WO2020130715A1 - Procédé et appareil de prise en charge de multiples modes dans un système de communication sans fil - Google Patents

Procédé et appareil de prise en charge de multiples modes dans un système de communication sans fil Download PDF

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Publication number
WO2020130715A1
WO2020130715A1 PCT/KR2019/018221 KR2019018221W WO2020130715A1 WO 2020130715 A1 WO2020130715 A1 WO 2020130715A1 KR 2019018221 W KR2019018221 W KR 2019018221W WO 2020130715 A1 WO2020130715 A1 WO 2020130715A1
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Prior art keywords
mode
terminal
base station
communication
sidelink
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PCT/KR2019/018221
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English (en)
Korean (ko)
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양효선
권기범
박동현
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주식회사 아이티엘
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Publication of WO2020130715A1 publication Critical patent/WO2020130715A1/fr

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    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a method and apparatus for supporting a multi-mode in a terminal supporting vehicle communication (Vehicle to everything, V2X) in a wireless communication system. More specifically, it relates to a method and apparatus for a terminal supporting V2X to operate based on multiple modes.
  • V2X vehicle to everything
  • the International Telecommunication Union (ITU) is developing the International Mobile Telecommunication (IMT) framework and standards, and is currently in the process of discussing 5G communication through a program called "IMT for 2020 and beyond.” .
  • 3GPP 3rd Generation Partnership Project
  • NR New Radio
  • V2X communication may mean a communication method of exchanging or sharing information such as a traffic situation while communicating with a road infrastructure and other vehicles while driving.
  • V2X is a vehicle-to-vehicle (V2V), which means LTE/NR-based communication between vehicles, and a vehicle-to-pedestrian (V2P), which means LTE/NR-based communication between a vehicle and a terminal carried by an individual. It may include a vehicle-to-infrastructure/network (V2I/N), which means LTE/NR-based communication between roadside units/networks.
  • a roadside unit may be a transport infrastructure entity implemented by a base station or a fixed terminal.
  • LTE and NR systems which are radio access technologies (RAT) in 5G systems, are being discussed based on performance requirements for supporting V2X through 5G systems, such as autonomous driving and vehicle remote control. .
  • RAT radio access technologies
  • the present invention can provide a method and apparatus for supporting multiple modes by a terminal supporting vehicle communication in a wireless communication system.
  • the present invention can provide a method and apparatus for determining a mode in which a terminal supporting vehicle communication in a wireless communication system operates.
  • the present invention can provide a method and apparatus for preventing unnecessary mode switching by a terminal supporting vehicle communication when a V2X service is provided in a wireless communication system.
  • the present invention can provide a method and apparatus for a terminal supporting vehicle communication in a wireless communication system to continuously perform V2X sidelink communication.
  • the present invention can provide a method for a terminal supporting V2X communication in a wireless communication system to perform sidelink communication.
  • the method for performing sidelink communication includes receiving resource allocation mode indication information from the base station, detecting that a packet for the first service occurs, checking assigned carrier and resource pool configuration, and resource allocation mode
  • the method may include selecting a resource allocation mode for packet transmission for the first service based on the indication information and performing sidelink communication based on the selected resource allocation mode.
  • the present invention can provide a method and apparatus for supporting multiple modes by a terminal supporting vehicle communication in a wireless communication system.
  • a method and apparatus for preventing unnecessary mode switching by a terminal supporting vehicle communication may be provided.
  • FIG. 1 is a view showing a wireless communication system to which the present disclosure can be applied.
  • FIG. 2 is a view showing a V2X link to which the present disclosure can be applied.
  • FIG. 3 is a diagram for explaining a V2X scenario to which the present disclosure can be applied.
  • FIG. 4 is a diagram illustrating a scenario in which V2X operation is performed using both sidelink and communication with a base station to which the present disclosure can be applied.
  • 5 is a communication scenario to which the present disclosure can be applied.
  • FIG. 6 is a communication scenario to which the present disclosure can be applied.
  • FIG. 7 is a diagram showing an operation based on a base station scheduling mode and a terminal autonomous determination mode to which the present disclosure can be applied.
  • FIG. 8 may be a diagram showing an overall structure for V2X communication to which the present disclosure can be applied.
  • FIG. 9 is a diagram illustrating a method in which a mode is selected based on CBR.
  • FIG. 10 is a diagram showing a method of supporting multiple modes.
  • FIG. 11 is a view showing the configuration of a base station apparatus and a terminal apparatus according to the present disclosure.
  • first and second are used only for the purpose of distinguishing one component from other components, and do not limit the order, importance, or the like between components unless otherwise specified. Accordingly, within the scope of the present disclosure, the first component in one embodiment may be referred to as a second component in another embodiment, and likewise the second component in one embodiment may be the first component in another embodiment It can also be called.
  • components that are distinguished from each other are for clarity of each feature, and do not mean components are separated. That is, a plurality of components may be integrated to be composed of one hardware or software unit, or one component may be distributed to be composed of a plurality of hardware or software units. Accordingly, such integrated or distributed embodiments are included within the scope of the present disclosure, unless otherwise stated.
  • components described in various embodiments are not necessarily essential components, and some may be optional components. Accordingly, an embodiment consisting of a subset of components described in one embodiment is also included in the scope of the present disclosure. Also, embodiments including other elements in addition to the elements described in various embodiments are included in the scope of the present disclosure.
  • this specification is described for a wireless communication network, the work performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that is in charge of the wireless communication network, or the wireless The operation can be performed at the terminal coupled to the network.
  • a system for example, a base station
  • BS base station
  • eNB eNodeB
  • gNB gNodeB
  • AP access point
  • UE user equipment
  • MS mobile station
  • MSS mobile subscriber station
  • SS subscriber station
  • non-AP STA non-AP station
  • transmitting or receiving a channel includes transmitting or receiving information or a signal through the corresponding channel.
  • transmitting a control channel means transmitting control information or a signal through the control channel.
  • transmitting a data channel means transmitting data information or a signal through the data channel.
  • NR system is used for the purpose of distinguishing a system to which various examples of the present disclosure are applied from an existing system, but the scope of the present disclosure is not limited by these terms.
  • the NR system supports various subcarrier spacing (SCS) considering various scenarios, service requirements, and potential system compatibility.
  • SCS subcarrier spacing
  • NR systems are designed to overcome poor channel environments such as high path-loss, phase-noise, and frequency offset occurring on a high carrier frequency. It can support the transmission of the physical signal / channel through the beam of.
  • the NR system can support services such as enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC)/ultra Machine Type Communications (uMTC), and Ultra Reliable and Low Latency Communications (URLLC).
  • eMBB enhanced Mobile Broadband
  • mMTC Massive Machine Type Communications
  • uMTC ultra Machine Type Communications
  • URLLC Ultra Reliable and Low Latency Communications
  • 5G mobile communication technology may be defined.
  • 5G mobile communication technology may be defined to include not only the above-described NR system, but also an existing Long Term Evolution-Advanced (LTE-A) system. That is, 5G mobile communication may be a technology that operates in consideration of backward compatibility with a previous system as well as a newly defined NR system.
  • LTE-A Long Term Evolution-Advanced
  • the sidelink field of 5G may include both a sidelink in an LTE system and a sidelink in an NR system.
  • the side link field may be an essential field for improving performance through ultra-high reliability and ultra-low delay and grafting new and diverse services.
  • FIG. 1 is a view showing a wireless communication system to which the present invention is applied.
  • the NG-RAN or E-UMTS system may include a Long Term Evolution (LTE), an Advanced (LTE-A) system, or may include a fifth generation mobile communication network, a new radio (NR), and the like.
  • LTE Long Term Evolution
  • LTE-A Advanced
  • NR new radio
  • a base station (BS) and a user equipment (UE) 12 in a wireless communication system 10 may wirelessly transmit and receive data.
  • the wireless communication system 10 may support device-to-device (D2D) communication.
  • the wireless communication system 10 may support V2X communication. The following may include both the concept of a terminal device used by a general user, such as a smart phone, and a terminal device mounted in a vehicle for the above-described terminal.
  • the base station 11 may provide a communication service to a terminal existing in the coverage of the base station through a specific frequency band. Coverage serviced by a base station can also be expressed in terms of a site.
  • a site may include a number of areas 15a, 15b, 15c, which may be called sectors. Each sector included in the site may be identified based on different identifiers. Each sector 15a, 15b, 15c may be a partial area covered by the base station 11.
  • the base station 11 generally refers to a station communicating with the terminal 12, evolved-NodeB (eNodeB), gNodeB, ng-eNB, Base Transceiver System (BTS), access point (Access) Point, femto base station (Femto eNodeB), home base station (HeNodeB: Home eNodeB), relay (relay), remote radio head (RRH: Remote Radio Head), DU (Distributed Unit), etc.
  • eNodeB evolved-NodeB
  • gNodeB gNodeB
  • ng-eNB Base Transceiver System
  • Access Access
  • femto base station Femto eNodeB
  • HeNodeB Home eNodeB
  • relay relay
  • RRH Remote Radio Head
  • DU Distributed Unit
  • the terminal 12 may be fixed or mobile, and a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device (PDA), or a personal digital assistant (PDA) , Wireless modem, and handheld device.
  • MS mobile station
  • MT mobile terminal
  • UT user terminal
  • SS subscriber station
  • PDA wireless device
  • PDA personal digital assistant
  • the base station 11 may be referred to in various terms, such as megacell, macrocell, microcell, picocell, femtocell, depending on the size of coverage provided by the base station.
  • the cell may be used as a term indicating all or part of a frequency band provided by the base station, coverage of the base station, or base station.
  • a downlink means a communication or communication path from the base station 11 to the terminal 12, and an uplink (UL) communicates from the terminal 12 to the base station 11 or It means the communication path.
  • the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • OFDM-FDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • TDD time division duplex
  • FDD frequency division duplex
  • Table 1 may be a definition for each term in relation to the above-described V2X.
  • -V2P vehicle-to-pedestrian: Covers LTE or NR-based communication between vehicles and devices transported by individuals (e.g., mobile phone terminals carried by pedestrians, bicycles, drivers or passengers)
  • a roadside unit is a transportation infrastructure implemented by a base station or a fixed terminal. Entity (for example, an entity that sends rate notifications).
  • -GNSS Global Navigation Satellite System
  • FIG. 2 is a view showing a link considered in V2X.
  • a communication system supporting V2X can support only a PC5 link, which is a link between a UE and a UE defined in D2D (ProSe).
  • the PC5 link means an interface defined between the terminal and the terminal, and may be defined as a sidelink (SL) in the wireless access layer.
  • the side link means a link in a wireless access layer for direct communication between a vehicle for vehicle communication and a vehicle, but is not limited to the above.
  • FIG. 3 may be a V2X operation scenario using communication with a terminal (or vehicle) and a base station.
  • a communication system supporting V2X may only support a Uu link, which is a link between a base station and a terminal (UE) or between a radio access network and a terminal (UE).
  • the Uu link may include uplink (UL), which is a path through which a terminal transmits a signal to a base station, and downlink (DL), which is a path through which a base station transmits a signal to a terminal.
  • UL uplink
  • DL downlink
  • terms necessary for V2X may be defined as Table 1 and Table 2 described above.
  • D2D Device to Device
  • ProSe may mean a proximity service to a terminal performing D2D communication.
  • the sidelink (SL) may be the sidelink described above
  • the Sidelink Control Information (SCI) may refer to the control information related to the sidelink.
  • a PSSCH Physical Sidelink Shared Channel
  • a PSCCH Physical Sidelink Control Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSDCH Physical Sidelink Discovery Channel
  • V2V may mean communication between vehicles
  • V2P may indicate communication between vehicles and pedestrians
  • V2I/N may mean communication between vehicles and infrastructure/network. This will be described later.
  • the terminal described below may be a vehicle.
  • the terminal is referred to as a unit, but the terminal may be a vehicle for V2X.
  • the terminal may refer to a device capable of performing communication with a sidelink and a base station, and is not limited to the above-described embodiment. However, hereinafter, it is referred to as a terminal for convenience of description.
  • FIG. 4 may be a scenario in which V2X operation is performed using both the above-described sidelink and base station communication.
  • both the PC5 link and the Uu link described above may be considered, including a Road Side Unit (RSU) in the form of a UE.
  • RSU Road Side Unit
  • 4A is a case in which a base station transmits a downlink signal to a plurality of vehicles
  • FIG. 4B is a case in which a terminal (UE, RSU) transmits a sidelink signal to a plurality of vehicles.
  • D2D communication may mean communication that directly transmits and receives data between terminals.
  • the terminal or vehicle supports D2D communication.
  • D2D communication may be replaced by an expression such as Proximity based Service (ProSe) or ProSe-D2D communication.
  • ProSe Proximity based Service
  • ProSe-D2D communication Proximity based Service
  • the use of the term ProSe for D2D communication means that the meaning of transmitting and receiving data directly between terminals is not changed, but the meaning of the proximity-based service can be added.
  • D2D communication is a discovery procedure for communication between terminals in network coverage (in-coverage) or out-of-coverage, and direct communication (transmission/reception of control data and/or traffic data between terminals) direct communication).
  • a terminal transmitting a signal based on D2D communication may be a transmitting terminal (Tx UE).
  • a terminal receiving a signal based on D2D communication may be a receiving terminal (Rx UE).
  • the transmitting terminal may transmit a discovery signal
  • the receiving terminal may receive the discovery signal.
  • the roles of the transmitting terminal and the receiving terminal may be changed.
  • the signal transmitted by the transmitting terminal may be received by two or more receiving terminals.
  • the D2D communication described above can be used for various purposes.
  • D2D communication within a network coverage based on commercial frequency may be used for at least one or more of public safety, traffic network service, ultra-low latency service, and commercial purpose service.
  • D2D communication through the corresponding frequency may be used only for traffic network communication and traffic safety regardless of network coverage.
  • the load of the base station can be distributed.
  • the terminals close to each other perform D2D communication, since the terminals transmit data at a relatively short distance, consumption of transmission power and transmission latency of the terminal may be reduced.
  • the existing cellular-based communication and the D2D communication use the same resources from the overall system point of view, it is possible to improve the frequency utilization efficiency when they are not spatially overlapped.
  • D2D communication in the above, it can be equally applied to V2X communication. Although described above and below are described as V2X communication for convenience of description, D2D communication may be applied in the same way, and is not limited to the above-described embodiment.
  • V2X communication may be divided into network coverage (base station coverage) (In-coverage, IC) communication and network coverage out-of-coverage (OCC) communication.
  • IC network coverage
  • OCC network coverage out-of-coverage
  • the IC may be communication between terminals located in network coverage.
  • OCC may be communication between terminals located outside the network coverage.
  • V2X communication may be divided into communication between a terminal located within network coverage and a terminal located outside network coverage.
  • FIG. 5 may be a scenario for V2X communication.
  • the first terminals V2X UE1 and 510 and the second terminals V2X UE2 and 520 are located within the network coverage, communication with the base station may be possible. That is, the first terminal 510 and the second terminal 520 may perform data transmission and reception for a vehicle communication service through a base station (Uu interface). That is, the first terminal 510 and the second terminal 520 may exchange data for a vehicle communication service with each other through UL data transmission and DL data reception.
  • the third terminal (V2X UE3, 530) and the fourth terminal (V2X UE4,540) may be located outside the network coverage.
  • the third terminal 530 and the fourth terminal 540 when the third terminal 530 and the fourth terminal 540 are in a position where communication between the first terminal 510 and the second terminal 520 is not possible, the third terminal 530 and the fourth terminal 540 cannot exchange data for a vehicle communication service with the first terminal 510 and the second terminal. That is, a terminal in a location where a physical signal cannot reach may not be able to communicate with other terminals, base stations, servers, and the like.
  • the fourth terminal 540 outside the network coverage needs to access the network for a vehicle communication service or a commercial service.
  • the RSU Road Side Unit 560
  • the RSU performs a relay function, so that the fourth terminal 540 outside the network coverage communicates with the base station through an indirect path. Data can be transmitted and received.
  • the RSU 560 may be a UE type.
  • the RSU 560 may be of other types and is not limited to the above-described embodiment.
  • the RSU 560 serves as a relay so that the fourth terminal 540 can transmit vehicle communication service data to the RSU 560 through the side link SL.
  • the RSU 560 may transmit the vehicle communication service data to the base station 550 using uplink (UL) transmission through the Uu interface.
  • the first terminal 510 and the second terminal 520 from the base station 550 may receive vehicle communication service data of the fourth terminal 540. That is, the terminal located outside the network coverage may perform data transmission to terminals within the network coverage through a relay terminal such as an RSU and a base station of the relay terminal.
  • FIG. 6 is a diagram illustrating a V2X communication scenario.
  • the fourth terminal V2X UE4, 640 may transmit data to the RSU 660 as described above.
  • the data may be vehicle communication service data as described above.
  • the third terminal (V2X UE3, 630) may be a terminal capable of sidelink communication with the RSU 660, although it exists in a position where communication with the fourth terminal 640 is impossible. At this time, the third terminal 630 also needs to check the data of the fourth terminal 640.
  • the RSU 660 is configured to transmit data received from the fourth terminal 660 to the base station 650 through the Uu interface (LTE or NR uplink).
  • the RSU 660 may transmit data to the base station 650, and data transmission may be performed through sidelink communication to reduce a delay time that occurs while it is transmitted to the RSU 660 again.
  • the RSU 660 may operate in a mode controlled by a base station or in a terminal autonomous determination mode, which will be described later.
  • data received from the fourth terminal 640 is determined to be included in buffer status reporting (BSR) for transmission in LTE or NR, and at the same time. It may be determined as data to be included in the link (SL) BSR. That is, the vehicle communication service data received from the above-mentioned fourth terminal 640 is transmitted to the PDCP/RLC layer in the RB (radio bearer) of the LTE side, and the same information is also delivered to the PDCP/RLC layer in the RB of the sidelink side. You can.
  • BSR buffer status reporting
  • the PPPP ProSe Priority per Packet
  • the RSU 660 can configure a new RB supporting priority to transmit the packet by itself, and is limited to the above-described embodiment Does not work.
  • an operation mode may be defined according to a resource allocation method for control information and data transmission for V2X communication or direct link (e.g. D2D, ProSe, or SL) communication.
  • the NR V2X system also performs network scheduling mode (eg mode 1) for resource setting and scheduling from the base station, and non-network scheduling mode (eg mode 2), in which the transmitting terminal finally determines resources without network scheduling. ) May be present.
  • the network scheduling mode (e.g. mode 1) may be a mode in which the base station schedules sidelink physical resources for NR V2X sidelink communication.
  • the base station means 3GPP NG-RAN and may be gNB or ng-eNB.
  • the base station uses the PDCCH (DCI format for NR V2X SL) to control the NR V2X sidelink communication directly within the corresponding base station coverage based on the sidelink resource allocation request received from each terminal. Data scheduling for sidelink physical resources can be performed directly.
  • non-network scheduling mode may be a mode in which the terminal directly selects and uses sidelink physical resources (without base station scheduling) within pre-configured resources or resources set by the base station.
  • a sub-mode may exist as shown in Table 3 below.
  • each sub-mode is a mode in which the terminal automatically selects a sidelink physical resource, a mode in which the terminal assists in selecting sidelink physical resources of other terminals, and the terminal performs sidelink transmission on a predetermined sidelink physical resource.
  • the mode or the terminal may be set to any one of modes for scheduling sidelink physical resources of other terminals, but is not limited thereto.
  • mode 2-1 mode the terminal itself can sense the required resource and directly determine the resource to perform NR V2X sidelink communication.
  • One representative terminal can assist in performing resource selection of other transmitting terminals by providing guides or information necessary for scheduling resources for NR V2X sidelink communication of other terminals.
  • -mode 2-3 (a mode in which a terminal performs sidelink transmission on a preset sidelink physical resource)
  • the UE may be in a mode for performing sidelink transmission among sidelink physical resources preset in advance or sidelink physical resources broadcast from a base station or indicated through a designated RRC message.
  • the base station resource scheduling mode uses resources used by the terminal to transmit V2X (or direct link) control information and/or data. It may be a mode scheduled by a base station or a relay node. Through this, the terminal may transmit V2X (or direct link) control information and/or data, and this mode may be the base station resource scheduling mode.
  • the base station may be an eNB. Further, as an example, the base station may be a gNB or ng-eNB as ng-ran, and is not limited to the above-described embodiment. Referring to (a) of FIG.
  • the base station 710 transmits scheduling information for resources to be used for data transmission through downlink control information (DCI) as a sidelink (or direct link) transmission terminal (UE A). , 720).
  • DCI downlink control information
  • the sidelink (or direct link) transmitting terminal 720 may transmit sidelink (or direct link) control information (SCI) and data to the sidelink (or direct link) receiving terminal (UE B, 730).
  • the sidelink (or direct link) receiving terminal (UE B, 730) may receive the sidelink (or direct link) data based on the sidelink (or direct link) control information (SCI), the above-described implementation It is not limited to examples.
  • UE autonomous resource selection mode uses resources used by the UE to transmit control information and data.
  • the terminal selects itself, and the resource selection may be determined by the terminal sensing or the like in a resource pool (ie, a set of resource candidates). Through this, the terminal can transmit control information and data, and this mode may be a terminal autonomous resource selection mode.
  • the sidelink (or direct link) transmitting terminal (UE A, 740) is the sidelink (or direct link) receiving terminal (UE B, 750) sidelink (or direct link) control information from the resource of their choice and Data can be transferred.
  • the side link (or direct link) receiving terminal 750 may receive side link (or direct link) data based on the side link (or direct link) control information.
  • the terminal autonomous resource selection mode there may be a mode in which the terminal automatically selects a sidelink physical resource. At this time, the terminal may perform a NR V2X sidelink operation by directly sensing resources required by itself and determining resources.
  • the terminal can assist in the selection of sidelink physical resources of other terminals. At this time, one representative terminal can contribute to performing resource selection of other transmitting terminals by providing guides or information necessary for scheduling resources for NR V2X sidelink communication of other terminals.
  • a mode in which a terminal performs sidelink transmission on a pre-configured sidelink physical resource may exist.
  • the terminal may be a mode for performing sidelink transmission among sidelink physical resources previously set or broadcast from a base station or sidelink physical resources indicated through a designated RRC message.
  • a mode in which a terminal schedules sidelink physical resources of other terminals may exist.
  • the other terminal operates almost similarly to the base station, and can perform scheduling for sidelink physical resources of other transmitting terminals.
  • the above-described base station resource scheduling mode may be referred to as mode 3 (Mode 3) in sidelink (or direct link) communication for V2X.
  • the terminal autonomous resource selection mode may be referred to as mode 4 in sidelink communication for V2X or the like.
  • mode 3 Mode 3
  • mode 4 in sidelink communication for V2X or the like.
  • mode 1 and mode 2 for convenience of description, but are not limited thereto.
  • the present invention may be equally applied to communication based on a direct link such as D2D, ProSe, etc., and is not limited to the above-described embodiment.
  • the terminal may perform V2X sidelink communication even in an RRC idle (RRC IDLE) state, (RRC CONNECTED) state, or outside network coverage. More specifically, since the mode 1 terminal performs V2X sidelink communication through the scheduling resource received from the base station, it can operate in an RRC connected state.
  • the mode 2 terminal can perform V2X sidelink communication by selecting a V2X sidelink resource within a preconfigured resource without base station scheduling.
  • the mode 2 terminal may perform side-to-side V2X communication by selecting a sidelink resource from among resources set by the base station. That is, the mode 2 terminal can perform V2X sidelink communication even outside the RRC CONNECTED state, RRC IDLE state, or network coverage.
  • the terminal may receive system information broadcast by the base station in the RRC idle state.
  • the terminal may perform V2X sidelink communication using information included in the broadcasted system information.
  • the V2X terminal can exchange data with the base station.
  • the base station can control the transmission resource of the terminal, and the terminal can perform V2X sidelink communication based on this.
  • NR V2X can support advanced V2X services in addition to the services supported by LTE V2X.
  • the advanced V2X service may be cluster driving, remote driving, high-level driving, or sensor extension.
  • the above services are services requiring low latency and high reliability, and in order to meet such strict requirements, it is necessary to develop an improved NR system and new NR sidelink technology.
  • a scenario for an advanced V2X service will be described.
  • platforming may be considered as a new service.
  • a leader may exist in the cluster.
  • the leader of the cluster needs to report the surrounding traffic data to the group members in real time.
  • Group members also need to exchange information in real time within the group.
  • vehicle A may be the group leader.
  • group members share real-time traffic information and road information around the vehicle, and vehicle A may report all information to a road side unit (RSU).
  • RSU road side unit
  • vehicle A may share information received from RSU to group members B, C, and D.
  • vehicles B, C, and D that have received the above-described information as a vehicle (or terminal) in a group may perform an update for driving.
  • a driving map may be updated in real time, a speed may be reduced, and a route may be changed.
  • advanced driving may be considered as a V2X service.
  • control information for altitude driving may be exchanged.
  • motions such as cooperative collision avoidance (CoCA) of connected automated vehicles, vehicle CAM, DENM safety messages, sensor data, braking and acceleration commands, the probability of accidents is better evaluated and adjusted.
  • Control information may be exchanged between vehicles in order to be possible.
  • the above-described information can be used to adjust the road traffic flow through 3GPP V2X communication in the application.
  • terminal A detects the danger through an application, and a message related to CoCA through V2X communication (orbit, sensor data, brake command, etc.) Can be exchanged.
  • Terminals B and C can adjust the speed and change the location by checking the CoCA information of terminal A by receiving the above-described message.
  • the network can allow the terminal to exchange messages with 99.99% reliability. That is, smooth data processing and high reliability may be required.
  • a cooperative operation is required to share a rough driving intention, such as cooperative recognition and lane change to share the detected objects between vehicles in the same area. Can.
  • regional collaborative recognition can be defined as sharing regional awareness data (abstracted data and/or high resolution sensor data) using V2X communication to extend the onboard sensor function of sensing in general.
  • each vehicle and/or RSU may share its perception data obtained from its local sensor (eg, camera, LIDAR, radar, etc.) with a nearby vehicle.
  • the cooperative operation may be basically defined as adjacent vehicles sharing their driving intention.
  • each vehicle may share a detected object (eg, abstract object information detected by a sensor) and/or driving intention with another vehicle.
  • a detected object eg, abstract object information detected by a sensor
  • each vehicle can obtain information about surrounding objects that cannot be obtained only from a local sensor and the intention of driving other adjacent vehicles. In this case, road safety and traffic efficiency can be improved.
  • This operation requires low delay and high reliability, and therefore, in NR V2X, it must be able to transmit and receive messages directly or via RSU between terminals.
  • a broadcast method or a multicast method, or periodic information exchange may be used.
  • cooperative autonomous driving can be supplemented through the “Emergency Trajectory Alignment (EtrA)” message between terminals in consideration of dangerous situations. Motion cooperation through EtrA can help drivers drive safely in dangerous situations. That is, the EtrA message may include sensor data and status information with specific information for cooperative avoidance adjustment for safe security in preparation for unexpected road conditions.
  • the vehicle may calculate an operation for avoiding an accident based on the information.
  • the vehicle can inform this vehicle to other vehicles through V2X communication.
  • V2X may need to enable communication between terminals with [3] ms end-to-end delay and [99.999]% reliability and low data rate [30] Mbps within the communication range of [500] m. .
  • a lane change scenario based on cooperation between terminals may be considered.
  • information exchange between vehicles may be necessary for safe and efficient lane change.
  • vehicle A may want to change the lane to an adjacent lane between vehicles B and C.
  • Vehicle A may notify vehicles B and C of changing lanes and request generation of a gap.
  • Vehicles B and C which have received the message, confirm that they will make the gap according to the request and can inform vehicle A of this.
  • Vehicle A which has received the message, may move lanes. Such an operation may be supported through message exchange between terminals.
  • an extended sensor may be considered.
  • sensors and video information between terminals (or vehicles) may be shared.
  • the driver's visual range may interfere with some road traffic situations, such as driving a truck in front.
  • Video data transmitted from one vehicle to another can assist the driver in this safety-critical situation.
  • video data can be collected and transmitted via a possible UE-type RSU.
  • the extension sensor allows the exchange of raw or processed data collected from local sensors or live video data between vehicles, RSUs, pedestrian devices and V2X application servers between vehicles.
  • the vehicle can improve environmental awareness beyond what its sensors can detect, and can better understand the local situation.
  • sharing high-resolution video data allows the driver to drive according to safety preferences, but when sharing low-resolution video data, it may not be sufficient to drive because obstacles may not be visible and overlooked.
  • this operation requires low delay and high reliability.
  • an operation that enables communication between terminals with a [10] Mbps data rate, [50] ms latency, and [90]% reliability is required.
  • V2X service In order to support the V2X service as described above, low latency and high reliability may be required. At this time, a method for supporting multiple modes may be required in consideration of the above-described V2X service, which will be described later.
  • V2X terminals 820 and 830 may be configured as a V2X application and a communication protocol stack. At this time, communication between V2X terminals 820 and 830 may be possible through a PC5 link. In addition, communication between V2X applications may be possible through a V5 link.
  • the terminal 820 may perform transmission according to the setting in the application layer. That is, the application layer of the terminal may set priority information, QoS information, and the like for the generated V2X message, and then transmit the above-described information together with the V2X message to the Access Stratum (AS) layer.
  • AS Access Stratum
  • the AS layer receiving the above-described configuration information and the V2X message can check the priority and reliability of the V2X message and map the V2X message to an appropriate Sidelink Radio Bearer (SLRB).
  • SLRB Sidelink Radio Bearer
  • the PDCP, RLC, MAC, and PHY layers of the UE receive the V2X message, prepare to transmit the message, and perform the transmission.
  • V2X communication may be performed through a base station or may be achieved through direct communication between terminals.
  • transmission and/or reception may be performed through a Uu link, which is a communication interface between the base station and the terminal of LTE.
  • Uu link which is a communication interface between the base station and the terminal of LTE.
  • PC5 link is a communication interface between the terminal and the terminal of LTE.
  • the sidelink field of 5G may include both a sidelink in an LTE system and a sidelink in an NR system.
  • the side link field may be an essential field for improving performance through ultra-high reliability and ultra-low delay and grafting new and diverse services.
  • V2X For the convenience of description, the following describes the operation and related information for V2X based on the NR system. However, the following features may not be limited to a specific system, and may be equally applied to other systems, and are not limited to the above-described embodiment. As an example, the following description may also be applied to an operation for LTE V2X, and is not limited to the above-described embodiment.
  • a V2X terminal is referred to as a “terminal” as a terminal supporting vehicle communication.
  • terminal may be a terminal supporting vehicle communication, but is not limited thereto. That is, the following description is based on a terminal supporting vehicle communication in consideration of V2X service, but is not limited thereto, and the following methods may be equally applied to a terminal supporting multiple modes.
  • the V2X service needs to be secured with high reliability due to service characteristics. That is, considering that it is a V2X service that is directly connected to the life of the driver and the pedestrian, the terminal can perform V2X sidelink communication in the RRC idle state or outside network coverage as well as the RRC connection state.
  • the terminal may perform V2X sidelink communication based on the mode 2 operation even in the case of the RCE idle state.
  • the terminal may request the RRC connection setting and switch to the RRC connection state, so that the V2X sidelink communication is continuously performed.
  • the terminal may determine that V2X sidelink communication is impossible.
  • the terminal can perform V2X sidelink communication by requesting the RRC connection establishment to the base station and switching to the RRC connection state.
  • the terminal in the RRC connected state may switch to the RRC idle state and select a resource by itself to perform V2X sidelink communication.
  • the terminal may switch to the RRC idle state and select a resource by itself to perform V2X sidelink communication.
  • a radio link failure RLF
  • the UE switches to the RRC idle state and performs the UE based on the mode 2 operation.
  • V2X sidelink communication can be performed by selecting a resource by itself.
  • the mode of the terminal may also be changed.
  • the mode 2 which is the terminal autonomous resource selection mode, may operate. Therefore, when switching from the RRC connected state to the RRC idle state, the terminal operating based on the mode 1 may be changed to the mode 2.
  • the terminal when switching from the RRC idle state to the RRC connected state, the terminal may operate by changing to mode 1 or mode 2 according to the setting of the base station.
  • the mode of the terminal may be changed even when the RRC state is not switched.
  • the UE may report a Channel Busy Ratio (CBR) of the sidelink resource pool to the base station.
  • CBR refers to the congestion of a resource pool. If the CBR measurement result shows a high value, it can be seen that many terminals are using the resource pool. On the other hand, when the result of the CBR measurement shows a low value, it can be seen that there are fewer terminals using the corresponding resource pool, and thus the terminal can perform smooth V2X sidelink communication in the resource pool.
  • the base station can adjust the resource pool for the terminal or change the resource allocation mode of the terminal so that V2X sidelink communication can be performed smoothly according to the CBR report. That is, even when the RRC state is not switched, the resource allocation mode of the terminal may be changed.
  • the resource allocation mode of the terminal may be changed.
  • some of the services (or carriers) may be performed through V2X sidelink communication only through base station scheduling resources.
  • the terminal may use a commercial frequency, and when using the commercial frequency, the base station may not configure the mode 2 resource pool for the above-described service to operate only by base station scheduling according to the policy of the operator. Therefore, the terminal should perform V2X sidelink communication by switching to mode 1 when the above-described service is provided, and may operate based on this.
  • the terminal may change the resource allocation mode to perform V2X sidelink communication.
  • the resource allocation mode may be changed.
  • the resource allocation mode may not be changed to prevent additional delay.
  • the terminal may need to additionally select a carrier and a related resource pool to transmit a packet for the new service.
  • a specific service a service supported only in e.g.
  • a base station scheduling resource may be required. That is, in the above-described case, there is a need to change the resource allocation mode of the terminal operating in mode 2. At this time, the resource allocation mode of the terminal may be switched from mode 2 to mode 1. However, if the terminal is performing transmission through the V2X sidelink based on the mode 2 operation, it is necessary to stop all transmissions for mode switching, release reserved sidelink resources, and switch to mode 1. That is, the terminal performs the above-described operation in consideration of a specific service to switch to mode 1, and may perform V2X sidelink transmission to the mode 1 resource through a base station scheduling resource request.
  • transmission may be stopped and additional transmission may be performed by changing the mode. Therefore, unnecessary additional delay may be required by the above-described operation.
  • the terminal may support both mode 1 and mode 2, which will be described later.
  • the base station may set the operation mode of the terminal in the RRC CONNECTED state.
  • the base station may be configured to operate the terminal in the RRC connection state in mode 1.
  • the base station may be configured to operate the terminal in the RRC connected state in mode 2.
  • the base station may be configured to operate the terminal in the RRC connection state in mode 1 and mode 2.
  • the base station may indicate the operation mode of the V2X terminal through an RRC connection reconfiguration message.
  • the base station may transmit an RRC connection reconfiguration message to the terminal to provide configuration information necessary for sidelink V2X operation of the terminal after the terminal completes the RRC connection setup.
  • the base station may transmit an RRC connection reconfiguration message to the terminal when the resource pool is reconfigured or the frequency is reconfigured. If the terminal receiving the RRC connection reconfiguration message can follow the configuration information in the message, after completing the relevant settings, the terminal may transmit an RRC connection reconfiguration complete message to the base station.
  • the terminal may perform sidelink transmission through the base station scheduling resource based on the base station indication.
  • the RRC connection reconfiguration message includes SL-V-RNTI (Sidelink V2X Radio Network Temporary Identifier), MAC (Media Access Control) configuration information, and mode 1 resource At least one or more of pool information, MCS information, and logical channel group configuration information may be included.
  • the SL-V-RNTI may be an ID of a V2X terminal used for radio resource allocation through a Uu link that is a radio interface between a base station and a V2X terminal.
  • the UE may be provided with resource allocation information for the sidelink through Downlink Control Information (DCI) included in the Physical Downlink Control Channel (PDCCH).
  • DCI Downlink Control Information
  • SL-V-RNTI may be used to confirm that the DCI is for the corresponding terminal.
  • the terminal receives information about a resource included in a corresponding transmission resource pool among time/frequency resources constituting an entire carrier, and the MCS value set by default in the physical layer for data transmitted through a side link Can receive.
  • the terminal may receive a priority value included in a logical channel group to which the logical channel corresponding to each radio bearer belongs.
  • the logical channel group is determined according to the priority, and the logical channel group is a basic unit for reporting the buffer status when the V2X terminal reports Buffer Status Reporting (BSR) for the sidelink transmitted to the base station.
  • BSR Buffer Status Reporting
  • the terminal may receive information necessary to operate in mode 1 through the RRC connection reconfiguration message, and based on this, the sidelink transmission may be performed through the base station scheduling resource.
  • the terminal selects a sidelink resource by itself in a carrier configured with a mode 2 resource pool according to the base station instruction and transmits the sidelink.
  • the RRC connection reconfiguration message may include information necessary for the terminal to operate in mode 2.
  • the RRC connection reconfiguration message may include mode 2 resource pool information and configuration information for performing sensing.
  • the UE can measure the occupancy of the resource through sensing within the selected resource pool.
  • the terminal may reduce the probability of packet collision by selecting a resource determined that the other terminal has not occupied according to the sensing result. That is, the terminal may receive information necessary to operate in mode 2 through the RRC connection reconfiguration message, and based on this, select the sidelink resource and perform transmission.
  • the terminal may transmit some packets through the base station scheduling resource according to the base station indication. In addition, the terminal may perform transmission by selecting a resource by itself for some other packets.
  • the RRC connection reconfiguration message may include both information related to mode 1 operation and information related to mode 2 operation. That is, the base station may indicate that the UE simultaneously supports mode 1 and mode 2 operations through an RRC connection reconfiguration message.
  • the RRC connection reconfiguration message includes the terminal with SL-V-RNTI, MAC configuration information, mode 1 resource pool information and logical channel group configuration information required for mode 1 operation. It may include mode 2 resource pool information and sensing configuration information required for mode 2 operation.
  • Table 4 may indicate information required when operating in mode 1 (eg scheduled) and information required when operating in mode 2 (eg ue-selected) as “SL-V2X-ConfigDedicated Information Element”. have.
  • necessary information e.g. scheduled & ue-selected
  • necessary information may be configured when operating in both mode 1 and mode 2 as described above, and is not limited to the above-described embodiment.
  • the terminal may determine a specific condition to use the mode 1 operation. At this time, the terminal may operate based on the mode 2 when it is not a specific condition for using the mode 1 operation. More specifically, specific conditions for the mode 1 operation may be determined based on the CBR measurement result value for the resource pool of each mode. That is, when the terminal receives an indication that both mode 1 and mode 2 operations are possible from the base station, the terminal can know both mode 1 resource pool and mode 2 resource pool information based on the RRC connection reconfiguration message. At this time, the UE can perform CBR measurement for each resource pool. At this time, the UE can compare the measured CBR value for each resource pool.
  • a specific condition may be a comparison value for CBR for each resource pool.
  • FIG. 9 is a diagram illustrating a method in which a mode is selected based on CBR.
  • the base station may configure the terminal to support both mode 1 and mode 2 at the same time.
  • the base station may indicate that the mode 1 and mode 2 are indicated in the RRC connection reconfiguration message.
  • the RRC connection reconfiguration message may include mode 1 related information and mode 2 related information.
  • the terminal may measure the CBR for the mode 1 resource pool and the mode 2 resource pool based on the information included in the RRC connection reconfiguration message.
  • S930 At this time, as described above, the terminal is in mode 1 You can compare the CBR of a resource pool to the CBR of a mode 2 resource pool.
  • the UE may perform sidelink transmission based on the mode 1 (S950), whereas the CBR of the mode 1 resource pool If it is not lower than the CBR of the mode 2 resource pool (S940), the UE may perform sidelink transmission based on the mode 2, as described above (S960).
  • a CBR measurement result value of a mode 1 resource pool and a CBR measurement result value of a mode 2 resource pool may be compared with respective threshold values.
  • the CBR measurement result value of the mode 1 resource pool may be compared with a threshold for the CBR of the mode 1 resource pool. For example, when the result of the CBR measurement of the mode 1 resource pool is not lower than the threshold, the UE may operate based on mode 2 for the corresponding logical channel. On the other hand, when the CBR measurement result value of the mode 1 resource pool is lower than the threshold, the UE can compare the CBR measurement result value of the mode 2 resource pool with the threshold value for the CBR of the mode 2 resource pool.
  • the terminal may operate in mode 2 for the corresponding logical channel.
  • the terminal may operate in mode 1 for the corresponding logical channel. That is, only when the CBR measurement result value of the mode 1 resource pool is lower than a specific threshold and the CBR measurement result value of the mode 2 resource pool is higher than the specific threshold, the UE can operate in mode 1 for the corresponding logical channel. .
  • the terminal can operate in mode 2.
  • the base station may set the above-described threshold for the CBR of the mode 1 resource pool and the threshold for the CBR of the mode 2 resource pool through an RRC connection reconfiguration message.
  • the terminal when the terminal supports both mode 1 and mode 2, the terminal may basically operate based on mode 2, but based on mode 1 as described above based on CBR measurement values for each resource pool It can work.
  • the RRC connection reconfiguration message may include only configuration information for mode 2.
  • the RRC connection reconfiguration message includes information indicating that the terminal supports both mode 1 and mode 2, and may include only configuration information for mode 2. That is, the configuration information for mode 1 may not be included in the RRC connection reconfiguration message.
  • the UE may measure the CBR for the mode 2 resource pool and compare it with a threshold. At this time, if the CBR measurement value is lower than the threshold value, the terminal may perform sidelink communication based on the mode 2.
  • the terminal may transmit a CBR measurement value and/or mode 1 operation request message to the base station.
  • the terminal may use a sidelinkUEInformation message.
  • a new parameter may be defined for the mode 1 operation request, for example, the above-described parameter may have a value of 0 or 1 as “mode1Request”. When the mode1Request value is 1, it may indicate a mode 1 operation request.
  • the mode1Request value when the mode1Request value is 0, it may indicate that the mode 2 operation, which is the basic operation mode, is to be followed.
  • the above-described parameter may be included in the sidelinkUEInformation message, and the above-described parameter value may be set to 1.
  • the base station may transmit an RRC connection reconfiguration message including mode 1 configuration information to the terminal when receiving the sidelinkUEInformation message including the above-described information. Based on this, the terminal may perform sidelink transmission based on the mode 1 operation. That is, even if the terminal is set to support both mode 1 and mode 2, the terminal basically operates in mode 2, and in exceptional cases, can operate in mode 1. To this end, the terminal may receive mode 1 configuration information through an additional RRC connection reconfiguration message and operate based on this.
  • the terminal may determine a mode of operation in consideration of the quality of service (QoS) of the packet. For example, when a sidelink transmission is performed through a mode 2 operation in which the terminal selects a resource by itself, a collision with another terminal may occur in the corresponding resource. Accordingly, in the case of a packet requiring high reliability in consideration of the QoS of the packet, sidelink transmission may be performed based on the mode 1 operation to increase the reliability of packet transmission by reducing the probability of collision with another terminal. For example, when the QoS of a packet is greater than or equal to a threshold (or threshold), the UE may perform sidelink transmission based on the mode 1 operation. On the other hand, if the QoS of the packet is less than a threshold (or threshold) and is not a packet requiring high reliability, the UE may perform sidelink transmission based on the mode 2 operation.
  • QoS quality of service
  • the terminal when the terminal selects a resource by itself and performs transmission, the terminal may operate without signaling the base station. Accordingly, in the case of a packet requiring low latency, the terminal can separately request a base station scheduling resource and perform transmission on a resource selected by the terminal without waiting time. Accordingly, the terminal may select the mode 2 operation to reduce the delay of packet transmission.
  • the terminal when the terminal supports both mode 1 and mode 2, the terminal may determine a mode of operation in consideration of a packet transmission rate. For example, it may be necessary for a terminal to simultaneously transmit data stored in a logical channel through multiple carriers to satisfy a packet transmission rate. That is, the number of carriers to be guaranteed at least for one logical channel may be determined. As an example, a case in which N carriers should be guaranteed for packet transmission according to a terminal implementation may be considered. However, this is only one example and is not limited to the above-described embodiment.
  • the UE can determine the mode in which N carriers are satisfied by checking the mode 1 and mode 2 resource pool configuration information of the carrier.
  • a specific service can be supported by multiple carriers, but for the above-described service, some carriers are configured with only mode 1 resource pools, and some carriers have mode 1 and mode 2 resource pools. have.
  • the terminal may perform sidelink transmission based on the mode 1 operation.
  • the terminal may perform sidelink transmission based on the mode 2 operation. That is, the terminal can perform sidelink transmission through a mode in which N carriers are satisfied as the number of carriers to be guaranteed.
  • the terminal when the terminal determines to operate in mode 1 in transmitting data stored in the logical channel, the terminal reports the amount of data stored for the logical channel to the base station through the BSR. Can. Thereafter, after receiving the sidelink resource from the base station, the terminal may perform V2X sidelink transmission using the received resource.
  • the terminal when the terminal decides to operate in mode 2 when transmitting logical channel data, the terminal can select a resource by itself through transmission carrier and resource pool selection for the logical channel to transmit the packet to the V2X sidelink. .
  • the base station may configure a plurality of resource pools on one carrier.
  • the above-described resource pool may be configured according to the service.
  • a resource pool used in mode 1 operation and a resource pool used in mode 2 operation may be configured, respectively. That is, the base station can support a plurality of services through one carrier, and can determine a carrier to be used and a resource pool of the corresponding carrier according to the service.
  • FIG. 10 is a diagram showing a method of supporting multiple modes. Referring to FIG. 10, the base station may set a terminal capable of simultaneously supporting mode 1 and mode 2 (S1010).
  • the base station performs information related to mode 1 operation and mode 2 operation in the RRC connection reconfiguration message. By including information related to it can be transmitted to the terminal that supports the mode 1 and mode 2 at the same time.
  • a packet for a specific service may be generated in a terminal that simultaneously supports mode 1 and mode 2 (S1020).
  • S1020 mode 1 and mode 2
  • only one mode may be supported for a specific service.
  • only one mode may be supported for one service. Therefore, only one mode can be supported for one logical channel.
  • the terminal may allow some packets to operate through mode 1 for one logical channel (or one service).
  • the terminal may allow some other packets to operate through mode 2 for one logical channel (or one service). At this time, the terminal transmits through mode 1 for some packets, and only for some data Resources can be requested to the base station through the BSR. However, the UE may have an unclear criterion for up to which data the base station resource should be requested through the BSR. In addition, when the terminal reports all the data for the logical channel to the base station through the BSR, the reporting of unnecessary parts may result in resource waste.
  • the terminal may support only one mode for one logical channel.
  • the base station may configure a carrier and a resource pool for the corresponding service.
  • a plurality of services can be supported on the carrier, and each resource pool of the carrier is in a different mode. It can be configured to support. However, as described above, only one mode can be supported for one service, and a method of configuring each carrier based on this can be described, which will be described later.
  • the mode may be selected in consideration of the carrier configuration for the corresponding service. (S1040) Thereafter, the terminal may perform V2X sidelink transmission based on the selected mode (S1050).
  • mode selection may be performed differently according to the above-described carrier configuration.
  • the terminal may support both mode 1 and mode 2.
  • the base station may indicate that the terminal simultaneously supports mode 1 and mode 2 through an RRC connection reconfiguration message.
  • packets for a specific service may be generated in a terminal capable of simultaneously supporting Mode 1 and Mode 2.
  • the specific service may be the first service, and the first service may be used to refer to the specific service.
  • the terminal can confirm the configuration of the first carrier supporting the first service.
  • the first carrier may be configured as a mode 1 resource pool.
  • the base station may use the first carrier for the first service and configure the carrier to operate only in mode 1.
  • the terminal may request a scheduling resource by reporting the BSR to the base station for the logical channel in which the packet for the first service is stored. Thereafter, the terminal may receive a sidelink resource from the base station and transmit a packet stored in the corresponding logical channel.
  • a packet for a specific service may be generated in a terminal capable of simultaneously supporting mode 1 and mode 2 according to a base station configuration.
  • the specific service may be the second service, and the second service may be used to refer to the specific service.
  • the terminal can confirm the configuration of the second carrier supporting the second service.
  • the second carrier may consist of both a mode 1 resource pool and a mode 2 resource pool. Based on the above, since both the mode 1 resource pool and the mode 2 resource pool are configured for the second service in the second carrier, the terminal can know that both the mode 1 operation and the mode 2 operation are possible. At this time, the terminal may select a mode 1 resource pool or a mode 2 resource pool.
  • the terminal may select mode 1 to perform a BSR to the base station on a logical channel in which packets for the second service are stored, and perform packet transmission through scheduling resources.
  • the terminal may select mode 2 to select a transport carrier and a resource pool for the logical channel, and perform packet transmission through the resource selected by the terminal itself.
  • the terminal since the terminal can operate in both mode 1 and mode 2, one mode can be selected.
  • the terminal may operate based on the mode 1 when a specific condition is satisfied based on the CBR measurement value.
  • the terminal could operate in mode 2 when it is not the above-described specific condition, as described above.
  • the terminal may select a mode in consideration of the QoS of the packet, as described above.
  • one service may be supported by multiple carriers in consideration of carrier load balancing. That is, a case in which one service operates based on multicarriers may be considered.
  • the terminal may perform transmission through one carrier, or may perform transmission through multiple carriers, and is not limited to the above-described embodiment.
  • a packet for a specific service may be generated in a terminal capable of simultaneously supporting mode 1 and mode 2 according to the base station configuration as described above.
  • the specific service may be a third service, and the third service may be used to refer to a specific service.
  • the terminal can confirm the configuration of the third carrier and the fourth carrier supporting the third service.
  • the third carrier and the fourth carrier may be configured as a mode 1 resource pool. Therefore, the terminal may request scheduling resources to the base station by performing BSR with the base station on the logical channel in which the packet for the third service is stored based on the operation of mode 1. Thereafter, the terminal may receive a sidelink resource from the base station and transmit a packet stored in the logical channel through one carrier or multiple carriers.
  • a packet for a specific service may occur in a terminal capable of simultaneously supporting mode 1 and mode 2 according to the base station configuration.
  • the specific service may be the fourth service, and the fourth service may be used to refer to the specific service.
  • the terminal can confirm the configuration of the fifth carrier and the sixth carrier supporting the fourth service.
  • the fifth carrier and the sixth carrier may be configured as a mode 1 resource pool and a mode 2 resource pool. Accordingly, the terminal may select a mode 1 resource pool or a mode 2 resource pool. That is, the terminal may select mode 1 to perform a BSR to the base station on the logical channel in which the packet for the fourth service is stored, and perform packet transmission through the scheduling resource.
  • the terminal may select mode 2 to select a transport carrier and a resource pool for the logical channel, and perform packet transmission through the resource selected by the terminal itself.
  • the terminal since the terminal can operate in both mode 1 and mode 2, one mode can be selected.
  • the terminal may operate based on the mode 1 when a specific condition is satisfied based on the CBR measurement value.
  • the terminal could operate in mode 2 when it is not the above-described specific condition, as described above.
  • the terminal may select a mode in consideration of the QoS of the packet, as described above.
  • a packet for a specific service may occur in a terminal capable of simultaneously supporting mode 1 and mode 2 according to the base station configuration.
  • the specific service may be the fifth service, and the fifth service may be used to refer to the specific service.
  • the terminal can check the configuration of the seventh carrier and the eighth carrier supporting the fifth service.
  • the seventh carrier may be configured as a mode 1 resource pool.
  • the eighth carrier may be configured as a mode 1 resource pool and a mode 2 resource pool. That is, resource pools configured in a plurality of carriers may be different for one service.
  • the terminal transmits up to what data through the BSR.
  • the criteria for whether to request base station resources may be unclear. Therefore, the terminal can support only one mode for one service, as described above.
  • the terminal may select mode 1 or mode 2.
  • the terminal may report the BSR and receive resource allocation from the base station to perform sidelink transmission through the 7th carrier and the 8th carrier.
  • the terminal may perform an operation based on the mode 2 through the eighth carrier configured with the resource pool for the mode 2.
  • the terminal when the terminal selects a mode, the terminal may operate based on the mode 1 when a specific condition is satisfied based on the CBR measurement value. In addition, as an example, the terminal could operate in mode 2 when it is not the above-described specific condition, as described above. In addition, as an example, the terminal may select a mode in consideration of the QoS of the packet, as described above. In addition, as an example, the terminal may select a mode in consideration of a packet transmission speed, as described above. That is, after performing the mode selection, the terminal may perform sidelink transmission by moving the resource pool of the carrier corresponding to the selected mode.
  • FIG. 11 is a view showing the configuration of a base station apparatus and a terminal apparatus according to the present disclosure.
  • the base station apparatus 1100 may include a processor 1120, an antenna unit 1112, a transceiver 1114, and a memory 1116.
  • the processor 1120 performs baseband-related signal processing, and may include an upper layer processor 1130 and a physical layer processor 1140.
  • the upper layer processing unit 1130 may process operations of a medium access control (MAC) layer, a radio resource control (RRC) layer, or higher layers.
  • the physical layer processor 1140 may process operations of a physical (PHY) layer (eg, uplink reception signal processing, downlink transmission signal processing, sidelink transmission signal processing, and sidelink reception signal processing). .
  • the processor 1120 may control overall operation of the base station apparatus 1100.
  • the antenna unit 1112 may include one or more physical antennas, and when a plurality of antennas are included, may support MIMO (Multiple Input Multiple Output) transmission and reception.
  • the transceiver 1114 may include a radio frequency (RF) transmitter and an RF receiver.
  • the memory 1116 may store information processed by the processor 1120, software related to the operation of the base station apparatus 1100, an operating system, an application, and may include components such as a buffer.
  • the processor 1120 of the base station apparatus 1100 may indicate a resource allocation mode of the terminal apparatus 1150.
  • the processor 1120 of the base station apparatus 1100 may indicate a resource allocation mode of the terminal apparatus 1150 through an RRC connection reconfiguration message.
  • the processor 1120 of the base station device 1100 may instruct the terminal device 1150 to support both mode 1 and mode 2.
  • the processor 1120 of the base station device 1100 may include and transmit both mode 1 related information and mode 2 related information in an RRC connection reconfiguration message. And is as described above.
  • the processor 1120 of the base station apparatus 1100 may receive a BSR report when the terminal apparatus 1150 operates based on mode 1 and allocate resources to the terminal apparatus 1150 based on the BSR report. Further, the processor 1120 of the base station apparatus 1100 may provide resource pool information related to mode 2 transmission to the terminal apparatus 1150, as described above.
  • the terminal device 1150 may include a processor 1170, an antenna unit 1162, a transceiver 1164, and a memory 966.
  • the processor 1170 performs baseband-related signal processing, and may include an upper layer processor 1180 and a physical layer processor 1190.
  • the upper layer processor 1180 may process operations of the MAC layer, the RRC layer, or higher layers.
  • the physical layer processor 1190 may process operations of the PHY layer (eg, downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, and sidelink reception signal processing).
  • the processor 1170 may control overall operation of the terminal device 1150.
  • the antenna unit 1162 may include one or more physical antennas, and if it includes a plurality of antennas, may support MIMO transmission and reception.
  • the transceiver 1164 may include an RF transmitter and an RF receiver.
  • the memory 1166 may store information processed by the processor 1170, software related to the operation of the terminal device 1150, an operating system, an application, and may include components such as a buffer.
  • the processor 1170 of the terminal device 1150 may be set to implement the operation of the terminal in the embodiments described in the present invention.
  • the processor 1170 of the terminal device 1150 may receive a resource allocation mode from the base station device 1100.
  • the processor 1170 of the terminal device 1150 may receive an RRC connection reconfiguration message from the base station device 1100.
  • the processor 1170 of the terminal device 1150 issues an RRC connection reconfiguration message including both mode 1 related information and mode 2 related information. It can be received from the base station apparatus 1100.
  • the processor 1170 of the terminal device 1150 may perform CBR measurement on at least one of the mode 1 resource pool and the mode 2 resource pool based on information included in the RRC connection reconfiguration message.
  • the processor 1170 of the terminal device 1150 may compare the measured CBR value to each other. Further, as an example, the processor 1170 of the terminal device 1150 may compare the measured CBR value with a threshold value, and select a mode based on this. That is, when the terminal device 1150 supports both mode 1 and mode 2, the processor 1170 of the terminal device 1150 may determine a mode operating based on the specific conditions described above, as described above. .
  • the processor 1170 of the terminal device 1150 may report the BSR to the base station device 1100 when the terminal device 1150 operates based on the mode 1, the processor 1170 of the terminal device 1150. have. Thereafter, the processor 1170 of the terminal device 1150 may receive resource allocation information from the base station device 1100 and perform sidelink communication with another terminal device 1150 based on the resource allocation information, as described above. same.
  • the processor 1170 of the terminal device 1150 may receive resource pool information related to the mode 2 transmission from the base station device 1150 and perform the mode 2 operation using the same, as described above.
  • Exemplary methods of the present disclosure are expressed as a series of operations for clarity of description, but are not intended to limit the order in which the steps are performed, and each step may be performed simultaneously or in a different order if necessary.
  • the steps illustrated may include other steps in addition, other steps may be included in addition to the other steps, or other additional steps may be included in addition to some steps.
  • various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • Universal It can be implemented by a processor (general processor), a controller, a microcontroller, a microprocessor.
  • the scope of the present disclosure includes software or machine-executable instructions (eg, operating systems, applications, firmware, programs, etc.) that cause actions according to various embodiment methods to be executed on a device or computer, and such software or Instructions include a non-transitory computer-readable medium that is stored and executable on a device or computer.
  • software or Instructions include a non-transitory computer-readable medium that is stored and executable on a device or computer.
  • the present invention can be applied to a wireless communication system and a terminal device supporting vehicle communication.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé permettant à un terminal prenant en charge une communication V2X dans un système de communication sans fil de réaliser une communication de liaison latérale. Le procédé permettant de réaliser une communication de liaison latérale comprend les étapes consistant : à recevoir des informations d'indication de mode d'attribution de ressources en provenance d'une station de base ; à détecter qu'un paquet se produit pour un premier service ; à vérifier une configuration de porteuse attribuée et de groupe de ressources ; à sélectionner un mode d'attribution de ressources pour une transmission de paquets concernant le premier service sur la base des informations d'indication de mode d'attribution de ressources ; et à effectuer une communication de liaison latérale sur la base du mode d'attribution de ressources sélectionné.
PCT/KR2019/018221 2018-12-20 2019-12-20 Procédé et appareil de prise en charge de multiples modes dans un système de communication sans fil WO2020130715A1 (fr)

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KR1020180166386A KR20200077157A (ko) 2018-12-20 2018-12-20 무선통신 시스템에서 다중 모드를 지원하는 방법 및 장치
KR10-2018-0166386 2018-12-20

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KR20230039610A (ko) * 2020-07-16 2023-03-21 엘지전자 주식회사 전력 절약 모드를 기반으로 통신을 수행하는 방법 및 장치

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