Method and device for reporting CGI information in next generation mobile communication system

Abstract

The present invention provides a method and a device in which a terminal determines whether a cell is a cell to be subject to dynamic ANR reporting on the basis of a PCI and dynamic ANR configuration information of a second base station-related cell, acquires cell global identifier (CGI) information of the cell when the cell is the cell to be subject to dynamic ANR reporting, and transmit a measurement report including the PCI and CGI information of the cell to a first base station.

Description

Method and device for reporting CGI information in next-generation mobile communication systems

[0001] The present invention relates to the operation of a terminal and a base station in a mobile communication system. More specifically, the present invention relates to a method and device for reporting a cell group ID (CGI) of a terminal.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band, such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave), such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and meet performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] The present disclosure proposes a method and device for reporting cell group ID (CGI) information in a next-generation mobile communication system to solve the above-described problems.

[0009] The technical problems to be achieved in the embodiments of the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0010] In order to solve the above problems, the present invention provides a method performed by a terminal in a wireless communication system, the method comprising: receiving, from a first base station, measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information; acquiring, from a cell associated with at least one second base station, a physical cell identifier (PCI) of at least one cell, the PCI being acquired through a reference signal (RS); determining, based on the acquired PCI and the Dynamic ANR configuration information, whether the at least one cell is a reporting target cell for Dynamic ANR; acquiring, when the at least one cell is a reporting target cell for Dynamic ANR, cell global identity (CGI) information of the at least one cell, the CGI information being acquired through a system information block (SIB); And characterized by including a step of transmitting a measurement report including PCI and CGI information of at least one cell to the first base station.

[0011] The present invention for solving the above problems is characterized by a method performed by a first base station in a wireless communication system, comprising the steps of: transmitting measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information to a terminal; receiving a measurement report (Measurement Report) including physical cell identifier (PCI) and cell global identifier (CGI) information of a cell related to at least one second base station from the terminal; and updating ANR information of the base station based on the received measurement report.

[0012] In order to solve the above problems, the present invention provides a terminal in a wireless communication system, comprising: a transceiver for transmitting and receiving signals; And a control unit, wherein the control unit receives measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information from a first base station, acquires a physical cell identifier (PCI) of at least one cell from a cell related to at least one second base station, acquires the PCI through a reference signal (RS), and determines whether the at least one cell is a target cell for reporting of Dynamic ANR based on the acquired PCI and the Dynamic ANR configuration information, and when the at least one cell is a target cell for reporting of Dynamic ANR, acquires Cell Global Identity (CGI) information of the at least one cell, acquires the CGI information through a system information block (SIB), and transmits a measurement report (Measurement Report) including PCI and CGI information of the at least one cell to the first base station.

[0013] In order to solve the above problems, the present invention comprises a base station in a wireless communication system, a transceiver for transmitting and receiving signals; and a control unit, wherein the control unit transmits measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information to a terminal, receives a measurement report (Measurement Report) including physical cell identifier (PCI) and cell global identifier (CGI) information of a cell related to at least one second base station from the terminal, and updates ANR information of the base station based on the received measurement report.

[0014] According to the present disclosure, there is an effect of updating automatic neighbor relation (ANR) information on a screen with minimal time delay in a wireless access backhaul (WAB) scenario.

[0015] The effects that can be obtained from the present disclosure are not limited to the effects mentioned in the various embodiments, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0016] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0017] FIG. 1b is a diagram for explaining a wireless connection state transition in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0018] FIG. 1c is a diagram for explaining an Automatic Neighbor Relation (ANR) operation in a mobile communication system according to an embodiment of the present disclosure.

[0019] FIG. 1d is a flowchart of an Automatic Neighbor Relation (ANR) operation in a mobile communication system according to an embodiment of the present disclosure.

[0020] FIG. 1e is a diagram for explaining an Automatic Neighbor Relation (ANR) operation in a wireless access backhaul (WAB) mobile communication system according to one embodiment of the present disclosure.

[0021] FIG. 1f is a flowchart illustrating a process in which a terminal performs an Automatic Neighbor Relation (ANR) operation with a WAB base station in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0022] FIG. 1g is a flowchart illustrating a process in which a terminal performs an Automatic Neighbor Relation (ANR) operation with a general fixed base station in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0023] FIG. 1h is a flowchart of terminal operations performing Automatic Neighbor Relation (ANR) in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0024] FIG. 1i is a flowchart of a base station operation performing Automatic Neighbor Relation (ANR) in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0025] FIG. 1J is a diagram for explaining a Logged Minimization of Drive Test (MDT) operation in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0026] FIG. 1k is a flowchart illustrating a process in which a terminal performs a Logged Minimization of Drive Test (MDT) operation in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0027] FIG. 11 is a flowchart of an operation of a wireless access backhaul (WAB) base station configuring a backhaul link with a fixed base station according to an embodiment of the present disclosure.

[0028] FIG. 1m is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0029] FIG. 1n is a block diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0030] The operating principles of the present invention will be described in detail below with reference to the attached drawings. In the following description of the present invention, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0031] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, and terms referring to various identification information are provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0032] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which the embodiments of the present disclosure may be applied, and 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure. It will be appreciated that each block of the processing flow diagrams and combinations of the flow diagrams can be executed by computer program instructions.

[0033] These computer program instructions may be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that the instructions executed by the processor of the computer or other programmable data processing apparatus create means for performing the functions described in the flowchart block(s). These computer program instructions may also be stored in a computer-available or computer-readable memory that can be directed to a computer or other programmable data processing apparatus to implement functions in a particular manner, so that the instructions stored in the computer-available or computer-readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flowchart block(s). The computer program instructions may also be installed on a computer or other programmable data processing apparatus, so that a series of operational steps are performed on the computer or other programmable data processing apparatus to create a computer-implemented process, so that the instructions executing on the computer or other programmable data processing apparatus can provide steps for performing the functions described in the flowchart block(s).

[0034] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function. In this case, the term '~unit' used in the present embodiment means software or a hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the '~unit' may perform certain roles. However, the '~unit' is not limited to software or hardware. The '~unit' may be configured to be on an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, the components and '~ units' may be implemented to reproduce one or more CPUs within a device or a secure multimedia card. Also, in an embodiment, the '~ unit' may include one or more processors.

[0035] For convenience of explanation, the present invention uses terms and names defined in the 5GS and NR standards, which are standards defined by the 3rd Generation Partnership Project (3GPP) among the existing communication standards. However, the present invention is not limited to the above terms and names and can be equally applied to wireless communication networks that follow other standards. For example, the present invention can be applied to the 3GPP 5GS / NR (5th generation mobile communication standard).

[0036] In the following description of the present invention, detailed descriptions of known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

[0037] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0038] Referring to Fig. 1a, as illustrated, a wireless access network of a next-generation mobile communication system (New Radio, NR) is composed of a next-generation base station (New Radio Node B, hereinafter referred to as gNB) (1a-10) and an AMF (1a-05, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter referred to as NR UE or terminal) (1a-15) can access an external network through the gNB (1a-10) and the AMF (1a-05).

[0039] In Figure 1a, the gNB corresponds to the eNB (Evolved Node B) of the existing LTE system. The gNB is connected to NR UEs via a wireless channel and can provide superior service compared to the existing Node B (1a-20). In the next-generation mobile communication system, all user traffic is serviced through a shared channel. Therefore, a device is required to collect status information such as the buffer status of UEs, available transmit power status, and channel status, and perform scheduling. This is handled by the gNB (1a-10). A single gNB can typically control multiple cells.

[0040] In order to implement ultra-high-speed data transmission compared to existing LTE, it can have a bandwidth exceeding the existing maximum, and beamforming technology can be additionally applied using orthogonal frequency division multiplexing (OFDM) as a wireless access technology.

[0041] Additionally, Adaptive Modulation & Coding (AMC) is applied, which determines the modulation scheme and channel coding rate according to the channel status of the terminal. AMF (1a-05) performs functions such as mobility support, bearer setup, and QoS setup.

[0042] The AMF, a device responsible for various control functions as well as mobility management for terminals, is connected to multiple base stations. Furthermore, the next-generation mobile communication system can be integrated with existing LTE systems, and the AMF can be connected to the Mobile Mobile Equipment (MME) (1a-25) via a network interface. The MME is connected to the existing base station, the eNB (1a-30). Terminals supporting LTE-NR Dual Connectivity can transmit and receive data while maintaining connectivity to both the gNB and the eNB (1a-35).

[0043] FIG. 1b is a diagram for explaining a wireless connection state transition in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0044] Next-generation mobile communication systems have three radio access states (RRC states).

[0045] Connected mode (RRC_CONNECTED, 1b-05) is a wireless connection state in which the terminal can transmit and receive data.

[0046] Standby mode (RRC_IDLE, 1b-30) is a wireless connection state in which the terminal monitors whether paging is being sent to it. These two modes are also applied to existing LTE systems, and the detailed technology is identical to that of existing LTE systems.

[0047] In next-generation mobile communication systems, a new inactive (RRC_INACTIVE) radio connection state (1b-15) has been defined. In this radio connection state, UE context is maintained between the base station and the terminal, and RAN-based paging is supported. The characteristics of this new radio connection state are listed below.

[0048] - Cell re-selection mobility;

[0049] - CN - NR RAN connection (both C / U-planes) has been established for UE;

[0050] - The UE AS context is stored in at least one gNB and the UE;

[0051] - Paging is initiated by NR RAN;

[0052] - RAN-based notification area is managed by NR RAN;

[0053] - NR RAN knows the RAN-based notification area which the UE belongs to;

[0054] The new INACTIVE wireless connection state can transition from connected mode to standby mode using specific procedures. The Resume procedure transitions from INACTIVE mode to connected mode, and the Release procedure, which includes the suspend configuration information, transitions from connected mode to INACTIVE mode (1b-10).

[0055] The above procedure involves transmitting and receiving one or more RRC messages between the terminal and the base station, and consists of one or more steps. Furthermore, the device can transition from INACTIVE mode to STANDBY mode through the Resume and Release procedures (1b-20).

[0056] Switching between connected and standby modes follows existing LTE technology, i.e., switching between the modes is performed through establishment or release procedures (1b-25).

[0057] FIG. 1c is a diagram for explaining an Automatic Neighbor Relation (ANR) operation in a mobile communication system according to an embodiment of the present disclosure.

[0058] In mobile communication systems, base stations, with the help of terminals, can identify surrounding cells. The process by which base stations collect information about neighboring cells from terminals is called Automatic Neighbor Relation (ANR) function. The information collected through ANR is stored by the network and can be widely utilized, including in determining cell configuration parameter values ​​and handover decisions.

[0059] For example, in order for a base station to set up a handover (HO) for a specific terminal, it must first negotiate the handover with a predetermined target cell. To do this, it must know which cells are around it. ANR information can include various information, such as information about neighboring cells, whether HO is possible with neighboring cells, and whether an X2 interface exists with neighboring cells.

[0060] A base station (1c-05) can request signal strength information of neighboring cells by setting cell measurement information to a terminal (1c-10). The terminal can receive a reference signal broadcast by a neighboring cell (1c-15) and report signal strength information and PCI (Physical Cell Id) information obtained thereby to the base station. If the base station receiving the information determines that the cell corresponding to the collected PCI is a cell that it has not previously recognized, the base station can request additional information about the cell from the terminal. The terminal receiving the request for additional information about the cell receives system information of the cell corresponding to the PCI, particularly system information block 1 (SIB1), and can obtain certain information from the SIB1, namely, Cell Global Id (CGI) information of the cell and public land mobile network (PLMN) information supported by the cell. The terminal that has obtained the information can transmit the same to the base station that requested the information. The base station can update its ANR information by reflecting the information about the cell. If the base station determines that a neighboring cell no longer exists based on internal information, it can delete the neighboring cell from the ANR information.

[0061] FIG. 1d is a flowchart of an Automatic Neighbor Relation (ANR) operation in a mobile communication system according to an embodiment of the present disclosure.

[0062] In step 1d-20, the terminal (user equipment, UE, 1d-05) can receive cell measurement configuration information (measConfig IE) included in the RRCReconfiguration message from the first base station (gNB1, 1d-10). (1d-20).

[0063] In step 1d-25, the terminal (1d-05) can measure predetermined frequencies according to the setting information. (1d-25).

[0064] In step 1d-30, the terminal (1d-05) can receive a reference signal (e.g., synchronization signal block, SSB) broadcast from a specific cell provided by the second base station (gNB2, 1d-15) (1d-30).

[0065] In step 1d-35, the terminal (1d-05) can report the cell's received signal strength information (e.g., reference signals received power (RSRP) / reference signals received quality (RSRQ)) and physical cell identity (PCI) information from the reference signal to the first base station (1d-10) using a MeasurementReport message. (1d-35)

[0066] In step 1d-40, the first base station (1d-10) that received the above information can recognize that the reported cell is not registered in its ANR. (1d-40)

[0067] In step 1d-45, the first base station (1d-10) may decide to update ANR information and request the terminal (1d-05) to report additional information about the cell of the second base station (1d-45). The request is indicated by setting the reportType field of the measConfig IE to reportCGI, and the field may include PCI information of the cell for which the terminal requires additional information.

[0068] The terminal (1d-05) that received the above request starts the T321 timer, and in step 1d-50, the terminal (1d-05) can additionally receive the master information block (MIB) and system information block 1 (SIB1) broadcasted by the cell of the second base station (1d-15). The SIB1 includes the cell global ID (CGI) information of the cell and the public land mobile network (PLMN) information that it supports.

[0069] In step 1d-55, the terminal (1d-05) can report the cgi-Info field, including the cell's CGI information and supported PLMN information, to the first base station (1d-10) using a MeasurementReport message. (1d-55). At this time, the terminal stops the running T321 timer. The information stored in the cgi-Info is as follows.

[0070]

[0071] In step 1d-65, the received MIB may indicate that SIB1 is not being broadcast, in which case the terminal (1d-05) may include an indicator "noSIB1" indicating the absence of SIB1 in the MeasurementReport message and report this to the first base station (1d-10). (1d-65) At this time, the terminal also stops the running T321 timer.

[0072] The terminal may not successfully receive the MIB, SIB1 until the T321 timer expires. If the timer expires, the terminal (1d-05) may transmit a MeasurementReport message to the first base station (1d-10) without the cgi-Info or noSIB1 indicator in step 1d-70. (1d-70).

[0073] According to the procedure described above, it takes a certain amount of time for the base station to recognize a new cell and obtain CGI-related information related to the new cell, which may result in a delay in updating ANR information for the new cell. However, since base stations typically do not move, the emergence of new neighboring cells is infrequent, except in specific cases such as the initial network construction or network reset. Therefore, a slight delay in updating ANR information may not significantly impact UE mobility support or network optimization.

[0074] FIG. 1e is a diagram for explaining an Automatic Neighbor Relation (ANR) operation in a wireless access backhaul (WAB) mobile communication system according to one embodiment of the present disclosure.

[0075] A Wireless Access Backhaul (WAB) is a type of mobile base station that wirelessly connects to a conventional fixed base station. Based on a CU-DU architecture, unlike a Mobile Integrated Access and Backhaul (IAB) node that acts as a DU, a WAB base station possesses both L2 and L3 (Layer 2 and Layer 3), offering the advantage of a simpler structure. A representative use case for WAB is the Vehicle Mounted Relay (VMR) installed in buses, trains, and airplanes.

[0076] Because WAB base stations are mobile, the surrounding cells will change frequently from the WAB's perspective. From the perspective of a fixed base station, a mobile WAB will also be viewed as a cell that suddenly appears and disappears. Therefore, both WABs and fixed base stations may require frequent ANR updates to account for mobile WAB base stations. For example, since a terminal may board or disembark a WAB-equipped vehicle, timely ANR updates are essential for seamless mobility support (e.g., handovers) for the terminal.

[0077] The conventional ANR procedure can also be applied in the WAB scenario. If a WAB base station (1e-05) is installed on a mobile device, information about new surrounding cells can be obtained through the terminal (1e-10) connected to the WAB base station (1e-05). Furthermore, the fixed base station (1e-15) can also recognize the newly appeared WABs in the surroundings and obtain relevant information through the terminal (1e-20) connected to it, regarding cells that are no longer detected. Based on the obtained information, the WAB and the fixed base station (1e-15) can update their ANR information. To support smooth terminal mobility, the WAB needs to timely delete neighboring cells that are no longer detected from the ANR. However, since the conventional ANR procedure requests information other than the cell global data (CGI) based on the physical cell identity (PCI) information of the new cell acquired in advance, it inevitably takes a certain amount of time until the ANR is finally updated. Considering the speed of mobile devices equipped with WAB base stations, this delay can significantly hinder terminal mobility. Furthermore, cells no longer detected must be promptly deleted from ANR information, but existing ANR procedures lack a mechanism to ensure this.

[0078] In this disclosure, we propose a Dynamic ANR procedure that can update ANR information in a timely manner while minimizing the aforementioned time delay in a WAB scenario. The Dynamic ANR procedure refers to an ANR procedure in which, when a terminal detects a new cell that is pre-configured, it acquires the master information block (MIB) and system information block 1 (SIB1) without an additional request from the base station, and reports cgi-Info information to the base station. By following this procedure, the base station can timely recognize the new cell and update the ANR accordingly.

[0079] FIG. 1f is a flowchart illustrating a process in which a terminal performs an Automatic Neighbor Relation (ANR) operation with a WAB base station in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0080] At step 1f-20, the first base station (gNB1, 1f-10), which is a wireless access backhaul (WAB), may decide to set a Dynamic ANR procedure for a specific terminal based on the terminal's capability information (1f-20).

[0081] In step 1f-25, the terminal (user equipment, UE, 1f-05) can receive cell measurement configuration information (measConfig IE) included in the RRCReconfiguration message from the first base station (1f-10). (1f-25).

[0082] In addition to the predefined configuration information, the above cell measurement configuration information may include configuration information required to perform Dynamic ANR. For example, when detecting a new cell, a list of cells (PCI list) that must report cgi-Info information (or part of it), and a frequency or frequency band to which the cells that must report cgi-Info information belong may be indicated. Since the mobile communication operator is aware of the PCI value range, frequency, or frequency band that it utilizes in advance, it will be able to configure the configuration information based on the above information. The PCI list may be provided for each Measurement Object (MO). Information on the frequency to which the cells that must report cgi-Info information belong may be indicated as a new indicator in the MeasObjectNR IE corresponding to the corresponding frequency. That is, when the terminal detects a new cell in the frequency band corresponding to the MeasObjectNR IE, it receives up to SIB1 of the cell, configures cgi-Info information, and reports it to the base station.

[0083] Alternatively, a list of frequencies indicated by the Absolute Radio Frequency Channel Number (ARFCN) may be provided to the UE. The cells that must report cgi-Info information can be applied not only to NR cells but also to long term evolution (LTE) cells. For LTE cells, the relevant configuration information may be included in the MeasObjectEUTRA IE. Unlike the conventional ANR procedure, even if the UE receives the configuration information, the T321 timer is not triggered.

[0084] In step 1f-30, the terminal (1f-05) can measure predetermined frequencies according to the setting information. (1f-30).

[0085] In step 1f-35, the terminal (1f-05) can receive a reference signal (e.g., SSB) broadcast from a specific cell provided by the second base station (1f-15). (1f-35). The terminal (1f-05) can recognize PCI information and the detected frequency from the received reference signal.

[0086] In step 1f-40, the terminal (1f-05) can determine whether the PCI information or frequency belongs to a cell or frequency that must report cgi-Info information (1f-40), and if so, can also receive SIB1 broadcast from the cell (1f-45). When the terminal detects a cell that must report cgi-Info information or receives SIB1 from the cell, a new first timer can be started.

[0087] In step 1f-50, the terminal (1f-05) can transmit a MeasurementReport message including cell measurement results, PCI information, CGI information, and supported PLMN information to the first base station (1f-10). (1f-50). The MeasurementReport message including the above information can be reported to the first base station (1f-10) immediately after acquiring cgi-Info information, or when a predetermined preset Measurement Event is satisfied. The MeasurementReport message may include cgi-Info information for multiple cells. For example, the terminal can detect multiple new cells simultaneously. In this case, according to the above procedure, it is necessary to include cgi-Info information for multiple new cells in one MeasurementReport message. However, receiving SIB1 from multiple cells requires a predetermined amount of time. Therefore, according to a predetermined rule, only cgi-Info information for a limited number of new cells can be collected and included in the MeasurementReport message. For example, the predetermined rule may be as follows.

[0088] 1) Option 1: Up to N new cells with the best signal strength, where N is a fixed value or a value set by the base station.

[0089] 2) Option 2: Up to N new cells exceeding (or equal to) a specific signal strength threshold. N and the threshold are fixed values ​​or values ​​set by the base station.

[0090] 3) Option 3: Up to N new cells, with the highest priority set by the serving base station. The priorities can be assigned on a cell-by-cell, frequency-by-frequency, or frequency-by-frequency band basis. N can be a fixed value or a value set by the base station.

[0091] cgi-Info information for new unreported cells may be included in a subsequently transmitted MeasurementReport.

[0092] In step 1f-55, if the first base station (1f-10) that received the information recognizes that the reported cell is not registered in its ANR, the first base station can update the ANR information. At this time, the terminal (1f-05) stops the first timer that is running. The received MIB may indicate that SIB1 is not being broadcast, and in this case, the terminal may include an indicator "noSIB1" indicating that there is no SIB1 in the MeasurementReport message and report it to the first base station (1f-10). (1f-60) At this time as well, the terminal stops the first timer that is running.

[0093] If the first timer starts running when detecting a cell that needs to report cgi-Info information, the terminal may not successfully receive the MIB, SIB1 until the first timer expires. If the timer expires, in step 1f-65, the terminal (1f-05) may transmit a MeasurementReport message to the first base station (1f-10) without the cgi-Info or noSIB1 indicator. (1f-65).

[0094] Since the first base station (1f-10) is a WAB, it can move, and the cells registered in the ANR information may no longer be adjacent. Therefore, the cell must be promptly deleted from the ANR information to exclude it from the cells considered when configuring cell measurement or handover. If an adjacent cell moves away from the WAB base station, the received signal strength of the cell measured by terminals connected to the WAB base station will also weaken. Therefore, the WAB base station can recognize that an adjacent cell has moved away based on the cell measurement results stored in the MeasurementReport reported by the terminals, and can update the ANR information accordingly.

[0095] The above MeasurementReport message can be event-triggered or reported to the base station periodically. Among the predefined measurement events, there is no measurement event that triggers a MeasurementReport message when the signal strength of a neighboring cell weakens. Therefore, the terminal may not be able to immediately transmit the MeasurementReport message when the signal strength of the neighboring cell weakens. To address this issue, the present disclosure defines the following new measurement event.

[0096]

[0097] That is, when the received signal measurement value (received signals received power (RSRP) or received signals received quality (RSRQ)) of a preset neighboring cell becomes worse than a preset threshold (the ax-threshold), the terminal can transmit a MeasurementReport message to the base station. The threshold is set by the base station, and Hysteresis and TimeToTrigger (TTT) information can also be set.

[0098] If the above Event Ax is set to the terminal in advance, when the above condition (the entering or leaving condition) is satisfied, in step 1f-70, the terminal (1f-05) can transmit a MeasurementReport message to the first base station (1f-10). The MeasurementReport message triggered by the Event Ax may include CGI information of the adjacent cell corresponding to the Event Ax.

[0099] In step 1f-75, the first base station (1f-10) that received the message may recognize that a specific cell is no longer a neighboring cell based on the cell measurement result included in the message, and may exclude the cell from ANR information in response thereto.

[0100] FIG. 1g is a flowchart illustrating a process in which a terminal performs an Automatic Neighbor Relation (ANR) operation with a general fixed base station in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0101] In step 1g-20, the first base station (gNB1, 1g-10) may decide to set a Dynamic ANR procedure for a specific terminal based on the terminal's capability information (1g-20).

[0102] In step 1g-25, a terminal (user equipment, UE, 1g-05) may receive cell measurement configuration information (measConfig IE) included in an RRCReconfiguration message from a first base station (1g-10). (1g-25). In addition to predefined configuration information, the cell measurement configuration information may additionally include configuration information necessary to perform Dynamic ANR. For example, when detecting a new cell, a list of cells (PCI list) that must report cgi-Info information (or part of the information), and frequencies or frequency bands to which cells that must report cgi-Info information belong may be indicated. Since a mobile communication service provider is aware of the PCI value range, frequencies, or frequency bands that it utilizes in advance, it may be able to configure the configuration information based on the information. The PCI list may be provided for each Measurement Object (MO). Information on the frequencies to which cells that must report cgi-Info information belong may be indicated as a new indicator in the MeasObjectNR IE corresponding to the corresponding frequency. That is, when a new cell is detected in a frequency band corresponding to the MeasObjectNR IE, the terminal receives up to SIB1 of the cell, configures cgi-Info information, and reports it to the base station.

[0103] Alternatively, a list of frequencies indicated by the Absolute Radio Frequency Channel Number (ARFCN) may be provided to the UE. The cells that must report cgi-Info information can be applied not only to NR cells but also to long term evolution (LTE) cells. For LTE cells, the relevant configuration information may be included in the MeasObjectEUTRA IE. Unlike the conventional ANR procedure, even if the UE receives the configuration information, the T321 timer is not triggered.

[0104] In step 1g-30, the terminal (1g-05) can measure predetermined frequencies according to the setting information. (1g-30).

[0105] In step 1g-35, the terminal (1g-05) can receive a reference signal (e.g., SSB) broadcast from a specific cell provided by the second base station (1g-15). (1g-35). The terminal (1g-05) can recognize PCI information and the detected frequency from the received reference signal.

[0106] In step 1g-40, the terminal (1g-05) determines whether the PCI information or frequency belongs to a cell or frequency that must report cgi-Info information (1g-40), and if so, can also receive SIB1 broadcast from the cell (1g-45). When the terminal (1g-05) detects a cell that must report cgi-Info information or receives SIB1 from the cell, a new first timer may be started. At this time, the second base station (1g-15), which is a WAB, includes an indicator indicating that it is a WAB in the SIB1 that it broadcasts. Alternatively, the indicator may be included in the MIB. Through the indicator, the terminal recognizes that the second base station is a WAB. At this time, the terminal can transmit a MeasurementReport message including cell measurement results, PCI information, CGI information, supported PLMN information, and indicator information indicating that the second base station (or the cell of the second base station) is a WAB to the first base station (1g-50).

[0107] The MeasurementReport message including the above information can be reported to the first base station immediately after acquiring the cgi-Info information, or when a predetermined Measurement Event is satisfied. In step 1g-55, if the first base station (1g-10) that has received the information recognizes that the reported cell is not registered in its ANR, the first base station (1g-10) can update the ANR information. (1g-55). At this time, the terminal stops the first timer that is running. The received MIB may indicate that SIB1 is not being broadcast, and in this case, in step 1g-60, the terminal (1g-05) can include an indicator "noSIB1" indicating that there is no SIB1 in the MeasurementReport message and report it to the first base station (1g-10). (1g-60). At this time, the terminal (1g-05) stops the first timer that is being operated.

[0108] If the first timer starts running when detecting a cell that needs to report cgi-Info information, the terminal (1g-05) may not successfully receive the MIB, SIB1 until the first timer expires. If the timer expires, the terminal (1g-05) may transmit a MeasurementReport message to the first base station (1g-10) without the cgi-Info or noSIB1 indicator. (1g-65).

[0109] The first base station (1g-10) may be such that the second base station (1g-15), which is a WAB, may move, and the cell of the second base station registered in the ANR information may no longer be adjacent. Therefore, the cell should be deleted from the ANR information in a timely manner, and excluded from the cells considered when measuring cells or setting up handover. When the adjacent second WAB base station moves away from the first base station, the received signal strength of the cell measured by the terminals connected to the first base station will also weaken. Therefore, the WAB base station can recognize that the adjacent cell has moved away based on the cell measurement results stored in the MeasurementReport reported from the terminals, and can update the ANR information accordingly. In order to receive a MeasurementReport message in a timely manner when the signal strength of the WAB base station weakens, the first base station can set the proposed new measurement event Ax to the terminal.

[0110] When the received signal measurement value (reference signals received power (RSRP) or reference signals received quality (RSRQ)) of a preset neighboring cell worsens below a preset threshold (the ax-threshold), the terminal can transmit a MeasurementReport message to the base station. The threshold is set by the base station, and Hysteresis and TimeToTrigger (TTT) information are also set.

[0111] If the above Event Ax is set to the terminal in advance, when the above condition (entering or leaving condition) is satisfied, the terminal (1g-05) can transmit a MeasurementReport message to the first base station (1g-10). (1g-70).

[0112] In step 1g-75, the first base station (1g-10) that received the message can recognize that a specific cell is no longer a neighboring cell based on the cell measurement result included in the message, and can exclude the cell from ANR information in response thereto (1g-75).

[0113] FIG. 1h is a flowchart of terminal operations performing Automatic Neighbor Relation (ANR) in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0114] In step 1h-05, the terminal may report its capability information to the serving base station. The capability information may include an indicator indicating that the terminal supports the Dynamic ANR procedure proposed in this disclosure.

[0115] In step 1h-10, the terminal may receive an RRCReconfiguration message from the serving base station. The message includes cell measurement configuration information (measConfig IE), and the cell measurement configuration information may include, in addition to predefined configuration information, additional configuration information required to perform Dynamic ANR.

[0116] In step 1h-15, the terminal can measure predetermined frequencies according to the setting information.

[0117] In step 1h-20, the terminal receives a reference signal (e.g., synchronization signal block. SSB) broadcast from a specific cell provided by a new neighboring base station.

[0118] At step 1h-25, the terminal can recognize that the detected cell is a cell that must report cgi-Info information according to the received Dynamic ANR setting information.

[0119] At step 1h-30, the terminal can also receive SIB1 broadcast from the adjacent cell.

[0120] In step 1h-35, the terminal transmits a MeasurementReport message including cell measurement results, physical cell Id (PCI) information, cell global identity (CGI) information, and supported public land mobile network (PLMN) information to the serving base station.

[0121] At step 1h-40, the terminal transmits a MeasurementReport message to the serving base station when the preset condition Event Ax is satisfied.

[0122] FIG. 1i is a flowchart of a base station operation performing Automatic Neighbor Relation (ANR) in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0123] In step 1i-05, the base station may receive capability information from the terminal. The capability information may include an indicator indicating that the base station supports the Dynamic ANR procedure proposed in this disclosure.

[0124] In step 1i-10, the base station may transmit an RRCReconfiguration message to the terminal. The message includes cell measurement configuration information (measConfig IE), and the cell measurement configuration information may include, in addition to predefined configuration information, additional configuration information required to perform Dynamic ANR.

[0125] In step 1i-15, the base station receives a MeasurementReport message including cell measurement results, physical cell Id (PCI) information, cell global Id (CGI) information, and supported public land mobile network (PLMN) information from the terminal.

[0126] In step 1i-20, the base station recognizes that the specific cell indicated in the message is not registered in the ANR information, and adds the cell information to the ANR information.

[0127] At step 1i-25, the base station can receive a MeasurementReport message triggered by a new measurement event.

[0128] At step 1i-30, the base station may recognize that the specific cell indicated in the message is no longer adjacent and may exclude the cell from the ANR information.

[0129] FIG. 1J is a diagram for explaining a Logged Minimization of Drive Test (MDT) operation in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0130] To optimize the network, the network can configure terminals to perform a Logged MDT (Minimization of Drive Test) operation. Logged MDT is a process in which terminals collect certain information while in standby or inactive mode and report this information to the network in connected mode. The network, upon receiving this information, utilizes it for network optimization.

[0131] A terminal (1j-10) performing logged MDT can typically collect cell measurement information and PCI information from neighboring cells. At this time, the terminal does not collect CGI information because it does not receive SIB1 from the neighboring cells. A WAB cell can broadcast an indicator indicating that it is a WAB in the MIB or SIB1.

[0132] In one embodiment of the present disclosure, it is proposed that a terminal receives SIB1 of neighboring cells, collects CGI information of the neighboring cells (1j-15, 1j-20) and information indicating that the neighboring cell is a WAB, and reports the collected information to the network. In addition, it is proposed that when a terminal performing logged MDT camps on a WAB cell (1j-05), it stores information indicating that the current serving cell is a WAB, and reports this to the network in a connected mode.

[0133] FIG. 1k is a flowchart illustrating a process in which a terminal performs a Logged Minimization of Drive Test (MDT) operation in a wireless access backhaul (WAB) mobile communication system according to an embodiment of the present disclosure.

[0134] In step 1k-17, the terminal (user equipment, UE, 1k-05) may report its capability information to the first base station (gNB1, 1k-10) (1k-17). The capability information may include an indicator indicating that the terminal is capable of collecting and reporting WAB-related information and cgi-Info information (or a portion thereof) in logged MDT operation.

[0135] In step 1k-20, the first base station (1k-10) may transmit a LoggedMeasurementConfiguration message to the terminal to set up a Logged MDT operation. (1k-20).

[0136] The above message may indicate a list of cells (PCI list) for which cgi-Info information (or part thereof) is to be collected for the measured adjacent cells, and the frequency or frequency band to which the cells for which cgi-Info information is to be collected belong. In addition, information indicating whether the cell camped on in standby or inactive mode is a WAB may be set to be stored.

[0137] In step 1k-25, the terminal (1k-05) receives an RRCRelease message from the first base station (1k-10) and switches to standby mode or inactive mode (1k-25).

[0138] In step 1k-30, the terminal (1k-05) measures predetermined frequencies according to predetermined setting information (1k-30).

[0139] In step 1k-35, the terminal (1k-05) can receive a reference signal (e.g., SSB) broadcast from a specific cell provided by the second base station (1k-15). (1k-35). The terminal (1k-05) can recognize PCI information and the detected frequency from the received reference signal.

[0140] In step 1k-45, the terminal (1k-05) can determine whether the PCI information or frequency belongs to a cell or frequency that must report cgi-Info information (1k-40), and if so, can also receive SIB1 broadcast from the cell (1k-45).

[0141] The above SIB1 contains the CGI information of the cell and information indicating whether it is a WAB. The terminal stores the following information (1k-50).

[0142] - cgi-Info or part of it

[0143] - The received MIB may indicate that SIB1 is not being broadcast, in which case the terminal may indicate that there is no SIB1 with the indicator "noSIB1" information.

[0144] - Indicator information indicating whether the adjacent cell is a WAB

[0145] When the terminal receives SIB1, it can also obtain PLMN information supported by the cell broadcasting the SIB1. The PLMN indicated in the information may be different from the PLMN supported by the cell that provided the LoggedMeasurementConfiguration message, or the PLMN information indicated in the LoggedMeasurementConfiguration message (a list of PLMNs to which the Logged MDT operation (collection and reporting) applies). For example, a mobile communication service provider may want to collect Logged MDT information only for the cells it has established. Accordingly, the terminal may not need to store the proposed new information at least for cells among neighboring cells that do not correspond to at least one of the PLMNs mentioned above.

[0146] Additionally, in standby or inactive mode, the terminal stores information indicating whether the serving cell it is camping on is a WAB.

[0147] The above information can be reported to the network when the terminal switches to connected mode. The network, which collects this information, can determine the trajectory of the moving WAB and the impact of the WAB at a specific location.

[0148] FIG. 11 is a flowchart of an operation of a wireless access backhaul (WAB) base station configuring a backhaul link with a fixed base station according to an embodiment of the present disclosure.

[0149] A mobile WAB base station (1l-05) must be wirelessly connected to an adjacent fixed RAN (Fixed gNB, 1l-10) to provide wireless data services to surrounding terminals. The WAB base station can identify the optimal surrounding fixed RAN for wireless backhaul through the aforementioned ANR procedure or its own surrounding cell measurement operation (1l-15).

[0150] In steps 11-20 and / or 11-25, the WAB base station (11-05) may receive SSB and SIB transmitted from the fixed RAN (11-10) (11-20, 11-25). The received SIB includes an indicator indicating whether the fixed RAN allows access for wireless backhaul purposes for the WAB.

[0151] If the above WAB base station (11-05) satisfies certain conditions, it can transmit a preamble to the fixed RAN (11-10) in step 11-30. (11-30). A dedicated preamble for WAB access may also be set, and in this case, it can be provided to the WAB base station through System Information.

[0152] In step 1l-35, the fixed RAN (1l-10) that received the preamble can transmit a random access response (RAR) message. (1l-35).

[0153] In step 11-40, the WAB base station (11-05) that received the RAR message can transmit a Msg3 message to the fixed RAN (11-10). (11-40). The MAC PDU containing the message can include predetermined LCID information indicating WAB access. The predetermined RRC message included in the Msg3 message can include cause information indicating WAB access, and can also include CGI information and PLMN information of the WAB cell.

[0154] In step 1l-45, the fixed RAN (1l-10) that received the Msg3 message can transmit a Msg4 message for contention resolution. (1l-45).

[0155] In step 11-50, the WAB base station (11-10) may, after receiving the Msg4 message, request necessary wireless backhaul resources for the terminals to which it provides data services using a predetermined RRC message or NAS message (11-50). The amount of wireless resources requested may also be expressed in the form of required QoS information.

[0156] In step 11-55, the fixed RAN (11-10) that received the request may notify acceptance of the request using a predetermined RRC message or NAS message (11-55). A separate frequency or BWP may also be set for the wireless backhaul resource.

[0157] Alternatively, after receiving the Msg4 message, a separate radio interface may be established between the WAB and the fixed RAN. This radio interface may be IP-based. In this case, the Msg4 message may include information necessary to configure the radio interface.

[0158] FIG. 1m is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0159] Referring to the above drawing, the terminal may include an RF (Radio Frequency) processing unit (1m-10), a baseband processing unit (1m-20), a storage unit (1m-30), and a control unit (1m-40).

[0160] The RF processing unit (1m-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1m-10) up-converts the baseband signal provided from the baseband processing unit (1m-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1m-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In the drawing, only one antenna is illustrated, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (1m-10) may include multiple RF chains. Furthermore, the RF processing unit (1m-10) may perform beamforming. For the above beamforming, the RF processing unit (1m-10) can adjust the phase and size of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit can perform MIMO and receive multiple layers when performing the MIMO operation.

[0161] The baseband processing unit (1m-20) performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (1m-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (1m-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (1m-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (1m-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols by performing an inverse fast Fourier transform (IFFT) operation and inserting a cyclic prefix (CP). In addition, when receiving data, the baseband processing unit (1m-20) divides the baseband signal provided from the RF processing unit (1m-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform) operation, and then restores the received bit string through demodulation and decoding.

[0162] The baseband processing unit (1m-20) and the RF processing unit (1m-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1m-20) and the RF processing unit (1m-10) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (1m-20) and the RF processing unit (1m-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit (1m-20) and the RF processing unit (1m-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Additionally, the different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band and a millimeter wave (mm wave) (e.g., 60GHz) band.

[0163] The storage unit (1m-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (1m-30) can store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (1m-30) provides the stored data upon request from the control unit (1m-40).

[0164] The control unit (1m-40) controls the overall operations of the terminal. For example, the control unit (1m-40) transmits and receives signals through the baseband processing unit (1m-20) and the RF processing unit (1m-10). In addition, the control unit (1m-40) records and reads data in the storage unit (1m-40). For this purpose, the control unit (1m-40) may include at least one processor. For example, the control unit (1m-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0165] FIG. 1n is a block diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0166] As shown in the above drawing, the base station may be configured to include an RF processing unit (1n-10), a baseband processing unit (1n-20), a backhaul communication unit (1n-30), a storage unit (1n-40), and a control unit (1n-50).

[0167] The RF processing unit (1n-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1n-10) up-converts the baseband signal provided from the baseband processing unit (1n-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1n-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In the drawing, only one antenna is shown, but the first access node may have multiple antennas. In addition, the RF processing unit (1n-10) may include multiple RF chains. Furthermore, the RF processing unit (1n-10) may perform beamforming. For the above beamforming, the RF processing unit (1n-10) can adjust the phase and magnitude of each signal transmitted and received through multiple antennas or antenna elements. The RF processing unit can perform a downlink MIMO operation by transmitting one or more layers.

[0168] The baseband processing unit (1n-20) performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (1n-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (1n-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (1n-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (1n-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit (1n-20) divides the baseband signal provided from the RF processing unit (1n-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT operation, and then restores the received bit string through demodulation and decoding. The baseband processing unit (1n-20) and the RF processing unit (1n-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1n-20) and the RF processing unit (1n-10) may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0169] The above backhaul communication unit (1n-30) provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (1n-30) converts a bit string transmitted from the main base station to another node, such as an auxiliary base station or core network, into a physical signal, and converts a physical signal received from the other node into a bit string.

[0170] The storage unit (1n-40) stores data such as basic programs, application programs, and setting information for the operation of the main base station. In particular, the storage unit (1n-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. In addition, the storage unit (1n-40) can store information that serves as a judgment criterion for whether to provide or terminate multiple connections to a terminal. In addition, the storage unit (1n-40) provides the stored data at the request of the control unit (1n-50).

[0171] The control unit (1n-50) controls the overall operations of the base station. For example, the control unit (1n-50) transmits and receives signals through the baseband processing unit (1n-20) and the RF processing unit (1n-10) or through the backhaul communication unit (1n-30). In addition, the control unit (1n-50) records and reads data in the storage unit (1n-40). For this purpose, the control unit (1n-50) may include at least one processor.

[0172] The methods according to the embodiments described in the claims or specification of the present invention may be implemented in the form of hardware, software, or a combination of hardware and software.

[0173] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present invention.

[0174] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0175] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present invention via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present invention.

[0176] In the specific embodiments of the present invention described above, components included in the invention are expressed in the singular or plural form depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present invention is not limited to singular or plural components. Even components expressed in the plural form may be composed of singular elements, or even components expressed in the singular form may be composed of plural elements.

[0177] While the detailed description of the present invention has described specific embodiments, it is clear that various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims but also by equivalents thereof.

Claims

1. A method performed by a terminal in a wireless communication system, A step of receiving measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information from a first base station; A step of obtaining a physical cell identity (PCI) of at least one cell from a cell associated with at least one second base station, wherein the PCI is obtained through a reference signal (RS); A step of determining whether at least one cell is a reporting target cell of Dynamic ANR based on the acquired PCI and Dynamic ANR setting information; If at least one of the above cells is a target cell for reporting of Dynamic ANR, a step of obtaining cell global identity (CGI) information of the at least one cell, the CGI information being obtained through a system information block (SIB); and A method characterized by comprising the step of transmitting a Measurement Report including PCI and CGI information of at least one cell to the first base station.

2. In paragraph 1, A method characterized in that the above Dynamic ANR setting information includes a list of cells regarding a reporting target of Cell Global Identity (CGI) information and information regarding a frequency that includes a cell regarding a reporting target of CGI information.

3. In paragraph 1, The first timer starts running when the above reference signal is received or the above system information block is acquired. A method characterized in that the first timer is stopped from operating after transmitting the measurement report.

4. In paragraph 1, A method characterized in that the second base station is a wireless access backhaul (WAB) including Layer 3 (L3).

5. In paragraph 1, A method, characterized in that the above system information block further includes information indicating that the second base station is a WAB base station.

6. In paragraph 1, A method characterized in that the above measurement report is transmitted when the received signal value of an adjacent cell is below a specific threshold value.

7. A method performed by a first base station in a wireless communication system, A step of transmitting measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information to a terminal; A step of receiving a measurement report including physical cell identifier (PCI) and cell global identifier (CGI) information of a cell related to at least one second base station from the terminal; and A method characterized by comprising a step of updating ANR information of a base station based on the received measurement report.

8. In paragraph 7, The above Dynamic ANR setting information includes a list of cells regarding the reporting target of Cell Global Identity (CGI) information, information regarding the frequency that includes the cell regarding the reporting target of CGI information, and The above second base station is a wireless access backhaul (WAB) including Layer 3 (L3), A method characterized in that the above measurement report is received when the received signal value of an adjacent cell is below a specific threshold value.

9. In a terminal in a wireless communication system, A transceiver for transmitting and receiving signals; and A control unit is included, wherein the control unit comprises: From the first base station, measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information is received, Obtaining a physical cell identity (PCI) of at least one cell from a cell associated with at least one second base station, wherein the PCI is obtained through a reference signal (RS), Based on the above-mentioned acquired PCI and Dynamic ANR setting information, it is determined whether at least one cell is a reporting target cell of Dynamic ANR, If at least one of the above cells is a target cell for reporting of Dynamic ANR, the Cell Global Identity (CGI) information of the at least one cell is obtained, and the CGI information is obtained through a System Information Block (SIB). A terminal characterized by transmitting a measurement report including PCI and CGI information of at least one cell to the first base station.

10. In paragraph 9, A terminal characterized in that the above Dynamic ANR setting information includes a list of cells regarding a reporting target of Cell Global Identity (CGI) information and information regarding a frequency that includes a cell regarding a reporting target of CGI information.

11. In paragraph 9, The first timer starts running when the above reference signal is received or the above system information block is acquired. A terminal characterized in that the above first timer stops operating after transmitting the measurement report.

12. In paragraph 9, The above second base station is a wireless access backhaul (WAB) including Layer 3 (L3), A terminal, characterized in that the above system information block further includes information indicating that the second base station is a WAB base station.

13. In paragraph 9, A terminal characterized in that the above measurement report is transmitted when the received signal value of an adjacent cell is below a specific threshold value.

14. In the first base station in a wireless communication system, A transceiver for transmitting and receiving signals; and A control unit is included, wherein the control unit comprises: Transmit measurement configuration information (measConfig) including dynamic Automatic Neighbor Relation (ANR) configuration information to the terminal, Receive a measurement report including physical cell identifier (PCI) and cell global identifier (CGI) information of at least one cell related to a second base station from the terminal, A first base station characterized by updating ANR information of the base station based on the above-mentioned received measurement report.

15. In paragraph 14, The above Dynamic ANR setting information includes a list of cells regarding the reporting target of Cell Global Identity (CGI) information, information regarding the frequency that includes the cell regarding the reporting target of CGI information, and The above second base station is a wireless access backhaul (WAB) including Layer 3 (L3), The first base station, characterized in that the above measurement report is received when the received signal value of an adjacent cell is below a specific threshold value.

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