WO2021134799A1 - 车联网系统中资源选择的方法、装置、终端和介质 - Google Patents

车联网系统中资源选择的方法、装置、终端和介质 Download PDF

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Publication number
WO2021134799A1
WO2021134799A1 PCT/CN2020/070338 CN2020070338W WO2021134799A1 WO 2021134799 A1 WO2021134799 A1 WO 2021134799A1 CN 2020070338 W CN2020070338 W CN 2020070338W WO 2021134799 A1 WO2021134799 A1 WO 2021134799A1
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WIPO (PCT)
Prior art keywords
resource
time
window
retransmission
service
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PCT/CN2020/070338
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English (en)
French (fr)
Inventor
丁伊
赵振山
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to AU2020418632A priority Critical patent/AU2020418632A1/en
Priority to KR1020227009471A priority patent/KR20220122968A/ko
Priority to EP20909747.6A priority patent/EP4002948B1/en
Priority to CN202080051833.4A priority patent/CN114145068A/zh
Priority to BR112022006086A priority patent/BR112022006086A2/pt
Priority to PCT/CN2020/070338 priority patent/WO2021134799A1/zh
Priority to CN202210290260.1A priority patent/CN114567935B/zh
Priority to JP2022516768A priority patent/JP7467609B2/ja
Publication of WO2021134799A1 publication Critical patent/WO2021134799A1/zh
Priority to US17/678,531 priority patent/US20220191837A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • 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
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • This application relates to the field of wireless communication, and in particular to a method, device, terminal, and medium for resource selection in an Internet of Vehicles system.
  • the terminal In a transmission mode of SL, the terminal needs to select resources in the resource pool.
  • the terminal determines the resource selection window and the resource listening window, and according to the listening result of the resource listening window, excludes the resources in the resource selection window to obtain candidate resources of the service to be transmitted.
  • the terminal randomly selects the resource among the candidate resources to transmit the service to another terminal receiving the service, including the initial transmission and retransmission of the service.
  • the terminal randomly selects the resource in the entire resource selection window, it is possible that the selected initial transmission resource is a candidate resource located at a later position in the time domain, resulting in a long service transmission delay. .
  • the embodiment of the application provides a method, device, terminal, and medium for resource selection in an Internet of Vehicles system, which can be used to solve the problem that since the sending terminal randomly selects resources in the entire resource selection window, the initial transmission resources that may be selected are The candidate resources at the back of the time domain cause the problem of large delay in service transmission.
  • the technical solution is as follows.
  • a method for resource selection in an Internet of Vehicles system including:
  • the resource selection window is a window from time n+T 11 to time n+T 12 , and the first time period from time n to time n+T 11 is greater than or equal to the processing delay of the terminal, The second time period from the time n to the time n+T 12 is less than or equal to the required delay range of the service, and the value of p is less than the preset value W.
  • a method for resource selection in an Internet of Vehicles system including:
  • the resource selection window is a window from time n+T 11 to time n+T 12 , the first time period from time n to time T 11 is greater than or equal to the processing delay of the terminal, and The second time period from time n to time T 12 is less than or equal to the required range of the service delay.
  • a device for resource selection in an Internet of Vehicles system including a determining module
  • the determining module is configured to select the initial transmission resource of the service in the resource selection window when there is a service to be transmitted at time n, and the initial transmission resource is located between the time n and the time n+p;
  • the resource selection window is a window from time n+T 11 to time n+T 12 , and the first time period from time n to time n+T 11 is greater than or equal to the processing delay of the terminal, The second time period from the time n to the time n+T 12 is less than or equal to the required delay range of the service, and the value of p is less than the preset value W.
  • a device for resource selection in an Internet of Vehicles system including a determining module
  • the determining module is configured to select a retransmission resource of the service in a resource selection window when there is a service to be transmitted at time n, where the retransmission resource is located after the initial transmission resource of the service;
  • the resource selection window is a window from time n+T 11 to time n+T 12 , and the first time period from time n to time n+T 11 is greater than or equal to the processing delay of the terminal, The second time period from the time n to the time n+T 12 is less than or equal to the delay requirement range of the service.
  • a terminal comprising: a processor; a transceiver connected to the processor; a memory for storing executable instructions of the processor; wherein the processing The device is configured to load and execute the executable instructions to implement the method for resource selection in the Internet of Vehicles system as described in the foregoing aspect.
  • a computer-readable storage medium is provided, and executable instructions are stored in the readable storage medium, and the executable instructions are loaded and executed by the processor to implement the aforementioned aspects.
  • the terminal selects resources in the resource selection window, by selecting the initial transmission resources of the service between time n and time n+p, it avoids the initial transmission of resources through the resources that are located later in the time domain in the resource selection window, and reduces The delay of service transmission.
  • FIG. 1 is a schematic diagram of a transmission mode of a side link in a related technology of the present application
  • Figure 2 is a schematic diagram of resource selection in LTE-V2X in a related technology of the present application
  • FIG. 3 is a block diagram of the physical layer structure of NR-V2X in a related technology of the present application
  • Figure 4 is a schematic diagram of TB transmission in a related technology of the present application.
  • Fig. 5 is a schematic diagram of resource selection in a car networking system in a related technology of the present application.
  • Fig. 6 is a schematic diagram of resource selection in a car networking system in a related technology of the present application.
  • FIG. 7 is a schematic diagram of resource selection in the Internet of Vehicles system in a related technology of the present application.
  • FIG. 8 is a schematic diagram of resource selection in the Internet of Vehicles system in a related technology of the present application.
  • Fig. 9 is a block diagram of a communication system supporting sideline transmission provided by an exemplary embodiment of the present application.
  • FIG. 10 is a flowchart of a method for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • FIG. 11 is a flowchart of determining a first reselection resource in a first reselection window according to an exemplary embodiment of the present application
  • FIG. 12 is a schematic diagram of resource selection in the Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • FIG. 13 is a flowchart of a method for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application
  • FIG. 14 is a schematic diagram of resource selection in the Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • 15 is a flowchart of determining a second reselection resource of a retransmission resource in a second reselection window provided by an exemplary embodiment of the present application;
  • FIG. 16 is a schematic diagram of resource selection in the Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • FIG. 17 is a structural block diagram of a device for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • FIG. 18 is a structural block diagram of a device for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • FIG. 19 is a schematic structural diagram of a terminal provided by an exemplary embodiment of the present application.
  • V2X Vehicle to Everything
  • V2X communication includes vehicle to vehicle (V2V) communication, vehicle to roadside infrastructure (V2I) communication, and vehicle to pedestrian (Vehicle to People, V2P) communication.
  • V2X applications will improve driving safety, reduce congestion and vehicle energy consumption, and improve traffic efficiency.
  • Side Link (SL) transmission It is a device-to-device communication method with higher spectrum efficiency and lower transmission delay.
  • mode A and mode B two side link transmission modes are defined: mode A and mode B.
  • mode A the transmission resources of the terminal are allocated by the base station through the downlink, and the terminal transmits data on the side link according to the resources allocated by the base station; the base station can be the terminal Allocating resources for a single transmission can also allocate resources for semi-static transmission to the terminal.
  • mode B the terminal selects a resource from the resource pool for data transmission. Specifically, the terminal may select transmission resources from the resource pool by means of listening, or select transmission resources from the resource pool by means of random selection.
  • the terminal can select transmission resources from the resource pool by means of listening.
  • resource selection is required.
  • a new data packet arrives at time n, and resource selection needs to be performed, and the resource listening window is [n-1000, n].
  • the service delay requirement is 100ms, and the resource selection window is [n+4,n+100].
  • the process for the terminal to select resources in the resource selection window is as follows (for the specific resource selection process, please refer to the operation steps in 3GPP TS36.213. Here are a few main resource selection steps):
  • the terminal regards all available resources in the resource selection window as a set A, and the terminal performs an operation to exclude resources in the set A.
  • Step 1 If the terminal sends data in some subframes in the resource listening window without listening, then the resources of these subframes on the corresponding subframes in the resource selection window are excluded.
  • Step 2 If the terminal detects the physical sidelink control channel (PSCCH) in the resource listening window, measure the reference signal received power of the physical sidelink shared channel (PSSCH) scheduled by the PSCCH (Reference Signal Received Power, RSRP), if the measured PSSCH-RSRP is higher than the PSSCH-RSRP threshold, and according to the reservation information in the control information transmitted in the PSCCH, it is determined that the reserved transmission resources are within the resource selection window of the terminal , The terminal excludes the resource from set A. Among them, the selection of the PSSCH-RSRP threshold is determined by the priority information carried in the detected PSCCH and the priority of the data to be transmitted by the terminal.
  • PSSCH-RSRP Reference Signal Received Power
  • Step 3 If the number of remaining resources in set A is less than 20% of the total number of resources, the terminal raises the PSSCH-RSRP threshold by 3dB, and repeats steps 1 to 2 until the number of remaining resources in set A is greater than the total number of resources 20% of it.
  • Step 4 The terminal performs sidelink Received Signal Strength Indicator (S-RSSI) detection on the remaining resources in set A, and sorts the remaining resources in set A according to the energy level, and sorts the resources with the lowest energy 20% (relative to the number of resources in set A) resources are put into set B.
  • S-RSSI Sidelink Received Signal Strength Indicator
  • Step 5 The terminal selects a resource from set B with a moderate probability for data transmission.
  • PSCCH301 used to transmit control information is included in PSSCH302 used to transmit data, which also means that PSCCH301 and PSSCH302 must be sent at the same time.
  • Transport Block In the current standard, only the initial transmission of the current data block (Transport Block, TB) is reserved for the retransmission of the current TB, the retransmission of the current TB is reserved for the retransmission of the current TB, and the initial transmission or retransmission of the previous TB is reserved. The initial transmission or retransmission of the current TB.
  • Transport Block TB
  • the current TB is TB2, and the previous TB is TB1.
  • the initial transmission 421 of TB2 is reserved for retransmission 422 and retransmission 423 of TB2
  • the retransmission 422 of TB2 is reserved for retransmission 423 of TB2
  • the initial transmission 411 of TB1 is reserved for the initial transmission 421 of TB2
  • the retransmission 412 of TB1 is reserved.
  • TB1 retransmission 413 reserves TB2 retransmission 423.
  • the terminal In NR-V2X, in the above-mentioned mode B, the terminal also needs to select resources by itself.
  • the resource selection mechanism is similar to the resource selection mechanism in LTE-V2X described above.
  • the terminal generates a service data packet at time n and needs to perform resource selection, and all resources in the resource selection window are taken as set A.
  • the resource selection window starts from n+T1 and ends at n+T2.
  • T1> the time for the terminal to prepare to send data and to select resources
  • the value of T2min ⁇ 1,5,10,20 ⁇ * 2 ⁇ slots (slot), where ⁇ 0,1,2,3 corresponds to the case where the subcarrier spacing is the 15,30,60,120kHz.
  • the terminal performs resource monitoring from n-T0 to n, and the value range of T0 is [100, 1100] milliseconds. If the terminal hears the PSCCH, it measures the RSRP of the PSCCH or the RSRP of the PSSCH scheduled by the PSCCH. If the measured RSRP is greater than the RSRP threshold, it determines its reserved resources according to the resource reservation information in the control information transmitted in the PSCCH In the resource selection window, the corresponding resource is excluded from the set A.
  • the terminal randomly selects a number of resources from the set A as sending resources for its initial transmission and retransmission.
  • the above RSRP threshold is determined by the priority carried in the PSCCH monitored by the terminal and the priority of the data to be sent by the terminal.
  • the difference between the time domain position of the initial transmission resource selected by the terminal and the time domain position of the last retransmission resource needs to be less than or equal to W.
  • W is equal to 32 time slots.
  • the length of each time slot is related to the sub-carrier spacing. If the sub-carrier spacing is 15 kHz, the time slot length is 1 millisecond, and if the sub-carrier spacing is 30 kHz, the time slot length is 0.5 milliseconds.
  • resource preemption is supported in NR-V2X, that is, after the terminal eliminates resources, set A may include resource blocks reserved by low-priority terminals, and the terminal performs processing on the resource blocks reserved by low-priority terminals. seize.
  • resource preemption can be achieved by adjusting the RSRP threshold.
  • terminal 1 generates data for resource selection at time n, and terminal 1 determines resource selection windows from n+T1 to n+T2 and resource listening windows from n-T0 to n.
  • terminal 1 listens, terminal 2 sends PSCCH and PSSCH at time n-a and reserves resource x at time n+b.
  • terminal 1 listens to the PSCCH sent by terminal 2, it knows that the priority carried in the PSCCH of terminal 2 is lower than the priority of the data to be sent, thereby raising the RSRP threshold, so that the measured RSRP of the signal sent by terminal 2 The probability of being lower than the RSRP threshold increases.
  • the terminal 1 When the measured RSRP is lower than the RSRP threshold, the terminal 1 will not exclude the resource x reserved by the terminal 2. If the terminal 1 randomly selects the resource x reserved by the terminal 2 in the set A after the resource is excluded, the terminal 1 preempts the resource x. Conversely, if the terminal 1 detects that the priority carried in the PSCCH of the terminal 2 is higher than the priority of the data to be sent by itself, the RSRP threshold is lowered, so that the resources reserved by the terminal 2 are easier to be excluded, thereby avoiding conflicts with high-priority data. The terminal uses the same resource block.
  • NR-V2X supports continuous listening (re-evaluation) after the initial resource selection.
  • the terminal generates data at time n, determines the resource listening window and resource selection window of the resource for resource selection, and the terminal selects the initial transmission resource x at time n+a, as well as n+b and n+c Retransmission resources y and z at time. After n time, the terminal will continue to listen to the PSCCH. Before the time n+a, if the terminal discovers that resource x, resource y, or resource z is reserved by other terminals through continuous monitoring (that is, a resource conflict occurs), and the measured RSRP is higher than the RSRP threshold, the terminal will release the corresponding resource, and Reselect another piece of resource on the premise that the service delay requirement is met.
  • n+a because the terminal has sent PSCCH and PSSCH on resource x and reserved resources y and z, only the terminal discovers through continuous monitoring that a high-priority UE has preempted resource y or z, and RSRP Above the RSRP threshold, the terminal will release the resource y or z and reselect the resource.
  • Hybrid Automatic Repeat Quest Hybrid Automatic Repeat Quest, HARQ
  • the terminal selects multiple time-frequency resources at a time and sends the same data each time.
  • the terminal receiving the service will not give feedback for each transmission of the terminal, but will only merge the received data.
  • HARQ retransmission The terminal selects multiple time-frequency resources at one time and sends the same data each time. For each transmission, the terminal receiving the service will feed back ACK/NACK to the terminal according to whether the reception is successful. ACK represents successful reception, and NACK represents reception failure. In NR V2X, when the terminal receives an ACK, it will stop sending data and release unused time-frequency resources. The receiving end performs HARQ feedback to the transmitting end through the Physical Sidelink Feedback Channel (PSFCH).
  • PSFCH Physical Sidelink Feedback Channel
  • the HARQ feedback of the terminal 2 to the terminal 1 for this data transmission occurs in the time slot t+a.
  • a is greater than or equal to k
  • the time slot t+a contains PSFCH resources
  • k takes 2 or 3 time slots in NR-V2X.
  • the terminal sends the initial transmission to the terminal receiving the service in time slot 1
  • the terminal that needs to receive the service performs HARQ feedback on the initial transmission in time slot 4, and then the terminal retransmits in time slot 6.
  • the terminal receiving the service performs HARQ feedback in time slot 8 for the terminal's retransmission.
  • Fig. 9 shows a block diagram of a communication system supporting sideline transmission provided by an exemplary embodiment of the present application.
  • the communication system may be a schematic diagram of a non-roaming 5G system architecture (Non-roaming 5G system architecture), and the system architecture may be applied to a vehicle to everything (V2X) service using D2D technology.
  • Non-roaming 5G system architecture Non-roaming 5G system architecture
  • V2X vehicle to everything
  • the system architecture includes a data network (Data Network, DN), and the data network is provided with a V2X application server (Application Server) required for a V2X service.
  • the system architecture also includes the 5G core network.
  • the network functions of the 5G core network include: Unified Data Management (UDM), Policy Control Function (PCF), Network Exposure Function (NEF), Application Function (AF), Unified Data Repository (UDR), Access and Mobility Management Function (AMF), Session Management Function (SMF), and user interface Function (User Plane Function, UPF).
  • the system architecture also includes: a radio access network (New Generation-Radio Access Network, NG-RAN) and four user equipments (ie, user equipment 1 to user equipment 4) shown by way of example, where each user equipment is V2X application (Application) is installed.
  • NG-RAN New Generation-Radio Access Network
  • user equipment 1 to user equipment 4 shown by way of example, where each user equipment is V2X application (Application) is installed.
  • the user equipment performs uplink transmission to the access network equipment.
  • the data network and the user plane function in the 5G core network are connected through the N6 reference point (Reference Point), the V2X application server is connected with the V2X application in the user equipment through the V1 reference point; the wireless access network is connected with the 5G core network
  • the AMF function and the UPF function in the connection the wireless access network is connected to the user equipment 1 and the user equipment 5 through the Uu reference point; the sideline transmission between multiple user equipments is carried out through the PC5 reference point, and the multiple V2X applications pass through V5 reference point connection.
  • the above-mentioned reference point may also be referred to as an "interface".
  • Fig. 10 shows a flowchart of a method for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • the method may be executed by a user equipment in V2X as shown in FIG. 9, and the user equipment is used as a terminal for sending services when executed, and the method includes:
  • Step 1001 When there is a service to be transmitted at time n, the initial transmission resource of the service is selected in the resource selection window, and the initial transmission resource is located between time n and time n+p.
  • the resource selection window is a window from time n+T 11 to time n+T 12 , the first time period from time n to time n+T 11 is greater than or equal to the processing delay of the terminal, and time n to time n+T 12
  • the second time period of is less than or equal to the service delay requirement range, and the value of p is less than the preset value W.
  • the terminal will perform resource selection only when the resource selection conditions are met.
  • two terminals communicate with each other in a way of side link.
  • the two terminals adopt the side link mode B, that is, the terminal selects a resource from the resource pool for data transmission by itself.
  • the terminal has a service to be transmitted.
  • the terminal can select a resource in the resource selection window from time n+T 11 to time n+T 12 , and select an initial transmission resource.
  • the initial transmission resource is located at time n and A time-frequency resource between time n+p.
  • the terminal uses the initial transmission resource to transmit the service to another terminal for the first time.
  • the terminal when the terminal has a service to be transmitted at time n and there is no initial transmission resource that meets the resource selection condition, the terminal will increase the RSRP threshold (such as 3db) until there is a resource that meets the resource selection condition to ensure that the service is available.
  • the service is transmitted to the receiving terminal within the extended range.
  • the preset value W is not less than the difference between the time domain position of the initial transmission resource selected by the terminal and the time domain position of the last retransmission resource.
  • the foregoing preset value W is equal to 32 time slots.
  • the length of each time slot is related to the sub-carrier spacing, as shown in Table 1:
  • Table 1 Mapping relationship between slot length and subcarrier spacing
  • the time slot length is 1 millisecond, and the preset value W is 32 milliseconds; if the subcarrier interval is 30kHz, the time slot length is 0.5 milliseconds, and the preset value W is 16 millisecond.
  • selecting the initial transmission resources of the service in the resource selection window includes: determining the resource listening window and the resource selection window; according to the listening result of the resource listening window, excluding the resources in the resource selection window, and obtaining Candidate resources in the resource selection window; the initial transmission resources of the service are selected from the candidate resources.
  • the resource listening window is a window from time nT 0 to time n.
  • the value of T0 is [100,1100] milliseconds.
  • the initial transmission resource of the service selected from the candidate resources may be: among the candidate resources, the initial transmission resource of the service is determined with equal probability.
  • the time-frequency positions of the candidate resources may partially overlap.
  • the terminal after excluding the resources in the resource selection window, the terminal obtains 4 candidate resources in the resource selection window: resource 1, resource 2, resource 3, and resource 4.
  • the terminal will select the initial transmission resource of the service with equal probability among these 4 resources.
  • the probability of resource 1, resource 2, resource 3, and resource 4 being selected as the initial transmission resource is 0.25.
  • the terminal takes all available resources in the resource selection window as a set A, and excludes the resources in the resource selection window according to the listening result of the resource listening window, that is, excludes the resources in the set A, including At least one of the following steps:
  • Step 1 If the terminal does not listen to some time slot data in the resource listening window, the resources on the corresponding time slots of these time slots in the resource selection window are excluded.
  • Step 2 If the terminal detects the PSCCH in the resource listening window, measure the RSRP of the PSSCH scheduled by the PSCCH or the RSRP of the PSCCH, if the measured PSSCH-RSRP is higher than the RSRP threshold, and according to the control information transmitted in the PSCCH If the reservation information determines that the reserved transmission resource is within the resource selection window of the terminal, the terminal excludes the resource from the set A.
  • the selection of the RSRP threshold is determined by the priority information carried in the detected PSCCH and the priority of the service data to be transmitted by the terminal.
  • Step 3 If the number of remaining resources in set A is less than 20% of the total number of resources, the terminal raises the RSRP threshold by 3dB, and repeats steps 1 to 2 until the number of remaining resources in set A is greater than 20% of the total number of resources .
  • the resources in the set A after the above steps are the resources remaining after excluding the resources in the resource selection window, that is, the candidate resources.
  • resource preemption is supported for the resources reserved by the low-priority terminal.
  • the terminal continuously listens to the initial transmission resource; when the initial transmission resource conflicts, the first reselection resource of the initial transmission resource is determined in the first reselection window.
  • the first reselection window is the window from time n+t 1 +T 21 to time n+t 1 +T 22
  • the first reselection resource is the distance between the candidate resources in the first reselection window and the initial transmission resource
  • time n+t 1 is the time when it is determined that the initial transmission resource conflicts
  • the candidate resource is the listening according to the resource listening window in the first reselection window A collection of resources that have not been excluded after the result is excluded.
  • the terminal when there is more than one time-frequency resource whose distance from the initial transmission resource is less than or equal to the distance i among the candidate resources in the first reselection window, the terminal equally selects one time-frequency resource as the first resource. Reselect resources.
  • the initial transmission resource is located at time n+b between time n and time n+p, and the terminal continues to listen to the initial transmission resource means that the terminal is in the time period from time n to time n+b, for each time
  • the resources in the slot are monitored to determine whether there are other terminals that also reserve the initial transmission resources.
  • the first time period from time n+t 1 to time n+t 1 to +T 21 is greater than or equal to the processing delay of the terminal, and the second time period from time n+t 1 to time n+t 1 +T 22 The time period is less than or equal to the service delay requirement range.
  • n+t 1 is 100 milliseconds, and the terminal determines that the initial transmission resource conflicts at n+100 milliseconds; the processing delay of the terminal is 10 milliseconds, from time n+t 1 to time n+t1+T 21 a period of time equal to the processing delay of the terminal, is also 10 ms; delay requirement of service range is 1000 ms, the time n + t 1 to time n + t 1 + T 22 second time period equal to the delay requirement of traffic The range, n+t 1+T 22 is 900 milliseconds.
  • the first reselection window is a window from time n+t 1 +10 to time n+t 1 +900.
  • the conflict of initial transmission resources means that during the continuous listening process, the initial transmission resources selected by the terminal are also reserved by other terminals as initial transmission resources or retransmission resources for transmitting other services.
  • the terminal UE1 when the initial transmission resources of the terminal UE1 conflict, the terminal UE1 measures the RSRP of other terminals UE2 that conflict, and when the measured RSRP of UE2 is higher than the RSRP threshold of UE1, the terminal UE1 will perform resource reconfiguration.
  • Election determine the first re-election resource.
  • the above RSRP threshold is determined by the priority carried in the PSCCH that the terminal UE1 listens to and the priority of the service data to be sent.
  • the initial transmission resources for the terminal to be released After determining the initial transmission resource conflict, the initial transmission resources for the terminal to be released, the time n + t 1 + T 21 to time n + t 1 + T 22 is determined as the first window re-select window, according to the first resource
  • the interception result of the interception window excludes the resources in the first reselection window to obtain candidate resources, and the elimination process is as described above.
  • the first resource listening window is a window from time n+t 1 -T 0 to time n+t 1 .
  • determining the first reselection resource among the candidate resources in the first reselection window may include the following steps:
  • Step 1101 Determine the first time slot interval s 1 -i to s 1 +i, where s 1 is the time slot corresponding to the initial transmission resource, the starting value of i is R 1 , and R 1 is an integer not less than 0;
  • Step 1102 When there is a candidate resource located in the first time slot interval in the first reselection window, determine the first reselection resource with an intermediate probability among the candidate resources located in the first time slot interval;
  • Step 1103 When there is no candidate resource in the first time slot interval in the first reselection window, after adding one to i, the step of determining the first time slot interval s 1 -i to s 1 +i is performed again.
  • the candidate resources include resource x, resource y, and resource z.
  • the time slot corresponding to the initial transmission resource a is time slot 5, the starting value of i is 1, the first time slot interval is time slot 4 to time slot 6, and there is no candidate resource in the first time slot interval.
  • the terminal determines the first time slot interval as time slot 3 to time slot 7.
  • the first reselection resource and the selected resource are located at different moments, and the selected resource is a resource selected by the terminal for other transmissions of the current TB.
  • the current TB is a transmission block corresponding to the service to be transmitted existing at time n.
  • the current TB may include multiple transmissions, including initial transmission and at least one retransmission.
  • the terminal will not use the resource m as the first reselection resource when reselecting the initial transmission resource.
  • the terminal when the terminal selects resources in the resource selection window, it avoids passing the time in the resource selection window by selecting the initial transmission resources of the service between time n and time n+p.
  • the candidate resource at the lower domain position initially transmits the service, reducing the delay of service transmission.
  • the terminal determines the time-frequency resource that is close to the original initial transmission resource in the time domain among the remaining resources after excluding the resources.
  • the terminal determines the time-frequency resource that is close to the original initial transmission resource in the time domain among the remaining resources after excluding the resources.
  • FIG. 13 shows a flowchart of a method for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application.
  • step 1002 is further included:
  • Step 1002 Select the retransmission resource of the service in the resource selection window, and the retransmission resource is located after the initial transmission resource.
  • the terminal excludes resources in the resource selection window according to the listening result of the resource listening window, obtains candidate resources in the resource selection window, and selects the service retransmission resource from the candidate resources. On the retransmission resource, the terminal transmits the service again to the terminal receiving the service.
  • the retransmission resource has two modes: HARQ feedback and blind retransmission.
  • Blind retransmission means that the terminal selects multiple time-frequency resources at a time, and sends the same data of one service each time.
  • the terminal receiving the service will not give feedback for each transmission of the terminal, but will only merge the received data.
  • HARQ feedback means that the terminal selects multiple time-frequency resources at one time and sends the same data each time. For each transmission, the receiving terminal will feed back ACK/NACK to the terminal according to whether the reception is successful, ACK represents successful reception, and NACK represents reception failure. When the terminal receives the ACK, it will stop sending data and release unused time-frequency resources. The receiving terminal performs HARQ feedback to the terminal through the PSFCH, that is, the side feedback channel.
  • Case 1 When the hybrid automatic repeat request HARQ feedback is active and the terminal receiving the service is allowed to perform 1-bit HARQ feedback on the same PSFCH resource for at least two transmissions of the terminal in the current TB, it is determined in the resource selection window Service retransmission resources.
  • Case 2 When the hybrid automatic repeat request HARQ feedback is active and the terminal receiving the service is allowed to perform 1-bit HARQ feedback on the same PSFCH resource for a transmission of the terminal in the current TB, determine the service status in the resource selection window Retransmit resources.
  • the terminal receiving the service feeds back multiple transmissions of the current TB, and there is no time interval requirement between two adjacent transmissions.
  • the terminal determines the retransmission resources of the service in the resource selection window, including: determining the retransmission resources of the service with equal probability among the candidate resources in the resource selection window.
  • the retransmission resource is located after the resource selected for the last transmission of the current TB, and the candidate resource is a resource set that is not excluded in the resource selection window.
  • the terminal excludes the corresponding time-frequency resources in the selection window n+T1 to n+T2 according to the interception result in the interception window at time n-T0 to n.
  • the remaining resources in the resource selection window are used as candidate resources, and all the candidate resources form a resource set A, including the resources ⁇ x, y, z, m, n, j, g, h ⁇ in FIG. 9.
  • k 2.
  • the terminal transmits once for the current TB and retransmits twice.
  • the terminal first selects the initial transmission resource between time n and time n+p, then the terminal randomly selects the initial transmission resource from the resource set ⁇ x,y ⁇ with a medium probability, assuming that the terminal selects the resource x as the initial transmission resource.
  • Case 1 when the terminal activates HARQ feedback or activates blind retransmission, and the remaining two retransmissions are randomly selected from the resource set ⁇ y, z, m, n, j, g, h ⁇ .
  • the receiving terminal feedbacks one transmission of the current TB.
  • At least one PSFCH resource must be included between two adjacent transmissions, so the retransmission resource is between the resource selected for the previous transmission of the current TB There are PSFCH resources.
  • the time at which the resource is retransmitted is greater than time n+a+Q, where n+a is the time when the terminal receiving the service performs HARQ feedback on the terminal’s last transmission in the current TB, and Q is the terminal receiving HARQ Feedback to the processing time required to send the next transmission.
  • the time slot n+a contains PSFCH resources, and through the PSFCH resources, the terminal receiving the service performs HARQ feedback on the terminal's last transmission in the current TB.
  • a is greater than or equal to k, and k takes 2 or 3 time slots in NR-V2X.
  • the terminal calculates according to the time slot where the selected initial transmission resource x is located and the resource pool configuration, and calculates that in the time slot n+ ⁇ , the receiving terminal performs HARQ feedback on the initial transmission of the terminal.
  • the terminal selects the resource for the first retransmission between time slot n+ ⁇ +Q (not including this time slot) and time n+T2, that is, the terminal selects the resource from the resource set ⁇ z,m,n,j,g,h ⁇ Randomly select the resource for the first retransmission, assuming that the terminal selects the resource z.
  • the terminal calculates, according to the time slot where the resource z is located and the resource pool configuration, that in the time slot n+ ⁇ , the receiving terminal performs HARQ feedback on the first retransmission of the terminal.
  • the terminal selects the resource for the second retransmission between time slot n+ ⁇ +Q (not including the time slot) and time n+T2, that is, the terminal selects the second retransmission resource from the resource set ⁇ j,g,h ⁇ Finally, the terminal selects resource h as the resource for the second retransmission.
  • the terminal abandons the second retransmission.
  • the terminal continuously listens to the retransmission resource; when the retransmission resource conflicts, determine the second reselection resource of the retransmission resource in the second reselection window;
  • the second reselection window is the window from time n+t 2 +T 31 to time n+t 2 +T 32
  • the second reselection resource is the distance between the candidate resources in the second reselection window and the retransmission resource
  • time n+t 2 is the time when it is determined that the retransmission resource conflicts
  • the candidate resource is the listening according to the resource listening window in the second reselection window A collection of resources that have not been excluded after the result is excluded.
  • the terminal when there are more than one time-frequency resources whose distance from the retransmission resource is less than or equal to the distance i among the candidate resources in the second reselection window, the terminal equally selects one time-frequency resource as the second time-frequency resource. Reselect resources.
  • the time n + t n + t 2 to time a first period 2 + T 31 is greater than or equal to the processing delay of the terminal, a second time period n + t 2 to time n + t 2 + T 32 of The segment is less than or equal to the service delay requirement range.
  • n+t 2 is 500 milliseconds
  • the terminal determines that the retransmission resource conflicts at n+500 milliseconds
  • the processing delay of the terminal is 10 milliseconds
  • the first time period is equal to the processing delay of the terminal, which is also 10 milliseconds
  • the required range of service delay is 1000 milliseconds
  • the second time period from time n to time n+t 2 +T 32 is equal to the required range of service delay.
  • T 32 is 500 milliseconds.
  • the second reselection window is a window from time n+t 2 +10 to time n+t 2 +500.
  • the conflict of retransmission resources means that in the process of continuous listening, the retransmission resources selected by the terminal are also reserved by other terminals as initial transmission resources or retransmission resources for transmitting other services.
  • the terminal UE1 when the retransmission resources of the terminal UE1 conflict, the terminal UE1 measures the RSRP of other terminals UE2 that conflict, and the measured RSRP of UE2 is higher than the RSRP threshold of UE1, and the priority of UE2 is higher than its own (The priority carried in the PSCCH of the UE2 is higher than the priority of the service data to be sent by the UE2), the terminal UE1 will perform resource reselection and determine the second reselection resource.
  • the above RSRP threshold is determined by the priority carried in the PSCCH that the terminal UE1 listens to and the priority of the service data to be sent.
  • the terminal of the retransmission resource to be released After determining the retransmission resource conflict occurs, the terminal of the retransmission resource to be released, the time n + t 2 + T 31 to time n + t 2 + T window 32 is determined to re-select a second window, according to a second resource
  • the interception result of the interception window excludes the resources in the second reselection window to obtain candidate resources, and the elimination process is as described above.
  • the second resource listening window is a window from time n+t 2 -T 0 to time n+t 2 .
  • determining the second reselection resource of the retransmission resource in the second reselection window may include the following steps:
  • Step 1501 Determine the second time slot interval s 2 -i to s 2 +i, where s 2 is the time slot corresponding to the retransmission resource, the starting value of i is R 2 , and R 2 is an integer not less than 0;
  • Step 1502 When there is a candidate resource located in the second time slot interval in the second reselection window, determine the second reselection resource with an intermediate probability among the candidate resources located in the second time slot interval;
  • Step 1503 When there is no candidate resource located in the second time slot interval in the second reselection window, after adding one to i, the step of determining the second time slot interval s 2 -i to s 2 +i is performed again.
  • the second reselection resource and the selected resource are located at different moments, and the selected resource is a resource selected by the terminal for other transmissions of the current TB.
  • the terminal will not use the resource m as the second reselection resource when reselecting the retransmission resource.
  • the terminal has a service to be transmitted at time n.
  • the terminal completes the resource selection, and selects the resources x, m, and j in Figure 16 as transmission resources (including initial transmission and retransmission).
  • the terminal discovers that resource m conflicts with resources reserved by other terminals through continuous monitoring, and the terminal needs to perform resource reselection for resource m.
  • the terminal excludes the corresponding time-frequency resources in the resource selection window n+t+T1 to n+t+T2 according to the listening result in the resource listening window from n+t-T0 to n+t.
  • the terminal excludes all resources in the time slots where resources x and j are located.
  • the terminal transmits once for the current TB and retransmits twice.
  • the terminal needs Q time slots from receiving HARQ feedback to the next transmission.
  • the resource m is in the time slot n+ ⁇ , and the terminal performs resource reselection for the resource m.
  • the terminal first sets i to 0, that is, the terminal searches for resources belonging to resource set A in the n+ ⁇ time slot. In the time slot n+ ⁇ , no resource belonging to resource set A is found, and the terminal adds 1 to i, that is, the terminal searches for resources belonging to resource set A in time slots n+ ⁇ -1 and n+ ⁇ +1.
  • the terminal finds resource g, and selects resource g as a reselection resource for resource m.
  • the terminal receiving the service can perform 1-bit HARQ feedback on one PSFCH resource for multiple transmissions of the current service of the terminal, it can also perform 1-bit HARQ feedback on one PSFCH resource for one transmission of the current service.
  • suitable resource selection schemes are designed for two situations respectively.
  • the terminal when performing resource reselection on conflicting retransmission resources based on continuous listening, the terminal determines the time-frequency resource that is close to the original retransmission resource in the time domain among the remaining resources after excluding the resources. In order to reselect resources, the situation that the time domain position of the reselected resources is backward in the resource selection window is avoided, and the timeliness of service transmission is again guaranteed.
  • FIG. 17 shows a structural block diagram of a device for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application, and the device includes: a determining module 1701;
  • the determining module 1701 is configured to select the initial transmission resource of the service in the resource selection window when there is a service to be transmitted at time n, and the initial transmission resource is located between time n and time n+p;
  • the resource selection window is a window from time n+T 11 to time n+T 12 , the first time period from time n to time n+T 11 is greater than or equal to the processing delay of the terminal, and time n to time n+T 12
  • the second time period of is less than or equal to the service delay requirement range, and the value of p is less than the preset value W.
  • the determining module 1701 is configured to determine the resource listening window and the resource selection window; the determining module 1701 is configured to exclude the resources in the resource selection window according to the listening result of the resource listening window to obtain Candidate resources in the resource selection window; the determining module 1701 is configured to select the initial transmission resources of the service from the candidate resources.
  • the device further includes a listening module 1702; the listening module 1702 is configured to continuously listen to the initial transmission resources; the determining module 1701 is configured to perform the first reselection window when the initial transmission resources conflict Determine the first reselection resource of the initial transmission resource; among them, the first reselection window is the window from time n+t 1 +T 21 to time n+t 1 +T 22 , and the first reselection resource is the first reselection window Among the candidate resources in, the time-frequency resource whose distance from the initial transmission resource is less than or equal to the distance i, i is an integer not less than 0, time n+t 1 is the time when the initial transmission resource conflict is determined, and the candidate resource is the first retransmission. Resource collections that are not excluded after being excluded in the selection window based on the listening results of the resource listening window.
  • the determining module 1701 is configured to determine the first time slot interval s 1 -i to s 1 +i, where s 1 is the time slot corresponding to the initial transmission resource, and the initial value of i is R 1 , R 1 Is an integer not less than 0; the determining module 1701 is configured to, when there is a candidate resource located in the first time slot interval in the first reselection window, determine the first reselection with an intermediate probability in the candidate resource located in the first time slot interval Selecting resources; the determining module 1701 is configured to increase i by one when there is no candidate resource in the first time slot interval in the first reselection window, and then execute again to determine the first time slot interval s 1 -i to s 1 +i steps.
  • the first reselection resource and the selected resource are located at different moments, and the selected resource is a resource selected by the terminal for other transmissions of the current TB.
  • the determining module 1701 is configured to select the retransmission resource of the service in the resource selection window, and the retransmission resource is located after the initial transmission resource.
  • the determining module 1701 is configured to perform 1-bit HARQ on the same PSFCH resource for at least two transmissions of the terminal to the terminal in the current TB when the hybrid automatic repeat request HARQ feedback is in an active state. During feedback, the retransmission resources of the service are determined in the resource selection window.
  • the determining module 1701 is configured to determine the retransmission resource of the service in the resource selection window when the blind retransmission is in the active state.
  • the determining module 1701 is configured to determine the retransmission resource of the service with equal probability among the candidate resources in the resource selection window; wherein, the retransmission resource is located after the resource selected in the last transmission of the current TB, and the candidate Resource is a collection of resources that are not excluded in the resource selection window.
  • the determining module 1701 is configured to perform HARQ feedback on a PSFCH resource for a single transmission of the terminal in the current TB when the HARQ feedback of the hybrid automatic repeat request is in an active state and is configured to perform HARQ feedback in the resource selection window. Determine the retransmission resources of the service in, where there are PSFCH resources between the retransmission resources and the resources selected for the last transmission of the current TB.
  • the time at which the resource is retransmitted is greater than time n+a+Q, where n+a is the time when the terminal receiving the service performs HARQ feedback on the terminal’s last transmission in the current TB, and Q is the terminal receiving HARQ Feedback to the processing time required to send the next transmission.
  • the listening module 1702 is configured to continuously listen for retransmission resources; the determining module 1701 is configured to determine the second retransmission resource in the second retransmission window when the retransmission resources conflict.
  • Resource selection wherein, the second reselection window is the window from time n+t 2 +T 31 to time n+t 2 +T 32 , and the second reselection resource is the candidate resource in the second reselection window and retransmission
  • the resource distance is less than or equal to the time-frequency resource of the distance i, i is an integer not less than 0, time n+t 2 is the time when it is determined that the retransmission resource conflicts, and the candidate resource is based on the resource listening window in the second reselection window
  • the collection of resources that have not been excluded after the interception result is excluded.
  • the determining module 1701 is configured to determine the second time slot interval s 2 -i to s 2 +i, where s 2 is the time slot corresponding to the retransmission resource, and the initial value of i is R 2 , R 2 Is an integer not less than 0; the determining module 1701 is configured to determine the first candidate resource in the second time slot interval with an intermediate probability when there is a candidate resource in the second time slot interval in the second reselection window Double selection of resources; the determining module 1701 is configured to increase i by one when there is no candidate resource in the second time slot interval in the second reselection window, and then execute again to determine the second time slot interval s 2- Steps from i to s 2 +i.
  • the second reselection resource and the selected resource are located at different moments, and the selected resource is a resource selected by the terminal for other transmissions of the current TB.
  • FIG. 18 shows a structural block diagram of a device for resource selection in an Internet of Vehicles system provided by an exemplary embodiment of the present application, and the device includes: a determining module 1801;
  • the determining module 1801 is configured to select the retransmission resource of the service in the resource selection window when there is a service to be transmitted at time n, and the retransmission resource is located after the initial transmission resource of the service;
  • the resource selection window is the window from time n+T 11 to time n+T 12 , the first time period from time n to time T 11 is greater than or equal to the processing delay of the terminal, and the first time period from time n to time n+T 12 2.
  • the time period is less than or equal to the service delay requirement range.
  • the determining module 1801 is configured to perform 1-bit HARQ on the same PSFCH resource for at least two transmissions of the current TB to the terminal when the hybrid automatic repeat request HARQ feedback is in an active state, and the terminal receiving the service is allowed to perform 1-bit HARQ on the same PSFCH resource.
  • the retransmission resources of the service are determined in the resource selection window.
  • the determining module 1801 is configured to determine the retransmission resource of the service in the resource selection window when the blind retransmission is in the active state.
  • the determining module 1801 is configured to determine the retransmission resource of the service with equal probability among the candidate resources in the resource selection window; wherein, the retransmission resource is located after the resource selected for the last transmission of the current TB, and the candidate A resource is a collection of resources that are not excluded in the resource selection window.
  • the determining module 1801 is configured to perform HARQ feedback on a PSFCH resource for a single transmission of the current TB when the hybrid automatic repeat request HARQ feedback is in an active state and the terminal receiving the service is allowed to perform HARQ feedback on a PSFCH resource.
  • the retransmission resource of the service is determined in the selection window; among them, there is a PSFCH resource between the retransmission resource and the resource selected for the last transmission of the current TB.
  • the time at which the resource is retransmitted is greater than time n+a+Q, where n+a is the time when the terminal receiving the service performs HARQ feedback on the terminal’s last transmission in the current TB, and Q is the terminal receiving HARQ Feedback to the processing time required to send the next transmission.
  • the device further includes a listening module 1802; the listening module 1802 is configured to continuously listen for retransmission resources; and the determining module 1801 is configured to perform the second reselection window when the retransmission resources conflict.
  • the second reselection resource in the determination of the retransmission resource; where the second reselection window is the window from time n+t 2 +T 31 to time n+t 2 +T 32 , and the second reselection resource is the second reselection window Among the candidate resources in the window, the time-frequency resource whose distance from the retransmission resource is less than or equal to the distance i, i is an integer not less than 0, time n+t 2 is the time when it is determined that the retransmission resource conflicts, and the candidate resource is the second The resource collections that have not been excluded after being excluded according to the listening results of the resource listening window in the reselection window.
  • the determining module 1801 is configured to determine the second time slot interval s 2 -i to s 2 +i, where s 2 is the time slot corresponding to the retransmission resource, and the initial value of i is R 2 , R 2 Is an integer not less than 0; the determining module 1801 is configured to determine the first candidate resource in the second time slot interval with an intermediate probability when there is a candidate resource in the second time slot interval in the second reselection window Double selection of resources; the determining module 1801 is configured to increase i by one when there is no candidate resource in the second time slot interval in the second reselection window, and then execute again to determine the second time slot interval s 2- Steps from i to s 2 +i.
  • the second reselection resource and the selected resource are located at different moments, and the selected resource is a resource selected by the terminal for other transmissions of the current TB.
  • FIG. 19 shows a schematic structural diagram of a sending terminal provided by an exemplary embodiment of the present application.
  • the communication device includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105.
  • the processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules.
  • the receiver 102 and the transmitter 103 may be implemented as a communication component, and the communication component may be a communication chip.
  • the memory 104 is connected to the processor 101 through a bus 105.
  • the memory 104 may be used to store at least one instruction, and the processor 101 is used to execute the at least one instruction to implement each step in the foregoing method embodiment.
  • the memory 104 can be implemented by any type of volatile or non-volatile storage device or a combination thereof.
  • the volatile or non-volatile storage device includes, but is not limited to: magnetic disks or optical disks, electrically erasable and programmable Read Only Memory (Erasable Programmable Read Only Memory, EEPROM), Erasable Programmable Read Only Memory (EPROM), Static Random Access Memory (SRAM), Read Only Memory (Read -Only Memory, ROM), magnetic memory, flash memory, Programmable Read-Only Memory (PROM).
  • a computer-readable storage medium stores at least one instruction, at least one program, code set, or instruction set, and the at least one instruction, the At least one program, the code set, or the instruction set is loaded and executed by the processor to implement the method for resource selection in the car networking system executed by the sending terminal provided by the foregoing method embodiments.
  • the program can be stored in a computer-readable storage medium.
  • the storage medium mentioned can be a read-only memory, a magnetic disk or an optical disk, etc.

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Abstract

本申请公开了一种车联网系统中资源选择的方法、装置、终端和介质，涉及无线通信领域，该方法包括：当时刻n存在待传输的业务时，在资源选择窗中选择业务的初传资源，初传资源位于时刻n和时刻n+p之间；其中，资源选择窗是时刻n+T 11至时刻n+T 12的窗口，时刻n至时刻T 11的第一时间段大于或等于发送终端的处理时延，时刻n至时刻T 12的第二时间段小于或等于业务的时延要求范围，p的取值小于预设值W。本申请中，终端在资源选择窗中进行资源选择时，通过在时刻n和时刻n+p之间选择业务的初传资源，避免了通过资源选择窗内的时域位置靠后的资源初传业务，减少了业务传输的时延。

Description

车联网系统中资源选择的方法、装置、终端和介质 技术领域
本申请涉及无线通信领域，特别涉及一种车联网系统中资源选择的方法、装置、终端和介质。
背景技术
为了实现车联网(Vehicle to everything，V2X)系统中的终端与终端之间的直接通信，引入了侧行链路(SideLink，SL)传输方式。
在SL的一种传输模式中，终端需要在资源池中进行资源选择。终端确定资源选择窗和资源侦听窗，根据资源侦听窗的侦听结果，对资源选择窗内的资源进行排除，得到待传输的业务的候选资源。终端在候选资源中随机的选择资源向接收业务的另一终端进行业务的传输，包括该业务的初传和重传。
通过上述方法选择业务的初传资源时，由于终端在整个资源选择窗中随机的进行资源选择，有可能选择的初传资源是时域位置靠后的候选资源，导致业务传输的时延较大。
发明内容
本申请实施例提供了一种车联网系统中资源选择的方法、装置、终端和介质，可以用于解决由于发送终端在整个资源选择窗中随机的进行资源选择，有可能选择的初传资源是时域位置靠后的候选资源，导致业务传输的时延较大的问题。所述技术方案如下。
根据本申请的一个方面，提供了一种车联网系统中资源选择的方法，所述方法包括：
当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的初传资源，所述初传资源位于所述时刻n和时刻n+p之间；
[根据细则91更正 13.03.2020]　
其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围，所述p的取值小于预设值W。
根据本申请的一个方面，提供了一种车联网系统中资源选择的方法，所述方法包括：
当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的重传资源，所述重传资源位于所述业务的初传资源之后；
其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻T 12的第二时间段小于或等于所述业务的时延要求范围。
根据本申请的一个方面，提供了一种车联网系统中资源选择的装置，所述装置包括确定模块；
所述确定模块，被配置为当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的初传资源，所述初传资源位于所述时刻n和时刻n+p之间；
[根据细则91更正 13.03.2020]　
其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围，所述p的取值小于预设值W。
根据本申请的一个方面，提供了一种车联网系统中资源选择的装置，所述装置包括确定模块；
所述确定模块，被配置为当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的重传资源， 所述重传资源位于所述业务的初传资源之后；
[根据细则91更正 13.03.2020]　
其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围。
根据本申请的一个方面，提供了一种终端，所述终端包括：处理器；与所述处理器相连的收发器；用于存储所述处理器的可执行指令的存储器；其中，所述处理器被配置为加载并执行所述可执行指令以实现如上述方面所述的车联网系统中资源选择的方法。
根据本申请的一个方面，提供了一种计算机可读存储介质，所述可读存储介质中存储有可执行指令，所述可执行指令由所述处理器加载并执行以实现如上述方面所述的车联网系统中资源选择的方法。
本申请实施例提供的技术方案至少包括如下有益效果：
终端在资源选择窗中进行资源选择时，通过在时刻n和时刻n+p之间选择业务的初传资源，避免了通过资源选择窗内的时域位置靠后的资源初传业务，减少了业务传输的时延。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一个相关技术中侧行链路的传输模式的示意图；
图2是本申请一个相关技术中在LTE-V2X中选取资源的示意图；
图3是本申请一个相关技术中的NR-V2X的物理层结构的框图；
图4是本申请一个相关技术中TB的传输的示意图；
图5是本申请一个相关技术中车联网系统中资源选择的示意图；
图6是本申请一个相关技术中车联网系统中资源选择的示意图；
图7是本申请一个相关技术中车联网系统中资源选择的示意图；
图8是本申请一个相关技术中车联网系统中资源选择的示意图；
图9是本申请一个示例性实施例提供的支持侧行传输的通信系统的框图；
图10是本申请一个示例性实施例提供的车联网系统中资源选择的方法的流程图；
图11是本申请一个示例性实施例提供的在第一重新选择窗中确定第一重选资源的流程图；
图12是本申请一个示例性实施例提供的车联网系统中资源选择的示意图；
图13是本申请一个示例性实施例提供的车联网系统中资源选择的方法的流程图；
图14是本申请一个示例性实施例提供的车联网系统中资源选择的示意图；
图15是本申请一个示例性实施例提供的在第二重新选择窗中确定重传资源的第二重选资源的流程图；
图16是本申请一个示例性实施例提供的车联网系统中资源选择的示意图；
图17是本申请一个示例性实施例提供的车联网系统中资源选择的装置的结构框图；
图18是本申请一个示例性实施例提供的车联网系统中资源选择的装置的结构框图；
图19是本申请一个示例性实施例提供的终端的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
首先，对本申请实施例中涉及的名词进行简单介绍：
车联网(Vehicle to everything，V2X)：是未来智能交通运输系统的关键技术，主要研究基于3GPP通信协议的车辆数据传输方案。V2X通信包括车与车(Vehicle to Vehicle，V2V)通信、车与路侧基础设施(Vehicle to Infrastructure，V2I)通信以及车与行人(Vehicle to People，V2P)通信。V2X应用将改善驾驶安全性、减少拥堵和车辆能耗、提高交通效率等。
侧行链路(SideLink，SL)传输：是一种设备到设备的通信方式，具有较高的频谱效率和较低的传输时延。在3GPP中定义了两种侧行链路的传输模式：模式A和模式B。如图1中的(a)所示，模式A中，终端的传输资源是由基站通过下行链路分配的，终端根据基站分配的资源在侧行链路上进行数据的发送；基站可以为终端分配单次传输的资源，也可以为终端分配半静态传输的资源。如图1中的(b)所示，模式B中，终端在资源池中自行选取一个资源进行数据的传输。具体的，终端可以通过侦听的方式在资源池中选取传输资源，或者通过随机选取的方式在资源池中选取传输资源。
在侧行链路的传输模式的模式B中，终端可以通过侦听的方式在资源池中选取传输资源。下面，对LTE-V2X和NR-V2X中的资源选取方法做出说明：
1)LTE-V2X中的资源选取方法
当在时刻n有新的数据包到达，需要进行资源选取，终端会根据过去1秒中的侦听结果，在[n+T1,n+T2]毫秒内进行资源选取，其中T1<＝4；20<＝T2<＝100,并且T1的选取应该大于终端的处理时延，T2的选取需要在业务的时延要求范围内。例如，如果业务的时延要求是50ms，则20<＝T2<＝50，业务的时延要求是100ms，则20<＝T2<＝100。
示例性的，如图2所示，在时刻n有新的数据包到达，需要进行资源选取，资源侦听窗为[n-1000,n]。业务的时延要求是100ms，资源选择窗为[n+4,n+100]。
终端在资源选择窗内进行资源选取的过程如下(具体的资源选取过程可以参照3GPP TS36.213中的操作步骤，此处列出了几个主要的资源选取步骤)：
终端将资源选择窗内所有可用的资源作为一个集合A，终端对集合A中的资源进行排除操作。
步骤一：如果终端在资源侦听窗内某些子帧(subframe)发送数据，没有进行侦听，则这些子帧在资源选择窗内对应的子帧上的资源被排除掉。
步骤二：如果终端在资源侦听窗内检测到物理侧行控制信道(Physical Sidelink Control Channel，PSCCH)，测量该PSCCH调度的物理侧行共享信道(Physical Sidelink Shared Channel，PSSCH)的参考信号接收功率(Reference Signal Received Power，RSRP)，如果测量的PSSCH-RSRP高于PSSCH-RSRP门限，并且根据该PSCCH中传输的控制信息中的预留信息确定其预留的传输资源在终端的资源选择窗内，则终端在集合A中排除掉该资源。其中，PSSCH-RSRP门限的选取是由检测到的PSCCH中携带的优先级信息和终端待传输数据的优先级确定的。
步骤三：如果集合A中剩余的资源个数小于总资源个数的20％，终端提升PSSCH-RSRP的门限3dB，并且重复步骤一至步骤二，直到集合A中剩余的资源个数大于总资源数的20％。
步骤四：终端对集合A中剩余的资源进行侧行接收信号场强指示(Sidelink Received Signal Strength Indicator，S-RSSI)检测，并且按照能量高低对集合A中剩余的资源进行排序，把能量最低的20％(相对于集合A中的资源个数)资源放入集合B。
步骤五：终端从集合B中等概率的选取一个资源进行数据传输。
2)NR-V2X中侦听的资源选取方法
在NR-V2X中，需要支持自动驾驶，因此对车辆之间数据交互提出了更高的要求，如更高的吞吐量、 更低的时延、更高的可靠性、更大的覆盖范围、更灵活的资源分配等。
NR-V2X的物理层结构如图3所示，用于传输控制信息的PSCCH301是包含在用于传输数据的PSSCH302中的，这也意味着PSCCH301与PSSCH302必须同时发送。
目前标准中只支持当前数据块(Transport Block，TB)的初传预留当前TB的重传，当前TB的重传预留当前TB的重传，以及上一个TB的初传或重传预留当前TB的初传或重传。
如图4所示，当前TB为TB2,上一个TB为TB1。TB2的初传421预留TB2的重传422和重传423,TB2的重传422预留TB2的重传423，TB1的初传411预留TB2的初传421，TB1的重传412预留TB2的重传422，TB1的重传413预留TB2的重传423。
NR-V2X中，在上述模式B下，终端也需要自行选择资源。其进行资源选择的机制与上述LTE-V2X中的资源选择机制类似。
终端在n时刻产生业务的数据包，需要进行资源选择，将资源选择窗内所有的资源作为集合A。资源选择窗从n+T1开始，到n+T2结束。T1>＝终端准备发送数据以及进行资源选择的时间,T2min<＝T2<＝业务的时延要求范围。T2min的取值为{1,5,10,20}*2 μ个时隙(slot)，其中μ＝0,1,2,3对应于子载波间隔是15，30，60，120kHz的情况。
如图5所示，终端在n-T0到n时刻进行资源侦听，T0的取值范围是[100,1100]毫秒。如果终端侦听到PSCCH，测量该PSCCH的RSRP或者该PSCCH调度的PSSCH的RSRP，如果测量的RSRP大于RSRP阈值，并且根据该PSCCH中传输的控制信息中的资源预留信息确定其预留的资源在资源选择窗内，则从集合A中排除对应资源。
进行资源排除后，终端从集合A中随机选择若干资源，作为其初传以及重传的发送资源。上述RSRP阈值是由终端侦听到的PSCCH中携带的优先级和终端待发送数据的优先级决定的。此外，终端选择的初传资源的时域位置与最后一次重传资源的时域位置相差需小于等于W。在NR-V2X中，W等于32个时隙。每个时隙的长度与子载波间隔有关，如果子载波间隔是15kHz则时隙长度是1毫秒，如果子载波间隔是30kHz则时隙长度是0.5毫秒。
需要注意的是，NR-V2X中支持资源抢占，即终端进行资源排除后，集合A中可能会包含低优先级终端所预留的资源块，终端对低优先级终端所预留的资源块进行抢占。例如，资源抢占可以通过调整RSRP阈值实现。
假设在图5中，终端1在时刻n产生数据进行资源选择，终端1确定了n+T1到n+T2的资源选择窗以及n-T0到n的资源侦听窗。在资源侦听窗内，终端1侦听到，终端2在n-a时刻发送PSCCH和PSSCH并预留n+b时刻的资源x。终端1在侦听到终端2发送的PSCCH后，得知终端2的PSCCH中携带的优先级比自身待发送数据的优先级低，从而提升了RSRP阈值，使得测量到的终端2发送信号的RSRP低于RSRP阈值的概率增加，当测量到的RSRP低于RSRP阈值时，终端1不会排除终端2所预留的资源x。如果终端1在资源排除过后的集合A中随机选到了终端2预留的资源x，则终端1抢占资源x。反之，如果终端1检测到终端2的PSCCH中携带的优先级比自身待发送数据的优先级高，则降低RSRP阈值，使得终端2预留的资源更容易被排除，从而避免与高优先级的终端使用同一资源块。
此外，NR-V2X支持在初始选择资源后继续进行持续侦听(re-evaluation)。
如图6所示，终端在n时刻产生数据，确定资源的资源侦听窗与资源选择窗进行资源选择，并且终端选择了n+a时刻的初传资源x，以及n+b和n+c时刻的重传资源y和z。在n时刻后，终端仍然会持续侦听PSCCH。在n+a时刻以前，如果终端通过持续侦听发现资源x或资源y或资源z被其他终端预留(即发生资源冲突)，并且测量的RSRP高于RSRP阈值，终端会释放对应资源，并在满足业务时延要求的前提下重选另一块资源。在n+a时刻后，因为终端已经在资源x上发送了PSCCH和PSSCH并预留了资源y和 z，只有终端通过持续侦听发现有高优先级的UE抢占了资源y或z，并且RSRP高于RSRP阈值，终端才会释放资源y或z，并重选资源。
在重传资源时，存在盲重传和混合自动重传请求(Hybrid Automatic Repeat Quest，HARQ)重传方式。
1)盲重传：终端一次选择多个时频资源，每次发送相同的数据，接收业务的终端不会针对终端的每次传输进行反馈，只会合并接收到的数据。
2)HARQ重传：终端一次选择多个时频资源，每次发送相同的数据。针对每次发送，接收业务的终端会根据是否接收成功，给终端反馈ACK/NACK，ACK代表接收成功，NACK代表接收失败。在NR V2X中，当终端收到ACK后，会停止发送数据，释放还没有使用的时频资源。接收端通过物理侧行反馈信道(Physical Sidelink Feedback Channel，PSFCH)对发送端进行HARQ反馈。
PSFCH资源是针对每个资源池配置的，在NR-V2X中，有N＝1、N＝2和N＝4三种配置。如图7所示，N＝1代表资源池中每个时隙都配置有PSFCH资源，N＝2代表每2个时隙配置有PSFCH资源，N＝4代表每4个时隙配置有PSFCH资源。
当终端1在时隙t发送数据给终端2，那么终端2针对此次数据发送对终端1进行的HARQ反馈发生在时隙t+a。其中，a大于等于k，并且时隙t+a中包含PSFCH资源，在NR-V2X中k取2或3个时隙。
结合参考图7，假设N＝4(即每4个时隙配置有PSFCH资源)并且k＝2，如果终端1在时隙1发送数据给终端2，则t+a为时隙4，终端2在时隙4对终端1进行HARQ反馈。如果终端1在时隙3发送数据给终端2，则t+a为时隙8，终端2在时隙8对终端1进行HARQ反馈。
在现有的NR V2X标准中，并未明确规定，在激活HARQ重传的情况下，是否支持接收终端针对发送终端当前TB的多次传输在同一PSFCH资源上进行1比特的HARQ反馈。
当支持接收业务的终端针对终端当前TB的多次传输在同一PSFCH资源上进行1比特的HARQ反馈(记为情况1)，如图8中的子图1所示，假设N＝4(即每4个时隙配置有PSFCH资源)，k＝2。当终端在时隙1发送初传到接收终端后，可以在时隙2进行重传，接收业务的终端在时隙4针对终端的初传和重传进行HARQ反馈。
当支持接收业务的终端针对终端当前TB的一次传输在一个PSFCH资源上进行1比特的HARQ反馈(记为情况2)，如图8中的子图2所示，假设N＝4，k＝2。当终端在时隙1发送初传到接收业务的终端后，需要接收业务的终端在时隙4对此次初传进行HARQ反馈后，终端再在时隙6进行重传。此后，接收业务的终端针对终端的重传在时隙8进行HARQ反馈。
从以上的分析可以得到，在情况1中，针对一个TB的多次传输，相邻的两次传输间没有时间间隔要求。在情况2中，针对一个TB的多次传输，相邻的两次传输间至少要包含一个PSFCH资源。因此，针对上述两种情况，需要分别进行资源选择算法的设计。
图9示出了本申请一个示意性实施例提供的支持侧行传输的通信系统的框图。该通信系统可以是非漫游5G系统构架(Non-roaming 5G system architecture)的示意图，该系统构架可以应用于使用D2D技术的车联网(Vehicle to everything，V2X)业务。
该系统架构包括数据网络(Data Network，DN)，该数据网络中设置有V2X业务所需的V2X应用服务器(Application Server)。该系统构架还包括5G核心网，5G核心网的网络功能包括：统一数据管理(Unified Data Management，UDM)、策略控制功能(Policy Control Function，PCF)、网络开放功能(Network Exposure Function，NEF)、应用功能(Application Function，AF)、统一数据存储(Unified Data Repository，UDR)、接入和移动性管理功能(Access and Mobility Management Function，AMF)、会话管理功能(Session Management Function，SMF)以及用户面功能(User Plane Function，UPF)。
该系统构架还包括：无线接入网(New Generation-Radio Access Network，NG-RAN)以及示例性示出的4个用户设备(即用户设备1至用户设备4)，其中，每个用户设备均设置有V2X应用(Application)。无线接入网中设置有一个或多个接入网设备，比如基站(gNB)。用户设备向接入网设备进行上行传输。
该系统构架中，数据网络与5G核心网中的用户面功能通过N6参考点(Reference Point)连接，V2X应用服务器与用户设备中的V2X应用通过V1参考点连接；无线接入网与5G核心网中的AMF功能以及UPF功能连接，无线接入网分别通过Uu参考点与用户设备1以及用户设备5连接；多个用户设备之间通过PC5参考点进行侧行传输，多个V2X应用之间通过V5参考点连接。上述参考点也可称为“接口”。
图10示出了本申请一个示例性实施例提供的车联网系统中资源选择的方法的流程图。该方法可以由如图9所示的V2X中的用户设备来执行，该用户设备在执行时是作为发送业务的终端，该方法包括：
步骤1001，当时刻n存在待传输的业务时，在资源选择窗中选择业务的初传资源，初传资源位于时刻n和时刻n+p之间。
[根据细则91更正 13.03.2020]　
其中，资源选择窗是时刻n+T 11至时刻n+T 12的窗口，时刻n至时刻n+T 11的第一时间段大于或等于终端的处理时延，时刻n至时刻n+T 12的第二时间段小于或等于业务的时延要求范围，p的取值小于预设值W。
可选的，在资源选择窗内存在多个用来传输业务的资源，终端在满足资源选择条件的情况下，才会进行资源选择。
在车联网系统中，两个终端之间采用侧行链路的方式进行通信。具体的，两个终端采用侧行链路的模式B，即终端在资源池中自行选取一个资源进行数据的传输。在时刻n，终端存在待传输的业务，终端可以在处于时刻n+T 11至时刻n+T 12的资源选择窗中进行资源选取，选择一个初传资源，该初传资源是位于时刻n和时刻n+p之间的一个时频资源。终端使用该初传资源，第一次向另一个终端传输该业务。
可选的，终端在时刻n存在待传输的业务，且没有满足资源选择条件的初传资源时，终端将抬升RSRP阈值(如3db)，直至有满足资源选择条件的资源，确保在业务的时延范围内传输该业务至接收终端。
可选的，预设值W不小于终端选择的初传资源的时域位置与最后一次重传资源的时域位置的差值。
可选的，上述预设值W等于32个时隙。每个时隙的长度与子载波间隔有关，见表1：
表1：时隙长度与子载波间隔的映射关系
子载波间隔(KHz) 时隙长度(ms)
15 1
30 0.5
60 0.25
120 0.125
240 0.0625
如表1所示，如果子载波间隔是15kHz，则时隙长度是1毫秒，预设值W为32毫秒；如果子载波间隔是30kHz，则时隙长度是0.5毫秒，预设值W为16毫秒。
在一个示例中，在资源选择窗中选择业务的初传资源，包括：确定资源侦听窗和资源选择窗；根据资源侦听窗的侦听结果，对资源选择窗中的资源进行排除，得到资源选择窗中的候选资源；在候选资源中选择出业务的初传资源。
可选的，资源侦听窗是时刻n-T 0至时刻n的窗口。T0取值为[100,1100]毫秒。
可选的，在候选资源中选择出业务的初传资源可以是:在候选资源中，等概率确定出业务的初传资源。
可选的，候选资源的时频位置可以是部分重叠的。
示例性的，终端在对资源选择窗中的资源进行排除后，得到资源选择窗中的4个候选资源：资源1、资源2、资源3和资源4。终端将在这4个资源中，等概率的选出业务的初传资源。资源1、资源2、资源3和资源4被选为初传资源的概率均为0.25。
可选的，终端将资源选择窗内所有可用的资源作为一个集合A，根据资源侦听窗的侦听结果，对资源选择窗中的资源进行排除，即对集合A中的资源进行排除，包括如下步骤中的至少一个步骤：
步骤一：如果终端在资源侦听窗内某些时隙数据，没有进行侦听，则这些时隙在资源选择窗内对应的时隙上的资源被排除掉。
步骤二：如果终端在资源侦听窗内检测到PSCCH，测量该PSCCH调度的PSSCH的RSRP或者该PSCCH的RSRP，如果测量的PSSCH-RSRP高于RSRP阈值，并且根据该PSCCH中传输的控制信息中的预留信息确定其预留的传输资源在终端的资源选择窗内，则终端在集合A中排除掉该资源。其中，RSRP阈值的选取是由检测到的PSCCH中携带的优先级信息和终端待传输的业务的数据的优先级确定的。
步骤三：如果集合A中剩余的资源个数小于总资源个数的20％，终端提升RSRP阈值3dB，并且重复步骤一至步骤二，直到集合A中剩余的资源个数大于总资源数的20％。
可选的，经过上述步骤后的集合A中的资源为对资源选择窗中的资源进行排除后剩余的资源，即候选资源。
可选的，在进行资源排除得到候选资源后，终端在候选资源中进行资源选择时，支持对低优先级的终端预留的资源进行资源抢占。
示例性的，资源抢占的过程如上文中图5对应的实施例所述。
在一个示例中，终端持续侦听初传资源；当初传资源发生冲突时，在第一重新选择窗中确定初传资源的第一重选资源。
其中，第一重新选择窗是时刻n+t 1+T 21至时刻n+t 1+T 22的窗口，第一重选资源是第一重新选择窗中的候选资源中与初传资源的距离小于或等于距离i的时频资源，i为不小于0的整数，时刻n+t 1是确定初传资源发生冲突的时刻，候选资源是第一重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
需要说明的是，当第一重新选择窗中的候选资源中与初传资源的距离小于或等于距离i的时频资源的数量不止一个时，终端等概率地从中选择一个时频资源作为第一重选资源。
可选的，初传资源位于时刻n和时刻n+p之间的时刻n+b，终端持续侦听初传资源是指终端在时刻n至时刻n+b的时间段内，对每个时隙中的资源进行侦听，确定是否存在其他终端也预留了该初传资源。
[根据细则91更正 13.03.2020]　
可选的，时刻n+t 1至时刻n+t 1至+T 21的第一时间段大于或等于终端的处理时延，时刻n+t 1至时刻n+t 1+T 22的第二时间段小于或等于业务的时延要求范围。
[根据细则91更正 13.03.2020]　
示例性的，n+t 1为100毫秒，终端在n+100毫秒时确定初传资源发生冲突；终端的处理时延为10毫秒，时刻n+t 1至时刻n+t1+T 21的第一时间段等于终端的处理时延，也为10毫秒；业务的时延要求范围为1000毫秒，时刻n+t 1至时刻n+t 1+T 22的第二时间段等于业务的时延要求范围，n+t 1+T 22为900毫秒。第一重新选择窗是时刻n+t 1+10至时刻n+t 1+900的窗口。
初传资源发生冲突是指在持续侦听的过程中，终端选定的初传资源被其他终端也预留为用来传输其他业务的初传资源或重传资源。
可选的，在终端UE1的初传资源发生冲突时，终端UE1对发生冲突的其他终端UE2的RSRP进行测量，在测量的UE2的RSRP高于UE1的RSRP阈值时，终端UE1才会进行资源重选，确定出第一重选资源。上述RSRP阈值是由终端UE1侦听到的PSCCH中携带的优先级和待发送业务的数据的优先级决定的。
在确定初传资源发生冲突后，终端对该初传资源进行释放，将时刻n+t 1+T 21至时刻n+t 1+T 22的窗口确 定为第一重新选择窗，根据第一资源侦听窗的侦听结果对第一重新选择窗内的资源进行排除，得到候选资源，排除过程如上文所述。其中，第一资源侦听窗是时刻n+t 1-T 0至时刻n+t 1的窗口。
结合参考图11，在第一重新选择窗中的候选资源中确定第一重选资源可以包括如下步骤：
步骤1101，确定第一时隙区间s 1-i至s 1+i，s 1为初传资源对应的时隙，i的起始值为R 1，R 1为不小于0的整数；
步骤1102，当第一重新选择窗中存在位于第一时隙区间的候选资源时，在位于第一时隙区间的候选资源中等概率地确定第一重选资源；
步骤1103，当第一重新选择窗中不存在位于第一时隙区间中的候选资源时，将i加一后，再次执行确定第一时隙区间s 1-i至s 1+i的步骤。
示例性的，结合参考图12，候选资源包括资源x、资源y和资源z。初传资源a对应的时隙为时隙5，i的起始值为1，第一时隙区间为时隙4至时隙6，在第一时隙区间内不存在候选资源。将i+1，终端将第一时隙区间确定为时隙3至时隙7。此时，在第一时隙区间内存在两个候选资源：资源x和资源y，终端将在两个候选资源中等概率的随机选择其中一个候选资源作为第一重选资源。
可选的，第一重选资源与已选资源位于不同的时刻，已选资源是终端为当前TB的其它传输所选的资源。
可选的，当前TB是与在时刻n存在的待传输的业务对应的传输块。当前TB可以包括多次传输，包括初传和至少一次重传。
如资源m是终端为当前TB的重传选择的重传资源，则在对初传资源进行重选时，终端不会将资源m作为第一重选资源。
综上所述，本实施例提供的方法，终端在资源选择窗中进行资源选择时，通过在时刻n和时刻n+p之间选择业务的初传资源，避免了通过资源选择窗内的时域位置靠后的候选资源初传业务，减少了业务传输的时延。
同时，本实施例提供的方法，根据持续侦听对冲突的初传资源进行资源重选时，终端通过将资源排除后的剩余资源中在时域上靠近原有初传资源的时频资源确定为重选资源，由于初传资源的位置在时刻n和时刻n+p之间，避免了重选资源在资源选择窗内的时域位置靠后的情况，再次保障了业务传输的及时性。
在基于图10的可选实施例中，图13示出了本申请一个示例性实施例提供的车联网系统中资源选择的方法的流程图。在本实施例中，还包括步骤1002：
步骤1002，在资源选择窗中选择业务的重传资源，重传资源位于初传资源之后。
可选的，终端根据资源侦听窗的侦听结果，对资源选择窗中的资源进行排除，得到资源选择窗中的候选资源，在候选资源中选择出业务的重传资源。在重传资源上，终端将该业务再次传输给接收业务的终端。
可选的，重传资源有HARQ反馈和盲重传两种方式。
盲重传是指终端一次选择多个时频资源，每次发送一个业务的相同的数据，接收业务的终端不会针对终端的每次传输进行反馈，只会合并接收到的数据。
HARQ反馈是指终端一次选择多个时频资源，每次发送相同的数据。针对每次发送，接收终端会根据是否接收成功，给终端反馈ACK/NACK，ACK代表接收成功，NACK代表接收失败。当终端收到ACK后，会停止发送数据，释放还没有使用的时频资源。接收终端通过PSFCH，即侧行反馈信道对终端进行HARQ反馈。
其中，在激活HARQ反馈，重传资源时，存在两种情况：
情况1：当混合自动重传请求HARQ反馈为激活状态，且允许接收业务的终端对终端在当前TB的至 少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在资源选择窗中确定业务的重传资源。
情况2：当混合自动重传请求HARQ反馈为激活状态，且允许接收业务的终端对终端在当前TB的一次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在资源选择窗中确定业务的重传资源。
上述激活HARQ反馈的情况1或者激活盲重传，都是接收业务的终端对当前TB的多次传输进行反馈，相邻的两次传输间没有时间间隔要求。
针对激活HARQ反馈的情况1或者激活盲重传，终端在资源选择窗中确定业务的重传资源，包括：在资源选择窗中的候选资源中，等概率确定出业务的重传资源。
其中，重传资源位于当前TB的上一次传输所选资源之后，候选资源是资源选择窗中未被排除的资源集合。
示例性的，结合参考图14。在n时刻有待传输的业务，终端依据n-T0到n时刻侦听窗内的侦听结果，排除选择窗n+T1到n+T2内对应的时频资源。资源选择窗内的剩余资源作为候选资源，所有的候选资源组成资源集合A，包括图9中的资源{x,y,z,m,n,j,g,h}。假设资源池配置，N＝4(即每4个时隙配置有PSFCH资源)，k＝2。终端针对当前TB初传一次，重传两次。
终端首先在时刻n到时刻n+p之间选择初传资源，则终端从资源集合{x,y}中等概率随机选择初传资源，假设终端选择了资源x作为初传资源。
终端激活HARQ反馈的情况1或者激活盲重传，剩余两次重传从资源集合{y,z,m,n,j,g,h}中随机选择。
针对激活HARQ反馈的情况2，接收终端对当前TB的1次传输进行反馈，相邻的两次传输间至少要包含一个PSFCH资源，所以重传资源与当前TB的上一次传输所选资源之间存在PSFCH资源。
在一个示例中，重传资源所在的时刻大于时刻n+a+Q，其中，n+a为接收业务的终端对终端在当前TB的上一次传输进行HARQ反馈的时刻，Q为终端收到HARQ反馈到发送下一次传输所需的处理时长。
可选的，时隙n+a中包含PSFCH资源，通过该PSFCH资源，接收业务的终端对终端在当前TB的上一次传输进行HARQ反馈。其中，a大于等于k，在NR-V2X中k取2或3个时隙。
示例性的，结合参考图14，终端根据已选的初传资源x所在的时隙以及资源池配置，计算出在时隙n+α，接收终端对终端的初传进行HARQ反馈。
终端在时隙n+α+Q(不包括该时隙)到时刻n+T2间选择第一次重传的资源，即终端从资源集合{z,m,n,j,g,h}中随机选择第一次重传的资源，假设终端选择了资源z。之后，终端根据资源z所在时隙以及资源池配置，计算出在时隙n+β，接收终端对终端的第一次重传进行HARQ反馈。则终端在时隙n+β+Q(不包括该时隙)到时刻n+T2间选择第二次重传的资源，即终端从资源集合{j,g,h}中选择第二次重传的资源，最终终端选择了资源h作为第二次重传的资源。当时隙n+β+Q(不包括该时隙)到n+T2时刻间不包含资源集合A中的资源时，终端放弃第二次重传。
在一个示例中，终端持续侦听重传资源；当重传资源发生冲突时，在第二重新选择窗中确定重传资源的第二重选资源；
其中，第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，第二重选资源是第二重新选择窗中的候选资源中与重传资源的距离小于或等于距离i的时频资源，i为不小于0的整数，时刻n+t 2是确定重传资源发生冲突的时刻，候选资源是第二重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
需要说明的是，当第二重新选择窗中的候选资源中与重传资源的距离小于或等于距离i的时频资源的数量不止一个时，终端等概率地从中选择一个时频资源作为第二重选资源。
[根据细则91更正 13.03.2020]　
可选的，时刻n+t 2至时刻n+t 2+T 31的第一时间段大于或等于终端的处理时延，时刻n+t 2至时刻n+t 2+T 32的第二时间段小于或等于业务的时延要求范围。
[根据细则91更正 13.03.2020]　
示例性的，n+t 2为500毫秒，终端在n+500毫秒时确定重传资源发生冲突；终端的处理时延为10毫秒，时刻n+t 2至时刻n+t 2+T 31的第一时间段等于终端的处理时延，也为10毫秒；业务的时延要求范围为1000毫秒，时刻n至时刻n+t 2+T 32的第二时间段等于业务的时延要求范围，T 32为500毫秒。第二重新选择窗是时刻n+t 2+10至时刻n+t 2+500的窗口。
重传资源发生冲突是指在持续侦听的过程中，终端选定的重传资源被其他终端也预留为用来传输其他业务的初传资源或重传资源。
可选的，在终端UE1的重传资源发生冲突时，终端UE1对发生冲突的其他终端UE2的RSRP进行测量，在测量的UE2的RSRP高于UE1的RSRP阈值，且UE2的优先级高于自己的优先级时(UE2的PSCCH中携带的优先级比自身待发送的业务的数据的优先级高)，终端UE1才会进行资源重选，确定出第二重选资源。上述RSRP阈值是由终端UE1侦听到的PSCCH中携带的优先级和待发送业务的数据的优先级决定的。
在确定重传资源发生冲突后，终端对该重传资源进行释放，将时刻n+t 2+T 31至时刻n+t 2+T 32的窗口确定为第二重新选择窗，根据第二资源侦听窗的侦听结果对第二重新选择窗内的资源进行排除，得到候选资源，排除过程如上文所述。其中，第二资源侦听窗是时刻n+t 2-T 0至时刻n+t 2的窗口。
结合参考图15，在第二重新选择窗中确定重传资源的第二重选资源，可以包括如下步骤：
步骤1501，确定第二时隙区间s 2-i至s 2+i，s 2为重传资源对应的时隙，i的起始值为R 2，R 2为不小于0的整数；
步骤1502，当第二重新选择窗中存在位于第二时隙区间中的候选资源时，在位于第二时隙区间中的候选资源中等概率地确定第二重选资源；
步骤1503，当第二重新选择窗中不存在位于第二时隙区间中的候选资源时，将i加一后，再次执行确定第二时隙区间s 2-i至s 2+i的步骤。
可选的，第二重选资源与已选资源位于不同的时刻，已选资源是终端为当前TB的其它传输所选的资源。
如资源m是终端为当前TB的另一次重传选择的重传资源，则在对重传资源进行重选时，终端不会将资源m作为第二重选资源。
示例性的，结合参考图16，终端在n时刻有待传输的业务。终端完成了资源选择，选择了图16中的资源x,m和j作为传输资源(包括初传和重传)。
在时刻n+t，终端通过持续侦听发现资源m与其他终端所预留的资源冲突，终端需要针对资源m进行资源重选。终端依据n+t-T0到n+t时刻资源侦听窗内的侦听结果，排除资源选择窗n+t+T1到n+t+T2内对应的时频资源。此外，终端将资源x与j所在时隙的全部资源排除。资源选择窗内剩余资源作为候选资源，所有的候选资源组成资源集合A，包括图16中的资源{y,z,g,n,h}。假设资源池配置，N＝4，k＝2。终端针对当前TB初传一次，重传两次。终端从收到HARQ反馈到下次传输需要Q个时隙。
资源m处于时隙n+α，终端针对资源m进行资源重选。
终端首先将i置为0，即终端在n+α时隙内寻找属于资源集合A的资源。在n+α时隙内并未找到属于资源集合A的资源，终端将i加1，即终端在时隙n+α-1与n+α+1中寻找属于资源集合A的资源。终端找到资源g，选择资源g作为针对资源m的重选资源。
综上所述，由于接收业务的终端可以针对终端当前业务的多次传输在一个PSFCH资源上进行1比特的HARQ反馈，也可以对当前业务的一次传输在一个PSFCH资源上进行1比特的HARQ反馈，本实施例提供的方法，分别针对两种情况设计了合适的资源选择方案。
同时，本实施例提供的方法，根据持续侦听对冲突的重传资源进行资源重选时，终端通过将资源排除后的剩余资源中在时域上靠近原有重传资源的时频资源确定为重选资源，避免了重选资源在资源选择窗内的时域位置靠后的情况，再次保障了业务传输的及时性。
图17示出了本申请一个示例性实施例提供的车联网系统中资源选择的装置的结构框图，该装置包括：确定模块1701；
确定模块1701，被配置为当时刻n存在待传输的业务时，在资源选择窗中选择业务的初传资源，初传资源位于时刻n和时刻n+p之间；
[根据细则91更正 03.03.2020]　
其中，资源选择窗是时刻n+T 11至时刻n+T 12的窗口，时刻n至时刻n+T 11的第一时间段大于或等于终端的处理时延，时刻n至时刻n+T 12的第二时间段小于或等于业务的时延要求范围，p的取值小于预设值W。
在一个示例中，确定模块1701，被配置为确定资源侦听窗和资源选择窗；确定模块1701，被配置为根据资源侦听窗的侦听结果，对资源选择窗中的资源进行排除，得到资源选择窗中的候选资源；确定模块1701，被配置为在候选资源中选择出业务的初传资源。
在一个示例中，该装置还包括侦听模块1702；侦听模块1702，被配置为持续侦听初传资源；确定模块1701，被配置为当初传资源发生冲突时，在第一重新选择窗中确定初传资源的第一重选资源；其中，第一重新选择窗是时刻n+t 1+T 21至时刻n+t 1+T 22的窗口，第一重选资源是第一重新选择窗中的候选资源中与初传资源的距离小于或等于距离i的时频资源，i为不小于0的整数，时刻n+t 1是确定初传资源发生冲突的时刻，候选资源是第一重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
在一个示例中，确定模块1701，被配置为确定第一时隙区间s 1-i至s 1+i，s 1为初传资源对应的时隙，i的起始值为R 1，R 1为不小于0的整数；确定模块1701，被配置为当第一重新选择窗中存在位于第一时隙区间的候选资源时，在位于第一时隙区间的候选资源中等概率地确定第一重选资源；确定模块1701，被配置为当第一重新选择窗中不存在位于第一时隙区间中的候选资源时，将i加一后，再次执行确定第一时隙区间s 1-i至s 1+i的步骤。
在一个示例中，第一重选资源与已选资源位于不同的时刻，已选资源是终端为当前TB的其它传输所选的资源。
在一个示例中，确定模块1701，被配置为在资源选择窗中选择业务的重传资源，重传资源位于初传资源之后。
在一个示例中，确定模块1701，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收业务的终端对终端在当前TB的至少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在资源选择窗中确定业务的重传资源。
在一个示例中，确定模块1701，被配置为当盲重传为激活状态时，在资源选择窗中确定业务的重传资源。
在一个示例中，确定模块1701，被配置为在资源选择窗中的候选资源中，等概率确定出业务的重传资源；其中，重传资源位于当前TB的上一次传输所选资源之后，候选资源是资源选择窗中未被排除的资源集合。
在一个示例中，确定模块1701，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收终端对终端在当前TB的一次传输在一个PSFCH资源上进行HARQ反馈时，在资源选择窗中确定业务的 重传资源；其中，重传资源与当前TB的上一次传输所选资源之间存在PSFCH资源。
在一个示例中，重传资源所在的时刻大于时刻n+a+Q，其中，n+a为接收业务的终端对终端在当前TB的上一次传输进行HARQ反馈的时刻，Q为终端收到HARQ反馈到发送下一次传输所需的处理时长。
在一个示例中，侦听模块1702，被配置为持续侦听重传资源；确定模块1701，被配置为当重传资源发生冲突时，在第二重新选择窗中确定重传资源的第二重选资源；其中，第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，第二重选资源是第二重新选择窗中的候选资源中与重传资源的距离小于或等于距离i的时频资源，i为不小于0的整数，时刻n+t 2是确定重传资源发生冲突的时刻，候选资源是第二重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
在一个示例中，确定模块1701，被配置为确定第二时隙区间s 2-i至s 2+i，s 2为重传资源对应的时隙，i的起始值为R 2，R 2为不小于0的整数；确定模块1701，被配置为当第二重新选择窗中存在位于第二时隙区间中的候选资源时，在位于第二时隙区间中的候选资源中等概率地确定第二重选资源；确定模块1701，被配置为当第二重新选择窗中不存在位于第二时隙区间中的候选资源时，将i加一后，再次执行确定第二时隙区间s 2-i至s 2+i的步骤。
在一个示例中，第二重选资源与已选资源位于不同的时刻，已选资源是终端为当前TB的其它传输所选的资源。
图18示出了本申请一个示例性实施例提供的车联网系统中资源选择的装置的结构框图，该装置包括：确定模块1801；
确定模块1801，被配置为当时刻n存在待传输的业务时，在资源选择窗中选择业务的重传资源，重传资源位于业务的初传资源之后；
[根据细则91更正 13.03.2020]　
其中，资源选择窗是时刻n+T 11至时刻n+T 12的窗口，时刻n至时刻T 11的第一时间段大于或等于终端的处理时延，时刻n至时刻n+T 12的第二时间段小于或等于业务的时延要求范围。
在一个示例中，确定模块1801，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收业务的终端对终端在当前TB的至少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在资源选择窗中确定业务的重传资源。
在一个示例中，确定模块1801，被配置为当盲重传为激活状态时，在资源选择窗中确定业务的重传资源。
在一个示例中，确定模块1801，被配置为在资源选择窗中的候选资源中，等概率确定出业务的重传资源；其中，重传资源位于当前TB的上一次传输所选资源之后，候选资源是资源选择窗中未被排除的资源集合。
在一个示例中，确定模块1801，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收业务的终端对终端在当前TB的一次传输在一个PSFCH资源上进行HARQ反馈时，在资源选择窗中确定业务的重传资源；其中，重传资源与当前TB的上一次传输所选资源之间存在PSFCH资源。
在一个示例中，重传资源所在的时刻大于时刻n+a+Q，其中，n+a为接收业务的终端对终端在当前TB的上一次传输进行HARQ反馈的时刻，Q为终端收到HARQ反馈到发送下一次传输所需的处理时长。
在一个示例中，该装置还包括侦听模块1802；侦听模块1802，被配置为持续侦听重传资源；确定模块1801，被配置为当重传资源发生冲突时，在第二重新选择窗中确定重传资源的第二重选资源；其中，第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，第二重选资源是第二重新选择窗中的候选资源中与重传资源的距离小于或等于距离i的时频资源，i为不小于0的整数，时刻n+t 2是确定重传资源发生冲突的时刻，候选资源是第二重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
在一个示例中，确定模块1801，被配置为确定第二时隙区间s 2-i至s 2+i，s 2为重传资源对应的时隙，i的起始值为R 2，R 2为不小于0的整数；确定模块1801，被配置为当第二重新选择窗中存在位于第二时隙区间中的候选资源时，在位于第二时隙区间中的候选资源中等概率地确定第二重选资源；确定模块1801，被配置为当第二重新选择窗中不存在位于第二时隙区间中的候选资源时，将i加一后，再次执行确定第二时隙区间s 2-i至s 2+i的步骤。
在一个示例中，第二重选资源与已选资源位于不同的时刻，已选资源是终端为当前TB的其它传输所选的资源。
图19示出了本申请一个示例性实施例提供的发送终端的结构示意图，该通信设备包括：处理器101、接收器102、发射器103、存储器104和总线105。
处理器101包括一个或者一个以上处理核心，处理器101通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器102和发射器103可以实现为一个通信组件，该通信组件可以是一块通信芯片。
存储器104通过总线105与处理器101相连。
存储器104可用于存储至少一个指令，处理器101用于执行该至少一个指令，以实现上述方法实施例中的各个步骤。
此外，存储器104可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，易失性或非易失性存储设备包括但不限于：磁盘或光盘，电可擦除可编程只读存储器(Erasable Programmable Read Only Memory,EEPROM)，可擦除可编程只读存储器(Erasable Programmable Read Only Memory,EPROM)，静态随时存取存储器(Static Random Access Memory，SRAM)，只读存储器(Read-Only Memory,ROM)，磁存储器，快闪存储器，可编程只读存储器(Programmable Read-Only Memory,PROM)。
在示例性实施例中，还提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有至少一条指令、至少一段程序、代码集或指令集，所述至少一条指令、所述至少一段程序、所述代码集或指令集由所述处理器加载并执行以实现上述各个方法实施例提供的由发送终端执行的车联网系统中资源选择的方法。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (48)

  1. [根据细则91更正 13.03.2020]
    一种车联网系统中资源选择的方法，其特征在于，应用于终端中，所述方法包括：
    当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的初传资源，所述初传资源位于所述时刻n和时刻n+p之间；
    其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围，所述p的取值小于预设值W。
  2. 根据权利要求1所述的方法，其特征在于，所述在资源选择窗中选择所述业务的初传资源，包括：
    确定资源侦听窗和所述资源选择窗；
    根据所述资源侦听窗的侦听结果，对所述资源选择窗中的资源进行排除，得到所述资源选择窗中的候选资源；
    在所述候选资源中选择出所述业务的所述初传资源。
  3. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    持续侦听所述初传资源；
    当所述初传资源发生冲突时，在第一重新选择窗中确定所述初传资源的第一重选资源；
    其中，所述第一重新选择窗是时刻n+t 1+T 21至时刻n+t 1+T 22的窗口，所述第一重选资源是所述第一重新选择窗中的候选资源中与所述初传资源的距离小于或等于距离i的时频资源，所述i为不小于0的整数，所述时刻n+t 1是确定所述初传资源发生冲突的时刻，所述候选资源是所述第一重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
  4. 根据权利要求3所述的方法，其特征在于，所述在第一重新选择窗中确定所述第一重选资源，包括：
    确定第一时隙区间s 1-i至s 1+i，所述s 1为所述初传资源对应的时隙，所述i的起始值为R 1，所述R 1为不小于0的整数；
    当所述第一重新选择窗中存在位于所述第一时隙区间的候选资源时，在位于所述第一时隙区间的候选资源中等概率地确定所述第一重选资源；
    当所述第一重新选择窗中不存在位于所述第一时隙区间中的候选资源时，将i加一后，再次执行所述确定第一时隙区间s 1-i至s 1+i的步骤。
  5. 根据权利要求4所述的方法，其特征在于，所述第一重选资源与已选资源位于不同的时刻，所述已选资源是所述终端为当前传输块TB的其它传输所选的资源。
  6. 根据权利要求1至5任一所述的方法，其特征在于，所述方法还包括：
    在所述资源选择窗中选择所述业务的重传资源，所述重传资源位于所述初传资源之后。
  7. 根据权利要求6所述的方法，其特征在于，所述在所述资源选择窗中选择所述业务的重传资源，包括：
    当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的至少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在所述资源选择窗中确定所述业务的所述重传资源。
  8. 根据权利要求6所述的方法，其特征在于，所述在所述资源选择窗中选择所述业务的重传资源，包括：
    当盲重传为激活状态时，在所述资源选择窗中确定所述业务的所述重传资源。
  9. 根据权利要求7或8所述的方法，其特征在于，所述在所述资源选择窗中确定所述业务的所述重传资源，包括：
    在所述资源选择窗中的候选资源中，等概率确定出所述业务的所述重传资源；
    其中，所述重传资源位于当前TB的上一次传输所选资源之后，所述候选资源是所述资源选择窗中未被排除的资源集合。
  10. 根据权利要求6所述的方法，其特征在于，所述在所述资源选择窗中选择所述业务的重传资源，包括：
    当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的一次传输在一个PSFCH资源上进行HARQ反馈时，在资源选择窗中确定所述业务的所述重传资源；
    其中，所述重传资源与当前TB的上一次传输所选资源之间存在所述PSFCH资源。
  11. 根据权利要求10所述的方法，其特征在于，所述重传资源所在的时刻大于时刻n+a+Q，
    其中，所述n+a为接收所述业务的终端对所述终端在所述当前TB的上一次传输进行HARQ反馈的时刻，所述Q为所述终端收到所述HARQ反馈到发送下一次传输所需的处理时长。
  12. 根据权利要求6至11任一所述的方法，其特征在于，所述方法还包括：
    持续侦听所述重传资源；
    当所述重传资源发生冲突时，在第二重新选择窗中确定所述重传资源的第二重选资源；
    其中，所述第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，所述第二重选资源是所述第二重新选择窗中的候选资源中与所述重传资源的距离小于或等于距离i的时频资源，所述i为不小于0的整数，所述时刻n+t 2是确定所述重传资源发生冲突的时刻，所述候选资源是所述第二重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
  13. 根据权利要求12所述的方法，其特征在于，所述在第二重新选择窗中确定所述重传资源的第二重选资源，包括：
    确定第二时隙区间s 2-i至s 2+i，所述s 2为所述重传资源对应的时隙，所述i的起始值为R 2，所述R 2为不小于0的整数；
    当所述第二重新选择窗中存在位于所述第二时隙区间中的候选资源时，在位于所述第二时隙区间中的所述候选资源中等概率地确定所述第二重选资源；
    当所述第二重新选择窗中不存在位于所述第二时隙区间中的候选资源时，将i加一后，再次执行确定第二时隙区间s 2-i至s 2+i的步骤。
  14. 根据权利要求13所述的方法，其特征在于，所述第二重选资源与已选资源位于不同的时刻，所述已选资源是所述终端为当前TB的其它传输所选的资源。
  15. [根据细则91更正 13.03.2020]
    一种车联网系统中资源选择的方法，其特征在于，所述方法包括：
    当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的重传资源，所述重传资源位于所述业务的初传资源之后；
    其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围。
  16. 根据权利要求15所述的方法，其特征在于，所述在所述资源选择窗中选择所述业务的重传资源，包括：
    当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的至少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在所述资源选择窗中确定所述业务的所述重传资源。
  17. 根据权利要求15所述的方法，其特征在于，所述在所述资源选择窗中选择所述业务的重传资源，包括：
    当盲重传为激活状态时，在所述资源选择窗中确定所述业务的所述重传资源。
  18. 根据权利要求16或17所述的方法，其特征在于，所述在所述资源选择窗中确定所述业务的所述重传资源，包括：
    在所述资源选择窗中的候选资源中，等概率确定出所述业务的所述重传资源；
    其中，所述重传资源位于当前TB的上一次传输所选资源之后，所述候选资源是所述资源选择窗中根据资源侦听窗内的侦听结果进行排除后未被排除的资源集合。
  19. 根据权利要求15所述的方法，其特征在于，所述在所述资源选择窗中选择所述业务的重传资源，包括：
    当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的一次传输在一个PSFCH资源上进行HARQ反馈时，在资源选择窗中确定所述业务的所述重传资源；
    其中，所述重传资源与当前TB的上一次传输所选资源之间存在所述PSFCH资源。
  20. 根据权利要求19所述的方法，其特征在于，所述重传资源所在的时刻大于时刻n+a+Q，
    其中，所述n+a为接收所述业务的终端对所述终端在所述当前TB的上一次传输进行HARQ反馈的时刻，所述Q为所述终端收到所述HARQ反馈到发送下一次传输所需的处理时长。
  21. 根据权利要求15至20任一所述的方法，其特征在于，所述方法还包括：
    持续侦听所述重传资源；
    当所述重传资源发生冲突时，在第二重新选择窗中确定所述重传资源的第二重选资源；
    其中，所述第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，所述第二重选资源是所述第二重新选择窗中的候选资源中与所述重传资源的距离小于或等于距离i的时频资源，所述i为不小于0的整数，所述时刻n+t 2是确定所述重传资源发生冲突的时刻，所述候选资源是所述第二重新选择窗中未被排除的资源集合。
  22. 根据权利要求21所述的方法，其特征在于，所述在第二重新选择窗中确定所述重传资源的第二重选资源，包括：
    确定第二时隙区间s 2-i至s 2+i，所述s 2为所述重传资源对应的时隙，所述i的起始值为R 2，所述R 2为不小于0的整数；
    当所述第二重新选择窗中存在位于所述第二时隙区间中的候选资源时，在位于所述第二时隙区间中的候选资源中等概率地确定所述第二重选资源；
    当所述第二重新选择窗中不存在位于所述第二时隙区间中的候选资源时，将i加一后，再次执行所述确定第二时隙区间s 2-i至s 2+i的步骤。
  23. 根据权利要求22所述的方法，其特征在于，所述第二重选资源与已选资源位于不同的时刻，所述已选资源是所述终端为当前TB的其它传输所选的资源。
  24. [根据细则91更正 13.03.2020]
    一种车联网系统中资源选择的装置，其特征在于，应用于终端中，所述装置包括：确定模块；
    所述确定模块，被配置为当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的初传资源，所述初传资源位于所述时刻n和时刻n+p之间；
    其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n至所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围，所述p的取值小于预设值W。
  25. 根据权利要求24所述的装置，其特征在于，
    所述确定模块，被配置为确定资源侦听窗和所述资源选择窗；
    所述确定模块，被配置为根据所述资源侦听窗的侦听结果，对所述资源选择窗中的资源进行排除，得到所述资源选择窗中的候选资源；
    所述确定模块，被配置为在所述候选资源中选择出所述业务的所述初传资源。
  26. 根据权利要求24所述的装置，其特征在于，所述装置还包括：侦听模块；
    所述侦听模块，被配置为持续侦听所述初传资源；
    所述确定模块，被配置为当所述初传资源发生冲突时，在第一重新选择窗中确定所述初传资源的第一重选资源；
    其中，所述第一重新选择窗是时刻n+t 1+T 21至时刻n+t 1+T 22的窗口，所述第一重选资源是所述第一重新选择窗中的候选资源中与所述初传资源的距离小于或等于距离i的时频资源，所述i为不小于0的整数，所述时刻n+t 1是确定所述初传资源发生冲突的时刻，所述候选资源是所述第一重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
  27. 根据权利要求26所述的装置，其特征在于，
    所述确定模块，被配置为确定第一时隙区间s 1-i至s 1+i，所述s 1为所述初传资源对应的时隙，所述i的起始值为R 1，所述R 1为不小于0的整数；
    所述确定模块，被配置为当所述第一重新选择窗中存在位于所述第一时隙区间的候选资源时，在位于所述第一时隙区间的候选资源中等概率地确定所述第一重选资源；
    所述确定模块，被配置为当所述第一重新选择窗中不存在位于所述第一时隙区间中的候选资源时，将i加一后，再次执行所述确定第一时隙区间s 1-i至s 1+i的步骤。
  28. 根据权利要求27所述的装置，其特征在于，所述第一重选资源与已选资源位于不同的时刻，所述已选资源是所述终端为当前传输块TB的其它传输所选的资源。
  29. 根据权利要求24至28任一所述的装置，其特征在于，
    所述确定模块，被配置为在所述资源选择窗中选择所述业务的重传资源，所述重传资源位于所述初传资源之后。
  30. 根据权利要求29所述的装置，其特征在于，
    所述确定模块，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的至少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在所述资源选择窗中确定所述业务的所述重传资源。
  31. 根据权利要求29所述的装置，其特征在于，
    所述确定模块，被配置为当盲重传为激活状态时，在所述资源选择窗中确定所述业务的所述重传资源。
  32. 根据权利要求30或31所述的装置，其特征在于，
    所述确定模块，被配置为在所述资源选择窗中的候选资源中，等概率确定出所述业务的所述重传资源；
    其中，所述重传资源位于当前TB的上一次传输所选资源之后，所述候选资源是所述资源选择窗中未被排除的资源集合。
  33. 根据权利要求29所述的装置，其特征在于，
    所述确定模块，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的一次传输在一个PSFCH资源上进行HARQ反馈时，在资源选择窗中确定所述业务的所述重传资源；
    其中，所述重传资源与当前TB的上一次传输所选资源之间存在所述PSFCH资源。
  34. 根据权利要求33所述的装置，其特征在于，所述重传资源所在的时刻大于时刻n+a+Q，
    其中，所述n+a为接收所述业务的终端对所述终端在所述当前TB的上一次传输进行HARQ反馈的时刻，所述Q为所述终端收到所述HARQ反馈到发送下一次传输所需的处理时长。
  35. 根据权利要求29至34任一所述的装置，其特征在于，所述装置还包括：侦听模块；
    所述侦听模块，被配置为持续侦听所述重传资源；
    所述确定模块，被配置为当所述重传资源发生冲突时，在第二重新选择窗中确定所述重传资源的第二重选资源；
    其中，所述第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，所述第二重选资源是所述第二重新选择窗中的候选资源中与所述重传资源的距离小于或等于距离i的时频资源，所述i为不小于0的整数，所述时刻n+t 2是确定所述重传资源发生冲突的时刻，所述候选资源是所述第二重新选择窗中根据资源侦听窗的侦听结果进行排除后未被排除的资源集合。
  36. 根据权利要求35所述的装置，其特征在于，
    所述确定模块，被配置为确定第二时隙区间s 2-i至s 2+i，所述s 2为所述重传资源对应的时隙，所述i的起始值为R 2，所述R 2为不小于0的整数；
    所述确定模块，被配置为当所述第二重新选择窗中存在位于所述第二时隙区间中的候选资源时，在位于所述第二时隙区间中的所述候选资源中等概率地确定所述第二重选资源；
    所述确定模块，被配置为当所述第二重新选择窗中不存在位于所述第二时隙区间中的候选资源时，将i加一后，再次执行确定第二时隙区间s 2-i至s 2+i的步骤。
  37. 根据权利要求36所述的装置，其特征在于，所述第二重选资源与已选资源位于不同的时刻，所述已选资源是所述终端为当前TB的其它传输所选的资源。
  38. [根据细则91更正 13.03.2020]
    一种车联网系统中资源选择的装置，其特征在于，所述装置包括：确定模块；
    所述确定模块，被配置为当时刻n存在待传输的业务时，在资源选择窗中选择所述业务的重传资源，所述重传资源位于所述业务的初传资源之后；
    其中，所述资源选择窗是时刻n+T 11至时刻n+T 12的窗口，所述时刻n所述时刻n+T 11的第一时间段大于或等于所述终端的处理时延，所述时刻n至所述时刻n+T 12的第二时间段小于或等于所述业务的时延要求范围。
  39. 根据权利要求38所述的装置，其特征在于，
    所述确定模块，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的至少两次传输在同一PSFCH资源上进行1比特的HARQ反馈时，在所述资源选择窗中确定所述业务的所述重传资源。
  40. 根据权利要求38所述的装置，其特征在于，
    所述确定模块，被配置为当盲重传为激活状态时，在所述资源选择窗中确定所述业务的所述重传资源。
  41. 根据权利要求39或40所述的装置，其特征在于，
    所述确定模块，被配置为在所述资源选择窗中的候选资源中，等概率确定出所述业务的所述重传资源；
    其中，所述重传资源位于当前TB的上一次传输所选资源之后，所述候选资源是所述资源选择窗中根 据资源侦听窗内的侦听结果进行排除后未被排除的资源集合。
  42. 根据权利要求38所述的装置，其特征在于，
    所述确定模块，被配置为当混合自动重传请求HARQ反馈为激活状态，且允许接收所述业务的终端对所述终端在当前TB的一次传输在一个PSFCH资源上进行HARQ反馈时，在资源选择窗中确定所述业务的所述重传资源；
    其中，所述重传资源与当前TB的上一次传输所选资源之间存在所述PSFCH资源。
  43. 根据权利要求42所述的装置，其特征在于，所述重传资源所在的时刻大于时刻n+a+Q，
    其中，所述n+a为接收所述业务的终端对所述终端在所述当前TB的上一次传输进行HARQ反馈的时刻，所述Q为所述终端收到所述HARQ反馈到发送下一次传输所需的处理时长。
  44. 根据权利要求38至43任一所述的装置，其特征在于，所述装置还包括：侦听模块；
    所述侦听模块，被配置为持续侦听所述重传资源；
    所述确定模块，被配置为当所述重传资源发生冲突时，在第二重新选择窗中确定所述重传资源的第二重选资源；
    其中，所述第二重新选择窗是时刻n+t 2+T 31至时刻n+t 2+T 32的窗口，所述第二重选资源是所述第二重新选择窗中的候选资源中与所述重传资源的距离小于或等于距离i的时频资源，所述i为不小于0的整数，所述时刻n+t 2是确定所述重传资源发生冲突的时刻，所述候选资源是所述第二重新选择窗中未被排除的资源集合。
  45. 根据权利要求44所述的装置，其特征在于，
    所述确定模块，被配置为确定第二时隙区间s 2-i至s 2+i，所述s 2为所述重传资源对应的时隙，所述i的起始值为R 2，所述R 2为不小于0的整数；
    所述确定模块，被配置为当所述第二重新选择窗中存在位于所述第二时隙区间中的候选资源时，在位于所述第二时隙区间中的候选资源中等概率地确定所述第二重选资源；
    所述确定模块，被配置为当所述第二重新选择窗中不存在位于所述第二时隙区间中的候选资源时，将i加一后，再次执行所述确定第二时隙区间s 2-i至s 2+i的步骤。
  46. 根据权利要求45所述的装置，其特征在于，所述第二重选资源与已选资源位于不同的时刻，所述已选资源是所述终端为当前TB的其它传输所选的资源。
  47. 一种终端，其特征在于，所述终端包括：
    处理器；
    与所述处理器相连的收发器；
    用于存储所述处理器的可执行指令的存储器；
    其中，所述处理器被配置为加载并执行所述可执行指令以实现如权利要求1至23中任一所述的车联网系统中资源选择的方法。
  48. 一种计算机可读存储介质，其特征在于，所述可读存储介质中存储有可执行指令，所述可执行指令由所述处理器加载并执行以实现如权利要求1至23中任一所述的车联网系统中资源选择的方法。
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