Method and apparatus for acquiring system information in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. In addition, the present disclosure relates to a method performed by a terminal in a wireless communication system, and an apparatus for performing same, the method comprising the steps of: receiving a master information block (MIB) from a base station; determining, on the basis of information included in the MIB, reception of cell-based system information block 1 (SIB1) and / or area-based SIB1; and receiving, on the basis of the determination, the cell-based SIB1 and / or the area-based SIB1.

Description

Method and device for acquiring system information in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a mobile communication system. Additionally, the present disclosure relates to a method and apparatus for obtaining system information in a wireless communication system.

[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 frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

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

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

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas to guarantee coverage in the terahertz band of 6G mobile communication technology; metamaterial-based lenses and antennas; high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM); and Reconfigurable Intelligent Surface (RIS) technology to improve terahertz band signal coverage; as well as full-duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and Artificial Intelligence (AI) from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] The technical problem to be achieved in the embodiments of the present disclosure is to provide improved operation of a terminal and a base station in a wireless communication system.

[0009] In addition, the technical problem to be achieved in the embodiments of the present disclosure is to provide a method and apparatus for acquiring system information in a wireless communication system.

[0010] In addition, the technical problem to be achieved in the embodiments of the present disclosure is to propose a method to reduce the frequency of acquiring system information (e.g., SIB1), thereby efficiently managing the energy consumption of terminals and base stations and providing a method and apparatus to reduce network overhead.

[0011] The technical problems to be solved in the embodiments of the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0012] According to one embodiment of the present disclosure, a method performed by a terminal in a wireless communication system comprises: receiving a master information block (MIB) from a base station; determining to receive at least one of a cell-based system information block (SIB1) or an area-based SIB1 based on information contained in the MIB; and receiving at least one of the cell-based SIB1 or the area-based SIB1 based on the determination.

[0013] Additionally, according to one embodiment of the present disclosure, a method performed by a base station in a wireless communication system comprises: a step of broadcasting a master information block (MIB); a step of determining a broadcast for at least one of a requested cell-based system information block (SIB1) or an area-based SIB1 based on information contained in the MIB; and a step of broadcasting at least one of the cell-based SIB1 or the area-based SIB1 based on the determination.

[0014] Additionally, according to one embodiment of the present disclosure, a terminal of a wireless communication system comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and a memory connected to communicate with the at least one processor and executable individually or in any combination of the at least one processor, wherein the terminal receives a master information block (MIB) from a base station, determines reception of at least one of a cell-based system information block (SIB1) or an area-based SIB1 based on information contained in the MIB, and stores an instruction to receive at least one of the cell-based SIB1 or the area-based SIB1 based on the determination.

[0015] Additionally, according to one embodiment of the present disclosure, a base station of a wireless communication system comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and a memory connected to communicate with the at least one processor and executable individually or in any combination of the at least one processor, wherein the base station broadcasts a master information block (MIB), determines a broadcast for at least one of a requested cell-based system information block (SIB1) or area-based SIB1 based on information contained in the MIB, and stores an instruction to broadcast at least one of the cell-based SIB1 or area-based SIB1 based on the determination.

[0016] According to various embodiments of the present disclosure, improved operation of a terminal and a base station in a wireless communication system can be provided.

[0017] In addition, according to various embodiments of the present disclosure, a method and apparatus for obtaining system information in a wireless communication system may be provided.

[0018] In addition, according to various embodiments of the present disclosure, a method and apparatus can be provided to efficiently manage energy consumption of terminals and base stations and reduce network overhead by proposing a method to reduce the frequency of acquiring system information (e.g., SIB1).

[0019] The effects obtainable in the present disclosure are not limited to those mentioned in the various embodiments, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below.

[0020] FIG. 1 is a drawing illustrating the structure of a next-generation mobile communication system according to one embodiment of the present disclosure.

[0021] FIG. 2 is a diagram illustrating a method for providing system information in an NR mobile communication system according to one embodiment of the present disclosure.

[0022] FIG. 3 illustrates the process of a moving terminal updating system information in an NR mobile communication system according to one embodiment of the present disclosure.

[0023] FIG. 4 is a diagram illustrating the process of selecting msg1-based and msg3-based SI request methods according to one embodiment of the present disclosure.

[0024] FIG. 5A is a diagram illustrating a msg1-based SI request process according to one embodiment of the present disclosure.

[0025] FIG. 5B is a diagram illustrating a msg3-based SI request process according to one embodiment of the present disclosure.

[0026] FIG. 6 illustrates a case where a terminal according to one embodiment of the present disclosure receives essential system information.

[0027] FIG. 7 illustrates a procedure for a terminal to acquire SIB1 according to one embodiment of the present disclosure.

[0028] FIG. 8 illustrates a method for determining whether a terminal receives SIB1 when reselecting a cell according to one embodiment of the present disclosure.

[0029] FIG. 9 illustrates a procedure for a terminal to acquire Other SI according to one embodiment of the present disclosure.

[0030] FIG. 10 illustrates a procedure in which a terminal according to one embodiment of the present disclosure acquires Other SI based on the integrated valueTag value of Other SI.

[0031] FIG. 11 illustrates an SI update procedure according to one embodiment of the present disclosure.

[0032] FIG. 12 illustrates a procedure for providing a Lite SIB1 containing cell-based SIB1 information according to one embodiment of the present disclosure.

[0033] FIG. 13 is a flowchart of terminal operation according to one embodiment of the present disclosure.

[0034] FIG. 14 is a flowchart of base station operation according to one embodiment of the present disclosure.

[0035] FIG. 15 is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0036] FIG. 16 is a block diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In this context, it should be noted that identical components in the attached drawings are indicated by the same reference numerals whenever possible. Furthermore, detailed descriptions of known functions and configurations that may obscure the essence of the present invention will be omitted.

[0038] In describing the embodiments in this specification, technical details that are well known in the technical field to which the present invention belongs and are not directly related to the present invention are omitted. This is intended to convey the essence of the present invention more clearly without obscuring it by omitting unnecessary explanations.

[0039] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the size of each component does not entirely reflect its actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0040] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0041] At this time, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing the means of instruction to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0042] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specified logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For instance, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may be executed in reverse order according to their corresponding functions.

[0043] In this embodiment, the term "part" refers to a software or hardware component, such as an FPGA or ASIC, and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to operate one or more processors. Accordingly, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." Furthermore, the components and "parts" may be implemented to operate one or more CPUs within a device or secure multimedia card.

[0044] Hereinafter, the base station is an entity that performs resource allocation for terminals and may be at least one of Node B, BS (Base Station), eNB (eNode B), gNB (gNode B), a wireless access unit, a base station controller, or a node on a network. The terminal may include UE (User Equipment), MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, the downlink (DL) refers to the wireless transmission path of a signal transmitted by the base station to the terminal, and the uplink (UL) refers to the wireless transmission path of a signal transmitted by the terminal to the base station.

[0045] Terms used in the following description to identify connection nodes, terms referring to network entities or network functions (NFs), terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0046] Furthermore, the embodiments of the present disclosure may be applied to other communication systems having a technical background or channel type similar to the embodiments of the present disclosure described below. Additionally, the embodiments of the present disclosure may be applied to other communication systems with some modifications, provided that they do not deviate significantly from the scope of the present disclosure, at the judgment of a person with skilled technical knowledge. For example, 5th generation mobile communication technologies (5G, new radio, NR) developed after LTE-A may be included therein, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, various embodiments based on the 5G or wireless communication systems of the present disclosure may include application to wireless communication technologies developed after 5G (6G, 6G wireless communication systems, etc.). Additionally, the present disclosure may be applied to other communication systems with some modifications, provided that they do not deviate significantly from the scope of the present disclosure, at the judgment of a person with skilled technical knowledge.

[0047] For the convenience of the following explanation, some terms and names defined in the 3GPP (3rd generation partnership project) LTE (long term evolution) standards and / or 3GPP NR (new radio) standards may be used. However, the present invention is not limited by the above terms and names and can be applied in the same way to systems conforming to other standards.

[0048] FIG. 1 is a drawing illustrating the structure of a next-generation mobile communication system according to one embodiment of the present disclosure.

[0049] Referring to FIG. 1, as illustrated, the wireless access network of a next-generation mobile communication system (new radio, NR) consists of a next-generation base station (New Radio Node B, hereinafter gNB) (1-10) and an AMF (1-05, access mobility management function, new radio core network). A user terminal (new radio user equipment, hereinafter NR UE, UE, or terminal) (1-15) connects to an external network through the gNB (1-10) and the AMF (1-05).

[0050] In FIG. 1, the gNB (1-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The gNB (1-10) is connected to the NR UE via a wireless channel and can provide superior service compared to the existing Node B (1-20). In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device is required to collect state information such as the buffer status, available transmission power status, and channel status of the UEs and perform scheduling, and this is handled by the gNB (1-10). A single gNB typically controls multiple cells. To achieve ultra-high-speed data transmission compared to existing LTE, it can have a maximum bandwidth greater than the existing maximum bandwidth, and orthogonal frequency division multiplexing (hereinafter referred to as OFDM) can be used as a wireless access technology, and additional beamforming technology can be incorporated. In addition, an adaptive modulation & coding (hereinafter referred to as AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The AMF (1-05) performs functions such as mobility support, bearer configuration, and QoS (quality of service) configuration. The AMF (1-05) is a device responsible for various control functions as well as mobility management functions for the terminal, and is connected to multiple base stations. In addition, the next-generation mobile communication system can be interoperable with the existing LTE system, and the AMF (1-05) is connected to the MME (1-25) via a network interface. The MME (1-25) is connected to the existing base station, eNB (1-30). A terminal (1a-15) that supports LTE-NR Dual Connectivity can transmit and receive data while maintaining a connection to both the gNB (1-10) and the eNB (1-30) (1-35).

[0051] In LTE and NR, a specific reference cell, known as a SpCell (special cell), specifically a PCell (primary cell) or PSCell (primary SCG (secondary cell group) cell), is defined. The PCell is the cell that a terminal in standby or inactive mode can camp on and is the target of cell reselection operations. When a terminal in connection mode performs a handover or SCG change operation, the signal strength of the PCell and PSCell is considered, and the SFN (system frame number) and subframe timing of these cells serve as temporal reference points for the execution of various connection mode operations. Furthermore, if the signal strength of the cells is poor, the terminal considers the wireless link connection of the MCG (master cell group) or SCG to have failed. In carrier aggregation (CA) or dual connectivity (DC), multiple serving cells can be configured for a single terminal, and serving cells excluding the PCell or PSCell are referred to as SCells. Even if the signal strength of the above SCell is not good, the terminal does not consider the wireless link connection to have failed.

[0052] 6G mobile communication systems are being discussed that support more advanced functions and provide improved performance than the LTE or NR described above. In 6G, new technological concepts are expected to be introduced while maintaining the advantages of existing mobile communication systems. System information is network configuration information, and a broadcasting method is applied to effectively transmit it to multiple terminals. However, terminals must always possess the latest system information, and for this purpose, a certain amount of terminal power may be consumed. Furthermore, since system information must always be provided to all terminals within the service area, base station power may be consumed even when system information is unnecessary. The present disclosure proposes a method to reduce the power consumption of terminals and base stations caused by system information.

[0053] Figure 2 is a diagram illustrating a method of providing system information in an NR mobile communication system.

[0054] In an NR mobile communication system, the system information broadcast by the base station (2-10) is broadly divided into minimum SI (system information) and other system information (OSI). The minimum SI is always broadcast periodically (2-15) and includes configuration information required for initial access and SI scheduling information required to receive other SI that is broadcast periodically or on a request basis. The master information block (MIB) and SIB1 (system information block 1) belong to the minimum SI. The other SI (OSI) includes all configuration information not included in the minimum SI (other SI not included in the minimum SI). The other SI is broadcast periodically (2-20) or based on a terminal request, or is provided to the terminal using dedicated signaling (2-25). OSI is scheduled to the terminal in units of SI messages composed of one or more SIBs. When a terminal requests and receives other SI, the terminal needs to verify whether the other SI is valid in the cell or is currently being broadcast (by a request from another terminal) before performing the request for the system information; this can be done through specific information included in SIB1. A terminal in idle mode (RRC_IDLE) or inactive mode (INACTIVE mode, RRC_INACTIVE) may request OSI without changing the current RRC state. A terminal in connected mode (RRC_CONNECTED) may request and receive OSI through dedicated RRC signaling. The OSI is broadcast for a specified period at a set interval.Public Warning System (PWS) information is provided by classifying it into OSI. The aforementioned on-demand-based SI broadcasting can reduce power consumption of base stations and minimize wireless signal interference between cells.

[0055] In the 6G system, system information broadcast based on terminal requests, as previously explained, will be introduced. In addition, SIB1, which was previously broadcast periodically, can be broadcast only when requested by a terminal in 6G.

[0056] FIG. 3 illustrates the process of a moving terminal updating system information in an NR mobile communication system according to one embodiment of the present disclosure.

[0057] Another feature of the OSI in NR mobile communication systems is that it can notify SIB1 that the same information is being broadcast from adjacent cells for each SIB. This serves to prevent unnecessary terminal action of reacquiring the SIB containing the same information when the terminal moves to an adjacent cell. To support this, SIB1 includes a single Area ID and SIB-specific AreaScope information. Cells broadcasting the same SIB information are distinguished by a specific Area ID and SystemInformationAreaID. After moving to an adjacent cell, if the Area ID included in the SIB1 broadcast by the adjacent cell has the same value, there is no need to reacquire the area-based SIB. SIB1 includes an AreaScope field corresponding to each SIB belonging to the OSI, which indicates whether each SIB is an area-based SIB containing the same information as the adjacent cell. When the terminal moves to an adjacent cell, the terminal must acquire cell-based SIBs from the new cell that are not area-based SIBs. This area-based SIB concept not only reduces the power consumption of terminals but also, together with the previously explained on-demand SI broadcasting technology, provides the advantage of reducing base station power consumption by allowing the base station to reduce the frequency of OSI broadcasts.

[0058] In SIB1, a valueTag value is also provided for each SIB. This value is used to indicate the version of the SIB information, and increases whenever the information of the corresponding SIB is updated. If the valueTag value of the SIB stored by the terminal is different from the valueTag value of the SIB indicated by the current SIB1, the terminal must reacquire the SIB. For each acquired SIB, the terminal counts the validity period of a preset time (e.g., 3 hours), and when the time elapses, the terminal considers the SIB to be no longer valid and must reacquire the SIB.

[0059] The terminal (3-25) receives system information (e.g., SIB 1 of the first cell) from the first cell (3-10). The system information includes PLMN (public land mobile network) information, an Area ID (systemInformationAreaID), and a valueTag for each SIB. The terminal (3-25) moves to enter the service area of ​​the second cell (3-15) and receives system information (e.g., SIB 1 of the second cell) from the cell. The system information also includes the PLMN information, an Area ID (systemInformationAreaID), and a valueTag for each SIB. The terminal (3-25) compares the information obtained from the first cell (3-10) with the information obtained from the second cell (3-15). If the SIBs that the terminal (3-25) needs to secure are area-based SIBs and the Area ID and the valueTag for each SIB all match, the terminal (3-25) does not need to re-acquire the area-based SIB in the second cell. However, even if the terminal (3-25) does not need to re-acquire the area-based SIB, when the terminal (3-25) re-selects a cell, if the SIB that the terminal (3-25) needs to secure is a cell-based SIB, the terminal (3-25) must still re-acquire the cell-based SIB. If the SIBs that the terminal (3-25) needs to secure are area-based SIBs and at least one of the Area ID and the valueTag for each SIB does not match, the terminal (3-25) must re-acquire the area-based SIB in the second cell. Through the Area ID, the terminal (3-25) can recognize that the first cell (3-10) and the second cell (3-15) belong to the same SI Area (1-05). The terminal (3-25) moves to another cell, the third cell (3-20).The Area ID stored in the system information of the third cell (3-20) has a different value from the previous cell. Therefore, the terminal (3-25) must re-acquire even the area-based SIB. In the case of the cell-based SIB, as previously explained, it must also be re-acquired because the cell has changed.

[0060] The definitions and use of such parameters can be referenced when interpreting area IDs, PLMN IDs, value tags, etc. in various embodiments of the present disclosure.

[0061] FIG. 4 is a diagram illustrating the process of selecting msg1-based and msg3-based SI request methods in the present disclosure.

[0062] To request system information other than the minimum SI (MIB, SIB1), the terminal uses random access. The terminal requests the SI message to be received from the network using msg1 (preamble) or msg3. The SI message consists of one or more SIBs, and which SIBs are included in a single SI message can be determined by the base station implementation. In step 4-05, the terminal determines whether the periodically broadcasted SIB1 contains PRACH (physical random access channel) resource information that can be used for the SI request. The PRACH resource information includes the preamble ID (or index) information (prach-ConfigIndex) used for the SI request and wireless resource information capable of transmitting the preamble. If the SIB1 contains PRACH resource information, in step 4-10, the terminal can request system information other than the minimum SI using the msg1 dedicated to the SI request. Otherwise, in step 4-15, the terminal requests system information other than minimum SI using msg3. When proceeding to step 4-15, the terminal transmits a preamble used in normal random access (transmission of msg 1) before transmitting msg 3.

[0063] FIG. 5A is a diagram illustrating a msg1-based SI request process according to one embodiment of the present disclosure.

[0064] The base station (5-10) provides the terminal (5-05) with configuration information necessary for the msg1-based SI request process using a predetermined system information (e.g., SIB1) (5-15). The configuration information includes information regarding which SI message each resource (e.g., preamble) allocated for the SI request can be used to request. The information here may include resource configurations corresponding to each SI message indicated as not broadcasting (e.g., a first resource configuration corresponding to a first SI message not broadcasting, a second resource configuration corresponding to a second SI message not broadcasting). If the information includes only one resource configuration, the preamble(s) allocated for the SI request included in the single resource configuration may be considered to be used to request all SI messages that are not currently broadcasting. Scheduling information for each SI message and whether each SI message is currently broadcasting are provided to the terminal (5-05) via SIB1. The terminal (5-05) can determine whether it is necessary to obtain a specific SI message that is not currently being broadcast. If the terminal (5-05) needs to obtain a specific SI message that is not currently being broadcast (5-20) and the terminal (5-05) has received the configuration information related to the msg1-based SI request, the terminal (5-05) triggers the msg1-based SI request process (5-25). The terminal (5-05) transmits a preamble corresponding to the SI message it requests to the base station (5-10) (5-30). Upon successfully receiving the preamble, the base station (5-10) transmits a RAR message containing only the RAPID (random access preamble ID) to the terminal (5-05) (5-35) and broadcasts the SI message requested by the terminal (5-05) (5-45).The terminal (5-05) that receives the above RAR considers that the above SI request has been successfully transmitted to the base station (5-10) (5-40), and receives the above requested SI message using the scheduling information of the above requested SI message included in the above SIB1 (5-45).

[0065] FIG. 5B is a diagram illustrating a msg3-based SI request process according to one embodiment of the present disclosure.

[0066] The base station (5-55) provides the terminal (5-50) with scheduling information for each SI message and whether each SI message is currently being broadcast using predetermined system information (SIB1) (5-60). At this time, the SIB1 does not include configuration information related to the msg1-based SI request.

[0067] The terminal (5-50) can determine whether it is necessary to obtain a specific SI message that is not currently being broadcast. If the terminal (5-50) needs to obtain a specific SI message that is not currently being broadcast (5-65) and has not received configuration information related to the msg1-based SI request, the terminal (5-50) triggers a msg3-based SI request process (5-70). The terminal (5-50) transmits a specific preamble to the base station (5-55) (5-75). Upon successfully receiving the preamble, the base station (5-55) transmits a RAR message to the terminal (5-50) (5-80). Upon receiving the RAR, the terminal (5-50) reports msg3 to the base station (5-55) using the UL grant (uplink scheduling information) indicated by the RAR (or included in the RAR) (5-85). The above msg3 contains an RRC message (e.g., an RRCSystemInfoRequest message). The above RRC message contains a list of SI messages requested by the terminal. Positioning-related SI messages (PosSI) were also introduced in the Rel-16 NR standard, and the terminal (5-50) can request positioning-related SI messages that are not being broadcast through the above RRC message. Upon receiving the above msg3, the base station (5-55) transmits the msg4 message to the terminal (5-50) (5-90) and broadcasts the SI message requested by the terminal (5-100). Upon receiving the above msg4, the terminal (5-50) considers that the random access process has been successfully completed (5-95) and receives the requested SI message (5-100).

[0068] Meanwhile, the information for requesting SI and the operation for requesting SI described through FIGS. 4, FIGS. 5A, and FIGS. 5B may be applied to various embodiments of the present disclosure described below and may be applied to the operation for requesting SI.

[0069] FIG. 6 illustrates a case where a terminal according to one embodiment of the present disclosure receives essential system information.

[0070] In the NR system, when the terminal (6-10) camps on to a new serving cell (6-05), it receives MIB (6-15) and SIB1 (6-20) broadcast from the cell.

[0071] In Rel-19 NR, SIB1 may not be broadcast, and improvements were made so that SIB1 can be broadcast based on a terminal request. In this way, the provision of SIB1 by the base station based on a terminal request is called on-demand SIB1. The first cell (gNB 1, 6-05) may be a cell that broadcasts SIB1. A terminal (6-10) may receive MIB (6-15) and SIB1 (6-20) from the first cell (6-05). A terminal (6-10) that has entered the service area of ​​a second cell (6-25) that supports the on-demand SIB1 determines whether SIB1 is currently being broadcast in the second cell (6-25) through the information included in the MIB broadcast by the second cell (6-25) (e.g., information regarding the SSB subcarrier offset (ssb-SubcarrierOffset)) (6-30). If SIB1 is not being broadcast, the terminal (6-10) can request SIB1 by transmitting a predetermined uplink request signal (Uplink WUS (wake-up signal)) (6-35). Configuration information for transmitting the UL WUS is provided through system information broadcast by an adjacent cell or through a dedicated RRC message. Upon receiving the request, the second cell (6-25) broadcasts SIB1 (6-40).

[0072] As described above, in an NR system, when a terminal selects a new cell, it must always receive the SIB1 broadcast from the cell. If the cell supporting On-demand SI is not broadcasting the SIB1, the terminal must request and receive the SIB1. This implies that when re-selecting a cell, the terminal must always consume terminal power to acquire the SIB1. The present disclosure proposes a method to minimize the frequency with which the terminal acquires the SIB1 when re-selecting a cell by classifying SIB1 information into cell-based and area-based SIB1 information according to their characteristics and managing them individually. Additionally, the MIB includes specific information, an Area ID, a valueTag, etc. The method proposed in the present disclosure is expected to be useful for saving power for both the terminal and the base station.

[0073] FIG. 7 illustrates a procedure for a terminal to acquire SIB1 according to one embodiment of the present disclosure.

[0074] SIB1 is generally not information that is frequently updated, and some information included in the SIB1 broadcast from a cell may be set to the same value as that of the SIB1 of other adjacent cells. In this disclosure, the configuration information of SIB1 is classified into two types: one is cell-based SIB1 information, and the other is area-based SIB1 information. The cell-based SIB1 information refers to information that is not identical to that of other cells. For example, Cell ID (CellIdentity) information (or global cell identity) is used to uniquely identify a single cell within a single PLMN (or SNPN (standalone non-public network)), so it cannot be used in other cells and can be considered a representative cell-based SIB1 information. In this way, information valid only within a specific cell can be defined as cell-based SIB1 information. In contrast, area-based SIB1 information refers to SIB1 information that can be set to a value unified with other adjacent cells according to the intention of the wireless network operator. Configuration information related to cell selection operations, configuration information related to access control / barring, etc., may be provided with the same configuration values ​​as other adjacent cells. In this way, valid information for an area containing one or more cells can be defined as area-based SIB1 information.

[0075] In this embodiment, a valueTag (cell-ValueTag) for the cell-based SIB1 information and an Area ID (sib1-AreaID) and valueTag (area-ValueTag) for the area-based SIB1 information are introduced. For a general explanation of the value tag, refer to the content described through FIG. 3. The information (cell-valuetag, area-valuetag) can be used to determine whether to receive SIB1 when the terminal re-selects a cell. The new information can be stored in an MIB. The MIB in 6G is characterized by containing at least certain essential information, such as an SFN (system frame number) value, and being broadcast periodically.

[0076] A terminal (7-05) receives an MIB that is periodically broadcast by a base station (7-10) (7-15). The MIB includes a valueTag (cell-ValueTag) for cell-based SIB1 information, an Area ID (sib1-AreaID) for area-based SIB1 information, and a valueTag (area-ValueTag) for area-based SIB1 information. The terminal (7-05) can determine whether to receive the cell-based and / or area-based SIB1 by comparing the information received through the MIB with the information (cell-valuetag, sib1-areaID, area-valuetag) of the cell-based and area-based SIB1 of the corresponding cell that has been previously acquired and stored.

[0077] When reception of SIB1 is required, the terminal (7-05) can receive SIB1 broadcast by the base station (7-10) (7-20). The SIB1 includes cell-based SIB1 information and area-based SIB1 information. The received cell-based SIB1 and area-based SIB1 information correspond to the cell-ValueTag, sib1-AreaID, and area-ValueTag obtained from the MIB, respectively. That is, the cell-based SIB1 corresponds to the cell-ValueTag, and the area-based SIB1 corresponds to the sib1-AreaID and area-ValueTag. The terminal (7-05) stores all of the obtained information. In particular, the cell-ValueTag may prevent the terminal (7-05) from receiving the cell-based SIB1 of the cell when it leaves the cell of the base station (7-10) and returns. That is, if the cell-ValueTag value stored in the terminal (7-05) and the cell-ValueTag value of the MIB newly acquired by the terminal (7-05) are identical, it means that the cell-based SIB1 information has not changed. If the base station (7-10) is not broadcasting SIB1, the terminal (7-05) can request the base station to broadcast SIB1. To do this, the terminal (7-05) can transmit a predetermined UL WUS to the base station (7-10). The configuration information required for transmitting the UL WUS can be provided to the terminal (7-05) through system information transmitted by an adjacent cell or through dedicated signaling. The above terminal (7-05) can determine whether the above SIB1 is being broadcast by checking whether the actual SIB1 is being broadcast at a predefined broadcast occasion of SIB1 (location of the wireless resource where SIB1 is being broadcast), or by using an indicator (sib1-BroadcastStatus) that indicates whether the current SIB1 is being broadcast included in the MIB.

[0078] The terminal (7-05) can obtain cell-based SIB1 information of surrounding adjacent cells and cell-ValueTag information of surrounding adjacent cells through a specific SIB or RRC message (dedicated RRC message, e.g., RRC Release message, but not limited thereto) broadcast by the base station (7-10) (7-25). This allows the terminal to not receive the SIB1 of the cell when it moves to one of the adjacent cells. The specific SIB or RRC message may also include area-based SIB1 information of surrounding adjacent cells, sib1-AreaID of surrounding adjacent cells, and area-ValueTag information.

[0079] In summary, the terminal (7-05) obtains and stores cell-based and area-based SIB1 for a cell when the terminal (7-05) stays in the cell, or through specific system information (7-25) of an adjacent cell (7-30). The terminal (7-05) may obtain and store the cell-based and area-based SIB1 of the cell when it is in the cell, or it may obtain and store the cell-based and area-based SIB1 system information of the cell by obtaining the SIB1 of an adjacent cell through system information, as in the operation of 7-25. When the terminal (7-05) obtains all of the above information, a specific timer (e.g., a 3-hour timer) is activated, and when the timer expires, the information is considered no longer valid, and the terminal (7-05) must re-obtain the information. When the terminal (7-05) moves to the cell, it can determine whether to receive SIB1 from the cell through information such as cell-ValueTag, sib1-AreaID, and area-ValueTag included in the MIB broadcast by the cell.

[0080] The operations for obtaining SIB1 described through FIG. 7 can be applied to the operations for requesting and obtaining SIB1 in the embodiments of the present disclosure described below.

[0081] FIG. 8 illustrates a method for determining whether a terminal receives SIB1 when reselecting a cell according to one embodiment of the present disclosure.

[0082] According to the method disclosed above, the process of determining whether the terminal receives SIB1 when reselecting a cell is described.

[0083] The terminal (8-10) receives an MIB (8-15), a SIB1 (8-20), and a SIBx (8-25) from a first base station (8-05). The cell-ValueTag stored in the MIB corresponds to the cell-based SIB1 information contained in the SIB1, and the sib1-AreaID and area-ValueTag stored in the MIB correspond to the area-based SIB1 information contained in the SIB1. The SIBx includes cell-based SIB1 information of a specific cell of an adjacent second base station (8-30) and a corresponding cell-ValueTag. The SIBx may further include area-based SIB1 information of a specific cell of an adjacent base station (8-30) and corresponding sib1-AreaID and area-ValueTag information.

[0084] The terminal (8-10) can move into the service area of ​​the second base station (8-30). The terminal (8-10) receives an MIB from the second base station (8-30) (8-35). The terminal (8-10) recognizes that it is one of the specific cells indicated in the SIBx through the carrier frequency, PCI, etc. of the specific cell of the base station. The terminal (8-10) determines whether the sib1-AreaID, area-ValueTag, and cell-ValueTag values ​​corresponding to the area-based SIB1 information and cell-based SIB1 information included in the MIB received from the second base station (8-30) are the same as the values ​​it has stored (for example, comparing whether they are the same as the values ​​it has obtained and stored from the first base station (8-05) via SIBx or RRC messages). In various embodiments of the present disclosure, comparing sib1-AreaID and area-valueTag can be interpreted as comparing the value of sib1-AreaID and the value of area-valueTag. If the sib1-AreaID and area-ValueTag values ​​obtained and stored by the terminal (8-10) from the first base station (8-05) are identical to the sib1-AreaID and area-ValueTag obtained from the MIB of the second base station (8-30), the terminal (8-10) may determine that the area-based SIB1 information stored can be applied as is at the second base station (8-30). Additionally, if the cell-ValueTag value obtained and stored from the first base station (8-05) is the same as the cell-ValueTag value obtained from the MIB of the second base station (8-30), the terminal (8-10) can determine that the cell-based SIB1 information of the stored cell can be applied as is at the second base station (8-30).If the terminal (8-10) considers (or determines) that the cell-based and area-based SIB1 stored therein can be applied as is at the second base station (8-30), the terminal (8-10) does not need to receive the SIB1 from the second base station (8-30). Accordingly, even though the terminal (8-10) has moved from the first base station (8-05) to the second base station (8-30), it does not need to acquire it, and unnecessary power consumption and / or signaling overhead can be reduced.

[0085] On the other hand, if the terminal (8-10) finds that some area-based SIB1 information (e.g., TAC (tracking area code) value) of the second base station (8-30) is different from some area-based SIB1 information of the first base station (8-05), then the sib1-AreaID or area-valueTag is also different. In this case, if the sib1-AreaID and area-valueTag obtained from the second base station (8-30) are compared with the sib1-AreaID and area-valueTag obtained from and stored by the first base station (8-05), at least one of the sib1-AreaID or area-valueTag will be different. In this case, the terminal (8-10) must receive the SIB1 broadcast from the second base station (8-30).

[0086] Since the sib1-AreaID and area-ValueTag for the area-based SIB1 information are stored in a MIB of limited size, it is necessary to minimize the amount of information as much as possible. Rather than defining the two pieces of information separately, they can be integrated into a single parameter to satisfy the purpose of each piece of information. In this disclosure, this is defined as the Unified valueTag, but this is for convenience of explanation and the name of the term is not limited thereto. The Unified valueTag for the area-based SIB1 information is included in the MIB, replacing the sib1-AreaID and area-ValueTag. Whenever the area-based SIB1 information is updated, the network changes the value of the corresponding Unified valueTag and stores it in the MIB. Since the Unified valueTag must also serve as the existing Area ID, the Unified valueTag value broadcast by one cell through the MIB must maintain a different value from the Unified valueTag broadcast by a cell belonging to another SIB1 area. Therefore, when updating the value, the above network should not simply increment it by 1, but should increment it in a way that avoids duplication with values ​​used in other adjacent SIB1 areas. Alternatively, the network may increment the value of unifiedValueTag by 1, but use different ranges of values ​​or apply an offset so that values ​​do not overlap by area.

[0087] The operations for obtaining SIB1 described through FIG. 8 can be applied to the operations for requesting and obtaining SIB1 in the embodiments of the present disclosure described below.

[0088] FIG. 9 illustrates a procedure for a terminal to acquire Other SI according to one embodiment of the present disclosure.

[0089] In an NR system, the Area ID applied to the OSI, the areaScope and valueTag information for each SIB, and the si-BrodcastStatus for each SI message (indicating whether the corresponding SI message is currently being broadcast) are stored in SIB1. Therefore, in order for a terminal to determine whether to receive the OSI, it must first receive SIB1 and check the above information. If SIB1 is not being broadcast, the terminal must proceed with the procedure of additionally requesting SIB1. This is not beneficial for saving power in the terminal. Accordingly, in an embodiment of the present disclosure, a method is proposed to include the Area ID applied to the OSI, the areaScope and valueTag information for each SIB, and the si-BrodcastStatus for each SI message in the MIB. Meanwhile, if the above information is included in the MIB, there is no longer a need to store such information in SIB1, and the burden of the terminal having to unconditionally receive SIB1 to determine whether to receive the OSI can be reduced.

[0090] A terminal (9-05) receives an MIB from a base station (9-10) (9-15). The MIB may include an Area ID applicable to the OSI, an areaScope for each SIB, valueTag information, and an si-BroadcastStatus for each SI msg (some information may be omitted). If the Area ID or the valueTag value of a specific SIB is different from a previously stored value, or if a cell-based OSI exists through the areaScope information for each SIB, the terminal (9-05) needs to receive the OSI. If the terminal (9-05) has already obtained a valid SIB1 (e.g., through the method described above in the present disclosure) (9-20), it can perform an operation to receive a predetermined OSI immediately without receiving the SIB1 (9-25). If the terminal (9-05) has not obtained a valid SIB1, the terminal can perform an operation to obtain the SIB1 (9-20). This refers to the determination of a valid SIB1 for obtaining SIB1 and the operations for obtaining SIB1 of the above-described embodiment. SIB1 contains scheduling information for obtaining OSI, and the terminal (9-05) can obtain OSI based on the scheduling information. Additionally, through the si-BroadcastStatus information for each SI msg included in the MIB, if the SI message to be received is not currently being broadcast, the terminal (9-05) can perform a corresponding SI message request operation. The operation for requesting an SI message refers to the operation of the above-described embodiment. If it is determined that there is no need to receive OSI based on the reception of the MIB, the operation to receive OSI may not be performed. In this case, the operation to obtain SIB1 for OSI and the operation to determine the validity of SIB1 may also be unnecessary.

[0091] In NR systems, OSI areaScope and valueTag are provided per SIB. Since the above information is stored in MIBs, it is necessary to reduce the amount of such information. Therefore, as an alternative, the areaScope and valueTag may be provided per SI message. That is, whether it is cell-based or area-based can be indicated at the SI message level, and the valueTag also corresponds to an SI message that is a component of the SIB, rather than a single SIB.

[0092] The operations for obtaining the OSI described through FIG. 9 can be applied to the operations for requesting and obtaining the OSI in the embodiments of the present disclosure described below.

[0093] FIG. 10 illustrates a procedure in which a terminal according to one embodiment of the present disclosure acquires Other SI based on the integrated valueTag value of Other SI.

[0094] Since the valuetags of existing OSIs are specified per SIB, storing them in an MIB may be difficult due to the size limitations of the MIB. To minimize the amount of information stored in the MIB, we propose a single integrated valuetag (common-ValueTag, though the name is not limited to this) for the OSIs included in the MIB. If even just one of the SIBs belonging to the OSI changes, the value of the integrated valuetag (common-ValueTag) is updated.

[0095] A terminal (10-05) receives an MIB from a base station (10-10) (10-15). The MIB includes a common-ValueTag. If the common-ValueTag value obtained from the base station (10-10) is different from the common-ValueTag value that the terminal (10-05) has obtained from another base station (or another cell) and stores, the terminal (10-05) receives SIB1 (10-20). That is, the terminal (10-05) can determine the validity or change of the OSI based on the comparison of the common-ValueTag values. If the value of the common-ValueTag is different, it can be determined that at least one of the SIBs belonging to the OSI is invalid or has been changed, and to verify this, the terminal (10-05) may need to obtain SIB1. The terminal (10-05) checks the valueTag values ​​for each SIB or SI msg included in the SIB1 and recognizes which SIB or SI msg has been changed. The terminal (10-05) receives the modified OSI from the base station (10-10) (10-25). Based on the scheduling information for the SI msg of SIB1, the terminal can receive the OSI that the terminal (10-05) needs.

[0096] The operations for obtaining the OSI described through FIG. 10 can be applied to the operations for requesting and obtaining the OSI in the embodiments of the present disclosure described below.

[0097] FIG. 11 illustrates an SI update procedure according to one embodiment of the present disclosure.

[0098] The base station (11-10) notifies the terminal (11-05) that an SI update is required through a predetermined signaling (e.g., Short Message) (11-15). Upon receiving the signaling, the terminal (11-05) receives the MIB broadcast from the base station (11-10) (11-20). The terminal (11-05) determines whether to receive SIB1 and OSI by comparing the sib1-AreaID, area-ValueTag, cell-ValueTag, OSI Area ID, SIB-specific areaScope, and valueTag included in the MIB with the corresponding values ​​it has stored (11-25). In accordance with the above-described embodiment, if a unified value tag or a common value tag is used, the reception of SIB1 and OSI can be determined by comparing the corresponding values. The operations for determining the reception or acquisition of SIB1 and OSI by comparing the various parameters refer to the operations of the above-described embodiments. The terminal (11-05) can receive SIB1 and receive OSI according to the operation 11-25 (11-30). The terminal (11-05) may determine that there is no need to acquire SIB1 again (receiving SIB1 is skipped), and in this case, the terminal (11-05) may perform the procedure of receiving OSI without receiving SIB1 (11-30).

[0099] FIG. 12 illustrates a procedure for providing a Lite SIB1 containing cell-based SIB1 information according to one embodiment of the present disclosure.

[0100] The information stored in the MIB is very limited due to the limitations of its capacity. For example, the MIB in NR can only store information of 30 bits or less. The capacity of the 6G MIB is not yet determined, but it is highly likely that it will not be significantly expanded. Therefore, it may be difficult to store the information proposed in the above embodiment in the MIB (12-15). In this embodiment, a new Lite SIB1 (12-20) is proposed that includes cell-based SIB1 information, cell-ValueTag, sib1-AreaID, area-ValueTag, Area ID for OSI, areaScope applied to each SIB, and valueTag information. Lite SIB1 is an example of a term, and the name of the message containing such information is not limited to Lite SIB1. Lite SIB1 is differentiated from SIB1 (12-25) that contains only area-based SIB1 information. SIB1 may include information that is included in the existing SIB1 but is excluded from the information included in Lite SIB1, and its name may be defined as something other than SIB1. The above Lite SIB1 may be provided to the terminal periodically or on-demand. When a message such as Lite SIB1 is introduced, the operations for acquiring and updating SIB and SI messages performed by the terminal in the aforementioned embodiments may be performed based on the information included in Lite SIB1.

[0101] FIG. 13 is a flowchart of terminal operation according to one embodiment of the present disclosure.

[0102] In step 13-05, the terminal re-selects a cell.

[0103] In step 13-10, the terminal receives an MIB broadcast from the cell. The MIB may contain information proposed in various embodiments of the present disclosure. For specific details, refer to the information contained in the MIBs of the aforementioned embodiments.

[0104] In steps 13-15, the terminal may determine whether to receive SIB1 or OSI from the cell by comparing the information included in the MIB with the information stored in the terminal. For example, the terminal determines whether to receive SIB1 or a specific OSI (SIB or SI msg) from the cell by comparing the cell-ValueTag, sib1-AreaID, area-ValueTag, Area ID for OSI, areaScope applied to each SIB, and valueTag information included in the received MIB with the previously stored information. The operation in 13-15 is not limited thereto, and the operation of the terminal according to various embodiments of the present disclosure described above may be applied. For example, when Lite SIB1 is applied as described in FIG. 12, the operation in 13-15 may be performed based on the information included in Lite SIB1.

[0105] In steps 13-20, the terminal skips receiving SIB1 or OSI from the cell in accordance with the decision of operation 13-15, and applies the previously stored SIB1 or OSI information to predetermined operations with the cell. Additionally, the terminal may receive SIB1 and / or OSI from the cell in accordance with the decision of operation 13-15. The operation of skipping the reception of SIB1 and OSI and the operation of receiving them refer to the operation of the terminal described through the previously described embodiments.

[0106] In addition, even if not specified in FIG. 13, the operations of the terminal of the above-described embodiments can be performed by the terminal.

[0107] FIG. 14 is a flowchart of base station operation according to one embodiment of the present disclosure.

[0108] In step 14-05, the base station may broadcast MIB, SIB1, and OSI. For example, the base station broadcasts an MIB containing sib1-AreaID, Area ID, cell-ValueTag, area-ValueTag, and / or areaScope and valueTag applicable to each SIB, corresponding to the SIB1 area and SI area to which it belongs, and broadcasts SIB1 and OSI. SIB1 and OSI may also be broadcast temporarily based on a request from a terminal. The information included in the MIB and SIB1 broadcast by the base station is not limited thereto, and information described through the aforementioned embodiments may be included in MIB and SIB1. When Lite SIB1 is used, the base station broadcasts Lite SIB1, and the information included in Lite SIB1 refers to the aforementioned embodiments.

[0109] In step 14-10, when all or part of the information of SIB1 is changed, the base station determines whether the changed information is cell-based or area-based information of SIB1. If the cell-based SIB1 information is changed, the cell-ValueTag value stored in the MIB is increased (changed or updated), and if the area-based SIB1 information is changed, the area-ValueTag value stored in the MIB is increased (changed or updated).

[0110] In steps 14-15, when the OSI changes, the base station increases the valueTag value corresponding to the changed SIB among the valueTag stored in the MIB.

[0111] Although the 14-10 and 14-15 operations were described separately above, this is for convenience of explanation and does not necessarily mean that the operations are performed separately. For example, if all or part of the information in SIB1 is changed, or if the OSI is changed, the MIB, Lite MIB, SIB1, etc. can be updated to reflect this.

[0112] In accordance with the aforementioned embodiments, if the information to be updated is included in SIB1 or Lite SIB1 rather than MIB, the information can be updated in SIB1 or Lite SIB1. The base station can broadcast the updated MIB. Additionally, if the information in SIB1 or Lite SIB1 changes, the base station can broadcast SIB1 or Lite SIB1 with the updated information.

[0113] In addition, the base station can broadcast SIB1 and OSI in response to a request from the terminal. Even if not specifically described in FIG. 14, the operations of the base station explained through the aforementioned embodiments can be performed by the base station.

[0114] FIG. 15 is a structure of a terminal according to one embodiment of the present disclosure.

[0115] Referring to the drawing above, the terminal includes an RF (Radio Frequency) processing unit (15-10), a baseband processing unit (15-20), a storage unit (15-30), and a control unit (15-40). The control unit (15-40) may further include a multiple connection processing unit (15-42).

[0116] The RF processing unit (15-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (15-10) up-converts the baseband signal provided by the baseband processing unit (15-20) into an RF band signal, 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 (15-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Although only one antenna is shown in the drawing, the terminal may be equipped with multiple antennas. In addition, the RF processing unit (15-10) may include multiple RF chains. Furthermore, the RF processing unit (15-10) may perform beamforming. For the above beamforming, the RF processing unit (15-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processing unit can perform MIMO and can receive multiple layers when performing MIMO operation.

[0117] The baseband processing unit (15-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (15-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (15-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (15-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (15-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT (inverse fast Fourier transform) operation and CP (cyclic prefix) insertion. Additionally, upon receiving data, the baseband processing unit (15-20) divides the baseband signal provided by the RF processing unit (15-10) into OFDM symbol units, restores the signals mapped to subcarriers through a fast Fourier transform (FFT) operation, and then restores the received bit sequence through demodulation and decoding.

[0118] The baseband processing unit (15-20) and the RF processing unit (15-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (15-20) and the RF processing unit (15-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit (15-20) and the RF processing unit (15-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit (15-20) and the RF processing unit (15-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), cellular network (e.g., LTE), etc. In addition, the above different frequency bands may include super high frequency (SHF) bands (e.g., 2 NR Hz, NR Hz) and millimeter wave (e.g., 60 GHz) bands.

[0119] The storage unit (15-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (15-30) can store information related to a second connection node that performs wireless communication using a second wireless connection technology. Additionally, the storage unit (15-30) provides the stored data upon request from the control unit (15-40).

[0120] The control unit (15-40) controls the overall operations of the terminal. For example, the control unit (15-40) transmits and receives signals through the baseband processing unit (15-20) and the RF processing unit (15-10). Additionally, the control unit (15-40) writes and reads data to and from the storage unit (15-40). To this end, the control unit (15-40) may include at least one processor. For example, the control unit (15-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit (15-40) may control the operation of the terminal to obtain system information according to various embodiments of the present disclosure.

[0121] FIG. 16 illustrates the block configuration of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0122] As illustrated in the drawing above, the base station is configured to include an RF processing unit (16-10), a baseband processing unit (16-20), a backhaul communication unit (16-30), a storage unit (16-40), and a control unit (16-50). The control unit (16-50) may further include a multiple connection processing unit (16-52).

[0123] The RF processing unit (16-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (16-10) upconverts the baseband signal provided by the baseband processing unit (16-20) into an RF band signal, transmits it through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (16-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in the drawing, the first connection node may be equipped with multiple antennas. Additionally, the RF processing unit (16-10) may include multiple RF chains. Furthermore, the RF processing unit (16-10) may perform beamforming. For the above beamforming, the RF processing unit (16-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit can perform down-to-down MIMO operation by transmitting one or more layers.

[0124] The baseband processing unit (16-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (16-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (16-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (16-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (16-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT operation and CP insertion. Additionally, upon receiving data, the baseband processing unit (16-20) divides the baseband signal provided by the RF processing unit (16-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operations, and then restores the received bit sequence through demodulation and decoding. The baseband processing unit (16-20) and the RF processing unit (16-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (16-20) and the RF processing unit (16-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, a communication unit, or a wireless communication unit.

[0125] The backhaul communication unit (16-30) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (16-30) converts a bit sequence transmitted from the base station to another node, e.g., an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from the other node into a bit sequence.

[0126] The storage unit (16-40) stores data such as basic programs, application programs, and configuration information for the operation of the base station. In particular, the storage unit (16-40) can store information regarding bearers assigned to connected terminals, measurement results reported from connected terminals, etc. Additionally, the storage unit (16-40) can store information that serves as a criterion for determining whether to provide or disconnect multiple connections to the terminal. Furthermore, the storage unit (16-40) provides the stored data upon the request of the control unit (16-50).

[0127] The control unit (16-50) controls the overall operations of the base station. For example, the control unit (16-50) transmits and receives signals through the baseband processing unit (16-20) and the RF processing unit (16-10) or through the backhaul communication unit (16-30). Additionally, the control unit (16-50) writes and reads data to and from the storage unit (16-40). To this end, the control unit (16-50) may include at least one processor. The control unit (16-50) can control the operation of the base station to provide MIB and system information according to various embodiments of the present disclosure.

[0128] It should be noted that the aforementioned configuration diagrams, exemplary diagrams of control / data signal transmission methods, exemplary diagrams of operation procedures, and configuration diagrams are not intended to limit the scope of the rights of the present disclosure. That is, all components, entities, or steps of operation described in the embodiments of the present disclosure should not be interpreted as essential components for the implementation of the disclosure, and may be implemented within a scope that does not impair the essence of the disclosure even if only some components are included. Furthermore, each embodiment may be combined and operated as needed. For example, parts of the methods proposed in the present disclosure may be combined to operate network entities and terminals.

[0129] The operations of the base station or terminal described above can be realized by providing a memory device storing the corresponding program code in any component within the base station or terminal device. That is, the control unit of the base station or terminal device can execute the operations described above by reading the program code stored in the memory device using a processor or CPU (Central Processing Unit) and executing it.

[0130] Various components of entities, base stations, or terminal devices and modules described in this disclosure may be operated using hardware circuits, such as, for example, complementary metal oxide semiconductor-based logic circuits, firmware, software, and / or a combination of hardware and firmware and / or software embedded in a machine-readable medium. For example, various electrical structures and methods may be implemented using electrical circuits such as transistors, logic gates, and application-specific semiconductors.

[0131] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. 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 this disclosure.

[0132] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), magnetic disc storage devices, CD-ROM (Compact Disc-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0133] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0134] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0135] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined to operate a base station and a terminal. Additionally, the embodiments of the present disclosure are applicable to other communication systems, and other variations based on the technical concept of the embodiments may also be implemented.

Claims

1. A method performed by a terminal in a wireless communication system, A step of receiving a master information block (MIB) from a base station; A step of determining reception of at least one of a cell-based SIB1 (system information block 1) or an area-based SIB1 based on information included in the above MIB; and A method comprising the step of receiving at least one of the cell-based SIB1 or the area-based SIB1 based on the above decision.

2. In Paragraph 1, The above MIB is, It includes a first value tag for the cell-based SIB1, a second value tag for the area-based SIB1, and an area identifier, or It includes a unified value tag associated with the above-mentioned second value tag and the above-mentioned area identifier, and The reception of the cell-based SIB1 is determined based on the first value tag, and A method in which the reception of the area-based SIB1 is determined based on the second value tag and the area identifier, or based on the unified value tag.

3. In Paragraph 1, The method further includes the step of receiving OSI (other system information) or RRC (radio resource control) messages from the base station. The above OSI or RRC message is, Information about the area-based SIB1 of adjacent cells, or A method including a value tag and an area identifier for the area-based SIB1 of the adjacent cell.

4. In Paragraph 1, Information regarding the above Cell-based SIB1, value tag regarding the above cell-based SIB1, The value tag and area identifier for the above area-based SIB1, or Receive a Lite SIB containing a value tag and area identifier for OSI, and A method for receiving the cell-based SIB1 or the area-based SIB1 based on the above Lite SIB.

5. In a method performed by a base station in a wireless communication system, Step of broadcasting the MIB (master information block); A step of determining a broadcast for at least one of a requested cell-based SIB1 (system information block 1) or area-based SIB1 based on information included in the above MIB; and A method comprising the step of broadcasting at least one of the cell-based SIB1 or the area-based SIB1 based on the above decision.

6. In Paragraph 5, The above MIB is, It includes a first value tag for the cell-based SIB1, a second value tag for the area-based SIB1, and an area identifier, or It includes a unified value tag associated with the above-mentioned second value tag and the above-mentioned area identifier, and The request for the cell-based SIB1 is determined based on the first value tag, and A method in which the request for the area-based SIB1 is determined based on the second value tag and the area identifier, or based on the unified value tag.

7. In Paragraph 5, It further includes a step of broadcasting OSI (other system information) or RRC (radio resource control) messages, The above OSI or RRC message is, Information about the area-based SIB1 of adjacent cells, or A method including a value tag and an area identifier for the area-based SIB1 of the adjacent cell.

8. In Paragraph 5, Information regarding the above Cell-based SIB1, value tag regarding the above cell-based SIB1, The value tag and area identifier for the above area-based SIB1, or Broadcast a Lite SIB containing value tags and area identifiers for OSI, and A method for broadcasting the cell-based SIB1 or the area-based SIB1 based on the above Lite SIB.

9. In a terminal of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and The terminal is connected to communicate with at least one processor and is capable of executing individually or in any combination of the at least one processor, so that the terminal, Receive the MIB (master information block) from the base station, Based on the information included in the above MIB, it is determined to receive at least one of a cell-based SIB1 (system information block 1) or an area-based SIB1, and Based on the above decision, at least one of the cell-based SIB1 or the area-based SIB1 is received, Memory that stores instructions to do so; A terminal including 10. In Paragraph 9, The above MIB is, It includes a first value tag for the cell-based SIB1, a second value tag for the area-based SIB1, and an area identifier, or It includes a unified value tag associated with the above-mentioned second value tag and the above-mentioned area identifier, and The reception of the cell-based SIB1 is determined based on the first value tag, and A terminal in which the reception of the above area-based SIB1 is determined based on the above second value tag and the above area identifier, or based on the above unified value tag.

11. In Paragraph 9, The above command causes the terminal to receive OSI (other system information) or RRC (radio resource control) messages from the base station, and The above OSI or RRC message is, Information about the area-based SIB1 of adjacent cells, or A terminal including a value tag and an area identifier for the area-based SIB1 of the adjacent cell.

12. In Paragraph 9, Information regarding the above Cell-based SIB1, value tag regarding the above cell-based SIB1, The value tag and area identifier for the above area-based SIB1, or Receive a Lite SIB containing a value tag and area identifier for OSI, and A terminal receiving the cell-based SIB1 or the area-based SIB1 based on the above Lite SIB.

13. In a base station of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and The base station is connected to communicate with at least one processor and is capable of executing individually or in any combination of the at least one processor, and, Broadcast the MIB (master information block), and Based on the information included in the above MIB, a broadcast for at least one of the requested cell-based SIB1 (system information block 1) or area-based SIB1 is determined, and Based on the above decision, broadcast at least one of the cell-based SIB1 or the area-based SIB1, Memory that stores instructions to do so; Base station including 14. In Paragraph 13, The above MIB is, It includes a first value tag for the cell-based SIB1, a second value tag for the area-based SIB1, and an area identifier, or It includes a unified value tag associated with the above-mentioned second value tag and the above-mentioned area identifier, and The request for the cell-based SIB1 is determined based on the first value tag, and A base station where the request for the area-based SIB1 is determined based on the second value tag and the area identifier, or based on the unified value tag.

15. In Paragraph 13, The above command causes the base station to broadcast OSI (other system information) or RRC (radio resource control) messages, and The above OSI or RRC message is, Information about the area-based SIB1 of adjacent cells, or A base station comprising a value tag and an area identifier for the area-based SIB1 of the adjacent cell.

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