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

Abstract

A method performed by a terminal in a wireless communication system of the present invention comprises the steps of: receiving an activation signal for activating a wake-up receiver from a base station on the basis of a main radio MR; activating the wake-up receiver after receiving the activation signal; and switching the main radio to a sleep state after receiving the activation signal.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for activating or deactivating a wake-up receiver of a terminal having a wake-up receiver in a wireless communication system. Specifically, the present disclosure relates to a method and apparatus for activating and deactivating a wake-up receiver of a terminal having a wake-up receiver, so as to solve the problem of excessive power consumption of the terminal and achieve high energy efficiency in the wireless communication system. Background Art

[0002] 5G mobile communications technology defines a wide frequency band, enabling high transmission rates and new services. It can be implemented not only in "sub-6 GHz" frequency bands such as 3.5 GHz, but also in "above 6 GHz" frequency bands, known as millimeter waves (mmWave), including 28 GHz and 39 GHz. Furthermore, consideration is being given to implementing 6G mobile communications technology (referred to as the Beyond 5G system) in the terahertz band (e.g., the 95 GHz to 3 THz band) in order to achieve transmission rates fifty times faster than 5G mobile communications technology and ultra-low latency that is one-tenth that of 5G mobile communications technology.

[0003] In the early stages of 5G mobile communications technology development, to support services and meet performance requirements associated with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), standardization is underway on the following: beamforming and massive MIMO (Multiple Input Multiple Output) for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter waves; support for basic parameter sets (e.g., operating multiple subcarrier spacings) for efficient utilization of millimeter wave resources and dynamic operation of time slot formats; initial access technology for supporting multi-beam transmission and broadband; definition and operation of BWP (BandWidth Part); new channel coding methods such as LDPC (Low Density Parity Check) codes for large-scale data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, discussions are underway on improvements and performance enhancements to initial 5G mobile communication technologies in view of the services they will support, and there is already physical layer standardization on technologies such as: V2X (Vehicle-to-everything), for assisting driving determinations of autonomous vehicles based on information sent by the vehicle about the vehicle's position and status, and for enhancing user convenience; NR-U (New Radio Unlicensed), for system operation that complies with various regulatory requirements in unlicensed frequency bands; NR UE power saving; Non-Terrestrial Network (NTN), i.e., UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] In addition, standardization is underway for technologies such as the Industrial Internet of Things (IIoT), which supports new services through interoperability and integration with other industries; Integrated Access and Backhaul (IAB), which provides a node for expanding network service areas by integrating wireless backhaul and access links; enhanced mobility, including conditional handover and DAPS (Dual Active Protocol Stack) handover; and two-step random access (NR's 2-step RACH (Random Access Channel)) to simplify random access procedures. Regarding system architecture and services, standardization is also underway for a 5G baseline architecture (e.g., a service-based architecture or service-based interface) for combining Network Function Virtualization (NFV) and Software-Defined Networking (SDN) technologies, as well as Mobile Edge Computing (MEC), which enables UE location-based service delivery.

[0006] With the commercialization of 5G mobile communication systems, an exponentially increasing number of connected devices will be connected to the communication network. Accordingly, it is expected that enhanced functionality and performance of 5G mobile communication systems and operational integration of connected devices will become necessary. To this end, new research is being planned in conjunction with: extended reality (XR) to efficiently support AR (augmented reality), VR (virtual reality), MR (mixed reality), etc.; 5G performance improvements and complexity reduction through the use of artificial intelligence (AI) and machine learning (ML); AI service support; metaverse service support; and drone communications.

[0007] Furthermore, such developments in 5G mobile communication systems will serve not only as a foundation for developing: new waveforms for providing coverage in the terahertz band for 6G mobile communication technology; multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas, and large antennas; metamaterial-based lenses and antennas for improving coverage of terahertz band signals; high-dimensional spatial multiplexing technologies using OAM (Orbital Angular Momentum); and RIS (Reconfigurable Intelligent Surface), but also as a foundation for developing: full-duplex technologies for improving the frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technologies for implementing system optimization by leveraging satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions; and next-generation distributed computing technologies for implementing services with a complexity that exceeds the limits of UE operating capabilities by utilizing ultra-high-performance communication and computing resources.

[0008] As described above, with the development of wireless communication systems, there is a need for a signal transmission method for a terminal having a wake-up receiver in order to solve the problem of excessive terminal power consumption and achieve high energy efficiency. Summary of the Invention

[0009] Technical issues

[0010] The present disclosure provides a method and apparatus for activating and deactivating a wake-up receiver of a terminal having the wake-up receiver, so as to solve the problem of excessive terminal power consumption in a wireless communication system and achieve high energy efficiency.

[0011] Solution to the problem

[0012] According to one embodiment of the present invention for achieving the above technical problem, a method performed by a terminal of a wireless communication system may include the following steps: receiving an activation signal for activating a wake-up receiver from a base station based on a master radio (MR); sending a first response signal to the activation signal to the base station based on the master radio; after sending the first response signal, activating the wake-up receiver; and after sending the first response signal, switching the master radio to a sleep state.

[0013] In addition, a terminal of a wireless communication system according to an embodiment of the present invention may include: a transceiver; and a control unit, the control unit being configured to: receive an activation signal for activating a wake-up receiver from a base station based on a main radio (MR); send a first response signal to the activation signal to the base station based on the main radio; activate the wake-up receiver after sending the first response signal; and switch the main radio to a sleep state after sending the first response signal.

[0014] Advantageous Effects of the Invention

[0015] Various embodiments of the present disclosure may provide an apparatus and method capable of efficiently providing a service in a wireless communication system.

[0016] Effects obtainable from the present disclosure are not limited to the effects mentioned in the various embodiments, and other effects that are not mentioned will be clearly understood by those skilled in the art to which the present disclosure pertains from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The basic structure of the time-frequency resource domain in a wireless communication system according to various embodiments of the present disclosure is shown.

[0018] Figure 2 The time domain mapping structure and beam scanning operation of the synchronization signal according to various embodiments of the present disclosure are shown.

[0019] Figure 3 A signal flow for random access (RA) according to various embodiments of the present disclosure is shown.

[0020] Figure 4 The signal flow for a terminal to report UE capability information to a base station according to various embodiments of the present disclosure is shown.

[0021] Figure 5 Examples of state transitions between a base station and a terminal and a state of the terminal according to the state of the base station according to various embodiments of the present disclosure are shown.

[0022] Figure 6a An example for activating a wake-up receiver according to one embodiment of the present disclosure is shown.

[0023] Figure 6b Another example for activating a wake-up receiver according to one embodiment of the present disclosure is shown.

[0024] Figure 6c Another example for activating a wake-up receiver according to one embodiment of the present disclosure is shown.

[0025] Figure 7 An example for deactivating a wake-up receiver according to various embodiments of the present disclosure is shown.

[0026] Figure 8 The operation flow of activating or deactivating a wake-up receiver by a terminal according to various embodiments of the present disclosure is shown.

[0027] Figure 9 An operation flow of a base station transmitting a signal for activating or deactivating a wake-up receiver according to various embodiments of the present disclosure is illustrated.

[0028] Figure 10 is a diagram illustrating a structure of a terminal in a wireless communication system according to various embodiments of the present disclosure.

[0029] Figure 11 is a diagram illustrating a structure of a base station in a wireless communication system according to various embodiments of the present disclosure. DETAILED DESCRIPTION

[0030] The terms used in this disclosure are only used to describe specific embodiments and are not intended to limit the scope of other embodiments. Singular expressions may include plural expressions, unless the context clearly indicates otherwise. The terms used herein, including technical or scientific terms, may have the same meanings as those generally understood by those of ordinary skill in the art described in this disclosure. Among the terms used in this disclosure, the terms defined in general dictionaries may be interpreted as having the same or similar meanings as they have in the context of the relevant technology, and unless clearly defined in this disclosure, should not be interpreted as idealized or overly formal meanings. In some cases, even if a term is defined in this disclosure, it cannot be interpreted as excluding embodiments of the present disclosure.

[0031] In the various embodiments of the present disclosure described below, a hardware-based method is described as an example. However, since the various embodiments of the present disclosure include technologies using both hardware and software, the various embodiments of the present disclosure do not exclude a software-based method.

[0032] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, when describing the present disclosure, if it is determined that the detailed description of a related known function or configuration may unnecessarily obscure the gist of the present disclosure, its detailed description will be omitted. In addition, the terms described below are defined in consideration of the functions in the present disclosure, and these terms may vary according to the intentions or habits of the user or operator. Therefore, they should be defined based on the content of the entire specification.

[0033] The advantages and features of the present disclosure and methods for achieving them will become clear by referring to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, and the present embodiment is provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the present disclosure of the scope of the present disclosure, and the present disclosure is limited only by the scope of the claims. Throughout the specification, the same reference numerals represent the same components.

[0034] In this context, it should be understood that each block of the process flow diagrams, and combinations of the flow diagrams, can be performed by computer program instructions. These computer program instructions can be installed on a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that, when executed by the processor of the computer or other programmable data processing device, the instructions create means for performing the functions described in the flowchart block(s). These computer program instructions can be stored in a computer-usable or computer-readable memory, which can be directed to the computer or other programmable data processing device to implement these functions in a specific manner, such that the instructions stored in the computer-usable or computer-readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flowchart block(s). The computer program instructions can also be installed on a computer or other programmable data processing device and execute a series of operational steps on the computer or other programmable data processing device to create a computer-executable process, such that execution of the instructions on the computer or other programmable data processing device also provides the steps for performing the functions described in the flowchart block(s).

[0035] In addition, each block can represent a module, segment or portion of a code that includes one or more executable instructions for performing a specified logical function. It should also be noted that, in some optional embodiments, the functions referenced in the blocks may not occur in sequence. For example, two blocks shown one after the other may actually be executed substantially simultaneously, or the blocks may be executed in reverse order based on the functions they sometimes perform.

[0036] In this context, the term "unit" as used in this embodiment refers to a software or hardware component that can perform any role, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). However, a "unit" is not specific to software or hardware. It can be configured to reside on an addressable storage medium, or it can be configured to execute one or more processors. Therefore, in one example, a "unit" includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, programs, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within components and "units" can be combined into fewer components and "units" or further separated into additional components and "units." Furthermore, components and "units" can be implemented as one or more CPUs within a device or secure multimedia card. Furthermore, in this embodiment, a "unit" can include one or more processors.

[0037] In the following description of the present disclosure, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0038] In the following description, for the sake of convenience, terms used to identify access nodes, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to various identification information, etc. are examples. Therefore, the present disclosure is not limited to the terms described below, and other terms related to objects with equivalent technical meanings may be used.

[0039] In the following description, the terms "physical channels and signals" and "data" and "control signals" are used interchangeably. For example, the term "physical downlink shared channel" (PDSCH) refers to the physical channel over which data is transmitted, but PDSCH can also refer to data. That is, in this disclosure, the phrase "transmitting a physical channel" can be interpreted as equivalent to the phrase "transmitting data or signals via a physical channel."

[0040] In the following disclosure, upper layer 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 layer signaling can be understood as radio resource control (RRC) signaling or medium access control (MAC) control element (CE).

[0041] Furthermore, although the present disclosure uses terminology used in some communication standards (e.g., the Third Generation Partnership Project (3GPP)) to describe various embodiments, this is merely an example for explanation. The various embodiments of the present disclosure can be easily modified and applied to other communication systems. Furthermore, the term "terminal" can refer not only to cellular phones, smartphones, devices, and sensors, but also to other wireless communication devices.

[0042] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNodeB, gNB, eNodeB, eNB, Node B, base station (BS), wireless access unit, base station controller, or a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. Of course, they are not limited to the above examples. Furthermore, while various embodiments of the present disclosure are described below using LTE, LTE-A, or NR-based systems as examples, the various embodiments of the present disclosure can be applied to other communication systems with similar technical backgrounds or channel types. Furthermore, the various embodiments of the present disclosure can be applied to other communication systems with some modifications without significantly departing from the scope as judged by those skilled in the art.

[0043] In order to handle the explosive growth of mobile data traffic, initial standards have been finalized for the fifth generation (5G) system or New Radio (NR) access technology, which is the next generation communication system after LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)) and LTE-A (Long Term Evolution Advanced or Evolved Universal Terrestrial Radio Access). While existing mobile communication systems focus on existing voice / data communications, the 5G system aims to meet a variety of services and requirements, such as enhanced mobile broadband (eMBB) services for improving existing voice / data communications, ultra-reliable low-latency communications (URLLC) services, and massive machine-type communications (MTC) services that support large-scale machine-to-machine communications.

[0044] While the transmission bandwidth of a single carrier in existing LTE and LTE-A systems is limited to a maximum of 20 MHz, 5G systems aim to provide ultra-high-speed data services of up to several Gbps by utilizing much wider ultra-wide bandwidths. Therefore, 5G systems are considering ultra-high frequency bands ranging from several GHz to as high as 100 GHz, with ultra-wide bandwidth frequencies being relatively easy to secure as candidate frequencies. Furthermore, wide bandwidth frequencies for 5G systems can be secured by reallocating or allocating frequencies between frequency bands ranging from several hundred MHz to several GHz used in existing mobile communication systems.

[0045] Ultra-high frequency band radio waves have a wavelength of several millimeters and are also called millimeter waves (mmWave). However, in the ultra-high frequency band, the path loss of radio waves increases in proportion to the frequency band, so the coverage range of mobile communication systems decreases.

[0046] Beamforming technology uses multiple antennas to concentrate the radiated energy of radio waves at a predetermined target point, thereby increasing the transmission range of the radio waves. In other words, the beamwidth of the signal using beamforming becomes relatively narrow, and the radiated energy is concentrated within the narrowed beamwidth, thereby increasing the transmission range. Beamforming technology can be applied to both transmitters and receivers. In addition to increasing coverage, beamforming technology also reduces interference in areas outside the beamforming direction. For beamforming technology to operate correctly, precise measurement and feedback methods for transmit / receive beams are required. Beamforming technology can be applied to control channels or data channels, which correspond one-to-one between a predetermined terminal and a base station. In addition, beamforming technology can be applied to common signals transmitted by a base station to multiple terminals in the system, such as synchronization signals, the Physical Broadcast Channel (PBCH), control channels for transmitting system information, and data channels for increased coverage. When beamforming technology is applied to common signals, beam scanning technology, which changes the beam direction to transmit the signal, is also applied, allowing the common signals to reach terminals located anywhere within the cell.

[0047] Another requirement for 5G systems is ultra-low latency services with a transmission delay of approximately 1ms between the transmitter and receiver. One way to reduce transmission delay is to design a frame structure based on a shorter Transmission Time Interval (TTI) than LTE and LTE-A. The TTI is the basic time unit for performing scheduling, and the TTI of existing LTE and LTE-A systems is 1ms, corresponding to the length of one subframe. For example, to meet the ultra-low latency service requirements of 5G systems, a short TTI of 0.5ms, 0.25ms, or 0.125ms, shorter than that of existing LTE and LTE-A systems, is possible.

[0048] Figure 1 The basic structure of the time-frequency resource domain in the wireless communication system according to various embodiments of the present disclosure is shown. Figure 1 is a diagram showing 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.

[0049] refer to Figure 1 , Figure 1 The horizontal axis in the figure represents the time domain, while the vertical axis represents the frequency domain. The smallest transmission unit in the time domain of a wireless communication system is an Orthogonal Frequency Division Multiplexing (OFDM) symbol, where Symbols 102 may be grouped to form a time slot 106, The time slots can be grouped to form a subframe 105. The length of the subframe is 1.0 ms, and 10 subframes can be grouped 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 can be composed of a total of N BW It consists of 104 subcarriers.

[0050] In the time-frequency domain, the basic unit of resources 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) can be defined as 110 consecutive subcarriers. In the 5G system, =12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0051] In wireless communication systems, a base station may map data in RB units and schedule RBs, which typically constitute one time slot for a predetermined terminal. That is, in a 5G system, the basic time unit for scheduling may be a time slot, and the basic frequency unit for scheduling may be an RB.

[0052] The number of OFDM symbols Determined by the length of the cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, if normal CP is applied, =14, if extended CP is applied, then =12. Extended CP is applied to such a system in which the transmission distance is relatively longer than that of normal CP and the orthogonality between symbols can be maintained. In the case of normal CP, since the ratio of CP length to symbol length is maintained at a constant value, the overhead caused by CP can be kept constant regardless of the subcarrier spacing. That is, if the subcarrier spacing is small, the symbol length becomes longer, and therefore the CP length may also become longer. Conversely, if the subcarrier spacing is large, the symbol length becomes shorter, so the CP length can be reduced. The symbol length and CP length can be inversely proportional to the subcarrier spacing.

[0053] In wireless communication systems, various frame structures can be supported by adjusting the subcarrier spacing to meet various services and requirements. For example, from the perspective of the operating frequency band, a larger subcarrier spacing is beneficial for phase noise recovery in the high frequency band. From the perspective of transmission time, the larger the subcarrier spacing, the shorter the symbol length in the time domain, and therefore, the time slot length is shortened, which is beneficial in supporting ultra-low latency services such as URLLC. From the perspective of cell size, since the CP length is longer, larger cells can be supported, so smaller subcarrier spacing can support relatively larger cells. A cell is a concept indicating an area covered by a single base station in mobile communications.

[0054] Subcarrier spacing, CP length, etc. are basic information for OFDM transmission and reception. Base stations and terminals must recognize subcarrier spacing, CP length, etc. as common values to enable smooth transmission and reception.

[0055] The following [Table 1] shows the relationship between the subcarrier spacing configuration (μ), subcarrier spacing (Δf), and CP length supported in the 5G system.

[0056] [Table 1]

[0057]

[0058] The following [Table 2] shows the number of symbols per slot for each subcarrier spacing configuration (μ) for normal CP ( ), the number of time slots per frame ( ), and the number of time slots per subframe ( ).

[0059] [Table 2]

[0060]

[0061] The following [Table 3] shows the number of symbols per slot for each subcarrier spacing configuration (μ) for extended CP ( ), the number of time slots per frame ( ), and the number of time slots per subframe ( ).

[0062] [Table 3]

[0063]

[0064] In the early introduction of 5G systems, coexistence or dual-mode operation with existing LTE and / or LTE-A (hereinafter referred to as LTE / LTE-A) systems is expected. As a result, existing LTE / LTE-A can provide stable system operation to terminals, while the 5G system can function to provide improved services to terminals. Therefore, the frame structure of the 5G system needs to include at least the frame structure or necessary parameter set of LTE / LTE-A (e.g., subcarrier spacing = 15 kHz).

[0065] For example, when comparing a frame structure having a subcarrier spacing configuration of μ=0 (hereinafter referred to as frame structure A) and a frame structure having a subcarrier spacing configuration of μ=1 (hereinafter referred to as frame structure B), frame structure B shows that the subcarrier spacing and RB size are twice as large as those of frame structure A, and the slot length and symbol length are twice as small as those of frame structure A. In the case of frame structure B, two slots can form one subframe, and 20 subframes can form one frame.

[0066] Generalizing the frame structure of the 5G system provides high scalability by ensuring that a set of basic parameters such as subcarrier spacing, CP length, and slot length have an integer multiple relationship for each frame structure. A subframe with a fixed length of 1ms can be defined to represent a reference time unit that is independent of the frame structure.

[0067] The frame structure can be applied to correspond to various scenarios. From the perspective of cell size, since a longer CP length can support a larger cell, frame structure A can support a relatively larger cell than frame structure B. From the perspective of the operating frequency band, a larger subcarrier spacing is beneficial for recovering phase noise in the high frequency band, so frame structure B can support a relatively higher operating frequency than frame structure A. From the perspective of service, since a shorter time slot length as the basic time unit of scheduling is beneficial for supporting ultra-low latency services such as URLLC, frame structure B can be relatively more suitable for URLLC services than frame structure A.

[0068] Hereinafter, in the description of the present disclosure, uplink (UL) may refer to a radio link in which a terminal transmits data or a control signal to a base station, and downlink (DL) may refer to a radio link in which a base station transmits data or a control signal to a terminal.

[0069] During the initial access phase when a terminal first accesses the system, it can synchronize downlink time and frequency using a synchronization signal transmitted by a base station through a cell search and obtain a cell identifier (cell ID). The terminal can use the obtained cell ID to receive the Physical Broadcast Channel (PBCH) and obtain the Master Information Block (MIB), which serves as essential system information, from the PBCH. Furthermore, the terminal can obtain control information related to cell-common transmission and reception by receiving system information (System Information Block, SIB) transmitted by the base station. This control information can include control information related to random access (RA), control information related to paging, and common control information for various physical channels.

[0070] The synchronization signal is a signal used as a reference for cell search, and the subcarrier spacing can be applied to adapt to the channel environment, such as the phase noise of each frequency band. In the case of a data channel or a control channel, the subcarrier spacing can be adaptively applied according to the service type to support various services as described above.

[0071] Figure 2 The time domain mapping structure and beam scanning operation of the synchronization signal according to various embodiments of the present disclosure are shown.

[0072] Hereinafter, for the purpose of explaining the present disclosure, the following components may be predefined.

[0073] - Primary Synchronization Signal (PSS): It can be used as a reference for DL time / frequency synchronization and can provide some cell ID information.

[0074] - Secondary Synchronization Signal (SSS): It can be used as a reference for DL time / frequency synchronization and can provide some of the remaining cell ID information. In addition, it can be used as a reference signal for demodulation of PBCH.

[0075] - Physical Broadcast Channel (PBCH): It can provide the Master Information Block (MIB), which is the basic system information required for the transmission and reception of data channels and control channels of the terminal. Basic system information may include search space-related control information such as radio resource mapping information indicating control channels, scheduling control information for a separate data channel used to transmit system information, and information such as the System Frame Number (SFN), which is a frame unit index used as a timing reference.

[0076] -SS / PBCH block (synchronization signal / PBCH block or SSB): An SS / PBCH block may consist of N OFDM symbols and may include a combination of PSS, SSS, PBCH, etc. In a system that applies beam scanning technology, an SS / PBCH block may be the smallest unit for applying beam scanning. In a 5G system, N may be equal to 4. A base station may transmit up to L SS / PBCH blocks and may map L SS / PBCH blocks within a half-frame (0.5 ms). The L SS / PBCH blocks may be periodically repeated in units of a predetermined period P. The period P may be notified to the terminal through signaling from the base station. In the absence of separate signaling for the period P, the terminal may apply a predetermined default value.

[0077] refer to Figure 2 , Figure 2 An example of applying beam scanning to SS / PBCH block units in time is shown. Figure 2 In the case of Terminal 1 205, at time t1 201, beamforming applied to SS / PBCH block #0 allows Terminal 1 205 to receive the SS / PBCH block using a beam radiated in the direction of #d0 203. At time t2 202, Terminal 2 206 can receive the SS / PBCH block using a beam radiated in the direction of #d4 204 through beamforming applied to SS / PBCH block #4. A terminal can obtain an optimal synchronization signal using a beam radiated from a base station in the direction of the terminal. For example, Terminal 1 205 may have difficulty obtaining time / frequency synchronization and basic system information from the SS / PBCH block using a beam radiated in the direction of #d4, which is far from Terminal 1.

[0078] In addition to the initial access process, the terminal can also receive SS / PBCH blocks to determine whether the radio link quality of the current cell remains at a certain level or higher. In addition, during the handover process when the terminal moves the connection from the current cell to the adjacent cell, the terminal can receive SS / PBCH blocks of the adjacent cell to determine the radio link quality of the adjacent cell and obtain time / frequency synchronization with the adjacent cell.

[0079] After the terminal obtains the MIB and system information from the base station through the initial access process, the terminal may perform a random access process to switch the link with the base station to the connected state (or RRC_CONNECTED state). When the random access process is completed, the terminal switches to the connected state, and one-to-one communication between the base station and the terminal becomes possible. Figure 3 Describe the random access process in detail.

[0080] Figure 3A signal flow for random access (RA) according to various embodiments of the present disclosure is shown.

[0081] refer to Figure 3 In step 310, the terminal may send a random access preamble to the base station. The random access preamble, which is the first transmission message of the terminal in the random access process, may be referred to as message 1. The base station may measure the transmission delay value between the terminal and the base station based on the random access preamble and the synchronous uplink. At this time, the terminal may arbitrarily select which random access preamble to use from the set of random access preambles predefined by the system information. The initial transmission power of the random access preamble may be determined based on the path loss between the base station and the terminal measured by the terminal. In addition, the terminal may determine the transmission beam direction of the random access preamble based on the synchronization signal received from the base station and send the random access preamble.

[0082] In step 320, the base station may send an uplink transmission timing adjustment command to the terminal based on the transmission delay value measured from the random access preamble code received in step 310. The base station may send uplink resources and power control commands to be used by the terminal as scheduling information to the terminal. The scheduling information sent by the base station may include control information for the uplink transmission beam of the terminal.

[0083] If the terminal does not receive a random access response (RAR) (or Message 2) as scheduling information of Message 3 from the base station within a predetermined time in step 320, step 310 may be performed again. When step 310 is performed again, the terminal may increase the probability of the base station receiving the random access preamble by increasing the transmission power of the random access preamble by a predetermined step size and transmitting the same (e.g., power ramping).

[0084] In step 330, the terminal may transmit uplink data (Message 3) including its terminal ID to the base station using the uplink resources allocated in step 320. The terminal may transmit uplink data including the terminal ID to the base station via an uplink data channel (Physical Uplink Shared Channel, PUSCH). The transmission timing of the uplink data channel used to transmit Message 3 may follow the timing control command received from the base station in step 320. The transmission power of the uplink data channel used to transmit Message 3 may be determined based on the power control command received from the base station in step 320 and the power ramp value of the random access preamble. Message 3 may represent the first uplink data signal transmitted by the terminal to the base station after the terminal transmits the random access preamble.

[0085] In step 340, assuming that the base station has determined that the terminal has performed random access without colliding with other terminals, the base station may transmit data (Message 4) to the terminal, including the ID of the terminal that transmitted the uplink data in step 330. If the terminal receives the signal transmitted by the base station in step 340, the terminal may determine that the random access was successful. The terminal may transmit Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) information to the base station via an uplink control channel (Physical Uplink Control Channel, PUCCH) to indicate whether Message 4 was successfully received.

[0086] If the data transmitted by the terminal collides with data from another terminal and the base station fails to receive a data signal from the terminal in step 330, the base station may not transmit any more data to the terminal. If the terminal fails to receive the data transmitted from the base station in step 340 within a certain period of time, it may be determined that the random access procedure has failed, and the terminal may proceed again from step 310.

[0087] If the terminal successfully completes the random access procedure, it can be switched to a connected state, and one-to-one communication can be achieved between the base station and the terminal. The base station can receive UE capability information from the terminal in the connected state and adjust scheduling by referring to the UE capability information of the corresponding terminal. Through the UE capability information, the terminal can inform the base station whether it supports predetermined functions, the maximum allowed value of the functions supported by the terminal, etc. Therefore, the UE capability information reported by each terminal to the base station can have different values for each terminal.

[0088] For example, the terminal may report UE capability information to the base station, where the capability information includes at least one of the following control information.

[0089] -Control information related to the frequency bands supported by the terminal

[0090] -Control information related to the channel bandwidth supported by the terminal

[0091] -Control information related to the maximum modulation method supported by the terminal

[0092] -Control information related to the maximum number of beams supported by the terminal

[0093] -Control information related to the maximum number of layers supported by the terminal

[0094] -Control information related to CSI reporting supported by the terminal

[0095] -Control information about whether the terminal supports frequency hopping

[0096] -Bandwidth related control information when carrier aggregation (CA) is supported

[0097] -Control information on whether cross-carrier scheduling is supported when carrier aggregation is supported

[0098] Figure 4 The signal flow for a terminal to report UE capability information to a base station according to various embodiments of the present disclosure is shown.

[0099] refer to Figure 4 In step 410, base station 402 may send a UE capability information request message to terminal 401. In step 420, based on the base station's UE capability information request, the terminal may send UE capability information to the base station. According to one embodiment, the terminal may send UE capability information to the base station regardless of the base station's UE capability information request.

[0100] Based on the process of sending and receiving UE capability information, a terminal connected to a base station can communicate with a base station as a terminal in the RRC_CONNECTED state in a one-to-one correspondence. Conversely, an unconnected terminal can be in the RRC_IDLE state, and a terminal in the RRC_IDLE state can perform the following process.

[0101] -Execute UE-specific DRX (Discontinuous Reception) cycles configured by upper layers

[0102] - Receive paging messages from the core network

[0103] -Get system information

[0104] - Measurement operations related to neighboring cells and cell reselection

[0105] In the 5G system, a new state of the terminal called RRC_INACTIVE has been defined to reduce the energy and time consumed by the initial access of the terminal. In addition to the operations performed by the RRC_IDLE terminal, the RRC_INACTIVE terminal can also perform the following procedures:

[0106] -Store access stratum (AS) information required for cell connection

[0107] -UE-specific DRX cycle operation configured by the RRC layer

[0108] -Configure and periodically update RNA (Radio Access Network (RAN) based Notification Area) that can be utilized by the RRC layer during handover

[0109] -Monitoring RAN-based paging messages sent via Inactive Radio Network Temporary Identifier (I-RNTI)

[0110] A terminal in the RRC_CONNECTED state may change from the RRC_CONNECTED state to the RRC_INACTIVE or RRC_IDLE state by receiving an RRC release command from a base station.

[0111] A terminal in the RRC_INACTIVE or RRC_IDLE state can change from the RRC_INACTIVE or RRC_IDLE state to the RRC_CONNECTED state by performing random access and completing all random access procedures. A scheduling method is described below, by which a base station transmits downlink data to a terminal or instructs a terminal to transmit uplink data.

[0112] Downlink control information (DCI) is control information sent by a base station to a terminal via a downlink. This information may include downlink data scheduling information or uplink data scheduling information for a predetermined terminal. Typically, a 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 (Physical Downlink Control Channel (PDCCH)).

[0113] The base station may operate by applying a DCI format determined for a scheduling 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.

[0114] The base station can transmit downlink data to the terminal through the Physical Downlink Shared Channel (PDSCH), which is a physical channel used for downlink data transmission. The base station can notify the terminal of scheduling information such as the specific mapping position of the PDSCH in the time and frequency domains, the modulation method, HARQ-related control information, and power control information through DCI related to downlink data scheduling information among the DCI transmitted via the PDCCH.

[0115] The terminal can transmit uplink data to the base station via the Physical Uplink Shared Channel (PUSCH), which is a physical channel for uplink data transmission. The base station can notify the terminal of scheduling information such as the specific mapping position of the PUSCH in the time and frequency domains, the modulation method, HARQ-related control information, and power control information through DCI related to uplink data scheduling information among the DCIs transmitted via the PDCCH.

[0116] 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 as all or some of the frequency resources of the bandwidth supported by the terminal in the frequency domain. In the time domain, it may be configured as 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 upper layer signaling (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 (identification), the frequency location of the CORESET, and the symbol length of the CORESET. The information provided by the base station to the terminal to configure the CORESET may include at least some of the information included in below.

[0117] [Table 4]

[0118]

[0119] CORESET can be composed of RBs and time domain ∈{1, 2, 3} symbols. The NR PDCCH can be composed of one or more control channel elements (CCEs). A CCE can be composed of six resource element groups (REGs), and a REG can be defined as one resource element group (RB) during one OFDM symbol. Within a CORESET, REGs can be indexed in time-first order, starting with REG index 0 in the first OFDM symbol (lowest RB) from the CORESET.

[0120] Both interleaved and non-interleaved transmission methods for the PDCCH can be supported. The base station can configure the terminal through higher-layer signaling whether to perform interleaved or non-interleaved transmission for each core set. The interleaving method can be performed in units of REG bundles. A REG bundle can be defined as a set of one or more REGs. Based on whether the base station has configured interleaved or non-interleaved transmission, the terminal can determine the CCE-to-REG mapping method in the corresponding core set, as shown in Table 5 below.

[0121] [Table 5]

[0122]

[0123] The base station may notify the terminal of configuration information, such as information on symbols to which the PDCCH is mapped in a time slot, and a transmission period, through signaling.

[0124] The search space of PDCCH is described as follows. Depending on the aggregation level (AL), the number of CCEs required to send PDCCH can be 1, 2, 4, 8 or 16, 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 sent by L CCEs. The terminal performs blind decoding to detect the signal without knowing the information about the downlink control channel, and for this purpose, a search space representing a set of CCEs can be defined. The search space is a set of downlink control channel candidates consisting of CCEs that the terminal should attempt to decode at a predetermined aggregation level, and since there are various aggregation levels in which 1, 2, 4, 8 or 16 CCEs form a bundle, the terminal can have multiple search spaces. The search space set can be defined as a set of search spaces at all configured aggregation levels.

[0125] The search space can be classified into a common search space (CSS) and a UE-specific search space (USS). A specific terminal group or all terminals can search the common search space of the PDCCH in order to receive cell-common control information, such as dynamic scheduling of system information (SIB) or paging messages. For example, a terminal can receive scheduling allocation information for the PDSCH used to receive system information by searching the common search space of the PDCCH. In the case of the common search space, since a specific terminal group or all terminals must receive the PDCCH, it can be defined as a set of predetermined CCEs. The terminal can receive scheduling allocation information for a UE-specific PDSCH or PUSCH by searching the UE-specific search space of the PDCCH. The UE-specific search space can be UE-specifically defined as a function of the terminal's ID (identity) and various system parameters.

[0126] The base station may configure the PDCCH search space configuration information to the terminal through upper layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may configure the number of PDCCH candidates in each aggregation level L, the monitoring period of the search space, the monitoring timing of each symbol in the time slot of the search space, the search space type (common search space or UE-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. For example, the parameters for the PDCCH search space may include information such as the following .

[0127] [Table 6]

[0128]

[0129]

[0130]

[0131] Based on the configuration information sent to the terminal, the base station can configure one or more search space sets for the terminal. According to one embodiment, the base station can configure search space set 1 and search space set 2 for the terminal. In search space set 1, the terminal can be configured to monitor DCI format A scrambled with X-RNTI in the common search space, and in search space set 2, the terminal can be configured to monitor DCI format B scrambled with Y-RNTI in the UE-specific search space.

[0132] Based on the configuration information sent by the base station, one or more search space sets may exist in the common search space or the UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, while search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0133] In the common search space, the terminal can monitor the following combinations of DCI formats and RNTIs. Of course, according to various embodiments of the present disclosure, they are not limited to the following embodiments.

[0134] -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

[0135] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0136] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0137] -DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0138] -DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0139] In the UE-specific search space, the terminal can monitor the following combinations of DCI formats and RNTIs. Of course, according to various embodiments of the present disclosure, they are not limited to the following embodiments.

[0140] -DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0141] -DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0142] RNTI may follow the following definitions and uses. Of course, according to various embodiments of the present disclosure, they are not limited to the following examples.

[0143] -C-RNTI (Cell RNTI): used for UE-specific PDSCH or PUSCH scheduling

[0144] -TC-RNTI (Temporary Cell RNTI): used for UE-specific PDSCH scheduling

[0145] -CS-RNTI (Configured Scheduling RNTI): used for semi-statically configured UE-specific PDSCH scheduling

[0146] -RA-RNTI (Random Access RNTI): used for PDSCH scheduling during the random access phase

[0147] -P-RNTI (Paging RNTI): used for PDSCH scheduling where paging is sent

[0148] -SI-RNTI (System Information RNTI): used for PDSCH scheduling where system information is transmitted

[0149] -INT-RNTI (Interrupt RNTI): Used to indicate whether puncturing has been applied to PDSCH

[0150] -TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): used to indicate power control commands to PUSCH

[0151] -TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): used to indicate power control commands to PUCCH

[0152] -TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): used to indicate power control commands to SRS

[0153] The DCI format described above may follow the definition shown in the following [Table 7].

[0154] [Table 7]

[0155]

[0156] The search space of aggregation level L in CORESET p and the search space set s can be expressed as Equation 1 below.

[0157] [Equation 1]

[0158]

[0159] -L: aggregation level

[0160] -nCI: carrier index

[0161] -NCCE,p: The total number of CCEs in control resource set p

[0162] -nμs,f: time slot index

[0163] -M(L)p,s,max: number of PDCCH candidates for aggregation level L

[0164] -msnCI = 0, ..., M(L)p,s,max -1: Index of PDCCH candidates for aggregation level L

[0165] -i = 0, ..., L-1

[0166] -

[0167] -

[0168] -nRNTI: terminal identifier

[0169] In the case of a common search space, the value Can correspond to 0.

[0170] In case of UE-specific search space, this value It may correspond to a value that changes according to the terminal ID (C-RNTI or an ID configured for the terminal by the base station) and the time index.

[0171] As mentioned above, to enable 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 several GHz can be supported. Ultra-wide bandwidth signal transmission and reception can be supported via a single component carrier (CC) or through carrier aggregation (CA) technology that combines multiple component carriers. When a mobile communications service provider cannot secure frequencies with sufficient bandwidth to provide ultra-high-speed data services using a single component carrier, carrier aggregation technology can increase the total frequency bandwidth by combining component carriers with relatively small bandwidths, thereby enabling ultra-high-speed data services.

[0172] 5G systems are designed and developed for a variety of use cases. In addition to standby time, reliability, and availability, terminal energy efficiency is also crucial for 5G. Current 5G terminals require weekly or daily charging, depending on individual usage, and typically consume tens of milliwatts in the RRC_IDLE / RRC_INACTIVE states and hundreds of milliwatts in the RRC_CONNECTED state. Designing for extended battery life may be essential for improving energy efficiency and enhancing the user experience. Energy efficiency may be even more important for terminals that lack a continuous energy source, such as those using small rechargeable batteries and single coin cells. In 5G use cases, sensors and actuators are widely deployed for monitoring, measurement, and charging, and batteries are typically non-rechargeable and require a battery life of at least several years. Wearables may also include smartwatches, rings, electronic health devices, and medical monitoring equipment, which typically struggle to last for more than one to two weeks depending on usage.

[0173] As an example of commercial 5G terminals, their power consumption depends on the length of their configured wake-up cycles (e.g., paging cycles), and they can use long extended discontinuous reception (eDRX) cycles to meet battery life requirements. However, the eDRX approach is not suitable for low-latency services because it maintains long battery life at the expense of high latency. For example, in a fire detection and suppression use case, within 1-2 seconds of a fire being detected by a sensor, fire panels may need to be closed and sprinklers may need to be activated by an actuator. In this case, latency can be critical, and the long eDRX cycles of the past are unsuitable because they fail to meet latency requirements.

[0174] Figure 5 The following illustrates an example of a state transition between a base station and a terminal and a state of a terminal according to the state of the base station according to various embodiments of the present disclosure. Figure 5 The state transition of the base station and the terminal for solving the above problems is shown.

[0175] Current commercial 5G terminals may need to wake up periodically once per eDRX cycle, which can dominate power consumption during periods without signaling or data traffic. If the terminal can wake up only when triggered (e.g., by paging), power consumption can be significantly reduced. Breakthrough power reduction can be achieved by using a wake-up signal (WUS) to trigger the primary radio (e.g., an existing NR radio or a primary MR radio) (e.g., Figure 5 As shown), and a separate receiver, the Wake-Up Receiver (WUR or Lower Power Receiver LR), which can monitor the WUS at ultra-low power, is used to turn on the main radio only when data transmission and reception are required.

[0176] According to one embodiment, in step 501 , the base station may send a WUS corresponding to ON or OFF to the terminal.

[0177] In step 502, the terminal may use the WUR to receive the WUS.

[0178] In step 503 , the terminal may trigger the primary radio to be in the off or on state based on the information that the received signal corresponds to on or off.

[0179] In step 504, the terminal may configure the primary radio to be awake or shut down. According to one embodiment, it may be configured to be in a deep sleep (DS) or ultra deep sleep (UDS) state instead of being completely shut down.

[0180] According to one embodiment, when a data service to be sent from the base station to the terminal occurs 505 and the WUS sent by the base station in step 501 is a signal corresponding to turning on, the main radio can be turned on and the terminal can receive data 506 sent by the base station through the main radio instead of the WUR.

[0181] According to one embodiment, the power consumption for monitoring WUS depends on the hardware modules of WUR for WUS design, signal detection and processing, so that the gain will be maximized for power-sensitive and small form factor devices, including IoT use cases (e.g., industrial sensors, controllers) and wearables.

[0182] According to one embodiment, the terminal including the wake-up receiver may report to the base station that it has the capability to wake up the primary radio using the wake-up receiver, or may report capability information that the terminal includes the wake-up receiver to the base station.

[0183] According to one embodiment, the terminal can also Figure 4 The UE capability information reporting procedure reports capability information about the wake-up receiver to the base station.

[0184] According to one embodiment, Figure 3 During the random access process of the UE, the terminal can report the capability information of the wake-up receiver to the base station through at least one step of the random access preamble or the uplink data channel. According to one embodiment, a set of random access preambles that can be sent by the terminal including the wake-up receiver can be sent to the terminal as system information. Figure 3In step 310 of the random access procedure, the terminal may select a random access preamble from the set received by the terminal and transmit the random access preamble based on the selected random access preamble. According to one embodiment, after reporting the capability information about the wake-up receiver to the base station, the terminal may receive information indicating whether to use the wake-up receiver from the base station through upper layer signaling or a physical signal.

[0185] According to one embodiment, when a base station supports a terminal that includes a wake-up receiver (for example, 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. According to one embodiment, the base station may transmit a signal indicating whether the terminal should use the wake-up receiver or configuration information to receive the wake-up signal. According to one embodiment, the base station may transmit to the terminal at least one of instruction information activating the terminal's reception of the wake-up signal or instruction information notifying the base station to transmit the wake-up signal. Starting from the timeslot in which the signal was received, the terminal may turn off the primary radio and turn on the wake-up receiver to monitor for wake-up signals after a timeslot defined in the standard or configured by the base station. According to one embodiment, the terminal may transmit to the base station at least one of feedback indicating that it received a signal indicating whether to use the wake-up receiver before turning off the primary radio, or feedback indicating that the primary radio was turned off and the wake-up receiver was turned on.

[0186] According to one embodiment, if a base station does not support a terminal with a wake-up receiver, the base station may receive information about the wake-up receiver's capabilities from the terminal and then transmit a signal to the terminal indicating that the wake-up receiver is unavailable. The terminal may transmit feedback to the base station indicating that it has received the signal indicating that the wake-up receiver is unavailable. According to one embodiment, the terminal may operate according to the parameters of the existing power saving method configured by the base station by using an existing power saving method (such as C-DRX or I-DRX for paging).

[0187] According to various embodiments of the present disclosure, after a terminal with a wake-up receiver reports its capabilities and determines whether it supports (or allows) the wake-up receiver from a base station, the terminal's wake-up receiver can then perform operations to turn the terminal's primary radio on and off by receiving a wake-up signal. According to one embodiment, it goes without saying that the terminal can independently perform operations to turn the primary radio on / off and report its capabilities, or to determine whether it supports the wake-up receiver from the base station. For example, even when the terminal's capabilities are not reported and the permission procedure is not performed, the base station can send a signal to the terminal indicating whether to use the wake-up receiver or configuration information for receiving wake-up signals. Thus, among terminals receiving signals from the base station, terminals with a wake-up receiver can perform operations to turn the primary radio on / off using the wake-up receiver. According to one embodiment, after the terminal's capabilities are reported and the base station has authorized the terminal, the operation to turn the primary radio on / off using the wake-up receiver can be applied to all terminals within a 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 terminal capability reporting operation and the base station authorization process are not performed, the operation of turning on / off the primary radio by waking up the receiver can be applied to RRC_IDLE / RRC_INACTIVE terminals camped in a cell supported by the base station. In addition, various embodiments of the present disclosure may include at least one of all operations, some operations, or a combination of some operations among the various operations of the terminal and the base station including waking up the receiver as described below.

[0188] Hereinafter, according to various embodiments of the present disclosure, the operation of turning on and off the main radio of a terminal having a wake-up receiver is described. Various embodiments of the present disclosure may include at least one of all operations, some operations, or a combination of some operations among the various operations of a terminal and a base station including a wake-up receiver described below.

[0189] According to one embodiment, when a terminal's primary radio is turned on, the terminal can receive downlink signals (or data) from a base station via the primary radio. According to various embodiments of the present disclosure, "the primary radio being turned on" can be expressed as "turning on" or "activating" the primary radio, and without limitation, can be represented by similar or substantially equivalent meanings. According to one embodiment, "activating the primary radio" can refer to turning on or activating specific components of the primary radio (e.g., radio frequency (RF) or baseband (BB)), or can be defined by a standard (e.g., a 3GPP TS document). However, according to various embodiments of the present disclosure, without limitation, "activating the primary radio" can include performing operations using parameters or parameters having equivalent or substantially similar content. Alternatively, it can include the primary radio performing reception operations for specific channels or signals (e.g., SS / PBCH blocks containing synchronization signals or PDCCH blocks containing downlink control channels), as defined in the 3GPP TS documents.

[0190] According to one embodiment, when a terminal's primary radio is turned off, the terminal may be considered to be in a dormant period, or may not receive downlink signals (or data) from a base station. According to various embodiments of the present disclosure, "turning off" the primary radio may be expressed as "switching off" or "deactivating" the primary radio, and without limitation, may be expressed by similar or substantially equivalent meanings. According to one embodiment, deactivating the primary radio may refer to turning off or deactivating specific components of the primary radio (e.g., radio frequency (RF) or baseband (BB)), or may be defined by a standard (e.g., 3GPP TS). However, according to various embodiments of the present disclosure, without limitation, deactivating the primary radio may include operating via parameters or parameters with equivalent or substantially similar content. Alternatively, it may include the primary radio no longer receiving specific channels or signals (e.g., SS / PBCH blocks containing synchronization signals or PDCCH blocks containing downlink control channels), as defined in 3GPP TS.

[0191] According to various embodiments of the present invention, when a base station has a channel or signal to be sent to a terminal, the base station may send a wake-up signal to the terminal. The terminal or the wake-up receiver may receive the wake-up signal to turn on the main radio. According to one embodiment, the operation 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 the information for waking up the main radio may be mapped to the K information bits. For example, when the information bit included in the wake-up signal is 1 bit of information, "1" may indicate turning on, and "0" may indicate turning off.

[0192] According to one embodiment, from the perspective of the base station, it is possible to predetermine whether the wake-up signal will be sent at a certain point before the channel or signal is sent. From the perspective of the terminal, it is also possible to predetermine whether the wake-up signal can be received at a certain point before the channel or signal is received.

[0193] According to one embodiment, a terminal may transmit information regarding the required time offset between the transmission of a wake-up signal and a channel / signal to a base station, and the base station may configure the time offset between the transmission of the wake-up signal and the channel / signal to the terminal based on the received information. According to one embodiment, the terminal may transmit information regarding the required time offset between the transmission of the wake-up signal and the channel / signal to the base station through a UE capability information reporting procedure, or may transmit information to the base station through a random access preamble or an uplink data channel during a random access procedure. Of course, but not limited to this, the terminal may transmit information regarding the time offset to the base station through higher layer signals or various other signals. The base station may configure information regarding the time offset between the transmission of the wake-up signal and the channel / signal to the terminal through a downlink data channel in a random access response (e.g., Message 2) or a random access contention resolution (e.g., Message 4) during a random access procedure. Of course, but not limited to this, the base station may configure information regarding the time offset to the terminal through higher layer signals or various other signals.

[0194] According to various embodiments of the present disclosure, when a base station has a periodic channel or a periodic signal to be sent to a terminal, instead of the base station sending a wake-up signal every time there is a channel or signal to be sent, the terminal or the wake-up receiver can turn on the main radio according to the periodic channel or the periodic signal configuration information configured by the base station.

[0195] According to one embodiment, the base station may transmit a wake-up signal only during the first transmission of a periodic channel or a periodic signal, and may omit the transmission of the wake-up signal during subsequent repeated transmissions of the channel or signal. In this case, the terminal or the wake-up receiver may turn on the primary radio based on the periodic signal configured by the base station or the period according to the configuration information of the periodic channel.

[0196] According to one embodiment, the type of periodic channel or periodic signal transmitted and received between the base station and the terminal may be predefined. According to one embodiment, the type of periodic channel or periodic signal may be configured by the base station. The base station may configure the type of periodic channel or periodic signal to the terminal via the downlink data channel of a random access response (e.g., Message 2) or a random access contention resolution (e.g., Message 4), or may configure the type of periodic channel or periodic signal to the terminal via an upper layer signal or another upper layer signal indicating configuration information for receiving a wake-up signal.

[0197] According to various embodiments of the present disclosure, when the terminal has a channel or signal to be transmitted to the 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 the wake-up receiver may turn on the primary radio regardless of the wake-up signal transmitted by the base station.

[0198] According to one embodiment, the wake-up receiver may receive a wake-up signal for uplink transmission or L1 / L3-based measurement transmitted by the terminal to the base station, and may not apply an operation of turning on and off a main radio of the terminal.

[0199] According to one embodiment, the type of uplink channel, uplink signal, or L1 / L3-based measurement for a terminal, which is transmitted independently of the wake-up signal reception operation, may be predefined. According to one embodiment, the type of uplink channel, uplink signal, or L1 / L3-based measurement may be configured by the base station. The base station may configure the type of uplink channel, uplink signal, or L1 / L3-based measurement to the terminal via a random access response (e.g., message 2) or random access contention resolution (e.g., message 4) downlink data channel, or may configure the type of uplink channel, uplink signal, or L1 / L3-based measurement to the terminal via an upper layer signal or another upper layer signal indicating configuration information for receiving the wake-up signal.

[0200] Hereinafter, according to various embodiments of the present disclosure, an operation for turning off the primary radio when the primary radio is turned on is described. According to one embodiment, the operation for waking up the primary radio when the primary radio is turned on 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.

[0201] According to various embodiments of the present invention, when there is no channel or signal to be sent to the terminal, the base station may send a sleep signal to the terminal. The terminal or the wake-up receiver may receive the sleep signal to turn off the main radio. According to one embodiment, the operation 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 sequence separate from the wake-up signal. According to one embodiment, the sleep signal may include information in which information for waking up the main radio is mapped from 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.

[0202] According to various embodiments of the present disclosure, a terminal's primary radio may be turned off when a configured condition is met. According to one embodiment, the condition for turning off the primary radio may be when the primary radio is unable to detect or decode a downlink control channel, a specific channel, or a signal during a configured interval. According to one embodiment, a base station may configure configuration information (e.g., including an interval and specific channel or signal) to determine whether to turn off the primary radio to the terminal via an upper layer signal or another upper layer signal indicating configuration information for receiving a wake-up signal.

[0203] According to various embodiments of the present disclosure, a terminal's primary radio can always be turned off after receiving a channel or signal. According to one embodiment, the primary radio can be turned off after a wake-up receiver receives a wake-up signal from a base station and the primary radio is turned on to receive a channel or signal. According to one embodiment, the time required to turn off the primary radio after channel or signal reception is complete can be predefined. According to one embodiment, the terminal can send information about the time required to turn off the primary radio to the base station, and the base station can configure the required time for the terminal based on the received information. According to one embodiment, the information about the required time sent by the terminal can be sent to the base station through the UE capability information reporting procedure. According to one embodiment, the information about the required time sent by the terminal can be sent to the base station through a random access preamble or an uplink data channel. Of course, these are not limited to these, and the terminal can also send the information about the required time to the base station through higher layer signals. The base station can configure the information about the required time to be sent to the terminal through the downlink data channel of the random access response (e.g., Message 2) or the random access contention resolution (e.g., Message 4). Of course, without limitation, the base station can also configure the information about the required time to the terminal through higher layer signals.

[0204] Hereinafter, according to various embodiments of the present disclosure, when a terminal or a primary radio of a terminal is in the RRC_CONNECTED state, the terminal may be configured with C-DRX (Connected Mode DRX) so that the primary radio can wake up in each DRX cycle to perform PDCCH reception. According to one embodiment, when the terminal or the primary radio of the terminal is in the RRC_CONNECTED state, the terminal (or the primary radio) may be configured to receive a signal indicating whether the terminal should receive the PDCCH in the next DRX cycle.

[0205] According to one embodiment, when the primary radio is in the RRC_IDLE / RRC_INACTIVE state, the terminal may be configured with I-DRX (idle mode DRX) so that the primary radio wakes up in each paging cycle to receive a paging PDCCH. According to one embodiment, when the terminal or the terminal's primary radio is in the RRC_CONNECTED state, the terminal (or primary radio) may be configured to receive a signal indicating to the terminal whether to receive a paging PDCCH in the next paging cycle.

[0206] Hereinafter, according to various embodiments of the present disclosure, an embodiment of a process for a terminal operating as a wake-up receiver is provided when an operation indicating on / off based on reception of a wake-up signal by the wake-up receiver and the primary radio and an operation according to the configuration of C-DRX or I-DRX are mixed. According to one embodiment, the operation of the terminal or the primary radio of the terminal related to the RRC CONNECTED / IDLE / INACTIVE state may be performed in conjunction with the various operations according to various embodiments of the present disclosure, or may be performed separately and may not be an essential component.

[0207] According to various embodiments of the present disclosure, when a terminal having a wake-up receiver performs an operation of turning on and off the terminal's primary radio by receiving a wake-up signal, the terminal may not perform configuration and operation according to the configuration of C-DRX or I-DRX. In this case, instead of performing configuration and operation according to the configuration of C-DRX or I-DRX, the terminal may turn on the terminal's primary radio only when it receives a wake-up signal, so as to wake up the primary radio, and may receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH), wherein the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) are defined or configured to be received in C-DRX or I-DRX, respectively.

[0208] According to one embodiment, when a terminal or a primary radio of the terminal is in the RRC_CONNECTED state and the operation performed by the wake-up receiver is configured or activated by the base station, if the wake-up receiver receives a wake-up signal to wake up the primary radio, the terminal may turn on the primary radio and may also perform operations related to C-DRX configured by the base station (e.g., the primary radio receives a PDCCH within the drx_onDurationTimer of each DRX cycle). According to one embodiment, the terminal (or primary radio) may not perform operations configured to receive a signal (e.g., DCI format 2_6) indicating whether the terminal will receive a PDCCH in the next DRX cycle. According to one embodiment, when a terminal or a primary radio of the terminal is in the RRC_IDLE / INACTIVE state and the operation performed by the wake-up receiver is configured or activated by the base station, if the wake-up receiver receives a wake-up signal to wake up the primary radio, the terminal may turn on the primary radio and may also perform operations related to I-DRX configured by the base station (e.g., the primary radio wakes up in each paging cycle to receive a paging PDCCH). According to one embodiment, the terminal (or master radio) may not perform an operation configured to receive a signal (eg, DCI format 2_7) indicating to the terminal whether to receive a paging PDCCH in the next paging cycle.

[0209] According to one embodiment, the terminal may perform an operation for waking up the primary radio according to the wake-up receiver and the wake-up signal according to various embodiments of the present disclosure, and an operation for shutting down the primary radio, instead of an operation according to a configuration related to C-DRX or I-DRX. In the event that the operation performed by the wake-up receiver is deactivated by the base station, the operation related to C-DRX or I-DRX configured by the base station may be performed again.

[0210] According to various embodiments of the present disclosure, when an operation performed by a wake-up receiver of a terminal is configured or activated by a base station, and the terminal or the wake-up receiver receives a wake-up signal to turn on the main radio, the terminal may be transitioned to an RRC_CONNECTED state or an RRC_IDLE or RRC_INACTIVE state. According to one embodiment, whether the terminal can be transitioned to a certain state may be predetermined, or may be determined by an upper layer signal for configuring the wake-up receiver operation or a separate upper layer signal from the base station. According to one embodiment, which state the terminal can transition to may be predetermined, or may be determined by an upper layer signal for configuring the wake-up receiver operation or a separate upper layer signal from the base station.

[0211] According to one embodiment, as an example of a case where information regarding the terminal's transition (information regarding the RRC state the primary radio will be in when the primary radio is turned on by a wake-up signal) is predetermined, the state of the primary radio may follow a state in which the primary radio was recently turned on and then turned off immediately before the current turn-on time. According to another embodiment, as a case where information regarding the terminal's transition is predetermined, the state of the primary radio may not be affected by whether wake-up receiver operation is configured and activated. For example, the state of the terminal's primary radio may be determined solely by an upper layer signal indicating at least one of RRC_CONNECTED, RRC_IDLE, or RRC_INACTIVE, and the terminal may determine that the state of the primary radio has not changed based on whether wake-up receiver operation is configured and activated.

[0212] According to one embodiment, the wake-up signal may include K information bits, and information about whether the primary radio enters at least one of an RRC_CONNECTED state, an RRC_IDLE state, or an RRC_INACTIVE state may be mapped to the K information bits.

[0213] According to one embodiment, when the terminal or the primary radio of the terminal is RRC_CONNECTED based on the determined terminal state, the primary radio may be awakened by C-DRX configured by the base station and receive the PDCCH of each DRX cycle, or the terminal (or the primary radio) may be configured by the base station to receive a signal indicating whether the terminal will receive the PDCCH in the next DRX cycle. According to one embodiment, when the operation for shutting down the primary radio according to various embodiments is performed while the terminal is receiving the PDCCH (for example, during a period of receiving the PDCCH), the terminal may perform the procedure for shutting down the primary radio as a priority.

[0214] According to one embodiment, when a terminal or its primary radio is in RRC_IDLE / INACTIVE mode, the primary radio may wake up at each paging cycle and receive a paging PDCCH using I-DRX configured by the base station. The base station may also configure the terminal (or primary radio) to receive a signal indicating whether the terminal will receive a paging PDCCH in the next paging cycle. When performing operations for shutting down the primary radio according to various embodiments while the terminal receives a paging PDCCH (e.g., during a period in which the paging PDCCH is received), the terminal may prioritize shutting down the primary radio.

[0215] 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 operation may be the terminal or the main radio.

[0216] In the case where the base station transmits instruction information to activate the terminal to receive a wake-up signal, and the base station and the terminal have different understandings of when the terminal should detect the wake-up signal from the wake-up receiver and when the main radio can be turned off, even if the base station transmits a wake-up signal receivable from the wake-up receiver and a downlink channel / signal receivable from the main radio to the terminal, the terminal may miss the signal and the channel. Figures 6a to 6c , Figure 7 、 Figure 8 and Figure 9 Embodiments for solving the above-mentioned problems are described.

[0217] The following describes, according to various embodiments of the present disclosure, a process for putting the primary radio into sleep mode until a wake-up signal is received and activating a wake-up receiver to detect the wake-up signal. Here, a process for a base station and a terminal equipped with a wake-up receiver to transmit and receive a signal indicating activation and a corresponding response signal, as well as possible solutions in the event of signal loss, is described. The signal indicating activation may be transmitted via wake-up reception configuration information, i.e., a signal indicating whether to use the wake-up receiver or configuration information for receiving a wake-up signal, or the terminal may determine the wake-up reception configuration information as the signal indicating activation. Alternatively, it may be transmitted separately from the wake-up reception configuration information.

[0218] According to another embodiment, a process is described for turning on the primary radio to transmit and receive signals without relying on a wake-up receiver, and for deactivating the wake-up receiver so that it no longer detects wake-up signals. In this case, a process is described for a base station and a terminal equipped with a wake-up receiver to transmit and receive a signal indicating deactivation and a corresponding response signal, as well as possible solutions in the event of signal loss. The signal indicating deactivation can be sent via wake-up reception deconfiguration information (i.e., a signal for deconfiguring whether the wake-up receiver is used or for deconfiguring the reception of wake-up signals), or the wake-up reception deconfiguration information can be determined by the terminal as a signal indicating deactivation. Alternatively, it can be sent separately from the wake-up reception deconfiguration information.

[0219] When describing the following embodiments, it should be noted that operations or processes represented as being performed by a main radio or wake-up receiver for a terminal equipped with a wake-up receiver (i.e., a terminal with wake-up reception capability) may also be understood as being performed by a terminal equipped with a wake-up receiver (i.e., a terminal with wake-up reception capability).

[0220] First, it describes putting the primary radio to sleep until Figures 6a to 6c The process of receiving a wake-up signal and activating a wake-up receiver to detect the wake-up signal.

[0221] Figures 6a to 6c An example of activating a wake-up receiver according to various embodiments of the present disclosure is shown. The following embodiments are applicable when the terminal is in the RRC CONNECTED state, and a method applicable when the terminal is in the RRC IDLE or RRC INACTIVE state will be described in addition.

[0222] In the first embodiment, terminal 600 is equipped with a wake-up receiver 602 and a primary radio 601. It is assumed that the wake-up-related capability information of terminal 600 and configuration information for receiving a wake-up signal from a base station have been exchanged using the method described above. In 603, primary radio 601 of terminal 600 is turned on, and in 604, the wake-up receiver is turned off in a deactivated state. The base station may transmit a signal 610 to activate the wake-up receiver, and terminal 600 may transmit a response 611 to signal 610 a certain period of time 612 after receiving signal 610. After transmitting response 611, terminal 600 may turn off primary radio 605 and activate the wake-up receiver in an on state 606 to begin searching for a wake-up signal after a certain period of time 613. The times corresponding to 612 and 613 may be defined in the standard or may be configured to the terminal via higher-layer signals. Specifically, the time for turning off the main radio and the time for activating the wake-up receiver in the on state in 613 can be separately defined in the standard, or only one of the two can be defined in the standard, or one of the two can be configured to the terminal through an upper layer signal.

[0223] When the terminal (or primary radio) is in RRC_IDLE or RRC_INACTIVE state, it may receive a signal 610 to activate the wake-up receiver without sending a response 611, and after a certain period of time 612, the primary radio is turned off 605, the wake-up receiver is turned on and activated 606, and the search for the wake-up signal may begin.

[0224] In the first embodiment, if the base station does not receive a response 611, the base station may retransmit a signal 610 to the terminal's primary radio to reactivate the wake-up receiver, or may directly transmit a downlink signal to the terminal's primary radio instead of waking up the terminal's primary radio by transmitting a wake-up signal. In this case, there is a risk that the terminal (or the terminal's primary radio) may miss the downlink signal transmitted by the base station because, in the first embodiment, the terminal's primary radio is already in the off state 605. A second embodiment for resolving this issue will be described.

[0225] In the second embodiment, the process until the response 611 is transmitted is the same as in the first embodiment. However, after transmitting the response 611, after a certain period of time 613, the terminal 600 may begin searching for a wake-up signal by activating the wake-up receiver in the on state 606 without turning off the primary radio, and may receive a first wake-up signal 620. The terminal 600 may interpret the wake-up signal as feedback that the base station has correctly received the response 611, and may turn off the primary radio after a certain period of time after receiving the wake-up signal. If no wake-up signal is received within a certain period of time after the wake-up receiver is turned on, the primary radio may remain in the on state without turning off. Furthermore, the wake-up receiver may be changed to a deactivated off state, and the process may be initialized to receive the activation signal 610 again. The time period from transmitting the response 611 to receiving the first wake-up signal 620 may be defined in the standard or may be configured to the terminal via higher-layer signaling. In the second embodiment, if the base station transmits the first wake-up signal but the terminal does not receive it, the terminal may retransmit the response 611 from the primary radio or attempt to receive a downlink signal or activation signal 610 directly from the primary radio. Since the base station will re-receive the response 611 and re-transmit the wake-up signal 620, the terminal can re-receive the wake-up signal 620 transmitted by the base station. In this case, the terminal may need to re-transmit the response 611 from the primary radio. To account for this situation, after receiving the second wake-up signal (a wake-up signal transmitted to the wake-up receiver to turn on the primary radio to receive a general downlink signal), the terminal can turn off the primary radio after receiving the general downlink signal.

[0226] In the third embodiment, the process until the first wake-up signal 620 is received is the same as in the second embodiment. However, after receiving the wake-up signal 620, a response 631 to the wake-up signal 620 is transmitted after a certain period of time 614, so that the base station can determine that the terminal has successfully received the wake-up signal 620. After transmitting the response 631, the terminal can ultimately turn off the primary radio after a certain period of time 615. If the base station does not receive the response 631, the first wake-up signal 620 can be retransmitted, and the terminal can transmit the response 631 again after receiving the first wake-up signal 620. The certain period of time from receiving the first wake-up signal to transmitting the response 631 and the certain period of time from transmitting the response 631 to turning off the primary radio can be defined in the standard or can be configured to the terminal through a higher layer signal.

[0227] In the above embodiment, the first wake-up signal may include information necessary to activate the wake-up receiver and may be configured to have a sequence different from other general wake-up signals used to turn on the primary radio to receive general downlink signals. In this case, when the terminal receives the first wake-up signal or another general wake-up signal from the wake-up receiver, the terminal may determine that the primary radio is to be awakened and may turn on the primary radio. When the first wake-up signal is received, a response 631 may be sent from the terminal or the primary radio of the terminal, and when a general wake-up signal different from the first wake-up signal is received, a general downlink signal may be received from the terminal or the primary radio of the terminal.

[0228] In each of the above-described embodiments, some signals may be omitted, or the order of the signals may be changed.

[0229] Next, in Figure 7 The procedure for disabling the wake-up receiver is described in

[15] so that it no longer detects the wake-up signal and the primary radio can continue its normal terminal operations without relying on the wake-up receiver.

[0230] Figure 7 An example of deactivating a wake-up receiver according to various embodiments of the present disclosure is shown. The following embodiments are applicable when the terminal is in the RRC CONNECTED state, and a method applicable when the terminal is in the RRC IDLE or RRC INACTIVE state will be described in addition.

[0231] In the first embodiment, terminal 700 is equipped with a wake-up receiver 702 and a primary radio 701. It is assumed that the method described above has been used to exchange wake-up capability information of terminal 700 and configuration information for receiving a wake-up signal from a base station. In 703, primary radio 701 of terminal 700 may be in an on state (or in a dormant or off state), and in 704, the wake-up receiver may be in an on or off state when activated. In the first embodiment, a deactivation signal 710 is received by the primary radio. First, the base station transmits signal 710 to deactivate the wake-up receiver. If primary radio 701 is in a dormant or off state, the base station may transmit a wake-up signal to trigger primary radio 701 to turn on, and then transmit signal 710 to deactivate the wake-up receiver. Terminal 700 may transmit a response 711 to signal 710 a certain period of time 712 after receiving signal 710 via the primary radio. After sending the response 711, the terminal 700 may maintain the main radio in the on state 703 and deactivate the wake-up receiver in the off state 706 so as not to search for the wake-up signal after a certain period of time 713. As another example, the terminal 700 may deactivate the wake-up receiver in the off state after a certain period of time 712 after receiving the signal 710, and thereafter send the response 711 to the signal 710. In this case, the certain period of time 712 may be defined as the time from when the deactivation instruction is received until the wake-up receiver is deactivated.

[0232] In the case where the terminal misses the deactivation signal 710, the terminal may not transmit a response 711 to the deactivation signal 710. In this case, since the base station may not receive the response 711, the base station may retransmit the deactivation signal 710 again, and the terminal may re-receive the deactivation signal 710. In the case where the base station misses the response 711, the base station determines that the terminal has not received the deactivation signal 710 and may retransmit the deactivation signal 710. In this case, the terminal may re-receive the deactivation signal 710 and re-send the response 711 to the base station.

[0233] The times corresponding to the above 712 and 713 may be defined in the standard or may be configured to the terminal through a higher layer signal.

[0234] When the terminal (or primary radio) is in the RRC_IDLE or RRC_INACTIVE state, a signal 710 for deactivating the wake-up receiver may be received without sending a response 711, and after a certain period of time 712, the wake-up receiver may be deactivated in the off state 706, thereby stopping the search for the wake-up signal.

[0235] In a second embodiment, terminal 700 is equipped with a wake-up receiver 702 and a primary radio 701. It is assumed that the method described above has been used to exchange wake-up capability information of terminal 700 and configuration information for receiving wake-up signals from a base station. In 705, primary radio 701 of terminal 700 may be in a sleep or off state, and in 704, the wake-up receiver may be turned on and activated. In the second embodiment, a deactivation signal 720 is received by the wake-up receiver. First, the base station transmits a signal 720 via a wake-up signal to deactivate the wake-up receiver. In this case, the wake-up signal may include deactivation information. After receiving signal 720 via wake-up receiver 702, terminal 700 may trigger the primary radio to turn on. After a certain period of time 712, the primary radio may transmit a response 711 to signal 720. After transmitting response 711, terminal 700 may maintain the primary radio in the on state 703 and deactivate the wake-up receiver 706, which is about to be turned off, to prevent further searches for wake-up signals. As another example, terminal 700 may deactivate the wake-up receiver to be turned off after a certain period of time 712 after receiving signal 720, and thereafter transmit a response 711 to signal 720. In this case, certain period of time 712 may be defined as the time from receiving the deactivation instruction to deactivating the wake-up receiver. The times corresponding to 712 and 713 may be defined in the standard or may be configured to the terminal via an upper layer signal.

[0236] When the terminal (or primary radio) is in the RRC_IDLE or RRC_INACTIVE state, a signal 720 for deactivating the wake-up receiver may be received without sending a response 711, and after a certain period of time 712, the wake-up receiver may be deactivated in the off state 706, thereby stopping the search for the wake-up signal.

[0237] When the terminal (or master radio) is in the RRC_IDLE or RRC_INACTIVE state, a signal for activating or deactivating the wake-up receiver may be transmitted as an upper layer signal including system information, or may be included in a signal indicating paging.

[0238] When the terminal changes from the RRC_IDLE or RRC_INACTIVE state to the RRC_CONNECTED state, or from the RRC_CONNECTED state to the RRC_IDLE or RRC_INACTIVE state, by a signal from the base station, it can be determined that the activation instruction reception of the wake-up receiver in the previous state is no longer valid. For example, even if the wake-up receiver was activated in the previous RRC_IDLE or RRC_INACTIVE state, the terminal can determine that the activation of the wake-up receiver is inactive until the wake-up receiver activation instruction is received from the base station in the changed RRC_CONNECTED state, turn off the wake-up receiver to the inactive state, and change the main radio to the on state to perform data transmission and reception through the main radio.

[0239] In another embodiment, when the terminal changes from the RRC_IDLE or RRC_INACTIVE state to the RRC_CONNECTED state, or from the RRC_CONNECTED state to the RRC_IDLE or RRC_INACTIVE state, via a signal from the base station, it may be determined that the activation instruction received by the wake-up receiver in the previous state is still valid. For example, if the wake-up receiver was in the activated state in the previous RRC CONNECTED state, even if there is no separate activation instruction for the wake-up receiver from the base station in the changed RRC IDLE or RRC INACTIVE state, the terminal may determine to maintain the activation state of the wake-up receiver, maintain the wake-up receiver in the activated state, and change or maintain the main radio in the sleep or off state to search for a wake-up signal through the wake-up receiver. In this case, the base station may change the activation / deactivation of the wake-up receiver in the previous RRC state of the terminal in advance based on the activation / deactivation of the wake-up receiver in the changed RRC state of the terminal.

[0240] Figure 8 The operation flow of the terminal for activating the wake-up receiver according to various embodiments of the present disclosure is shown. Various embodiments of the present disclosure may include all steps, at least one of some steps, or a combination of some steps described below, and it goes without saying that not only Figure 8 All steps, and Figure 8 Each step can bring about the effect that the present disclosure seeks to obtain. In addition, Figure 8 The steps shown in may be one example of one embodiment of the present disclosure, and various embodiments of the present disclosure performed by the terminal (or master radio) are not limited thereto.

[0241] In step 810, the terminal may transmit capability information related to wake-up reception to the base station and receive information necessary for wake-up reception. According to one embodiment, the terminal including the wake-up receiver may report to the base station that it has the capability to wake up the primary radio using the wake-up receiver, or may report capability information that the terminal includes the wake-up receiver to the base station. According to one embodiment, the terminal may also report capability information about the wake-up receiver to the base station through the UE capability information reporting procedure. According to one embodiment, the terminal may receive configuration information necessary for wake-up reception from the base station, such as period information necessary for the wake-up receiver to search for a wake-up signal, information on whether to always perform the search, resource information necessary for the search, etc.

[0242] In step 820, the terminal may receive activation information from the base station indicating that data transmission and reception is to be performed by waking up, or deactivation information indicating that data transmission and reception is no longer to be performed by waking up. According to one embodiment, the terminal may perform subsequent procedures according to the method proposed in the present invention, such as sending a response signal after a certain period of time after receiving the wake-up activation or deactivation information.

[0243] In step 830, the terminal may activate or deactivate wake-up reception based on the activation or deactivation instruction in step 820. According to one embodiment, the terminal may activate or deactivate wake-up reception and perform subsequent procedures according to the method proposed in the present invention, such as sending a response signal after a certain period of time.

[0244] Figure 9 The operation flow of a base station for sending a wake-up signal according to various embodiments of the present disclosure is shown. Various embodiments of the present disclosure may include all steps, at least one of some steps, or a combination of some steps described below, and it goes without saying that not only Figure 7 All steps, and Figure 9 Each step can bring about the effect that the present disclosure seeks to obtain. In addition, Figure 9 The steps shown in may be an example of one embodiment of the present disclosure, and various embodiments of the present disclosure performed by the base station are not limited thereto.

[0245] In step 910, the base station may receive capability information related to wake-up reception from the terminal and transmit information necessary for wake-up reception. According to one embodiment, the base station may receive capability information for waking up the primary radio using the wake-up receiver from the terminal including the wake-up receiver, or receive capability information of the terminal including the wake-up receiver. According to one embodiment, the base station may also receive capability information about the wake-up receiver from the terminal through the UE capability information reporting procedure. According to one embodiment, the base station may transmit configuration information necessary for wake-up reception to the terminal, such as period information necessary for the wake-up receiver to search for a wake-up signal, information on whether to always perform the search, and resource information necessary for the search.

[0246] In step 920, the base station may transmit activation information indicating that data transmission and reception are to be performed by waking up, or deactivation information indicating that data transmission and reception are no longer to be performed by waking up, to the terminal.

[0247] In step 930, the base station may receive response information regarding activation or deactivation of wake-up reception based on the activation or deactivation instruction in step 920. According to one embodiment, the base station may perform subsequent procedures according to the method proposed in the present invention, for example, receiving the response signal in step 930 after a certain period of time from the time when it is determined that the terminal has received the wake-up activation or deactivation information.

[0248] Figure 10 is a diagram illustrating a structure of a terminal in a wireless communication system according to various embodiments of the present disclosure.

[0249] Reference Figure 10 The terminal may include: a transceiver, which refers to a terminal receiving unit 1000 and a terminal transmitting unit 1010; a memory (not shown); and a terminal processing unit 1005 (or a terminal control unit or processor). The transceivers 1000 and 1010, the memory, and the terminal processing unit 1005 of the terminal may be operated according to the communication method of the terminal described above. However, the components of the terminal are not limited to the above examples. For example, the terminal may include more or fewer components than those described above. Furthermore, the transceiver, memory, and processor may be implemented in the form of a single chip.

[0250] Transceivers 1000 and 1010 can transmit and receive signals with a base station. The signals may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that performs low-noise amplification and down-converts the frequency of the received signal, and the like. However, this is only one embodiment of a transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver.

[0251] In addition, the transceivers 1000 and 1010 can receive a signal through a wireless channel and output it to the terminal processing unit 1005, and transmit a signal output from the terminal processing unit 1005 through a wireless channel.

[0252] The memory can store programs and data necessary for the operation of the terminal. In addition, the memory can store control information or data included in the signals sent and received by the terminal. The memory can be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM and DVD, or a combination of storage media. In addition, there can be multiple memories.

[0253] In addition, the terminal processing unit 1005 can control a series of processes so that the terminal can operate according to the above-mentioned embodiment. There can be multiple terminal processing units 1005, and the terminal processing unit 1005 can perform component control operations of the terminal by executing programs stored in the memory.

[0254] Figure 11 is a diagram illustrating a structure of a base station in a wireless communication system according to various embodiments of the present disclosure.

[0255] refer to Figure 11 The base station may include a transceiver, a memory (not shown), and a base station processing unit 1105 (or base station control unit or processor). The transceiver refers to the base station receiving unit 1100 and the base station transmitting unit 1110. The base station's transceivers 1100 and 1110, the memory, and the base station processing unit 1105 may operate according to the aforementioned base station communication method. However, the base station components are not limited to the aforementioned examples. For example, the base station may include more or fewer components than those described above. Furthermore, the transceiver, memory, and processor may be implemented as a single chip.

[0256] Transceivers 1100 and 1110 can transmit and receive signals with the terminal. The signals may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that performs low-noise amplification and down-converts the frequency of the received signal, and the like. However, this is only one embodiment of a transceiver, and the components of a transceiver are not limited to an RF transmitter and an RF receiver.

[0257] In addition, the transceivers 1100 and 1110 may receive a signal through a wireless channel and output it to the base station processing unit 1105 , and transmit a signal output from the base station processing unit 1105 through a wireless channel.

[0258] The memory can store programs and data required for base station operation. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can consist of a storage medium or a combination of storage media, such as ROM, RAM, a hard disk, a CD-ROM, and a DVD. Furthermore, there can be multiple memories.

[0259] The base station processing unit 1105 can control a series of processes so that the base station can operate according to the embodiments of the present disclosure described above. There can be multiple base station processing units 1105, and the base station processing unit 1105 can perform component control operations of the base station by executing programs stored in the memory.

[0260] The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0261] In the case of a software implementation, 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 to be executed by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods according to the embodiments described in the claims or specification of this disclosure.

[0262] These programs (software modules, software) may be stored in non-volatile memory, including random access memory, flash memory, ROM (read-only memory), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compact disks (CD-ROMs), digital versatile disks (DVDs) or other forms of optical storage devices, or cassette tapes. Alternatively, they may be stored in a memory consisting of a combination of some or all of these. Furthermore, each configuration memory may be included in multiple digital devices.

[0263] In addition, the program can be stored in an attachable storage device that can be accessed via a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or a combination thereof. The storage device can be connected to the device performing the embodiments of the present disclosure via an external port. In addition, a separate storage device on the communication network can be connected to the device performing the embodiments of the present disclosure.

[0264] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in singular or plural form, depending on the specific embodiment presented. However, for ease of explanation, singular or plural expression is appropriately selected for the presented situation, and the present disclosure is not limited to singular or plural components, and even if a component is expressed in plural form, it can also be composed of a singular form, or even if a component is expressed in singular form, it can also be composed of a plural form.

[0265] At the same time, the embodiments of the present disclosure disclosed in this specification and the accompanying drawings are merely for the purpose of easily explaining the technical content of the present disclosure and helping to understand specific examples of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it is easy for a person skilled in the art to which the present disclosure belongs to understand that other modified examples based on the technical ideas of the present disclosure are also possible. In addition, each of the above-mentioned embodiments can be combined and operated as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment can be combined and operated to operate a base station and a terminal. For example, parts of the first to third embodiments of the present disclosure can be combined and operated to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been proposed based on an FDD LTE system, other modified examples based on the technical ideas of the above-mentioned embodiments can be implemented in other systems such as a TDD LTE system, a 5G or NR system.

[0266] Meanwhile, the order of description in the drawings for explaining the method of the present invention does not necessarily correspond to the order of execution, and the order of priority may be changed or executed in parallel.

[0267] Alternatively, the drawings illustrating the method of the present invention may omit some components and include only some components without impairing the essence of the present invention.

[0268] Furthermore, the method of the present invention can be implemented by combining some or all of the contents included in each embodiment within the range not damaging the essence of the present invention.

[0269] 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 to which the present disclosure belongs will understand that the present disclosure can be easily modified into other specific forms without changing the technical ideas or essential features of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included within the scope of the present disclosure.

Claims

1. A method performed by a terminal of a wireless communication system, the method comprising: receiving an activation signal for activating a wake-up receiver from a base station based on the master radio MR; After receiving the activation signal, activating the wake-up receiver; as well as After receiving the activation signal, the primary radio is switched to a sleep state.

2. The method according to claim 1, further comprising transmitting a first response signal to the activation signal to the base station based on the primary radio, wherein After sending the first response signal, the primary radio switches to a sleep state.

3. The method according to claim 1, further comprising: transmitting a first response signal to the activation signal to the base station based on the primary radio; and After sending the first response signal, a wake-up signal WUS is received based on the wake-up receiver, wherein After receiving the WUS, the primary radio switches to sleep state.

4. The method according to claim 1, further comprising: transmitting a first response signal to the activation signal to the base station based on the primary radio; After sending the first response signal, receiving a wake-up signal WUS based on the wake-up receiver; and A second response signal to the WUS is sent to the base station based on the primary radio, wherein After sending the second response signal, the primary radio switches to a sleep state.

5. The method according to claim 1, further comprising: receiving, based on the primary radio, a deactivation signal from the base station for deactivating the wake-up receiver; and A third response signal to the deactivation signal is sent to the base station based on the primary radio, wherein The wake-up receiver is deactivated after sending the third response signal.

6. The method according to claim 5, wherein: When the terminal is in a radio resource control (RRC) IDLE or RRCINACTIVE state, the wake-up receiver is deactivated without sending the third response signal to the deactivation signal.

7. The method according to claim 1, further comprising: receiving, based on the wake-up receiver, a wake-up signal WUS for deactivating the wake-up receiver from the base station; switching the primary radio to an on state according to the WUS; and A fourth response signal to the WUS is transmitted to the base station based on the primary radio, wherein After a certain period of time from sending the fourth response signal, the wake-up receiver is deactivated.

8. The method according to claim 7, wherein: When the terminal is in a radio resource control (RRC) IDLE or RRCINACTIVE state, the wake-up receiver is deactivated and the fourth response signal to the WUS is not sent.

9. A terminal of a wireless communication system, comprising: transceiver; as well as A control unit, the control unit being configured to: receiving an activation signal for activating a wake-up receiver from a base station based on the master radio MR; activating the wake-up receiver after receiving the activation signal; as well as After receiving the activation signal, the primary radio is switched to a sleep state.

10. The terminal according to claim 9, wherein The control unit is configured to transmit a first response signal to the activation signal to the base station based on the primary radio, and after transmitting the first response signal, the primary radio switches to a sleep state. The terminal according to claim 9 , wherein The control unit is configured to: transmitting a first response signal to the activation signal to the base station based on the primary radio; and After sending the first response signal, a wake-up signal WUS is received based on the wake-up receiver, wherein After receiving the WUS, the primary radio switches to sleep state.

12. The terminal according to claim 9, wherein The control unit is configured to: transmitting a first response signal to the activation signal to the base station based on the primary radio; After sending the first response signal, receiving a wake-up signal WUS based on the wake-up receiver; and A second response signal to the WUS is sent to the base station based on the primary radio, wherein After sending the second response signal, the primary radio switches to a sleep state.

13. The terminal according to claim 9, wherein The control unit is configured to: receiving a deactivation signal for deactivating the wake-up receiver from the base station based on the primary radio; and A third response signal to the deactivation signal is sent to the base station based on the primary radio, wherein The wake-up receiver is deactivated after sending the third response signal. The terminal according to claim 13 , wherein: When the terminal is in a radio resource control (RRC) IDLE or RRC INACTIVE state, the wake-up receiver is deactivated without sending the third response signal to the deactivation signal.

15. The terminal according to claim 9, wherein The control unit is further configured to: receiving, based on the wake-up receiver, a wake-up signal WUS for deactivating the wake-up receiver from the base station; switching the primary radio to an on state according to the WUS; and A fourth response signal to the WUS is transmitted to the base station based on the primary radio, wherein After a certain period of time from sending the fourth response signal, the wake-up receiver is deactivated.

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