Method and apparatus for receiving PEI of terminal having wake-up receiver in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. More specifically, according to various embodiments of the present disclosure, a method performed by a terminal in a wireless communication system may comprise the steps of: receiving, from a base station, a wake-up signal (WUS) indicating a first subgroup of a plurality of terminals; receiving, from the base station, a paging early indication (PEI) indicating a second subgroup of the plurality of terminals; and receiving paging from the base station if the terminal is included in the first subgroup and the second subgroup.

Description

Method and device for receiving PEI of a terminal having a wake-up receiver in a wireless communication system

[0001] The present disclosure relates to a method and device for a terminal having a wake-up receiver to receive a paging early indication (PEI) signal in a wireless communication system. More specifically, the present disclosure relates to a method and device for a terminal having a wake-up receiver to receive a PEI signal in order to resolve the problem of excessive terminal power consumption and achieve high energy efficiency in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in 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] As described above, as wireless communication systems develop, a method for signal transmission of terminals having wake-up receivers is required to solve the problem of excessive terminal power consumption and achieve high energy efficiency.

[0009] The present invention relates to a wireless communication system, and more specifically, to the operation of a terminal and a base station in a wireless communication system. According to various embodiments of the present disclosure, an apparatus and method capable of effectively providing services in a wireless communication system are provided.

[0010] According to various embodiments of the present disclosure, a method performed by a terminal in a wireless communication system may include the steps of: receiving, from a base station, a wake up signal (WUS) indicating a first subgroup of a plurality of terminals; receiving, from the base station, a paging early indication (PEI) indicating a second subgroup of the plurality of terminals when monitoring of the PEI is enabled; and receiving, from the base station, a paging early indication (PEI), wherein the terminal may be included in the first subgroup or the second subgroup.

[0011] The present disclosure provides a device and method capable of effectively providing a service in a wireless communication system.

[0012] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0013] FIG. 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system according to various embodiments of the present disclosure.

[0014] FIG. 2 illustrates a time domain mapping structure and beam sweeping operation of a synchronization signal according to various embodiments of the present disclosure.

[0015] FIG. 3 illustrates a signal flow for performing random access (RA) according to various embodiments of the present disclosure.

[0016] FIG. 4 illustrates a signal flow for a terminal to report terminal capability information to a base station according to various embodiments of the present disclosure.

[0017] FIG. 5 illustrates an example of state transitions between a base station and a terminal and a state of a terminal according to a base station state according to various embodiments of the present disclosure.

[0018] FIG. 6 illustrates an example of a method for distinguishing a group of terminals equipped with a wake-up receiver according to various embodiments of the present disclosure.

[0019] FIG. 7 illustrates another example of a method for distinguishing a group of terminals equipped with a wake-up receiver according to various embodiments of the present disclosure.

[0020] FIG. 8 illustrates an example of a method for receiving a paging early indication (PEI) of a terminal having a wake-up receiver according to various embodiments of the present disclosure.

[0021] FIG. 9 illustrates an operational flow of a terminal having a wake-up receiver for receiving PEI according to various embodiments of the present disclosure.

[0022] FIG. 10 illustrates an operation flow of a base station for transmitting PEI according to various embodiments of the present disclosure.

[0023] FIG. 11 illustrates a functional structure of a terminal according to various embodiments of the present disclosure.

[0024] FIG. 12 illustrates a functional structure of a base station according to various embodiments of the present disclosure.

[0025] Hereinafter, preferred embodiments of the present disclosure 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 disclosure will be omitted.

[0026] In describing the embodiments of this disclosure, descriptions of technical details that are well known in the technical field to which this disclosure pertains and are not directly related to this disclosure will be omitted. This is to ensure that the gist of this disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0027] 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.

[0028] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0029] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings 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 flowchart 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 flowchart 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).

[0030] 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.

[0031] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' 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 '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0032] In the following description of the present disclosure, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings.

[0033] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are provided as examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0034] In the following description, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, while PDSCH (physical downlink shared channel) refers to a physical channel through which data is transmitted, PDSCH can also be used to refer to data. That is, in the present disclosure, the expression "transmitting a physical channel" can be interpreted equivalently to the expression "transmitting data or a signal through a physical channel."

[0035] Hereinafter, in the present disclosure, upper signaling refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of the physical layer, or a terminal transmits a signal to a base station using an uplink data channel of the physical layer. Upper signaling can be understood as radio resource control (RRC) signaling or a media access control (MAC) control element (CE).

[0036] Furthermore, while this disclosure describes various embodiments using terminology used in certain communication standards (e.g., 3rd Generation Partnership Project (3GPP)), these are merely illustrative examples. The various embodiments of this disclosure can be easily modified and applied to other communication systems. Furthermore, the term "terminal" can refer to not only cell phones, smartphones, IoT devices, and sensors, but also other wireless communication devices.

[0037] Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, an eNB, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Of course, the present invention is not limited to the above examples. In addition, although various embodiments of the present invention are described below using a system based on LTE, LTE-A, or NR as an example, various embodiments of the present invention may be applied to other communication systems having a similar technical background or channel type. In addition, various embodiments of the present invention may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope thereof at the discretion of a person having skilled technical knowledge.

[0038] To handle the explosive growth in mobile data traffic, the initial standards for the 5G (5th Generation) system, or New Radio access technology NR), the next-generation communication system following LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution), have been completed. While existing mobile communication systems have focused on conventional voice / data communications, the 5G system aims to satisfy various services and requirements, such as enhanced Mobile Broadband (eMBB) services for improving existing voice / data communications, Ultra-Reliable and Low Latency Communication (URLLC) services for high reliability / ultra-low latency communications, and massive Machine Type Communication (MTC) services for supporting large-scale machine-to-machine communications.

[0039] While the transmission bandwidth of existing LTE and LTE-A systems per single carrier is limited to a maximum of 20 MHz, the 5G system aims to utilize a much wider ultra-wide bandwidth to provide ultra-high-speed data services of up to several Gbps. Accordingly, the 5G system is considering ultra-high frequency bands ranging from several GHz up to 100 GHz as candidate frequencies, where securing ultra-wide bandwidth frequencies is relatively easy. Additionally, wide bandwidth frequencies for the 5G system can be secured through frequency reallocation or allocation within frequency bands ranging from several hundred MHz to several GHz used in existing mobile communication systems.

[0040] Ultra-high frequency radio waves, sometimes called millimeter waves (mmWave), have wavelengths on the order of millimeters. However, in ultra-high frequency bands, path loss increases proportionally to the frequency band, reducing the coverage of mobile communication systems.

[0041] To overcome the drawback of reduced coverage in ultra-high frequency bands, beamforming technology is applied. This technology focuses the radiated energy of radio waves toward a predetermined target point using multiple antennas, thereby increasing the transmission range. Specifically, a signal using beamforming technology has a relatively narrow beam width, and the radiated energy is concentrated within this narrowed beam width, increasing the transmission range. Beamforming technology can be applied to both the transmitter and receiver. In addition to increasing coverage, beamforming technology also reduces interference in areas outside the beamforming direction. For beamforming technology to function properly, accurate measurement and feedback of the transmission and reception beams are required. Beamforming technology can be applied to control channels or data channels that correspond one-to-one between a given terminal and a base station. Furthermore, beamforming can also be applied to common signals transmitted by a base station to multiple terminals within a system, such as synchronization signals, physical broadcast channels (PBCHs), and control and data channels for transmitting system information, to increase coverage. When applying beamforming technology to a common signal, beam sweeping technology, which transmits a signal by changing the beam direction, is additionally applied so that the common signal can reach terminals located at any location within the cell.

[0042] Another requirement for 5G systems is ultra-low latency services, with transmission delays of approximately 1 ms between transmitters and receivers. One way to reduce transmission delay is to design a frame structure based on a short TTI (transmission time interval) compared to LTE and LTE-A. A TTI is the basic time unit for scheduling, and the TTI of existing LTE and LTE-A systems is 1 ms, which corresponds to the length of one subframe. For example, to meet the requirements for ultra-low latency services in 5G systems, possible short TTIs include 0.5 ms, 0.25 ms, and 0.125 ms, which are shorter than those of existing LTE and LTE-A systems.

[0043] FIG. 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system according to various embodiments of the present disclosure. More specifically, FIG. 1 is a diagram illustrating the basic structure of a time-frequency resource domain, which is a wireless resource domain in which data or control channels of a 5G system are transmitted.

[0044] Referring to Figure 1, the horizontal axis in Figure 1 represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain of a wireless communication system is an OFDM (Orthogonal Frequency Division Multiplexing) symbol. The dog symbols (102) come together to form one slot (106), A plurality of slots can be combined to form a subframe (105). The length of the subframe is 1.0 ms, and 10 subframes can be combined to form a 10 ms frame (114). The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is a total of N BW It can be composed of (104) subcarriers.

[0045] The basic unit of resources in the time-frequency domain is a Resource Element (RE) (112), which can be represented by an OFDM symbol index and a subcarrier index. A Resource Block (RB or Physical Resource Block, PRB) is a resource block in the frequency domain. can be defined as a series of consecutive subcarriers (110). In the 5G system =12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0046] In wireless communication systems, a base station can map data in RB units and perform scheduling on RBs, which typically constitute a slot for a given terminal. That is, in a 5G system, the basic time unit for scheduling may be a slot, and the basic frequency unit for scheduling may be an RB.

[0047] Number of OFDM symbols It is determined by the length of the cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, if the normal CP is applied, =14, when Extended CP is applied =12. Extended CP is applied to systems with relatively long transmission distances compared to regular CP, allowing for maintaining orthogonality between symbols. In the case of regular CP, the ratio of CP length to symbol length is maintained at a constant value, so the overhead due to CP can be maintained constant regardless of the subcarrier spacing. That is, if the subcarrier spacing is small, the symbol length becomes longer, and thus the CP length can also become longer. Conversely, if the subcarrier spacing is large, the symbol length becomes shorter, and thus the CP length can be reduced. The symbol length and CP length can be inversely proportional to the subcarrier spacing.

[0048] In wireless communication systems, various frame structures can be supported by adjusting the subcarrier spacing to satisfy various services and requirements. For example, from the perspective of operating frequency band, a larger subcarrier spacing is advantageous for recovering phase noise in high-frequency bands. From the perspective of transmission time, a larger subcarrier spacing shortens the symbol length in the time domain, which in turn shortens the slot length, making it advantageous for supporting ultra-low-latency services such as URLLC (ultra-reliable low-latency communications). From the perspective of cell size, a longer CP length allows for larger cells, so a smaller subcarrier spacing allows for relatively larger cells. In mobile communications, a cell is a concept referring to the area covered by a single base station.

[0049] Subcarrier spacing (SCS), CP length, etc. are essential information for OFDM transmission and reception. For smooth transmission and reception, the base station and terminal must recognize the subcarrier spacing, CP length, etc. as common values.

[0050] [Table 1] below shows the subcarrier spacing configuration (μ) and subcarrier spacing ( ), which represents the relationship between CP length.

[0051]

[0052] [Table 2] below shows the number of symbols per slot for each subcarrier spacing setting (μ) for the general CP. ), number of slots per frame ( ), number of slots per subframe ( ) is indicated.

[0053]

[0054] [Table 3] below shows the number of symbols per slot (μ) for each subcarrier spacing setting for extended CP. ), number of slots per frame ( ), number of slots per subframe ( ) is indicated.

[0055] μ 212404

[0056] In the early days of 5G systems, coexistence or dual-mode operation with existing LTE and / or LTE-A (hereinafter referred to as LTE / LTE-A) systems was anticipated. This would allow existing LTE / LTE-A systems to provide stable system operation to terminals, while the 5G system could provide enhanced services to terminals. Therefore, the 5G system's frame structure must at least include the LTE / LTE-A frame structure or essential parameter set (e.g., subcarrier spacing = 15 kHz).

[0057] For example, comparing a frame structure with a subcarrier spacing setting μ=0 (hereinafter referred to as frame structure A) and a frame structure with a subcarrier spacing setting μ=1 (hereinafter referred to as frame structure B), compared to frame structure A, frame structure B shows that the subcarrier spacing and RB size are twice as large, and the slot length and symbol length are twice as small. In the case of frame structure B, two slots can constitute one subframe, and 20 subframes can constitute one frame.

[0058] Generalizing the frame structure of a 5G system provides high scalability by ensuring that essential parameters—subcarrier spacing, CP length, and slot length—have integer multiple relationships for each frame structure. A fixed-length subframe of 1 ms can be defined to represent a reference time unit independent of the frame structure.

[0059] The frame structure can be applied to various scenarios. From the perspective of cell size, the longer the CP length, the larger the cell can be supported, so frame structure A can support relatively larger cells than frame structure B. From the perspective of operating frequency band, the larger the subcarrier spacing, the more advantageous it is for recovering phase noise in the high-frequency band, so frame structure B can support relatively higher operating frequencies than frame structure A. From the perspective of service, the shorter the slot length, which is the basic time unit of scheduling, the more advantageous it is for supporting ultra-low-latency services such as URLLC, so frame structure B can be relatively more suitable for URLLC services than frame structure A.

[0060] In the following description of the present disclosure, uplink (UL) may refer to a wireless link through which a terminal transmits data or a control signal to a base station, and downlink (DL) may refer to a wireless link through which a base station transmits data or a control signal to a terminal.

[0061] In the initial access phase, when a terminal first accesses the system, the terminal can synchronize downlink time and frequency from a synchronization signal transmitted by a base station through cell search, and obtain a cell identifier (cell ID). The terminal can use the obtained cell ID to receive a Physical Broadcast Channel (PBCH) and obtain a Master Information Block (MIB), which is essential system information, from the PBCH. Additionally, the terminal can obtain cell-common transmission and reception-related control information by receiving system information (System Information Block (SIB)) transmitted by the base station. The cell-common transmission and reception-related control information may include random access (RA)-related control information, paging-related control information, and common control information for various physical channels.

[0062] The synchronization signal serves as a reference for cell search, and the subcarrier spacing can be applied to suit channel conditions such as phase noise for each frequency band. In the case of data channels or control channels, the subcarrier spacing can be adaptively applied depending on the service type to support various services as described above.

[0063] FIG. 2 illustrates a time domain mapping structure and beam sweeping operation of a synchronization signal according to various embodiments of the present disclosure.

[0064] Hereinafter, the following components may be predefined for the purpose of explaining the present disclosure.

[0065] - PSS (Primary Synchronization Signal): A signal that serves as the basis for DL ​​time / frequency synchronization and can provide some cell ID information.

[0066] - SSS (Secondary Synchronization Signal): This serves as a reference for DL ​​time / frequency synchronization and can provide some remaining information, including the cell ID. Additionally, it can serve as a reference signal for PBCH demodulation.

[0067] - PBCH (Physical Broadcast Channel): It can provide MIB (Master Information Block), which is essential system information required for transmission and reception of data channels and control channels of the terminal. Essential system information can include control information related to the search space indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel that transmits system information, and SFN (System Frame Number), which is a frame unit index that serves as a timing reference, etc.

[0068] - SS / PBCH Block (Synchronization Signal / PBCH Block or SSB): An SS / PBCH block can be composed of N OFDM symbols and can include a combination of PSS, SSS, PBCH, etc. In a system where beam sweeping technology is applied, an SS / PBCH block can be the minimum unit to which beam sweeping is applied. In a 5G system, N can be 4. The base station can transmit up to L SS / PBCH blocks, and the L SS / PBCH blocks can be mapped within a half frame (0.5 ms). The L SS / PBCH blocks can be periodically repeated in units of a predetermined period, P. The period P can be notified to the terminal through signaling by the base station. If there is no separate signaling for the period P, the terminal can apply a pre-agreed default value.

[0069] FIG. 2 illustrates an example in which beam sweeping is applied to SS / PBCH block units over time. In the example of FIG. 2, terminal 1 (205) can receive an SS / PBCH block using a beam radiated in the direction of #d0 (203) by beamforming applied to SS / PBCH block #0 at time t1 (201). Terminal 2 (206) can receive an SS / PBCH block using a beam radiated in the direction of #d4 (204) by beamforming applied to SS / PBCH block #4 at time t2 (202). The terminal can obtain an optimal synchronization signal through a beam radiated from the base station in the direction where the terminal is located. For example, terminal 1 (205) may have difficulty in obtaining time / frequency synchronization and essential system information from an SS / PBCH block through a beam radiated in the direction of #d4, which is far from the location of terminal 1.

[0070] In addition to the initial connection procedure, the terminal may receive SS / PBCH blocks to determine whether the radio link quality of the current cell is maintained at a certain level. Furthermore, during a handover procedure, in which the terminal moves from the current cell to a neighboring cell, the terminal may receive SS / PBCH blocks from the neighboring cell to determine the radio link quality of the neighboring cell and obtain time / frequency synchronization with the neighboring cell.

[0071] After the terminal acquires MIB and system information from the base station through the initial access procedure, the terminal can perform a random access procedure to transition the link with the base station to the connected state (or RRC_CONNECTED state). Upon completion of the random access procedure, the terminal transitions to the connected state (or RRC_CONNECTED state), enabling one-to-one communication between the base station and the terminal. The random access procedure is described in detail below with reference to FIG. 3.

[0072] FIG. 3 illustrates a signal flow for performing random access (RA) according to various embodiments of the present disclosure.

[0073] Referring to FIG. 3, in step 310, a terminal may transmit a random access preamble to a base station. The random access preamble, which is the first transmission message of the terminal in the random access procedure, may be referred to as message 1. The base station may measure a transmission delay value between the terminal and the base station from the random access preamble and synchronize uplink. At this time, the terminal may arbitrarily select which random access preamble to use within a random access preamble set given in advance by system information. The initial transmission power of the random access preamble may be determined according to the path loss measured by the terminal between the base station and the terminal. In addition, the terminal may determine the transmission beam direction of the random access preamble from the synchronization signal received from the base station and transmit the random access preamble.

[0074] In step 320, the base station may transmit a Random Access Response (RAR) (or message 2) in response to the random access preamble received in step 310. The base station may transmit an uplink transmission timing adjustment command to the terminal based on a transmission delay value measured from the random access preamble. The base station may transmit to the terminal an uplink resource to be used by the terminal and a power control command as scheduling information. The scheduling information transmitted by the base station may include control information for the uplink transmission beam of the terminal.

[0075] In one embodiment, if the terminal does not receive the Random Access Response (RAR) (or message 2), which is scheduling information for message 3, from the base station within a predetermined time in step 320, the base station or the terminal may proceed to step 310 again. If proceeding to step 310 again, the terminal may increase the transmission power of the random access preamble by a predetermined step (e.g., power ramping) and transmit it, thereby increasing the probability of the base station receiving the random access preamble.

[0076] In step 330, the terminal may transmit uplink data including a terminal ID (e.g., message 3) to the base station using the uplink resources allocated in step 320. According to one embodiment, the terminal may transmit the uplink data including the terminal ID to the base station through an uplink data channel (Physical Uplink Shared Channel, PUSCH). According to one embodiment, the transmission timing of the uplink data channel for transmitting Message 3 may follow a timing control command received from the base station in step 320. According to one embodiment, the transmission power of the uplink data channel for transmitting Message 3 may be determined in consideration of the power control command received from the base station in step 320 and a power ramping value of the random access preamble. According to one embodiment, the uplink data channel for transmitting Message 3 may mean a first uplink data signal that the terminal transmits to the base station after transmitting the random access preamble.

[0077] In step 340, if the base station determines that the terminal has performed random access without collision with other terminals, the base station may transmit data (e.g., message 4) including the ID of the terminal that transmitted uplink data in step 330 to the terminal. According to one embodiment, the terminal may determine that the random access is successful if it receives the signal transmitted by the base station in step 340 from the base station. According to one embodiment, the terminal may transmit HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement) information indicating whether message 4 was successfully received to the base station through an uplink control channel (Physical Uplink Control Channel, PUCCH).

[0078] In one embodiment, if the data transmitted by the terminal in step 330 collides with data from another terminal, causing the base station to fail to receive a data signal from the terminal, the base station may not transmit any more data to the terminal. In one embodiment, if the terminal fails to receive the data transmitted from the base station in step 340 within a certain period of time, it may determine that the random access procedure has failed and may proceed again from step 310.

[0079] According to one embodiment, when a terminal successfully completes a random access procedure, the terminal may transition to a connected state (or RRC_CONNECTED state), and one-to-one communication may be enabled between the base station and the terminal. According to one embodiment, the base station may receive terminal capability (UE) information from the terminal in the connected state (or RRC_CONNECTED state) and adjust scheduling by referring to the terminal capability information of the corresponding terminal. According to one embodiment, the terminal may inform the base station through the terminal capability information whether the terminal itself supports a certain function, the maximum allowable value of the function supported by the terminal, etc. Accordingly, the terminal capability (UE capability) information reported by each terminal to the base station may have different values ​​for each terminal.

[0080] For example, a terminal may report terminal capability information including at least one of the following control information to a base station.

[0081] - Control information related to frequency bands supported by the terminal

[0082] - Control information related to channel bandwidth supported by the terminal

[0083] - Control information related to the maximum modulation method supported by the terminal

[0084] - Control information related to the maximum number of beams supported by the terminal

[0085] - Control information related to the maximum number of layers supported by the terminal

[0086] - Control information related to CSI reporting supported by the terminal

[0087] - Control information on whether the terminal supports frequency hopping

[0088] - Bandwidth-related control information when supporting carrier aggregation (CA).

[0089] - Control information on whether cross carrier scheduling is supported when carrier aggregation is supported.

[0090] FIG. 4 illustrates a signal flow for a terminal to report terminal capability information to a base station according to various embodiments of the present disclosure.

[0091] Referring to FIG. 4, at step 410, the base station (402) can transmit a terminal capability information request message to the terminal (401).

[0092] At step 420, based on the request for terminal capability information from the base station (402), the terminal (401) may transmit terminal capability information to the base station. In one embodiment, the terminal (401) may also transmit terminal capability information to the base station (402) regardless of the request for terminal capability information from the base station (402).

[0093] According to various embodiments of the present disclosure, based on the process of transmitting and receiving terminal capability information, a terminal connected to a base station can communicate one-to-one with the base station as a terminal in an RRC_CONNECTED state.

[0094] According to one embodiment, a terminal that is not connected may be in an RRC_IDLE state, and a terminal in an RRC_IDLE state may perform the following process.

[0095] - Performs terminal-specific DRX (Discontinuous Reception) cycles set by the upper layer.

[0096] - Receive paging messages from the core network

[0097] - Obtain system information

[0098] - Measurement behavior related to serving cell (or camping cell) and cell selection / reselection

[0099] - Measurement operations related to surrounding cells and cell reselection

[0100] - Receiving PEI (Paging Early Indication)

[0101] In one embodiment, more specifically with respect to measurement operations related to a serving cell (or a camped cell) and cell selection / reselection, the UE may measure SS (synchronization signal)-RSRP (reference signal received power) and SS-RSRQ (reference signal received quality) levels for the serving cell (or the camped cell) at least every M1*N1 DRX cycle. The UE may evaluate a cell selection decision criterion S based on the measured values. Here, when the SMTC (SSB-based Measurement Timing Configuration) cycle is greater than 20ms and the DRX cycle is less than or equal to 0.64s, M1 may be 2, and in other cases, M1 may be 1.

[0102] Additionally, N1 can be determined by Table 4 below.

[0103]

[0104] The cell selection criterion S is S corresponding to SS-RSRP rxlev >0, and S corresponding to SS-RSRQ qual It can be satisfied when >0.

[0105] In one embodiment, S rxlev and S qual can be expressed as follows.

[0106] S rxlev =Q rxlevmeas- (Q rxlevmin +Q rxlevminoffset )-P compensation -Q offsettemp

[0107] S qual =Q qualmeas- (Q qualmin +Q qualminoffset )-Q offsettemp

[0108] Here, Q rxlevmeas is the measured SS-RSRP, and Q qualmeas may be the measured SS-RSRQ. According to one embodiment, Q rxlevmin may be the minimum required reception signal level in the serving cell, and can be received by the terminal as system information. Q qualmin may be a quality level of a received signal required at a minimum limit in a serving cell, and may be received by the terminal as system information. The remaining parameters may be substantially the same as the parameters presented in 3gpp TS 38.304. The terminal may determine the SS-RSRP of the serving cell by performing filtering based on at least two measurement values ​​that are spaced apart by at least half a DRX cycle in determining the measured SS-RSRP. In addition, the terminal may determine the SS-RSRQ of the serving cell by performing filtering based on at least two measurement values ​​that are spaced apart by at least half a DRX cycle in determining the measured SS-RSRQ.

[0109] If the terminal is N servDuring consecutive DRX cycles, if it is determined that the serving cell does not satisfy the cell selection criterion S, the UE may initiate measurements of all surrounding cells other than the serving cell. If the UE fails to find a new suitable cell for 10 s, it may initiate a cell selection procedure for the selected Public Land Mobile Network (PLMN).

[0110] Hereinafter, a more specific description will be given with respect to a terminal receiving a paging message from a core network. According to one embodiment, a terminal may monitor one paging occasion (PO) (e.g., a paging location) during a DRX cycle. A PO may be a set of PDCCH monitoring occasions and may include multiple time slots (or subframes, or OFDM symbols) in which paging control information may be transmitted and received. A paging frame (PF) may be one radio frame (e.g., 10 ms) and may include one or multiple POs or starting points (e.g., offsets) of POs.

[0111] In one embodiment, PF and PO can be determined by the following formulas:

[0112] The SFN (System Frame Number) for PF can be determined by (SFN + PF_offset) mod T = (T div N)*(UE_ID mod N), where PF_offset is an offset for PF determination, T is a DRX cycle, N is the number of PFs per DRX cycle (e.g., cell common, cell specific), which can be determined by higher-level signals such as system information, and UE_ID is a terminal ID (e.g., 5G-S-TMSI), which can be determined by the core network.

[0113] According to one embodiment, the PFs determined by N may mean paging frames commonly applied to terminals within a cell, and may be referred to as cell common PFs for convenience hereinafter.

[0114] In one embodiment, i_s indicating the PO index may be determined by i_s = floor (UE_ID / N) mod Ns, where Ns may mean the number of POs in one PF and may be determined by a higher-order signal such as system information.

[0115] For example, if PF_offset=3, T=128, N=T / 4=32, Ns=4, and UE_ID mod 32 is 1, and floor (UE_ID / 32) mod 4 is 1, then the values ​​of the parameters can be determined by the following formula.

[0116] (SFN + 3) mod 128 = (128 div 32)*(UE_ID mod 32) = 4*1 = 4,

[0117] i_s = floor (UE_ID / 32) mod 4 = 1

[0118] Accordingly, the PF, which is a paging frame that a terminal with the above UE_ID must receive, can be determined as a radio frame with SFN of 1, 129, 257, ... among the common PFs of the cell, and the PO can be determined as the (i_s + 1)th PO among the four POs in the PF.

[0119] Hereinafter, the reception of Paging Early Indication (PEI) will be described in more detail. According to one embodiment, the terminal may receive PEI to reduce terminal power consumed while monitoring and receiving a paging control channel and a paging data channel in each DRX cycle. According to one embodiment, the PEI may include a bit field for indicating multiple paging occupancies per PEI and multiple subgroups per paging occupancies. The subgroup of a terminal supporting PEI may be designated by the Core Network (CN) via non-access stratum (NAS) signaling (e.g., by an access and mobility management function (AMF) entity), or may be determined based on parameters and a terminal ID by system information. The terminal may receive the PEI and determine whether the subgroup to which the terminal belongs is indicated as '1' in the paging occupancies that the terminal should receive, and if the subgroup is indicated as '1', the terminal may receive paging information in the paging occupancies. If the subgroup is indicated as '0', the terminal may skip receiving paging information.

[0120] According to one embodiment, when a set of Tracking Reference Signal (TRS) OKs is provided to a terminal in RRC_IDLE or RRC_INACTIVE state by system information trs-ResourceSetConfig, a DCI format 1_0 having a CRC scrambled by PEI (e.g., DCI format 2_7) and P-RNTI may include a TRS availability indication field. The terminal may determine whether a set of TRS resources can be received in a cell from the TRS availability indication field, and may perform time / frequency synchronization, automatic gain control (AGC), channel estimation, etc. by receiving the set of TRS resources.

[0121] According to various embodiments of the present disclosure, a terminal may monitor or receive one PEI Occasion (PEI-O) before receiving paging during a DRX cycle. When the terminal receives a PEI and the PEI indicates a subgroup to which the terminal belongs and a paging okay, the terminal belonging to the subgroup may monitor the associated paging okay (PO). If the terminal does not detect the PEI in the PEI okay or the PEI does not indicate a subgroup to which the terminal belongs and a paging okay, the terminal does not need to monitor the associated paging okay (PO), thereby reducing terminal power consumption.

[0122] In one embodiment, the terminal may determine PEI occupancy as follows. The PEI occupancy may be located behind the radio frame of the reference point, which is located ahead of the PF containing the associated PO by pei-FrameOffset, by a subframe offset. The terminal may monitor the PEI in the PEI occupancy determined by the above method. Here, pei-FrameOffset, the subframe offset, etc. may be determined by a higher-order signal such as system information.

[0123] According to various embodiments of the present disclosure, a new terminal state called RRC_INACTIVE has been defined in a 5G system to reduce the energy and time consumed by a terminal for initial access. In addition to the operations performed by an RRC_IDLE terminal, an RRC_INACTIVE terminal can perform the following processes.

[0124] - Storage of AS (Access stratum) information required for cell connection

[0125] - Terminal-specific DRX cycle operation set by the RRC layer

[0126] - Setting up and periodically updating RNA (RAN (radio access network)-based notification area) that can be utilized during handover by the RRC layer

[0127] - Monitoring of RAN-based paging messages transmitted via I-RNTI (inactive-radio network temporary identifier)

[0128] According to one embodiment, a terminal in an RRC_CONNECTED state may change from an RRC_CONNECTED state to an RRC_INACTIVE or RRC_IDLE state by receiving an RRC Release instruction from a base station.

[0129] According to one embodiment, a terminal in RRC_INACITVE, RRC_IDLE state may change from RRC_INACTIVE, RRC_IDLE to RRC_CONNECTED state by performing random access and completing all random access procedures.

[0130] According to various embodiments of the present disclosure, a scheduling method for a base station to transmit downlink data to a terminal or instruct the terminal to transmit uplink data is described below.

[0131] According to one embodiment, downlink control information (DCI) may be control information transmitted by a base station to a terminal via the downlink. The downlink control information may include downlink data scheduling information or uplink data scheduling information for a given terminal. Typically, the base station independently performs channel coding on the DCI for each terminal and then transmits it to each terminal via a downlink physical control channel, the PDCCH (Physical Downlink Control Channel).

[0132] According to one embodiment, the base station may operate by applying a DCI format determined for a purpose, such as whether it is scheduling information for downlink data (downlink assignment), scheduling information for uplink data (uplink grant), or DCI for power control, for a terminal to be scheduled.

[0133] According to one embodiment, a base station may transmit downlink data to a terminal via a Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. The base station may inform the terminal of scheduling information, such as a specific mapping location in the time and frequency domains of the PDSCH, a modulation scheme, HARQ-related control information, and power control information, through DCI related to downlink data scheduling information among the DCIs transmitted via the PDCCH.

[0134] According to one embodiment, a terminal may transmit uplink data to a base station via a Physical Uplink Shared Channel (PUSCH), a physical channel for uplink data transmission. The base station may inform the terminal of scheduling information, such as a specific mapping location in the time and frequency domains of the PUSCH, a modulation scheme, HARQ-related control information, and power control information, through DCI related to uplink data scheduling information among the DCI transmitted via the PDCCH.

[0135] According to one embodiment, the time-frequency resources to which the PDCCH is mapped may be referred to as a Control Resource Set (CORESET). A CORESET may be configured for all or part of the frequency resources of the bandwidth supported by the terminal in the frequency domain. In the time domain, it may be configured with one or more OFDM symbols, which may be defined as the CORESET length (Control Resource Set Duration). The base station may configure one or more CORESETs to the terminal through higher layer signals (e.g., System Information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). When the base station configures a CORESET to the terminal, this may mean that the base station provides the terminal with information such as a CORESET identifier (Identity), the frequency location of the CORESET, and the symbol length of the CORESET. The information that the base station provides to the terminal to configure the CORESET may include at least some of the information included in [Table 5] below.

[0136]

[0137] In one embodiment, CORESET operates in the frequency domain. It can be composed of RBs and in the time domain ∈{1,2,3} symbols. The NR PDCCH may be composed of one or more Control Channel Elements (CCEs). One CCE may be composed of six Resource Element Groups (REGs), and a REG may be defined as one RB during one OFDM symbol. Within one CORESET, REGs may be indexed in time-first order, starting with REG index 0 from the first OFDM symbol of the CORESET, the lowest RB.

[0138] According to one embodiment, interleaved and non-interleaved transmission methods for PDCCH may be supported. The base station may configure whether interleaved or non-interleaved transmission is to be performed for each CORESET to the terminal through upper layer signaling. Interleaving may be performed in units of REG bundles. A REG bundle may be defined as a set of one or more REGs. The terminal may determine the CCE-to-REG mapping method in the corresponding CORESET based on whether interleaved or non-interleaved transmission is configured by the base station, as shown in [Table 6] below.

[0139]

[0140] According to one embodiment, the base station may inform the terminal of configuration information such as information about the symbol to which the PDCCH is mapped within a slot and the transmission period.

[0141] According to one embodiment, the search space of the PDCCH is described as follows. The number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs can be used for link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel can be transmitted through L CCEs. A terminal can perform blind decoding to detect a signal without knowing information about the downlink control channel, and for this purpose, a search space representing a set of CCEs can be defined. A search space is a set of downlink control channel candidates (CCEs) that a terminal must attempt to decode at a given aggregation level. Since there are multiple aggregation levels that create a single bundle of 1, 2, 4, 8, or 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0142] In one embodiment, the search space may be classified into a common search space (CSS) and a UE-specific search space (USS). A certain group of UEs or all UEs may search the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling for the System Information Block (SIB) or paging messages. For example, a UE may receive scheduling allocation information for the PDSCH for receiving system information by searching the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs or all UEs must receive the PDCCH, it may be defined as a set of pre-arranged CCEs. UE-specific scheduling allocation information for the PDSCH or PUSCH may be received by the UE by searching the UE-specific search space of the PDCCH. The UE-specific search space may be defined UE-specifically as a function of the UE's identity (ID) and various system parameters.

[0143] According to one embodiment, the base station can set configuration information for the search space of the PDCCH to the terminal through a higher layer signal (e.g., SIB, MIB, RRC signaling). For example, the base station can set the number of PDCCH candidates in each aggregation level L, the monitoring period for the search space, the monitoring occupancy in units of symbols within a slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the CORESET index to be monitored in the search space, etc. to the terminal.

[0144] For example, parameters for the search space for PDCCH may include information such as [Table 7] below.

[0145]

[0146]

[0147] According to one embodiment, based on the configuration information transmitted to the terminal, the base station may configure one or more search space sets for the terminal. According to one embodiment, the base station may configure search space set 1 and search space set 2 for the terminal. In search space set 1, the terminal may be configured to monitor DCI format A scrambled with X-RNTI in a common search space, and in search space set 2, the terminal may be configured to monitor DCI format B scrambled with Y-RNTI in a terminal-specific search space.

[0148] In one embodiment, according to the configuration information transmitted by the base station, one or more search space sets may exist in the common search space or the terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as the common search space, and search space set #3 and search space set #4 may be configured as the terminal-specific search space.

[0149] According to one embodiment, a terminal may monitor the following combination of DCI format and RNTI in a common search space. Various embodiments of the present disclosure, of course, are not limited to the examples below.

[0150] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0151] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0152] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0153] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0154] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0155] According to one embodiment, in a terminal-specific search space, a terminal may monitor the following combination of DCI format and RNTI. Various embodiments of the present disclosure, of course, are not limited to the examples below.

[0156] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0157] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0158] According to one embodiment, RNTIs may follow the following definitions and usages. According to various embodiments of the present disclosure, of course, they are not limited to the examples below.

[0159] - C-RNTI (Cell RNTI): For terminal-specific PDSCH or PUSCH scheduling purposes.

[0160] - TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0161] - CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0162] - RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0163] - P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0164] - SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0165] - INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0166] - TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0167] - TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0168] - TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0169] According to one embodiment, the DCI formats described above may follow the definitions shown in [Table 8] below.

[0170]

[0171] According to one embodiment, the search space of aggregation level L in CORESET p, a search space set s, can be expressed as the following mathematical formula.

[0172]

[0173] - L: Integration level

[0174] - nCI: Carrier Index

[0175] - NCCE,p: Total number of CCEs within the control resource set p

[0176] - nμs,f: slot index

[0177] - M(L)p,s,max: Number of PDCCH candidates for aggregation level L

[0178] - msnCI = 0,..., M(L)p,s,max -1: PDCCH candidate index of aggregation level L

[0179] - i = 0,..., L-1

[0180] - , A0=39827, A1=39829, A2=39839, D=65537

[0181] - nRNTI: Terminal identifier

[0182] Here, The value can be 0 for a common search space.

[0183] Here, In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's ID (e.g., C-RNTI or ID set to the terminal by the base station) and a time index.

[0184] As described above, to achieve ultra-high-speed data services reaching several Gbps in 5G systems, ultra-wide bandwidth signal transmission and reception of tens to hundreds of MHz or even several GHz can be supported. Ultra-wide bandwidth signal transmission and reception can be supported through a single component carrier (CC) or through carrier aggregation (CA) technology that combines multiple component carriers. When a mobile communication service provider cannot secure a frequency with sufficient bandwidth for ultra-high-speed data services through a single component carrier, CA technology can increase the total frequency bandwidth by combining individual component carriers with relatively small bandwidths, thereby enabling ultra-high-speed data services.

[0185] 5G systems are designed and developed for a wide range of use cases. In addition to standby time, reliability, and availability, energy efficiency of devices is crucial in 5G systems. 5G devices require weekly or daily charging, depending on individual usage. For example, devices typically consume tens of mW in RRC_IDLE / RRC_INACTIVE states and hundreds of mW in RRC_CONNECTED states. Designing for extended battery life can be essential not only for a better user experience but also for improving energy efficiency. Energy efficiency can be even more critical for devices without a continuous energy source (e.g., devices using small rechargeable or single coin cell batteries). Sensors and actuators are widely deployed in 5G use cases for monitoring, measurement, and charging. Typically, these devices require batteries that are non-rechargeable and can last for at least several years. Wearables, including smartwatches, rings, eHealth devices, and medical monitoring devices, typically struggle to last more than one to two weeks, depending on usage.

[0186] In one embodiment, the power consumption of a 5G terminal depends on the set length of wake-up periods (e.g., paging cycles), and a large extended discontinuous reception (eDRX) cycle may be used to meet battery life requirements. However, the eDRX approach relies on high latency to maintain long battery life, making it unsuitable for low-latency services. For example, in a fire detection and extinguishing use case, fire shutters may need to be closed and sprinklers turned on by actuators within 1-2 seconds of a fire being detected by a sensor. In this case, latency may be critical, and a long eDRX cycle, as in the past, is not suitable because it cannot meet the latency requirements.

[0187] FIG. 5 illustrates an example of state transitions between a base station and a terminal, and the state of a terminal according to the base station state, according to various embodiments of the present disclosure. Specifically, FIG. 5 illustrates state transitions between a base station and a terminal to address the aforementioned issues.

[0188] In one embodiment, a 5G terminal may require a periodic wake-up once per eDRX cycle, which may dominate power consumption during periods of no signaling or data traffic. If the terminal could wake up only when triggered, such as by paging, power consumption could be drastically reduced. This drastic power reduction can be achieved by triggering the main radio (e.g., a legacy NR radio) using a wake-up signal (WUS), as shown in FIG. 5, and using a separate receiver, a wake-up receiver (WUR), that can monitor the WUS at ultra-low power and turns on the main radio only when data transmission and reception are required.

[0189] In one embodiment, at step 501, the base station may transmit a WUS corresponding to ON or OFF to the terminal.

[0190] At step 502, the terminal can receive WUS using WUR.

[0191] At step 503, the terminal can trigger the main radio to be in the OFF or ON state based on the information that the received signal corresponds to ON or OFF.

[0192] At step 504, the terminal can set the main radio to wake up or power off. In one embodiment, the terminal can also be set to a deep sleep (DS) or ultra deep sleep (UDS) state rather than completely OFF.

[0193] If data traffic to be transmitted from the base station to the terminal occurs (step 505), and the WUS transmitted by the base station in step 501 is a signal corresponding to ON, then in step 506, the main radio can be turned ON, and the terminal can receive the data transmitted by the base station through the main radio, not the WUR.

[0194] In one embodiment, the power consumption for monitoring a WUS depends on the hardware modules of the WUR used for WUS design, signal detection and processing, so that the benefits may be maximized for power-sensitive and small form factor devices including IoT use cases (e.g., industrial sensors, controllers) and wearables.

[0195] In one embodiment, a terminal including a wake-up receiver may report to a base station that it has the capability to wake up the main radio using the wake-up receiver, or that it has the capability to receive capability information or PEI that the terminal includes a wake-up receiver.

[0196] According to one embodiment, the terminal may report capability information for the wake-up receiver or capability information for receiving PEI to the base station through the terminal capability information reporting procedure of FIG. 4.

[0197] According to one embodiment, the terminal may report capability information about the wake-up receiver or capability information about the ability to receive PEI to the base station through at least one step of the random access preamble or the uplink data channel in the random access procedure of FIG. 3. According to one embodiment, sets of random access preambles that can be transmitted by a terminal including a wake-up receiver or having capability information about the ability to receive PEI may be transmitted to the terminal as system information. The terminal may select a random access preamble from the set received by the terminal, and transmit a random access preamble based on the selected random access preamble in step 310 of the random access procedure of FIG. 3. According to one embodiment, after reporting capability information about the wake-up receiver or capability information about the ability to receive PEI to the base station, the terminal may receive information indicating whether to use the wake-up receiver or whether to use PEI from the base station through a higher layer signal or a physical signal.

[0198] In one embodiment, when a base station supports a terminal including a wake-up receiver (e.g., when the base station has hardware capable of transmitting a wake-up signal), the base station may determine whether to use the wake-up receiver after receiving capability information about the wake-up receiver from the terminal. In one embodiment, the base station may transmit a signal to the terminal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal. In one embodiment, the base station may transmit to the terminal at least one of instruction information for activating the terminal's reception of the wake-up signal or the wake-up receiver, or instruction information for notifying the base station of transmission of the wake-up signal. After a slot configured (or defined in the standard) by the base station from a slot in which the signal is received, the terminal may turn off the main radio and turn on the wake-up receiver for monitoring the wake-up signal. In one embodiment, the terminal may transmit to the base station at least one of feedback that it has received a signal indicating whether to use the wake-up receiver before turning off the main radio or feedback that it has turned off the main radio and turned on the wake-up receiver.

[0199] In one embodiment, when a base station does not support a terminal having a wake-up receiver, the base station may receive capability information about the wake-up receiver from the terminal and then transmit a signal to the terminal indicating that the wake-up receiver is unusable. The terminal may transmit feedback to the base station indicating that it has received a signal indicating that the wake-up receiver is unusable. In one embodiment, the terminal may perform an operation according to parameters of the existing power saving method set by the base station using an existing power saving method (e.g., C-DRX or I-DRX such as paging).

[0200] In one embodiment, the terminal may determine whether to activate or deactivate the wake-up receiver based on the reception of a wake-up signal transmitted from the base station. Alternatively, the terminal may determine whether to activate or deactivate the wake-up receiver based on the reception of a synchronization signal transmitted from the base station.

[0201] According to various embodiments of the present disclosure, after a capability report of a terminal having a wake-up receiver and a procedure for determining whether the wake-up receiver is supported (or permitted) by a base station, the wake-up receiver of the terminal may perform an operation of turning on and off the main radio of the terminal by receiving a wake-up signal. In one embodiment, the terminal may independently perform the operation of turning on / off the main radio, the operation of reporting the capability of the terminal having the wake-up receiver, or the operation procedures for determining whether the wake-up receiver is supported by the base station. For example, even if the capability report operation and the permission procedure of the terminal are not performed, the base station may transmit a signal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal to the terminal. Accordingly, among the terminals receiving a signal from the base station, a terminal having a wake-up receiver may perform an operation of turning on / off the main radio through the wake-up receiver.

[0202] According to one embodiment, after the capability report operation of the terminal and the base station authorization procedure or the decision on whether to use the wake-up receiver of the terminal are performed, the operation of turning on / off the main radio through the wake-up receiver may be applied to all terminals within the cell supported by the base station (e.g., RRC_CONNECTED terminals, RRC_IDLE / RRC_INACTIVE terminals, or terminals accessing the cell (e.g., RRC_CONNECTED terminals)). If the capability report operation of the terminal and the base station authorization procedure are not performed, the operation of turning on / off the main radio through the wake-up receiver may be applied to RRC_IDLE / RRC_INACTIVE terminals camping within the cell supported by the base station. In addition, various embodiments of the present disclosure may include at least one of all, part, or a combination of parts of various operations of a terminal and a base station including a wake-up receiver described below.

[0203] Hereinafter, according to various embodiments of the present disclosure, operations for turning on and off the main radio of a terminal having a wake-up receiver are described. Various embodiments of the present disclosure may include at least one of all, some, or a combination of some of the various operations of a terminal and a base station including a wake-up receiver as disclosed below.

[0204] According to one embodiment, when the main radio of the terminal is on, the terminal can receive a downlink signal (or data) from the base station via the main radio. According to various embodiments of the present disclosure, the main radio being 'on' may be expressed as the main radio being 'turned on' or the main radio being 'activated', and may have a similar or substantially equivalent meaning thereto. According to one embodiment, the main radio being activated may mean that specific components of the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned on or activated, or may be defined by a standard (e.g., 3GPP TS document). However, according to various embodiments of the present disclosure, without being limited to the above, the main radio being activated may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto. Alternatively, the activation of the main radio may include the main radio performing reception operations on specific channels or signals defined in the 3GPP TS document (e.g., SS / PBCH blocks containing synchronization signals or PDCCHs containing downlink control channels).

[0205] In one embodiment, when the main radio of the terminal is off, the terminal may be considered to be in a sleep period, or the terminal may not receive a downlink signal (or data) from the base station. In various embodiments of the present disclosure, the main radio being 'off' may be expressed as the main radio being 'turned off' or the main radio being 'deactivated', and may have a similar or substantially equivalent meaning thereto. In one embodiment, the main radio being deactivated may mean that specific components of the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned off or deactivated, or may be defined by a standard (e.g., 3GPP TS document). However, in various embodiments of the present disclosure, without being limited to the above, the main radio being deactivated may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto. Alternatively, the main radio being disabled may include the main radio no longer performing reception operations on specific channels or signals defined in the 3GPP TS document (e.g., SS / PBCH blocks containing synchronization signals or PDCCHs containing downlink control channels).

[0206] As previously explained, in order to save power consumption, the main radio is triggered to turn on through the wake-up receiver only when the terminal receives a wake-up signal from the base station, so that the main radio can receive a downlink signal from the base station, or the main radio can be turned off when the wake-up signal is not received. In this case, the terminal in the RRC IDLE or RRC INACTIVE state may skip the PEI reception described above and attempt to receive paging immediately upon receiving the wake-up signal. Alternatively, the terminal in the RRC IDLE or RRC INACTIVE state may, depending on the terminal implementation, perform the PEI reception described above and then attempt to receive paging upon receiving the wake-up signal, or may skip the PEI reception and attempt to receive paging immediately.

[0207] According to various embodiments of the present disclosure, even when the base station does not transmit a wake-up signal to the terminal, the terminal may determine that the wake-up signal has been received due to noise such as additive white Gaussian noise (AWGN) or intra- or inter-cell interference. In this case, the terminal may trigger the main radio to be turned on due to the wake-up signal to perform PDCCH decoding for paging reception, which may result in unnecessary power consumption. To reduce the rate of judgments regarding the reception of such erroneous wake-up signals (e.g., false alarms), PEI reception may still be required.

[0208] Accordingly, the present invention describes various methods and methods for determining whether a terminal receives a wake-up signal by a wake-up receiver and then receives PEI (e.g., whether to enable or disable PEI monitoring).

[0209] For example, if the PEI is not monitored by the above-described method, the terminal can receive control and data channels related to paging in a paging okay after receiving a wake-up signal. If the PEI is monitored by the above-described method, the terminal can receive the wake-up signal, and additionally, after receiving the PEI, when the PEI instructs the terminal to receive paging (for example, when the subgroup to which the terminal belongs and the paging okay are instructed), the terminal can receive control and data channels related to paging in the paging okay. In addition, when the PEI does not instruct the terminal to receive paging (for example, when the subgroup to which the terminal belongs and the paging okay are not instructed), the terminal may skip page reception.

[0210] At this time, a method is additionally described to reduce unnecessary power consumption in cases where all terminals within the subgroup to which the terminal indicated by PEI belongs do not need to receive paging by triggering the main radio to be on even when the terminal is monitoring PEI.

[0211] In describing various embodiments of the present disclosure below, it should be understood that operations or procedures expressed as being performed by a main radio or a wake-up receiver for a terminal equipped with a wake-up receiver (e.g., a terminal having the capability of wake-up reception) may also be understood as being performed by the terminal equipped with the wake-up receiver (e.g., a terminal having the capability of wake-up reception).

[0212] [Enable / Disable PEI Monitoring]

[0213] According to various embodiments of the present disclosure, specific methods for enabling or disabling PEI monitoring are described.

[0214] In one embodiment, if a terminal having a wake-up receiver has the capability to receive PEI, the terminal may enable or disable PEI monitoring.

[0215] In one embodiment, if a terminal equipped with a wake-up receiver does not have the capability to receive PEI, the terminal may disable PEI monitoring. Alternatively, if a terminal equipped with a wake-up receiver has the capability to receive PEI, the terminal may receive an explicit instruction from the base station regarding whether to enable or disable PEI monitoring and decide based on the instruction, or may decide implicitly in association with specific information. Alternatively, the terminal may decide whether to enable or disable PEI monitoring based on its own judgment, depending on the terminal implementation. If the terminal disables PEI monitoring according to the above-described decision method, the terminal may be able to save power by not performing PEI monitoring, or if PEI monitoring is enabled, the terminal may require additional power consumption due to PEI monitoring, but may reduce false alarms in wake-up signal reception.

[0216] [Example 1]

[0217] In one embodiment, whether a terminal disables or enables PEI monitoring may be determined in relation to the number of subgroups set for the terminal, with respect to the subgroups to which the terminal belongs as indicated by PEI.

[0218] For example, if the number of subgroups is greater than X, monitoring of PEI can be enabled, and the wake-up receiver can monitor the wake-up signal, and when the wake-up signal is received, trigger the main radio to turn on and perform monitoring of PEI.

[0219] For example, if the number of subgroups is less than X, monitoring of PEI can be disabled, and the wakeup receiver can monitor the wakeup signal, and when the wakeup signal is received, trigger the main radio to turn on, and skip monitoring of PEI.

[0220] At this time, the number of subgroups and X described above can be transmitted to the terminal by a higher level signal (e.g., system information, or radio resource control (RRC)).

[0221] If the base station does not support the subgrouping described above, the terminal may determine the number of subgroups as a specific number (e.g., 0) or determine that no subgroup exists. Therefore, if X is set to be greater than 0, the terminal may disable PEI monitoring. Alternatively, the terminal may determine X to be infinity (or infinity) and disable PEI monitoring. The wakeup receiver may monitor the wakeup signal, and if a wakeup signal is received, trigger the main radio to turn on and skip monitoring of PEI.

[0222] [Example 2]

[0223] In one embodiment, whether the terminal disables or enables PEI monitoring may be determined upon receipt of a wake-up signal by the terminal in relation to subsequent actions of the terminal indicated by the wake-up signal.

[0224] For example, if the wake-up signal indicates a terminal-only operation (e.g., an RRC connection request or a random access of the terminal), monitoring of the PEI can be enabled, and the wake-up receiver can monitor the wake-up signal, trigger the main radio to turn on when the wake-up signal is received, and perform monitoring of the PEI. According to the above-described methods, the terminal can solve the power consumption problem by performing a series of terminal-only operations when a false alarm of the wake-up signal occurs. For example, the terminal can reduce false alarms caused by the wake-up signal by performing PEI monitoring and controlling the reception of the PEI.

[0225] In one embodiment, if the wake-up signal instructs one or more terminals (e.g., a group of terminals or all terminals within a cell) to take action (e.g., update or change system information), monitoring of the PEI may be disabled, and the wake-up receiver may monitor the wake-up signal and, if the wake-up signal is received, trigger the main radio to turn on and skip monitoring of the PEI.

[0226] According to one embodiment, possible subsequent actions of the terminal that can be indicated in the wake-up signal may be determined by the standard or may be set by a higher-level signal (e.g., system information or RRC), and one of them may be transmitted to the terminal by the wake-up signal.

[0227] [Example 3]

[0228] In one embodiment, whether a terminal disables or enables PEI monitoring may be determined upon receipt of a wake-up signal by the terminal in relation to a specification release (or version) of the terminal that the wake-up signal may indicate.

[0229] For example, if the wake-up signal indicates that there is a terminal of another release other than Rel-19 in the cell, monitoring of PEI can be enabled, and the wake-up receiver can monitor the wake-up signal and, when the wake-up signal is received, trigger the main radio to turn on and perform monitoring of PEI.

[0230] For example, if the wake-up signal indicates that only Rel-19 terminals are present in the cell, monitoring of PEI can be disabled, and the wake-up receiver can monitor the wake-up signal and, when the wake-up signal is received, trigger the main radio to turn on and skip monitoring of PEI.

[0231] [Example 4]

[0232] In one embodiment, whether the terminal disables or enables PEI monitoring may be determined based on a bit field that may be indicated in the wake-up signal when the terminal receives the wake-up signal.

[0233] For example, if the wake-up signal includes a bit field indicating enabling of PEI monitoring, monitoring of PEI can be enabled, and the wake-up receiver can monitor the wake-up signal, and when the wake-up signal is received, trigger the main radio to turn on and perform monitoring of PEI.

[0234] For example, if the wake-up signal includes a bit field indicating disabling of PEI monitoring, monitoring of PEI can be disabled, and the wake-up receiver can monitor the wake-up signal and, when the wake-up signal is received, trigger the main radio to turn on and skip monitoring of PEI.

[0235] [Example 5]

[0236] For example, whether a terminal disables or enables PEI monitoring can be determined by receiving a bit field that can be indicated by a higher-order signal or a separate higher-order signal that contains settings related to wake-up reception.

[0237] For example, if the upper signal includes a bit field indicating enabling of PEI monitoring, monitoring of PEI can be enabled, and the wakeup receiver can monitor the wakeup signal, and when the wakeup signal is received, trigger the main radio to turn on and perform monitoring of PEI.

[0238] For example, if the upper signal includes a bit field indicating disabling of PEI monitoring, monitoring of PEI can be disabled, and the wakeup receiver can monitor the wakeup signal and, when the wakeup signal is received, trigger the main radio to turn on and skip monitoring of PEI.

[0239] [Example 6]

[0240] According to various embodiments of the present disclosure, whether a terminal disables or enables PEI monitoring may be determined by the terminal implementation at its own discretion.

[0241] In one embodiment, for example, after receiving a wake-up signal, the terminal may perform PEI monitoring to check whether the wake-up signal has been properly received and whether information indicated by the received wake-up signal is valid, or may check whether the paging OK and subgroup indication fields in the PEI indicate that the terminal should receive a paging OK or paging information. Alternatively, the terminal may perform PEI monitoring after receiving the wake-up signal, receive a TRS availability indication field in the PEI, and perform time / frequency synchronization, AGC, channel estimation, etc. based on the received TRS resource set instead of using SSB. In this case, the subgroup indicated by the wake-up signal and the subgroup indicated by the PEI may be the same, and settings related thereto may be provided by the embodiment in FIG. 7.

[0242] In one embodiment, if the terminal determines that the information received in the wake-up signal is the same as the information received in the PEI, the terminal may determine that the received information is correct and perform paging reception on the paging OK. The information received by the terminal via the wake-up signal or PEI may include at least one of information indicating a subgroup or information indicating a paging OK.

[0243] In one embodiment, if the terminal determines that the information received in the wake-up signal is different from the information received in the PEI, the terminal may perform at least one of the following procedures.

[0244] First, the terminal can perform subsequent actions based on information received from the PEI. For example, even if the main radio of the terminal is turned on by a wake-up signal to receive a paging signal, the terminal can perform paging reception only if the PEI instructs the terminal to receive paging from a subgroup of the paging order to which the terminal belongs. Otherwise, the main radio of the terminal can be turned off.

[0245] Second, the terminal can receive the paging signal only if the information received in the wake-up signal matches the information received in the PEI, otherwise the terminal's main radio can be turned off.

[0246] Third, the terminal may determine that the information received via the wake-up signal is unreliable. If this situation occurs at least X times, the terminal may disable the wake-up receiver to stop receiving the wake-up signal and turn on the main radio. Here, X may be indicated by the base station through a higher layer signal or system information.

[0247] Hereinafter, embodiments related to subgrouping when monitoring of PEI is disabled or enabled according to various embodiments of the present disclosure are specifically described through FIGS. 6 and 7.

[0248] FIG. 6 illustrates an example of a method for distinguishing groups of terminals equipped with wake-up receivers according to various embodiments of the present disclosure. More specifically, FIG. 6 illustrates an example in which a terminal receives information about a subgroup indicated by a PEI via a wake-up signal when PEI monitoring is disabled.

[0249] In one embodiment, although not shown in FIG. 6, it may also be possible for the terminal to additionally receive information about a paging okay via a wake-up signal.

[0250] According to one embodiment, the information about the subgroup and the paging okayness included in the wake-up signal may be determined based on the configuration information about the subgroup and the paging okayness including the number of subgroups set by the upper signal for PEI. Alternatively, the terminal may receive the configuration information about the subgroup and the paging okayness including the number of subgroups by a separate upper signal or an upper signal for configuring the reception of the wake-up signal, and may determine the information about the subgroup based on the configuration information.

[0251] FIG. 7 illustrates another example of a method for distinguishing groups of terminals equipped with wake-up receivers, according to various embodiments of the present disclosure. More specifically, FIG. 7 illustrates an example in which, when PEI monitoring is enabled, a terminal receives information about a subgroup indicated by a PEI and information about a separate subgroup (e.g., a sub-subgroup) via a wake-up signal.

[0252] Although not shown in FIG. 7, it may also be possible to receive information about paging okies through a wake-up signal.

[0253] In one embodiment, information about a subgroup received by a terminal in a wake-up signal may be utilized to further reduce the number of terminals within a subgroup indicated by a PEI. For example, a specific subgroup indicated by a PEI may be further divided into subgroups indicated by a wake-up signal, and only some terminals within a specific subgroup determined based on information about the subgroup associated with the PEI and the wake-up signal may trigger their main radios to turn on to monitor the PEI. Accordingly, power consumption for receiving paging may be reduced.

[0254] In one embodiment, the information about the subgroups received by the terminal in the wake-up signal may be determined based on configuration information about the subgroups and paging occupancy, including the number of subgroups set by the upper signal for PEI. Alternatively, the terminal may determine the information about the subgroups by receiving configuration information about the subgroups and paging occupancy, including the number of subgroups, based on a separate upper signal or an upper signal for configuring wake-up signal reception.

[0255] FIG. 8 illustrates an example of a method for receiving a paging early indication (PEI) of a terminal equipped with a wake-up receiver according to various embodiments of the present disclosure. More specifically, FIG. 8 illustrates an example of a method for receiving a wake-up signal, PEI, and paging of a terminal equipped with a wake-up receiver according to various embodiments of the present disclosure.

[0256] According to various embodiments of the present disclosure, a method for determining a PF of a terminal having a wake-up receiver within N (e.g., the number of cell-common PFs per DRX cycle) and transmitting and receiving paging in the PF is specifically described. Through the method, the terminal can determine whether to monitor PEI after receiving a wake-up signal, depending on enabling or disabling PEI monitoring, and can determine whether to receive paging through the wake-up signal and PEI reception, and can receive paging. Since paging frames of all terminals in a cell including a terminal having a wake-up receiver can be supported within the number of cell-common PFs, there may be no need for additional resources due to introduction of additional paging frames of the terminal having a wake-up receiver, and there is an advantage that the complexity of scheduling of a base station due to paging support for the terminal having a wake-up receiver does not increase.

[0257] According to various embodiments of the present disclosure, a method for receiving a wake-up signal, PEI, and paging when PEI monitoring is enabled is specifically described.

[0258] According to one embodiment, a method for determining PF is first described.

[0259] Referring to the top of Figure 8, an SFN in which a wake-up signal is received and an SFN (e.g., a radio frame) in which a PEI is received are illustrated. Based on the radio frame in which the wake-up signal is received, a WUS-FrameOffset may be added, and additionally, a pei-FrameOffset may be added to determine a paging frame (PF).

[0260] WUS-FrameOffset can be determined by considering the time required for the wake-up receiver of the terminal to receive the wake-up signal, the time required to wake up the main radio from the wake-up signal, and the time required for the main radio to receive PEI.

[0261] WUS-FrameOffset can be received by the terminal through a higher-level signal, such as system information. Alternatively, WUS-FrameOffset can be received by the terminal by being included in a wake-up signal.

[0262] pei-FrameOffset can be determined by considering the time required for the terminal to receive PEI and the time required for the terminal to receive paging from the PEI, and pei-FrameOffset can be received by a higher-level signal such as system information. Alternatively, pei-FrameOffset can be included in a wake-up signal and received by the terminal.

[0263] If the PF determined by the above-described methods is not included in the cell common PF, the paging frame can be determined based on the cell common PF that exists next.

[0264] In the embodiment of FIG. 8, as an example, assuming {PF_offset=3, T=128, N=T / 4=32, Ns=4, and UE_ID mod 32 is 1, floor (UE_ID / 32) mod 4 is 1 UE_ID}, the embodiment illustrates a case where every fourth radio frame (e.g., SFN of ..., -3, 1, 5, 9, ...) is a cell-common PF by N=T / 4 and PF_offset=3. According to one embodiment, in NR, radio frames can be from 0 to 1023, and the radio frame following 1023 repeats numbers starting from 0 to 1023, so the above-described radio frame -3 can mean radio frame 1021 (= -3 mod 1024).

[0265] In one embodiment, if the paging frame (PF) determined by adding WUS-FrameOffset and additionally adding pei-FrameOffset based on the radio frame in which the wake-up signal is received is 2, then the next cell common PF, 5, may be determined as the PF in which the UE must receive paging. Since this method determines the PF by the conventional method described above as a radio frame in which the SFN is 1, 129, 257, ... by {(SFN + 3) mod 128 = (128 div 32)*(UE_ID mod 32) = 4*1 = 4}, it may be possible to receive paging faster compared to the case in which the next PF is 129.

[0266] According to one embodiment of the present invention, the terminal may not expect that the PF that should receive the paging determined by the above-described method is not included in the cell-common PF. For example, the terminal may expect that the PF determined by the above-described method is always included in the cell-common PF. Accordingly, the base station may perform scheduling so that the PF determined by the above-described method is always included in the cell-common PF.

[0267] According to various embodiments of the present disclosure, a method for receiving a wake-up signal and paging when PEI monitoring is disabled is described.

[0268] According to one embodiment, a method for determining PF is first described.

[0269] Referring to the bottom of Figure 8, an SFN (e.g., a radio frame) in which a wake-up signal is received is illustrated. A paging frame (PF) can be determined by adding a WUS-FrameOffset based on the radio frame in which the wake-up signal is received.

[0270] WUS-FrameOffset can be determined by considering the time required for the wake-up receiver of the terminal to receive a wake-up signal, the time required to wake up the main radio from the wake-up signal, and the time required for the main radio to receive a paging signal.

[0271] WUS-FrameOffset can be received by a higher-level signal, such as system information. Alternatively, WUS-FrameOffset can be received by the terminal as part of a wake-up signal.

[0272] If the PF determined by the above-described methods is not included in the cell common PF, the paging frame can be determined based on the cell common PF that exists next.

[0273] In the embodiment of FIG. 8, as an example, assuming {PF_offset=3, T=128, N=T / 4=32, Ns=4, and UE_ID mod 32 is 1, floor (UE_ID / 32) mod 4 is 1 UE_ID}, the case where every fourth radio frame (e.g., SFN of ..., -3, 1, 5, 9, ...) is a cell-common PF by N=T / 4 and PF_offset=3 is illustrated. According to one embodiment, in NR, radio frames are from 0 to 1023, and the radio frame following 1023 repeats numbers starting from 0 to 1023, so the above-described radio frame -3 can mean radio frame 1021 (= -3 mod 1024).

[0274] In one embodiment, if the paging frame (PF) determined by adding WUS-FrameOffset based on the radio frame in which the wake-up signal is received is 2, then the next cell common PF, 5, may be determined as the PF in which the UE should receive paging. This method may enable faster paging reception compared to the case in which the next PF is 129, since the PF in the conventional method described above is determined as a radio frame in which the SFN is 1, 129, 257, ... by {(SFN + 3) mod 128 = (128 div 32)*(UE_ID mod 32) = 4*1 = 4}.

[0275] According to one embodiment of the present invention, the terminal may not expect that the PF that should receive the paging determined by the above-described method is not included in the cell-common PF. For example, the terminal may expect that the PF determined by the above-described method is always included in the cell-common PF. Accordingly, the base station may perform scheduling so that the PF determined by the above-described method is always included in the cell-common PF.

[0276] Hereinafter, a method for determining a PO within a PF is specifically described. In one embodiment, the method for determining a PO within a PF can be applied regardless of whether PEI monitoring is enabled or disabled.

[0277] In one embodiment, first, the determination of PO may be applied in the same manner as for existing terminals (e.g., legacy terminals) that do not have a wake-up receiver. For example, PO may be determined by the PO index i_s = floor (UE_ID / N) mod Ns, where Ns may denote the number of POs in one PF and may be determined by a higher-level signal such as system information.

[0278] In one embodiment, secondly, the determination of PO may be performed by applying different parameters than for existing terminals without a wake-up receiver. For example, instead of Ns applied to existing terminals, Ns_WUS applied to terminals with a wake-up receiver may be introduced. For example, PO may be determined by the index of PO i_s = floor (UE_ID / N) mod Ns_WUS. Here, Ns_WUS may mean the number of POs in one PF of terminals with a wake-up receiver, and may be determined by a higher-order signal such as system information.

[0279] Thirdly, according to one embodiment, the determination of PO may be performed in the same manner as for an existing terminal without a wake-up receiver, but by adding new additional parameters. For example, the PO may be determined by the index of the PO i_s = floor (UE_ID / N) mod Ns + WUS-offset. Here, Ns may denote the number of POs in one PF and may be determined by a higher-order signal such as system information. Here, the WUS-offset may indicate an offset in the time domain (e.g., an offset in units of OFDM symbols or subframes). According to one embodiment, the above-described parameters may be transmitted to a terminal with a wake-up receiver via a higher-order signal such as system information.

[0280] In one embodiment of the present invention, the starting position (e.g., OFDM symbol or subframe position) and the amount of resources in the time domain of PO resources corresponding to the above-described i_s can be transmitted to a terminal equipped with a wake-up receiver through an upper signal including system information.

[0281] According to various embodiments of the present disclosure, the various operations or examples disclosed in FIGS. 5 to 8 may be performed in combination with or separately from various operations according to various embodiments of the present disclosure, and may not be individually essential components.

[0282] Hereinafter, a procedure for waking up the main radio when it is in a sleep state is described according to various embodiments of the present disclosure. In one embodiment, the operation of waking up the main radio may be performed in conjunction with various operations according to various embodiments of the present disclosure, or may be performed separately, and may not be an essential component.

[0283] According to various embodiments of the present disclosure, when a base station has a channel or signal to transmit to a terminal, the base station may transmit a wake-up signal to the terminal. The terminal or the wake-up receiver may receive the wake-up signal and turn on the main radio. According to one embodiment, the act of receiving the wake-up signal itself may be an instruction to wake up the main radio. According to one embodiment, the wake-up signal may include K information bits, and information to wake up the main radio may be mapped to the K information bits. For example, if the information bit included in the wake-up signal is 1 bit of information, '1' may indicate ON, and '0' may indicate OFF.

[0284] In one embodiment, from a base station transmission perspective, it may be predefined at what point in time a wake-up signal is to be transmitted prior to transmission of a channel or signal. From a terminal reception perspective, it may also be predefined at what point in time a wake-up signal can be received prior to reception of a channel or signal.

[0285] According to one embodiment, the terminal may transmit to the base station information regarding the time offset required between the wake-up signal and the transmission of the channel / signal, and the base station may set the time offset between the wake-up signal and the transmission of the channel / signal to the terminal based on the received information. According to one embodiment, the terminal may transmit to the base station information regarding the time offset required between the wake-up signal and the transmission of the channel / signal through a terminal capability information reporting procedure, or may transmit to the base station information regarding the time offset through a random access preamble or an uplink data channel in a random access procedure. Of course, without being limited thereto, the terminal may transmit to the base station information regarding the time offset through a higher layer signal or through various signals. The base station may set to the terminal information regarding the time offset between the wake-up signal and the transmission of the channel / signal through a downlink data channel of a random access response (e.g., message 2) or a random access contention resolution (e.g., message 4) in a random access procedure. Of course, without being limited thereto, the base station may set to the terminal information regarding the time offset through a higher layer signal or through various signals.

[0286] According to various embodiments of the present disclosure, when a base station has a periodic channel or periodic signal to transmit to a terminal, instead of the base station transmitting a wake-up signal every time there is a channel or signal to transmit, the terminal or wake-up receiver can turn on the main radio according to a period based on setting information of the periodic channel or periodic signal set by the base station.

[0287] In one embodiment, the base station may transmit a wake-up signal only during the first transmission of a periodic channel or periodic signal, and may omit transmission of the wake-up signal during subsequent repeated transmissions of the channel or signal. In this case, the terminal or wake-up receiver may turn on the main radio based on the period according to the configuration information of the periodic channel or periodic signal set by the base station.

[0288] According to one embodiment, the types of periodic channels or periodic signals transmitted and received between the base station and the terminal may be predefined. According to one embodiment, the types of periodic channels or periodic signals may be configured by the base station. The base station may configure the types of periodic channels or periodic signals to the terminal through a downlink data channel for a random access response (e.g., message 2) or a random access contention resolution (e.g., message 4), or may configure the types of periodic channels or periodic signals to the terminal through a higher-level signal indicating configuration information for receiving a wake-up signal or another higher-level signal.

[0289] According to various embodiments of the present disclosure, when a terminal has a channel or signal to transmit to a base station (e.g., a Physical Random Access Channel (PRACH) or a Scheduling Request (SR) or a Buffer Status Report (BSR)), or when the terminal performs L1 / L3-based measurement, the terminal or wake-up receiver can turn on the main radio regardless of the wake-up signal transmitted by the base station.

[0290] In one embodiment, a wake-up receiver may receive a wake-up signal for uplink transmission or L1 / L3 based measurement transmitted by a terminal to a base station and may not apply the operation of turning on and off the main radio of the terminal.

[0291] According to one embodiment, the type of uplink channel or uplink signal or L1 / L3-based measurement of the terminal transmitted regardless of the reception operation of the wake-up signal may be predefined. According to one embodiment, the type of uplink channel or uplink signal or L1 / L3-based measurement may be configured by the base station. The base station may configure the type of uplink channel or uplink signal or L1 / L3-based measurement to the terminal through a random access response (e.g., message 2) or a random access contention resolution (e.g., message 4) downlink data channel, or may configure the terminal through a higher-order signal indicating configuration information for reception of the wake-up signal or another higher-order signal.

[0292] Hereinafter, according to various embodiments of the present disclosure, an operation for turning off the main radio when the main radio is in the on state is described. According to one embodiment, the operation for waking up the main radio when the main radio is in the on state may be performed in conjunction with various operations according to various embodiments of the present disclosure, or may be performed separately, and may not be an essential component.

[0293] According to various embodiments of the present disclosure, a base station may transmit a sleep signal to a terminal when there is no channel or signal to be transmitted to the terminal. The terminal or the wake-up receiver may receive the sleep signal and turn off the main radio. According to one embodiment, the act of receiving the sleep signal itself may be an instruction to wake up the main radio. According to one embodiment, the sleep signal may be configured as a separate sequence from the wake-up signal. According to one embodiment, the sleep signal may include information in which information to wake up the main radio is mapped to K information bits included in the wake-up signal. For example, in the case of 1 bit of information, '0' may indicate OFF, and '1' may indicate ON.

[0294] According to various embodiments of the present disclosure, the main radio of a terminal may be turned off when a set condition is satisfied. In one embodiment, the set condition for the main radio may be when the main radio fails to detect or decode a downlink control channel, a specific channel, or a signal during a set period. In one embodiment, the base station may set configuration information (e.g., information including a period and a specific channel or signal) for the terminal to determine to turn off the main radio to the terminal via a higher-order signal indicating configuration information for receiving a wake-up signal or another higher-order signal.

[0295] According to various embodiments of the present disclosure, the main radio of a terminal may always be turned off after receiving a channel or signal. In one embodiment, after the wake-up receiver receives a wake-up signal from a base station, the main radio is turned on and receives a channel or signal, and then the main radio is turned off. In one embodiment, the time required for the main radio to be turned off after the channel or reception is completed may be predefined. In one embodiment, the terminal may transmit information regarding the time required for the main radio to be turned off to the base station, and the base station may set the required time for the terminal based on the received information. In one embodiment, the information regarding the required time transmitted by the terminal may be transmitted to the base station through a terminal capability information reporting procedure. In one embodiment, the information regarding the required time transmitted by the terminal may be transmitted to the base station via a random access preamble or an uplink data channel. Of course, the present invention is not limited thereto, and the terminal may transmit the information regarding the required time to the base station via an upper layer signal. The base station can set the required time information to the terminal via the downlink data channel of the random access response (e.g., message 2) or random access contention resolution (e.g., message 4). Of course, this is not limited to this, and the base station can set the required time information to the terminal via an upper layer signal.

[0296] Hereinafter, according to various embodiments of the present disclosure, when a terminal or a main radio of the terminal is in an RRC_CONNECTED state, the terminal may be configured with C-DRX (connected mode DRX) so that the main radio may wake up and perform PDCCH reception at each DRX cycle. According to one embodiment, when the terminal or the main radio of the terminal is in an RRC_CONNECTED state, the terminal (or the main radio) may be configured to receive a signal indicating whether the terminal should receive PDCCH in the next DRX cycle.

[0297] In one embodiment, when the main radio is in RRC_IDLE / RRC_INACTIVE state, the terminal may be configured with I-DRX (idle mode DRX) so that the main radio wakes up every paging cycle to receive a paging PDCCH. In one embodiment, when the terminal or the main radio of the terminal is in RRC_CONNECTED state, the terminal (or the main radio) may be configured to receive a signal indicating whether the terminal should receive a paging PDCCH in the next paging cycle.

[0298] Hereinafter, according to various embodiments of the present disclosure, an embodiment of a procedure of a terminal operating as a wake-up receiver is provided when an operation in which ON / OFF is indicated based on reception of a wake-up signal of a wake-up receiver and a main radio and an operation according to a setting of C-DRX or I-DRX are mixed. According to one embodiment, an operation of a terminal or a main radio of the terminal related to an RRC CONNECTED / IDLE / INACTIVE state may be performed in combination with various operations according to various embodiments of the present disclosure, or may be performed separately, and may not be an essential component.

[0299] According to various embodiments of the present disclosure, when a terminal having a wake-up receiver receives a wake-up signal and performs an operation of turning on and off a main radio of the terminal, the terminal may not perform an operation according to the settings and configuration of C-DRX or I-DRX. In this case, instead of performing an operation according to the settings and configuration of C-DRX or I-DRX, the terminal may turn on the main radio of the terminal only when it receives a wake-up signal to wake up the main radio, and may receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) defined or configured to be received in C-DRX or I-DRX, respectively.

[0300] In one embodiment, when a terminal or a main radio of the terminal is in an RRC_CONNECTED state and an operation performed by a wake-up receiver is configured or activated by a base station, the terminal may turn on the main radio when the wake-up receiver receives a wake-up signal to wake up the main radio, and may also perform an operation related to C-DRX configured by the base station (e.g., the main radio receiving a PDCCH within drx_onDurationTimer for each DRX cycle). In one embodiment, the terminal (or the main radio) may not perform an operation configured to receive a signal (e.g., DCI format 2_6) indicating to the terminal whether to receive a PDCCH in the next DRX cycle. In one embodiment, when a terminal or a main radio of the terminal is in an RRC_IDLE / INACTIVE state and an operation performed by a wake-up receiver is configured or activated by a base station, the terminal may turn on the main radio when the wake-up receiver receives a wake-up signal to wake up the main radio, and may also perform an operation related to I-DRX configured by the base station (e.g., the main radio wakes up every paging cycle to receive a paging PDCCH). In one embodiment, the terminal (or the main radio) may not perform an operation configured to receive a signal (e.g., DCI format 2_7) indicating to the terminal whether to receive a paging PDCCH in the next paging cycle.

[0301] In one embodiment, instead of performing operations according to settings related to C-DRX or I-DRX, the terminal may perform operations for waking up the main radio according to a wake-up receiver and a wake-up signal according to various embodiments of the present disclosure and operations for turning off the main radio. If the operations performed by the wake-up receiver are deactivated by the base station, the operations related to C-DRX or I-DRX set by the base station may be performed again.

[0302] According to various embodiments of the present disclosure, when an operation performed by a wake-up receiver of a terminal is set or activated by a base station, and the terminal or the wake-up receiver receives a wake-up signal and the main radio is turned on, the terminal may transition to an RRC_CONNECTED state or may transition to an RRC_IDLE or RRC_INACTIVE state. According to one embodiment, whether the terminal may transition to a state may be predetermined or may be determined by a higher-order signal or a separate higher-order signal for configuring the operation of the wake-up receiver from the base station.

[0303] In one embodiment, as an example of a case where information regarding a transition of the terminal is predetermined, the state of the main radio may follow the state of the main radio most recently turned on and then turned off immediately before the current on time. In another embodiment, as an example of a case where information regarding a transition of the terminal is predetermined, the state of the main radio may not be affected by whether the wake-up receiver operation is set and activated. For example, the state of the main radio of the terminal may be determined only by a higher-order signal indicating at least one of RRC_CONNECTED, RRC_IDLE, or RRC_INACTIVE, and the terminal may determine that the state of the main radio does not change depending on whether the wake-up receiver operation is set and activated.

[0304] According to one embodiment, the wake-up signal may include K information bits, and information regarding at least one of whether the main radio will go to the RRC_CONNECTED state, the RRC_IDLE state, or the RRC_INACTIVE state may be mapped to the K information bits.

[0305] According to one embodiment, when the terminal or the main radio of the terminal is RRC_CONNECTED based on the determined state of the terminal, the main radio may wake up and receive a PDCCH for each DRX cycle by C-DRX configured from the base station, or the terminal (or the main radio) may be configured from the base station to receive a signal indicating to the terminal whether to receive a PDCCH in the next DRX cycle. According to one embodiment, when an operation for turning off the main radio according to various embodiments is performed while the terminal is receiving a PDCCH (e.g., during a period in which the PDCCH is received), the terminal may perform a procedure for turning off the main radio as a priority.

[0306] According to one embodiment, when the terminal or the main radio of the terminal is in RRC_IDLE / INACTIVE, the main radio may wake up and receive a paging PDCCH at each paging cycle by I-DRX configured from the base station. The terminal (or the main radio) may also be configured by the base station to receive a signal indicating to the terminal whether to receive a paging PDCCH in the next paging cycle. When an operation for turning off the main radio according to various embodiments is performed while the terminal is receiving the paging PDCCH (e.g., during a period in which the paging PDCCH is received), the terminal may perform the procedure for turning off the main radio as a priority.

[0307] According to various embodiments of the present disclosure, the operations of the various terminals (or main radios) described above may be performed regardless of the order, and it goes without saying that the subject of the operations may be a terminal or a main radio.

[0308] FIG. 9 illustrates an operational flow of a terminal equipped with a wake-up receiver for receiving PEI according to various embodiments of the present disclosure. More specifically, FIG. 9 illustrates an operational flow of enabling and disabling PEI, and receiving PEI and paging, of a terminal equipped with a wake-up receiver according to various embodiments of the present disclosure.

[0309] In step 910, the terminal may receive a wakeup activation signal from the base station to enable the terminal to receive a wakeup signal using the wakeup receiver. Alternatively, the terminal may receive a wakeup deactivation signal from the base station to no longer receive a wakeup signal using the wakeup receiver. In one embodiment, the terminal may receive information necessary for receiving a wakeup signal from the base station. In one embodiment, the terminal may receive a signal from the base station indicating whether to use the wakeup receiver or setting information for receiving a wakeup signal. In addition, the terminal may receive information necessary for enabling or disabling PEI monitoring, related information necessary for PEI reception, and information necessary for receiving paging from the base station.

[0310] In step 920, the terminal may receive a wake-up signal according to an embodiment of the present invention, determine whether to enable or disable monitoring of PEI, and receive paging after receiving the PEI depending on whether PEI is monitored. According to one embodiment, the terminal may determine whether to monitor PEI and receive PEI based on the determination. According to one embodiment, the terminal may be turned on to search for a wake-up signal by setting or activating a wake-up receiver, and when the wake-up signal is received, the terminal may receive paging in the PF / PO according to various embodiments of the present invention described above. According to one embodiment, when the wake-up receiver is not set or activated, the terminal may receive paging in the PF / PO determined based on a paging reception method for existing terminals.

[0311] FIG. 10 illustrates an operational flow of a base station for transmitting a PEI according to various embodiments of the present disclosure. More specifically, FIG. 10 illustrates an operational flow of a base station for transmitting a PEI and paging according to various embodiments of the present disclosure.

[0312] In step 1010, the base station may transmit a wakeup activation signal to the terminal to enable reception of a wakeup signal using the wakeup receiver. Alternatively, the base station may transmit a wakeup deactivation signal to the terminal to prevent the terminal from receiving the wakeup signal using the wakeup receiver any longer. According to one embodiment, the base station may transmit information necessary for receiving a wakeup signal to the terminal. According to one embodiment, the base station may transmit a signal indicating whether to use the wakeup receiver or setting information for receiving a wakeup signal to the terminal. According to one embodiment, the base station may also transmit at least one of information necessary for enabling or disabling PEI monitoring, related information necessary for PEI reception, and information necessary for receiving paging to the terminal. According to one embodiment, the base station may transmit information necessary for receiving paging to the terminal.

[0313] At step 1020, the base station may transmit PEI and paging according to various embodiments of the present invention described above. According to one embodiment, if the wake-up receiver is configured or activated and turned on to search for a wake-up signal and transmits a wake-up signal so that the terminal can receive the wake-up signal, the base station may transmit PEI according to various embodiments of the present invention. According to one embodiment, the base station may also transmit paging in a PF / PO according to various embodiments of the present invention. According to one embodiment, if the base station does not configure or activate the wake-up receiver for the terminal, the base station may transmit paging in a PF / PO determined based on a paging reception method for the existing terminal.

[0314] FIG. 11 illustrates a functional configuration of a terminal according to various embodiments of the present disclosure.

[0315] Referring to FIG. 11, the terminal includes an RF (Radio Frequency) processing unit (1110), a baseband processing unit (1120), a storage unit (1130), and a control unit (1140).

[0316] The RF processing unit (1110) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1110) up-converts the baseband signal provided from the baseband processing unit (1120) into an RF band signal, transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1110) 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 FIG. 11, only one antenna is illustrated, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (1110) may include multiple RF chains. Furthermore, the RF processing unit (1110) may perform beamforming. For beamforming, the RF processing unit (1110) can adjust the phase and amplitude 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 MIMO operations.

[0317] The baseband processing unit (1120) 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 (1120) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (1120) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (1110). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (1120) 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 (1120) divides the baseband signal provided from the RF processing unit (1110) into OFDM symbol units, restores signals mapped to subcarriers through an FFT (fast Fourier transform) operation, and then restores the received bit string through demodulation and decoding.

[0318] The baseband processing unit (1120) and the RF processing unit (1110) transmit and receive signals as described above. Accordingly, the baseband processing unit (1120) and the RF processing unit (1110) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (1120) and the RF processing unit (1110) may include multiple communication modules to support multiple different wireless access technologies. In addition, at least one of the baseband processing unit (1120) and the RF processing unit (1110) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Additionally, different frequency bands may include super high frequency (SHF) (e.g., 2.NRHz, NRhz) bands, millimeter wave (mm wave) (e.g., 60GHz) bands.

[0319] The storage unit (1130) stores data such as basic programs, application programs, and configuration information for the operation of the terminal. In particular, the storage unit (1130) can store information related to a second access node that performs wireless communication using a second wireless access technology. Furthermore, the storage unit (1130) provides the stored data upon request from the control unit (1140).

[0320] The control unit (1140) (or controller) controls the overall operations of the terminal. For example, the control unit (1140) transmits and receives signals through the baseband processing unit (1120) and the RF processing unit (1110). In addition, the control unit (1140) records and reads data in the storage unit (1140). For this purpose, the control unit (1140) may include at least one processor. For example, the control unit (1140) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit (1140) may further include a multi-connection processing unit (1142) that can multiply connect and process the storage unit (1130) and the baseband processing unit (1120).

[0321] FIG. 12 illustrates a functional configuration of a base station according to various embodiments of the present disclosure.

[0322] As illustrated in Figure 12, the base station is configured to include an RF processing unit (1210), a baseband processing unit (1220), a backhaul communication unit (1230), a storage unit (1240), and a control unit (1250).

[0323] The RF processing unit (1210) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1210) up-converts the baseband signal provided from the baseband processing unit (1220) 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 (1210) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In FIG. 12, only one antenna is illustrated, but the first access node may have multiple antennas. In addition, the RF processing unit (1210) may include multiple RF chains. Furthermore, the RF processing unit (1210) may perform beamforming. For beamforming, the RF processing unit (1210) may adjust the phase and magnitude of each signal transmitted and received through multiple antennas or antenna elements. The RF processing unit can perform downlink MIMO operations by transmitting one or more layers.

[0324] The baseband processing unit (1220) 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 (1220) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (1220) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (1210). For example, in the case of OFDM, when transmitting data, the baseband processing unit (1220) 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 (1220) divides the baseband signal provided from the RF processing unit (1210) 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 (1220) and the RF processing unit (1210) transmit and receive signals as described above. Accordingly, the baseband processing unit (1220) and the RF processing unit (1210) may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0325] The backhaul communication unit (1230) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (1230) converts a bit string transmitted from a primary base station to another node (e.g., an auxiliary base station, a core network, etc.) into a physical signal, and converts a physical signal received from another node into a bit string.

[0326] The storage unit (1240) stores data such as basic programs, application programs, and configuration information for the operation of the main base station. In particular, the storage unit (1240) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. Furthermore, the storage unit (1240) can store information that serves as a basis for determining whether to provide or terminate multiple connections to a terminal. Furthermore, the storage unit (1240) provides the stored data upon request from the control unit (1250).

[0327] The control unit (1250) (or controller) controls the overall operations of the base station. For example, the control unit (1250) transmits and receives signals through the baseband processing unit (1220) and the RF processing unit (1210) or through the backhaul communication unit (1230). In addition, the control unit (1250) records and reads data in the storage unit (1240). For this purpose, the control unit (1250) may include at least one processor. The control unit (1250) may further include a multi-connection processing unit (1252) capable of processing by multiply connecting the storage unit (1240), the backhaul communication unit (1230), and the baseband processing unit (1220).

[0328] 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.

[0329] 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 embodiments described in the claims or specification of the present disclosure.

[0330] 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 include multiple copies.

[0331] 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.

[0332] Meanwhile, the order of description in the drawings explaining the method of the present invention does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0333] Alternatively, the drawings illustrating the method of the present invention may omit some components and include only some components within a scope that does not harm the essence of the present invention.

[0334] In addition, the method of the present invention may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the invention.

[0335] Various embodiments of the present disclosure have been described above. The above description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be easily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims below rather than the detailed description described above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

[0336] In the specific embodiments of the present disclosure described above, components included in the 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.

[0337] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. For example, some or all of the embodiments may be combined with some or all of one or more other embodiments, and such combinations should naturally fall within the scope of the embodiments proposed in this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the claims described below, but also by equivalents thereof.

[0338] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. In a wireless communication system, a terminal (user equipment, UE) Transceiver; and Including a controller coupled with the above transceiver, The above controller, Receive a wake up signal (WUS) from a base station, which instructs a first subgroup of multiple terminals, When monitoring of PEI (paging early indication) is enabled, a PEI (paging early indication) indicating a second subgroup of multiple terminals is received from the base station, and configured to receive paging from the above base station, The above terminal is a terminal included in the first subgroup or the second subgroup.

2. In claim 1, when monitoring of the PEI is activated, the first subgroup is a terminal included in the second subgroup.

3. In claim 1, if monitoring of the PEI is not activated, the terminal is a terminal included in the first subgroup.

4. In claim 1, The above PEI is received after the WUS frame offset from the frame in which the wake-up signal is received, and The above paging is received by the terminal after the PEI frame offset from the frame in which the PEI is received.

5. In a wireless communication system, the base station, Transceiver; and Including a controller coupled with the above transceiver, The above controller, Transmitting a wake up signal (WUS) to a user equipment (UE) that indicates a first subgroup of multiple UEs, When monitoring of PEI (paging early indication) is enabled, a PEI (paging early indication) is transmitted to the terminal indicating a second subgroup of multiple terminals, and configured to transmit paging to the above terminal, The above terminal is a base station included in the first subgroup or the second subgroup.

6. In claim 5, when monitoring of the PEI is activated, the first subgroup is a base station included in the second subgroup.

7. In claim 5, if monitoring of the PEI is not activated, the terminal is a base station included in the first subgroup.

8. In claim 5, The above PEI is transmitted after the WUS frame offset from the frame in which the wake-up signal is received, and The above paging is a base station that transmits after the PEI frame offset from the frame in which the PEI is received.

9. A method performed by a user equipment (UE) in a wireless communication system, A step of receiving a wake up signal (WUS) from a base station, the wake up signal instructing a first subgroup of a plurality of terminals; When monitoring of PEI (paging early indication) is enabled, a step of receiving a PEI (paging early indication) indicating a second subgroup of multiple terminals from the base station; and comprising a step of receiving paging from the base station; A method wherein the terminal is included in the first subgroup or the second subgroup.

10. A method according to claim 9, wherein when monitoring of the PEI is activated, the first subgroup is included in the second subgroup.

11. A method according to claim 9, wherein the terminal is included in the first subgroup when monitoring of the PEI is not activated.

12. In claim 9, The above PEI is received after the WUS frame offset from the frame in which the wake-up signal is received, and The above paging is a method in which the PEI is received after the PEI frame offset from the frame in which the PEI is received.

13. A method performed by a base station in a wireless communication system, A step of transmitting, to a user equipment (UE), a wake up signal (WUS) indicating a first subgroup of a plurality of UEs; When monitoring of PEI (paging early indication) is enabled, a step of transmitting a PEI (paging early indication) indicating a second subgroup of multiple terminals to the terminal; and Including a step of transmitting paging to the terminal, A method wherein the terminal is included in the first subgroup or the second subgroup.

14. A method according to claim 13, wherein when monitoring of the PEI is activated, the first subgroup is included in the second subgroup.

15. A method according to claim 13, wherein the terminal is included in the first subgroup when monitoring of the PEI is not activated.

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