权利要求12所述的装置，其中，所述接收侧终端包括多个接收侧终端，所述重传模块通过多播或广播向所述多个接收侧终端重传V2X业务数据。
  22. 一种存储介质，其上存储有计算机程序，其中，所述计算机程序被处理器运行时，使得所述处理器执行根据权利要求1至11 中任一项所述的方法。
  23. 一种电子装置，包括存储器和处理器，其中，所述存储器中存储有计算机程序，所述处理器运行所述计算机程序时执行根据权利要求1至11中任一项所述的方法。
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