WO2023008897A1 - Procédé et appareil pour établir des ressources de connectivité double d'un nœud iab dans un système de communication sans fil - Google Patents

Procédé et appareil pour établir des ressources de connectivité double d'un nœud iab dans un système de communication sans fil Download PDF

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WO2023008897A1
WO2023008897A1 PCT/KR2022/011011 KR2022011011W WO2023008897A1 WO 2023008897 A1 WO2023008897 A1 WO 2023008897A1 KR 2022011011 W KR2022011011 W KR 2022011011W WO 2023008897 A1 WO2023008897 A1 WO 2023008897A1
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iab node
parent
node
multiplexing
radio resource
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PCT/KR2022/011011
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English (en)
Korean (ko)
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최승훈
류현석
여정호
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삼성전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present disclosure relates to a wireless communication system, and more specifically, to a method and apparatus for configuring resources in dual connectivity of an integrated access and backhaul (IAB) node.
  • IAB integrated access and backhaul
  • the 5G communication system or pre-5G communication system is being called a Beyond 4G Network communication system or a Post LTE system.
  • the 5G communication system is being considered for implementation in a mmWave band (eg, a 60 gigabyte (60 GHz) band).
  • a mmWave band eg, a 60 gigabyte (60 GHz) band.
  • beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems.
  • array antenna, analog beam-forming, and large scale antenna technologies are being discussed.
  • an evolved small cell an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network
  • D2D Device to Device communication
  • wireless backhaul moving network
  • cooperative communication Coordinated Multi-Points (CoMP), and interference cancellation etc.
  • advanced coding modulation Advanced Coding Modulation: ACM
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Simple Window Superposition Coding
  • FBMC Fanter Bank Multi Carrier
  • NOMA Non-Orthogonal Multiple Access
  • SCMA Synparse Code Multiple Access
  • IoT Internet of Things
  • M2M Machine to machine
  • MTC Machine Type Communication
  • the present invention for solving the above problems is a control signal processing method in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.
  • the present disclosure for solving the above problems is a method performed in an IAB node dually connected to a first parent integrated access and backhaul (IAB) node and a second parent IAB node in a wireless communication system, wherein the first parent obtaining radio resource configuration information based on a first multiplexing scheme for each of an IAB node and the second parent IAB node; obtaining radio resource configuration information based on a second multiplexing method for the first parent IAB node; and transmitting, to the second parent IAB node, information related to the radio resource configuration information based on the second multiplexing method for the first parent node in response to obtaining the radio resource configuration information based on the second multiplexing method.
  • IAB integrated access and backhaul
  • the present disclosure for solving the above problems is a method performed in a second parent integrated access and backhaul (IAB) node in a wireless communication system, which is dually connected to the first parent IAB node and the second parent IAB node Transmitting radio resource configuration information based on a first multiplexing method to an IAB node; and radio resource configuration based on a second multiplexing method for the first parent node in response to the IAB node acquiring, from the IAB node, radio resource configuration information based on the second multiplexing method for the first parent IAB node. It may include receiving information related to the information.
  • IAB integrated access and backhaul
  • the present disclosure for solving the above problems is an IAB node dually connected to a first parent integrated access and backhaul (IAB) node and a second parent IAB node in a wireless communication system, wherein the IAB node transmits and receives a signal.
  • IAB integrated access and backhaul
  • a transceiver configured to; and a processor connected to the transceiver, wherein the processor obtains radio resource configuration information based on a first multiplexing method for each of the first parent IAB node and the second parent IAB node; obtaining radio resource configuration information based on a second multiplexing scheme for the first parent IAB node; In response to the acquisition of radio resource configuration information based on the second multiplexing method, information related to the radio resource configuration information based on the second multiplexing method for the first parent node is transmitted to the second parent IAB node. It can be.
  • the present disclosure for solving the above problems is a second parent integrated access and backhaul (IAB) node in a wireless communication system
  • the second parent IAB node includes: a transceiver configured to transmit and receive a signal; and a processor connected to the transceiver, wherein the processor transmits radio resource configuration information based on a first multiplexing scheme to an IAB node dually connected to a first parent IAB node and a second parent IAB node. do; And, in response to the IAB node acquiring radio resource configuration information based on the second multiplexing method for the first parent IAB node, radio resource configuration based on a second multiplexing method for the first parent node, from the IAB node. It can be set to receive information related to information.
  • transmission and reception delay can be prevented by providing an operation of an IAB node that satisfies the unidirectional transmission and reception characteristics of an IAB node when transmission and reception collide with each other due to resource overlap in one IAB node.
  • FIG. 1 is a diagram illustrating a communication system in which an IAB node operates according to an embodiment of the present disclosure.
  • FIG. 2 is a diagram schematically illustrating multiplexing of an access link and a backhaul link in the time domain or frequency domain in an IAB node according to an embodiment of the present disclosure.
  • FIG 3 is a diagram illustrating that an access link and a backhaul link are multiplexed in the time domain in an IAB communication system according to an embodiment of the present disclosure.
  • FIG. 4 is a diagram illustrating that an access link and a backhaul link are multiplexed in frequency and spatial domains in an IAB communication system according to an embodiment of the present disclosure.
  • FIG. 5 is a diagram schematically illustrating the structure of an IAB node according to an embodiment of the present disclosure.
  • FIG. 6 is a diagram for explaining a communication method for simultaneous transmission and reception between an MT and a DU in an IAB node in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 7 is a diagram for explaining a DU resource type for FDM support and a DU resource type for SDM support of an IAB node in a wireless communication system according to an embodiment of the present disclosure.
  • FIG 8 is a diagram illustrating a case where an IAB node uses an FDM-type multiplexing method and switches to a TDM-type multiplexing method in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 9 is a diagram illustrating a communication system according to an embodiment of the present disclosure.
  • FIG. 10 is a diagram schematically illustrating a dual access structure of an IAB node according to an embodiment of the present disclosure.
  • FIG. 11 is a diagram schematically illustrating a dual access structure of an IAB node according to an embodiment of the present disclosure.
  • FIG. 12 is a diagram schematically illustrating an environment that may occur in a dual connection structure of an IAB node according to an embodiment of the present disclosure.
  • FIG. 13 is a flowchart for explaining a method of configuring resources when an IAB node performs dual access according to an embodiment of the present disclosure.
  • FIG. 14 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.
  • FIG. 15 is a block diagram illustrating an internal structure of a base station (Donor base station) according to an embodiment of the present disclosure.
  • 16 is a block diagram illustrating an internal structure of an IAB node according to an embodiment of the present disclosure.
  • each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions.
  • These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions.
  • These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory
  • the instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s).
  • the computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is possible for the functions mentioned in the blocks to occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in reverse order depending on their function.
  • ' ⁇ unit' used in this embodiment means software or a hardware component such as FPGA or ASIC, and ' ⁇ unit' performs certain roles.
  • ' ⁇ part' is not limited to software or hardware.
  • ' ⁇ bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, ' ⁇ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components and ' ⁇ units' may be combined into smaller numbers of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
  • components and ' ⁇ units' may be implemented to play one or more CPUs in a device or a secure multimedia card.
  • connection node a term referring to network entities, a term referring to messages, a term referring to an interface between network entities, and a term referring to various types of identification information. Etc. are illustrated for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.
  • a base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions.
  • the term terminal may refer to cell phones, NB-IoT devices, sensors, as well as other wireless communication devices.
  • the base station and the terminal are not limited to the above example.
  • the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP) LTE and/or New Radio (NR) standards.
  • 3GPP 3rd Generation Partnership Project Long Term Evolution
  • NR New Radio
  • the present disclosure is not limited by the above terms and names, and may be equally applied to systems conforming to other standards.
  • the wireless communication system has moved away from providing voice-oriented services in the early days and, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, a broadband wireless network that provides high-speed, high-quality packet data services. evolving into a communication system.
  • an Orthogonal Frequency Division Multiplexing (OFDM) method is employed in downlink (DL), and SC-FDMA (Single Carrier Frequency Division Multiplexing) in uplink (UL) Access) method is used.
  • Uplink refers to a radio link in which a terminal, user equipment (UE) or mobile station (MS) transmits data or control signals to a base station (eNode B or base station (BS)), and downlink refers to a base station It refers to a radio link that transmits data or control signals to this terminal.
  • the above multiple access scheme distinguishes data or control information of each user by allocating and operating time-frequency resources to carry data or control information for each user so that they do not overlap each other, that is, so that orthogonality is established. do.
  • Enhanced mobile broadband eMBB
  • massive machine type communication mMTC
  • ultra reliability low latency communication URLLC
  • eMBB aims to provide a data transmission rate that is more improved than that supported by existing LTE, LTE-A or LTE-Pro.
  • an eMBB in a 5G communication system, an eMBB must be able to provide a peak data rate of 20 Gbps in downlink and a peak data rate of 10 Gbps in uplink from the perspective of one base station.
  • the 5G communication system should provide a maximum transmission rate and, at the same time, an increased user perceived data rate of the terminal.
  • improvements in various transmission and reception technologies including a more advanced multi-input multi-output (MIMO) transmission technology are required.
  • MIMO multi-input multi-output
  • the 5G communication system uses a frequency bandwidth wider than 20MHz in a frequency band of 3 to 6GHz or 6GHz or higher to meet the requirements of the 5G communication system. data transfer rate can be satisfied.
  • mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems.
  • IoT Internet of Things
  • mMTC requires access support for large-scale terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal cost. Since the IoT is attached to various sensors and various devices to provide a communication function, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km 2 ) in a cell.
  • terminals supporting mMTC are likely to be located in shadow areas that are not covered by cells, such as the basement of a building due to the nature of the service, so they require wider coverage than other services provided by the 5G communication system.
  • a terminal supporting mMTC must be configured as a low-cost terminal, and since it is difficult to frequently replace a battery of the terminal, a very long battery life time such as 10 to 15 years is required.
  • URLLC it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, emergency situations A service used for emergency alert or the like may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC needs to satisfy an air interface latency of less than 0.5 milliseconds, and at the same time has a requirement of a packet error rate of 10 -5 or less. Therefore, for a service that supports URLLC, a 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time, a design that allocates wide resources in the frequency band to secure the reliability of the communication link. matter is required
  • TTI transmit time interval
  • the three services of 5G namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable and low-latency communications
  • mMTC massive machine type communications
  • different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of each service.
  • LTE, LTE-A, LTE Pro or 5G (or NR, next-generation mobile communication) systems will be described as examples in the following, embodiments of the present disclosure will be described, but other communication systems having similar technical backgrounds or channel types An embodiment of may be applied.
  • the embodiments of the present disclosure can be applied to other communication systems through some modification within a range that does not greatly deviate from the scope of the present disclosure as judged by a skilled person with technical knowledge.
  • 5G when a base station transmits and receives data to a terminal in a band of 6 GHz or higher, particularly in the mmWave band, coverage may be limited due to attenuation of the propagation path.
  • the problem of the above coverage limitation can be solved by densely disposing a plurality of relays (or relay nodes) between the base station and the propagation path of the terminal, but accordingly, installing an optical cable for backhaul connection between relays Cost issues can be serious. Therefore, instead of installing an optical cable between relays, the broadband radio frequency resources available in mmWave are used to transmit and receive backhaul data between relays, thereby solving the cost problem of installing optical cables and using the mmWave band more efficiently. .
  • IAB Integrated Access and Backhaul
  • the base station is composed of a CU (Central Unit) and a DU (Distributed Unit), and the IAB node is composed of a DU (Distributed Unit) and MT (Mobile Termination).
  • the CU may manage DUs of all IAB nodes connected to the base station through multi-hop.
  • the IAB node may use different frequency bands or the same frequency band when receiving backhaul data from the base station and transmitting access data to the terminal, and when receiving access data from the terminal and transmitting backhaul data to the base station.
  • the IAB node When using the same frequency band, the IAB node has a half duplex constraint at a moment.
  • backhaul data uplink data from the MT of the IAB node to the DU of the parent IAB node and downlink data from the DU of the IAB node to the MT of the child IAB node
  • access data to the terminal may be FDM and/or SDM.
  • the present disclosure can provide a method for an IAB node to operate according to a unidirectional transmission/reception characteristic in a data transmission/reception environment as described above.
  • FIG. 1 is a diagram illustrating a communication system in which an IAB node operates according to an embodiment of the present disclosure.
  • gNB 101 is a typical base station (eg, eNB or gNB), and is referred to as gNB or eNB or base station or Donor base station or Donor IAB in the present disclosure.
  • IAB node #1 (111) and IAB node #2 (121) are IAB nodes that transmit and receive backhaul links in the mmWave band.
  • Terminal 1 (102) transmits and receives access data through the gNB (101) and the access link (103).
  • the IAB node #1 (111) transmits and receives backhaul data through the gNB (101) and the backhaul link (104).
  • Terminal 2 (112) transmits and receives access data through the IAB node #1 (111) and the access link (113).
  • IAB node #2 (121) transmits and receives backhaul data with IAB node #1 (111) through a backhaul link (114). Therefore, IAB node #1 (111) is a parent IAB node of IAB node #2 (121), also referred to as a parent IAB (Parent IAB) node, and IAB node #2 (121) is a child of IAB node #1 (111). It is an IAB node, and is called a child IAB node. Terminal 3 (122) transmits and receives access data through the IAB node # 2 (121) and the access link (123).
  • the terminal transmits, from the serving IAB node or base station, a setting to measure a synchronization signal block (SSB)/physical broadcast channel (PBCH) or channel state information reference signal (CSI-RS) for the measurement of a neighboring IAB node.
  • SSB synchronization signal block
  • PBCH physical broadcast channel
  • CSI-RS channel state information reference signal
  • a UE is configured to measure the measurement of a neighboring base station through SSB/PBCH, the UE has at least one measurement resource for an IAB node with an even number of hop orders or a measurement resource for an IAB node with an odd number of hop orders.
  • Two SSB/PBCH Measurement Timing Configurations may be set per frequency. The UE receiving the configuration can perform measurement of an IAB node having an even number of hop orders in one SMTC, and measurement of an IAB node having an odd number of hop orders in another SMTC.
  • Coordination between donor gNBs and IAB nodes may be required for the purpose of an IAB node performing measurements on donor gNBs or IAB nodes in other neighborhoods. That is, the donor gNB matches the measurement resource of an IAB node with an even number of hop orders or the measurement resource of an IAB node with an odd number of hop orders, so that one IAB node performs measurement of a neighboring IAB node or IAB base station. The waste of resources to do this can be minimized.
  • One IAB node may receive, from a serving IAB node or a base station, a setting to measure SSB/PBCH or CSI-RS for measurement of a neighboring IAB node through an upper signal.
  • an IAB node is configured to measure the measurement of a neighboring base station through SSB/PBCH, the IAB node uses the measurement resource of the IAB node with an even number of hop orders or the measurement resource of an IAB node with an odd number of hop orders.
  • At least two SMTCs (SSB/PBCH Measurement Timing Configurations) per frequency may be set.
  • the IAB node receiving the configuration can perform measurement of IAB nodes having an even number of hop orders in one SMTC, and measurement of IAB nodes having an odd number of hop orders in another SMTC.
  • a backhaul link between a base station and an IAB node or between an IAB node and an IAB node, and an access link between a base station and a terminal or between an IAB node and a terminal are multiplexed within radio resources, FIG. 2, It will be described in more detail with reference to FIGS. 3 and 4 .
  • FIG. 2 is a diagram schematically illustrating that an access link and a backhaul link are multiplexed in an IAB node according to an embodiment of the present disclosure.
  • the upper part of FIG. 2 is a diagram illustrating multiplexing in the time domain between an access link and a backhaul link in an IAB node.
  • the lower part of FIG. 2 is a diagram illustrating multiplexing in the frequency domain between an access link and a backhaul link in an IAB node.
  • a backhaul link 203 between a base station and an IAB node or between an IAB node and an access link 202 between a base station and a terminal or between an IAB node and a terminal within a radio resource 201 shown at the top of FIG. 2 is time domain multiplexed. (TDM, Time Domain Multiplexing). Therefore, in the time domain in which the base station or IAB node transmits and receives data to the terminal, data is not transmitted and received between the base station and the IAB nodes, and in the time domain in which data is transmitted and received between the base station and the IAB nodes, the base station or the IAB node transmits data to the terminal. do not send or receive
  • a backhaul link 213 between a base station and an IAB node or between an IAB node and an IAB node within a radio resource 211 shown at the bottom of FIG. 2 and an access link 212 between a base station and a terminal or between an IAB node and a terminal is multiplexed in the frequency domain (FDM, Frequency Domain Multiplexing). Accordingly, it is possible to transmit and receive data between the base station and the IAB nodes in the time domain in which the base station or the IAB node transmits and receives data to the terminal, but only data transmission in the same direction is possible due to the unidirectional transmission and reception characteristics of the IAB nodes.
  • FDM Frequency Domain Multiplexing
  • the IAB node in a time domain in which one IAB node receives data from a terminal, the IAB node can only receive backhaul data from another IAB node or base station. In addition, in the time domain in which one IAB node transmits data to the terminal, the IAB node can only transmit backhaul data to another IAB node or base station.
  • SDM spatial domain multiplexing
  • the IAB node transmits capability for the multiplexing technique to the base station or higher IAB node, and then It can be configured by receiving configuration information from the base station or higher IAB nodes through system information or a radio resource control (RRC) signal, and after initial access, the configuration information can be received from the base station or higher IAB nodes through a backhaul link.
  • RRC radio resource control
  • FIG 3 is a diagram illustrating that an access link and a backhaul link are multiplexed in the time domain in an IAB communication system according to an embodiment of the present disclosure.
  • FIG. 3 shows a process in which the IAB node 302 communicates with the parent node 301, the child IAB node 303, and the terminal 304. Describing in more detail the link between each node, the parent node 301 transmits (311) a backhaul downlink signal to the IAB node 302 in the backhaul downlink (LP , DL ), and the IAB node 302 transmits a backhaul uplink signal 312 to the parent node 301 on a backhaul uplink (L P, UL ).
  • the IAB node 302 transmits 316 an access downlink signal on an access downlink (LA ,DL ) to the terminal 304, and the terminal 304 transmits (316) an access downlink (LA ,UL ) to the IAB node 302. ) transmits an access uplink signal (315).
  • the IAB node 302 transmits a backhaul downlink signal (313) to the child IAB node 303 in the backhaul downlink (L C,DL ), and the IAB child node 303 sends the IAB node 302 a backhaul uplink ( In L C,UL ), a backhaul upstream signal is transmitted (314).
  • P means a backhaul link with a parent
  • A means an access link with a terminal
  • C means a backhaul link with a child.
  • This link relationship is described based on the IAB node 302, and from the point of view of the IAB child node 303, the parent node is the IAB node 302, and another IAB child node exists under the IAB child node 303. can In addition, from the viewpoint of the parent node 301, the child node is the IAB node 302, and another IAB parent node may exist above the parent node 301.
  • the signal includes data and control information, a channel for transmitting data and control information, a reference signal necessary for decoding the data and control information, or reference signals for knowing channel information.
  • the lower part of FIG. 3 shows a process in which all of the above links are multiplexed in the time domain.
  • a backhaul downlink (L P,DL ) 311, a backhaul downlink (L C,DL ) 313, an access downlink (LA ,DL ) 316, and an access uplink (LA ,UL ) 315, backhaul uplink (L C, UL ) 314, and backhaul uplink (L P, UL ) 312 are multiplexed in time order.
  • the ordering relationship of the links provided in the figure is an example, and any ordering relationship can be applied regardless.
  • FIG. 4 is a diagram illustrating that an access link and a backhaul link are multiplexed in frequency and spatial domains in an IAB communication system according to an embodiment of the present disclosure.
  • the upper part of FIG. 4 shows a process in which the IAB node 402 communicates with the parent node 401, the child IAB node 403, and the terminal 404.
  • the parent node 401 transmits (411) a backhaul downlink signal to the IAB node 402 in a backhaul downlink (L P, DL ), and the IAB node 402 transmits (412) a backhaul uplink signal to the parent node 401 on a backhaul uplink (L P, UL ).
  • the IAB node 402 transmits (416) an access downlink signal to the terminal 404 on an access downlink (LA ,DL ), and the terminal 404 transmits (416) an access downlink (LA ,UL ) to the IAB node 402. ) transmits an access uplink signal (415).
  • the IAB node 402 transmits a backhaul downlink signal (413) to the child IAB node 403 on the backhaul downlink (L C,DL ), and the IAB child node 403 sends the IAB node 402 a backhaul uplink ( L C,UL ) transmits (414) a backhaul uplink signal.
  • P means backhaul link with parent
  • A means access link with terminal
  • C means backhaul link with child.
  • This link relationship is described based on the IAB node 402, and from the point of view of the IAB child node 403, the parent node is the IAB node 402, and another IAB child node exists under the IAB child node 403. can Also, from the viewpoint of the parent node 401, the child node is the IAB node 402, and another IAB parent node may exist above the parent node 401.
  • the signal includes data and control information, a channel for transmitting data and control information, a reference signal necessary for decoding the data and control information, or reference signals for knowing channel information.
  • the IAB node since the IAB node has a unidirectional transmission/reception characteristic at a moment, signals that can be multiplexed in the frequency domain or spatial domain are limited.
  • links that can be multiplexed in the time domain in which the IAB node can transmit include a backhaul uplink (L P,UL ) 412 and a backhaul downlink (L C , DL ) 413, an access downlink (LA , DL ) 416, and the like exist. Accordingly, when the links are multiplexed in the frequency domain or in the spatial domain, the IAB node 402 can transmit all the links in the same time domain as shown in (421).
  • links that can be multiplexed in the time domain in which the IAB node can receive include a backhaul downlink (L P, DL ) 411, a backhaul uplink (L C, UL ) 414, and an access uplink (L A ). , UL ) 415 and the like exist. Accordingly, when the links are multiplexed in the frequency domain or in the spatial domain, the IAB node 402 can receive all of the links in the same time domain as in step 422.
  • the multiplexing of the links provided in the figure is an example, and it goes without saying that only two links among three links multiplexed in a frequency or spatial domain can be multiplexed.
  • 5G researched various types of base station structures that are optimal for service requirements in order to support various services such as large-capacity transmission, low-latency high-reliability, or large-volume machine-to-machine communication devices, and to reduce communication network installation costs (CAPEX).
  • CAPEX communication network installation costs
  • 4G LTE in order to reduce CAPEX and effectively handle interference control, the data processing unit of the base station and the wireless transmission/reception unit (or RRH: Remote Radio Head) are separated, the data processing unit processes the data centrally, and only the wireless transmission/reception unit is placed at the cell site.
  • the RAN (C-RAN) structure has been commercialized.
  • an optical link of the Common Public Radio Interface (CPRI) standard is generally used when baseband digital IQ data is transmitted from a base station data processor to a wireless transceiver.
  • CPRI Common Public Radio Interface
  • a large data capacity is required. For example, 614.4 Mbps is required to transmit IP (Internet Protocol) data of 10 MHz, and 1.2 Gbps data rate is required to transmit IP data of 20 MHz. Therefore, in the 5G RAN structure, in order to reduce the enormous load of the optical link, the base station is separated into a central unit (CU) and a distributed unit (DU), and a functional split is applied to the CU and DU to have various structures. Design.
  • CU central unit
  • DU distributed unit
  • 3GPP is in the process of standardizing various functional split options between CU and DU.
  • Options for functional split are divided by function between protocol layers or within the protocol layer, and there are a total of 8 options from Option 1 to Option 8.
  • the structures that are considered first in the current 5G base station structure are Option 2 and Option 7. am.
  • RRC and PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY PHY
  • RF Radio Frequency
  • FIG. 5 is a diagram schematically illustrating the structure of an IAB node according to an embodiment of the present disclosure.
  • the gNB 501 is composed of CUs and DUs, and the IAB nodes have a terminal function (MT) for transmitting and receiving data between the parent node and the backhaul link and a base station function for transmitting and receiving data between the child node and the backhaul link ( DU).
  • IAB node #1 (502) is wirelessly connected to gNB (501) by one hop
  • IAB node #2 (503) is wirelessly connected to gNB (501) by two hops via IAB node #1 (502). It is connected.
  • the CU of the gNB 501 includes not only the DU of the gNB 501 but also all IAB nodes wirelessly connected to the gNB 501, that is, IAB node #1 502 and IAB node #2.
  • the DU of (503) is controlled (511, 512).
  • the CU may allocate radio resources to the DU so that the DU can transmit/receive data with MTs of IAB nodes below it.
  • the allocation of the radio resources may be transmitted to the DU through system information or an upper signal or a physical signal using an F1 Application Protocol (F1AP) interface.
  • the radio resource may be composed of a downlink time resource, an uplink time resource, a flexible time resource, and the like.
  • the downlink time resource is a resource for transmitting downlink control/data and signals to an MT of an IAB node (not shown) having a lower DU of the IAB node #2 503.
  • the uplink time resource is a resource for receiving uplink control/data and signals from an MT of an IAB node below the DU of the IAB node #2 503.
  • the flexible time resource is a resource that can be utilized as a downlink time resource or an uplink time resource by the DU of the IAB node #2 (503), and by the downlink control signal of the DU of the IAB node #2 (503).
  • the MT determines whether the flexible time resource is to be used as a downlink time resource or an uplink time resource. If the downlink control signal is not received, the MT does not perform a transmission/reception operation. That is, the MT does not monitor or decode downlink control channels in the above resources or measure signals in the above resources. In the above resources, the MT does not perform transmit/receive operations. That is, the MT does not monitor or decode downlink control channels in the above resources or measure signals in the above resources.
  • Two different types of downlink time resources, uplink time resources, and flexible time resources may be indicated from the CU to the DU.
  • the first type is the soft type, and the CU can set soft-type downlink time resources, uplink time resources, and flexible time resources to the DU of IAB node # 2 (503) using F1AP (interface between CU and DU).
  • IAB node #1 which is the parent IAB (or DU of parent IAB) of IAB node #2 (503), is an IAB node that is a child IAB (or DU of child IAB) for the soft-type resources set above.
  • # 2 503 may be explicitly instructed (eg, by DCI format) or implicitly whether the resource is utilized (available) or not utilized (not available).
  • the DU of IAB node #2 503 can utilize the resource for data transmission/reception with the MT of the lower IAB node. That is, the DU of the IAB node #2 503 may perform transmission in the case of a downlink resource or reception in the case of an uplink resource by utilizing the resource. If it is indicated that the resource cannot be utilized, the IAB node #2 503 cannot utilize the resource for data transmission/reception with the MT of the lower IAB node. That is, the DU of the IAB node #2 503 cannot be transmitted or received using the resource.
  • the DCI format in this embodiment may include an availability indicator for indicating the availability of one or more consecutive upward or downward or flexible symbols.
  • IAB node #2 (503) In order to receive the DCI format, IAB node #2 (503) together with the cell ID of the DU of IAB node #2 (503) in advance, the availability indicating the utilization of the IAB node #2 in the DCI format Information on at least one of the location information of the indicator, a table indicating the utilization of time resources corresponding to a plurality of slots, and the mapping relationship between the utilization indicators is stored in the CU or parent IAB (eg, IAB node #1 ( 502)) can be received by the upper signal.
  • Values (or indicators) indicating utilization of continuous uplink symbols, downlink symbols, or flexible symbols within one slot and the meanings of the values (or indicators) may be configured as shown in Table 1 below.
  • the DU of the IAB node #2 (503) The following method can be considered as a method of interpreting the relationship between the downlink, uplink, or flexible time resources set from the CU in the IAB DU and the aforementioned utilization.
  • the IAB DU is included in the above DCI format. This is a method in which the number of values indicating the availability included in the availability indicator to be used is expected to match the number of slots including the soft type composed of consecutive symbols set by the CU. According to this method, the IAB DU can determine that the utilization is applied only to slots including the soft type.
  • the number of values indicating the availability of the availability indicator included in the DCI format of the IAB DU is the number of all slots set by the CU, that is, all slots including hard/soft/NA types. It is a method that is expected to match the number of .
  • the IAB DU may determine that the utilization is applied only to a slot including a soft type, and may determine that the indicated utilization is not applied to a slot including only a hard or NA type without a soft type. there is.
  • the meaning of the value indicating the availability of the IAB DU can be expected to match the downlink resource, uplink resource, or flexible resource set by the CU. For example, when only downlink soft resources or downlink hard resources exist in a slot, it can be expected that only a value of 1 in Table 1 above is indicated for the IAB DU. Therefore, among the values in the table above, it can be expected that values including utilization of uplink soft resources are not indicated.
  • the IAB DU may determine that at least in the flexible resources set by the CU, it is possible to indicate whether downstream resources or upstream resources are available in addition to a value indicating that flexible resources are available. For example, in the case of flexible soft resources or flexible hard resources, it can be expected that the DU of the IAB node can indicate a value of 1 or 2 instead of the value of 4 in Table 1 above. In this case, the DU of IAB node #2 may determine that the flexible resource can be utilized only upward or downward according to the instruction of the parent IAB, instead of being utilized upward or downward according to the determination of IAB node #2. there is.
  • the IAB DU expects that the value 0 in the above table can be indicated in any hard/soft or NA (non-available) resource configured by the CU.
  • the IAB DU determines that resource utilization is not possible in the hard/soft resource previously set by the CU, and is not always available resource set by the CU until it is indicated that it can be used by the DCI format later.
  • the above resources cannot be utilized for the DU of IAB node #2 to transmit/receive data with the MT of the lower IAB node.
  • the DU of the IAB node # 2 can set the resource and use it as received by the DCI format.
  • the second type is the hard type, and the above resources are always utilized between the DU and MT. That is, the DU of IAB node #2 (503) can be transmitted when the resource is a downlink time resource, regardless of the MT transmission and reception operation of the IAB node #2 (503), and received when the resource is an uplink resource can be performed. If the resource is a flexible resource, transmission or reception is performed by IAB DU determination (ie, consistent with the DCI format indicating whether the flexible resource is a downstream resource or an upstream resource to the MT of the lower IAB node) can
  • the third type is a type that is not always available (always not used or always non-available), and the above resources cannot be utilized by the DU of IAB node #2 for data transmission and reception with MT.
  • the above types are received together when a downlink time resource, an uplink time resource, a flexible time resource, and a reserved time resource are received as upper signals from the CU to the DU.
  • the DU of the gNB 501 is a normal base station, and the DU controls the MT of the IAB node #1 502 to perform scheduling to transmit and receive data (521).
  • the DU of IAB node #1 (502) is a normal base station, and the DU controls the MT of IAB node #2 (503) to perform scheduling to transmit and receive data (522).
  • the DU may indicate radio resources to transmit/receive data with MTs of IAB nodes below it based on radio resources allocated from the CU.
  • the radio resource configuration may be transmitted to the MT through system information, higher level signals, or physical signals.
  • the radio resource may be composed of a downlink time resource, an uplink time resource, a flexible time resource, a reserved time resource, and the like.
  • the downlink time resource is a resource for transmitting downlink control/data and signals to the MT of the IAB node below the DU.
  • the uplink time resource is a resource for receiving uplink control/data and signals from an MT of an IAB node below the DU.
  • the flexible time resource is a resource that can be used as a downlink time resource or an uplink time resource by the DU, and how the flexible time resource is used by the MT of the lower IAB node by the downlink control signal of the DU may be indicated.
  • the MT determines whether the flexible time resource is to be used as a downlink time resource or an uplink time resource. If the downlink control signal is not received, the MT does not perform a transmission/reception operation. That is, the MT does not monitor or decode downlink control channels in the above resources or measure signals in the above resources.
  • the downlink control signal is signaled to the MT as a combination of an upper level signal and a physical signal, and the MT can determine a slot format in a specific slot by receiving the signaling.
  • the slot format basically starts with a downward symbol, has a flexible symbol in the middle, and ends with an upward symbol at the end (that is, has a structure having a sequence of D-F-U).
  • the DU of the IAB node can perform downlink transmission at the start of the slot, but since the MT of the IAB node is set only with the above slot format (ie, D-F-U structure) from the parent IAB, the same Uplink transmission cannot be performed on time (corresponding to slot format indexes 0 to 55 in Table 2 below).
  • a slot format configured to start with an uplink symbol, have a flexible symbol in the middle, and end with a downlink symbol at the end. This may be defined as shown in Table 2 below (corresponding to slot format indexes 56 to 96 in Table 2 below).
  • the slot format defined in Table 2 below is transmitted to the MT using the downlink control signal, and can be configured from the CU using the F1AP to the DU.
  • the reserved time resource is a resource in which the DU cannot transmit/receive data with a lower MT, and the MT does not transmit/receive operations in the resource. That is, the MT does not monitor or decode the downlink control channel in the above resource or measure the signal in the above resource. Therefore, the MT in one IAB node is controlled by the DU in the IAB nodes above it to perform scheduling. Data is transmitted and received by receiving, and the DUs in the same IAB nodes are controlled by the CU of the gNB 501. That is, MTs and DUs in one IAB are controlled by different subjects, and it may be difficult to coordinate in real time.
  • FIG. 6 is a diagram for explaining a communication method for simultaneous transmission and reception between an MT and a DU in an IAB node in a wireless communication system according to an embodiment of the present disclosure.
  • simultaneous transmission and reception between MTs and DUs in one IAB node means that the MT transmits or receives and the DU transmits or receives at the same time by the multiplexing method (FDM or SDM) described in FIG. 2.
  • FDM or SDM multiplexing method
  • reference number 601 illustrates that both MTs and DUs transmit respective signals within one IAB node.
  • a signal transmitted by the MT of the IAB node may be received by a DU of a parent IAB node or a base station through a backhaul uplink as described in FIGS. 3, 4, and 5.
  • the signal transmitted by the DU of the IAB node in 601 is received by the MT of the IAB node through the backhaul downlink or received by the access terminal through the access downlink, as described in FIGS. 3, 4, and 5. can be received
  • Reference numeral 602 shows that both MT and DU within one IAB node receive respective signals.
  • the signal received by the MT of the IAB node may be a signal transmitted from a DU of a parent IAB node or a base station through a backhaul downlink as described in FIGS. 3, 4, and 5.
  • the signal received by the DU of the IAB node in 602 is transmitted by the MT of the IAB node through the backhaul uplink as described in FIGS. 3, 4, and 5, or by the access terminal through the access uplink. It may be a transmitted signal.
  • Reference numeral 603 indicates that both the MT and the DU within the IAB node receive or transmit respective signals. That is, at 603, the MT in the IAB node can receive its own signal, and at the same time, the DU in the IAB node can transmit its own signal.
  • the signal received by the MT of the IAB node may be a signal transmitted from a parent IAB node or a DU of a base station through a backhaul downlink as described in FIGS. 3, 4, and 5.
  • the signal transmitted by the DU of the IAB node in 603 is received by the MT of the IAB node through the backhaul downlink or received by the access terminal through the access downlink, as described in FIGS. 3, 4, and 5. can be received
  • Reference numeral 604 shows that both the MT and the DU in the IAB node transmit or receive respective signals. That is, in step 604, the MT in the IAB node transmits its own signal, and at the same time, the DU in the IAB node can receive its own signal.
  • the signal transmitted by the MT of the IAB node may be received by the DU of the parent IAB node or base station through the backhaul uplink as described in FIGS. 3, 4, and 5.
  • the signal received by the DU of the IAB node in 604 is transmitted by the MT of the IAB node through the backhaul uplink as described in FIGS. 3, 4, and 5, or by the access terminal through the access uplink. It may be a transmitted signal.
  • reference numerals 601 and 602 in a situation where both MTs and DUs within one IAB node transmit or receive respective signals, a method for configuring a DU resource type and an embodiment of the procedure of the mother IAB node and IAB node according to the method is provided. something to do.
  • the embodiments provided below may be applied to reference numerals 603 and 604 as well as reference numerals 601 and 602 .
  • FIG. 7 is a diagram for explaining a DU resource type for FDM support and a DU resource type for SDM support of an IAB node in a wireless communication system according to an embodiment of the present disclosure.
  • the CU of the gNB may allocate radio resources to the DU so that the DU can transmit/receive data with an MT of an IAB node below it.
  • the allocation of the radio resources may be transmitted to the DU through an upper layer signal such as system information or RRC information or a physical layer signal using an F1 Application Protocol (F1AP) interface.
  • the radio resource may be composed of a downlink frequency-time resource, an uplink frequency-time resource, a flexible frequency-time resource, etc.
  • Resources are set in the frequency-time domain of a specific frequency within the carrier (eg, at least one or more PRBs or a frequency domain in which at least one or more PRBs are set as an allocation unit on a frequency) and a specific time (eg, at least one or more slots) It can be.
  • frequency-time is omitted for convenience.
  • three types of downlink resources, uplink resources, and flexible resources can be indicated from the CU to the DU of the IAB node.
  • the first type is the soft type 702
  • the CU of the gNB can set soft-type downlink resources, uplink resources, and flexible resources to the DU of the IAB node using F1AP (interface between CU and DU).
  • the mother IAB node which is the parent IAB (or DU of the parent IAB) of the IAB node, determines whether the above resources are utilized by the IAB node, which is the child IAB (or DU of the child IAB). ) or not available (eg, by DCI format) or implicitly indicated. That is, when it is indicated that a specific resource can be utilized, the DU of the IAB node can utilize the resource for data transmission/reception with the MT of the lower IAB node. That is, the DU of the IAB node may perform transmission in the case of a downlink resource or reception in the case of an uplink resource by utilizing the resource. If it is indicated that the resource cannot be utilized, the IAB node cannot utilize the resource for data transmission/reception with the MT of the subordinate IAB node. That is, the DU of the IAB node cannot be transmitted or received using the resource.
  • the DCI format in this embodiment may include an availability indicator for indicating the availability of one or more consecutive upward or downward or flexible symbols.
  • the location information of the availability indicator indicating the availability of the IAB node in the DCI format together with the cell ID of the DU of the IAB node in advance, corresponding to multiple frequency-times Information on at least one of a table indicating utilization of a resource to be used and a mapping relationship between utilization indicators may be received by a higher layer signal from the CU or parent IAB.
  • the second type is the hard type 701, and the above resources are always utilized between the DU and MT. That is, the DU of the IAB node can be transmitted when the resource is a downlink time resource, and can be received when the resource is an uplink resource, regardless of the transmission/reception operation of the MT of the IAB node. If the resource is a flexible resource, transmission or reception is performed by IAB DU determination (ie, consistent with the DCI format indicating whether the flexible resource is a downstream resource or an upstream resource to the MT of the lower IAB node) can
  • the third type is the NA (always not used or always non-available) type 703, and the above resources cannot be utilized by the DU of the IAB node for data transmission/reception with the MT.
  • the above types can be received together when downlink resources, uplink resources, flexible resources, and reserved resources are received as upper signals from the CU to the DU.
  • transmission/reception interference may occur between DUs and MTs of an IAB node because DUs and MTs of an IAB node transmit and receive simultaneously in adjacent frequency resources at the same time.
  • a guard frequency region for mitigating transmission and reception interference of may be set by an IAB node or a base station/parent IAB node within the DU resource type, and an upper signal/physical signal/backhaul signal between the IAB node and the base station/parent IAB node Information on the guard frequency domain may be shared by being transmitted and received as .
  • the base station/parent IAB node may set up to 128 TCI states for DUs and MTs of the IAB node, respectively, through higher-level signals/backhaul signals to the IAB node.
  • the above TCI state may include the following beam related information.
  • the above QCL information includes cell ID, bandwidth part ID, CSI-RS ID information when the reference signal is CSI-RS, SSB index information when the reference signal is SSB, and QCL types of type A and type B , information on whether it is type C or type D, etc.
  • the base station/parent IAB node may activate up to 8 TCI states among up to 128 TCI states for the DU and MT of the IAB node through a MAC CE signal/backhaul signal to the IAB node, respectively.
  • the base station/parent IAB node instructs the IAB node of at least one or more TCI states among the maximum of eight activated TCI states through a physical signal, so that the DU and MT of the IAB node are respectively transmitted through at least one specific beam. Data can be sent and received.
  • the DU of the IAB node may coordinate a beam for use with the base station/parent IAB node 801.
  • the CU may set the hard type 751, soft type 752, and NA type 753 to the DU of the IAB node for specific beams corresponding to the TCI state.
  • the DU of the IAB node can transmit/receive data using the hard type 751 beam regardless of the influence on the transmission/reception beam of the MT of the IAB node.
  • the DU of the IAB node can transmit/receive data using the soft type 752 beam without affecting the transmission/reception beam of the IAB node MT.
  • the fact that the MT of the IAB node is not affected can be further explained in the following case.
  • the MT of the IAB node does not transmit/receive during the frequency time resource of the DU of the IAB node.
  • transmission/reception of the MT of the IAB node does not change due to transmission/reception during the frequency time resource of the DU of the IAB node.
  • the MT of the IAB node receives a DCI format indicating that soft-type resources are available.
  • the DU of the IAB node does not transmit/receive data in the beam of the NA type 753.
  • the CU may alternately set the hard type, soft type, and NA type to the DU of the IAB node for a specific time (slot or symbol) for specific beams corresponding to the TCI state. (761, 762).
  • the base station/parent IAB node may transmit the configuration information to the IAB node through an upper signal/backhaul signal.
  • the setting information includes bitmap information for hard type, soft type, and NA type at a specific time, period and offset information of each hard type, soft type, and NA type, TCI state information to which the DU type information is applied, etc. can do.
  • the CU may set only the hard type and NA type for specific beams corresponding to the TCI state to the DU of the IAB node. Since it is difficult to determine the influence of the soft type on the MT of the IAB node, it is possible to apply only the above type.
  • the method in the first or second method may be applied.
  • the CU configures the DU of the IAB node for specific beams corresponding to the TCI state, instead of the hard type or NA type, only beams that can be used by the DU or beams that the DU cannot use. possible.
  • the beams that can be used by the DU or the beams that cannot be used by the DU are set by the base station / parent IAB node by the upper signal / backhaul signal, and the usable and non-usable beams may be fixed regardless of time, and a specific time Bitmap information on beams available or unusable by the DU in , period and offset information on beams available or unusable by the DU, beams available or unavailable at the time It may include TCI state information to which information is applied.
  • TDM multiplexing by time radio resource method described in FIG. 5
  • FDM multiplexing by time-frequency radio resource method described in FIG. 7
  • SDM multiplexing by beam radio resource method described in FIG. 7
  • the IAB node transmits the capability information to the base station or higher IAB node, which multiplexing technique to use may be implemented by the IAB node, and may be implemented during a specific slot or radio frame or during a specific interval or continuously thereafter. Which multiplexing technique to use may be reported to the base station or higher IAB nodes through backhaul or higher layer signaling or physical signals. Therefore, in order to support the switching of the multiplexing method in real time, the IAB node is TDM (multiplexing by time radio resource method described in FIG.
  • FDM multiplexing by time-frequency radio resource method described in FIG. 7
  • SDM Radio resource configuration information including DU resource type information required to operate is preset or received from the base station / parent IAB node through higher signal / backhaul signal / physical signal. there is.
  • the multiplexing methods of the FDM and SDM methods have the advantage of being able to transmit and receive a lot of data in a short time, but may be more affected by interference than the multiplexing method of the TDM method. Therefore, when the IAB node determines that it is difficult to perform simultaneous transmission and reception in a situation where the DU and MT of the IAB node are transmitting data using the FDM or SDM, or when the parent IAB node instructs a fallback to TDM The IAB node can transmit and receive data by switching to TDM without transmitting and receiving data using SDM/FDM anymore.
  • a method of setting the DU resource type of the IAB node when switching to the TDM and a corresponding procedure of the IAB node will be described with reference to FIG. 8 .
  • FIG 8 illustrates a case in which an IAB node uses an FDM-type multiplexing method and switches to a TDM-type multiplexing method in a wireless communication system according to an embodiment of the present disclosure.
  • the IAB node supports real-time switching of multiplexing methods such as TDM (multiplexing by time radio resource method described in FIG. 5), FDM (multiplexing by time-frequency radio resource method described in FIG. 7), and SDM.
  • radio resource configuration information including DU resource type information required to operate (multiplexing by beam radio resource described in FIG. 7) is preset or received from the base station / parent IAB node through higher signal / backhaul signal / physical signal do.
  • the IAB node transmits and receives data in hard type (801), soft type (802), and NA type (803) resources configured from the base station/parent IAB node.
  • the IAB node determines that the environment is difficult to transmit/receive simultaneously while the IAB node is in the process of transmitting/receiving data, or the base station/parent IAB node instructs switching to TDM with a physical signal, and the IAB node transmits the physical signal
  • the IAB node does not transmit/receive data using SDM/FDM anymore, switches to TDM, and uses DU resource type 812 for use in TDM It can be applied to send and receive data.
  • FIG. 9 is a diagram illustrating a communication system according to an embodiment of the present disclosure. 9 shows an example of a system configured by combining a base station in charge of a new radio access technology and an LTE/LTE-A base station, but a system configured by combining base stations in charge of a new radio access technology is also possible.
  • small base stations 903 , 905 , and 907 having relatively small coverages 904 , 906 , and 908 may be disposed within a coverage 902 of a macro base station 901 .
  • the macro base station 901 is capable of transmitting a signal with relatively higher transmission power than the small base stations 903, 905, and 907, so the coverage 902 of the macro base station 901 is smaller than the small base stations 903, 905, and 907.
  • FIG. 9 the coverage
  • the macro base station represents an LTE/LTE-A system operating in a relatively low frequency band
  • the small base stations 903, 905, and 907 represent a new radio access technology (NR or 5G) operating in the relatively high frequency band. ) is applied to the system.
  • NR or 5G new radio access technology
  • the macro base station 901 and the small base stations 903, 905, and 907 are interconnected, and a certain amount of backhaul delay may exist depending on a connection state. Therefore, it may not be desirable to exchange information sensitive to transmission delay between the macro base station 901 and the small base stations 903, 905, and 907.
  • FIG. 9 illustrates carrier aggregation between the macro base station 901 and the small base stations 903, 905, and 907, but the present disclosure is not limited thereto and carrier aggregation between base stations geographically located in different places. can be applied for For example, it can be applied to both carrier aggregation between macro base stations and macro base stations located in different places, or carrier aggregation between small base stations and small base stations located in different places, according to embodiments. Also, the number of combined carriers is not limited. Alternatively, in the present disclosure, it is also possible to apply carrier aggregation within the macro base station 901 and carrier aggregation within the small base stations 903, 905, and 907.
  • a macro base station 901 may use frequency f1 for downlink signal transmission, and small base stations 903, 905, and 907 may use frequency f2 for downlink signal transmission.
  • the macro base station 901 may transmit data or control information to a predetermined terminal 909 through frequency f1, and the small base stations 903, 905, and 907 may transmit data or control information through frequency f2.
  • a base station applying a new radio access technology capable of supporting ultra-wideband in a high frequency band provides ultra-high-speed data service and ultra-low latency service, along with LTE/LTE-A technology in a relatively low frequency band.
  • An applied base station can support stable mobility of a terminal.
  • the terminal 909 may transmit data or control information to the macro base station 901 through the frequency f1' for uplink signal transmission.
  • the terminal 909 may transmit data or control information to the small base stations 903, 905, and 907 through the frequency f2' for uplink signal transmission.
  • the f1' may correspond to the f1
  • the f2' may correspond to the f2.
  • Uplink signal transmission of the terminal may be performed at different times or at the same time to the macro base station and the small base station. In any case, due to the physical limitations of the power amplifier device of the terminal and the radio wave regulation of the terminal transmission power, the sum of uplink transmission power of the terminal at any moment must be maintained within a predetermined threshold value.
  • DC dual connectivity
  • the terminal 909 performs an initial access to the macro base station 901 operating in the LTE / LTE-A system
  • setting information for data transmission and reception for the macro base station is transmitted as a higher level signal ( system or RRC signal).
  • configuration information for data transmission/reception for the small base stations 903, 905, and 907 operating in the NR system is received from the upper signal (system or RRC signal) of the macro base station 901, and the small base stations 903, 905,
  • the macro base station 901 and the small base stations 903, 905, and 907 enter a dual access state in which data can be transmitted and received.
  • the macro base station 901 operating in the LTE/LTE-A system is referred to as a Master Cell Group (MCG), and the small base stations 903, 905, and 907 operating in the NR system are referred to as Secondary Cell Group (SCG).
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • the fact that the terminal 909 is in the above dual connectivity state may be expressed as the fact that the terminal 909 is set to MCG using E-UTRA radio access (or LTE/LTE-A) and SCG using NR radio access. Alternatively, it may be expressed that the terminal 909 is set to EN-DC (E-UTRA NR Dual Connectivity).
  • setting information for transmitting and receiving data to the small base stations is transmitted as an upper signal (system or RRC signal).
  • setting information for data transmission and reception for the macro base station 901 operating in the LTE / LTE-A system is received from the upper signal (system or RRC signal) of the small base station 903, 905, 907, and the macro base station (
  • system or RRC signal the upper signal of the small base station 903, 905, 907, and the macro base station
  • the small base stations 903, 905, and 907 operating in the NR system are referred to as MCGs
  • the macro base station 901 operating in the LTE system is referred to as an SCG.
  • the fact that the terminal 909 is in the above dual connectivity state may be expressed as the fact that the terminal 909 is set to MCG using NR radio access and SCG using E-UTRA radio access (or LTE/LTE-A).
  • E-UTRA radio access or LTE/LTE-A
  • NE-DC NR E-UTRA Dual Connectivity
  • the terminal 909 performs initial access to the first base stations 901, 903, 905, and 907 operating in the NR system
  • setting information for data transmission and reception with respect to the base station is transmitted as an upper signal ( system or RRC signal).
  • configuration information for data transmission and reception for another second base station (901, 903, 905, 907) operating in the NR system is received from the upper signal (system or RRC signal) of the first base station, and transmitted to the second base station
  • a first base station operating in the NR system is referred to as MCG
  • SCG second base station operating in the NR system
  • the fact that the UE 909 is in the dual connectivity state may be expressed as being set to MCG using NR radio access and SCG using NR radio access. Alternatively, it may be expressed that the terminal 909 is set to NR NR Dual Connectivity (NN-DC).
  • N-DC NR NR Dual Connectivity
  • the dual connection configuration has been described based on a predetermined terminal 909, but the dual connectivity configuration can also be applied to the IAB node 914.
  • the dual connection setup and access procedure of the terminal 909 described above can also be applied to the dual connection of the IAB node 914. Therefore, by applying the dual access procedure and method of the terminal 909, the IAB node 914 connects to different parent IAB nodes 911 and 912 respectively connected to different Donor base stations 901 and 907 through a wireless backhaul. Dual access may be performed (915), and dual access may be made to different parent IAB nodes 912 and 913 connected to one Donor base station 901 through a wireless backhaul (916).
  • FIGS. 10 and 11 the dual connection structure of the IAB node will be described in detail.
  • FIG. 10 is a diagram schematically illustrating a dual access structure of an IAB node according to an embodiment of the present disclosure.
  • the dual connection structure of the IAB node in FIG. 10 is a structure considering the Function Split described in this disclosure.
  • the gNB 1001 is composed of CUs and DUs, and the IAB nodes have a terminal function (MT) for transmitting and receiving data between the parent node and the backhaul link and a base station function for transmitting and receiving data between the child node and the backhaul link ( DU).
  • the parent IAB node #1 (1002) is wirelessly connected (1011) with the gNB (1001) through one hop
  • the parent IAB node #2 (1003) is wirelessly connected (1012) with the gNB (1001) through one hop.
  • has been IAB node #1 (1004) is dually connected to different parent IAB node #1 (1002) and parent IAB node #2 (1003), and has two hops with gNB (1001) via the different parent IAB node. is connected wirelessly.
  • the CU of the gNB 1001 includes not only the DU of the gNB 1001 but also all IAB nodes wirelessly connected to the gNB 1001, that is, the parent IAB node #1 (1002) and the parent IAB node #2 (1003) controls the DU of IAB node #1 (1004).
  • the CU may allocate radio resources to the DU so that the DU can transmit/receive data with MTs of IAB nodes below it.
  • the allocation of the radio resources may be transmitted to the DU through system information or an upper signal or a physical signal using an F1 Application Protocol (F1AP) interface.
  • F1AP F1 Application Protocol
  • the IAB node of the DU receiving the radio resource includes each downlink resource including information such as time, time-frequency, beam, etc., uplink resource, flexible resource and resource type, utilization It is used to transmit/receive downlink control/data and signals and uplink control/data and signals with MTs of lower child IAB nodes according to the resource configuration and the instruction of the DU of the upper parent IAB node.
  • IAB node #1 (1004) is dually connected to different parent IAB node #1 (1002) and parent IAB node #2 (1003), and the parent IAB node #1 (1002) and parent IAB node # 2 (1003) is connected to one Donor base station (1001) by wireless backhaul.
  • the MTs in the IAB node #1 (1004) are controlled by the DUs in the upper parent IAB nodes (1002 or 1003) to receive scheduling and transmit/receive data, and the DUs of the IAB node #1 (1004) Since must perform the role of a base station for transmitting and receiving data with subordinate IAB nodes and terminals, it may be difficult to coordinate with each other in real time.
  • resource configuration for transmission/reception with the MT of IAB node #1 (1004) between parent IAB nodes (1002 or 1003) in advance and DU of IAB node #1 (1004) with subordinate IAB nodes and terminals Assignment of information about resource configuration, resource type, utilization, etc. for transmitting and receiving data to radio resources can be coordinated using an F1AP (F1 Application Protocol) interface or a backhaul interface (XN or X2).
  • F1AP F1 Application Protocol
  • FIG. 11 is a diagram schematically illustrating a dual access structure of an IAB node according to an embodiment of the present disclosure.
  • the dual connection structure of the IAB node in FIG. 11 is a structure considering the Function Split described in this disclosure.
  • gNB #1 1101 is composed of CU and DU, and the IAB nodes are a terminal function (MT) for transmitting and receiving data between the parent node and the backhaul link, and a base station for transmitting and receiving data between the child node and the backhaul link. It consists of functions (DUs).
  • parent IAB node #1 (1103) is wirelessly connected (1111) with gNB #1 (1101) through 1 hop, and parent IAB node #2 (1104) is wirelessly connected to gNB #2 (1102) through 1 hop.
  • IAB node #1 (1105) is dually connected to different parent IAB node #1 (1103) and parent IAB node #2 (1104), and via the different parent IAB nodes, gNB #1 (1101) and gNB It is wirelessly connected to #2 (1102) through two hops.
  • the CU of gNB #1 (1101) includes not only the DU of gNB #1 (1101) but also all subordinate IAB nodes that are wirelessly connected to gNB #1 (1101), that is, the parent IAB node # 1 (1103), and the CU of gNB #2 (1102) can control not only the DU of gNB #2 (1104) but also all lower IAB nodes wirelessly connected to gNB #2 (1102), That is, the DU of the parent IAB node #2 1104 can be controlled.
  • a DU of an IAB node #1 1105 wirelessly connected to both gNB #1 1101 and gNB #2 1102 may be controlled through a CU of a gNB (eg, gNB #1) that is an MCG.
  • the CU may allocate radio resources to the DU so that the DU can transmit/receive data with MTs of IAB nodes below it.
  • the allocation of the radio resources may be transmitted to the DU through system information or an upper signal or a physical signal using an F1 Application Protocol (F1AP) interface.
  • F1AP F1 Application Protocol
  • the IAB node of the DU receiving the radio resource includes each downlink resource including information such as time, time-frequency, beam, etc., uplink resource, flexible resource and resource type, utilization It is used to transmit/receive downlink control/data and signals and uplink control/data and signals with MTs of lower child IAB nodes according to the resource configuration and the instruction of the DU of the upper parent IAB node.
  • IAB node #1 (1105) is dually connected to different parent IAB node #1 (1103) and parent IAB node #2 (1104), and the parent IAB node #1 (1103) and parent IAB node # 2 (1104) are connected to different Donor base stations (1101 or 1102) by wireless backhaul. Accordingly, the MTs in the IAB node #1 (1105) are controlled by the DUs in the upper parent IAB nodes (1103 or 1104) to receive scheduling and transmit/receive data, and the DUs of the IAB node #1 (1105) Since must perform the role of a base station for transmitting and receiving data with subordinate IAB nodes and terminals, it may be difficult to coordinate with each other in real time, as in the dual access structure in FIG. 10.
  • Information about resource configuration, resource type, utilization, etc. for the DU to transmit/receive data with lower IAB nodes and terminals is allocated to radio resources using the F1AP (F1 Application Protocol) interface or backhaul interface (XN or X2). can be coordinated.
  • F1AP F1 Application Protocol
  • XN or X2 backhaul interface
  • the radio resources for the DU of IAB node # 1 between different parent IAB nodes or gNBs that is, time, time-frequency, and beam as described in FIGS. 5 and 7
  • Coordination for the resource setting composed of each downlink resource, uplink resource, flexible resource and resource type, utilization, etc. including information such as etc. may be performed in advance.
  • the different parent IAB nodes may determine whether the DU of IAB node #1 applies TDM resource configuration, FDM resource configuration, or SDM resource configuration in real time. If the IAB node #1 transmits/receives data through FDM or SDM resource configuration as described in FIGS. 7 and 8, the resource configuration with a specific parent IAB node may fall back to TDM.
  • the IAB node #1 can transmit and receive data by switching to TDM without transmitting and receiving data using SDM/FDM anymore. In this case, transmission/reception interference may still occur between another parent IAB node that transmits/receives data through SDM/FDM and the specific parent IAB node that transmits/receives data through TDM.
  • FIG. 12 is a diagram schematically illustrating an environment that may occur in a dual connection structure of an IAB node according to an embodiment of the present disclosure.
  • FIG. 12 shows a situation in which IAB node #1 1204 is wirelessly connected to different parent IAB nodes through dual connectivity as described in FIGS. 10 and 11 (for example, wireless connection with parent IAB node #1 1202). (1213), and wireless connection (1214) with parent IAB node #2 (1203), the parent IAB nodes send the MT of IAB node #1 (1204) the time radio resource described in FIG. 5, in FIG. Indicates the described time-frequency radio resources and beam radio resources, and shows a situation in which the CU of the gNB in FIGS. 10 and 11 instructs the DU of the IAB node # 1 1204 to allocate resources in FIGS. 5 and 7 there is.
  • the MT of IAB node #1 (1204) performs downlink reception or uplink transmission according to the settings and instructions of parent IAB node #1 (1202) and parent IAB node #2 (1203).
  • the DU of IAB node #1 1204 can perform uplink reception or downlink transmission to the lower IAB node MT by setting and instructions.
  • the MT of the IAB node #1 determines the resource as a downstream resource, an upstream resource, or a flexible resource according to the setting and instructions of the DU of the parent IAB node #1 (1202). In addition, the MT of IAB node #1 (1204) determines the resource as a downlink resource, uplink resource, or flexible resource according to the setting and instructions of the DU of the parent IAB node #2 (1203). In addition, the DU of IAB node #1 (1204) determines the resource as a downstream resource, an upstream resource, or a flexible resource according to the setting of the CU, and according to the type, H (Hard), S (Soft), NA (Not Available) judge
  • IAB node #1 1204 is TDM (multiplexing by time radio resource method described in FIG. 5), FDM (multiplexing by time-frequency radio resource method described in FIG. 7), SDM Assume that radio resource configuration information including DU resource type information required to operate (multiplexing by beam radio resources described in FIG. 7) is preset or received from the base station/parent IAB node through higher signal/backhaul signal/physical signal do.
  • the MT of the IAB node #1 1204 determines the corresponding time resource as a downlink time resource according to the respective scheduling of the parent IAB node #1 1202 or the parent IAB node #2 1203, the downlink control/data channel and a reference signal can be received, and if the corresponding time resource is determined to be an uplink time resource, an uplink control/data channel and a reference signal can be transmitted. can receive or transmit upstream control/data channels and reference signals.
  • the DU of the IAB node #1 1204 although not shown in FIG. 12, may receive resource configuration corresponding to the time resource from the MT of the lower IAB node.
  • the DU of the IAB node #1 1204 is TDM (multiplexing by time radio resource method described in FIG. 5), FDM (multiplexing by time-frequency radio resource method described in FIG. 7), and SDM (beam multiplexing described in FIG. 7)
  • Radio resource setting information including DU resource type information required to operate multiplexing by radio resources) is received through upper signal / backhaul signal / physical signal, and the resources are determined as downlink resources, uplink resources, and flexible resources for uplink control Instructs to transmit a /data channel and reference signal to receive the uplink control/data channel and reference signal, or transmits the downlink control/data channel and reference signal.
  • the MT and DU of the IAB node #1 (1204) must respectively determine and perform transmission and reception in the time resource according to the instruction and decision of the parent IAB nodes and the setting of the CU.
  • the IAB node #1 As described in FIGS. 7 and 8, resource configuration with a specific parent IAB node (parent node #2 in FIG. 12) can fall back to TDM while transmitting and receiving with FDM or SDM resource configuration.
  • the IAB node #1 when the IAB node determines that it is difficult to perform simultaneous transmission and reception in a situation where the DU and MT of the IAB node #1 are transmitting and receiving data using the FDM or SDM, or the parent IAB node #2 uses TDM When fallback is instructed, the IAB node #1 can transmit and receive data by switching to TDM without transmitting and receiving data using SDM/FDM anymore.
  • the soft resource of the DU of the parent IAB node #1 that still transmits and receives data by SDM/FDM can be located only in the specific frequency band 1223 of carrier 1 1221, and the hard resource (which is another DU resource type) 1222) and the NA resource 1224 may simultaneously exist in a specific frequency band.
  • the soft resource 1225 of the parent IAB node #2 which transmits and receives data through TDM, may be located in the entire band of carrier 1 1221. Therefore, there may be a difference between the DU resources indicated by the two parent nodes or the two gNBs, and it may be necessary to define the operation of the IAB node for each DU resource type in the band of the carrier 1 (1221).
  • the IAB node when transmission and reception collide with each other when the resources of DUs in one IAB node are different between different parent nodes, the IAB node satisfies the unidirectional transmission and reception characteristics of the IAB node. Provided through the following embodiments can do.
  • Example 1 the parent IAB node #2 ( 1203) or when the DU resource set by the gNB above the parent IAB node #2 (1203) is changed (or falls back) based on TDM, the IAB node #1 (1204) receives another parent IAB node #1 (1202). ) or the DU resource configured by the gNB above the parent IAB node #1 1202 is also changed (or falls back) based on TDM.
  • changing (or falling back) based on TDM means that the IAB node #1 1204 uses TDM-based resource configuration during fallback as described in FIG. 8.
  • the IAB node #1 1204 uses other Assuming that the DU resource set by the parent IAB node #1 1202 or the gNB above the parent IAB node #1 1202 is also changed (or falls back) based on TDM, the IAB node #1 1204 That the DU resource has fallen back based on TDM may be reported to the parent IAB node #1 1202 or the gNB above the parent IAB node #1 1202 by means of an upper signal, a physical signal, or a backhaul signal.
  • the IAB node #1 (1204) receives another parent IAB node #1 (1202). ) Or the parent IAB node #2 (1203) overlapping with at least one DU resource type among the DU resources configured by the gNB above the parent IAB node #1 (1202) or the parent IAB node #2 (1203) above the parent IAB node #2 (1203) Only the DU resources configured by the gNB may be determined as available soft resources 1225.
  • IAB node # 1 1204 selects soft resources 1225 from soft resources 1225 in all frequency domains. Only the frequency domain overlapping with the resource 1223 in the frequency domain is determined as a soft resource, and the IAB node #1 (1202) is the soft resource domain with the parent IAB node #1 (1202) or parent IAB node #2 (1203). It may be determined that the DU of the IAB node #1 1204 can be transmitted/received without affecting the MT of the IAB node #1 1204 that transmits/receives.
  • IAB node #1 1204 uses soft resources 1225 among soft resources 1225 in all frequency domains. 1223 or the hard resource 1222 and all frequency domains overlapping in the frequency domain are determined as soft resources, and the IAB node #1 (1204) is the parent IAB node #1 (1202) or the parent IAB node in the soft resource domain.
  • DUs of IAB node #1 can be transmitted and received without affecting the MT of IAB node #1 (1204) that is transmitted and received with #2 (1203) (for example, within a line that does not affect the transmission and reception of MT) can judge As in the above embodiment, if it overlaps with any DU resource type, whether it can be determined as an available soft resource may be defined in the standard, and parent IAB node #1 (1202) or #2 (1203), parent IAB node #1 (1202 ) or #2 (1203), the information may be indicated by an upper level signal, a physical signal, or a backhaul signal by a higher level gNB and received in advance by the IAB node #1 (1204).
  • the IAB node #1 receives another parent IAB node #1 (1202). ) or the parent IAB node #2 (1203) or the parent IAB node #2 (1203) that does not overlap with at least one DU resource type among the DU resources configured by the gNB above the parent IAB node #1 (1202) Only DU resources configured by the present gNB may be determined as available soft resources 1225.
  • IAB node # 1 1204 NA among soft resources 1225 in all frequency domains Only the frequency domain other than the frequency domain overlapping the resource 1224 is determined as a soft resource, and the IAB node #1 (1202) is the parent IAB node #1 (1202) or the parent IAB node # in the soft resource domain. Determining that the DU of IAB node #1 (1204) can be transmitted/received without affecting the MT of IAB node #1 (1204) that is transmitted/received with node 2 (1203) (for example, within a line that does not affect the transmission/reception of MT) can do.
  • whether it can be determined as a soft resource available in the remaining frequency bands that do not overlap with any DU resource type may be defined in the standard, parent IAB node #1 (1202) or #2 (1203), parent IAB node
  • the information may be instructed by an upper level signal, a physical signal, or a backhaul signal by a gNB higher than #1 1202 or #2 1203 and received in advance by the IAB node #1 1204.
  • Which of the above-described embodiments can be applied may be defined in the standard, and above the parent IAB node #1 (1202) or #2 (1203) or the parent IAB node #1 (1202) or #2 (1203)
  • the information e.g., information related to which of the above embodiments can be applied
  • At least one or more of the above-described embodiments may be used in combination, and may be applied to some or all of the contents of the present disclosure.
  • FIG. 13 is a flowchart for explaining a method of configuring resources when an IAB node performs dual access according to an embodiment of the present disclosure.
  • the IAB node receives TDM, FDM, and SDM resource allocation information from an IAB donor, and receives a first resource allocation information from a first parent IAB node.
  • Resource scheduling information may be received, and second resource scheduling information may be received from a second parent IAB node.
  • the IAB node switches data transmission/reception resources with the first or second parent node to fallback based on the resource allocation information, the first resource scheduling information, and the second resource scheduling information. If it is, according to an embodiment of the present disclosure, the resource configuration with the first parent IAB node or the second parent IAB node is changed, and the first parent IAB node or the second parent IAB node, the child IAB node, or the terminal ( For example, data may be transmitted/received with at least one of terminals within a cell.
  • FIGS. 14 and 15 respectively illustrate a transmitter, a receiver, and a control unit of a terminal and a base station. 16 also shows the arrangement of an IAB node. 14 to 16 show a base station (Donor base station) that transmits and receives a backhaul link with an IAB node through mmWave when a backhaul link or an access link is transmitted and received through an IAB node in a 5G communication system corresponding to embodiments of the present disclosure.
  • a base station Donor base station
  • a transmission/reception method and a transmission/reception method of a terminal that transmits/receives an access link with an IAB node are shown, and to perform this, a transmission unit, a reception unit, and a processing unit of a base station, a terminal, and an IAB node may each operate according to an embodiment.
  • a terminal of the present disclosure may include a terminal control unit 1401 , a receiver 1402 , and a transmitter 1403 . also.
  • the terminal may further include a memory.
  • the components of the terminal are not limited to the example of FIG. 14 .
  • a terminal may include more or fewer components than the aforementioned components.
  • the terminal controller 1401, the receiver 1402, and the transmitter 1403 may be implemented as a single chip.
  • the terminal control unit 1401 may control a series of processes in which the terminal may operate according to the above-described embodiment of the present disclosure. For example, transmission and reception of an access link with an IAB node according to an embodiment of the present disclosure may be differently controlled.
  • the terminal control unit 1401 may transmit and receive information by controlling the terminal receiving unit 1402 and the terminal transmitting unit 1403 . Also, the terminal control unit 1401 may include one or more processors.
  • the terminal receiver 1402 and the terminal transmitter 1403 may be collectively referred to as transceivers in an embodiment of the present disclosure.
  • the transmitting/receiving unit may transmit/receive signals with the base station.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
  • the transmitting/receiving unit may receive a signal through a wireless channel, output the signal to the terminal control unit 1401, and transmit the signal output from the terminal control unit 1401 through the wireless channel.
  • a memory may store programs and data required for operation of the terminal. Also, the memory may store control information or data included in a signal obtained from the terminal.
  • the memory may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media.
  • the memory may not exist separately but may be included in the terminal control unit 1401.
  • the terminal control unit 1401 may control components of the terminal by executing a program stored in a memory.
  • the base station of the present disclosure may include a base station controller 1501 , a receiver 1502 , and a transmitter 1503 . also.
  • the base station may further include a memory.
  • components of the base station are not limited to the example of FIG. 15 .
  • a base station may include more or fewer components than those described above.
  • the base station controller 1501, the receiver 1502, and the transmitter 1503 may be implemented as a single chip.
  • the base station control unit 1501 can control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, transmission and reception of a backhaul link and transmission and reception of an access link with an IAB node according to an embodiment of the present disclosure may be differently controlled.
  • the base station control unit 1501 may control the base station receiving unit 1502 and the base station transmitting unit 1503 to transmit and receive information. Also, the base station control unit 1501 may include one or more processors.
  • the base station receiving unit 1502 and the base station transmitting unit 1503 may collectively be referred to as transceivers in an embodiment of the present disclosure.
  • the transmission/reception unit may transmit/receive signals with the terminal.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
  • the transceiver may receive a signal through a radio channel, output the signal to the base station controller 1501, and transmit the signal output from the base station controller 1501 through a radio channel.
  • a memory may store programs and data necessary for the operation of the base station. Also, the memory may store control information or data included in a signal obtained from the base station.
  • the memory may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media.
  • the memory may not exist separately and may be included in the base station control unit 1501.
  • the base station control unit 1501 may control components of the base station by executing a program stored in memory.
  • the IAB node of the present disclosure may include a base station function control unit 1601, a base station function receiving unit 1602, and a base station function transmitting unit 1603 of the IAB node for transmitting and receiving data to and from a lower IAB node through a backhaul link.
  • the IAB node initially connects to the upper IAB node and the donor base station, transmits and receives the upper signal before transmitting and receiving through the backhaul link, and the terminal function control unit 1611 of the IAB node for transmitting and receiving the backhaul link with the upper IAB node and the donor base station, the terminal function It may include a receiving unit 1612, a terminal function transmitting unit 1613, and the like. also.
  • the IAB node may further include a memory.
  • components of the IAB node are not limited to the example of FIG. 16 .
  • an IAB node may include more or fewer components than those described above.
  • each component shown in FIG. 16 may be implemented in the form of a single chip.
  • each of the base station function controller 1601 of the IAB node and the terminal function controller 1611 of the IAB node may include one or more processors.
  • the base station function controller 1601 of the IAB node can control a series of processes so that the IAB node can operate like a base station according to the above-described embodiment of the present disclosure.
  • the function of the DU of the IAB node described above can be done
  • the base station function controller 1601 may differently control transmission and reception of a backhaul link with a lower IAB node and transmission and reception of an access link with a terminal according to an embodiment of the present disclosure.
  • the base station function receiver 1602 and the base station function transmitter 1603 may collectively be referred to as transceivers in an embodiment of the present disclosure.
  • the transmission/reception unit may transmit/receive signals to/from lower IAB nodes and terminals.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
  • the transceiver may receive a signal through a radio channel, output the signal to the base station function controller 1601, and transmit the signal output from the base station function controller 1601 through a radio channel.
  • the terminal function controller 1611 of the IAB node can control a series of processes in which the lower IAB node can operate like a terminal for data transmission and reception with the Donor base station or the upper IAB node according to the above-described embodiment of the present disclosure, , for example, can perform the function of the MT of the IAB node described above.
  • the terminal function control unit 1611 may differently control transmission and reception of a backhaul link between a Donor base station and an upper IAB node according to an embodiment of the present disclosure.
  • the terminal function receiver 1612 and the terminal function transmitter 1613 may be collectively referred to as a transceiver in an embodiment of the present disclosure.
  • the transmitting/receiving unit may transmit/receive signals with the Donor base station and the upper IAB node.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
  • the transmitting/receiving unit may receive a signal through a wireless channel, output the signal to the terminal function controller 1611, and transmit the signal output from the terminal function controller 1611 through a wireless channel.
  • a memory may store programs and data necessary for the operation of the IAB node. Also, the memory may store control information or data included in a signal obtained from the IAB node.
  • the memory may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media.
  • the memory may not exist separately and may be included in the base station function controller 1601 of the IAB node and/or the terminal function controller 1611 of the IAB node.
  • the base station function controller 1601 of the IAB node and/or the terminal function controller 1611 of the IAB node may control components of the IAB node by executing a program stored in memory.
  • the base station function controller 1601 of the IAB node included in the IAB node of FIG. 16 and the terminal function controller 1611 of the IAB node may be integrated with each other and implemented as an IAB node controller.
  • the IAB node control unit can control the functions of the DU and MT together in the IAB node.
  • a computer readable storage medium storing one or more programs (software modules) may be provided.
  • One or more programs stored in a computer-readable storage medium are configured for execution by one or more processors in an electronic device.
  • the one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.
  • Such programs may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM.
  • EEPROM Electrically Erasable Programmable Read Only Memory
  • magnetic disc storage device Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these.
  • each configuration memory may include a plurality.
  • the program accesses through a communication network such as the Internet, an Intranet, a Local Area Network (LAN), a Wide LAN (WLAN), or a Storage Area Network (SAN), or a communication network composed of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.
  • a communication network such as the Internet, an Intranet, a Local Area Network (LAN), a Wide LAN (WLAN), or a Storage Area Network (SAN), or a communication network composed of a combination thereof. It can be stored on an attachable storage device that can be accessed.
  • Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port.
  • a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.
  • each of the above embodiments can be operated in combination with each other as needed.
  • a base station and a terminal may be operated by combining parts of one embodiment of the present disclosure and another embodiment.
  • embodiments of the present disclosure can be applied to other communication systems, and other modifications based on the technical ideas of the embodiments may also be implemented.

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

Abstract

La présente divulgation concerne : une technique de communication permettant de fusionner une technologie IdO avec un système de communication 5G permettant de prendre en charge un débit de transmission de données supérieur à celui d'un système 4G ; et un système associé. La présente divulgation peut être appliquée à des services intelligents (par exemple, des maisons intelligentes, des immeubles intelligents, des villes intelligentes, des voitures intelligentes ou des voitures connectées, des soins de santé, l'enseignement numérique, le commerce de détail, les services associés à la sécurité et à la sûreté et analogues) sur la base de la technologie de communication 5G et de la technologie relative à l'IdO. La présente divulgation concerne un système de communication sans fil et, plus particulièrement, un procédé et un appareil pour établir des ressources pour une connectivité double d'un nœud d'accès et de liaison terrestre intégrés (IAB).
PCT/KR2022/011011 2021-07-28 2022-07-27 Procédé et appareil pour établir des ressources de connectivité double d'un nœud iab dans un système de communication sans fil WO2023008897A1 (fr)

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KR1020210099269A KR20230017589A (ko) 2021-07-28 2021-07-28 무선 통신 시스템에서 iab 노드의 이중 접속 자원 설정 방법 및 장치
KR10-2021-0099269 2021-07-28

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021028015A1 (fr) * 2019-08-12 2021-02-18 Nokia Technologies Oy Résolution de conflit de double connectivité pour des unités distribuées

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WO2021028015A1 (fr) * 2019-08-12 2021-02-18 Nokia Technologies Oy Résolution de conflit de double connectivité pour des unités distribuées

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CEWIT, TEJAS NETWORKS, RELIANCE JIO, IITM, SAANKHYA LABS, IITH: "Discussion on simultaneous operation of IAB-node’s child and parent links", 3GPP DRAFT; R1-2105068, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210510 - 20210527, 12 May 2021 (2021-05-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP052011160 *
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HUAWEI, HISILICON: "Resource multiplexing between backhaul and access for IAB duplexing enhancements", 3GPP DRAFT; R1-2104246, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. E-meeting; 20210510 - 20210527, 12 May 2021 (2021-05-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP052010700 *
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