WO2019212249A1 - Procédé de traitement de données via un nœud relais, et appareil associé - Google Patents

Procédé de traitement de données via un nœud relais, et appareil associé Download PDF

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Publication number
WO2019212249A1
WO2019212249A1 PCT/KR2019/005251 KR2019005251W WO2019212249A1 WO 2019212249 A1 WO2019212249 A1 WO 2019212249A1 KR 2019005251 W KR2019005251 W KR 2019005251W WO 2019212249 A1 WO2019212249 A1 WO 2019212249A1
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Prior art keywords
pdcp
data
base station
terminal
donor base
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PCT/KR2019/005251
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English (en)
Korean (ko)
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홍성표
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주식회사 케이티
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Priority claimed from KR1020190050268A external-priority patent/KR20190127561A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Publication of WO2019212249A1 publication Critical patent/WO2019212249A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • the present disclosure relates to data processing and data retransmission techniques through relay nodes.
  • relay technology has been used to extend cell coverage using additional network nodes.
  • the relay technology to which the conventional LTE technology is applied supports data transmission at the IP packet level of the relay node, and only one relay node is configured to transmit the IP packet between the terminal and the base station.
  • the relay technology to which the conventional LTE technology is applied provides only a single hop relay function to provide a simple service, and most of the configuration is indicated and configured through static OAM (Operations, administration and management). As a result, a plurality of hop relays could not be configured.
  • an embodiment of the present disclosure is to propose a technique for securing reliability of transmission / reception data between a terminal and a donor base station when a plurality of relay hops are configured.
  • an embodiment proposes a data processing operation according to a change of a backhaul link in a multi-hop relay structure.
  • a Packet Data Convergence Protocol (PDCP) entity in a method in which a terminal transmits data through one or more relay nodes, includes one PDCP data for an AM Acknowledged Mode Data Radio Bearer (DRB).
  • the PDCP data protocol data unit (PDU) or SDU (Service) service in the PDCP entity based on the step of transmitting to the donor base station through the relay node, the step of receiving retransmission indication information indicating PDCP data retransmission from the donor base station, and the retransmission indication information.
  • Retransmitting Data Unit is provided.
  • an embodiment is a method in which a donor base station transmits data through one or more relay nodes, wherein a Packet Data Convergence Protocol (PDCP) entity receives PDCP data for an AM Acknowledged Mode Data Radio Bearer (DRB) at least one relay node.
  • PDCP Packet Data Convergence Protocol
  • DRB AM Acknowledged Mode Data Radio Bearer
  • a packet data convergence protocol (PDCP) entity may donor PDCP data for an AM Acknowledged Mode Data Radio Bearer (DRB) through one or more relay nodes.
  • DRB AM Acknowledged Mode Data Radio Bearer
  • PDU PDCP data protocol data unit
  • SDU service data unit
  • It provides a terminal device including a control unit for controlling.
  • an embodiment of the present invention provides a donor base station that transmits data through one or more relay nodes, wherein a Packet Data Convergence Protocol (PDCP) entity receives PDCP data for an AM Acknowledged Mode Data Radio Bearer (DRB) through one or more relay nodes.
  • PDCP Packet Data Convergence Protocol
  • DRB AM Acknowledged Mode Data Radio Bearer
  • Control the PDCP entity to retransmit the PDCP data PDU (Service Data Unit) or SDU (Service Data Unit) on the basis of the transmitter and the retransmission instruction that receives the retransmission instruction information instructing the retransmission of PDCP data from the terminal.
  • PDU Service Data Unit
  • SDU Service Data Unit
  • the present disclosure provides the effect of improving the reliability of data transmission by using a plurality of relay hops.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR wireless communication system to which an embodiment of the present invention may be applied.
  • FIG. 2 is a view 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 is a diagram exemplarily illustrating 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. 7 is a diagram illustrating an example of a relay-based user plane protocol structure in LTE technology.
  • 8 (A) and 8 (B) illustrate a relay node start up procedure in a LTE technology.
  • 9 to 13 are diagrams for describing various examples of an L2-based relay structure according to an embodiment.
  • FIG. 14 is a diagram for describing a data retransmission operation of a terminal, according to an exemplary embodiment.
  • FIG. 15 illustrates a data retransmission operation of a donor base station according to an embodiment.
  • 16 is a diagram illustrating a PDCP data PDU format according to an embodiment.
  • FIG. 17 illustrates a peering model of a UM RLC entity.
  • FIG. 18 is a diagram illustrating AM RLC configuration information according to an embodiment.
  • 19 is a block diagram illustrating a terminal configuration according to an embodiment.
  • 20 is a block diagram illustrating a donor base station configuration according to an embodiment.
  • first, second, A, B, (a), and (b) may be used. These terms are only to distinguish the components from other components, and the terms are not limited in nature, order, order, or number of the components. If a component is described as being “connected”, “coupled” or “connected” to another component, that component may be directly connected to or connected to that other component, but between components It is to be understood that the elements may be “interposed” or each component may be “connected”, “coupled” or “connected” through other components.
  • the wireless communication system herein refers to a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, and a core network.
  • the embodiments disclosed below may be applied to a wireless communication system using various wireless access technologies.
  • the embodiments of the present invention may include code division multiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA).
  • CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented in a wireless technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems 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), employing OFDMA in downlink and SC- in uplink FDMA is adopted.
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • E-UMTS evolved UMTS
  • E-UTRA evolved-UMTS terrestrial radio access
  • the embodiments may be applied to a wireless access technology that is currently disclosed or commercialized, and may be applied to a wireless access technology that is
  • the terminal in the present specification is a comprehensive concept of a device including a wireless communication module for communicating with a base station in a wireless communication system, and includes a UE in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio).
  • (User Equipment) should be interpreted as a concept that includes a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and the like in GSM.
  • the terminal may be a user portable device such as a smart phone according to a usage form, and may mean a vehicle, a device including a wireless communication module in a vehicle, and the like in a V2X communication system.
  • a machine type communication (Machine Type Communication) system may mean an MTC terminal, an M2M terminal equipped with a communication module to perform machine type communication.
  • a base station or a cell of the present specification refers to an end point that communicates with a terminal in terms of a network, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, a Low Power Node, and an LPN. Sector, site, various types of antenna, base transceiver system (BTS), access point, access point (for example, transmission point, reception point, transmission point and reception point), relay node ), A mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell.
  • BTS base transceiver system
  • RRH remote radio head
  • RU radio unit
  • the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the wireless area, or 2) the wireless area itself. In 1) all devices that provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from the viewpoint of the user terminal or the position of a neighboring base station.
  • a cell refers to a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • Uplink means a method for transmitting and receiving data to the base station by the terminal
  • downlink Downlink (Downlink, DL, or downlink) means a method for transmitting and receiving data to the terminal by the base station do.
  • Downlink may mean a communication or communication path from the multiple transmission and reception points to the terminal
  • uplink may mean a communication or communication path from the terminal to the multiple transmission and reception points.
  • the transmitter in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal.
  • uplink a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • Uplink and downlink transmit and receive control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • Data is transmitted and received by configuring the same data channel.
  • a situation in which a signal is transmitted and received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is described as 'transmit and receive PUCCH, PUSCH, PDCCH, and PDSCH'. do.
  • 3GPP After researching 4G (4th-Generation) communication technology, 3GPP is conducting research on 5G (5th-Generation) communication technology to meet the requirements of ITU-R next generation wireless access technology. Specifically, 3GPP is conducting research on a new NR communication technology separate from LTE-A pro and 4G communication technology, in which LTE-Advanced technology is enhanced to meet the requirements of ITU-R as 5G communication technology.
  • LTE-A pro and NR both appear to be submitted in 5G communication technology, but for the convenience of description, the following describes the embodiments of the present invention mainly on NR.
  • Operational scenarios in NR defined various operational scenarios by adding considerations to satellites, automobiles, and new verticals in the existing 4G LTE scenarios.In terms of services, they have eMBB (Enhanced Mobile Broadband) scenarios and high terminal density. Supports a range of mass machine communication (MMTC) scenarios that require low data rates and asynchronous connections, and Ultra Reliability and Low Latency (URLLC) scenarios that require high responsiveness and reliability and support high-speed mobility. .
  • MMTC mass machine communication
  • URLLC Ultra Reliability and Low Latency
  • NR discloses a wireless communication system using a new waveform and frame structure technology, low latency technology, mmWave support technology, and forward compatible technology.
  • the NR system proposes various technological changes in terms of flexibility to provide forward compatibility. The main technical features will be described below with reference to the drawings.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR system to which the present embodiment may be applied.
  • an NR system is divided into a 5G core network (5GC) and an NR-RAN part, and the NG-RAN controls a user plane (SDAP / PDCP / RLC / MAC / PHY) and a user equipment (UE). It consists of gNB and ng-eNBs providing a planar (RRC) protocol termination.
  • the gNB interconnects or gNBs and ng-eNBs are interconnected via an Xn interface.
  • gNB and ng-eNB are each connected to 5GC through the NG interface.
  • the 5GC may be configured to include an access and mobility management function (AMF) that is in charge of a control plane such as a terminal access and mobility control function, and a user plane function (UPF), which is in charge of a control function in user data.
  • AMF access and mobility management function
  • UPF user plane function
  • NR includes support for sub-6 GHz frequency bands (FR1, Frequency Range 1) and 6 GHz and higher frequency bands (FR2, Frequency Range 2).
  • gNB means a base station providing the NR user plane and control plane protocol termination to the terminal
  • ng-eNB means a base station providing the E-UTRA user plane and control plane protocol termination to the terminal.
  • the base station described in the present specification should be understood to mean gNB and ng-eNB, and may be used to mean gNB or ng-eNB.
  • a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and a 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 using a low complexity receiver with high frequency efficiency.
  • MIMO Multiple Input Multiple Output
  • the NR transmission neuron is determined based on sub-carrier spacing and cyclic prefix (CP), and based on 15khz as shown in Table 1 below.
  • CP sub-carrier spacing and cyclic prefix
  • the NR's pneumoroller may be classified into five types according to the subcarrier spacing. This is different from the fixed subcarrier spacing of LTE, which is one of 4G communication technologies, to be 15 kHz. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, 120khz, and the subcarrier spacing used for synchronization signal transmission is 15, 30, 12, 240khz. In addition, the extended CP is applied only to the 60khz subcarrier interval.
  • the frame structure (frame) in NR is a frame having a length of 10ms consisting of 10 subframes having the same length of 1ms is defined.
  • One frame may be divided into half frames of 5 ms, and each half frame includes five subframes.
  • one subframe consists of one slot
  • each slot consists of 14 OFDM symbols.
  • 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • the slot is fixedly configured with 14 OFDM symbols in the case of a normal CP, but the length of the slot may vary depending on the subcarrier spacing. For example, in the case of a newerology with a 15khz subcarrier spacing, the slot has a length of 1 ms and the same length as the subframe.
  • the slot includes 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined with a fixed time length, the slot is defined by the number of symbols, the time length may vary according to the subcarrier interval.
  • NR defines a basic unit of scheduling as a slot, and also introduces a mini slot (or subslot or non-slot based schedule) to reduce transmission delay of a radio section.
  • the use of a wide subcarrier spacing shortens the length of one slot in inverse proportion, thereby reducing the transmission delay in the radio section.
  • the mini slot (or sub slot) is for efficient support for the URLLC scenario and can be scheduled in units of 2, 4, and 7 symbols.
  • NR defines uplink and downlink resource allocation at a symbol level in one slot.
  • a slot structure capable of transmitting HARQ ACK / NACK directly within a transmission slot has been defined, and this slot structure will be described as a self-contained structure.
  • NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in the Rel-15.
  • a combination of various slots supports a common frame structure constituting an FDD or TDD frame. For example, 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, and a slot structure in which downlink symbol and uplink symbol are combined are supported.
  • NR also supports that data transmission is distributed and scheduled in one or more slots. Accordingly, the base station can inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot by using a slot format indicator (SFI).
  • SFI slot format indicator
  • the base station may indicate the slot format by using the SFI to indicate the index of the table configured through the RRC signaling to the terminal specific, and may be indicated dynamically through the downlink control information (DCI) or statically or quasi-statically through the RRC. It may be.
  • DCI downlink control information
  • the antenna port is defined such that the channel on which the symbol is carried on the antenna port can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel carrying a symbol on one antenna port can be deduced from the channel carrying the symbol on another antenna port, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the broad characteristics include 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.
  • the Resource Grid since the Resource Grid supports a plurality of numerologies in the same carrier, a resource grid may exist according to each numerology.
  • the resource grid may exist according to the antenna port, subcarrier spacing, and transmission direction.
  • the resource block is composed of 12 subcarriers and is defined only in the frequency domain.
  • a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as shown in FIG. 3, one resource block may vary in size depending on the subcarrier spacing.
  • the NR defines "Point A" serving as a common reference point for the resource block grid, a common resource block, a virtual resource block, and the like.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • the bandwidth part can be designated within the carrier bandwidth and used by the terminal.
  • the bandwidth part is associated with one neuralology and consists of a subset of consecutive common resource blocks and can be dynamically activated over time.
  • the UE is configured with up to four bandwidth parts, respectively, uplink and downlink, and data is transmitted and received using the bandwidth part activated at a given time.
  • uplink and downlink bandwidth parts are set independently, and in the case of unpaired spectrum, to prevent unnecessary frequency re-tunning between downlink and uplink operation.
  • the bandwidth parts of the downlink and the uplink are configured in pairs so as to share the center frequency.
  • the UE performs a cell search and random access procedure to access and communicate with a base station.
  • Cell search is a procedure in which a terminal synchronizes with a cell of a corresponding base station, obtains a physical layer cell ID, and acquires system information by using a synchronization signal block (SSB) transmitted by a base station.
  • SSB synchronization signal block
  • FIG. 5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • an SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), which occupy one symbol and 127 subcarriers, respectively, three OFDM symbols, and a PBCH spanning 240 subcarriers.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the terminal monitors the SSB in the time and frequency domain to receive the SSB.
  • SSB can be transmitted up to 64 times in 5ms.
  • a plurality of SSBs are transmitted in different transmission beams within 5ms, and the UE performs detection assuming that SSBs are transmitted every 20ms based on a specific beam used for transmission.
  • the number of beams available for SSB transmission within 5 ms time may increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted at 3 GHz or less, and up to 8 different SSBs can be transmitted at a frequency band of 3 to 6 GHz and up to 64 different beams at a frequency band of 6 GHz or more.
  • Two SSBs are included in one slot, and the start symbol and the number of repetitions in the slot are determined according to the subcarrier spacing.
  • 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 even where the center of the system band is not, and when supporting broadband operation, a plurality of SSBs may be transmitted in the frequency domain. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency position for monitoring the SSB.
  • the carrier raster and the synchronization raster which are the center frequency position information of the channel for initial access, are newly defined in the NR, and the synchronization raster has a wider frequency interval than the carrier raster, and thus supports fast SSB search of the terminal. Can be.
  • the UE may acquire the MIB through the PBCH of the SSB.
  • the Master Information Block includes minimum information for the UE to receive the remaining system information (RMSI) that the network broadcasts.
  • the PBCH is information about the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (for example, SIB1 neuronological 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.
  • SIB1 neuronological information is equally applied to message 2 and message 4 of the random access procedure for accessing the base station after the terminal completes the cell search procedure.
  • the aforementioned RMSI means 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 an initial random access procedure and is periodically transmitted through the PDSCH.
  • the UE needs to receive the information of the neuterology used for the SIB1 transmission and the control resource set (CORESET) information used for the scheduling of the SIB1 through the PBCH.
  • the UE checks scheduling information on SIB1 using SI-RNTI in CORESET and acquires SIB1 on PDSCH according to the scheduling information.
  • the remaining SIBs other than SIB1 may be transmitted periodically or may be transmitted at the request of the terminal.
  • 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 terminal transmits a random access preamble for random access to the base station.
  • the random access preamble is transmitted on the PRACH.
  • the random access preamble is transmitted to the base station through a PRACH composed of consecutive radio resources in a specific slot that is periodically repeated.
  • 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), a UL grant (uplink radio resource), a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier), and a time alignment command (TAC). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to indicate to which UE 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 the valid random access response, the terminal processes the information included in the random access response and performs the scheduled transmission to the base station. For example, the terminal applies a TAC and stores a temporary C-RNTI. In addition, by using the UL Grant, data or newly generated data stored in the buffer of the terminal is transmitted to the base station. In this case, information that can identify the terminal should be included.
  • the terminal receives a downlink message for contention resolution.
  • NR New Radio
  • the present disclosure relates to a radio link control method for lossless transmission in an integrated access and backhaul (IAB) infrastructure using 5G NR wireless communication technology.
  • IAB integrated access and backhaul
  • the present disclosure discloses a retransmission processing operation of a radio layer 2 entity, and describes a processing operation when a radio link failure occurs.
  • relay technology In LTE technology, relay technology has been used for the purpose of extending cell coverage through the use of an additional network node called a relay node (RN).
  • the LTE RN relays user plane data and control plane data at the IP packet level.
  • a service is provided only through a single RN between a donor base station (Denor eNB, DeNB) serving a relay node and a terminal. That is, only relay through a single hop was supported between the UE and the DeNB.
  • DeNB donor base station
  • FIG. 7 is a diagram illustrating an example of a relay-based user plane protocol structure in LTE technology.
  • the terminal 700 communicates with the donor base station 720 through the relay node 710.
  • the donor base station 720 transmits data of the terminal 700 to the gateway 730.
  • the terminal 700 includes an L1 physical layer and an L2 layer, IP, TCP / UDP, App. It is organized in layers.
  • the relay node 710 is connected to the terminal 700 through the L1 and L2 layers, and is connected to the donor base station 720 through the GTP-u layer above the IP layer to transmit and receive data.
  • the relay protocol in LTE technology is configured as shown in FIG.
  • FIG. 8 is a diagram illustrating a relay node start-up procedure in LTE technology.
  • the RN startup procedure of FIGS. 8A and 8B for initiating RN operation is used to configure the necessary parameters for the RN.
  • the RN 800 after the RN 800 is powered on (S805), the RN 800 performs a two-step start procedure.
  • the RN 800 When the RN 800 is powered on, it has two steps because the RN 800 does not know which cell is allowed for network attach. Since not all base stations support serving the RN 800, the RN 800 needs to identify which cell supports the RN 800 operation. If the RN 800 already knows accessible cells, phase I may be omitted and phase II may be performed immediately.
  • Phase I will be described with reference to FIG. 8A.
  • Phase I Attach for RN preconfiguration.
  • the RN 800 connects to the E-UTRAN / EPC as a terminal at power up (S815), and retrieves an initial configuration parameter including a list of DeNB cells from the RN OAM 850 (S825). After the operation S825 is completed, the RN 800 disconnects from the network as a terminal (S835) and triggers Phase II described below.
  • the MME 820 performs S-GW and P-GW 830 selection for the RN 800 as a general terminal.
  • the RN attaches to the E-UTRAN / EPC as a UE at power-up and retrieves initial configuration parameters, including the list of DeNB cells, from RN OAM.After this operation is complete, the RN detaches from the network as a UE and triggers Phase II. The MME performs the S-GW and P-GW selection for the RN as a normal UE.
  • Phase II will be described with reference to FIG. 8 (B).
  • the RN 800 connects to the DeNB 810 selected from the list collected in Phase I to start the relaying operation (S806).
  • RN 800 starts to establish S1 and X2 connections with DeNB 810.
  • the DeNB 810 initiates an RN reconfiguration procedure through RRC signaling for an RN specific parameter (S807).
  • the RN connects to a DeNB selected from the list acquired during Phase I to start relay operations.
  • the DeNB may initiate an RN reconfiguration procedure via RRC signaling for RN-specific parameters.
  • the DeNB 810 performs an S1 eNB configuration update procedure when the configuration data is updated to the RN connection after performing S1 setup with the RN 800 (S808) (S809).
  • the DeNB 810 updates the cell information by performing an X2 eNB configuration update procedure (S812).
  • S1 eNB Configuration Update procedure if the configuration data for the DeNB is updated dueto the RN attach.
  • the DeNB performs the X2 eNB Configuration Update procedure (s) to update the cell information).
  • the RN cells' ECGIs are configured by RN OAM.
  • the RN 800 starts to operate as a relay (S813).
  • the configuration of the relay is mostly provided through a static OAM.
  • the RN acts as a base station, and the RN recognizes the donor base station as a core network entity and forms a terminal context in the RN. Therefore, the RN is configured by indicating most of the configuration through the static OAM, and only the radio configuration (for example, the RN subframe configuration) specific to the entire RN device has been indicated and configured by the decision of the donor base station. Accordingly, when multi-hop is supported between the terminal and the base station (donor base station), it is difficult to efficiently configure the service requirements for each terminal.
  • Next-generation wireless access networks (hereinafter referred to as NR or 5G or NG-RAN for ease of explanation) are distributed with centralized nodes (hereafter referred to as central units (CUs) for ease of explanation) to support efficient network deployment.
  • Nodes hereinafter referred to as DUs (Distributed Units for convenience) may be provided separately. That is, the base station may be configured divided into CU and DU in a logical or physical aspect.
  • the base station is a base station to which the NR technology is applied and may be referred to as gNB to distinguish it from an LTE base station (eNB).
  • gNB LTE base station
  • NR technology may be applied to the base station, the donor base station, and the relay node unless otherwise described below.
  • CU refers to logical nodes hosting RRC, SDAP and PDCP protocols.
  • CU means a logical node hosting RRC and upper layer L2 protocol (PDCP).
  • the CU controls the operation of one or more DUs.
  • the CU terminates the F1 interface associated with the DU (gNB Central Unit (gNB-CU): a logical node hosting RRC, SDAP and PDCP protocols, and controls the operation of one or more gNB-DUs.
  • gNB-CU also terminates F1 interface connected with the gNB-DU.
  • DU means a logical node hosting the RLC, MAC and PHY layers. The operation of the DU is partly controlled by the CU.
  • One DU supports one or a plurality of cells. One cell is supported by only one DU.
  • the DU terminates the F1 interface connected to the CU (gNB Distributed Unit (gNB-DU): a logical node hosting RLC, MAC and PHY layers, and its operation is partly controlled by gNB-CU.
  • gNB-DU gNB Distributed Unit
  • One gNB-DU supportsone or multiplecells
  • One cell is supportedby only one gNB-DU.
  • the gNB-DU terminates F1 interface connected with the gNB-CU.
  • the NG-RAN consists of a set of gNBs connected to the 5GC through the NG.
  • 5GC 5G Core network
  • the base stations may be interconnected through the Xn interface.
  • GNBs can be interconnected through the Xn.
  • a base station may consist of one CU and DUs
  • a gNB may consist of a gNB-CU and gNB-DUs).
  • CU and DU are connected via F1 interface.
  • a gNB-CU and a gNB-DU is connected via F1 logical interface.
  • One DU is connected to only one CU.
  • One gNB-DU is connected to only one gNB-CU).
  • the F1 interface is an interface providing an interconnection between the CU and the DU, and the F1AP (The F1 Application Protocol) is used to provide a signaling procedure on the interface.
  • F1AP The F1 Application Protocol
  • the S1-U interface and X2-C interface for one base station consisting of CU and DU are terminated at the CU (For EN-DC, the S1-U and X2-C interfaces for a gNB). consisting of a gNB-CU and gNB-DUs, terminate in the gNB-CU.)
  • the DU connected to the CU is visible to other base stations and the 5GC as only one base station (The gNB-CU and connected gNB-DUs are only visible to other gNBs and the 5GC as a gNB).
  • NR 5G wireless communication technology
  • the use of relay technology can be increased due to the higher bandwidth and the use of multi-beam systems compared to LTE. This makes it easier for operators to build a dense network of self-backhauled NR cells that provide their own backhaul function.
  • millimeter wave bands can have the disadvantage of experiencing severe short-term blocking.
  • small coverage and beam operations in the millimeter wave band may need to be connected to base stations connected to wired / fiber via multi-hop relays. In this case, the terminal cannot be connected to a base station connected to a wired / optical line by using a relay technology according to the conventional LTE technology.
  • L2-based relay transmission is preferable to L3-based relay transmission such as LTE in order to support low latency data transmission and QoS function.
  • 9 to 13 are diagrams for describing various examples of an L2-based relay structure according to an embodiment.
  • an L2 relay structure as shown in FIGS. 9 to 13 may be considered.
  • the terminal 900 may separately configure an RLC ARQ and an RLC Seg function.
  • the IAB nodes 910 and 915 have only an RLC Seg function, and the RLC ARQ function may be configured in the IAB donor base station 920.
  • the terminal 900 and the IAB donor base station 920 may perform ARQ operation on the data of the RLC entity to ensure transmission and reception of data without missing.
  • the structure must be configured separately from the RLC protocol entity.
  • the IAB nodes 910 and 915 may deliver data on an AM RLC basis. That is, when the terminal 900 transmits data, the IAB node 910 transmits the successful reception of the corresponding data in the RLC entity. When the RLC entity of the terminal 900 receives the successful reception of the data, the RLC entity recognizes that the data has been successfully transmitted. Equally, the IAB node 910 forwards the data to another IAB node 915 and, upon receiving information about the successful receipt of the data at the RLC entity, recognizes that the data has been successfully transmitted.
  • the other IAB node 915 forwards the data to the donor base station 920 and, upon receiving information about successful reception of the data at the RLC entity, recognizes that the data has been successfully transmitted. 10 and 11 show whether the RLC entity is above or below the Adaptation entity, but there is a difference.
  • the IAB node 910 is associated with the CU of the IAB donor base station 920 in the SDAP, PDCP, UDP, GTP-U layer and the like.
  • the CU of the IAB donor base station 920 is connected to the terminal 900 and the PDCP, SDAP layer.
  • the UPF may be associated with the IAB node 910 at the IP layer.
  • the IAB donor base station 920 is not a DU / CU separation structure, but may be a separation structure as described above.
  • the IAB nodes 910 and 915 can deliver data hop by hop in an AM RLC structure.
  • the BAP (Backhaul Adaptation Protocol) object is the same or similar to the Adaptation object described above.
  • an ARQ function may be configured as hop by hop along an access and backhaul link.
  • the PDCP entity of the terminal may receive an indication of confirmation of successful transmission of the previous radio link from the RLC entity, and thus may consider the PDCP SDU transmitted successfully.
  • the ARQ function is configured with hop by hop, if the RLC packet is lost on any next radio link, the transmission of that packet cannot be guaranteed. For example, in the case of PDCP data recovery or PDCP resetting, packets that are recognized as being successfully transmitted are deleted so that retransmission of the corresponding packets cannot be performed and thus packets may be lost.
  • a packet is normally transmitted between the terminal and the IAB node 1 so that the terminal may receive a confirmation thereof.
  • the packet may not be transmitted between the IAB node 1 and the IAB node 2.
  • the packet may not be transmitted between the IAB node 2 and the donor base station.
  • the packet transmitted by the terminal was not eventually delivered to the donor base station, but by the hop-by-hop ARQ operation, the terminal recognizes that the packet is normally transmitted.
  • the present disclosure provides various embodiments for effectively providing lossless data transmission in a layer 2 based relay structure.
  • the donor base station herein refers to a radio network node (or base station or gNB or part of gNB) that terminates an interface to a core network (NG interface (eg, N2, N3 interface)).
  • the donor base station may be physically connected to the core network or another base station through a wired / optical line.
  • the donor base station may configure a backhaul with other NR nodes such as a base station, a CU, a DU, a core network node (AMF, UPF, etc.) using an NR radio technology.
  • the donor base station may be composed of one CU and one or more DUs in the same manner as the NR base station.
  • the donor base station may be replaced with various terms such as IAB-DN, DgNB, DN, and Donor base station.
  • an integrated access and backhaul (IAB) node refers to a node that supports access to a terminal and wireless self-backhauling using NR radio technology.
  • the IAB node may configure backhaul to other NR nodes (IAB-node-MT's next hop neighbor node) and child nodes (IAB-node-DU's next hop neighbor node) using NR radio technology.
  • IAB nodes are not physically connected to other NR nodes via wired / optical lines.
  • the IAB node may be replaced with various terms such as a relay node, an NR-RN, an NR relay, or an integrated node.
  • the description will be given as a relay node or an IAB node.
  • Un interface represents an interface between an IAB node and an IAB node or an interface between an IAB node and a donor base station.
  • the Un interface may be replaced with various terms such as IAB backhaul interface, U-IAB interface, Ui interface, NR Uu interface, and F1 interface.
  • FIG. 14 is a diagram for describing a data retransmission operation of a terminal, according to an exemplary embodiment.
  • a method in which a terminal transmits data through one or more relay nodes may include a packet data convergence protocol (PDCP) entity that provides PDCP data for AM Acknowledged Mode Data Radio Bearer (DRB) through one or more relay nodes. It may include the step of transmitting to the base station (S1400).
  • PDCP packet data convergence protocol
  • DRB AM Acknowledged Mode Data Radio Bearer
  • the terminal may transmit uplink data to the donor base station through the relay node. That is, the PDCP layer delivers the PDCP PDU or SDU to the RLC entity, and the terminal transmits uplink data to the relay node associated with the terminal.
  • the uplink data (ex, PDCP data) is for the AM DRB, ARQ operation for transmission confirmation should be performed.
  • the PDCP entity of the terminal may transmit PDCP data for the AM DRB to the AM RLC entity to perform uplink data transmission.
  • the terminal may receive an acknowledgment of whether the transmission was successful according to the ARQ operation of the AM RLC entity from the relay node (eg, the DU of the relay node) that transmitted the uplink data. If the acknowledgment of the successful transmission is not received or if a response indicating the transmission failure is received, the terminal performs a retransmission operation on the corresponding packet. The retransmission operation may be performed in the AM RLC entity.
  • the relay node directly connected to the terminal through the Uu interface successfully received the terminal data, but may not be associated with the next relay node or the data may not be successfully delivered to the donor base station.
  • the UE has no recognizable method and cannot perform the retransmission operation.
  • the AM RLC entity performs an acknowledgment of successful transmission for a particular packet, and the PDCP entity flushes that packet.
  • the packet is discarded upon expiration of the PDCP Discard timer. Therefore, the packet is lost if the packet is not successfully delivered to the donor base station.
  • the one or more relay nodes may refer to an integrated access and backhaul (IAB) node connected to the terminal through a wireless access and connected between the relay nodes or the donor base station through a wireless backhaul.
  • IAB integrated access and backhaul
  • the present disclosure can receive retransmission indication information as follows.
  • the method of transmitting data through the one or more relay nodes by the terminal may include receiving retransmission indication information indicating PDCP data retransmission from the donor base station (S1410).
  • the retransmission indication information may be included in the PDCP status report.
  • the PDCP status report message itself may function as retransmission indication information.
  • the PDCP status report can be triggered by a specific trigger event.
  • the PDCP status report may be triggered to transmit periodically. That is, the PDCP status report may be transmitted periodically even if a trigger event such as PDCP data recovery or PDCP reset does not occur.
  • the PDCP Status Report message may be triggered and sent in the PDCP entity.
  • the retransmission indication information may be included in a radio resource control (RRC) message.
  • RRC radio resource control
  • the RRC message including the retransmission indication may be triggered by a trigger cause distinct from the PDCP data recovery cause and the PDCP reset cause.
  • the RRC message may indicate retransmission including an information element distinguished from the PDCP data recovery cause and the PDCP reset cause.
  • the RRC message may be set to be transmitted periodically.
  • the transmission of the retransmission indication information may be triggered by various causes.
  • the retransmission indication information may be periodically triggered transmission.
  • the retransmission indication may be triggered when the donor base station detects a backhaul link failure for one or more relay nodes.
  • retransmission indication information may be triggered in response to a data transmission path change event.
  • the relay node may transmit backhaul link detection information to another relay node associated with the relay node.
  • the relay node may transmit backhaul failure detection information to the donor base station.
  • the method of transmitting data through the one or more relay nodes by the terminal may include retransmitting a PDCP data protocol data unit (PDU) or service data unit (SDU) in the PDCP entity based on the retransmission indication information (S1420). .
  • PDU PDCP data protocol data unit
  • SDU service data unit
  • the terminal selects and retransmits the PDCP data PDU or SDU requiring retransmission using the retransmission indication information.
  • the retransmitted PDCP data PDUs or SDUs may include PDCP data PDUs or SDUs whose delivery has been confirmed by a Radio Link Control (RLC) entity of the UE. That is, although successful transmission is confirmed according to the ARQ operation of the RLC entity, retransmission may be performed for the PDCP data PDU or SDU for which retransmission is indicated. For example, retransmission may be made for all PDCP data PDUs or SDUs previously sent to the corresponding AM RLC entity (the card timer has not expired). For another example, retransmission may be made for all PDCP data PDUs or SDUs stored within the transmitting PDCP entity.
  • RLC Radio Link Control
  • the retransmitted PDCP data PDU or SDU may include only PDCP data PDUs or SDUs whose delivery has not been confirmed by the PDCP status report message.
  • retransmission indication information is indicated by the PDCP status report message.
  • the terminal may check data not normally delivered to the donor base station by the corresponding PDCP status report information, and may retransmit only the PDCP data PDU or SDU of the corresponding data.
  • the retransmitted PDCP data PDU or SDU may include the entire PDCP data PDU or SDU indicated by the PDCP status report message or RRC message.
  • the terminal can perform a reliable data transmission operation without packet loss to the donor base station through a plurality of multi-hop relay node.
  • FIG. 15 illustrates a data retransmission operation of a donor base station according to an embodiment.
  • a Packet Data Convergence Protocol (PDCP) entity may transmit PDCP data for AM DRB (Acknowledged Mode Data Radio Bearer) to one or more relay nodes. It may include transmitting to the terminal through (S1500).
  • PDCP Packet Data Convergence Protocol
  • the donor base station may transmit downlink data to the terminal through the relay node. That is, the PDCP layer delivers the PDCP PDU or SDU to the RLC entity, and the donor base station transmits downlink data to the relay node associated with the donor base station.
  • the downlink data (ex, PDCP data) is for the AM DRB, the ARQ operation for transmission confirmation should be performed.
  • the PDCP entity of the donor base station may perform downlink data transmission by transferring PDCP data for the AM DRB to the AM RLC entity.
  • the one or more relay nodes may refer to an integrated access and backhaul (IAB) node connected to the terminal through a wireless access and connected between the relay nodes or the donor base station through a wireless backhaul.
  • IAB integrated access and backhaul
  • the method of transmitting data through the one or more relay nodes by the donor base station may include receiving retransmission indication information indicating PDCP data retransmission from the terminal (S1510).
  • the retransmission indication information may be included in the PDCP status report.
  • the PDCP status report message itself may function as retransmission indication information.
  • the PDCP status report can be triggered by a specific trigger event.
  • the PDCP status report may be triggered to transmit periodically. That is, the PDCP status report may be transmitted periodically even if a trigger event such as PDCP data recovery or PDCP reset does not occur.
  • the PDCP Status Report message may be triggered and sent in the PDCP entity.
  • the retransmission indication information may be included in a radio resource control (RRC) message.
  • RRC radio resource control
  • the RRC message including the retransmission indication may be triggered by a trigger cause distinct from the PDCP data recovery cause and the PDCP reset cause.
  • the RRC message may indicate retransmission including an information element distinguished from the PDCP data recovery cause and the PDCP reset cause.
  • the RRC message may be set to be transmitted periodically.
  • the transmission of the retransmission indication information may be triggered by various causes.
  • the retransmission indication information may be periodically triggered transmission.
  • the retransmission indication may be triggered when the donor base station detects a backhaul link failure for one or more relay nodes.
  • retransmission indication information may be triggered in response to a data transmission path change event.
  • the relay node may transmit backhaul link detection information to another relay node associated with the relay node.
  • the relay node may transmit backhaul failure detection information to the donor base station.
  • the method of transmitting data through the one or more relay nodes by the donor base station may include retransmitting a PDCP data protocol data unit (PDU) or service data unit (SDU) in the PDCP entity based on the retransmission indication information (S1520). ).
  • PDU PDCP data protocol data unit
  • SDU service data unit
  • the donor base station selects and retransmits PDCP data PDUs or SDUs requiring retransmission using the retransmission indication information.
  • the retransmitted PDCP data PDUs or SDUs may include PDCP data PDUs or SDUs whose delivery is confirmed in a Radio Link Control (RLC) entity of the donor base station. That is, although successful transmission is confirmed according to the ARQ operation of the RLC entity, retransmission may be performed for the PDCP data PDU or SDU for which retransmission is indicated. For example, retransmission may be made for all PDCP data PDUs or SDUs previously sent to the corresponding AM RLC entity (the card timer has not expired). For another example, retransmission may be made for all PDCP data PDUs or SDUs stored within the transmitting PDCP entity.
  • RLC Radio Link Control
  • the retransmitted PDCP data PDU or SDU may include only PDCP data PDUs or SDUs whose delivery has not been confirmed by the PDCP status report message.
  • retransmission indication information is indicated by the PDCP status report message.
  • the donor base station may check data not normally delivered to the terminal by the corresponding PDCP status report information, and may retransmit only PDCP data PDU or SDU of the corresponding data.
  • the retransmitted PDCP data PDU or SDU may include the entire PDCP data PDU or SDU indicated by the PDCP status report message or RRC message.
  • the donor base station can also perform a reliable data transmission operation without packet loss to the terminal through a plurality of multi-hop relay node.
  • the above-described relay non-node may be described as an IAB node, and the base station may mean a donor base station.
  • the base station may mean a donor base station.
  • each embodiment is described based on downlink or uplink transmission for convenience of description, it may be applied to both uplink and downlink data transmission.
  • the following methods may be used individually or in combination / combination.
  • the PDCP entity reports the PDCP status report when it requests a PDCP object reset at the higher layer or when the upper layer requests PDCP data recovery. Had to trigger. For example, an RRC connection reconfiguration message provided (temporarily) PDCP status reporting only if the radio bearer was modified / reconfigured / changed. (For AM DRBs configured by upper layers to send a PDCP status report in the uplink, the receiving PDCP entity shall trigger a PDCP status report when:
  • a PDCP status report may be transmitted by a receiving PDCP entity between a terminal and a donor base station for a radio bearer requiring lossless data transmission. Based on this, data retransmission can be continued in the transmitting PDCP entity to perform lossless data transmission.
  • the terminal when the terminal is connected to the donor base station through one or more IAB nodes, configures an AM RLC entity on each radio link for radio bearers requiring lossless data transmission, and an RLC ARQ operation on each radio link. Performing can cause significant delays. And confirmation of successful transmission of the corresponding radio link by the AM RLC status report in each radio link may not guarantee successful transmission of the corresponding data in the end-to-end radio link.
  • a method of providing an ARQ end-to-end by configuring an RLC ARQ entity in a terminal and a donor base station has a problem of complicating an existing RLC protocol to distinguish and operate an RLC protocol entity.
  • the donor base station can control the terminal to trigger status reporting in uplink (or in a PDCP receiving entity between the donor base station and the terminal) even when the above-described conventional trigger condition does not occur for the radio bearer.
  • the donor base station may configure the terminal with indication information for PDCP status reporting of the terminal.
  • the donor base station may configure one or more information elements below or an information element for a function described below or a combination thereof through the RRC connection reconfiguration message in the terminal.
  • a period for periodic PDCP status reporting (for example, PDCP status report Periodicity) may be indicated to the terminal.
  • This may include a PDCP status reporting period value at which the UE triggers PDCP status report / reporting / PDU for the corresponding radio bearer.
  • the period information may be configured for a radio data bearer configured through the IAB.
  • indication information for PDCP status PDU polling may be transmitted to the terminal.
  • the terminal may instruct to compile and send a PDCP status report.
  • a pollPDU or pollByte value for indicating that the UE includes a poll / polbit in the PDCP PDU may be indicated for the corresponding radio bearer.
  • pollPDU represents a parameter used by the sending PDCP entity to trigger a poll for each PDU of every pollPDU.
  • pollByte represents a parameter used by the sending PDCP object to trigger a poll for every byte of pollByte.
  • a terminal or donor base station on the PDCP data PDU format may include a 1-bit field for indicating polling when the PDCP status report triggers.
  • FIG. 16 is a diagram illustrating a PDCP data PDU format according to an embodiment.
  • one of three R fields shown in FIG. 16 may be used as a field for polling. This may be configured only for the radio data bearer configured through the IAB.
  • the method for the UE to add the polling bit to the PDCP data PDU in the transmitting PDCP entity and transmit it will be described later.
  • Triggering enable indication of status reporting operation by polling and / or polling (or PDCP status reporting enable / disable indication);
  • instructing enable (or disable) of a PDCP status reporting operation and / or a terminal polling operation according to PDCP status report polling Instruction information for the terminal may be configured. This may only be configured for radio data bearers configured via IAB.
  • the donor base station may configure the terminal with indication information for instructing the terminal to continuously send polling and / or PDCP status reporting to the radio bearer.
  • the base station may send indication information for instructing the terminal to send a PDCP status report periodically or by polling of the base station. This may be configured only for the radio data bearer configured through the IAB.
  • the donor base station when the terminal receives PDCP status reporting for the radio bearer, information for instructing the PDCP entity of the terminal to retransmit unreceived or unreceived PDCP PDUs (or SDUs) by the donor base station.
  • the retransmitted PDCP data PDUs or SDUs may include PDCP data PDUs or SDUs whose delivery is confirmed in a Radio Link Control (RLC) entity of the terminal.
  • RLC Radio Link Control
  • This may be configured only for the radio data bearer configured through the IAB.
  • the terminal compiles the PDCP status report by at least one of the various methods.
  • the terminal compiles the PDCP status report as follows.
  • the PDCP status report can be triggered via an RRC message or any PDCP control PDU.
  • the terminal sets the FMC field to the RX_DELIVE value.
  • FMC represents the first missing COUNT value
  • RX_DELIV represents the COUNT value of the first PDCP SDU that was not delivered to the upper layer.
  • This state variable indicates the COUNT value of the first PDCP SDU not delivered to the upper layers, but still waited for. The initial value is 0.
  • RX_DELIV ⁇ RX_NEXT
  • RX_DELIV allocate a bitmap field of the same bit length as the number of COUNTs up to and including PDCP SDUs that do not contain the first lost PDCP SDU and out of the last order. bits equal to the number of COUNTs from and not including the first missing PDCP SDU up to and including the last out-of-sequence PDCP SDUs, rounded up to the next multiple of 8, or up to and including a PDCP SDU for which the resulting PDCP Control PDU size is equal to 9000 bytes, whichever comes first)
  • RX_NEXT represents the COUNT value of the next PDCP SDU expected to be received. (This state variable indicates the COUNT value of the next PDCP SDU expected to be received. The initial value is 0.)
  • the terminal compiles and transmits a PDCP status report.
  • a period for triggering a PDCP status report is configured, and if a timer for triggering periodic PDCP status reporting is running, the terminal stops the timer.
  • the UE starts a timer for triggering PDCP status reporting with a period value that triggers the received PDCP status reporting.
  • the terminal compiles and transmits a PDCP status report.
  • the UE starts a timer for triggering PDCP status reporting with a period value that triggers a PDCP status report.
  • the transmitting PDCP entity of the terminal polls the PDCP data PDU.
  • Information for instructing to set may be instructed to the terminal.
  • the information indicated to the terminal may include a pollPDU or pollByte value for indicating that the terminal includes a poll / polbit in the PDCP PDU for the corresponding radio bearer.
  • pollPDU represents a parameter used by the sending PDCP entity to trigger a poll for each PDU of every pollPDU.
  • pollByte represents a parameter used by the sending PDCP object to trigger a poll for every byte of pollByte.
  • the terminal or the donor base station on the PDPC data PDU format may include a 1-bit field for indicating polling when the PDCP status report triggers.
  • the state variables needed to set the polling bit in the transmitting PDCP entity of the terminal are PDUs without poll (PDU_WITHOUT_POLL, hereinafter referred to as PWP for convenience of explanation) and / or pollless bytes (BYTE_WITHOUT_POLL, BWP hereinafter for convenience of explanation). It is necessary to define.
  • PWP is a count of the number of PDUs since the most recent poll bit was transmitted, initially set to zero.
  • the BWP is a count of the number of data bytes since the most recent poll bit was sent, and this value is initially set to zero.
  • the sending PDCP entity increments the PWP by one.
  • the sending PDCP entity increments the BWP by every new byte of the data field element that maps to the data field of the PDCP PDU (or PDCP SDU).
  • the transmitting PDCP entity for each PDCP SDU, If present, the bit set to "1" in the bitmap or associated COUNT value less than the value of the FMC field is considered successful.
  • the PDCP SDU is discarded.
  • the transmitting PDCP entity for each PDCP SDU If present, the bit set to "0" in the bitmap is considered unsuccessful (or missing or PDCP SDU / PDU required to retransmit). The PDCP SDU is retransmitted. This may be done in ascending order of the associated COUNT value.
  • PDCP status reports and PDCP data retransmission by persistent or any new trigger may be provided without resetting the PDCP entity. Therefore, retransmission for the PDCP PDU may be performed instead of retransmission for the PDCP SDU.
  • the transmitting PDCP entity for each PDCP SDU, If present, the bit set to "0" in the bitmap is considered unsuccessful (or lost or PDCP SDU / PDU required to retransmit). The PDCP PDU is then retransmitted. This may be done in ascending order of the associated COUNT value.
  • the transmitting PDCP entity for each PDCP PDU, If present, the bit set to "0" in the bitmap is considered to be unsuccessful (or lost or PDCP SDU / PDU required to be retransmitted). The PDCP PDU is then retransmitted. This may be done in ascending order of the associated COUNT value.
  • the PDCP status report and PDCP data retransmission by persistent or any new trigger may be provided in a different way than the recovery procedure of the PDCP entity.
  • the retransmitted PDCP data PDUs or SDUs may include PDCP data PDUs or SDUs whose delivery is confirmed by a Radio Link Control (RLC) entity of the UE. That is, although successful transmission is confirmed according to the ARQ operation of the RLC entity, retransmission may be performed for the PDCP data PDU or SDU for which retransmission is indicated. For example, retransmission may be made for all PDCP data PDUs or SDUs previously sent to the corresponding AM RLC entity (the card timer has not expired). For another example, retransmission may be made for all PDCP data PDUs or SDUs stored within the transmitting PDCP entity.
  • RLC Radio Link Control
  • information for indicating such PDCP retransmission may be configured in the terminal through an RRC message.
  • the retransmission indication information may indicate an information element distinguished from a conventional PDCP data recovery cause and a PDCP reset cause.
  • the indication information for triggering such PDCP retransmission may be indicated through any PDCP control PDU separated from the PDCP status report.
  • the indication information for triggering such PDCP retransmission may be indicated through an RRC message.
  • the transmission of the retransmission indication information may be triggered by various causes.
  • the retransmission indication information may be periodically triggered transmission.
  • the retransmission indication may be triggered when the donor base station detects a backhaul link failure for one or more relay nodes.
  • retransmission indication information may be triggered in response to a data transmission path change event.
  • an RLC session / channel / bearer may be configured on each radio link between the terminal and the IAB node, between the IAB node and the IAB node, and between the IAB node and the donor base station.
  • RLC sessions / channels / bearers may be configured on each radio link in the various relay structures described above.
  • the donor base station may transmit information for configuring a peering RLC entity to the terminal.
  • an IAB node close to the donor base station may indicate information for configuring a peering RLC entity on another IAB node forming a radio link with the corresponding IAB node.
  • performing the ARQ operation on each radio link as described above may be an inefficient operation.
  • the RLC entity may be configured to simply operate on one or more radio links of each radio link between the terminal and the IAB node, between the IAB node and the IAB node, and between the IAB node and the donor base station.
  • a radio link may be configured as a UM RLC entity to perform a UM RLC operation on a radio link for a corresponding radio bearer.
  • 17 illustrates a peering model of a UM RLC entity.
  • the UM RLC entity may perform simple operation in a radio link by submitting / receiving RLC PDUs through a DL DTCH or UL DTCH logical channel and performing only segmentation operation when necessary without an ARQ operation.
  • information for instructing the radio bearer to disable ARQ operation for the AM RLC entity on the radio link may be configured. This allows the transmitting side of an AM RLC entity not to perform retransmission of RLC SDUs or RLC SDU segments. And / or through this, the receiving side of an AM RLC entity may not trigger a status report.
  • the radio bearer may be configured not to indicate to the upper layer an acknowledgment message for successful transmission on the radio link.
  • an ARQ may be provided end-to-end by configuring an RLC ARQ entity between the UE and the donor base station.
  • an RLC protocol entity must be separately configured in such a structure.
  • service interruption is detected by detecting a radio link failure and transitioning to an RRC IDLE state or executing an RRC Connection Re-establishment procedure accordingly. Can be generated.
  • the radio state between the radio link between the terminal and the first hop IAB node may be stable. Therefore, in this case, changing the state of the terminal to the RRC Idle state, or performing the RRC connection reset operation will cause unnecessary operation of the terminal.
  • the UE in the RRC connection state detects RLF (Radio Link Failure) in the following cases.
  • RLF Radio Link Failure
  • the terminal detects / considers a radio link failure for the MCG.
  • the RLF information is stored in the VarRLF-Report. If AS security is not activated, the terminal leaves the RRC Connected state. That is, move to RRC IDLE state. Otherwise, if AS security is activated, perform the RRC Connection Re-establishment procedure.
  • the present disclosure provides a method and apparatus for effectively handling an RLC retransmission failure.
  • First embodiment a method of configuring an RLC retransmission count to an infinite value
  • the donor base station may instruct the terminal to information for configuring an RLC entity peered to the RLC entity of the donor base station.
  • the IAB node close to the donor base station may instruct the terminal to information for configuring an RLC entity peered with the corresponding IAB node.
  • FIG. 18 is a diagram illustrating AM RLC configuration information according to an embodiment.
  • the conventional uplink AM RLC configuration information may be configured as shown in FIG. 18.
  • the corresponding AM RLC configuration information may be indicated to the terminal.
  • maxRetxThreshold represents the maximum retransmission threshold of the RLC. In the prior art, a value from 1 to 32 was applicable. Therefore, it is possible to change the maximum retransmission threshold so that no radio link failure occurs.
  • the terminal may not detect a radio link failure in the corresponding RLC entity. As a result, it is not necessary to perform an inefficient operation that is caused later. Problems on each radio link can be solved by other alternatives, such as RLF detection at the physical layer of the radio link. Alternatively, if a problem is found on each radio link, the connection can be resumed, for example, with relay path switching.
  • the current maximum retransmission threshold is not a value that can be selectively configured, but is a value that must be configured in the terminal. If the information element is changed to a configurable value selectively and the information element is not configured, the radio link failure may not be detected.
  • the upper layer transmits an RRC message including a cause thereof to the donor base station without resetting the RRC connection in the RRC connected state.
  • the terminal RLC entity when the maximum retransmission threshold is reached in the terminal RLC entity peered to the RLC entity of the donor base station, the terminal RLC entity delivers it to the RRC layer. For example, if the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold), the terminal RLC entity indicates that the maximum retransmission has been reached to the higher layer (RRC).
  • the maximum retransmission threshold value maxRetxThreshold
  • the terminal RLC entity forwards it to the RRC layer. For example, the terminal RLC entity indicates that the maximum retransmission has been reached to the higher layer (RRC) if the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold).
  • the RRC entity may allow the RRC connection to transmit / report an RRC message including cause information to the donor base station without resetting the RRC connection.
  • the RRC message may be transmitted through an SCG failure information message or a UL Information transfer message or a UE Information message or any uplink RRC message.
  • the cause information included in this case indicates new failure cause type information that is distinguished from existing wireless failure cause types.
  • the conventional radio failure type includes information indicating failure due to reaching a maximum number of retransmissions on a logical channel mapped to SCell for CA redundant transmission (for example, SCell-RLF) and information indicating a radio link failure of a secondary cell group ( For example, SCG-RLF), information to initiate transmission of SCG failure information messages (e.g.
  • scg-ChangeFailure to provide reconfiguration with synchronous failure information for the secondary cell group, SCG failure due to SRB3 IP check failurefh Information for initiating transmission of the information message (for example, srb3-IntegrityFailure), information for initiating transmission of the SCG failure information message due to SCG reconfiguration failure (for example, scg-reconfigFailure), and the like.
  • the radio link failure cause type according to the present embodiment may have a value of a newly defined cause type distinguished from the existing cause type. This allows the operator to identify those failures and pinpoint exactly what caused the failure.
  • the above-described RRC message transmitted to the donor base station by the terminal may include additional information on the IAB connection in addition to the above-described cause information.
  • the terminal may store additional information regarding the corresponding radio link failure in the VarRLF-Report information. Then, the VarRLF-Report information may be transmitted to the base station through a normal RRC procedure (for example, UE information response message) to the base station.
  • a normal RRC procedure for example, UE information response message
  • the additional information described above may include IAB node path information, IAB donor address, IAB node address, root ID, IAB node identifier information, cell identifier information provided by the IAB node, measurement results in the last serving cell including RSRP and RSRQ, and corresponding radio. It may include one or more of bearer identifier information and IAB node path information of the radio bearer.
  • the IAB node path information is information to identify when there are multiple paths for data transfer with the IAB node between the IAB node and the IAB donor base station (or between the source IAB node and the destination IAB node). Included in the header may be used to distinguish the path when transmitting data to the destination IAB node or IAB donor base station.
  • the additional information may be included and stored in the VarRLF report even when performing the RLF operation as in the conventional operation.
  • any IAB node may include that additional information when it detects an RLF.
  • the terminal RLC entity when the maximum retransmission threshold is reached in the terminal RLC entity peered to the RLC entity of the donor base station, the terminal RLC entity delivers it to the RRC layer. For example, if the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold), the terminal RLC entity indicates that the maximum retransmission has been reached to the higher layer (RRC).
  • the maximum retransmission threshold value maxRetxThreshold
  • the terminal RLC entity when the maximum retransmission threshold is reached in the terminal RLC entity peered to the RLC entity of the IAB node close to the donor base station, the terminal RLC entity delivers it to the RRC layer. For example, if the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold), the terminal RLC entity indicates that the maximum retransmission has been reached to the higher layer (RRC).
  • the maximum retransmission threshold value maxRetxThreshold
  • the RRC entity Upon receiving the above-mentioned indication from the terminal RLC entity, the RRC entity suspends the radio bearer. Alternatively, the RRC entity suspends all SRB (s) and DRB (s) provided through the cell / cell group of the corresponding IAB node except SRB0.
  • the adjacent IAB node means a node located within a predetermined number of hops with a specific IAB node.
  • the terminal RLC entity when the maximum retransmission threshold is reached in the terminal RLC entity peered to the RLC entity of the donor base station, the terminal RLC entity delivers it to the RRC layer. For example, if the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold), the terminal RLC entity indicates that the maximum retransmission has been reached to the higher layer (RRC).
  • the maximum retransmission threshold value maxRetxThreshold
  • the terminal RLC entity forwards it to the RRC.
  • the UE RLC entity If the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold), it indicates that the maximum retransmission has been reached to the higher layer (RRC).
  • the RLC entity forwards it to the RRC. For example, the RLC entity If the retransmission count is equal to the maximum retransmission threshold value (maxRetxThreshold), it indicates that the maximum retransmission has been reached to the upper layer (RRC).
  • the maximum retransmission threshold value maxRetxThreshold
  • the terminal may wish to inform the IAB node (the IAB node receiving the terminal) that is wirelessly connected to the first hop that there is a problem on any radio link connected between the terminal and the donor base station. Or, it may want to inform the adjacent IAB node (child node or parent node) that there is a problem on the backhaul radio link associated with the IAB node. This allows the IAB node of the first hop adjacent to itself to resolve problems on the radio link with the IAB node of the next hop or to attempt to connect to the donor base station via another path. Alternatively, an IAB node of an adjacent first hop can be delivered to the IAB node of the next hop even if there is no problem on the radio link with the IAB node of the next hop.
  • the problem can be resolved by checking the path for each hop and changing the path. Therefore, the unnecessary terminal or the IAB node MT may not enter the RRC IDLE state or the RRC connection resetting operation. For example, such a problem may not occur when the dual connectivity-based multipath is set between the terminal and the donor base station. In another example, when a dual connectivity-based multipath is established between an IAB node and a donor base station, this problem may not occur.
  • control information for indicating this between the UE and the IAB node of the first radio hop or between the IAB node and the IAB node of the next radio hop or between the IAB node and the IAB donor base station of the next radio hop.
  • the information may be transmitted through one of the following methods.
  • the terminal, the IAB node, and the IAB donor base station all have MAC entities. Therefore, the control information can be delivered to the next hop in the corresponding radio link through the MAC control element.
  • a node that receives the MAC CE by allocating an LCID for this may transmit it to the RRC.
  • the RRC may trigger a path change to the donor base station.
  • the MAC CE may include one or more of the above-described cause information and additional information.
  • the MAC CE may be transmitted through a secondary path in which no RLF is generated.
  • the terminal, the IAB node, and the IAB donor base station all have RLC entities. Therefore, the control information can be delivered to the next hop in the corresponding radio link through the RLC Control PDU.
  • An IAB node that receives a corresponding RLC control PDU by assigning a Control PDU Type (CPT) field value for this may transmit it to the RRC.
  • the RRC may trigger a path change to the donor base station.
  • the RLC control PDU may include one or more of the above-described cause information and additional information.
  • the RLC control PDU may be transmitted through a secondary path in which no RLF is generated.
  • Both the IAB node and the IAB donor base station have adaptation objects. Therefore, the control information can be delivered to the next hop in the corresponding radio link through the adaptation control PDU.
  • a node that receives a corresponding adaptation control PDU by assigning a Control PDU Type (CPT) field value for this may transmit it to the RRC.
  • the RRC may trigger a path change to the donor base station.
  • the adaptation control PDU may include one or more of the above-described cause information and additional information.
  • the adaptation control PDU may be transmitted through a secondary path in which no RLF is generated.
  • the present disclosure provides an effect that when the terminal is configured through a multi-hop relay, the terminal can efficiently handle the occurrence of the RLC failure to transmit and receive data.
  • 19 is a block diagram illustrating a terminal configuration according to an embodiment.
  • a terminal 1900 for transmitting data through one or more relay nodes may include a packet data convergence protocol (PDCP) entity that transmits PDCP data for an AM Acknowledged Mode Data Radio Bearer (DRDR) to one or more relay nodes.
  • the PDCP data protocol data unit (PDU) or SDU in the PDCP entity based on the transmitter 1920 transmitting the donor base station through the donor base station, the receiver 1930 receiving the retransmission indication information indicating the retransmission of the PDCP data from the donor base station, and the retransmission indication information.
  • It may include a control unit 1910 for controlling to retransmit (Service Data Unit).
  • the transmitter 1920 may transmit uplink data to the donor base station through the relay node. That is, the PDCP layer delivers the PDCP PDU or SDU to the RLC entity, and the transmitter 1920 transmits uplink data to the relay node associated with the terminal.
  • the uplink data (ex, PDCP data) is for the AM DRB, ARQ operation for transmission confirmation should be performed.
  • the PDCP entity of the terminal 1900 may perform uplink data transmission by transferring PDCP data for the AM DRB to the AM RLC entity.
  • One or more relay nodes may refer to an integrated access and backhaul (IAB) node connected to the terminal 1900 through wireless access and connected between relay nodes or a donor base station through a wireless backhaul.
  • IAB integrated access and backhaul
  • the retransmission indication information may be included in the PDCP status report.
  • the PDCP status report message itself may function as retransmission indication information.
  • the PDCP status report can be triggered by a specific trigger event.
  • the PDCP status report may be triggered to transmit periodically. That is, the PDCP status report may be transmitted periodically even if a trigger event such as PDCP data recovery or PDCP reset does not occur.
  • the PDCP Status Report message may be triggered and sent in the PDCP entity.
  • the retransmission indication information may be included in a radio resource control (RRC) message.
  • RRC radio resource control
  • the RRC message including the retransmission indication may be triggered by a trigger cause distinct from the PDCP data recovery cause and the PDCP reset cause. That is, the RRC message may be set to be transmitted periodically.
  • the transmission of the retransmission indication information may be triggered by various causes.
  • the retransmission indication information may be periodically triggered transmission.
  • the retransmission indication may be triggered when the donor base station detects a backhaul link failure for one or more relay nodes.
  • retransmission indication information may be triggered in response to a data transmission path change event.
  • the relay node may transmit backhaul link detection information to another relay node associated with the relay node.
  • the relay node may transmit backhaul failure detection information to the donor base station.
  • the transmitter 1920 selects and retransmits PDCP data PDUs or SDUs requiring retransmission using the retransmission instruction information.
  • the retransmitted PDCP data PDUs or SDUs may include PDCP data PDUs or SDUs whose delivery has been confirmed by a Radio Link Control (RLC) entity of the UE. That is, although successful transmission is confirmed according to the ARQ operation of the RLC entity, retransmission may be performed for the PDCP data PDU or SDU for which retransmission is indicated.
  • RLC Radio Link Control
  • the retransmitted PDCP data PDU or SDU may include only PDCP data PDUs or SDUs whose delivery has not been confirmed by the PDCP status report message.
  • retransmission indication information is indicated by the PDCP status report message.
  • the controller 1910 may check data not normally delivered to the donor base station by the corresponding PDCP status report information, and control to retransmit only the PDCP data PDU or SDU of the corresponding data.
  • the retransmitted PDCP data PDU or SDU may include the entire PDCP data PDU or SDU indicated by the PDCP status report message or RRC message.
  • controller 1910 controls the overall operation of the terminal 1900 according to the above-described retransmission operation and RLF detection and processing operation of the PDCP data PDU or SDU according to the present disclosure.
  • the transmitter 1920 and the receiver 1930 are used to transmit and receive a signal, a message, and data necessary for performing the above-described embodiment with a donor base station, a relay node, or another terminal.
  • 20 is a block diagram illustrating a donor base station configuration according to an embodiment.
  • a donor base station 2000 that transmits data through one or more relay nodes may include one or more relay nodes for PDCP data for an AM DRB (Acknowledged Mode Data Radio Bearer) by a Packet Data Convergence Protocol (PDCP) entity.
  • a PDCP data protocol data unit (PDU) or SDU (PDDU) in the PDCP entity based on the transmitter 2020 for transmitting to the terminal through the receiver 2020 and the receiver 2030 for receiving retransmission instruction information indicating retransmission of the PDCP data from the terminal and the retransmission instruction information;
  • a control unit 2010 for controlling retransmission of the service data unit.
  • the transmitter 2020 may transmit downlink data to the terminal through the relay node. That is, the PDCP layer delivers the PDCP PDU or SDU to the RLC entity, and the transmitter 2020 transmits downlink data to the relay node associated with the donor base station.
  • the downlink data (ex, PDCP data) is for the AM DRB, the ARQ operation for transmission confirmation should be performed.
  • the donor base station 2000 may transmit the downlink data by transmitting the PDCP data for the AM DRB to the AM RLC entity.
  • the one or more relay nodes may refer to an integrated access and backhaul (IAB) node that is connected to the terminal through a wireless access and is connected between the relay nodes or the donor base station 2000 with a wireless backhaul.
  • IAB integrated access and backhaul
  • the retransmission indication information may be included in the PDCP status report.
  • the PDCP status report message itself may function as retransmission indication information.
  • the PDCP status report can be triggered by a specific trigger event.
  • the PDCP status report may be triggered to transmit periodically. That is, the PDCP status report may be transmitted periodically even if a trigger event such as PDCP data recovery or PDCP reset does not occur.
  • the PDCP Status Report message may be triggered and sent in the PDCP entity.
  • the retransmission indication information may be included in a radio resource control (RRC) message.
  • RRC radio resource control
  • the RRC message including the retransmission indication may be triggered by a trigger cause distinct from the PDCP data recovery cause and the PDCP reset cause. That is, the RRC message may be set to be transmitted periodically.
  • the transmission of the retransmission indication information may be triggered by various causes.
  • the retransmission indication information may be periodically triggered transmission.
  • the retransmission indication information may be triggered when the control unit 2010 detects a backhaul link failure for one or more relay nodes.
  • retransmission indication information may be triggered in response to a data transmission path change event.
  • the relay node may transmit backhaul link detection information to another relay node associated with the relay node.
  • the relay node may transmit backhaul link detection information to the donor base station 2000.
  • the controller 2010 may control to retransmit the PDCP data PDU or SDU that needs retransmission by using the retransmission indication information.
  • the retransmitted PDCP data PDUs or SDUs may include PDCP data PDUs or SDUs that are confirmed to be delivered in a Radio Link Control (RLC) entity of the donor base station 2000. That is, although successful transmission is confirmed according to the ARQ operation of the RLC entity, retransmission may be performed for the PDCP data PDU or SDU for which retransmission is indicated.
  • RLC Radio Link Control
  • the retransmitted PDCP data PDU or SDU may include only PDCP data PDUs or SDUs whose delivery has not been confirmed by the PDCP status report message.
  • retransmission indication information is indicated by the PDCP status report message.
  • the controller 2010 may check data not normally delivered to the terminal by the corresponding PDCP status report information, and control to retransmit only PDCP data PDU or SDU of the corresponding data.
  • the retransmitted PDCP data PDU or SDU may include the entire PDCP data PDU or SDU indicated by the PDCP status report message or RRC message.
  • control unit 2000 controls the overall operation of the donor base station 2000 according to the retransmission operation of the PDCP data PDU or SDU and the RLF detection and the processing operation according to the aforementioned disclosure.
  • the transmitter 2020 and the receiver 2030 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiment with a terminal, a relay node, or another base station.
  • the above-described embodiments may be implemented through various means.
  • the embodiments may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to the embodiments may include 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 may be implemented.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • a processor a controller, a microcontroller or a microprocessor may be implemented.
  • the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function for performing the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • system generally refer to computer-related entity hardware, hardware and software.
  • the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, an execution thread, a program, and / or a computer.
  • an application running on a controller or processor and a controller or processor can be components.
  • One or more components may be within a process and / or thread of execution, and the components may be located on one device (eg, system, computing device, etc.) or distributed across two or more devices.

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

Abstract

La présente invention se rapporte à des techniques de traitement de données et de retransmission de données via un nœud relais. Dans un mode de réalisation, l'invention concerne un procédé permettant à un terminal de transmettre des données via au moins un nœud relais. L'invention concerne également un appareil associé. Le procédé comprend : une étape au cours de laquelle une entité de protocole de convergence de données par paquets (PDCP) transmet des données PDCP pour un support radio de données en mode accusé de réception (AMDRB), à une station de base donneuse, via au moins un nœud relais ; une étape au cours de laquelle l'entité PDCP reçoit, de la station de base donneuse, des informations de commande de retransmission qui commandent à l'entité PDCP de retransmettre les données PDCP ; et une étape au cours de laquelle l'entité PDCP retransmet, sur la base des informations de commande de retransmission, une unité de données de protocole (PDU) de données PDCP ou une unité de données de service (SDU) de données PDCP.
PCT/KR2019/005251 2018-05-03 2019-05-02 Procédé de traitement de données via un nœud relais, et appareil associé WO2019212249A1 (fr)

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KR1020190050268A KR20190127561A (ko) 2018-05-03 2019-04-30 릴레이 노드를 통한 데이터 처리 방법 및 그 장치

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