WO2020085831A1 - Appareil et procédé de réalisation d'une communication de véhicule - Google Patents

Appareil et procédé de réalisation d'une communication de véhicule Download PDF

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Publication number
WO2020085831A1
WO2020085831A1 PCT/KR2019/014110 KR2019014110W WO2020085831A1 WO 2020085831 A1 WO2020085831 A1 WO 2020085831A1 KR 2019014110 W KR2019014110 W KR 2019014110W WO 2020085831 A1 WO2020085831 A1 WO 2020085831A1
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WIPO (PCT)
Prior art keywords
sidelink
terminal
information
radio bearer
configuration information
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PCT/KR2019/014110
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English (en)
Korean (ko)
Inventor
홍성표
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주식회사 케이티
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Priority claimed from KR1020190092446A external-priority patent/KR20200049493A/ko
Priority claimed from KR1020190133057A external-priority patent/KR102296467B1/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to EP19876374.0A priority Critical patent/EP3873128B1/fr
Priority to CN201980070591.0A priority patent/CN112930694A/zh
Priority to US17/288,899 priority patent/US11917706B2/en
Publication of WO2020085831A1 publication Critical patent/WO2020085831A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present disclosure relates to a method and apparatus for providing a V2X service in the next generation radio access technology (New RAT).
  • New RAT next generation radio access technology
  • ITU-R discloses the requirements for adopting the IMT-2020 international standard, and research is being conducted on next-generation wireless communication technologies to meet the requirements of the IMT-2020.
  • 3GPP is conducting research on LTE-Advanced Pro Rel-15 / 16 standard and NR (New Radio Access Technology) standard in parallel to satisfy the IMT-2020 requirement called 5G technology. Plans to be approved as the next generation wireless communication technology.
  • 5G technology it can be applied and used in autonomous vehicles. To this end, it is necessary to apply 5G technology to vehicle communication (Vehicle to everything), and high-speed transmission and reception are required while ensuring high reliability of increased data for autonomous driving.
  • the present embodiments can provide a method and apparatus for performing vehicle communication using next-generation wireless access technology.
  • the present embodiments can provide a technique for transmitting high reliability data through vehicle communication.
  • the present embodiments are a method for a terminal to perform vehicle communication (Vehicle to everything communication, V2X communication), a sidelink radio bearer for configuring a sidelink radio bearer on a sidelink interface used for vehicle communication Receiving the configuration information from the base station and configuring the sidelink radio bearer based on the sidelink radio bearer configuration information, and transmitting the sidelink radio bearer configuration information to another terminal targeted for vehicle communication and the sidelink radio bearer
  • the AM RLC entity linked to the maximum number of retransmissions is reached, detecting a sidelink radio link failure and detecting a sidelink radio link failure, the sidelink radio link failure detection is higher regardless of the RRC state of the terminal. It may provide a method comprising directing to a layer.
  • the present embodiments provide a side link radio bearer for configuring a side link radio bearer on a side link interface used for vehicle communication in a method for a base station to control vehicle to everything communication (V2X communication). Transmitting the configuration information to the terminal and receiving the sidelink failure information from the terminal, which occurs when the number of retransmissions of the transmitted data in the AM RLC entity configured in the terminal reaches the maximum number of retransmissions based on the sidelink radio bearer configuration information. It is possible to provide a method comprising steps.
  • the present embodiments are configured to configure a side link radio bearer for configuring a side link radio bearer on a side link interface used for vehicle communication in a terminal performing vehicle communication (Vehicle to everything communication). Based on the receiving unit receiving the information from the base station and the sidelink radio bearer configuration information, the sidelink radio bearer is configured, and when the AM RLC entity associated with the sidelink radio bearer reaches the maximum number of retransmissions, the sidelink radio link fails And a transmitter for transmitting sidelink radio bearing configuration information to another terminal targeted for vehicle communication, and when the sidelink radio link failure is detected, the controller irrespective of the RRC state of the terminal.
  • the present embodiments are configured in a side link radio bearer for configuring a side link radio bearer on a side link interface used for vehicle communication in a base station controlling vehicle to everything communication (V2X communication).
  • V2X communication vehicle to everything communication
  • FIG. 1 is a diagram briefly showing a structure of an NR wireless communication system to which the present embodiment can be applied.
  • FIG. 2 is a diagram for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • FIG. 5 exemplarily shows a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • FIG. 6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
  • FIG. 8 is a diagram for exemplarily illustrating symbol level alignment between different SCSs in a radio access technology to which the present embodiment can be applied.
  • FIG. 9 is a view for explaining the type of vehicle communication to which the present embodiment can be applied.
  • FIG. 10 is a diagram illustrating an architecture of a V2X communication system in an LTE system by way of example.
  • FIG. 11 is a diagram for describing a terminal operation according to an embodiment.
  • FIG. 12 is a view for explaining the operation of a base station according to an embodiment.
  • FIG. 13 is a view for explaining a terminal configuration according to an embodiment.
  • FIG. 14 is a diagram for explaining a configuration of a base station according to an embodiment.
  • first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the essence, order, order, or number of the component is not limited by the term.
  • temporal sequential relationships such as “after”, “after”, “after”, “before”, etc. Or, when the flow sequential relationship is described, it may also include a case where the "direct” or “direct” is not continuous unless used.
  • the wireless communication system in the present specification means a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, or a core network.
  • the embodiments disclosed below can be applied to a wireless communication system using various wireless access technologies.
  • the present embodiments are code division multiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-electron frequency division multiple access (SC-FDMA).
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA timedivision multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-electron frequency division multiple access
  • the wireless access technology may mean not only a specific access technology, but also a communication technology for each generation established by various communication consultation organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU.
  • CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • UTRA universal terrestrial radio access
  • CDMA2000 Code Division Multiple Access 2000
  • TDMA may be implemented with radio technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • OFDMA can be implemented with wireless technologies such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA).
  • IEEE 802.16m is an evolution of IEEE 802.16e, and provides backward compatibility with a system based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), adopting OFDMA in the downlink and SC- in the uplink.
  • Adopt FDMA Adopt FDMA.
  • the present embodiments may be applied to a currently disclosed or commercialized wireless access technology, or may be applied to a wireless access technology currently being developed or to be developed in the future.
  • the terminal in the present specification is a comprehensive concept that means a device including a wireless communication module that performs communication with a base station in a wireless communication system, WCDMA, LTE, NR, HSPA and IMT-2020 (5G or New Radio), etc. It should be interpreted as a concept including all of User Equipment (UE), Mobile Station (MS) in GSM, User Terminal (UT), Subscriber Station (SS), and wireless device.
  • the terminal may be a user portable device such as a smart phone depending on the type of use, and in the V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, or the like.
  • a machine type communication system it may mean an MTC terminal equipped with a communication module, an M2M terminal, a URLLC terminal, etc. to perform machine type communication.
  • the base station or cell herein refers to an end that communicates with a terminal in terms of a network, Node-B (Node-B), evolved Node-B (eNB), gNode-B (gNB), Low Power Node (LPN), Sector, site, various types of antennas, BTS (Base Transceiver System), access point, access point (e.g., transmission point, reception point, transmission / reception point), relay node (Relay Node) ), Mega cell, macro cell, micro cell, pico cell, femto cell, remote radio head (RRH), radio unit (RU), and small cell (small cell).
  • the cell may mean to include a bandwidth part (BWP) in the frequency domain.
  • the serving cell may mean the Activation BWP of the terminal.
  • the base station can be interpreted in two ways. 1) a device that provides a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell in relation to the wireless area, or 2) the wireless area itself. In 1), all devices that provide a predetermined wireless area are controlled by the same entity or interact to configure the wireless area in a collaborative manner. Points, transmission / reception points, transmission points, reception points, and the like, according to a configuration method of a wireless area, are examples of base stations. In 2), the radio area itself, which receives or transmits a signal from the viewpoint of the user terminal or the neighboring base station, may be directed to the base station.
  • a cell is a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission / reception point, or a transmission / reception point itself. You can.
  • Uplink (Uplink, UL, or uplink) means a method of transmitting and receiving data to the base station by the terminal
  • downlink Downlink (Downlink, DL, or downlink) means a method of transmitting and receiving data to the terminal by the base station do.
  • Downlink may mean a communication or communication path from a multiple transmit and receive point to a terminal
  • uplink may mean a communication or communication path from a terminal to a multiple transmit and receive point.
  • the transmitter may be a part of multiple transmission / reception points
  • the receiver may be a part of the terminal.
  • the transmitter in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.
  • the uplink and downlink transmit and receive control information through control channels such as PDCCH (Physical Downlink Control CHannel), PUCCH (Physical Uplink Control CHannel), and PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel), etc.
  • the same data channel is configured to transmit and receive data.
  • signals are transmitted / received through channels such as PUCCH, PUSCH, PDCCH and PDSCH is also described in the form of 'transmit and receive PUCCH, PUSCH, PDCCH and PDSCH'.
  • 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of ITU-R's next-generation radio access technology after research on 4G (4th-Generation) communication technology. Specifically, 3GPP develops a new NR communication technology separate from LTE-A pro and 4G communication technology, which have improved LTE-Advanced technology to meet the requirements of ITU-R as a 5G communication technology. LTE-A pro and NR both refer to 5G communication technology.
  • 5G communication technology will be described with reference to NR when a specific communication technology is not specified.
  • the operating scenario in NR has defined various operating scenarios by adding considerations for satellite, automobile, and new verticals in the existing 4G LTE scenario, and has an eMBB (Enhanced Mobile Broadband) scenario and high terminal density in terms of service It is deployed in the range and supports the Massive Machine Communication (mmmTC) scenario, which requires low data rate and asynchronous connection, and Ultra Reliability and Low Latency (URLLC) scenario, which requires high responsiveness and reliability and can support high-speed mobility.
  • Massive Machine Communication mmmTC
  • URLLC Ultra Reliability and Low Latency
  • NR discloses a wireless communication system to which a new waveform and frame structure technology, low latency technology, ultra-high-bandwidth (mmWave) support technology, and forward compatibility technology are applied.
  • mmWave ultra-high-bandwidth
  • NR forward compatibility technology
  • FIG. 1 is a diagram briefly showing the structure of an NR system to which the present embodiment can be applied.
  • the NR system is divided into 5GC (5G Core Network) and NR-RAN parts, and NG-RAN is controlled for a user plane (SDAP / PDCP / RLC / MAC / PHY) and UE (User Equipment). It consists of gNB and ng-eNBs that provide a plane (RRC) protocol termination.
  • the gNB interconnects or the gNB and ng-eNB are interconnected via an Xn interface.
  • gNB and ng-eNB are each connected to 5GC through an NG interface.
  • the 5GC may be configured to include an access and mobility management function (AMF) in charge of a control plane such as a terminal access and mobility control function and a user plane function (UPF) in charge of a control function in user data.
  • AMF access and mobility management function
  • UPF user plane function
  • the NR includes support for frequency bands below 6 GHz (FR1, Frequency Range 1) and frequency bands above 6 GHz (FR2, Frequency Range 2).
  • gNB means a base station providing NR user plane and control plane protocol termination to the terminal
  • ng-eNB means a base station providing E-UTRA user plane and control plane protocol termination to the terminal.
  • the base station described in this specification should be understood as a meaning encompassing gNB and ng-eNB, and may be used in a sense to refer to gNB or ng-eNB separately if necessary.
  • a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and CP-OFDM or DFT-s-OFDM is used for uplink transmission.
  • OFDM technology is easy to combine with multiple input multiple output (MIMO), and has the advantage of being able to use a receiver of high complexity with high frequency efficiency.
  • the NR transmission neurology is determined based on sub-carrier spacing (sub-carrier spacing) and cyclic prefix (CP), and ⁇ value is used as an exponential value of 2 based on 15khz as shown in Table 1 below. Is changed to
  • the NR numerology can be divided into 5 types according to the subcarrier spacing. This is different from that in which the subcarrier spacing of LTE, which is one of 4G communication technologies, is fixed at 15 kHz. Specifically, subcarrier intervals used for data transmission in NR are 15, 30, 60, and 120 kHz, and subcarrier intervals used for synchronization signal transmission are 15, 30, 120, and 240 kHz. In addition, the extended CP is applied only to the 60 kHz subcarrier interval.
  • a frame structure in NR is defined as a frame having a length of 10 ms, which is composed of 10 subframes having the same length of 1 ms.
  • One frame can be divided into 5 ms half frames, and each half frame includes 5 subframes.
  • one subframe is composed of one slot, and each slot is composed of 14 OFDM symbols. Therefore, it can be divided into 5 types. This is different from that in which the subcarrier spacing of LTE, which is one of 4G communication technologies, is fixed at 15khz.
  • the subcarrier interval used for data transmission in NR is 15, 30, 60, and 120 khz
  • the subcarrier interval used for synchronization signal transmission is 15, 30, 12, and 240 khz.
  • the extended CP applies only to the 60khz subcarrier spacing.
  • a frame structure in NR is defined as a frame having a length of 10 ms, which is composed of 10 subframes having the same length of 1 ms.
  • One frame can be divided into 5 ms half frames, and each half frame includes 5 subframes.
  • one subframe is composed of one slot, and each slot is composed of 14 OFDM symbols.
  • 2 is a diagram for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • a slot is fixedly composed of 14 OFDM symbols in the case of a normal CP, but the length in the time domain of the slot may vary according to the subcarrier interval.
  • the slot is 1 ms long and is configured to have the same length as the subframe.
  • a slot is composed of 14 OFDM symbols, but may have two slots in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined with a fixed time length, and the slot is defined by the number of symbols, so that the time length may vary according to the subcarrier interval.
  • the NR defines a basic unit of scheduling as a slot, and also introduces a mini-slot (or sub-slot or non-slot based schedule) to reduce transmission delay in a radio section. If a wide subcarrier interval is used, the transmission delay in a radio section can be reduced because the length of one slot is inversely shortened.
  • the mini-slot (or sub-slot) is for efficient support for URLLC scenarios and can be scheduled in units of 2, 4, and 7 symbols.
  • uplink and downlink resource allocation is defined as a symbol level within one slot.
  • a slot structure capable of directly transmitting HARQ ACK / NACK within a transmission slot has been defined, and this slot structure is referred to as a self-contained structure.
  • NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in 3GPP Rel-15.
  • a common frame structure constituting an FDD or TDD frame is supported through a combination of various slots.
  • a slot structure in which all symbols of a slot are set to downlink a slot structure in which all symbols are set to uplink
  • a slot structure in which downlink symbols and uplink symbols are combined are supported.
  • the NR supports that data transmission is scheduled in one or more slots.
  • the base station may inform the UE whether the slot is a downlink slot, an uplink slot, or a flexible slot using a slot format indicator (SFI).
  • SFI slot format indicator
  • the base station may indicate a slot format by indicating an index of a table configured through UE-specific RRC signaling using SFI, and dynamically indicate through DCI (Downlink Control Information) or static or through RRC It can also be given quasi-statically.
  • antenna ports With regard to physical resources in the NR, antenna ports, resource grids, resource elements, resource blocks, bandwidth parts, etc. are considered. do.
  • the antenna port is defined such that a channel carrying a symbol on the antenna port can be inferred from a channel carrying another symbol on the same antenna port. If the large-scale property of a channel carrying a symbol on one antenna port can be deduced from a channel carrying a symbol on another antenna port, the two antenna ports are QC / QCL (quasi co-located or quasi co-location).
  • QC / QCL quadsi co-located or quasi co-location.
  • a wide range of characteristics includes one or more of Delay spread, Doppler spread, Frequency shift, Average received power and Received Timing.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.
  • a resource grid may exist according to each neuromerging because the NR supports a plurality of neuromerging on the same carrier.
  • the resource grid may exist according to the antenna port, subcarrier spacing, and transmission direction.
  • a resource block consists of 12 subcarriers and is defined only on the frequency domain. Further, a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as shown in FIG. 3, the size of one resource block may vary according to the subcarrier interval.
  • "Point A" serving as a common reference point for a resource block grid, a common resource block, and a virtual resource block are defined.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • a terminal may be used by designating a bandwidth part (BWP) within a carrier bandwidth.
  • BWP bandwidth part
  • the bandwidth part is associated with one neurology and is composed of a subset of consecutive common resource blocks, and can be dynamically activated with time.
  • a maximum of 4 bandwidth parts are configured in the uplink and downlink, respectively, and data is transmitted and received using the bandwidth part activated at a given time.
  • the uplink and downlink bandwidth parts are independently set, and in the case of an unpaired spectrum, unnecessary frequency re-tunning is prevented between downlink and uplink operation.
  • the bandwidth part of the downlink and the uplink is set in pairs so that the center frequency can be shared.
  • a terminal accesses a base station and performs cell search and random access procedures to perform communication.
  • Cell search is a procedure in which a terminal synchronizes with a cell of a corresponding base station, acquires a physical layer cell ID, and acquires system information using a synchronization signal block (SSB) transmitted by the base station.
  • SSB synchronization signal block
  • FIG. 5 exemplarily shows a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • the SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) occupying 1 symbol and 127 subcarriers, and 3 OFDM symbols and a PBCH spanning 240 subcarriers, respectively.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the terminal receives the SSB by monitoring the SSB in the time and frequency domain.
  • SSB can be transmitted up to 64 times in 5 ms. Multiple SSBs are transmitted in different transmission beams within a 5 ms time period, and the UE performs detection by assuming that SSBs are transmitted every 20 ms period based on a specific one beam used for transmission.
  • the number of beams that can be used for SSB transmission within 5 ms time may increase as the frequency band increases. For example, up to four SSB beams can be transmitted below 3 GHz, and up to eight different beams can be transmitted using up to eight different beams in the frequency band from 3 to 6 GHz and up to 64 in the frequency band above 6 GHz.
  • Two SSBs are included in one slot, and the starting symbol and the number of repetitions in the slot are determined according to the subcarrier interval.
  • the SSB is not transmitted at the center frequency of the carrier bandwidth, unlike the SS of the conventional LTE. That is, the SSB may be transmitted out of the center of the system band, and in the case of supporting broadband operation, a plurality of SSBs may be transmitted on the frequency domain. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency location for monitoring the SSB.
  • the carrier raster and synchronization raster which are the center frequency location information of the channel for initial access, are newly defined in NR, and the synchronization raster has a wider frequency interval than the carrier raster, and thus supports fast SSB search of the UE. You can.
  • the UE may acquire MIB through the PBCH of the SSB.
  • the MIB Master Information Block
  • the MIB includes minimum information for the UE to receive the remaining system information (RMSI, Remaining Minimum System Information) broadcast by the network.
  • RMSI Remaining Minimum System Information
  • PBCH is information on the location of the first DM-RS symbol on the time domain, information for the UE to monitor SIB1 (for example, SIB1 neuromerging information, information related to SIB1 CORESET, search space information, PDCCH Related parameter information, etc.), offset information between the common resource block and the SSB (the position of the absolute SSB in the carrier is transmitted through SIB1), and the like.
  • the SIB1 pneumatic information is equally applied to some messages used in the random access procedure for accessing the base station after the terminal completes the cell search procedure.
  • pneumatic information of SIB1 may be applied to at least one of messages 1 to 4 for a random access procedure.
  • the aforementioned RMSI may mean System Information Block 1 (SIB1), and SIB1 is broadcast periodically (ex, 160 ms) in a cell.
  • SIB1 includes information necessary for the UE to perform the initial random access procedure, and is periodically transmitted through the PDSCH.
  • the UE In order to receive the SIB1, the UE needs to receive pneumatic information used for SIB1 transmission and control resource set (CORESET) information used for scheduling of SIB1 through the PBCH.
  • CORESET control resource set
  • the UE identifies scheduling information for SIB1 using SI-RNTI in CORESET, and acquires SIB1 on the PDSCH according to the scheduling information.
  • SIBs other than SIB1 may be periodically transmitted or may be transmitted according to a terminal's request.
  • FIG. 6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
  • the UE transmits a random access preamble for random access to the base station.
  • the random access preamble is transmitted through PRACH.
  • the random access preamble is transmitted to the base station through PRACH composed of continuous radio resources in a specific slot that is periodically repeated.
  • a contention-based random access procedure is performed when the UE initially accesses a cell
  • a non-competition-based random access procedure is performed when random access is performed for beam failure recovery (BFR).
  • BFR beam failure recovery
  • the terminal receives a random access response to the transmitted random access preamble.
  • the random access response may include a random access preamble identifier (ID), UL grant (uplink radio resource), temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier) and TAC (Time Alignment Command). Since one random access response may include random access response information for one or more terminals, a random access preamble identifier may be included to inform which terminal the included UL Grant, temporary C-RNTI, and TAC are valid.
  • the random access preamble identifier may be an identifier for the random access preamble received by the base station.
  • the TAC may be included as information for the UE to adjust uplink synchronization.
  • the random access response may be indicated by a random access identifier on the PDCCH, that is, a Random Access-Radio Network Temporary Identifier (RA-RNTI).
  • RA-RNTI Random Access-Radio Network Temporary Identifier
  • the terminal Upon receiving a valid random access response, the terminal processes the information included in the random access response and performs scheduled transmission to the base station. For example, the terminal applies TAC and stores a temporary C-RNTI. In addition, by using UL Grant, data stored in the buffer of the terminal or newly generated data is transmitted to the base station. In this case, information capable of identifying the terminal should be included.
  • the terminal receives a downlink message for contention resolution.
  • the downlink control channel in the NR is transmitted in a control resource set (CORESET) having a length of 1 to 3 symbols, and transmits uplink / downlink scheduling information, slot format index (SFI), and transmit power control (TPC) information.
  • CORESET control resource set
  • SFI slot format index
  • TPC transmit power control
  • CORESET Control Resource Set
  • the UE may decode the control channel candidate using one or more search spaces in the CORESET time-frequency resource.
  • QCL Quad CoLocation
  • CORESET may exist in various forms within a carrier bandwidth within one slot, and CORESET may consist of up to 3 OFDM symbols in a time domain.
  • CORESET is defined as a multiple of 6 resource blocks from the frequency domain to the carrier bandwidth.
  • the first CORESET is indicated through the MIB as part of the initial bandwidth part configuration to receive additional configuration information and system information from the network.
  • the UE may configure by receiving one or more CORESET information through RRC signaling.
  • frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals or various messages related to NR (New Radio) can be interpreted as meaning used in the past or present or various meanings used in the future.
  • the NR recently conducted in 3GPP has been designed to satisfy various QoS requirements required for each segmented and specific usage scenario as well as an improved data rate compared to LTE.
  • enhancement mobile BroadBand eMBB
  • massive MTC massive MTC
  • URLLC Ultra Reliable and Low Latency Communications
  • Each usage scenario has different requirements for data rates, latency, reliability, and coverage.
  • radio resource units based on different numerology (eg subcarrier spacing, subframe, TTI, etc.) ( It is designed to multiplex units efficiently.
  • NR defines a subframe as a type of time domain structure.
  • SCS Sub-Carrier Spacing
  • the subframe of NR is an absolute reference time duration, and slots and mini-slots may be defined as time units based on actual uplink / downlink data scheduling.
  • an arbitrary slot is composed of 14 symbols.
  • all symbols may be used for DL transmission, or all symbols may be used for UL transmission, or may be used in the form of DL portion + (gap) + UL portion depending on the transmission direction of the corresponding slot. have.
  • a mini-slot is defined consisting of fewer symbols than the aforementioned slots.
  • a short-length time-domain scheduling interval for transmitting / receiving mini-slot-based uplink / downlink data may be set, or a long length time-domain scheduling interval for transmitting / receiving uplink / downlink data through slot aggregation may be configured. have.
  • FIG. 8 is a diagram for exemplarily illustrating symbol level alignment between different SCSs in a radio access technology to which the present embodiment can be applied.
  • numerology having different SCS values in one NR carrier may be multiplexed and supported by TDM and / or FDM. Accordingly, a method of scheduling data according to latency requirements based on a slot (or mini-slot) length defined for each numerology is also considered. For example, when the SCS is 60 kHz, the length of the symbol is reduced by about 1/4 compared to the case of the SCS 15 kHz, so if one slot is composed of 14 OFDM symbols, the corresponding 15 kHz based slot length is 1 ms. On the other hand, the slot length based on 60 kHz is reduced to about 0.25 ms.
  • FIG. 9 is a view for explaining the type of vehicle communication to which the present embodiment can be applied.
  • a vehicle can be connected to the Internet and other vehicles by providing the vehicle with access to a mobile communication network (eg, LTE or LTE-Advanced).
  • a mobile communication network eg, LTE or LTE-Advanced.
  • V2X (Vehicle to Everything) communication includes the following four types.
  • Vehicle to vehicle communication Vehicle to vehicle communication
  • FIG. 10 is a diagram illustrating an architecture of a V2X communication system in an LTE system by way of example.
  • V2X service may be provided through a PC5 interface and / or a Uu interface. Support through the PC5 interface was provided through V2X sidelink communication.
  • V2X communication terminals (UE A to D) are connected to the PC5 interface, and the V2X communication terminal and the V2X control function are connected to the V3 interface.
  • the V2X application server and the V2X application of each V2X communication terminal are linked with a V1 interface.
  • the V2X communication terminal is connected to the base station (E-UTRAN) through the Uu interface, and the base station is connected to the core network (MME and S / P GW) and the S1 interface.
  • MME and S / P GW are linked to HSS and S6a interface, and HSS is linked to V2X control function and V4 interface.
  • Core network entity is linked with V2X application server and SGi interface.
  • the V2X applications of each V2X communication terminal are linked to each other through a V5 interface.
  • the user plane details of the conventional sidelink communication are as follows.
  • RLC UM is used for sidelink communication
  • the receiving terminal needs to maintain at least one RLC UM entity per peered transmitting terminal (A receiving UE needs to maintain at least one RLC UM entity per transmitting peer UE)
  • -ROHC Unidirectional Mode is used for header compression in PDCP for sidelink communication (PDHC for sidelink communication)
  • sidelink transmission and reception for providing V2X service was performed based on broadcast.
  • the transmitting and receiving terminal did not need to establish a logical connection.
  • Sidelink communication only supported RLC UM mode, which is useful for delay-sensitive services.
  • the receiving terminal Before the receiving terminal receives the first RLC UM PDU, the receiving RLC UM entity need not be configured. The receiving terminal needed to maintain at least one RLC UM entity per transmitting terminal, and was able to set the receiving RLC UM entity and process the received data by receiving the first RLC UM PDU.
  • NR V2X intends to support both sidelink unicast, sidelink groupcast, and sidelink broadcast methods.
  • RLC AM Acknowledged Mode
  • a specific method for sidelink communication supporting RLC AM has not been disclosed.
  • the present disclosure intends to provide a high reliability sidelink communication technology based on RLC AM.
  • a specific method for solving a problem that a service may be stopped is proposed.
  • each embodiment described below may be applied to an NR terminal through an NR base station.
  • each embodiment may be applied to an LTE terminal through an LTE base station, or may be applied to an LTE terminal connecting to an eLTE base station connected through a 5G system (or 5G Core Network).
  • each embodiment may be applied to an E-UTRAN NR Dual Connectivity (EN-DC) terminal or a NE-DC terminal that simultaneously provides LTE and NR radio connections.
  • EN-DC E-UTRAN NR Dual Connectivity
  • V2X communication may be described as side link communication or vehicle communication.
  • the name of each information in the present specification is exemplary, and the information may be changed to various names by definitions of transmitting and receiving subjects and detailed data included in the information.
  • the terminal state may be divided into an RRC connection, an RRC idle state, and an RRC Inactive state.
  • the RRC inactive state may be described as an RRC inactive state, and it is recognized that the corresponding terminal is in the RRC connection state between the core network and the base station, and means that the RRC connection is released between the base station and the terminal. That is, for the UE in the RRC inactive state, both the associated SRB and DRB are released, and the UE context is stored.
  • the UE in the RRC inactive state may have a state transition to the RRC connected state, and for this, performs an RRC resume procedure.
  • sidelink transmission and reception for providing V2X service was made based on broadcast. That is, a sidelink radio channel or radio signal is broadcast without specifying a receiving terminal at any transmitting terminal. Sidelink communication was performed by receiving the broadcasting signals at the neighboring terminals.
  • a unicast method or a groupcast method needs to be supported.
  • a unicast or groupcast link between one transmitting terminal and corresponding receiving terminal (s), or one master terminal and corresponding slave terminal (s) is configured.
  • the PSSCH transmission resource through the configured link may also be scheduled by the base station or selected by the transmitting terminal, as described above.
  • V2X communication can be performed using RLC AM providing lossless transmission.
  • V2X communication can be equally applied to V2X communication in a groupcast / multicast method as well as a unicast method.
  • the present disclosure can be equally applied to any D2D communication provided in a unicast manner through a PC5 interface.
  • the present disclosure may be applied to a device supporting PC5 sidelink communication for Proximity-based services (ProSe) disclosed in 3GPP TS23.303 based on NR.
  • ProSe Proximity-based services
  • the radio bearer configured on the sidelink interface is described as a sidelink radio bearer
  • RLC configuration information including RLC entity configuration information for the sidelink interface is described as sidelink RLC configuration information.
  • sidelink RLC configuration information is used in the same sense when not specifically used to distinguish them.
  • sidelink RLC configuration information and RLC configuration information are also used in the same sense.
  • FIG. 11 is a diagram for describing a terminal operation according to an embodiment.
  • a terminal performing vehicle communication receives sidelink radio bearing configuration information from a base station for configuring a side link radio bearing on a side link interface used for vehicle communication. It may be performed (S1100).
  • the terminal performs vehicle communication through a side link interface. Therefore, the terminal needs to configure the sidelink radio bearer on the sidelink interface. To this end, the terminal receives the sidelink radio bearer configuration information for the sidelink from the base station.
  • the sidelink radio bearer configuration information may include RLC bearer configuration information.
  • the RLC bearer configuration information may include parameters necessary to configure the AM RLC entity for the sidelink.
  • RLC bearer configuration information may include uplink AM RLC configuration information and downlink AM RLC configuration information.
  • the uplink refers to a link for transmitting data from the perspective of the transmitting terminal to another terminal
  • the downlink refers to a link for receiving data from the other terminal from the perspective of the transmitting terminal.
  • the sidelink radio bearer configuration information may include information for bidirectional AM RLC configuration.
  • the RLC bearer configuration information may include information for bidirectional AM RLC configuration.
  • the terminal may perform a step of configuring a sidelink radio bearer using a sidelink interface based on the sidelink radio bearer configuration information, and transmitting the sidelink radio bearer configuration information to another terminal targeted for vehicle communication ( S1110).
  • the terminal may inform the other terminal of the sidelink radio bearer parameters related to sidelink transmission and reception by instructing the sidelink radio bearer configuration information.
  • the terminal may configure the sidelink radio bearer based on the sidelink radio bearer configuration information before transmitting the sidelink radio bearer configuration information to another terminal.
  • the terminal may configure the sidelink radio bearer based on the sidelink radio bearer configuration information after transmitting the sidelink radio bearer configuration information to another terminal.
  • the terminal configures the AM RLC entity for the sidelink to the terminal using the sidelink radio bearer configuration information.
  • the terminal may set a sidelink radio bearer configured on the sidelink interface for vehicle communication and link it to the configured AM RLC entity.
  • One or more sidelink radio bearers may be configured, or may be configured for each V2X service.
  • the terminal may transmit and receive data to and from another vehicle communication terminal on the sidelink interface using the configured sidelink radio bearing.
  • data may be transmitted and received in a unicast manner, but may also be transmitted and received in a groupcast or broadcast manner.
  • the terminal monitors the number of retransmissions of data transmitted through the sidelink radio bearer by the AM RLC entity linked to the sidelink radio bearer, and when the AM RLC entity associated with the sidelink radio bearer reaches the maximum number of retransmissions, the sidelink A step of detecting a radio link failure may be performed (S1120).
  • the terminal receives an acknowledgment message for the transmitted data from another terminal. If an acknowledgment message (ex, ACK message) for specific transmission data is not received, the AM RLC entity of the terminal performs a retransmission operation. Therefore, the ARQ process has not been applied to a vehicle communication based on a conventional LTE system, but the ARQ process operation for securing high reliability is applied to the vehicle communication of the present disclosure.
  • the AM RLC entity of the terminal monitors the number of retransmissions of transmission data transmitted through the sidelink radio bearer. This is because it is necessary to consider radio link failure when transmission data is continuously retransmitted and the number of retransmissions for a specific transmission data is indicated by the base station or reaches a preset maximum number of retransmissions.
  • the AM RLC entity of the terminal monitors and determines whether the number of retransmissions of the specific transmission data has been indicated by the base station or has reached the preset maximum number of retransmissions.
  • the terminal When the terminal detects a sidelink radio link failure because the number of retransmissions reaches the maximum number of retransmissions, the terminal may perform a step of instructing the detection of the sidelink radio link failure to the upper layer regardless of the RRC state (S1130).
  • the terminal recognizes that a problem has occurred in the corresponding sidelink when the number of retransmissions for a specific transmission data in the AM RLC entity reaches the maximum number of retransmissions indicated by the base station or preset. For example, the terminal may detect a radio link failure of the sidelink through which transmission data is transmitted. In this case, the terminal needs to request scheduling of a new sidelink radio resource to the base station when the base station allocates the sidelink radio resource. Or, the base station needs to be aware of the radio link failure of the sidelink for any reason.
  • the terminal may indicate this to the upper layer regardless of the RRC state of the terminal.
  • the terminal may transmit information for indicating a sidelink radio link failure to the base station.
  • information for indicating a sidelink radio link failure is described as sidelink failure information, and the term is not limited.
  • the sidelink failure information includes at least one of serving cell identification information, serving cell measurement result information, sidelink carrier identification information, time stamp information, terminal location information, V2X session identification information, and destination L2 ID information. can do.
  • the base station checks specific cell, carrier, time, location or session information related to the radio link failure situation of the sidelink reported by the terminal. If necessary, the base station may allocate new sidelink radio resources to the terminal.
  • the sidelink failure information may include sidelink RRC failure type information when the terminal is in the RRC connection state.
  • the terminal in the RRC connection state can also transmit and receive data with the base station. Therefore, when the terminal transmits radio link failure information to the base station, the base station may have difficulty in distinguishing whether the radio link failure is a radio link failure with the base station or a radio link failure for another carrier in a dual connectivity or CA situation. .
  • the terminal uses an RRC message distinguished from the RRC failure information message to distinguish sidelink failure information, or includes RRC failure type information for distinguishing sidelink failure information, sidelink ( Or, it may indicate that the sidelink radio link has failed due to the excessive number of retransmissions in a specific radio bearer.
  • the terminal may perform vehicle communication even in an RRC state other than the RRC connection state. That is, since vehicle communication directly transmits and receives data between a transmitting terminal and a receiving terminal regardless of a connection state with a base station, an RRC IDLE state or an RRC Inactive state terminal can also be performed.
  • the sidelink failure information may be transmitted to the base station through the RRC connection establishment procedure of the terminal when the terminal is in the RRC idle state or the RRC inactive state.
  • sidelink failure information may be transmitted to the base station in the process of establishing the RRC connection with the base station or after the RRC connection is established. If sidelink failure information is transmitted in the RRC connection establishment process, it may be included in an RRC setup request message, an RRC setup completion message, etc. transmitted by the terminal to the base station.
  • sidelink failure information may be transmitted to the base station in the process of resuming the RRC connection for the terminal to transition to the RRC connection state or after the RRC connection is established. If sidelink failure information is transmitted in the RRC connection establishment process, it may be included in an RRC resume request message, an RRC resume complete message, etc. transmitted by the terminal to the base station.
  • the sidelink identifier selected according to the configuration of the sidelink radio bearer may include at least one of sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier.
  • the sidelink identifier can be selected by the terminal or another terminal.
  • the terminal may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • other terminals may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • the side link identifier selected by the terminal or another terminal must be shared between the terminal and the other terminal, and must be recognized in the same sense. Therefore, the terminal and the other terminal can share the sidelink identifier.
  • the terminal when the terminal selects the sidelink identifier, the other terminal may have already allocated the identifier for other purposes or for sidelink communication with another third terminal. Therefore, a processing procedure is required in this case.
  • the other terminal may transmit failure information to the base station or the selected terminal.
  • the sidelink radio bearer configuration information may be received in a different procedure according to the RRC state of the terminal.
  • sidelink radio bearer configuration information may be received according to a sidelink radio bearer request signal including QoS parameters of a V2X sidelink session that the UE transmits to the base station.
  • the terminal transmits a sidelink radio bearer request signal to the base station.
  • the sidelink radio bearer request signal includes QoS parameters of the V2X sidelink session.
  • the base station may transmit the sidelink radio bearer configuration information to the terminal based on the sidelink radio bearer request signal. If necessary, sidelink radio bearer configuration information may be generated in association with QoS parameters of a V2X sidelink session.
  • sidelink radio bearer configuration information may be received through system information. That is, the base station may broadcast the system information by including sidelink radio bearer configuration information.
  • the terminal can perform AM RLC entity-based sidelink data transmission / reception operation without ambiguity, thereby supporting vehicle communication based on high reliability.
  • FIG. 12 is a view for explaining the operation of a base station according to an embodiment.
  • a base station controlling vehicle communication transmits configuration information of a sidelink radio bearer for configuring a sidelink radio bearer on a sidelink interface used for vehicle communication to a terminal. It may be performed (S1200).
  • the terminal performs vehicle communication through a side link interface. Therefore, the terminal needs to configure a side link radio bearer for performing vehicle communication.
  • the base station transmits sidelink radio bearer configuration information to the terminal.
  • the sidelink radio bearer configuration information may include RLC bearer configuration information.
  • the RLC bearer configuration information may include parameters necessary for the UE to configure the AM RLC entity for the sidelink.
  • RLC bearer configuration information may include uplink AM RLC configuration information and downlink AM RLC configuration information. That is, the sidelink radio bearer configuration information may include RLC bearer configuration information including information for bidirectional AM RLC configuration.
  • the terminal transmits the sidelink radio bearer configuration information to another terminal targeted for vehicle communication.
  • the terminal may inform the other terminal of the sidelink radio bearer parameters related to sidelink transmission and reception by instructing the sidelink radio bearer configuration information.
  • the sidelink identifier selected according to the sidelink radio bearer configuration is side It may include at least one of link radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier.
  • the sidelink identifier can be selected by the terminal or another terminal.
  • the terminal may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • other terminals may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • the side link identifier selected by the terminal or another terminal must be shared between the terminal and the other terminal, and must be recognized in the same sense. Therefore, the terminal and the other terminal can share the sidelink identifier.
  • the terminal when the terminal selects the sidelink identifier, the other terminal may have already allocated the identifier for other purposes or for sidelink communication with another third terminal. Therefore, a processing procedure is required in this case.
  • the other terminal may transmit failure information to the base station or the selected terminal.
  • the terminal configures the AM RLC entity for the sidelink to the terminal by using the sidelink radio bearer configuration information.
  • the terminal may set a sidelink radio bearer for vehicle communication and link it to the configured sidelink AM RLC entity.
  • One or more sidelink radio bearers may be configured, or may be configured for each V2X service.
  • the sidelink radio bearer configuration information may be transmitted through a different procedure according to the RRC state of the terminal.
  • the sidelink radio bearer configuration information may be transmitted according to a sidelink radio bearer request signal including QoS parameters of a V2X sidelink session that the UE transmits to the base station.
  • the base station receives the sidelink radio bearer request signal from the terminal.
  • the sidelink radio bearer request signal includes QoS parameters of the V2X sidelink session.
  • the base station may transmit the sidelink radio bearer configuration information to the terminal based on the sidelink radio bearer request signal. If necessary, sidelink radio bearer configuration information may be generated in association with QoS parameters of a V2X sidelink session.
  • sidelink radio bearer configuration information may be transmitted through system information. That is, the base station may broadcast the system information by including sidelink radio bearer configuration information.
  • the base station may perform a step of receiving sidelink failure information from the terminal, which is generated when the number of retransmissions of transmission data in the AM RLC entity configured in the terminal reaches the maximum number of retransmissions based on the sidelink radio bearer configuration information ( S1210).
  • the terminal configures the sidelink radio bearer based on the sidelink radio bearer configuration information, and the number of retransmissions of data transmitted through the sidelink radio bearer in the AM RLC entity linked to the sidelink radio bearer reaches the maximum number of retransmissions. Can detect.
  • the terminal When the number of retransmissions for a specific transmission data in the AM RLC entity of the terminal is indicated by the base station or reaches a preset maximum retransmission number, the terminal recognizes that a problem has occurred in the corresponding sidelink. For example, the terminal may detect a radio link failure of the sidelink through which transmission data is transmitted. In this case, the base station needs to allocate a new radio resource to the terminal for the sidelink radio resource where the radio link failure is detected. Or, the base station needs to be aware of the radio link failure of the sidelink for any reason.
  • the base station receives sidelink failure information when the number of retransmissions for specific transmission data in the AM RLC entity of the terminal reaches the maximum number of retransmissions indicated by the base station or preset.
  • the sidelink failure information includes at least one of serving cell identification information, serving cell measurement result information, sidelink carrier identification information, time stamp information, terminal location information, destination L2 ID information, and V2X session identification information. can do.
  • the base station checks specific cell, carrier, time, location or session information related to the radio link failure situation of the sidelink reported by the terminal. If necessary, the base station may allocate new sidelink radio resources to the terminal.
  • the sidelink failure information may include sidelink RRC failure type information when the terminal is in the RRC connection state.
  • the terminal in the RRC connection state can also transmit and receive data with the base station. Therefore, when the terminal transmits radio link failure information to the base station, the base station may have difficulty in distinguishing whether the radio link failure is a radio link failure with the base station or a radio link failure for another carrier in a dual connectivity or CA situation. . Accordingly, when the terminal is in the RRC connection state, the terminal uses an RRC message distinct from the RRC failure information message to distinguish sidelink failure information or transmits the RRC failure type information that distinguishes sidelink failure information.
  • the base station may obtain information on the type of failure by receiving sidelink failure information including RRC failure type information indicating that the sidelink has failed due to an excessive number of retransmissions in the sidelink (or a specific radio bearer).
  • the terminal may perform vehicle communication even in an RRC state other than the RRC connection state. That is, since vehicle communication directly transmits and receives data between a transmitting terminal and a receiving terminal regardless of a connection state with a base station, an RRC IDLE state or an RRC Inactive state terminal can also be performed.
  • the base station needs to receive sidelink failure information in order to recognize the situation.
  • sidelink failure information may be received by the base station through the RRC connection establishment procedure of the terminal when the terminal is in the RRC idle state or the RRC inactive state.
  • sidelink failure information may be received by the terminal in the process of establishing an RRC connection with the base station or after the RRC connection is established. If sidelink failure information is received in the RRC connection establishment process, the base station may receive the RRC setup request message, the RRC setup completion message, and the like.
  • sidelink failure information may be received at the base station in the process of resuming the RRC connection for the terminal to transition to the RRC connection state or after the RRC connection is established. If sidelink failure information is transmitted in the RRC connection establishment process, the base station may receive the RRC resume request message, the RRC resume completion message, and the like.
  • the terminal can perform AM RLC entity-based sidelink data transmission / reception operation without ambiguity, thereby supporting vehicle communication based on high reliability.
  • the sidelink AM RLC entity below may mean an AM RLC configured to perform vehicle communication using the above-described sidelink interface.
  • the sidelink AM RLC configuration information may mean the above-described RLC bearer configuration information, and may be included in the above-described sidelink radio bearer configuration information.
  • the sidelink AM RLC configuration information can be described in the same meaning as the above-described sidelink radio bearer configuration information.
  • sidelink AM RLC configuration information for configuring the sidelink AM RLC entity may be configured in the terminal before performing vehicle communication.
  • a terminal capable of V2X communication may configure an AM RLC entity providing an RLC AM function through a PC5 sidelink interface.
  • AM RLC entity configuration information for the configuration of the AM RLC entity may be pre-configured in the terminal.
  • the sidelink AM RLC entity configuration information may include uplink AM RLC configuration information (ul-AM-RLC) and downlink AM RLC configuration information (dl-AM-RLC).
  • the uplink AM RLC configuration information may include one or more information elements of sn-FieldLength, t-PollRetransmit, pollPDU, pollByte, and maxRetxThreshold.
  • the downlink AM RLC configuration information may include one or more information elements of sn-FieldLength, t-Reassembly and t-StatusProhibit. As described above, the sidelink AM RLC configuration information may be included in the sidelink radio bearer configuration information. In addition, sidelink AM RLC configuration information may be included in sidelink RLC bearer configuration information of the sidelink radio bearer configuration information.
  • the transmitting / receiving terminal performing vehicle communication preconfigures the sidelink AM RLC configuration information before vehicle communication through the sidelink by transmitting the uplink AM RLC configuration information as the transmission AM RLC information and the downlink AM RLC configuration information as the reception AM RLC information. can do.
  • the default value for each of the above-described information elements may be pre-configured in the terminal.
  • the maximum retransmission threshold may be pre-configured in the terminal.
  • Both the transmitting terminal and the receiving terminal may be configured in advance with uplink AM RLC configuration information and downlink AM RLC configuration information.
  • the transmitting terminal and the receiving terminal may configure the sidelink AM RLC entity in advance using the sidelink AM RLC configuration information.
  • the sidelink AM RLC parameter between the transmitting and receiving terminals may be configured with the same value between the transmitting terminal and the receiving terminal. Through this, it is possible to perform matching processing between the transmitting terminal and the receiving terminal.
  • the maximum retransmission threshold value (maxRetxThreshold) included in the transmission AM RLC configuration information of the transmitting terminal and the maximum retransmission threshold value (maxRetxThreshold) included in the transmission AM RLC configuration information of the receiving terminal may be configured with the same value. .
  • the sequence number length (sn-FieldLength) included in the transmission AM RLC configuration information of the transmitting terminal is configured with the same value as the sequence number length (sn-FieldLength) included in the reception AM RLC configuration information of the receiving terminal. Can be.
  • the sidelink AM RLC configuration information for configuring the sidelink AM RLC entity is composed of a plurality of sets having values with different detailed parameters, and each AM RLC configuration information is indexed. It can be divided and configured in the terminal.
  • the sidelink AM RLC configuration information may be pre-configured in the terminal by differently setting a value that the detailed information element can have for each detailed information element according to an operator policy.
  • the index can be managed by linking each sidelink AM RLC configuration information having different detail element values.
  • index information of the sidelink AM RLC configuration information may be first transmitted when initiating a unicast V2X communication (for example, when setting a sidelink radio bearer) to use the RLC AM function.
  • index information of AM RLC configuration information may be transmitted between the transmitting terminal and the receiving terminal.
  • index information of sidelink AM RLC configuration information may be transmitted between a transmitting terminal and a receiving terminal during setting of a sidelink radio bearer through an RRC message.
  • Sidelink AM RLC configuration information may be pre-configured in connection with parameters related to vehicle communication.
  • sidelink AM RLC configuration information linked to at least one of the following parameters may be preconfigured in the terminal.
  • One or more sidelink radio bearers may be configured in one source L2 ID and one destination L2 ID. Within one source L2 ID and one destination L2 ID, one sidelink radio bearer can be identified through a sidelink radio bearer identifier for identifying it.
  • the sidelink radio bearer may include RLC bearer configuration information like the NR Uu radio bearer.
  • the RLC bearer configuration information of NR Uu includes a logical channel identifier, a radio bearer identifier, RLC configuration information, and logical channel configuration information.
  • the source / destination L2 ID indicates information included in the MAC header. For example, one part of the entire source / destination ID is used as the L1 source / destination ID in Sidelink Control Information (SCI), and the other part is carried as the source / destination L2 ID in the MAC header.
  • SCI Sidelink Control Information
  • the source / destination L2 ID is used to identify the source / destination of the corresponding L2 frame on the PC5 interface.
  • the source L2 ID is always assigned by the terminal generating the corresponding L2 frame.
  • the default destination L2 ID associated with the V2X service type may be used.
  • the L2 IDs are exchanged.
  • the source / destination L2 ID is used for the subsequent communication between the two terminals.
  • V2X service represents a service provided by a V2X application and a V2X application server.
  • the V2X service may be classified into different V2X service types with a provider service identifier (PSID) identifier provided by a service provider or an ITS application identifier (ITS-AID) identifier.
  • PSID provider service identifier
  • ITS-AID ITS application identifier
  • the V2X application layer identifier is associated with one or more V2X applications in the terminal. Since the V2X application layer does not use the L2 ID, the terminal maintains mapping information between the application layer ID and the source L2 ID used for the PC5 unicast link. For example, the V2X application layer identifier can be used as an identifier (ex, station ID, vehicle ID, etc.) to identify a specific object such as a vehicle, pedestrian, or road side unit (RSU) within the context of a specific V2X application. have.
  • PC5 QoS information is provided for PC5 unicast communication from the V2X application layer, and indicates PC5 QoS parameters for V2X services.
  • PQI is a special 5QI and represents a parameter for controlling QoS forwarding treatment for packets transmitted through the PC5 reference point.
  • PC5 Aggregated Bit Rates represents the aggregate maximum bit rate for PC5 links.
  • a flow-based QoS model can be used similar to NR Uu.
  • the UE derives PC5 QoS parameters based on the V2X application layer and V2X application requirements provided by the V2X service type.
  • the UE allocates a PC5 QoS Flow Identifier (PFI) to this PC5 QoS flow.
  • PFI PC5 QoS Flow Identifier
  • the PC5 QoS rule includes an IP packet filter set or a V2X packet filter set.
  • the V2X packet filter set may be supported based on a combination of V2X service type, source / destination L2 ID, application layer ID, and extended parameters.
  • the P5 PC5 QoS Flow Identifier
  • the radio bearer or sidelink RLC bearer or sidelink logical channel identifier may be configured in connection with one or more of V2X service type, source L2 ID, destination L2 ID, application layer ID, 5QI (PQI) and PC5 5G QoS parameters.
  • sidelink radio bearer identification information or sidelink RLC bearer identification information or sidelink logical channel identifier must be matched on the transmitting terminal and the receiving terminal.
  • the side link corresponding to the transmitting / receiving terminal so that the transmitting / receiving terminal transmits and receives data by arranging at least one of the sidelink radio bearer parameter (identification information), the sidelink RLC bearer parameter (identification information), and the sidelink logical channel parameter (identifier).
  • the above parameters for identifying the radio configuration must be consistent.
  • sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifiers are denoted as sidelink identifiers below.
  • the above-described sidelink identifier information should be matched on the transmitting terminal and the receiving terminal.
  • the sidelink identifier information included in the transmitting terminal for configuring the sidelink radio bearer is not allowed in the receiving terminal.
  • the above-described terminal may be described by describing another terminal as a transmitting terminal and a receiving terminal.
  • the transmitting terminal transmits sidelink radio bearer configuration information including sidelink identifier information set information available on the RRC message for configuring the sidelink radio bearer at the transmitting terminal to the receiving terminal.
  • the sidelink identifier information may be information selected by the transmitting terminal or selected by the base station.
  • the receiving terminal may select applicable sidelink identifier information from among the received sets, and may transmit an RRC confirmation message including the selected sidelink identifier information to the transmitting terminal.
  • the receiving terminal may select any sidelink identifier information from the set of available sidelink identifier information, or may select identifier information having the smallest value.
  • the transmitting terminal transmits the sidelink radio bearing configuration information including side link identifier information selected by the transmitting terminal among the set of side link identifier information available on the RRC message for configuring the side link radio bearing in the transmitting terminal. If the sidelink identifier information selected by the transmitting terminal is applicable, the receiving terminal may transmit an RRC confirmation message for this. If the sidelink identifier information selected by the transmitting terminal at the receiving terminal is already occupied and is not applicable, the RRC failure / response message for this may include the sidelink identifier information set information available at the receiving terminal and transmit it to the transmitting terminal. have. Alternatively, in the case of a connected terminal, an RRC failure / response message may be transmitted to the base station.
  • the receiving terminal may transmit an RRC failure / response message to the base station.
  • the receiving terminal transmits an RRC failure / response message to the transmitting terminal, and the transmitting terminal may transmit it to the base station.
  • the sidelink identifier can be applied through negotiation with the reception terminal.
  • the opposite terminal can check and apply the sidelink identifier.
  • the receiving terminal or the other terminal can transmit the indication information to the transmitting terminal or the base station.
  • the receiving terminal when a transmitting terminal initiating unicast sidelink communication has set a sidelink wireless bearing or a transmitting terminal transmits it to a receiving terminal, the receiving terminal knows this, but the receiving terminal does not have a corresponding sidelink wireless bearing configuration (for example, sidelink) When the identifier is collided), this can be notified to the base station.
  • sidelink identifier has been described, but the above-described method has arbitrary sidelink RRC parameters (logical channel configuration information, RLC configuration information, PDCP configuration information, SDAP configuration information).
  • the receiving terminal may receive the first RLC AM PDU to set the receiving AM RLC entity.
  • the aforementioned parameters source L2 ID, destination L2 ID, mapping information between the V2X service / application layer and the destination L2 ID), information for identifying the transmitting terminal in the V2X service / application layer, to identify the corresponding AM RLC entity, Information to identify the destination terminal at the V2X service / application layer, transmission profile of the V2X communication session provided / directed by the upper layer, priority / QoS parameter of the V2X communication session provided / directed by the upper layer), 5QI ( PQI), PC5 5G QoS parameters, sidelink radio bearer identification information, sidelink RLC bearer identification information and one or more of the sidelink logical channel identifiers) may be used.
  • a logical connection may be established through a PC5 sidelink interface between two terminals for unicast V2X communication using the RLC AM function.
  • a connection through a direct interface (PC5 interface) between terminals is indicated as a logical connection.
  • the logical connection may be a logical connection between terminals on the AS similar to the RRC connection, a logical connection between terminals at a higher layer such as PC5 signaling, or a logical connection between terminals at the application layer. have.
  • the transmitting terminal wishing to perform unicast V2X communication transmits a PC5 signaling message for requesting V2X direct communication to the receiving terminal.
  • the PC5 signaling message may include the aforementioned AM RLC configuration information.
  • the PC5 signaling message includes source L2 ID, destination L2 ID, mapping information between the V2X service / application layer and destination L2 ID, information for identifying the transmitting terminal in the V2X service / application layer, and identifying the destination terminal in the V2X service / application layer.
  • the receiving terminal may configure a corresponding AM RLC entity and other L2 entities (PDCP entity, SDAP entity) associated with the configuration information.
  • the transmitting terminal wishing to perform unicast V2X communication transmits an RRC signaling message for configuring V2X direct communication to the receiving terminal.
  • the RRC signaling message may include AM RLC configuration information described above.
  • the RRC signaling message includes source L2 ID, destination L2 ID, mapping information between the V2X service / application layer and destination L2 ID, information for identifying the transmitting terminal in the V2X service / application layer, and identifying the destination terminal in the V2X service / application layer.
  • the receiving terminal may configure the corresponding AM RLC entity and other L2 entities (PDCP entity, SDAP entity) associated with the configuration information.
  • the SDAP configuration information includes information for mapping a corresponding QoS flow to a sidelink radio bearer similar to NR.
  • the SDAP configuration information included in the sidelink radio bearer configuration information may include PFI information.
  • the SDAP configuration information included in the sidelink radio bearer configuration information may include one or more information of a V2X service type, a source L2 ID, a destination L2 ID, and an application layer ID linked to PFI information.
  • a side link data radio bearer can be set.
  • the UE establishes a logical connection through PC5 signaling of the upper layer
  • the upper layer of the UE informs the RRC.
  • the RRC of the terminal may perform an RRC signaling transmission operation on the sidelink interface. If the logical connection is released through the upper layer PC5 signaling, the upper layer of the terminal informs the RRC.
  • the RRC can release the associated sidelink RRC connection and sidelink data radio bearer.
  • a transmitting terminal that intends to perform unicast V2X communication transmits an application layer signaling message for requesting V2X direct communication to a receiving terminal.
  • the application layer signaling message may include the aforementioned AM RLC configuration information.
  • the application layer signaling message includes source L2 ID, destination L2 ID, mapping information between the V2X service / application layer and destination L2 ID, information for identifying the transmitting terminal in the V2X service / application layer, and identifying the destination terminal in the V2X service / application layer.
  • transmission profile of V2X communication session provided / directed by the upper layer priority / QoS parameter of V2X communication session provided / directed by the upper layer, 5QI (PQI), PC5 5G QoS parameter, sidelink radio It may include one or more configuration information of bearer identification information, sidelink RLC bearer identification information, sidelink logical channel identifier, SDAP configuration information for a corresponding V2X communication session, and PDCP configuration information.
  • the receiving terminal may configure the corresponding AM RLC entity and other L2 entities (PDCP entity, SDAP entity) associated with the configuration information.
  • PC5 may be directed to the terminal through a network (e.g. base station).
  • a network e.g. base station.
  • the transmitting terminal requests the network through the Uu interface, and the network may transmit signaling including the sidelink radio bearer configuration information including the above-described sidelink AM RLC configuration information to the receiving terminal through the Uu interface.
  • the receiving terminal may configure the sidelink AM RLC entity and other associated L2 entities (PDCP entity, SDAP entity) based on the sidelink AM RLC configuration information received by the network.
  • the receiving terminal may configure the sidelink radio bearer by receiving the configuration information of the sidelink radio bearer.
  • a transmitting terminal may request sidelink radio bearer configuration information including sidelink AM RLC configuration information to a network through a Uu interface.
  • the network transmits signaling including sidelink radio bearer configuration information including sidelink AM RLC configuration information to a transmitting terminal through a Uu interface.
  • the transmitting terminal may configure the sidelink AM RLC entity and other associated L2 entities (PDCP entity, SDAP entity) based on the received sidelink AM RLC configuration information.
  • the transmitting terminal instructs signaling including sidelink AM RLC configuration information to the receiving terminal through the PC5 interface.
  • the receiving terminal may configure the corresponding sidelink AM RLC entity and other associated L2 entities (PDCP entity, SDAP entity) based on the sidelink AM RLC configuration information.
  • the transmitting terminal may receive the sidelink radio bearer configuration information through the network.
  • the transmitting terminal may transmit the sidelink radio bearer configuration information received through the network to the receiving terminal.
  • the receiving terminal may configure the sidelink radio bearer by receiving the sidelink radio bearer configuration information.
  • the above-described method may be applied to the configuration of the sidelink radio bearer of the RRC connected state terminal.
  • the transmitting terminal may perform sidelink communication by receiving sidelink radio bearer configuration information through a network and transmitting it to the receiving terminal.
  • a terminal in an RRC IDLE state or an RRC Inactive state can also perform sidelink communication.
  • the RRC IDLE state or RRC Inactive state terminal may receive sidelink radio bearer configuration information through a network through system information.
  • the transmitting terminal may receive sidelink radio bearer configuration information transmitted as system information through a network.
  • the transmitting terminal may transmit the sidelink radio bearer configuration information received through the system information to the receiving terminal.
  • the receiving terminal may configure the side link radio bearer by receiving the corresponding information.
  • the transmitting terminal may receive sidelink radio bearer configuration information transmitted as system information through a network.
  • the transmitting terminal may transmit the sidelink radio bearer configuration information received through the system information to the receiving terminal.
  • the transmitting terminal may receive side link radio bearer configuration information transmitted as system information through a network.
  • the receiving terminal may configure a side link radio bearer when the information received from the transmitting terminal and the information received through the system information are the same.
  • the network may indicate information for indicating an arbitrary operation for the above-described embodiment to the terminal through system information (or RRC-only message). The above-described embodiment may also be applied to an RRC connected state terminal.
  • the sidelink AM RLC configuration information may be included in the sidelink radio bearer configuration information. Therefore, the contents described above with the AM RLC configuration information can be replaced with the sidelink radio bearer configuration information.
  • the UE in the RRC connected state detects RLF (Radio Link Failure). The operation at the time of detection of the maximum retransmission between the terminal and the base station will be described.
  • an upon indication from MCG RLC that the maximum number of retransmissions has been reached for an SRB or for an MCG or split DRB from an MCG RLC entity When detected, the RLC entity indicates this to the RRC layer, and the RRC considers the MCG radio link failure.
  • the RLF information In the case of a radio link failure for MCG, when the UE detects RLF, the RLF information is stored in the VarRLF-Report. If AS security is not activated, the terminal releases the RRC Connected state. That is, the terminal transitions to the RRC IDLE state. Alternatively, when AS security is activated, the terminal performs an RRC Connection Re-establishment procedure.
  • the RLC entity when the maximum number of retransmissions is detected from the SCG RLC entity, the RLC entity indicates this to the RRC layer and the RRC considers it as an SCG radio link failure.
  • the terminal instructs the SCG radio link failure to the base station through the SCG failure information procedure.
  • the UE transmits the failure type to the RRC message (SCGFailureInformationNR message) transmitted to the base station as information (rlc-MaxNumRetx) for indicating that the SCG RLC has reached the maximum retransmission.
  • V2X communication may be performed not only in the RRC connected state terminal but also in the RRC idle / inactive state terminal.
  • the terminal in the RRC idle / inactive state can perform unicast V2X communication using the RLC AM function through the PC5 interface. If the maximum number of retransmissions for a specific radio bearer is detected from the sidelink communication RLC entity, the sidelink RLC entity may indicate this to the RRC (or any higher layer or PC5 RRC or PC5-Signalling layer). Alternatively, the sidelink RLC entity may inform the PC5 RRC and indicate it to the PC5-Signalling layer in the PC5 RRC. The UE in the RRC idle / inactive state may record a log of the failure to reach the sidelink maximum RLC retransmission.
  • Corresponding logging includes cause information, RRC IDLE / serving cell identifier of inactive terminal (servCellIdentity or physical cell identifier), SSB frequency, serving cell measurement result (measResultServCell), cell level measurement result based on SS / PBCH related measurement, SS / Beam level measurement result based on PBCH related measurement, cell level measurement result based on CSI-RS related measurement, beam level measurement result based on CSI-RS related measurement, measurement type (SS / PBCH or CSI-RS, cell level or beam level) ), Carrier identifier performing side link communication, carrier frequency, TX resource pool, RX resource pool, measurement result of the corresponding carrier, time to reach the maximum RLC retransmission of the side link (eg timestamp or elapsed time since session start), location information And information for identifying a V2X communication session through a corresponding sidelink.
  • RRC IDLE serving cell identifier of inactive terminal
  • SSB frequency serving cell measurement result
  • information for identifying a V2X communication session through the corresponding sidelink includes source L2 identifier, destination L2 identifier, source IP address, destination IP address, information for identifying the source terminal, information for identifying the destination terminal, and application identifier , Identification information for identifying a specific service / session number of the application, V2X service type, V2X application layer identifier, 5QI (PQI), PC5 5G QoS parameter, PFI, sidelink radio bearer identification information, sidelink RLC bearer identification information And one or more of the side link logical channel identifiers.
  • the base station may transmit information instructing the UE to perform a corresponding logging (or logged measurement) operation in the RRC IDLE / Inactive state to the UE.
  • Information for instructing to perform a logging operation may be delivered through system information or dedicated signaling.
  • Information for instructing to perform the logging operation may include configuration information necessary for the terminal to perform the logging operation.
  • the RRC IDLE / inactive terminal establishes an RRC connection and enters the RRC connection state (or in the RRC connection setup process or in the RRC connection state), logging information logged to the terminal (or indicating that the corresponding logging information is available) Information) to the base station. If the information for indicating that the logging information is available is transmitted to the base station, the base station may transmit a separate signaling instructing the terminal to transmit the logged logging information to the terminal. Upon receiving a separate signaling, the terminal may transmit logging information to the base station.
  • V2X communication may be performed not only in the RRC connected state terminal but also in the RRC idle / inactive state terminal.
  • the terminal in the RRC idle / inactive state can perform unicast V2X communication using the RLC AM function through the PC5 interface. If the maximum number of retransmissions for a specific radio bearer is detected from the sidelink communication RLC entity, the sidelink RLC entity may indicate this to the RRC (or any higher layer or PC5 RRC or PC5-Signalling layer). Alternatively, the sidelink RLC entity may inform the PC5 RRC and indicate it to the PC5-Signalling layer in the PC5 RRC.
  • the terminal in the RRC idle / inactive state establishes an RRC connection to configure the associated V2X communication session through the network (or for any other reason, such as reporting). Should be set. To this end, the terminal may transition to the RRC connection state.
  • the cause of the RRC setting of the conventional NR can be configured to include a new setting cause or operator-defined setting cause different from VoiceCall, mo-VideoCall, mo-SMS, mps-PriorityAccess, and mcs-PriorityAccess).
  • the UE may establish an RRC connection using one of the causes of RRC establishment in the conventional NR.
  • the terminal As a V2X control function that provides parameters necessary to use V2X communication as a terminal, the terminal (upper layer of the terminal) can transmit sidelink failure information according to the maximum retransmission of the sidelink RLC (via the V3 interface).
  • the terminal (upper layer of the terminal) may transmit sidelink failure information according to the maximum retransmission of the sidelink RLC to the V2X application server (via the V1 interface).
  • the terminal may transmit sidelink failure information according to the arrival of the sidelink RLC maximum retransmission to the base station through the Uu interface.
  • the terminal may transmit sidelink failure information according to the arrival of the sidelink RLC maximum retransmission to the core network entity (eg, AMF).
  • the core network entity eg, AMF
  • Sidelink failure information according to the arrival of the sidelink RLC maximum retransmission may include at least one of the following information.
  • source L2 identifier for identifying a V2X communication session through the corresponding sidelink: source L2 identifier, destination L2 identifier, source IP address, destination IP address, information for identifying the source terminal, information for identifying the destination terminal, application identifier, Identification information to identify a specific service / session number of the application, V2X service type, V2X application layer identifier, 5QI (PQI), PC5 5G QoS parameter, PFI, sidelink radio bearer identification, sidelink RLC bearer identification and side Contains information on at least one of the link logical channel identifiers.
  • the transmitting terminal may configure a V2X communication session through the network and the receiving terminal of the sidelink failure to transmit and receive data. That is, the transmitting terminal may resume the suspended sidelink V2X communication session through the V2X communication session through the network.
  • the terminal in the RRC connection state can perform unicast V2X communication using the RLC AM function through the PC5 interface. If the maximum number of retransmissions for a specific radio bearer is detected from the sidelink communication RLC entity, the sidelink RLC entity may indicate this to the RRC (or any higher layer or PC5 RRC or PC5-Signalling layer). Alternatively, the sidelink RLC entity may inform the PC5 RRC and indicate it to the PC5-Signalling layer in the PC5 RRC.
  • the RRC of the terminal may transmit sidelink failure information to the base station through an uplink RRC message.
  • the UE may transmit a failure type (failuretype) to the corresponding RRC message by setting the maximum number of sidelink RLC retransmissions. Through this, the base station can recognize the problem on the sidelink communication.
  • the base station that recognizes the arrival of the maximum number of retransmissions of the sidelink communication RLC may instruct the terminal to switch the V2X communication through the corresponding sidelink to the V2X communication through the network (or through the Uu interface).
  • the terminal may switch V2X communication through the sidelink to V2X communication through the network (or via the Uu interface) when the sidelink communication RLC maximum retransmission is reached.
  • Configuration information necessary to perform a switching operation from the network may be pre-configured in the terminal.
  • the switching operation may refer to an operation connected between a terminal and a V2X control function or a terminal and a V2X application server through a network.
  • the switching operation is based on the information received from the V2X Control function or the V2X application server, and the terminal connects the V2X communication session through the network with the receiving terminal to perform a procedure for switching the sidelink V2X communication session to the V2X communication session through the network. It can mean doing.
  • the switching operation is pre-connected through the network between the terminal and the V2X control function or the terminal and the V2X application server, or based on the information received from the V2X control function or the V2X application server, the terminal establishes a V2X communication session through the receiving terminal and the network.
  • a switching operation may be indicated in a state in which a failed V2X communication session is configured in association with a sidelink RLC entity and a Uu RLC entity in one PDCP entity.
  • a switching operation may be indicated in a state in which a failed V2X communication session is configured in association with a sidelink PDCP entity and a Uu PDCP entity in one SDAP entity.
  • the switching operation can be provided by switching the L2 entity of the V2X communication session via the sidelink to the L2 entity of the V2X communication session via the Uu interface, and can be switched at the PDCP or SDAP layer for lossless transmission.
  • the PDCP entity may perform retransmission for unidentified PDCP PDUs.
  • Configuration information needed to perform / associate the switching of the V2X communication session at the PDCP layer or SDAP layer includes information for identifying the V2X communication session, priority / QoS parameters of the V2X communication session, V2X service / application layer and destination L2 ID Mapping information with, information for identifying the transmitting terminal at the V2X service / application layer, information for identifying the destination terminal at the V2X service / application layer, among the transmission profile of the V2X communication session through the sidelink, the source L2 ID and the destination L2 ID It may include at least one piece of information. Configuration information may be pre-configured in the terminal or may be received by the base station.
  • the terminal in the RRC connection state can perform unicast V2X communication using the RLC AM function through the PC5 interface. If the maximum number of retransmissions for a specific radio bearer is detected from the sidelink communication RLC entity, the sidelink RLC entity may indicate this to the RRC (or any higher layer or PC5 RRC or PC5-Signalling layer). Alternatively, the sidelink RLC entity may inform the PC5 RRC and indicate it to the PC5-Signalling layer in the PC5 RRC.
  • the terminal may attempt to reset the corresponding V2X communication through any PC5 signaling procedure (e.g. discovery procedure, Layer2 link setup procedure, Layer2 link reset procedure, Layer2 link recovery procedure, etc.) through the sidelink.
  • PC5 signaling procedure e.g. discovery procedure, Layer2 link setup procedure, Layer2 link reset procedure, Layer2 link recovery procedure, etc.
  • the terminal detects that the maximum number of retransmissions performed for the radio bearer is detected from the sidelink communication RLC entity, the UE suspends the RLC entity.
  • the PC5 RRC connection including the corresponding RLC entity is released.
  • the transmitting terminal is the destination L2 ID, the source terminal information (the initiating UE's Application Layer ID) and the target UE's Application Layer corresponding to the sidelink radio bearer that declared the sidelink radio link failure.
  • the terminal includes information for identifying a V2X communication session, priority / QoS parameters of the V2X communication session, mapping information between the V2X service / application layer and the destination L2 ID, information for identifying a transmitting terminal in the V2X service / application layer, and V2X service / At the application layer, attempts to recover V2X communication using information for identifying a destination terminal, a transmission profile of a V2X communication session through a side link, and one or more of a source L2 ID and a destination L2 ID.
  • maximum transmission count information for any PC5 signaling signal such as discovery / reset / recovery may be preconfigured or configured by a network.
  • the PDCP entity may perform retransmission for unidentified PDCP PDUs.
  • the method of each of the embodiments described above can be applied to an RRC idle / inactive state terminal as well as an RRC connected state terminal.
  • the method of each embodiment may be operated by any trigger rather than reaching the maximum number of retransmissions of the sidelink communication RLC.
  • a base station or a terminal may initiate a corresponding operation in consideration of the quality / load status of a side link, and this is also included in the scope of the present disclosure.
  • the present disclosure can provide an enhanced V2X service by supporting sidelink communication applying the RLC AM function.
  • the present disclosure reduces the service interruption even when detecting sidelink radio failure due to RLC retransmission failure, and provides an effect of maintaining V2X communication.
  • FIG. 13 is a view for explaining a terminal configuration according to an embodiment.
  • a terminal 1300 performing vehicle communication configures sidelink radio bearer configuration information for configuring a sidelink radio bearer on a sidelink interface used for vehicle communication.
  • the sidelink radio bearer Based on the receiving unit 1330 and the sidelink radio bearer configuration information received from the base station, the sidelink radio bearer is configured, and when the AM RLC entity associated with the sidelink radio bearer reaches the maximum number of retransmissions, the sidelink radio It may include a control unit 1310 for detecting a link failure and a transmitting unit 1320 that transmits the side link radio bearing configuration information to another terminal targeted for vehicle communication.
  • the controller 130 may control the sidelink radio link failure detection to be directed to the upper layer regardless of the RRC state of the terminal.
  • the reception unit 1330 receives sidelink radio bearer configuration information from a base station.
  • the sidelink radio bearer configuration information may include RLC bearer configuration information.
  • the RLC bearer configuration information may include parameters necessary to configure the AM RLC entity for the sidelink.
  • the RLC bearer configuration information may include information for bidirectional AM RLC configuration through uplink AM RLC configuration information and downlink AM RLC configuration information.
  • the controller 1310 configures the AM RLC entity for the sidelink to the terminal using the sidelink radio bearer configuration information.
  • the controller 1310 may set a side link radio bearer for vehicle communication and link it to the configured AM RLC entity.
  • One or more sidelink radio bearers may be configured, or may be configured for each V2X service.
  • the receiving unit 1330 since the receiving unit 1330 transmits and receives vehicle communication data through the AM RLC entity, it receives an acknowledgment message for the transmitted data from the receiving terminal. If an acknowledgment message (ex, ACK message) for specific transmission data is not received, the AM RLC entity of the terminal 1300 performs a retransmission operation.
  • the control unit 1310 recognizes that a problem has occurred in the corresponding sidelink when the number of retransmissions for the specific transmission data in the sidelink AM RLC entity reaches the maximum number of retransmissions indicated by the base station or preset. For example, the terminal may detect a radio link failure of the sidelink through which transmission data is transmitted. In this case, the terminal needs to request scheduling of a new sidelink radio resource to the base station when the base station allocates the sidelink radio resource. Or, the base station needs to be aware of the radio link failure of the sidelink for any reason.
  • the terminal may indicate this to the upper layer regardless of the RRC state of the terminal.
  • the transmitter 1320 may transmit sidelink failure information to the base station when the number of retransmissions for specific transmission data in the AM RLC entity of the terminal is indicated by the base station or reaches a preset maximum number of retransmissions.
  • the sidelink failure information includes at least one of serving cell identification information, serving cell measurement result information, sidelink carrier identification information, time stamp information, terminal location information, destination L2 ID information, and V2X session identification information. can do. If necessary, the base station may allocate new sidelink radio resources to the terminal 1300. Or, the base station may instruct switching so that the V2X session is processed over the network.
  • the sidelink failure information may include sidelink RRC failure type information when the terminal 1300 is in an RRC connection state.
  • the terminal 1300 in the RRC connection state can also transmit and receive data to and from the base station. Therefore, when the terminal 1300 is in the RRC connection state, the transmitter 1320 includes RRC failure type information indicating that the sidelink is failed due to exceeding the number of retransmissions in the sidelink (or a specific radio bearer) in the sidelink failure information. Can be transmitted.
  • the sidelink failure information may be transmitted to the base station through the RRC connection establishment procedure of the terminal 1300 when the terminal 1300 is in an RRC idle state or an RRC inactive state.
  • sidelink failure information may be transmitted to the base station in the process of the terminal 1300 establishing an RRC connection with the base station or after the RRC connection is established.
  • sidelink failure information may be transmitted to the base station in the process of resuming the RRC connection for the terminal 1300 to transition to the RRC connection state or after the RRC connection is established.
  • the sidelink identifier selected according to the configuration of the sidelink radio bearer may include at least one of sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier.
  • the sidelink identifier may be selected by the terminal 1300 or another terminal.
  • the controller 1310 may select and allocate sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier.
  • other terminals may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • the sidelink identifier selected by the terminal 1300 or another terminal must be shared between the terminal (! 300) and another terminal, and must be recognized in the same sense. Therefore, the terminal and the other terminal can share the sidelink identifier.
  • the terminal 1300 selects the sidelink identifier
  • the other terminal may have already allocated the identifier for other purposes or for sidelink communication with another third terminal. Therefore, a processing procedure is required in this case.
  • the other terminal may transmit failure information to the base station or the selected terminal.
  • the sidelink radio bearer configuration information may be received in a different procedure according to the RRC state of the terminal 1300.
  • sidelink radio bearer configuration information may be received according to a sidelink radio bearer request signal including QoS parameters of a V2X sidelink session transmitted by the terminal 1300 to the base station.
  • the transmitter 1320 transmits a sidelink radio bearer request signal to the base station.
  • the sidelink radio bearer request signal includes QoS parameters of the V2X sidelink session.
  • the base station may transmit the sidelink radio bearer configuration information to the terminal 1300 based on the sidelink radio bearer request signal. If necessary, sidelink radio bearer configuration information may be generated in association with QoS parameters of a V2X sidelink session.
  • sidelink radio bearer configuration information may be received through system information. That is, the base station may broadcast the system information by including sidelink radio bearer configuration information.
  • controller 1310 controls the operation of the overall terminal 1300 according to the AM RLC-based sidelink communication setup and sidelink failure processing operations required to perform the above-described embodiments.
  • the transmitter 1320 and the receiver 1330 are used to transmit and receive signals, messages, and data necessary to perform the above-described embodiments with base stations, other terminals, and respective entities on the V2X architecture.
  • FIG. 14 is a diagram for explaining a configuration of a base station according to an embodiment.
  • a base station 1400 for controlling vehicle to everything communication configures sidelink radio bearer configuration information for configuring a sidelink radio bearer on a sidelink interface used for vehicle communication.
  • Receiving sidelink failure information from the terminal which occurs when the number of retransmissions of the transmission data in the AM RLC entity configured in the terminal reaches the maximum number of retransmissions, based on the transmitter 1420 and the sidelink radio bearer configuration information that transmits data to the terminal It may include a receiving unit 1430.
  • the sidelink radio bearer configuration information may include RLC bearer configuration information.
  • the RLC bearer configuration information may include parameters necessary for the UE to configure the AM RLC entity for the sidelink.
  • the RLC bearer configuration information may include information for bidirectional AM RLC configuration through uplink AM RLC configuration information and downlink AM RLC configuration information.
  • the terminal configures the AM RLC entity for the sidelink to the terminal using the sidelink radio bearer configuration information.
  • the terminal may set a side link radio bearer for vehicle communication and link it to the configured AM RLC entity.
  • One or more sidelink radio bearers may be configured, or may be configured for each V2X service.
  • the terminal configures the sidelink radio bearer based on the sidelink radio bearer configuration information, and detects whether the number of retransmissions of data transmitted through the sidelink radio bearer reaches the maximum number of retransmissions in the AM RLC entity associated with the sidelink radio bearer. can do.
  • the terminal recognizes that a problem has occurred in the corresponding sidelink.
  • the receiving unit 1430 receives sidelink failure information from the terminal when the number of retransmissions for a specific transmission data in the AM RLC entity of the terminal reaches a preset maximum number of retransmissions.
  • the sidelink failure information includes at least one of serving cell identification information, serving cell measurement result information, sidelink carrier identification information, time stamp information, terminal location information, destination L2 ID information, and V2X session identification information. can do.
  • the sidelink failure information may include sidelink RRC failure type information when the terminal is in the RRC connection state.
  • the control unit 1410 may receive sidelink failure information including RRC failure type information indicating that the sidelink has failed due to exceeding the number of retransmissions in the sidelink (or a specific radio bearer) to obtain information about the failure type. .
  • the sidelink failure information may be received by the receiving unit 1430 through the RRC connection establishment procedure of the terminal.
  • sidelink failure information may be received by the receiver 1430 in the process of establishing an RRC connection with the base station or after the RRC connection is established.
  • sidelink failure information may be received by the receiving unit 1430 in the process of resuming the RRC connection for the terminal to transition to the RRC connection state or after the RRC connection is established.
  • the terminal transmits the sidelink radio bearer configuration information to the other terminal that is the target of vehicle communication.
  • the terminal may inform the other terminal of the sidelink radio bearer parameters related to sidelink transmission and reception by instructing the sidelink radio bearer configuration information.
  • the sidelink identifier selected according to the configuration of the sidelink radio bearer may include at least one of sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier.
  • the sidelink identifier can be selected by the terminal or another terminal.
  • the terminal may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • other terminals may select and allocate the sidelink radio bearer identification information, the sidelink RLC bearer identification information, and the sidelink logical channel identifier.
  • the side link identifier selected by the terminal or another terminal must be shared between the terminal and the other terminal, and must be recognized in the same sense. Therefore, the terminal and the other terminal can share the sidelink identifier.
  • the terminal when the terminal selects the sidelink identifier, the other terminal may have already allocated the identifier for other purposes or for sidelink communication with another third terminal. Therefore, a processing procedure is required in this case.
  • the other terminal may transmit failure information to the base station or the selected terminal. Accordingly, the reception unit 1430 may receive failure information from another terminal.
  • the sidelink radio bearer configuration information may be transmitted through a different procedure according to the RRC state of the terminal.
  • the sidelink radio bearer configuration information may be transmitted according to a sidelink radio bearer request signal including QoS parameters of a V2X sidelink session that the UE transmits to the base station.
  • the receiving unit 1430 receives the sidelink radio bearer request signal from the terminal.
  • the sidelink radio bearer request signal includes QoS parameters of the V2X sidelink session.
  • the transmitter 1420 may transmit the sidelink radio bearer configuration information to the terminal based on the sidelink radio bearer request signal. If necessary, sidelink radio bearer configuration information may be generated in association with QoS parameters of a V2X sidelink session.
  • sidelink radio bearer configuration information may be transmitted through system information. That is, the transmitter 1420 may broadcast the system information by including sidelink radio bearer configuration information.
  • control unit 1410 controls the operation of the overall base station 1400 according to the AM RLC-based sidelink communication setup and sidelink failure processing operations required to perform the above-described embodiments.
  • the transmitter 1420 and the receiver 1430 are used to transmit and receive signals, messages, and data necessary to perform the above-described embodiments.
  • the above-described embodiments can be implemented through various means.
  • the embodiments may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to the embodiments includes one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs (Field Programmable Gate Arrays), a processor, a controller, a microcontroller, or a microprocessor.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • processor a controller, a microcontroller, or a microprocessor.
  • the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function that performs the functions or operations described above.
  • the software code can be stored in a memory unit and driven by a processor.
  • the memory unit is located inside or outside the processor, and can exchange data with the processor by various known means.
  • system generally refer to computer-related object hardware, hardware and software. It can mean a combination of, software or running software.
  • the above-described components may be, but are not limited to, processes, processors, controllers, control processors, entities, threads of execution, programs and / or computers driven by a processor.
  • an application running on a controller or processor and a controller or processor can be components.
  • One or more components can be in a process and / or thread of execution, and the components can be located on one device (eg, a system, computing device, etc.) or distributed across two or more devices.

Landscapes

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

Abstract

La présente invention concerne un appareil et un procédé de fourniture d'un service V2X dans une nouvelle technologie d'accès radio (Nouvelle RAT). Un mode de réalisation concerne un procédé et un appareil de configuration d'une porteuse de radio de liaison latérale sur une interface de liaison latérale utilisée pour une communication de véhicule et traiter une défaillance de liaison radio.
PCT/KR2019/014110 2018-10-26 2019-10-25 Appareil et procédé de réalisation d'une communication de véhicule WO2020085831A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19876374.0A EP3873128B1 (fr) 2018-10-26 2019-10-25 Appareil et procédé de réalisation d'une communication de véhicule
CN201980070591.0A CN112930694A (zh) 2018-10-26 2019-10-25 用于执行车辆通信的方法和装置
US17/288,899 US11917706B2 (en) 2018-10-26 2019-10-25 Method and apparatus for performing vehicle communication

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR20180129296 2018-10-26
KR10-2018-0129296 2018-10-26
KR1020190092446A KR20200049493A (ko) 2018-10-26 2019-07-30 차량 통신을 수행하는 방법 및 그 장치
KR10-2019-0092446 2019-07-30
KR1020190133057A KR102296467B1 (ko) 2018-10-26 2019-10-24 차량 통신을 수행하는 방법 및 그 장치
KR10-2019-0133057 2019-10-24

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WO2022068714A1 (fr) * 2020-09-29 2022-04-07 维沃移动通信有限公司 Procédé et appareil de configuration de transmission, et dispositif
WO2023020378A1 (fr) * 2021-08-17 2023-02-23 维沃移动通信有限公司 Procédé de transmission agrégée multi-ue de données, et dispositif
CN116033601A (zh) * 2021-10-25 2023-04-28 华硕电脑股份有限公司 中继用户设备侧链路无线电链路控制承载配置方法和设备
EP4178145A4 (fr) * 2020-07-24 2024-01-10 Huawei Technologies Co., Ltd. Procédé de configuration de support radio de signalisation de liaison latérale, et appareil de communication

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Publication number Priority date Publication date Assignee Title
EP4178145A4 (fr) * 2020-07-24 2024-01-10 Huawei Technologies Co., Ltd. Procédé de configuration de support radio de signalisation de liaison latérale, et appareil de communication
WO2022068714A1 (fr) * 2020-09-29 2022-04-07 维沃移动通信有限公司 Procédé et appareil de configuration de transmission, et dispositif
CN114339714A (zh) * 2020-09-29 2022-04-12 维沃移动通信有限公司 传输配置的方法、装置和设备
CN114339714B (zh) * 2020-09-29 2023-07-11 维沃移动通信有限公司 传输配置的方法、装置和设备
WO2023020378A1 (fr) * 2021-08-17 2023-02-23 维沃移动通信有限公司 Procédé de transmission agrégée multi-ue de données, et dispositif
CN116033601A (zh) * 2021-10-25 2023-04-28 华硕电脑股份有限公司 中继用户设备侧链路无线电链路控制承载配置方法和设备
EP4175399A1 (fr) * 2021-10-25 2023-05-03 ASUSTek Computer Inc. Procédé et appareil pour une configuration de porteuse rlc de liaison latérale d'ue de relais pour prendre en charge un relais d'ue à réseau dans un système de communication sans fil
CN116033601B (zh) * 2021-10-25 2024-02-13 华硕电脑股份有限公司 中继用户设备侧链路无线电链路控制承载配置方法和设备

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