Method and apparatus for blocking mechanism for cell for transmission of on-demand SIB1 in next generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to a method performed by a terminal in a wireless communication system, the method comprising the steps of: receiving, from a serving cell, system information including wake-up signal (WUS) configuration and cell reselection information; receiving, from an adjacent cell, information indicating whether transmission of system information block 1 (SIB1) is supported in an on-demand manner; determining, on the basis of the information, whether the adjacent cell supports transmission of the SIB1 in the on-demand manner; and transmitting, to the adjacent cell, a message requesting transmission of the SIB1 in the on-demand manner when the adjacent cell supports transmission of the SIB1 in the on-demand manner and the adjacent cell is not prohibited.

Description

Method and device for blocking mechanism for a cell transmitting ON-DEMAND SIB1 in a next-generation mobile communication system

[0001] The present disclosure relates to the operation of a mobile communication system terminal and base station. Furthermore, the present disclosure relates to a method for obtaining on-demand system information and reselecting a blocked cell in relation to the on-demand system information in a next-generation mobile 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 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 satisfy 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] Once these 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 aims to provide a blocking mechanism for a cell transmitting an on-demand SIB (system information block) (e.g., on demand SIB 1) in a next-generation mobile communication system.

[0009] According to various embodiments of the present disclosure, a method performed by a terminal in a wireless communication system is provided, comprising the steps of: receiving system information including wake-up signal (WUS) setup and cell reselection information from a serving cell; receiving information indicating whether a neighboring cell supports transmission of a system information block 1 (SIB 1) in an on-demand manner; determining whether the neighboring cell supports transmission of the SIB 1 in the on-demand manner based on the information; and transmitting a message requesting transmission of the SIB 1 in the on-demand manner to the neighboring cell if the neighboring cell supports transmission of the SIB 1 in the on-demand manner and the neighboring cell is not prohibited.

[0010] In addition, according to various embodiments of the present disclosure, a method performed by a terminal in a wireless communication system may be provided, characterized by including the steps of: receiving system information including wake-up signal (WUS) configuration information from a serving cell; determining whether a neighboring cell selected based on cell reselection evaluation supports transmission of SIB 1 (system information block 1) in an on-demand manner; transmitting a message requesting transmission of the SIB 1 in the on-demand manner to the neighboring cell if the neighboring cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner; and receiving the SIB 1 from the neighboring cell.

[0011] In addition, according to various embodiments of the present disclosure, a method of a base station operating a first cell in a wireless communication system may be provided, including the steps of receiving a message requesting transmission of a system information block 1 (SIB 1) in an on-demand manner from a terminal that is not served by the first cell, and transmitting the SIB 1 to the terminal based on the message, wherein system information including wake-up signal (WUS) configuration information for the terminal to transmit the message to the first cell is provided to the terminal from a second cell of the terminal, and when the first cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, the message is transmitted to the first cell, and the second cell corresponds to a serving cell of the terminal, and the first cell corresponds to an adjacent cell of the terminal.

[0012] In addition, according to various embodiments of the present disclosure, a terminal of a wireless communication system may be provided, including a transceiver and at least one processor, wherein the at least one processor receives system information including wake-up signal (WUS) configuration information from a serving cell, determines whether a neighboring cell selected based on cell reselection evaluation supports transmission of SIB 1 (system information block 1) in an on-demand manner, and if the neighboring cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, transmits a message requesting transmission of the SIB 1 in the on-demand manner to the neighboring cell, and controls the terminal to receive the SIB 1 from the neighboring cell.

[0013] In addition, according to various embodiments of the present disclosure, in a wireless communication system, a base station operating a first cell includes a transceiver and at least one processor, wherein the at least one processor receives a message requesting transmission of a system information block 1 (SIB 1) in an on-demand manner from a terminal that is not served by the first cell, and controls transmission of the SIB 1 to the terminal based on the message, and system information including wake-up signal (WUS) configuration information for the terminal to transmit the message to the first cell is provided to the terminal from a second cell of the terminal, and when the first cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, the message is transmitted to the first cell, and the second cell may be a serving cell of the terminal, and the first cell may provide a base station corresponding to an adjacent cell of the terminal.

[0014] The technical problems to be achieved in the embodiments of the present invention 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 invention belongs from the description below.

[0015] According to various embodiments of the present disclosure, an improved method of operating a terminal and a base station in a mobile communication system can be provided.

[0016] Additionally, various embodiments of the present disclosure may provide improved operation of a cell providing on-demand SIB and a terminal operating therewith.

[0017] In addition, according to various embodiments of the present disclosure, it is possible to provide blocking of a cell providing on-demand SIB1 and an operation for processing the same, and an operation of a terminal operating with the cell.

[0018] FIG. 1 is a diagram illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0019] FIG. 2 is a diagram illustrating a wireless protocol structure in an LTE system according to an embodiment of the present disclosure.

[0020] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0021] FIG. 4 is a diagram illustrating a wireless protocol structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0022] FIG. 5 is a diagram illustrating a procedure for a terminal in an RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) to reselect a cell for periodically transmitting essential system information in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0023] FIG. 6 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0024] FIG. 7 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0025] FIG. 8 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0026] FIG. 9 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0027] FIG. 10 is a diagram showing the configuration of a terminal according to an embodiment of the present disclosure.

[0028] FIG. 11 is a diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. It should be noted that, where possible, identical components are represented by identical reference numerals throughout the attached drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

[0030] In describing the embodiments herein, descriptions of technical details that are well-known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to avoid obscuring the gist of the present invention by omitting unnecessary explanations and to convey the gist more clearly.

[0031] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0032] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only 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. Like reference numerals designate like elements throughout the specification.

[0033] At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flow diagram block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flow diagram block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also 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 performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0035] Here, the term '~ unit' used in the present embodiment means a software or hardware component such as an FPGA or ASIC, and the '~ unit' performs 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 play one or more processors. Accordingly, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, 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 '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. Additionally, components and '~parts' may be implemented to regenerate one or more CPUs within a device or secure multimedia card.

[0036] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a Node B, a BS (Base Station), an eNB (eNode B), a gNB (gNode B), 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 addition, the embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type to the embodiments of the present disclosure described below. In addition, the embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure at the discretion of a person having skilled technical knowledge. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems through some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0037] In the following description, terms used to identify connection nodes, terms referring to network entities or network functions (NFs), terms referring to messages, terms referring to interfaces between network objects, terms referring to various identification information, etc. are examples provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0038] For convenience of explanation below, some terms and names defined in the 3rd generation partnership project (3GPP) LTE (long term evolution) standard and / or 3GPP NR (new radio) standard may be used. However, the present invention is not limited to the above terms and names, and can be equally applied to systems conforming to other standards.

[0039] FIG. 1 is a diagram illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0040] Referring to FIG. 1, as illustrated, the wireless access network of the LTE system is composed of next-generation base stations (Evolved Node Bs, hereinafter ENBs, Node Bs or base stations) (1-05, 1-10, 1-15, 1-20), MMEs (1-25, Mobility Management Entity) and S-GWs (1-30, Serving-Gateway). User equipment (UEs, hereinafter UEs or terminals) (1-35) access external networks through ENBs (1-05 to 1-20) and S-GWs (1-30).

[0041] In Fig. 1, ENBs (1-05 to 1-20) correspond to the existing Node B of the UMTS system. ENBs are connected to UEs (1-35) via a wireless channel and perform a more complex role than the existing Node B. In the LTE system, all user traffic, including real-time services such as VoIP (Voice over IP) via the Internet Protocol, is serviced through a shared channel. Therefore, a device that collects status information such as the buffer status of UEs, available transmission power status, and channel status and performs scheduling is required, and ENBs (1-05 to 1-20) are in charge of this. One ENB typically controls multiple cells. For example, in order to implement a transmission speed of 100 Mbps, the LTE system uses, for example, orthogonal frequency division multiplexing (OFDM) as a wireless access technology in a 20 MHz bandwidth. In addition, it applies Adaptive Modulation & Coding (AMC) method that determines modulation scheme and channel coding rate according to the channel condition of the terminal. S-GW (1-30) is a device that provides data bearers and creates or removes data bearers according to the control of MME (1-25). MME (1-25) is a device that is responsible for mobility management function for terminals as well as various control functions and is connected to multiple base stations.

[0042] FIG. 2 is a diagram illustrating a wireless protocol structure in an LTE system according to an embodiment of the present disclosure.

[0043] Referring to Figure 2, the wireless protocol of the LTE system consists of PDCP (Packet Data Convergence Protocol 2-05, 2-40), RLC (Radio Link Control 2-10, 2-35), and MAC (Medium Access Control 2-15, 2-30) in the terminal and ENB, respectively. PDCP (Packet Data Convergence Protocol) (2-05, 2-40) is responsible for operations such as IP header compression / decompression. The main functions of PDCP (2b-05, 2b-40) are summarized as follows.

[0044] - Header compression and decompression (ROHC only)

[0045] - User data transfer function

[0046] - In-sequence delivery of upper layer (protocol data units (PDUs) at PDCP re-establishment procedure for RLC acknowledged mode (AM))

[0047] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0048] - Duplicate detection of lower layer service data units (SDUs) at PDCP re-establishment procedure for RLC AM

[0049] - Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

[0050] - Encryption and decryption functions (Ciphering and deciphering)

[0051] - Timer-based SDU discard in uplink.

[0052] RLC (2-10, 2-35) reconfigures PDCP PDU (Packet Data Unit) into an appropriate size and performs ARQ (automatic repeat request) operations, etc. The main functions of RLC (2-10, 2-35) are summarized as follows.

[0053] - Data transfer function (Transfer of upper layer PDUs)

[0054] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0055] - Concatenation, segmentation and reassembly of RLC SDUs (only for unacknowledged mode (UM) and AM data transfer)

[0056] - Re-segmentation of RLC data PDUs (only for AM data transfer)

[0057] - Reordering of RLC data PDUs (only for UM and AM data transfer)

[0058] - Duplicate detection (only for UM and AM data transfer)

[0059] - Error detection function (Protocol error detection (only for AM data transfer))

[0060] - RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

[0061] - RLC re-establishment function

[0062] MAC(2-15, 2-30) connects to multiple RLC layer devices configured in a single terminal, and performs the operation of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC(2-15, 2-30) are summarized as follows.

[0063] - Mapping function (Mapping between logical channels and transport channels)

[0064] - Multiplexing and demultiplexing function (Multiplexing / demultiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels)

[0065] - Scheduling information reporting function

[0066] - HARQ (hybrid automatic repeat request) function (Error correction through HARQ)

[0067] - Priority handling between logical channels of one UE

[0068] - Priority handling between UEs by means of dynamic scheduling

[0069] - MBMS service identification function

[0070] - Transport format selection function

[0071] - Padding function

[0072] The physical layer (2-20, 2-25) performs the operation of channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to the upper layer.

[0073] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0074] Referring to FIG. 3, as illustrated, the wireless access network of the next-generation mobile communication system (hereinafter referred to as NR or 2g) is composed of a next-generation base station (New Radio Node B, hereinafter referred to as NR gNB or NR base station) (3-10) and an NR CN (3-05, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter referred to as NR UE or terminal) (3-15) connects to an external network through the NR gNB (3-10) and the NR CN (3-05).

[0075] In Fig. 3, the NR gNB (3-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (3-15) via a wireless channel and can provide superior services than the existing Node B. In the next-generation mobile communication system, all user traffic is serviced through a shared channel, so a device that collects status information such as the buffer status of the UEs, the available transmission power status, and the channel status and performs scheduling is required, and the NR NB (3-10) is in charge of this. One NR gNB typically controls multiple cells. In order to implement ultra-high-speed data transmission compared to the current LTE, it can have a bandwidth higher than the existing maximum, and beamforming technology can be additionally grafted using orthogonal frequency division multiplexing (OFDM) as a wireless access technology. In addition, an adaptive modulation and coding (AMC) method that determines the modulation scheme and channel coding rate according to the channel status of the terminal is applied. NR CN (3-05) performs functions such as mobility support, bearer setup, and QoS (quality of service) setup. NR CN (3-05) is a device that handles not only mobility management for terminals but also various control functions and is connected to multiple base stations. Furthermore, the next-generation mobile communication system can also be interoperable with the existing LTE system, and NR CN (3-05) is connected to MME (3-25) via a network interface. MME (3-25) is connected to the existing base station, eNB (3-30).

[0076] FIG. 4 is a diagram illustrating a wireless protocol structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0077] FIG. 4 is a diagram showing a wireless protocol structure of a next-generation mobile communication system to which the present disclosure can be applied.

[0078] Referring to FIG. 4, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (4-01, 4-45), NR PDCP (4-05, 4-40), NR RLC (4-10, 4-35), and NR MAC (4-15, 4-30) in the terminal and NR base station, respectively.

[0079] Key features of NR SDAP (4-01, 4-45) may include some of the following:

[0080] - Transfer of user plane data

[0081] - Mapping function between QoS flow and data bearer for both DL and UL

[0082] - QoS flow ID marking function for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0083] - Ability to map relective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0084] For the above SDAP layer device, the terminal can be configured by RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can be instructed to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink with the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0085] The main functions of NR PDCP (4-05, 4-40) may include some of the following functions:

[0086] Header compression and decompression (ROHC only)

[0087] - User data transfer function

[0088] - In-sequence delivery of upper layer PDUs

[0089] - Out-of-sequence delivery of upper layer PDUs

[0090] - PDCP PDU reordering for reception

[0091] - Duplicate detection of lower layer SDUs

[0092] - Retransmission function (Retransmission of PDCP SDUs)

[0093] - Encryption and decryption functions (Ciphering and deciphering)

[0094] - Timer-based SDU discard in uplink.

[0095] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or may include a function of transmitting data directly without considering the order, may include a function of recording lost PDCP PDUs by reordering the order, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0096] The main functions of NR RLC(4-10, 4-35) may include some of the following functions:

[0097] - Data transfer function (Transfer of upper layer PDUs)

[0098] - In-sequence delivery of upper layer PDUs

[0099] - Out-of-sequence delivery of upper layer PDUs

[0100] - ARQ function (Error Correction through ARQ)

[0101] - Concatenation, segmentation and reassembly of RLC SDUs

[0102] - Re-segmentation of RLC data PDUs

[0103] - Reordering of RLC data PDUs

[0104] - Duplicate detection function

[0105] - Protocol error detection

[0106] - RLC SDU discard function

[0107] - RLC re-establishment function

[0108] The in-sequence delivery function of the NR RLC device above refers to the function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and may include a function of reassembling and transmitting RLC SDUs when an RLC SDU is originally received divided into multiple RLC SDUs, may include a function of reordering received RLC PDUs based on RLC SN (sequence number) or PDCP SN (sequence number), may include a function of recording lost RLC PDUs by reordering the sequence, may include a function of reporting the status of lost RLC PDUs to the transmitting side, may include a function of requesting retransmission of lost RLC PDUs, may include a function of sequentially transmitting only RLC SDUs up to the lost RLC SDU to an upper layer when there is a lost RLC SDU, or may include a function of sequentially transmitting all RLC SDUs received before the timer starts when a predetermined timer expires even when there is a lost RLC SDU. Or, even if there are lost RLC SDUs, if a predetermined timer has expired, it may include a function to sequentially deliver all RLC SDUs received up to the upper layer. In addition, the RLC PDUs may be processed in the order they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of sequence (out-of-sequence delivery). In case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the above function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0109] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when an original RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of received RLC PDUs and arranging the order to record lost RLC PDUs.

[0110] NR MAC (4-15, 4-30) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0111] - Mapping function (Mapping between logical channels and transport channels)

[0112] - Multiplexing / demultiplexing of MAC SDUs

[0113] - Scheduling information reporting function

[0114] - HARQ function (Error correction through HARQ)

[0115] - Priority handling between logical channels of one UE

[0116] - Priority handling between UEs by means of dynamic scheduling

[0117] - MBMS service identification function

[0118] - Transport format selection function

[0119] - Padding function

[0120] The NR PHY layer (4-20, 4-25) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

[0121] FIG. 5 is a diagram illustrating a procedure for a terminal in an RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) to reselect a cell for periodically transmitting essential system information in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0122] A cell according to the present disclosure is characterized by periodically transmitting essential system information, which refers to a master information block (MIB) and a system information block 1 (SIB1). The essential system information includes configuration information required for a terminal to select or camp on a cell.

[0123] The cell reselection evaluation procedure may refer to a procedure for determining whether to maintain the current serving cell or reselect a cell to a neighbor cell when the service quality of the serving cell on which the terminal is currently camped becomes lower than the service quality of the neighbor cell due to a predetermined reason or movement, when the terminal is in RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE).

[0124] In the case of handover, whether or not to perform a handover is determined by the network (AMF (access and mobility management function) or source gNB), whereas in the case of cell reselection, a terminal in RRC idle mode or RRC inactive state can determine whether or not to perform a cell reselection on its own based on cell measurement values. The cell to be reselected by the terminal may refer to a cell using the same NR frequency (NR intra-frequency or serving NR frequency) as the serving cell on which it is currently camping, a cell using a different NR frequency (NR inter-frequency) from the serving cell, or a cell on a frequency using a different radio access technology (RAT) (inter-RAT frequency).

[0125] Referring to FIG. 5, the terminal (5-01) may be in RRC connected mode (RRC_CONNECTED) by establishing an RRC connection with an NR cell (5-02) (5-03).

[0126] The NR cell (5-02) may transmit (5-04) an RRC release message (RRCRelease) to release the RRC connection with the terminal (5-01) in the RRC connected mode. If the message includes suspension configuration information (suspendConfig), the terminal (5-01) may transition (5-05) to an RRC inactive mode (RRC_INACTIVE). If the message does not include suspension configuration information, the terminal (5-01) may transition (5-05) to an RRC idle mode (RRC_IDLE). The message may include cellReselectionPriorities for the terminal (5-01) to perform cell reselection. cellReselectionPriorities may store at least one value among freqPriorityListEUTRA, freqPriorityListNR, and t320. The terminal (5-01) above can drive the T320 timer with the t320 value if it is included. Specifically, the configuration information included in the RRCRelease message may be as shown in Table 1 below.

[0127] RRCRelease ::= SEQUENCE {rrc-TransactionIdentifier RRC-TransactionIdentifier,criticalExtensions CHOICE {rrcRelease RRCRelease-IEs,criticalExtensionsFuture SEQUENCE {}}}RRCRelease-IEs ::= SEQUENCE {redirectedCarrierInfo RedirectedCarrierInfo OPTIONAL, -- Need NcellReselectionPriorities CellReselectionPriorities OPTIONAL, -- Need RsuspendConfig SuspendConfig OPTIONAL, -- Need RdeprioritisationReq SEQUENCE {deprioritisationType ENUMERATED {frequency, nr},deprioritisationTimer ENUMERATED {min5, min10, min15, min30}} OPTIONAL, -- Need NlateNonCriticalExtension OCTET STRING OPTIONAL,nonCriticalExtension RRCRelease-v1540-IEs OPTIONAL}RRCRelease-v1540-IEs ::= SEQUENCE {waitTime RejectWaitTime OPTIONAL, -- Need NnonCriticalExtension RRCRelease-v1610-IEs OPTIONAL}RedirectedCarrierInfo ::= CHOICE {nr CarrierInfoNR,eutra RedirectedCarrierInfo-EUTRA,...}RedirectedCarrierInfo-EUTRA ::= SEQUENCE {eutraFrequency ARFCN-ValueEUTRA,cnType ENUMERATED {epc,fiveGC} OPTIONAL -- Need N}CarrierInfoNR ::= SEQUENCE {carrierFreq ARFCN-ValueNR,ssbSubcarrierSpacing SubcarrierSpacing,smtc SSB-MTC OPTIONAL, -- Need S...}SuspendConfig ::= SEQUENCE {fullI-RNTI I-RNTI-Value,shortI-RNTI ShortI-RNTI-Value,ran-PagingCycle PagingCycle,ran-NotificationAreaInfo RAN-NotificationAreaInfo OPTIONAL, -- Need Mt380 PeriodicRNAU-TimerValue OPTIONAL, -- Need RnextHopChainingCount NextHopChainingCount,...,[[sl-ServingCellInfo-r17 SL-ServingCellInfo-r17 OPTIONAL, -- Cond L2RemoteUEsdt-Config-r17 SetupRelease { SDT-Config-r17} OPTIONAL, -- Need Msrs-PosRRC-InactiveConfig-r17 SRS-PosRRC-InactiveConfig-r17 OPTIONAL, -- Need Mran-ExtendedPagingCycle-r17 ExtendedPagingCycle-r17 OPTIONAL -- Need R]]}PeriodicRNAU-TimerValue ::= ENUMERATED { min5, min10, min20, min30, min60, min120, min360, min720}CellReselectionPriorities ::= SEQUENCE {freqPriorityListEUTRA FreqPriorityListEUTRA OPTIONAL, -- Need MfreqPriorityListNR FreqPriorityListNR OPTIONAL, -- Need Mt320 ENUMERATED {min5, min10, min20, min30, min60, min120, min180, spare1} OPTIONAL, -- Need R...,[[freqPriorityListNRSlicing-r17 FreqPriorityListNRSlicing-r17 OPTIONAL -- Need M]]}PagingCycle ::= ENUMERATED {rf32, rf64, rf128, rf256}ExtendedPagingCycle-r17 ::= ENUMERATED {rf256, rf512, rf1024, spare1}FreqPriorityListEUTRA ::= SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityEUTRAFreqPriorityListNR ::= SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityNRFreqPriorityEUTRA ::= SEQUENCE {carrierFreq ARFCN-ValueEUTRA,cellReselectionPriority CellReselectionPriority,cellReselectionSubPriority CellReselectionSubPriority OPTIONAL -- Need R}FreqPriorityNR ::= SEQUENCE {carrierFreq ARFCN-ValueNR,cellReselectionPriority CellReselectionPriority,cellReselectionSubPriority CellReselectionSubPriority OPTIONAL -- Need R}RAN-NotificationAreaInfo ::= CHOICE {cellList PLMN-RAN-AreaCellList,ran-AreaConfigList PLMN-RAN-AreaConfigList,...}PLMN-RAN-AreaCellList ::= SEQUENCE (SIZE (1.. maxPLMNIdentities)) OF PLMN-RAN-AreaCellPLMN-RAN-AreaCell ::= SEQUENCE {plmn-Identity PLMN-Identity OPTIONAL, -- Need Sran-AreaCells SEQUENCE (SIZE (1..32)) OF CellIdentity}PLMN-RAN-AreaConfigList ::= SEQUENCE (SIZE (1..maxPLMNIdentities)) OF PLMN-RAN-AreaConfigPLMN-RAN-AreaConfig ::= SEQUENCE {plmn-Identity PLMN-Identity OPTIONAL, -- Need Sran-Area SEQUENCE (SIZE (1..16)) OF RAN-AreaConfig}RAN-AreaConfig ::= SEQUENCE {trackingAreaCode TrackingAreaCode,ran-AreaCodeList SEQUENCE (SIZE (1..32)) OF RAN-AreaCode OPTIONAL -- Need R}.

[0128] In step 5-13, a terminal (5-01) in RRC idle mode or RRC deactivation state can obtain essential system information from an NR cell (5-02). In various embodiments of the present disclosure, the essential system information may include at least one of MIB or SIB1.

[0129] In step 5-15, the terminal (5-01) in the RRC idle mode or RRC deactivation state can perform a cell selection procedure based on the essential system information acquired in step 5-13. That is, the terminal (5-01) can find an NR suitable cell belonging to the selected public land mobile network (PLMN) or standalone non-public network (SNPN) and camp on the cell. The cell on which the terminal (5-01) camps on can be defined as a serving cell. In various embodiments of the present disclosure, a suitable cell can be defined if the conditions of Table 2 below are satisfied.

[0130] suitable cell:For UE not operating in SNPN Access Mode, a cell is considered as suitable if the following conditions are fulfilled:-The cell is part of either the selected PLMN or the registered PLMN or PLMN of the Equivalent PLMN list, and for that PLMN either:-The PLMN-ID of that PLMN is broadcast by the cell with no associated CAG-IDs and CAG-only indication in the UE for that PLMN (TS 23.501

[0010] ) is absent or false;-Allowed CAG list in the UE for that PLMN (TS 23.501

[0010] ) includes a CAG-ID broadcast by the cell for that PLMN;-The cell selection criteria are fulfilled, see clause 5.2.3.2.According to the latest information provided by NAS:-The cell is not barred, see clause 5.3.1;-The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming" (TS 22.011

[0018] ), which belongs to a PLMN that fulfils the first bullet above.For UE operating in SNPN Access Mode, a cell is considered as suitable if the following conditions are fulfilled:-The cell is part of either the selected SNPN or the registered SNPN of the UE;-The cell selection criteria are fulfilled, see clause 5.2.3.2;According to the latest information provided by NAS:-The cell is not barred, see clause 5.3.1;-The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming" which belongs to either the selected SNPN or the registered SNPN of the UE.

[0131] For reference, the terminal (5-01) can be determined to have satisfied the cell selection criteria if the following mathematical expression 1 is satisfied. Refer to Table 3 below for an explanation of the parameters included in mathematical expression 1.

[0132] [Mathematical Formula 1]

[0133] Srxlev > 0 AND Squal > 0

[0134] where

[0135] Srxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset ) - P compensation - -Qoffset temp,

[0136] Squal = Q qualmeas - (Q qualmin + Q qualminoffset) - Qoffset temp.

[0137] SrxlevCell selection RX level value (dB)SqualCell selection quality value (dB)Qoffset temp Offset temporarily applied to a cell as specified in TS 38.331 [3] (dB)Q rxlevmeas Measured cell RX level value (RSRP)Q qualmeas Measured cell quality value (RSRQ)Q rxlevmin Minimum required RX level in the cell (dBm). If the UE supports SUL frequency for this cell, Q rxlevmin is obtained from q-RxLevMinSUL, if present, in SIB1, SIB2 and SIB4, additionally, if QrxlevminoffsetcellSULis present in SIB3 and SIB4 for the concerned cell, this cell specific offset is added to the corresponding Qrxlevmin to achieve the required minimum RX level in the concerned cell;else Q rxlevmin is obtained from q-RxLevMin in SIB1, SIB2 and SIB4, additionally, if Q rxlevminoffsetcellis present in SIB3 and SIB4 for the concerned cell, this cell specific offset is added to the corresponding Qrxlevmin to achieve the required minimum RX level in the concerned cell.Q qualmin Minimum required quality level in the cell (dB). Additionally, if Q qualminoffsetcell is signalled for the concerned cell, this cell specific offset is added to achieve the required minimum quality level in the concerned cell.Q rxlevminoffset Offset to the signalled Q rxlevmin taken into account in the Srxlev evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN, as specified in TS 23.122 [9].Q qualminoffset Offset to the signalled Q qualmin taken into account in the Squal evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN, as specified in TS 23.122 [9].P compensation For FR1, if the UE supports the additionalPmax in the NR-NS-PmaxList, if present, in SIB1, SIB2 and SIB4:max(P EMAX1 -PPowerClass , 0) - (min(P EMAX2 , P PowerClass ) - min(P EMAX1 , P PowerClass )) (dB);else:max(P EMAX1 -P PowerClass , 0) (dB)For FR2, P compensation is set to 0.For IAB-MT, P compensation is set to 0.P EMAX1 , P EMAX2 Maximum TX power level of a UE may use when transmitting on the uplink in the cell (dBm) defined as P EMAX in TS 38.101

[0015] . If UE supports SUL frequency for this cell, P EMAX1 and P EMAX2 are obtained from the p-Max for SUL in SIB1 and NR-NS-PmaxList for SUL respectively in SIB1, SIB2 and SIB4 as specified in TS 38.331 [3], else P EMAX1 and P EMAX2 are obtained from the p-Max and NR-NS-PmaxList respectively in SIB1, SIB2 and SIB4 for normal UL as specified in TS 38.331 [3].P PowerClass Maximum RF output power of the UE (dBm) according to the UE power class as defined in TS 38.101-1

[0015] .

[0138] In step 5-20, the terminal (5-01) in RRC idle mode or RRC deactivation state can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5) containing cell reselection information from the serving cell (5-02) to perform a cell reselection evaluation procedure. SIB2 may include information / parameters commonly applied to the RRC terminal (5-01) to reselect NR intra-frequency, NR inter-frequency, and inter-RAT frequency cells, and NR intra-frequency cell reselection information excluding information related to NR intra-frequency neighboring cells. For example, SIB2 may include one cell reselection priority setting information for a serving NR frequency (the frequency to which the currently camped-on cell belongs). The cell reselection priority setting information may mean cellReselectionPriority and cellReselectionSubPriority. Specifically, cellReselectionPriority can store an integer value (for example, an integer value from 0 to 7), and cellReselectionSubPriority can store a decimal value (for example, a decimal value from 0.2, 0.4, 0.6, 0.8). If both cellReselectionPriority and cellReselectionSubPriority are signaled, the terminal (5-01) can derive a cell reselection priority value by adding the two values. For reference, a larger cell reselection priority value indicates a higher priority. Specifically, the cell reselection configuration information broadcasted in SIB2 can be as shown in Table 4 below.

[0139] SIB2 ::= SEQUENCE {cellReselectionInfoCommon SEQUENCE {nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need SabsThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need SrangeToBestCell RangeToBestCell OPTIONAL, -- Need Rq-Hyst ENUMERATED {dB0, dB1, dB2, dB3, dB4, dB5, dB6, dB8, dB10,dB12, dB14, dB16, dB18, dB20, dB22, dB24},speedStateReselectionPars SEQUENCE {mobilityStateParameters MobilityStateParameters,q-HystSF SEQUENCE {sf-Medium ENUMERATED {dB-6, dB-4, dB-2, dB0},sf-High ENUMERATED {dB-6, dB-4, dB-2, dB0}}} OPTIONAL, -- Need R...},cellReselectionServingFreqInfo SEQUENCE {s-NonIntraSearchP ReselectionThreshold OPTIONAL, -- Need Ss-NonIntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need SthreshServingLowP ReselectionThreshold,threshServingLowQ ReselectionThresholdQ OPTIONAL, -- Need RcellReselectionPriority CellReselectionPriority,cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need R...},intraFreqCellReselectionInfo SEQUENCE {q-RxLevMin Q-RxLevMin,q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need Rq-QualMin Q-QualMin OPTIONAL, -- Need Ss-IntraSearchP ReselectionThreshold,s-IntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need St-ReselectionNR T-Reselection,frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Need SfrequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need Rp-Max P-Max OPTIONAL, -- Need Ssmtc SSB-MTC OPTIONAL, -- Need Sss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, -- Need Rssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need SderiveSSB-IndexFromCell BOOLEAN,...,[[t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL -- Need N]],[[smtc2-LP-r16 SSB-MTC2-LP-r16 OPTIONAL, -- Need Rssb-PositionQCL-Common-r16 SSB-PositionQCL-Relation-r16 OPTIONAL -- Cond SharedSpectrum]]},...,[[relaxedMeasurement-r16 SEQUENCE {lowMobilityEvaluation-r16 SEQUENCE {s-SearchDeltaP-r16 ENUMERATED {dB3, dB6, dB9, dB12, dB15,spare3, spare2, spare1},t-SearchDeltaP-r16 ENUMERATED {s5, s10, s20, s30, s60, s120, s180,s240, s300, spare7, spare6, spare5,spare4, spare3, spare2, spare1}} OPTIONAL, -- Need RcellEdgeEvaluation-r16 SEQUENCE {s-SearchThresholdP-r16 ReselectionThreshold,s-SearchThresholdQ-r16 ReselectionThresholdQ OPTIONAL -- Need R} OPTIONAL, -- Need RcombineRelaxedMeasCondition-r16 ENUMERATED {true} OPTIONAL, -- Need RhighPriorityMeasRelax-r16 ENUMERATED {true} OPTIONAL -- Need R} OPTIONAL -- Need R]]}RangeToBestCell ::= Q-OffsetRange.

[0140] SIB3 may include neighboring cell information / parameters for a UE (5-01) in RRC idle mode or RRC inactive state to reselect an NR intra-frequency cell. For example, SIB3 may broadcast an NR intra-frequency cell list (intraFreqNeighCellList) for reselecting an NR intra-frequency cell, a cell list for which NR intra-frequency cell reselection is allowed (intraFreqAllowedCellList), and a cell list for which NR intra-frequency cell reselection is not allowed (intraFreqExcludedCellList). Specifically, SIB3 may broadcast the information in Table 5 below.

[0141] SIB3 ::= SEQUENCE {intraFreqNeighCellList IntraFreqNeighCellList OPTIONAL, -- Need RintraFreqExcludedCellList IntraFreqExcludedCellList OPTIONAL, -- Need RlateNonCriticalExtension OCTET STRING OPTIONAL,...,[[intraFreqNeighCellList-v1610 IntraFreqNeighCellList-v1610 OPTIONAL, -- Need RintraFreqAllowedCellList-r16 IntraFreqAllowedCellList-r16 OPTIONAL, -- Cond SharedSpectrum2intraFreqCAG-CellList-r16 SEQUENCE (SIZE (1..maxPLMN)) OF IntraFreqCAG-CellListPerPLMN-r16 OPTIONAL -- Need R]]}IntraFreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellIntra)) OF IntraFreqNeighCellInfoIntraFreqNeighCellList-v1610::= SEQUENCE (SIZE (1..maxCellIntra)) OF IntraFreqNeighCellInfo-v1610IntraFreqNeighCellInfo ::= SEQUENCE {physCellId PhysCellId,q-OffsetCell Q-OffsetRange,q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need Rq-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, -- Need Rq-QualMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R...}IntraFreqNeighCellInfo-v1610 ::= SEQUENCE {ssb-PositionQCL-r16 SSB-PositionQCL-Relation-r16 OPTIONAL -- Cond SharedSpectrum2}IntraFreqExcludedCellList ::= SEQUENCE (SIZE (1..maxCellExcluded)) OF PCI-RangeIntraFreqAllowedCellList-r16 ::= SEQUENCE (SIZE (1..maxCellAllowed)) OF PCI-RangeIntraFreqCAG-CellListPerPLMN-r16 ::= SEQUENCE {plmn-IdentityIndex-r16 INTEGER (1..maxPLMN),cag-CellList-r16 SEQUENCE (SIZE (1..maxCAG-Cell-r16)) OF PCI-Range}.

[0142] SIB4 may include information / parameters for a UE (5-01) in RRC idle mode or RRC inactive state to reselect an NR inter-frequency cell. For example, SIB4 may broadcast one or more NR inter-frequencies, and may broadcast one cell reselection priority setting information for each NR inter-frequency. The cell reselection priority setting information for each NR inter-frequency means the above-described contents (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each NR inter-frequency), but has the characteristic that one cell reselection priority setting information for each inter-frequency is optionally broadcast. Specifically, SIB4 may broadcast the information in Table 6 below.

[0143] SIB4 ::= SEQUENCE {interFreqCarrierFreqList InterFreqCarrierFreqList,lateNonCriticalExtension OCTET STRING OPTIONAL,...,[[interFreqCarrierFreqList-v1610 InterFreqCarrierFreqList-v1610 OPTIONAL -- Need R]]}InterFreqCarrierFreqList ::= SEQUENCE (SIZE (1..maxFreq)) OF InterFreqCarrierFreqInfoInterFreqCarrierFreqList-v1610 ::= SEQUENCE (SIZE (1..maxFreq)) OF InterFreqCarrierFreqInfo-v1610InterFreqCarrierFreqInfo ::= SEQUENCE {dl-CarrierFreq ARFCN-ValueNR,frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Cond MandatoryfrequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need RnrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need SabsThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need Ssmtc SSB-MTC OPTIONAL, -- Need SssbSubcarrierSpacing SubcarrierSpacing,ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need SderiveSSB-IndexFromCell BOOLEAN,ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, -- Need Rq-RxLevMin Q-RxLevMin,q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need Rq-QualMin Q-QualMin OPTIONAL, -- Need Sp-Max P-Max OPTIONAL, -- Need St-ReselectionNR T-Reselection,t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL, -- Need SthreshX-HighP ReselectionThreshold,threshX-LowP ReselectionThreshold,threshX-Q SEQUENCE {threshX-HighQ ReselectionThresholdQ,threshX-LowQ ReselectionThresholdQ} OPTIONAL, -- Cond RSRQcellReselectionPriority CellReselectionPriority OPTIONAL, -- Need RcellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need Rq-OffsetFreq Q-OffsetRange DEFAULT dB0,interFreqNeighCellList InterFreqNeighCellList OPTIONAL, -- Need RinterFreqExcludedCellList InterFreqExcludedCellList OPTIONAL, -- Need R...}InterFreqCarrierFreqInfo-v1610 ::= SEQUENCE {interFreqNeighCellList-v1610 InterFreqNeighCellList-v1610 OPTIONAL, -- Need Rsmtc2-LP-r16 SSB-MTC2-LP-r16 OPTIONAL, -- Need RinterFreqAllowedCellList-r16 InterFreqAllowedCellList-r16 OPTIONAL,-- Cond SharedSpectrum2ssb-PositionQCL-Common-r16 SSB-PositionQCL-Relation-r16 OPTIONAL, -- Cond SharedSpectruminterFreqCAG-CellList-r16 SEQUENCE (SIZE (1..maxPLMN)) OF InterFreqCAG-CellListPerPLMN-r16 OPTIONAL -- Need R}InterFreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellInter)) OF InterFreqNeighCellInfoInterFreqNeighCellList-v1610 ::= SEQUENCE (SIZE (1..maxCellInter)) OF InterFreqNeighCellInfo-v1610InterFreqNeighCellInfo ::= SEQUENCE {physCellId PhysCellId,q-OffsetCell Q-OffsetRange,q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need Rq-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, -- Need Rq-QualMinOffsetCell INTEGER (1..8) OPTIONAL,-- Need R...}InterFreqNeighCellInfo-v1610 ::= SEQUENCE {ssb-PositionQCL-r16 SSB-PositionQCL-Relation-r16 OPTIONAL -- Cond SharedSpectrum2}InterFreqExcludedCellList ::= SEQUENCE (SIZE (1..maxCellExcluded)) OF PCI-RangeInterFreqAllowedCellList-r16 ::= SEQUENCE (SIZE (1..maxCellAllowed)) OF PCI-RangeInterFreqCAG-CellListPerPLMN-r16 ::= SEQUENCE {plmn-IdentityIndex-r16 INTEGER (1..maxPLMN),cag-CellList-r16 SEQUENCE (SIZE (1..maxCAG-Cell-r16)) OF PCI-Range},

[0144] SIB5 may include information / parameters for a terminal (5-01) in RRC idle mode or RRC inactive state to reselect an inter-RAT frequency cell. For example, SIB5 may broadcast one or more EUTRA frequencies, and may broadcast one piece of cell reselection priority setting information for each EUTRA frequency. The cell reselection priority setting information for each EUTRA frequency refers to the above-described content (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each EUTRA frequency), but has the characteristic that one piece of cell reselection priority setting information for each EUTRA frequency is optionally broadcast. Specifically, SIB5 may broadcast the information in Table 7 below.

[0145] SIB5 ::= SEQUENCE {carrierFreqListEUTRA CarrierFreqListEUTRA OPTIONAL, -- Need Rt-ReselectionEUTRA T-Reselection,t-ReselectionEUTRA-SF SpeedStateScaleFactors OPTIONAL, -- Need SlateNonCriticalExtension OCTET STRING OPTIONAL,...,[[carrierFreqListEUTRA-v1610 CarrierFreqListEUTRA-v1610 OPTIONAL -- Need R]]}CarrierFreqListEUTRA ::= SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRACarrierFreqListEUTRA-v1610 ::= SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA-v1610CarrierFreqEUTRA ::= SEQUENCE {carrierFreq ARFCN-ValueEUTRA,eutra-multiBandInfoList EUTRA-MultiBandInfoList OPTIONAL, -- Need Reutra-FreqNeighCellList EUTRA-FreqNeighCellList OPTIONAL, -- Need Reutra-ExcludedCellList EUTRA-FreqExcludedCellList OPTIONAL, -- Need RallowedMeasBandwidth EUTRA-AllowedMeasBandwidth,presenceAntennaPort1 EUTRA-PresenceAntennaPort1,cellReselectionPriority CellReselectionPriority OPTIONAL, -- Need RcellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need RthreshX-High ReselectionThreshold,threshX-Low ReselectionThreshold,q-RxLevMin INTEGER (-70..-22),q-QualMin INTEGER (-34..-3),p-MaxEUTRA INTEGER (-30..33),threshX-Q SEQUENCE {threshX-HighQ ReselectionThresholdQ,threshX-LowQ ReselectionThresholdQ} OPTIONAL -- Cond RSRQ}CarrierFreqEUTRA-v1610 ::= SEQUENCE {highSpeedEUTRACarrier-r16 ENUMERATED {true} OPTIONAL -- Need R}EUTRA-FreqExcludedCellList ::= SEQUENCE (SIZE (1..maxEUTRA-CellExcluded)) OF EUTRA-PhysCellIdRangeEUTRA-FreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellEUTRA)) OF EUTRA-FreqNeighCellInfoEUTRA-FreqNeighCellInfo ::= SEQUENCE {physCellId EUTRA-PhysCellId,dummy EUTRA-Q-OffsetRange,q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need Rq-QualMinOffsetCell INTEGER (1..8) OPTIONAL -- Need R}.

[0146] In the present disclosure, it is further proposed that a list of cells transmitting SIB1 on-demand for each frequency be signaled in the system information. Specifically, a list of cells for each frequency may be broadcasted in the system information, which may refer to a list of cells transmitting SIB1 on-demand. For example, SIB3 may include a list of cells transmitting SIB1 on-demand on the frequency to which the current serving cell belongs, and SIB4 may include a list of cells transmitting SIB1 on-demand for each adjacent NR frequency. Of course, the above-described content (list of cells transmitting SIB1 on-demand for each frequency) may also be signaled through new system information. A terminal (5-01) that receives the above-described cell list (list of cells transmitting SIB1 on-demand for each frequency) may exclude the corresponding cells as cell reselection candidates in the cell reselection evaluation procedure to be described later.

[0147] After receiving the above system information, the terminal (5-01) in the RRC idle mode or RRC deactivation state can perform a cell reselection evaluation process. The cell reselection evaluation process may refer to a series of processes for determining reselection priorities, performing frequency measurements by applying measurement rules for cell reselection, and evaluating cell reselection criteria to reselect a cell.

[0148] In step 5-25, the terminal (5-01) in the RRC idle mode or RRC disabled state can determine the reselection priority based on the RRC release message received in step 5-04 or the system information received in step 5-20. If the RRC release message received in step 5-04 includes cellReselectionPriorities and the cellReselectionPriorities does not have a t320 timer value or the t320 timer value is set and the T320 timer is running, the terminal (5-01) can determine the reselection priority according to the RRC release message. That is, if the celllReselectionPriorities included in the RRC release message can be applied, the terminal (5-01) can determine the reselection priority according to the RRC release message. If the RRC release message does not include cellReselectionPriorities or if cellReselectionPriorities is released, the terminal (5-01) can determine the reselection priority based on the system information received in step 5-20. The terminal (5-01) according to the present disclosure can determine, based on the cell reselection priority value mapped to the NR frequency to which the serving cell currently camped on belongs, whether the cell reselection priority for each NR inter-frequency or inter-RAT frequency has the same cell reselection priority as the NR frequency to which the serving cell belongs, has a cell reselection priority higher than the NR frequency to which the serving cell belongs, or has a cell reselection priority lower than the NR frequency to which the serving cell belongs.For example, if the cell reselection priority value mapped to the NR frequency to which the serving cell currently camped on belongs in the system information acquired in step 5-20 is 3, the cell reselection priority value of inter NR frequency 1 is 2, the cell reselection priority value of inter NR frequency 2 is 3, the cell reselection priority value of inter NR frequency 3 is 4, and the cell reselection priority value of EUTRA frequency 1 is 2, the terminal (5-01) may determine inter NR frequency 1 and EUTRA frequency 1 to have lower cell reselection priorities, determine the cell reselection priorities of inter NR frequency 2 to be equal (equal reselection priority), and determine the cell reselection priority of inter NR frequency 3 to have higher cell reselection priorities.

[0149] In step 5-30, a terminal (5-01) in RRC idle mode or RRC inactive state can perform frequency measurement for cell reselection. At this time, the terminal (5-01) can perform frequency measurement using the following measurement rule according to the cell reselection priority determined in step 5-25 to minimize battery consumption.

[0150] - The terminal (5-01) may not perform NR intra-frequency measurement if the following condition 1 is satisfied. Otherwise (for example, if the following condition 1 is not satisfied), the terminal performs NR intra-frequency measurement.

[0151] ■ Condition 1: The reception level (Srxlev) of the serving cell is greater than the SIntraSearchP threshold and the reception quality (Squal) of the serving cell is greater than the SIntraSearchQ threshold (Serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ).

[0152] - The terminal can perform measurements according to the 3GPP TS 38.133 standard for NR inter-frequency or inter-RAT frequency that has a higher reselection priority than the NR frequency of the current serving cell.

[0153] - For an NR inter-frequency having a reselection priority lower than or equal to the NR frequency of the current serving cell and an inter-RAT frequency having a reselection priority lower than the NR frequency of the current serving cell, the terminal may not perform measurement if Condition 2 below is satisfied. Otherwise (for example, if Condition 2 below is not satisfied), the terminal measures cells in an NR inter-frequency having a reselection priority lower than or equal to the NR frequency or measures cells in an inter-RAT frequency having a reselection priority lower than the NR frequency.

[0154] ■ Condition 2: The reception level (Srxlev) of the serving cell is greater than the SnonIntraSearchP threshold and the reception quality (Squal) of the serving cell is greater than the SnonIntraSearchQ threshold (Serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ).

[0155] For reference, the aforementioned thresholds (SintraSearchP, SintraSearchQ, SnonIntraSearchP SnonintraSearchQ) can be broadcast in the system information acquired in steps 5-20.

[0156] In step 5-35, the terminal (5-01) in the RRC idle mode or RRC disabled state may decide to reselect a cell that satisfies the cell reselection criteria based on the measurement value performed in step 5-30. Different criteria may be applied to the cell reselection criteria depending on the cell reselection priority. If multiple cells that satisfy the cell reselection criteria have different cell reselection priorities, reselecting a frequency / RAT cell with a higher cell reselection priority takes precedence over reselecting a frequency / RAT cell with a lower priority. Specifically, the operation of the terminal (5-01) with respect to the reselection criteria of an inter-frequency / inter-RAT cell that has a higher priority than the frequency of the current serving cell is as follows.

[0157] - First movement:

[0158] ■ If SIB2 is broadcast with a threshold for threshServingLowQ and 1 second has passed since the terminal camped on the current serving cell, and the signal quality (Squal) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighQ during a specific time interval TreselectionRAT (Squal > ThreshX,HighQ during a time interval TreselectionRAT), the terminal performs reselection to the inter-frequency / inter-RAT cell.

[0159] - Second movement:

[0160] ■ If the above terminal cannot perform the first operation, it performs the second operation.

[0161] ■ If 1 second has passed since the terminal camped on the current serving cell and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighP during a specific time interval TreselectionRAT (Srxlev > ThreshX, HighP during a time interval Treselection-RAT-), the terminal performs reselection to the inter-frequency / inter-RAT cell.

[0162] Here, the terminal (5-01) is configured to measure the signal quality (Squal), reception level (Srxlev), and threshold values ​​(Threh) of the inter-frequency cell. X, HighQ , Thresh X, HighP ), Treselection RAT The values ​​perform the first or second operation based on the information contained in SIB4 broadcast from the serving cell, and the signal quality (Squal), reception level (Srxlev), and threshold (Thresh) of the inter-RAT cell. X,HighQ, Thresh X, HighP ), Treselection RATThe values ​​perform the first or second action based on the information contained in SIB5 broadcast from the serving cell. For example, SIB4 may include Q qualmin value or Q rxlevmin It includes values, etc., and derives the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell based on this. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal (5-01) can reselect the highest ranked cell among the cells that satisfy the reselection criteria of the intra-frequency / inter-frequency cell that has the same priority as the frequency of the current serving cell described below.

[0163] In addition, the operation of the terminal (5-01) for the reselection criteria of the intra-frequency / inter-frequency cell having the same priority as the frequency of the current serving cell is as follows.

[0164] - Third movement:

[0165] ■ If the signal quality (Squal) and reception level (Srxlev) of an intra-frequency / inter-frequency cell are greater than 0, the cell-specific rank is derived based on the measured value (RSRP (reference signal received power)) (The UE shall perform ranking of all cells that fulfill the cell selection criterion S). The ranks of the serving cell and neighboring cells are each calculated using the following mathematical expression 2.

[0166] [Equation 2]

[0167] R s = Q meas,s + Q hyst - Qoffset temp

[0168] R n = Q meas,n - Qoffset - Qoffset temp

[0169] ● Here, Qmeas,s is the RSRP measurement value of the serving cell, Qmeas,n is the RSRP measurement value of the neighboring cells, Qhyst is the hysteresis value of the serving cell, and Qoffset is the offset between the serving cell and the neighboring cells. The Qhyst value is included in SIB2, and the value is commonly used for intra-frequency / inter-frequency cell reselection. In case of intra-frequency cell reselection, Qoffset is signaled per cell, applied only to the indicated cell, and included in SIB3. In case of inter-frequency cell reselection, Qoffset is signaled per cell, applied only to the indicated cell, and included in SIB4. If the Rank of the neighboring cell obtained from the above mathematical expression 2 is greater than the Rank of the serving cell (Rn > Rs), the optimal cell among the neighboring cells is reselected.

[0170] ● Here Qoffset- temp- - can mean connEstFailOffset included in ConnEstFailureControld broadcasted in SIB1 as an offset temporarily applied to the cell, and can be applied when RRC connection fails (e.g., when T300 timer expires).

[0171] Additionally, the operation of the terminal (5-01) for the reselection criteria of an inter-frequency / inter-RAT cell with a lower priority than the frequency of the current serving cell is as follows.

[0172] - 4th movement:

[0173] ■ If SIB2 is broadcast with a threshold for threshServingLowQ and 1 second has passed since the terminal camped on the current serving cell, if the signal quality (Sqaul) of the current serving cell is lower than the threshold ThreshServing, LowQ (Squal < ThreshServing, LowQ) and the signal quality (Squal) of the inter-frequency / inter-RAT cell is higher than the threshold ThreshX, LowQ- during a specific time interval TreselectionRAT (Squal > ThreshX,LowQ during a time interval TreselectionRAT), the terminal performs reselection to the inter-frequency / inter-RAT cell.

[0174] - Movement 5:

[0175] ■ If the above terminal cannot perform the 4th operation, it performs the 5th operation.

[0176] ■ If 1 second has passed since the terminal camped on the current serving cell, and the reception level (Srxlev) of the current serving cell is less than the threshold ThreshServing, LowP (Srxlev < ThreshServing, LowP) and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX, LowQ- during a specific time interval TreselectionRAT (Srxlev > ThreshX,LowP during a time interval TreselectionRAT), the terminal performs reselection to the inter-frequency / inter-RAT cell.

[0177] Here, the fourth or fifth operation for the inter-frequency cell of the terminal (5-01) is the thresholds (ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcasted in the serving cell and the signal quality (Squal), reception level (Srxlev), and thresholds (Threh) of the inter-frequency cell included in SIB4 broadcasted in the serving cell. X, LowQ, Thresh X, LowP ), Treselection RAT , and the fourth or fifth operation for the inter-RAT cell of the terminal (5-01) is performed based on the thresholds (ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcasted in the serving cell and the signal quality (Squal), reception level (Srxlev), and thresholds (Thresh) of the inter-RAT cell included in SIB5 broadcasted in the serving cell. X,LowQ , Thresh X, LowP ), Treselection RAT It is performed based on. For example, in SIB4, Q qualmin value or Q rxlevmin It includes values, etc., and derives the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell based on this. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal (5-01) can reselect the highest ranked cell among the cells that satisfy the reselection criteria of the intra-frequency / inter-frequency cell that has the same priority as the frequency of the current serving cell described below.

[0178] In step 5-40, a terminal (5-01) in an RRC idle mode or RRC inactive state receives system information (e.g., MIB or SIB1) broadcast from a candidate target cell before finally reselecting a candidate target cell, and determines based on the received system information whether the reception level (Srxlev) and reception quality (Squal) of the candidate target cell satisfy a cell selection criterion called S-criterion (Mathematical Formula 1) (Srxlev > 0 AND Squal > 0). If Mathematical Formula 1 is satisfied and the candidate target cell is suitable, the terminal can reselect the candidate target cell.

[0179] The various concepts described in FIG. 5 can also be applied to corresponding operations and corresponding messages in other embodiments of the present disclosure described below. For example, various messages and new information defined in FIG. 5 can be interpreted identically for the same messages in other embodiments described below. For example, camp-on, cell reselection evaluation procedure, cell selection procedure, etc. of FIG. 5 can be applied to corresponding operations in other embodiments described below. In addition, the concepts of broadcast / transmission can be used interchangeably with respect to system information in various embodiments of the present disclosure. In addition, although various embodiments of the present disclosure are described based on NR cells, this is for convenience of explanation, and it should be noted that NR cells can be used as general terms such as base station and cell.

[0180] FIG. 6 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0181] A given cell according to the present disclosure can periodically transmit essential system information including at least one of MIB and SIB1. The essential system information includes configuration information required for a terminal to select or camp on a cell. Additionally, a given cell according to the present disclosure has the characteristic that, unlike the above-described embodiment (FIG. 5), although it periodically transmits MIB, it can transmit SIB1 in an on-demand manner. The on-demand manner refers to a manner in which a base station broadcasts system information corresponding to a request from a terminal when there is a request from the terminal. This is because network energy saving (NES) can be achieved by transmitting SIB1 when there is a request from the terminal. Specifically, when a terminal needs to acquire SIB1 for a given reason (e.g., to select and / or reselect a cell), it can request broadcast / transmission of SIB1 to a cell that does not transmit SIB1, and the cell can then broadcast SIB1.

[0182] Referring to FIG. 6, the terminal (6-01) may be in RRC connected mode (RRC_CONNECTED) by establishing an RRC connection with an NR cell (6-05) (6-10).

[0183] In step 6-15, the terminal (6-01) may transmit a terminal capability information message (UECapabilityInformation) to the NR cell (6-05). The message may include capability information indicating that the terminal has the capability to transmit information (e.g., a wake-up signal (WUS)) for requesting transmission of SIB1 to a cell transmitting SIB1 on-demand. The term WUS is only an example and does not limit the indication of the capability for requesting SIB 1 on-demand.

[0184] In step 6-20, the NR cell (6-05) may transmit an RRC release message (RRCRelease) to release the RRC connection with the terminal (6-01) in RRC connection mode. The information included in the RRC release message may at least follow the embodiment of FIG. 5 described above. Additionally, the RRC release message may include at least one of the following:

[0185] - An indicator indicating whether the above terminal (6-01) can transmit WUS.

[0186] - Setting information required when the above terminal (6-01) transmits WUS

[0187] ■ The above setting information can be set by frequency or by cell per frequency.

[0188] ■ The above configuration information may refer to one or more random access preambles. For example, it may refer to a preamble indicating the first message (Msg1) sent during a random access procedure.

[0189] ■ The above configuration information may refer to one or more random access opportunities (PRACH (physical random access channel) occasions) for transmitting a preamble. For example, a RACH occasion may refer to an indication of a frequency / time at which a preamble will be transmitted during a random access procedure.

[0190] The terminal (6-01) in RRC connection mode can, after applying an RRC release message, transition (6-25) to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE) as in the above-described embodiment.

[0191] In step 6-30, a terminal (6-01) in RRC idle mode or RRC inactive state can obtain essential system information, MIB and SIB1, from an NR cell (6-05).

[0192] In step 6-35, the terminal (6-01) may perform a cell selection procedure based on step 6-30. This may follow the embodiment of FIG. 5 described above.

[0193] In step 6-40, the terminal (6-01) can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB) containing cell reselection information from the serving cell (6-05) to perform a cell reselection evaluation procedure. This can follow the embodiment of FIG. 5 described above. Additionally, the serving cell (6-05) according to the present disclosure can broadcast system information containing WUS configuration information. The serving cell (6-05) can include WUS configuration information in at least one of SIB2, SIB3, SIB4, and SIB5 or transmit WUS configuration information to the terminal (6-01) through new system information (new SIB). Specifically, the WUS configuration information can be included in the system information through one of the following methods.

[0194] - Method 1: WUS configuration per frequency

[0195] ■ The serving cell (6-05) can provide the terminal (6-01) with WUS configuration information for the serving frequency (NR intra-frequency) through SIB2 or SIB3, and with WUS configuration information for each adjacent NR frequency (NR inter-frequency) through SIB4. Of course, by defining new system information (new SIB), the serving cell (6-05) can also provide the terminal (6-01) with WUS configuration information for each frequency through the new system information.

[0196] - Method 2: WUS configuration per cell (or per cell list) per frequency

[0197] ■ The serving cell (6-05) can provide the terminal (6-01) with WUS configuration information per cell or per cell list in the serving frequency (NR intra-frequency) through SIB2 or SIB3, and with WUS configuration information per cell per adjacent NR frequency (NR inter-frequency) or per cell list per NR inter-frequency through SIB4. WUS configuration information per cell list may mean that cells composed of one or more cells share WUS configuration information. Of course, by defining new system information (new SIB), the serving cell (6-05) can also provide the terminal (6-01) with WUS configuration information per cell (or per cell list) frequency through the new system information.

[0198] For reference, the WUS configuration information may refer to configuration information required to transmit random access parameters and a random access preamble. For example, the WUS configuration information may refer to at least one of a random access preamble index (or index range), information on the number of SSBs (synchronization signal blocks) per PRACH Occasion, an RSRP threshold (rsrp-ThresholdSSB), and PRACH Occasion location information (information on which a preamble, which is a physical signal specifically designed for uplink synchronization, can be transmitted).

[0199] In step 6-45, the terminal (6-01) can determine a reselection priority for cell reselection. This can follow the embodiment described above (Fig. 5).

[0200] In step 6-47, a cell (6-07) transmitting SIB1 in an on-demand manner can transmit a synchronization signal, SSB (Synchronization Signal / PBCH block, hereinafter referred to as SSB).

[0201] In step 6-50, the terminal (6-01) may perform frequency measurement for cell reselection. This may follow the embodiment described above (Fig. 5).

[0202] In step 6-55, the terminal (6-01) can determine a candidate target cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 6-50. This can follow the embodiment described above (Fig. 5). Accordingly, the terminal according to the present disclosure can determine the final candidate target cell as the NR cell (6-07). That is, the NR cell (6-07) can be the best cell or the highest-ranked cell for the terminal (6-01).

[0203] In step 6-60, the terminal (6-01) can identify that the NR cell (6-07) is a cell that transmits SIB1 on-demand. The terminal (6-01) according to the present disclosure can identify this through at least one of the following methods.

[0204] - Method 1: The terminal (6-01) can confirm that the NR cell (6-07) transmits SIB1 on-demand through the MIB transmitted by the cell. For example, the terminal (6-01) can confirm that the NR cell (6-07) is a cell that transmits SIB1 on-demand through the ssb-SubcarrierOffset or spare value in the MIB.

[0205] - Method 2: Through step 6-20 or step 6-40, the terminal (6-01) can confirm that the NR cell (6-07) transmits SIB1 on-demand. For example, information that the NR cell transmits SIB1 on-demand can be included in an RRC release message (e.g., an RRC release message received in step 6-20) or system information (system information acquired in step 6-40).

[0206] - Method 3: The terminal (6-01) can receive a predetermined message containing WUS configuration information from the NR cell (6-07) and confirm that the cell transmits SIB1 on-demand.

[0207] In step 6-65, the terminal (6-01) may transmit a wake-up signal (WUS) to receive SIB1 from the NR cell (6-07). The terminal (6-01) may transmit the WUS based on the WUS configuration information received in step 6-20, step 6-40, or step 6-60. Note that WUS may also mean a preamble.

[0208] In step 6-70, the NR cell (6-07) that received the WUS from the terminal (6-01) can transmit SIB1, and the terminal (6-01) can receive SIB1 from the NR cell (6-07). For reference, the terminal (6-01) can receive the MIB transmitted by the NR cell (6-07) in step 6-70 or in a previous step (e.g., step 6-55 or step 6-60).

[0209] In step 6-75, the terminal (6-01) determines whether the reception level (Srxlev) and reception quality (Squal) of the candidate target cell (6-07) satisfy the cell selection criterion (Srxlev > 0 AND Squal > 0) called S-criterion (see Equation 1, Example 5 described above) based on the essential system information (MIB and SIB1) received from the candidate target cell. If the S-criterion is satisfied and the candidate target cell is suitable, the terminal (6-01) can reselect the candidate target cell.

[0210] FIG. 7 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0211] A given cell according to the present disclosure can periodically transmit essential system information including at least one of MIB and SIB1. The essential system information includes configuration information required for a terminal to select or camp on a cell. Additionally, a given cell according to the present disclosure, unlike the above-described embodiment (FIG. 5), has the characteristic of being able to transmit SIB1 in an on-demand manner, although it periodically transmits MIB. The on-demand manner refers to a manner in which a base station broadcasts system information corresponding to a request from a terminal when there is a request from the terminal. This is because network energy saving (NES) can be achieved by transmitting SIB1 when there is a request from the terminal. Specifically, when a terminal needs to acquire SIB1 for a given reason (e.g., to select and / or reselect a cell), the terminal can request broadcast / transmission of SIB1 to a cell that does not transmit SIB1, and the cell can then broadcast SIB1. Additionally, a cell capable of transmitting SIB1 on-demand according to the present disclosure has the characteristic of being able to inform a terminal capable of requesting SIB1 broadcast on-demand via MIB not to request SIB1 broadcast or that the cell is barred. Accordingly, the terminal has the characteristic of being able to exclude the cell as a candidate for cell selection or cell reselection.

[0212] Referring to FIG. 7, the terminal (7-01) may be in RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) (7-10).

[0213] In step 7-15, a terminal (7-01) in RRC idle mode or RRC deactivation state can obtain essential system information from an NR cell (7-05). In various embodiments of the present disclosure, the essential system information may include at least one of MIB or SIB1.

[0214] In step 7-20, the terminal (7-01) performs a cell selection procedure based on the essential system information acquired in step 7-15 to find an NR suitable cell (7-05) and camp on that cell. This may follow the embodiment of FIG. 5 described above.

[0215] In step 7-25, the terminal (7-01) can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB) containing cell reselection information from the serving cell (7-05) to perform a cell reselection evaluation procedure. Additionally, the serving cell (7-05) can broadcast system information containing WUS configuration information. Step 7-25 refers to the description of the embodiments of FIGS. 5 and 6 described above.

[0216] In step 7-30, the terminal (7-01) can determine a reselection priority for cell reselection. This can follow the embodiment of FIG. 5 described above.

[0217] In step 7-35, a cell (7-07) capable of transmitting SIB1 on-demand can transmit a synchronization signal, SSB (Synchronization Signal / PBCH block, hereinafter referred to as SSB), and MIB. For reference, the terminal (7-01) can obtain the MIB from the NR cell (7-07). For example, the terminal (7-01) can obtain the MIB of the NR cell (7-07) in step 7-50 or step 7-45.

[0218] In step 7-40, the terminal (7-01) may perform frequency measurement for cell reselection. This may follow the embodiment of FIG. 5 described above.

[0219] In step 7-45, the terminal (7-01) can determine a candidate target cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 7-40. This can follow the aforementioned embodiment (Fig. 5). Accordingly, the terminal (7-01) according to the present disclosure can determine the final candidate target cell as the NR cell (7-07). That is, the NR cell (7-07) can be the best cell or the highest-ranked cell for the terminal (7-01).

[0220] In step 7-50, the terminal (7-01) capable of requesting SIB1 broadcasting on-demand can determine whether the NR cell (7-07) capable of transmitting SIB1 on-demand is a barred cell or a cell capable of requesting transmission of SIB1. The terminal (7-01) according to the present disclosure can determine whether the NR cell (7-07) capable of transmitting SIB1 on-demand is a barred cell or a cell capable of requesting transmission of SIB1 through the MIB acquired from the NR cell (7-07). For example, if at least one of the following conditions is satisfied, the terminal (7-01) can determine whether the NR cell (7-07) capable of transmitting SIB1 on-demand is a barred cell or a cell capable of requesting transmission of SIB1.

[0221] - If cellBarred is set to barred in the MIB and pdcch-ConfigSIb1 indicates that SIB1 is not transmitted.

[0222] - If the NR cell (7-07) is a barred cell through the spare value in the MIB or if it is instructed not to request transmission of SIB1 on-demand.

[0223] In step 7-55, the terminal (7-01) may determine that the NR cell (7-07) in step 7-50 is a barred cell or a cell that cannot request SIB1 transmission. In this case, the terminal (7-01) may not request SIB1 transmission to the cell. Additionally, the terminal (7-01) may perform at least one of the following operations to bar the NR cell (7-07), which is determined to be a barred cell or cannot request SIB1 transmission, from being a candidate for cell selection or cell reselection.

[0224] - Action 1: The UE (7-01) may exclude the NR cell (7-07) as a candidate for cell selection or cell re-selection for up to a predetermined time (e.g., up to 300 seconds).

[0225] - Action 2: The UE (7-01) excludes the NR cell (7-07) as a candidate cell for cell selection or cell re-selection for a predetermined time (e.g., 300 seconds).

[0226] In step 7-60, the terminal (7-01) can determine whether cells operating at the same frequency as the NR cell (7-05) (intra-frequency cells) can be selected by applying at least one of the following methods.

[0227] - Method 1: IntraFreqReselection can be applied in the MIB acquired from the NR cell (7-05). Specifically, if intraFreqReselection is set to 'allowed', the UE (7-01) can select intra-frequency cells if cell re-selection conditions are fulfilled (UE may select another cell on the same frequency if re-selection criteria are fulfilled). If intraFreqReselection is set to 'not allowed', the UE (7-01) cannot select or re-select intra-frequency cells for a predetermined time (e.g., up to 300 seconds) or for up to a predetermined time (e.g., 300 seconds) (UE shall not re-select another cell on the same frequency as candidate(s) for cell (re-)selection for a predetermined time (e.g., 300s) seconds or for up to a predetermined time (e.g., 300s)).

[0228] - Method 2: The terminal (7-01) can select intra-frequency cells if the cell reselection conditions are met, regardless of whether the intraFreqReselection setting of the MIB obtained from the NR cell (7-05) is present (UE ignores intraFreqReselection in MIB and selects another cell on the same frequency if the re-selection criteria are fulfilled).

[0229] - Method 3: Regardless of whether the intraFreqReselection setting of the MIB acquired from the NR cell (7-05) is set, the terminal (7-01) cannot select or re-select intra-frequency cells for a predetermined time (e.g., up to 300 seconds) or for up to a predetermined time (300 seconds) (UE ignores intraFreqReselection in MIB and shall not re-select another cell on the same frequency as candidate(s) for cell (re-)selection for a predetermined time (e.g., 300s) or for up to a predetermined time (e.g., 300s))

[0230] FIG. 8 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0231] A given cell according to the present disclosure can periodically transmit essential system information including at least one of MIB and SIB1. The essential system information includes configuration information required for a terminal to select or camp on a cell. Additionally, a given cell according to the present disclosure, unlike the above-described embodiment (FIG. 5), has the characteristic of being able to transmit SIB1 in an on-demand manner, although it periodically transmits MIB. The on-demand manner refers to a manner in which a base station broadcasts system information corresponding to a request from a terminal when there is a request from the terminal. This is because network energy saving (NES) can be achieved by transmitting SIB1 when there is a request from the terminal. Specifically, when a terminal needs to acquire SIB1 for a given reason (e.g., to select and / or reselect a cell), the terminal can request broadcast / transmission of SIB1 to a cell that does not transmit SIB1, and the cell can then broadcast SIB1. Additionally, a cell capable of transmitting SIB1 on-demand according to the present disclosure has a feature that can provide information to a terminal that can request transmission of SIB1 on-demand, as to whether the cell is prohibited and / or whether other cells on the same frequency on which the cell is operating can be selected or reselected. Accordingly, the terminal can determine whether to select the cell and / or to select or reselect other cells on the same frequency on which the cell is operating based on the SIB1 information acquired on-demand.

[0232] Referring to FIG. 8, the terminal (8-01) may be in RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) (8-10).

[0233] In step 8-15, a terminal (8-01) in RRC idle mode or RRC deactivation state can obtain essential system information from an NR cell (8-05). In various embodiments of the present disclosure, the essential system information may include at least one of MIB or SIB1.

[0234] In step 8-20, the terminal (8-01) performs a cell selection procedure based on the essential system information acquired in step 8-15 to find an NR suitable cell (8-05) and camp on that cell. This may follow the embodiment of FIG. 5 described above.

[0235] In step 8-25, the terminal (8-01) can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB) containing cell reselection information from the serving cell (8-05) to perform a cell reselection evaluation procedure. Additionally, the serving cell (8-05) can broadcast system information containing WUS configuration information. Step 8-25 can follow at least one of the embodiments of FIGS. 5, 6, and 7 described above.

[0236] In step 8-30, the terminal (8-01) can determine a reselection priority for cell reselection. This can follow the embodiment of FIG. 5 described above.

[0237] In step 8-35, the cell (8-07) capable of transmitting SIB1 on-demand can transmit SSB, which is a synchronization signal, and MIB. For reference, the terminal (8-01) can obtain the MIB from the NR cell (8-07). For example, the terminal (8-01) can obtain the MIB of the NR cell (8-07) in step 8-50 or step 8-45. For reference, the terminal (8-01) capable of requesting transmission of SIB1 can ignore the fact that cellBarred is set to barred in the MIB broadcast by the NR cell (8-07). That is, the terminal (8-01) can determine whether to prohibit the NR cell (8-07) after obtaining SIB1 from the NR cell (8-07).

[0238] In step 8-40, the terminal (8-01) may perform frequency measurement for cell reselection. This may follow the embodiment of FIG. 5 described above.

[0239] In step 8-45, the terminal (8-01) can determine a candidate target cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 8-40. This can follow the aforementioned embodiment (Fig. 5). Accordingly, the terminal (8-01) according to the present disclosure can determine the final candidate target cell as the NR cell (8-07). That is, the NR cell (8-07) can be the best cell or the highest-ranked cell for the terminal (8-01).

[0240] At step 8-50, the terminal (8-01) can request broadcasting of SIB1 to the NR cell (8-07). That is, since the NR cell (8-07) is not periodically broadcasting SIB1, the terminal (8-01) can request broadcasting of SIB1 to the NR cell (8-07).

[0241] In step 8-55, the terminal (8-01) can obtain SIB1 from the NR cell (8-07). In the present disclosure, the SIB1 may include at least one of the following information.

[0242] - Barred for on-demand SIB1 cell: Information indicating whether the terminal (8-01) that can request transmission of SIB1 can select or reselect the NR cell (8-07). That is, if the Barred for on-demand SIB1 cell is set to notbarred (or if the information is empty), the terminal (8-01) can select or reselect the NR cell (8-07). On the other hand, if the Barred for on-demand SIB1 cell is barred, the terminal (8-01) can perform at least one of the following operations.

[0243] ■ Action 1: The UE (8-01) may exclude the NR cell (8-07) as a candidate for cell selection or cell re-selection for a predetermined time (e.g., up to 300 seconds).

[0244] ■ Action 2: The UE (8-01) excludes the NR cell (8-07) as a candidate for cell selection or cell re-selection for a predetermined time (e.g., 300 seconds).

[0245] - cellBarredNES: Information indicating whether the terminal (8-01) that can request transmission of SIB1 can select or reselect the NR cell (8-07). That is, if cellBarredNES is set to notbarred (or if the information is empty), the terminal (8-01) can select or reselect the NR cell (8-07). On the other hand, if cellBarredNES is set to barred, the terminal (8-01) can perform at least one of the above-described operations 1 or 2.

[0246] - intraFreqReselection-NES (or intraFreqReselection for on-demand SIB1 cell): Information indicating whether the UE (8-01) that can request transmission of SIB1 selects or reselects other cells operating on the same frequency as the NR cell (8-07). That is, if intraFreqReselection-NES is set to 'allowed', the UE (8-01) can select intra-frequency cells if cell reselection criteria are fulfilled (UE may select another cell on the same frequency if re-selection criteria are fulfilled). On the other hand, if intraFreqReselection-NES is set to 'not allowed', the terminal (8-01) may not select or re-select intra-frequency cells for a predetermined time (e.g., up to 300 seconds) or for up to a predetermined time (e.g., 300 seconds) (UE shall not re-select another cell on the same frequency as candidate(s) for cell (re-)selection for a predetermined time (e.g., 300s) or for up to a predetermined time (e.g., 300s)).

[0247] - If the intraFreqReselection-NES is not introduced in SIB1, the terminal (8-01) can determine whether to select or reselect other cells operating on the same frequency as the cell (8-07) according to step 7-60 of the above-described embodiment.

[0248] FIG. 9 is a diagram illustrating a procedure for a terminal in an RRC idle mode or RRC inactive state to reselect a cell for transmitting SIB1 on-demand in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0249] A given cell according to the present disclosure can periodically transmit essential system information including at least one of MIB and SIB1. The essential system information includes configuration information required for a terminal to select or camp on a cell. Additionally, a given cell according to the present disclosure has the characteristic of transmitting the MIB periodically, unlike the above-described embodiment (Fig. 5), but can transmit SIB1 in an on-demand manner. The on-demand manner refers to a method in which a base station broadcasts system information corresponding to a request from a terminal when there is a request from a terminal. This is because network energy saving (NES) can be achieved by transmitting SIB1 when there is a request from a terminal. Specifically, when a terminal needs to acquire SIB1 for a given reason (e.g., to select and / or reselect a cell), it may request broadcast / transmission of SIB1 to a cell that does not transmit SIB1, and accordingly, the cell may respond to the terminal whether to broadcast or not broadcast SIB1 (or the cell may respond to the terminal whether the terminal may select or reselect).

[0250] Referring to FIG. 9, the terminal (9-01) may be in RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) (9-10).

[0251] In step 9-15, a terminal (9-01) in RRC idle mode or RRC deactivation state can obtain essential system information from an NR cell (9-05). In various embodiments of the present disclosure, the essential system information may include at least one of MIB or SIB1.

[0252] In step 9-20, the terminal (9-01) performs a cell selection procedure based on the essential system information acquired in step 9-15 to find an NR suitable cell (9-05) and camp on that cell. This may follow the embodiment of FIG. 5 described above.

[0253] In step 9-25, the terminal (9-01) can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB) containing cell reselection information from the serving cell (9-05) to perform a cell reselection evaluation procedure. Additionally, the serving cell (9-05) can broadcast system information containing WUS configuration information. Step 9-25 can follow at least one of the embodiments of FIGS. 5, 6, 7, and 8 described above.

[0254] In step 9-30, the terminal (9-01) can determine a reselection priority for cell reselection. This can follow the embodiment of FIG. 5 described above.

[0255] In step 9-35, the cell (9-07) capable of transmitting SIB1 on-demand can transmit SSB, which is a synchronization signal, and MIB. For reference, the terminal (9-01) can obtain the MIB of the NR cell (9-07) in step 9-50 or step 9-45. For reference, the terminal (9-01) capable of requesting transmission of SIB1 can ignore the MIB broadcast by the NR cell (9-07) even if cellBarred is set to barred. That is, the terminal (9-01) can request transmission of SIB1 from the NR cell (9-07) and then determine whether to prohibit the NR cell (9-07) based on a response from the cell.

[0256] In step 9-40, the terminal (9-01) may perform frequency measurement for cell reselection. This may follow the embodiment of FIG. 5 described above.

[0257] In step 9-45, the terminal (9-01) can determine a candidate target cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 9-40. This can follow the aforementioned embodiment (Fig. 5). Accordingly, the terminal (9-01) according to the present disclosure can determine the final candidate target cell as the NR cell (9-07). That is, the NR cell (9-07) can be the best cell or the highest-ranked cell for the terminal (9-01).

[0258] At step 9-50, the terminal (9-01) can request broadcasting of SIB1 to the NR cell (9-07). That is, the NR cell does not periodically broadcast SIB1, so the terminal (9-01) can request broadcasting of SIB1 to the cell.

[0259] In step 9-55, the NR cell (9-07) may transmit a predetermined indicator or message (Msg2) in response to step 9-50 of the terminal (9-01). The NR cell (9-07) according to the present disclosure has a feature that it can transmit to the terminal (9-01) information that it does not transmit SIB1 or information that the terminal (9-01) cannot select or reselect the NR cell (9-07). For example, the NR cell (9-07) may transmit to the terminal (9-01) information indicating to the terminal (9-01) information that it does not transmit SIB1 or information that the terminal (9-01) cannot select or reselect the NR cell (9-07). To transmit the information, a new MAC (medium access control) CE (control element) or a MAC subheader with RAPID may be transmitted. The terminal (9-01) that receives this can perform at least one of the following operations on the cell.

[0260] ■ Action 1: The UE (9-01) may exclude the NR cell (9-07) as a candidate for cell selection or cell re-selection for up to a predetermined time (e.g., up to 300 seconds).

[0261] ■ Action 2: The UE (9-01) excludes the NR cell (9-07) as a candidate cell for cell selection or cell re-selection for a predetermined time (e.g., 300 seconds).

[0262] And, the terminal (9-01) can determine whether to select or reselect other cells operating on the same frequency as the cell (9-07) according to steps 7-60 of the above-described embodiment.

[0263] For convenience of explanation, FIGS. 6, 7, and 8 have been described separately above. However, it is also possible to perform the embodiments of FIGS. 6, 7, and 8 in combination within a consistent scope to obtain essential system information on demand. In addition, the series of procedures and operations related to messages, information, definitions, and cell reselection of FIG. 5 can be applied to the embodiments of FIGS. 6, 7, and 8.

[0264] FIG. 10 is a diagram showing the configuration of a terminal according to an embodiment of the present disclosure.

[0265] Referring to FIG. 10, the terminal includes an RF (Radio Frequency) processing unit (10-10), a baseband processing unit (10-20), a storage unit (10-30), and a control unit (10-40). The control unit (10-40) may further include a multi-connection processing unit (10-42).

[0266] The RF processing unit (10-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (10-10) up-converts the baseband signal provided from the baseband processing unit (10-20) 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 (10-10) 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 shown, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (10-10) may include multiple RF chains. Furthermore, the RF processing unit (10-10) may perform beamforming. For the above beamforming, the RF processing unit (10-10) 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.

[0267] The baseband processing unit (10-20) above 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 (10-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (10-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (10-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit (10-20) divides the baseband signal provided from the RF processing unit (10-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform), and then restores the received bit string through demodulation and decoding.

[0268] The baseband processing unit (10-20) and the RF processing unit (10-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (10-20) and the RF processing unit (10-10) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (10-20) and the RF processing unit (10-10) 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 (10-20) and the RF processing unit (10-10) 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.

[0269] The storage unit (10-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (10-30) can store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (10-30) provides the stored data at the request of the control unit (10-40).

[0270] The control unit (10-40) controls the overall operations of the terminal. For example, the control unit (10-40) transmits and receives signals through the baseband processing unit (10-20) and the RF processing unit (10-10). In addition, the control unit (10-40) records and reads data in the storage unit (10-30). For this purpose, the control unit (10-40) may include at least one processor. For example, the control unit (10-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0271] FIG. 11 is a diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0272] Referring to Fig. 11, the base station is configured to include an RF processing unit (11-10), a baseband processing unit (11-20), a backhaul communication unit (11-30), a storage unit (11-40), and a control unit (11-50). The control unit (11-50) may further include a multi-connection processing unit (11-52).

[0273] The RF processing unit (11-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (11-10) up-converts the baseband signal provided from the baseband processing unit (11-20) 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 (11-10) 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 (11-10) may include multiple RF chains. Furthermore, the RF processing unit (11-10) may perform beamforming. For the above beamforming, the RF processing unit (11-10) can adjust the phase and size 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.

[0274] The baseband processing unit (11-20) above 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 (11-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (11-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (11-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (11-20) 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 (11-20) divides the baseband signal provided from the RF processing unit (11-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operation, and then restores the received bit string through demodulation and decoding. The baseband processing unit (11-20) and the RF processing unit (11-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (11-20) and the RF processing unit (11-10) may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0275] The above backhaul communication unit (11-30) provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (11-30) converts a bit string transmitted from the main base station to other nodes, such as auxiliary base stations and core networks, into a physical signal, and converts a physical signal received from the other nodes into a bit string.

[0276] The storage unit (11-40) stores data such as basic programs, application programs, and setting information for the operation of the base station. In particular, the storage unit (11-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. In addition, the storage unit (11-40) 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 (11-40) provides the stored data at the request of the control unit (11-50).

[0277] The control unit (11-50) controls the overall operations of the base station. For example, the control unit (11-50) transmits and receives signals through the baseband processing unit (11-20) and the RF processing unit (11-10) or through the backhaul communication unit (11-30). In addition, the control unit (11-50) records and reads data in the storage unit (11-40). For this purpose, the control unit (11-50) may include at least one processor.

[0278] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0279] 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 disclosure.

[0280] These programs (software modules, software) may be stored in a non-volatile memory including random access memory, flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage devices, compact disc ROMs (CD-ROMs), digital versatile discs (DVDs) or other forms of optical storage devices, magnetic cassettes, or 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.

[0281] Additionally, the program may be stored on 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 disclosure 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 disclosure.

[0282] In the specific embodiments of the present disclosure described above, components included in the present disclosure are expressed singularly or plurally, 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 disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0283] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the respective embodiments may be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other modifications based on the technical idea of ​​the embodiments may also be implemented.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving system information including WUS (wake-up signal) configuration information from a serving cell; A step of checking whether the selected neighboring cell supports transmission of SIB 1 (system information block 1) in an on-demand manner based on cell reselection evaluation; If the adjacent cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, a step of transmitting a message requesting transmission of the SIB 1 in the on-demand manner to the adjacent cell; and A method characterized by comprising a step of receiving the SIB 1 from the adjacent cell.

2. In paragraph 1, The above WUS configuration information is provided by cell per frequency or by cell list per frequency.

3. In paragraph 1, A method in which a procedure for requesting transmission of SIB 1 is triggered if the NES cell is determined to be a candidate cell for cell reselection based on a synchronization signal block (SSB) measurement of at least one neighboring cell.

4. In paragraph 1, The above message corresponds to a random access preamble, A method wherein the above WUS configuration information includes configuration information for transmitting the random access preamble.

5. In paragraph 1, A method of camping on a neighboring cell when the neighboring cell is identified as a suitable cell based on the SIB 1 received from the neighboring cell.

6. In a method of a base station operating a first cell in a wireless communication system, A step of receiving a message requesting transmission of SIB 1 (system information block 1) in an on-demand manner from a terminal that is not being served by the first cell; and A step of transmitting the SIB 1 to the terminal based on the message, System information including WUS (wake-up signal) setting information for the terminal to transmit the message to the first cell is provided to the terminal from the second cell of the terminal, If the first cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, the message is transmitted to the first cell, A method in which the second cell corresponds to a serving cell of the terminal, and the first cell corresponds to an adjacent cell of the terminal.

7. In paragraph 5, The above WUS configuration information is provided per frequency cell or per frequency cell list, The above message corresponds to a random access preamble, A method wherein the above WUS configuration information includes configuration information for transmitting the random access preamble.

8. In paragraph 5, If the NES cell is determined to be a candidate cell for cell reselection based on the SSB (synchronization signal block) measurement of at least one neighboring cell, a procedure for requesting transmission of the SIB 1 is triggered, A method for the terminal to camp on the first cell when the first cell is identified as a suitable cell based on the SIB 1 received from the first cell.

9. In the terminal of a wireless communication system, Transmitter and receiver; and Receive system information including WUS (wake-up signal) configuration information from the serving cell, Based on the cell reselection evaluation, it is checked whether the selected neighboring cell supports transmission of SIB 1 (system information block 1) in an on-demand manner. If the adjacent cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, a message requesting transmission of the SIB 1 in the on-demand manner is transmitted to the adjacent cell, and A terminal comprising at least one processor controlling to receive the SIB 1 from the adjacent cell.

10. In paragraph 9, The above WUS configuration information is provided by terminal per cell of frequency or per cell list of frequencies.

11. In paragraph 9, A terminal that triggers a procedure for requesting transmission of SIB 1 if the NES cell is determined to be a candidate cell for cell reselection based on a synchronization signal block (SSB) measurement of at least one neighboring cell.

12. In paragraph 9, The above message corresponds to a random access preamble, The above WUS configuration information is a terminal including configuration information for transmitting the random access preamble.

13. In paragraph 9, A terminal that camps on a neighboring cell when the neighboring cell is identified as a suitable cell based on the SIB 1 received from the neighboring cell.

14. In a base station operating the first cell in a wireless communication system, Transmitter and receiver; and Receives a message requesting transmission of SIB 1 (system information block 1) in an on-demand manner from a terminal that is not being served by the first cell, and At least one processor configured to control transmission of the SIB 1 to the terminal based on the message, System information including WUS (wake-up signal) setting information for the terminal to transmit the message to the first cell is provided to the terminal from the second cell of the terminal, If the first cell is a network energy saving (NES) cell that supports transmission of the SIB 1 in the on-demand manner, the message is transmitted to the first cell, The second cell is a serving cell of the terminal, and the first cell is a base station corresponding to an adjacent cell of the terminal.

15. In paragraph 14, The above WUS configuration information is provided per frequency cell or per frequency cell list, The above message corresponds to a random access preamble, The above WUS configuration information includes configuration information for transmitting the random access preamble, If the NES cell is determined to be a candidate cell for cell reselection based on the SSB (synchronization signal block) measurement of at least one neighboring cell, a procedure for requesting transmission of the SIB 1 is triggered. A base station in which the terminal camps on the first cell when the first cell is identified as a suitable cell based on the SIB 1 received from the first cell.

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