Method and device for serving cell measurement in wireless communication system

Abstract

The present invention provides a terminal comprising a main radio and a wake-up receiver, and a method comprising: receiving configuration information related to wake-up signal search; activating a wake-up receiver of the terminal on the basis of the configuration information; measuring a serving cell through the wake-up receiver; and identifying, through the wake-up receiver, whether a first measurement value of the serving cell is greater than a first threshold value.

Description

Method and device for measuring a serving cell in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for a terminal and a base station having a wake-up receiver to perform RRM (radio resource management) measurements.

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

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

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

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

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

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

[0008] As described above, as wireless communication systems develop, a method for signal transmission of terminals having wake-up receivers is required to solve the problem of excessive terminal power consumption and achieve high energy efficiency.

[0009] The present disclosure relates to a method and apparatus for a terminal and a base station to perform RRM (radio resource management) measurement in a wireless communication system.

[0010] The present disclosure provides a method and device for measuring radio resource management (RRM) of a terminal having a wake-up receiver, particularly a serving cell, in a wireless communication system.

[0011] The present disclosure, in order to solve the above problems, is characterized by a method for processing a control signal in a wireless communication system, comprising: a step of receiving a first control signal transmitted from a base station; a step of processing the received first control signal; and a step of transmitting a second control signal generated based on the processing to the base station.

[0012] By providing a method and device for measuring cell signal quality of a terminal having a wake-up receiver in the present disclosure, it is possible to solve the problem of excessive terminal power consumption in a wireless communication system and achieve high energy efficiency.

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

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

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

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

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

[0018] FIG. 6 illustrates an example block diagram of a terminal performing wake-up signal detection when a wake-up receiver according to an embodiment of the present disclosure cannot perform LR (lower power wake-up receiver) RRM (radio resource management) measurement / evaluation.

[0019] FIG. 7 illustrates an example block diagram of a terminal performing wake-up signal detection and determining serving cell measurement relaxation when a wake-up receiver according to an embodiment of the present disclosure is capable of performing LR RRM measurement / evaluation.

[0020] FIG. 8 illustrates an example in which a main radio applies serving cell measurement relaxation and performs MR (main radio) RRM measurement / evaluation according to one embodiment of the present disclosure.

[0021] FIG. 9 is a block diagram illustrating the functional structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0022] FIG. 10 is a block diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0023] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the attached drawings. It should be noted that, where possible, identical components are represented by identical reference numerals throughout the attached drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present disclosure will be omitted.

[0024] In describing the embodiments of this disclosure, descriptions of technical details that are well known in the technical field to which this disclosure pertains and are not directly related to this disclosure will be omitted. This is to more clearly convey the gist of this disclosure without obscuring it by omitting unnecessary explanations.

[0025] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0026] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the disclosure.

[0027] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0028] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0029] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0030] In the following description of the present disclosure, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings.

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

[0032] In the following description, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, while PDSCH (physical downlink shared channel) refers to a physical channel through which data is transmitted, PDSCH may also be used to refer to data. That is, in the present disclosure, the expression "transmitting a physical channel" may be interpreted equivalently to the expression "transmitting data or a signal through a physical channel."

[0033] Hereinafter, in the present disclosure, upper signaling refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of the physical layer, or a terminal transmits a signal to a base station using an uplink data channel of the physical layer. Upper signaling can be understood as radio resource control (RRC) signaling or a media access control (MAC) control element (CE).

[0034] Furthermore, while this disclosure describes various embodiments using terminology used in certain communication standards (e.g., 3rd Generation Partnership Project (3GPP)), these are merely illustrative examples. The various embodiments of this disclosure can be easily modified and applied to other communication systems. Furthermore, the term "terminal" can refer to not only cell phones, smartphones, IoT devices, and sensors, but also other wireless communication devices.

[0035] Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, an eNB, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (user equipment), an MS (mobile station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Of course, the present invention is not limited to the above examples. In addition, although various embodiments of the present invention are described below using a system based on LTE, LTE-A, or NR as an example, various embodiments of the present invention may be applied to other communication systems having a similar technical background or channel type. In addition, various embodiments of the present invention may be applied to other communication systems through some modifications without significantly departing from the scope thereof at the discretion of a person having skilled technical knowledge.

[0036] To handle the explosive growth in mobile data traffic, the initial standards for the 5G (5th generation) system, or NR (new radio access technology), the next-generation communication system following LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)) and LTE-A (LTE-advanced or E-UTRA Evolution), have been completed. While existing mobile communication systems have focused on conventional voice / data communications, the 5G system aims to satisfy various services and requirements, such as enhanced Mobile BroadBand (eMBB) services to improve existing voice / data communications, ultra-reliable and low latency communication (URLLC) services, and massive machine type communication (MTC) services that support large-scale machine-type communication.

[0037] While the transmission bandwidth of existing LTE and LTE-A systems per single carrier is limited to a maximum of 20 MHz, the 5G system aims to utilize a much wider ultra-wide bandwidth to provide ultra-high-speed data services of up to several Gbps. Accordingly, the 5G system is considering ultra-high frequency bands ranging from several GHz up to 100 GHz as candidate frequencies, where securing ultra-wide bandwidth frequencies is relatively easy. Additionally, wide bandwidth frequencies for the 5G system can be secured through frequency reallocation or allocation within frequency bands ranging from several hundred MHz to several GHz used in existing mobile communication systems.

[0038] Ultra-high frequency radio waves, sometimes called millimeter waves (mmWave), have wavelengths on the order of millimeters. However, in ultra-high frequency bands, path loss increases proportionally to the frequency band, reducing the coverage of mobile communication systems.

[0039] To overcome the drawback of reduced coverage in ultra-high frequency bands, beamforming technology is applied, which uses multiple antennas to focus radio wave energy toward a predetermined target point and thereby increase the transmission range. In other words, a signal using beamforming technology has a relatively narrow beam width, and the radiation energy is concentrated within this narrowed beam width, increasing the transmission range. Beamforming technology can be applied to both the transmitter and receiver. In addition to increasing coverage, beamforming technology also reduces interference in areas outside the beamforming direction. For beamforming technology to function properly, accurate measurement and feedback methods for the transmission and reception beams are required. Beamforming technology can be applied to control channels or data channels that correspond one-to-one between a given terminal and a base station. Furthermore, beamforming can also be applied to common signals transmitted by a base station to multiple terminals within a system, such as synchronization signals, physical broadcast channels (PBCHs), and control and data channels for transmitting system information, to increase coverage. When applying beamforming technology to a common signal, beam sweeping technology, which transmits a signal by changing the beam direction, is additionally applied so that the common signal can reach terminals located at any location within the cell.

[0040] Another requirement for 5G systems is ultra-low latency services, with transmission delays of approximately 1ms between transmitters and receivers. One way to reduce transmission delay is to design a frame structure based on a short transmission time interval (TTI) compared to LTE and LTE-A. A TTI is the basic unit of time for scheduling, and the TTI of existing LTE and LTE-A systems is 1ms, which corresponds to the length of one subframe. For example, to meet the ultra-low latency requirements of 5G systems, possible short TTIs include 0.5ms, 0.25ms, and 0.125ms, which are shorter than those of existing LTE and LTE-A systems.

[0041] FIG. 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system according to one embodiment of the present disclosure.

[0042] The time-frequency resource domain is a radio resource domain in which data or control channels of a 5G system are transmitted.

[0043] Referring to Figure 1, the horizontal axis in Figure 1 represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain of a wireless communication system is an OFDM (orthogonal frequency division multiplexing) symbol. The dog symbols (102) come together to form one slot (106), A plurality of slots can be combined to form a subframe (105). The length of the subframe is 1.0 ms, and 10 subframes can be combined to form a 10 ms frame (114). The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is a total of N BW It can be composed of (104) subcarriers.

[0044] The basic unit of resources in the time-frequency domain is a resource element (RE) (112), which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB or physical resource block, PRB) is a resource block in the frequency domain. can be defined as a series of consecutive subcarriers (110). In the 5G system = 12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0045] In wireless communication systems, a base station can map data in RB units and perform scheduling on RBs, which typically constitute a slot for a given terminal. That is, in a 5G system, the basic time unit for scheduling may be a slot, and the basic frequency unit for scheduling may be an RB.

[0046] Number of OFDM symbols It is determined by the length of the cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, if the normal CP is applied, = 14, when Extended CP is applied = can be 12. Extended CP is applied to systems with relatively long transmission distances compared to general CP, and can maintain orthogonality between symbols. In the case of general CP, since the ratio of CP length to symbol length is maintained at a constant value, the overhead due to CP can be maintained constant regardless of the subcarrier spacing. That is, if the subcarrier spacing is small, the symbol length becomes longer, and thus the CP length can also become longer. Conversely, if the subcarrier spacing is large, the symbol length becomes shorter, and thus the CP length can be reduced. The symbol length and CP length can be inversely proportional to the subcarrier spacing.

[0047] In wireless communication systems, various frame structures can be supported by adjusting the subcarrier spacing to satisfy various services and requirements. For example, from the perspective of operating frequency band, a larger subcarrier spacing is advantageous for recovering phase noise in high-frequency bands. From the perspective of transmission time, a larger subcarrier spacing shortens the symbol length in the time domain, which in turn shortens the slot length, making it advantageous for supporting ultra-low-latency services such as URLLC. From the perspective of cell size, a longer CP length allows for larger cells, so a smaller subcarrier spacing allows for relatively larger cells. In mobile communications, a cell is a concept referring to the area covered by a single base station.

[0048] Subcarrier spacing, CP length, etc. are essential information for OFDM transmission and reception. For smooth transmission and reception, the base station and terminal must recognize the subcarrier spacing, CP length, etc. as common values.

[0049] [Table 1] below shows the subcarrier spacing configuration (μ) and subcarrier spacing ( f), shows the relationship of CP length.

[0050]

[0051] [Table 2] below shows the number of symbols per slot for each subcarrier spacing setting (μ) for the general CP. ), number of slots per frame ( ), number of slots per subframe ( ) is indicated.

[0052]

[0053] [Table 3] below shows the number of symbols per slot (μ) for each subcarrier spacing setting for extended CP. ), number of slots per frame ( ), number of slots per subframe ( ) is indicated.

[0054]

[0055] In the early stages of 5G system deployment, coexistence or dual-mode operation with existing LTE and / or LTE-A (hereinafter referred to as LTE / LTE-A) systems was anticipated. This would allow existing LTE / LTE-A systems to provide stable system operation to terminals, while the 5G system would provide enhanced services to terminals. Therefore, the 5G system's frame structure must at least include the LTE / LTE-A frame structure or essential parameter set (e.g., subcarrier spacing = 15 kHz).

[0056] For example, comparing a frame structure with a subcarrier spacing setting μ=0 (hereinafter referred to as frame structure A) and a frame structure with a subcarrier spacing setting μ=1 (hereinafter referred to as frame structure B), compared to frame structure A, frame structure B shows that the subcarrier spacing and RB size are twice as large, and the slot length and symbol length are twice as small. In the case of frame structure B, two slots can constitute one subframe, and 20 subframes can constitute one frame.

[0057] Generalizing the frame structure of a 5G system provides high scalability by ensuring that essential parameters—subcarrier spacing, CP length, and slot length—have integer multiple relationships for each frame structure. A fixed-length subframe of 1 ms can be defined to represent a reference time unit independent of the frame structure.

[0058] The frame structure can be applied to various scenarios. From the perspective of cell size, the longer the CP length, the larger the cell can be supported, so frame structure A can support relatively larger cells than frame structure B. From the perspective of operating frequency band, the larger the subcarrier spacing, the more advantageous it is for recovering phase noise in the high-frequency band, so frame structure B can support relatively higher operating frequencies than frame structure A. From the perspective of service, the shorter the slot length, which is the basic time unit of scheduling, the more advantageous it is for supporting ultra-low-latency services such as URLLC, so frame structure B can be relatively more suitable for URLLC services than frame structure A.

[0059] In the following description of the present disclosure, uplink (UL) may refer to a wireless link through which a terminal transmits data or a control signal to a base station, and downlink (DL) may refer to a wireless link through which a base station transmits data or a control signal to a terminal.

[0060] In the initial access stage where a terminal first accesses the system, the terminal can synchronize downlink time and frequency from a synchronization signal transmitted by a base station through cell search, and obtain a cell identifier (cell ID). The terminal can receive a physical broadcast channel (PBCH) using the obtained cell ID, and obtain a master information block (MIB), which is essential system information, from the PBCH. Additionally, the terminal can obtain cell-common transmission and reception-related control information by receiving system information (system information block, SIB) transmitted by the base station. The cell-common transmission and reception-related control information may include random access (RA)-related control information, paging-related control information, and common control information for various physical channels.

[0061] The synchronization signal serves as a reference for cell search, and the subcarrier spacing can be applied to suit channel conditions such as phase noise for each frequency band. In the case of data channels or control channels, the subcarrier spacing can be adaptively applied depending on the service type to support various services as described above.

[0062] Figure 2 illustrates the time domain mapping structure and beam sweeping operation of a synchronization signal.

[0063] Hereinafter, the following components may be predefined for the purpose of explaining the present disclosure.

[0064] - PSS (primary synchronization signal): A signal that serves as the basis for DL ​​time / frequency synchronization and can provide some cell ID information.

[0065] - SSS (secondary synchronization signal): It serves as a reference for DL ​​time / frequency synchronization and can provide some remaining information, including the cell ID. Additionally, it can serve as a reference signal (RS) for PBCH demodulation.

[0066] - PBCH (physical broadcast channel): It can provide MIB (master information block), which is essential system information required for transmission and reception of data channels and control channels of the terminal. Essential system information can include control information related to the search space indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel that transmits system information, and SFN (system frame number), which is a frame-unit index that serves as a timing reference.

[0067] - SS / PBCH block (synchronization signal / PBCH block or SSB): An SS / PBCH block can be composed of N OFDM symbols and can include a combination of PSS, SSS, PBCH, etc. In a system where beam sweeping technology is applied, an SS / PBCH block can be the minimum unit to which beam sweeping is applied. In a 5G system, N can be 4. The base station can transmit up to L SS / PBCH blocks, and the L SS / PBCH blocks can be mapped within a half frame (0.5 ms). The L SS / PBCH blocks can be periodically repeated in units of a predetermined period P. The period P can be notified to the terminal by signaling from the base station. If there is no separate signaling for the period P, the terminal can apply a pre-agreed default value.

[0068] FIG. 2 illustrates an example in which beam sweeping is applied to SS / PBCH block units over time. In the example of FIG. 2, terminal 1 (205) can receive an SS / PBCH block using a beam radiated in the direction of #d0 (203) by beamforming applied to SS / PBCH block #0 at time t1 (201). Terminal 2 (206) can receive an SS / PBCH block using a beam radiated in the direction of #d4 (204) by beamforming applied to SS / PBCH block #4 at time t2 (202). The terminal can obtain an optimal synchronization signal through a beam radiated from the base station in the direction where the terminal is located. For example, terminal 1 (205) may have difficulty in obtaining time / frequency synchronization and essential system information from an SS / PBCH block through a beam radiated in the direction of #d4 (204) which is far from the location of terminal 1 (205).

[0069] In addition to the initial connection procedure, the terminal may receive SS / PBCH blocks to determine whether the radio link quality of the current cell is maintained at a certain level. Furthermore, during a handover procedure, in which the terminal moves from the current cell to a neighboring cell, the terminal may receive SS / PBCH blocks from the neighboring cell to determine the radio link quality of the neighboring cell and obtain time / frequency synchronization with the neighboring cell.

[0070] After the terminal acquires MIB and system information from the base station through the initial access procedure, the terminal can perform a random access procedure to transition the link with the base station to the connected state (or RRC_CONNECTED state). Upon completion of the random access procedure, the terminal transitions to the connected state (or RRC_CONNECTED state), enabling one-to-one communication between the base station and the terminal. The random access procedure is described in detail below with reference to FIG. 3.

[0071] Figure 3 illustrates the flow of signals for random access (RA).

[0072] Referring to FIG. 3, in step 310, a terminal may transmit a random access preamble to a base station. The random access preamble, which is the first transmission message of the terminal in the random access procedure, may be referred to as message 1. The base station may measure a transmission delay value between the terminal and the base station from the random access preamble and synchronize uplink. At this time, the terminal may arbitrarily select which random access preamble to use within a random access preamble set given in advance by system information. The initial transmission power of the random access preamble may be determined according to the path loss measured by the terminal between the base station and the terminal. In addition, the terminal may determine the transmission beam direction of the random access preamble from the synchronization signal received from the base station and transmit the random access preamble.

[0073] In step 320, the base station may transmit a random access response (RAR) (or message 2) for the random access preamble received in step 310. The base station may transmit an uplink transmission timing adjustment command to the terminal based on a transmission delay value measured from the random access preamble. The base station may transmit to the terminal uplink resources to be used and a power control command as scheduling information. The scheduling information transmitted by the base station may include control information for the uplink transmission beam of the terminal.

[0074] If the terminal does not receive the random access response (RAR) (or message 2), which is scheduling information for message 3, from the base station within a predetermined time in step 320, step 310 may be performed again. If step 310 is performed again, the terminal may increase the probability of the base station receiving the random access preamble by transmitting the random access preamble with a transmission power increased by a predetermined step (e.g., power ramping).

[0075] In step 330, the terminal can transmit uplink data including its terminal ID (i.e., message 3) to the base station using the uplink resources allocated in step 320. The terminal can transmit the uplink data including the terminal ID to the base station through an uplink data channel (physical uplink shared channel, PUSCH). The transmission timing of the uplink data channel for transmitting Message 3 may follow the timing control command received from the base station in step 320. The transmission power of the uplink data channel for transmitting Message 3 may be determined by considering the power control command received from the base station in step 320 and the power ramping value of the random access preamble. The uplink data channel for transmitting Message 3 may mean the first uplink data signal that the terminal transmits to the base station after transmitting the random access preamble.

[0076] In step 340, if the base station determines that the terminal has performed random access without collision with other terminals, it can transmit data (i.e., message 4) including the ID of the terminal that transmitted uplink data in step 330 to the terminal. If the terminal receives the signal transmitted by the base station in step 340 from the base station, it can determine that the random access has been successful. The terminal can transmit HARQ-ACK (hybrid automatic repeat request acknowledgment) information indicating whether message 4 was successfully received to the base station through the uplink control channel (physical uplink control channel, PUCCH).

[0077] If the data transmitted by the terminal in step 330 collides with data from another terminal, causing the base station to fail to receive a data signal from the terminal, the base station may not transmit any more data to the terminal. If the terminal fails to receive the data transmitted from the base station in step 340 within a certain period of time, it may determine that the random access procedure has failed and may proceed again from step 310.

[0078] When a terminal successfully completes a random access procedure, the terminal transitions to a connected state (or RRC_CONNECTED state), and one-to-one communication can be enabled between the base station and the terminal. The base station can receive terminal capability (UE capability) information from the terminal in the connected state (or RRC_CONNECTED state) and adjust scheduling by referring to the terminal capability (UE capability) information of the corresponding terminal. Through the terminal capability (UE capability) information, the terminal can inform the base station whether it supports a certain function, the maximum allowable value of the function supported by the terminal, etc. Therefore, the terminal capability (UE capability) information reported by each terminal to the base station can have different values ​​for each terminal.

[0079] For example, a terminal may report terminal capability information including at least one of the following control information to a base station.

[0080] - Control information related to frequency bands supported by the terminal

[0081] - Control information related to channel bandwidth supported by the terminal

[0082] - Control information related to the maximum modulation method supported by the terminal

[0083] - Control information related to the maximum number of beams supported by the terminal

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

[0085] - Control information related to CSI reporting supported by the terminal

[0086] - Control information on whether the terminal supports frequency hopping

[0087] - Bandwidth-related control information when supporting carrier aggregation (CA)

[0088] - Control information on whether cross carrier scheduling is supported when carrier aggregation is supported.

[0089] Figure 4 illustrates the flow of signals for a terminal to report terminal capability information to a base station.

[0090] Referring to FIG. 4, at step 410, the base station (402) may transmit a UE capability information request message to the terminal (401). Based on the UE capability information request from the base station (402), the terminal (401) may transmit UE capability information to the base station at step 420. According to one embodiment, the terminal (401) may transmit UE capability information to the base station (402) regardless of the UE capability information request from the base station (402).

[0091] Based on the transmission and reception process of terminal capability information, a terminal connected to a base station can communicate one-to-one with the base station as a terminal in the RRC_CONNECTED state. Conversely, a terminal that is not connected can be in the RRC_IDLE state, and a terminal in the RRC_IDLE state can perform the following processes.

[0092] - Performs terminal-specific DRX (discontinuous reception) cycles set by the upper layer.

[0093] - Receive paging messages from the core network

[0094] - Obtain system information

[0095] - Measurement actions related to serving cells (or camping cells) and cell selection / reselection

[0096] - Measurement operations related to surrounding cells and cell reselection

[0097] In more detail with respect to the measurement operation and cell selection / reselection related to the serving cell (or the cell on which the UE is camping) (referred to as MR (main radio) RRM (radio resource management) measurement / evaluation in this disclosure), the UE can measure the SS-RSRP (synchronization signal - reference signal received power) and SS-RSRQ (synchronization signal - reference signal received quality) levels for the serving cell (or the cell on which the UE is camping) at least every M1*N1 DRX cycle, and evaluate the cell selection decision criterion S based on the measured values. Here, when the SMTC (SSB-based measurement timing configuration) period is greater than 20ms and the DRX cycle is less than or equal to 0.64s, M1=2, and in other cases, M1=1.

[0098] N1 can be determined by the following table.

[0099]

[0100] The cell selection criterion S corresponds to SS-RSRP rxlev > 0 and S corresponding to SS-RSRQ qual > 0 can be satisfied.

[0101] S rxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset )- Pcompensation - Q offsettemp

[0102] S qual = Q qualmeas - (Q qualmin + Q qualminoffset ) - Q offsettemp

[0103] Here, Q rxlevmeas is the measured SS-RSRP, and Q qualmeas is the measured SS-RSRQ, and Q rxlevmin is the minimum required reception signal level in the serving cell and can be received by the terminal as system information, and Q qualmin is the quality level of the received signal required at the minimum limit in the serving cell and can be received by the terminal as system information. The remaining parameters are presented in 3GPP TS 38.304. The terminal can determine the SS-RSRP of the serving cell by filtering from at least two measurement values ​​that are spaced apart by at least half a DRX cycle in determining the measured SS-RSRP. In addition, the terminal can determine the SS-RSRQ of the serving cell by filtering from at least two measurement values ​​that are spaced apart by at least half a DRX cycle in determining the measured SS-RSRQ.

[0104] More specifically, regarding the measurement behavior and cell reselection related to surrounding cells, the terminal is N serv If the UE determines that the serving cell does not satisfy the cell selection criterion S during consecutive DRX cycles, the UE may initiate measurements of all surrounding cells other than the serving cell. If the UE fails to find a new suitable cell for 10 s, the UE may initiate a cell selection procedure for the selected public land mobile network (PLMN).

[0105] The terminal starts measuring the surrounding cells every T measure Measure the SS-RSRP and SS-RSRQ levels every T and the surrounding cellsevaluate It can be evaluated whether the cell reselection criteria are satisfied within the newly detected cell. The newly detected cell is selected every T detect It can be evaluated whether the cell reselection criteria are satisfied. T reselection During the cell reselection, if a neighboring cell is better than the serving cell based on the cell reselection judgment criteria, and at the same time, if more than 1 second has passed since the terminal camped on the current serving cell, the terminal can reselect the neighboring cell as the new serving cell. Here, the T measure , T evaluate , T reselection Parameters such as may be determined in the specification according to the DRX cycle or may be set by a higher level signal. The terminal may determine the measured SS-RSRP by at least T measure The SS-RSRP of the surrounding cells can be determined by filtering from at least two measurements that are half a distance apart.

[0106] The above cell reselection judgment criteria are calculated by the following parameters R s , R n The cell selection order can be determined based on R. s , R n You can determine the cell ranking in order of highest value across all.

[0107] R s = Q meas,s + Q hyst - Qoffset temp

[0108] R n = Q meas,n - Qoffset - Qoffset temp

[0109] Here, Q meas,s , Q meas,n represents the RSRP measurement values ​​of the serving cell and surrounding cells, respectively, and Q hyst , Qoffset, Qoffset temp The back can be set by a higher signal.

[0110] When a specific condition is satisfied in relation to the measurement of surrounding cells, the measurement of surrounding cells is stopped or the above T measure It is possible to perform neighboring cell measurements by a longer period. In one embodiment, if the terminal is moving slowly or stopped within the cell, or if it is determined that the terminal is not at the cell edge, the terminal may perform T measure You can measure surrounding cells at longer intervals by multiplying the scaling factor, or stop measuring surrounding cells for up to 1 hour.

[0111] In 5G systems, a new terminal state called RRC_INACTIVE has been defined to reduce the energy and time consumed during initial access. In addition to the actions performed by RRC_IDLE terminals, RRC_INACTIVE terminals can perform the following processes:

[0112] - Storage of AS (access stratum) information required for cell access

[0113] - Terminal-specific DRX cycle operation set by the RRC layer

[0114] - Setting up and periodically updating RNA (RAN (radio access network)-based notification area) that can be utilized during handover by the RRC layer

[0115] - Monitoring of RAN-based paging messages transmitted via I-RNTI (inactive-radio network temporary identifier)

[0116] A terminal in RRC_CONNECTED state can change from RRC_CONNECTED to RRC_INACTIVE or RRC_IDLE state by receiving an RRC Release instruction from the base station.

[0117] A terminal in RRC_INACITVE or RRC_IDLE state can change from RRC_INACTIVE or RRC_IDLE to RRC_CONNECTED state by performing random access and completing all random access procedures.

[0118] Below, a scheduling method for a base station to transmit downlink data to a terminal or instruct the terminal to transmit uplink data is described.

[0119] Downlink control information (DCI) may be control information transmitted from a base station to a terminal via the downlink. Downlink control information may include downlink data scheduling information or uplink data scheduling information for a given terminal. Typically, the base station independently performs channel coding on DCI for each terminal and then transmits it to each terminal via a physical downlink control channel (PDCCH).

[0120] The base station can operate by applying a DCI format determined for the purpose of scheduling, such as whether it is scheduling information for downlink data (downlink assignment), scheduling information for uplink data (uplink grant), or DCI for power control.

[0121] A base station can transmit downlink data to a terminal via the physical downlink shared channel (PDSCH), a physical channel for downlink data transmission. The base station can inform the terminal of scheduling information, such as the specific mapping location in the time and frequency domains of the PDSCH, modulation scheme, HARQ-related control information, and power control information, through DCI related to downlink data scheduling information among the DCIs transmitted via the PDCCH.

[0122] A terminal can transmit uplink data to a base station via the physical uplink shared channel (PUSCH), a physical channel for uplink data transmission. The base station can inform the terminal of scheduling information, such as the specific mapping location in the time and frequency domains of the PUSCH, modulation method, HARQ-related control information, and power control information, through DCI related to uplink data scheduling information among the DCI transmitted via the PDCCH.

[0123] The time-frequency resources to which the PDCCH is mapped may be referred to as a control resource set (CORESET). A CORESET may be configured for all or part of the frequency resources of the bandwidth supported by the terminal in the frequency domain. In the time domain, it may be configured with one or more OFDM symbols, which may be defined as the CORESET length (control resource set duration). The base station may configure one or more CORESETs to the terminal through higher layer 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, the frequency location of the CORESET, and the symbol length of the CORESET. The information that the base station provides to the terminal to configure the CORESET may include at least some of the information included in [Table 5] below.

[0124]

[0125]

[0126] CORESET is in the frequency domain It can be composed of RBs and in the time domain ∈{1,2,3} symbols. The NR PDCCH may be composed of one or more control channel elements (CCEs). One CCE may be composed of six resource element groups (REGs), and a REG may be defined as one RB during one OFDM symbol. Within one CORESET, REGs may be indexed in time-first order, starting with REG index 0 from the first OFDM symbol of the CORESET, the lowest RB.

[0127] Interleaved and non-interleaved transmission methods for PDCCH can be supported. The base station can configure whether to use interleaved or non-interleaved transmission for each CORESET to the terminal through upper layer signaling. Interleaving can be performed on a per REG bundle basis. A REG bundle can be defined as a set of one or more REGs. The terminal can determine the CCE-to-REG mapping method for the corresponding CORESET based on whether to use interleaved or non-interleaved transmission as configured by the base station, as shown in [Table 6] below.

[0128]

[0129] The base station can provide the terminal with configuration information, such as information about the symbol to which the PDCCH is mapped within the slot and the transmission period, through signaling.

[0130] The search space of the PDCCH is described as follows. The number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs can be used for link adaptation of the downlink control channel. For example, when AL=L, a single downlink control channel can be transmitted through L CCEs. The UE performs blind decoding, which detects a signal without knowing information about the downlink control channel. 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 UE should attempt to decode at a given aggregation level. Since there are various aggregation levels that create a single group with 1, 2, 4, 8, or 16 CCEs, the UE can have multiple search spaces. A search space set can be defined as the set of search spaces at all established aggregation levels.

[0131] Search spaces can be classified into a common search space (CSS) and a UE-specific search space (USS). A certain group of UEs, or all UEs, can scan the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling for system information blocks (SIBs) or paging messages. For example, a UE can receive scheduling allocation information for a PDSCH for system information reception by scanning the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. UE-specific scheduling allocation information for a PDSCH or PUSCH can be received by scanning the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE ID and various system parameters.

[0132] The base station can configure the search space configuration information of the PDCCH to the terminal through higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the CORESET index to be monitored for the search space, etc. to the terminal. For example, the parameters for the search space for the PDCCH may include information such as the information in [Table 7] below.

[0133]

[0134]

[0135] Based on the configuration information transmitted to the terminal, the base station may configure one or more search space sets for the terminal. According to one embodiment, the base station may configure search space set 1 and search space set 2 for the terminal. In search space set 1, the terminal may be configured to monitor DCI format A scrambled with X-RNTI in a common search space, and in search space set 2, the terminal may be configured to monitor DCI format B scrambled with Y-RNTI in a terminal-specific search space.

[0136] According to the configuration information transmitted by the base station, one or more search space sets may exist in the common search space or the terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as the common search space, and search space set #3 and search space set #4 may be configured as the terminal-specific search space.

[0137] In a common search space, a terminal may monitor the following combinations of DCI formats and RNTIs. Various embodiments of the present disclosure, of course, are not limited to the examples below.

[0138] - 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

[0139] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0140] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0141] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0142] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0143] In a terminal-specific search space, a terminal may monitor the following combinations of DCI formats and RNTIs. Various embodiments of the present disclosure, of course, are not limited to the examples below.

[0144] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0145] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0146] RNTIs may follow the following definitions and uses. According to various embodiments of the present disclosure, of course, they are not limited to the examples below.

[0147] - C-RNTI (cell RNTI): For terminal-specific PDSCH or PUSCH scheduling purposes.

[0148] - TC-RNTI (temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0149] - CS-RNTI (configured scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0150] - RA-RNTI (random access RNTI): Used for PDSCH scheduling in the random access phase.

[0151] - P-RNTI (paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0152] - SI-RNTI (system information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0153] - INT-RNTI (interruption RNTI): Used to indicate whether puncturing is performed on the PDSCH.

[0154] - TPC-PUSCH-RNTI (transmit power control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0155] - TPC-PUCCH-RNTI (transmit power control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0156] - TPC-SRS-RNTI (transmit power control for SRS RNTI): Used to indicate power control commands for SRS.

[0157] The DCI formats described above can follow the definitions shown in [Table 8] below.

[0158]

[0159] CORESET p, the search space of aggregation level L in the search space set s can be expressed as the following mathematical formula.

[0160]

[0161] - L: Integration level

[0162] - nCI: carrier index

[0163] - NCCE,p: Total number of CCEs within the control resource set p

[0164] - nμs,f: slot index

[0165] - M(L)p,s,max: Number of PDCCH candidates for aggregation level L

[0166] - msnCI = 0, ..., M(L)p,s,max -1: PDCCH candidate index of aggregation level L

[0167] - i = 0, ..., L-1

[0168]

[0169] - nRNTI: Terminal identifier

[0170] The value can be 0 for a common search space.

[0171] In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's ID (C-RNTI or ID set to the terminal by the base station) and the time index.

[0172] As described above, to achieve ultra-high-speed data services reaching several Gbps in 5G systems, ultra-wide bandwidth signal transmission and reception of tens to hundreds of MHz or even several GHz may be supported. Ultra-wide bandwidth signal transmission and reception may be supported through a single component carrier (CC) or through carrier aggregation (CA) technology that combines multiple component carriers. When a mobile communication service provider cannot secure a frequency with sufficient bandwidth for ultra-high-speed data services through a single component carrier, carrier aggregation technology can increase the total frequency bandwidth by combining individual component carriers with relatively small bandwidths, thereby enabling ultra-high-speed data services.

[0173] 5G systems are designed and developed to address a wide range of use cases. In addition to standby time, reliability, and availability, device energy efficiency is crucial in 5G systems. 5G devices typically consume tens of milliwatts (mW) in RRC_IDLE / RRC_INACTIVE states and hundreds of mW in RRC_CONNECTED states, requiring weekly or daily charging depending on individual usage. Designing for extended battery life can be essential not only for a better user experience but also for improving energy efficiency. Energy efficiency can be even more critical for devices without a continuous power source (e.g., devices using small rechargeable or single coin-cell batteries). Sensors and actuators are widely deployed in 5G use cases for monitoring, measurement, and charging. Typically, these devices require batteries that are non-rechargeable and can last for at least several years. Wearables, including smartwatches, rings, eHealth devices, and medical monitoring devices, typically struggle to last more than one to two weeks, depending on usage.

[0174] In one embodiment, the power consumption of a 5G terminal depends on the set length of wake-up periods (e.g., paging cycles), and a large extended discontinuous reception (eDRX) cycle may be used to meet battery life requirements. However, the eDRX approach relies on high latency to maintain long battery life, making it unsuitable for low-latency services. For example, in a fire detection and extinguishing use case, fire shutters may need to be closed and sprinklers turned on by actuators within 1-2 seconds of a fire being detected by a sensor. In this case, latency may be critical, and a long eDRX cycle, as in the past, is not suitable because it cannot meet the latency requirements.

[0175] As described above, existing terminals are not suitable for simultaneously satisfying both good energy efficiency and low latency requirements. Accordingly, the introduction of a low-power wake-up receiver (LP-WUR), a separate receiver that can reduce power consumption and satisfy low latency requirements when there is no terminal traffic, is being discussed. For example, the low-power wake-up receiver may be a receiver that is functionally distinct from the wake-up receiver of an existing terminal. In this case, the low-power wake-up receiver and the wake-up receiver of an existing terminal may be hardware-separated and configured separately, or a wake-up receiver configured as a single hardware unit may appropriately perform either low-power wake-up reception or basic wake-up reception depending on the communication situation. A terminal including a wake-up receiver will be described in detail below.

[0176] FIG. 5 illustrates an example of state transitions between a base station and a terminal, and a state of a terminal according to a base station state, according to one embodiment of the present disclosure. Specifically, FIG. 5 illustrates state transitions between a base station and a terminal to address the aforementioned issues.

[0177] According to one embodiment of the present disclosure, a 5G terminal may need to wake up periodically once per DRX cycle, which (performed wake-up periodically per DRX cycle) may dominate power consumption during periods without signaling or data traffic. If the terminal can wake up only when triggered, such as by paging, the power consumption of the terminal may be drastically reduced. As shown in FIG. 5, a low-power wake-up signal (LP-WUS) is used to trigger the main radio (main radio or main receiver, e.g., a conventional NR radio), and a separate receiver, a wake-up receiver, which can monitor the wake-up signal at ultra-low power, turns on the main radio only when data transmission and reception are required (make main radio on) to achieve a drastic reduction in power consumption.

[0178] In one embodiment, in operation 501, the base station may transmit a wake-up signal to the terminal.

[0179] In operation 502, the terminal can receive a wake-up signal transmitted by the base station using a wake-up receiver.

[0180] In operation 503, the terminal can trigger the main radio of the terminal that is in an off state based on a received wake-up signal.

[0181] In operation 504, the terminal may set its main radio to an on state. If there is no data traffic to be transmitted from the base station to the terminal and the conditions for the terminal to monitor a wake-up signal are met, the terminal may set / change the main radio to an off state and enter a sleep state. In one embodiment, the terminal may be set to a deep sleep (DS) or ultra-deep sleep (UDS) state rather than a complete off state. A terminal in a UDS state may consume less power than a terminal in a DS state.

[0182] In operation 505, if data traffic to be transmitted from the base station to the terminal is generated and a wake-up signal transmitted by the base station in step 501 is detected, in step 506, the main radio can be turned on, and the terminal can receive the data transmitted by the base station through the main radio rather than the wake-up receiver.

[0183] According to one embodiment of the present disclosure, the power consumption for a terminal to monitor a wake-up signal depends on the hardware module of the wake-up receiver used for designing the wake-up signal, detecting the signal, and processing the signal, so that the gain can be maximized for power-sensitive and small form factor devices, including IoT use cases (such as industrial sensors and controllers) and wearables.

[0184] According to one embodiment of the present disclosure, a terminal including a wake-up receiver may report to a base station that it has the capability to wake up the main radio using the wake-up receiver. Alternatively, the terminal including the wake-up receiver may report to the base station capability information indicating that the terminal includes a wake-up receiver.

[0185] According to one embodiment of the present disclosure, a terminal may report capability information about a wake-up receiver to a base station through the terminal capability information reporting procedure of FIG. 4.

[0186] According to one embodiment of the present disclosure, when a base station supports a terminal including a wake-up receiver (e.g., when the base station has hardware capable of transmitting a wake-up signal), the base station may receive terminal capability information about the wake-up receiver from the terminal and then determine whether the terminal uses the wake-up receiver. According to one embodiment of the present disclosure, the base station may transmit a signal to the terminal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal. According to one embodiment of the present disclosure, the base station may transmit to the terminal at least one of indication information for the terminal to receive the wake-up signal or to activate the wake-up receiver, or indication information for notifying the base station of transmission of the wake-up signal. After a slot configured (or defined in the standard) by the base station from a slot in which the wake-up signal is received, the terminal may turn off the main radio of the terminal and turn on the wake-up receiver for monitoring the wake-up signal. According to one embodiment of the present disclosure, if a measurement value for a serving cell is maintained greater than a specified threshold for a predetermined period of time, the terminal may turn off the main radio and turn on a wake-up receiver for monitoring a wake-up signal. According to one embodiment of the present disclosure, if a measurement value for a serving cell is maintained less than or equal to a specified threshold for a predetermined period of time, the terminal may turn on the main radio. In this case, the serving cell measurement may use at least one of the measurement values ​​of the wake-up receiver or the main radio.

[0187] According to one embodiment of the present disclosure, when a base station does not support a terminal having a wake-up receiver, the base station may receive capability information about the wake-up receiver from the terminal and then transmit a signal to the terminal indicating that the wake-up receiver is unusable. At this time, the terminal may transmit feedback to the base station indicating that it has received the signal indicating that the wake-up receiver is unusable. According to one embodiment of the present disclosure, the terminal may perform an operation according to parameters of the existing power saving method set by the base station using an existing power saving method (C-DRX or I-DRX such as paging).

[0188] According to various embodiments of the present disclosure, after a capability report of a terminal having a wake-up receiver and an indication procedure for whether the base station supports (or permits) the wake-up receiver, the wake-up receiver of the terminal may perform an operation of turning on the main radio of the terminal by receiving a wake-up signal. It should be understood that, according to one embodiment of the present disclosure, the terminal may independently / unrelatedly perform the operations of turning on the main radio and the operations of reporting the capability of the terminal having the wake-up receiver or receiving an indication from the base station regarding whether the wake-up receiver is supported. For example, even if the capability report operation and the authorization procedure of the terminal are not performed, the base station may transmit a signal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal to the terminal. Accordingly, even if the capability information related to the use of the wake-up receiver of the terminal and the authorization procedure for the same have not been performed, a terminal having a wake-up receiver among the terminals receiving a signal from the base station may perform turning on the main radio through the wake-up receiver.

[0189] According to one embodiment of the present disclosure, after the capability report operation of the terminal and the base station authorization procedure are performed, the operation of turning on / off the main radio through the wake-up receiver may be commonly applied to all terminals within the cell supported by the base station (e.g., RRC_CONNECTED terminals, RRC_IDLE / RRC_INACTIVE terminals, or terminals accessing the cell (e.g., RRC_CONNECTED terminals)). In addition, when the capability report operation of the terminal and the base station authorization procedure are not performed, the operation of turning on / off the main radio through the wake-up receiver may be applied to RRC_IDLE / RRC_INACTIVE terminals camping within the cell supported by the base station. In addition, various embodiments of the present disclosure may include at least one of all, part, or a combination of parts of various operations of a terminal and a base station including a wake-up receiver as disclosed below.

[0190] Hereinafter, an operation for turning on the main radio of a terminal having a wake-up receiver according to embodiments of the present disclosure is described. Embodiments of the present disclosure may include at least one of all, some, or a combination of various operations of a terminal and a base station including the wake-up receiver disclosed below.

[0191] According to one embodiment of the present disclosure, when the main radio of the terminal is in an on state, the terminal can receive a downlink signal (or data) from a base station through the main radio. According to various embodiments of the present disclosure, the main radio being 'on' may be expressed as the main radio being 'turned on' or the main radio being 'activated', and may have a similar or substantially equivalent meaning thereto. In addition, according to one embodiment of the present disclosure, the main radio being activated may mean that specific components of the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned on or activated, or may be defined by a standard (e.g., 3GPP TS document). However, according to various embodiments of the present disclosure, without being limited to the above, the main radio being activated may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto.

[0192] Alternatively, activation of the main radio may include the main radio performing reception operations on specific channels or signals defined in the 3GPP TS document (e.g., SS / PBCH blocks containing synchronization signals or PDCCHs containing downlink control channels).

[0193] According to one embodiment of the present disclosure, when the main radio of the terminal is off, the terminal may be considered to be in a sleep period, or the terminal may not receive a downlink signal (or data) from the base station. According to various embodiments of the present disclosure, the main radio being 'off' may be expressed as the main radio being 'turned off' or the main radio being 'deactivated', and may have a similar or substantially equivalent meaning thereto. According to one embodiment of the present disclosure, the main radio being deactivated may mean that specific components of the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned off or deactivated, or may be defined by a standard (e.g., 3GPP TS document). However, according to various embodiments of the present disclosure, without being limited to the above, the main radio being deactivated may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto. Alternatively, the main radio being disabled may mean that the main radio is no longer performing reception operations on specific channels or signals defined in the 3GPP TS document (e.g., SS / PBCH blocks containing synchronization signals or PDCCHs containing downlink control channels).

[0194] According to one embodiment of the present disclosure, a terminal having a wake-up receiver can receive a low-power synchronization signal (LP-SS) dedicated to the wake-up receiver or a PSS / SSS of an SS / PBCH block through the wake-up receiver. In this case, the PSS / SSS of the SS / PBCH block that the wake-up receiver can receive may refer to the PSS / SSS of an existing SS / PBCH block that the main radio can receive. A terminal having a wake-up receiver capable of receiving the signal can obtain time / frequency synchronization required for receiving the wake-up signal through not only the main radio but also the wake-up receiver. The wake-up receiver can receive at least one of the LP-SS and the PSS / SSS, or may not receive both the LP-SS and the PSS / SSS, depending on the terminal capability.

[0195] As described above, in order to save power consumption, the terminal triggers the main radio to turn on through the wake-up receiver only when a wake-up signal is received from the base station, so that the main radio can receive a downlink signal from the base station, and if the wake-up signal is not received, the terminal can turn off the main radio. At this time, the terminal in the RRC IDLE or RRC INACTIVE state may still need to perform serving cell (or camped cell) related measurements and evaluations separately from the on / off operations for the main radio. At this time, if the main radio is triggered for every DRX cycle to perform serving cell measurements and evaluations, a significant amount of the power consumption savings that can be achieved by using the wake-up receiver may be lost due to the transition energy of the main radio from off to on and the power required to perform synchronization, AGC (adaptive gain control), etc. to normally search for a downlink control channel in the on state. The present disclosure describes a method to solve this problem.

[0196] In describing the following embodiments, for convenience of explanation, operations or procedures expressed as being performed by the main radio or wake-up receiver for a terminal equipped with a wake-up receiver (i.e., a terminal having the capability of wake-up reception) may also be understood as being performed by the terminal equipped with the wake-up receiver (i.e., a terminal having the capability of wake-up reception).

[0197] According to one embodiment of the present disclosure, when a wake-up receiver is configured or activated and turned on (wake-up receiver is turned on) to detect a wake-up signal, and the main radio is turned off, the wake-up receiver of the terminal (or the terminal equipped with the wake-up receiver) can perform RRM measurement / evaluation instead of the existing RRM measurement / evaluation that the main radio of the terminal should perform. In this way, the RRM measurement / evaluation performed by the wake-up receiver of the terminal is hereinafter referred to as LR (LP-WUR, Lower Power Wake-Up Receiver) RRM measurement / evaluation. In addition, the RRM measurement / evaluation performed by the existing main radio is hereinafter referred to as MR (main radio, main receiver) RRM measurement / evaluation.

[0198] According to one embodiment of the present disclosure, when the main radio is off in every DRX cycle in which MR RRM measurement / evaluation should be performed, LR RRM measurement / evaluation may be performed instead. Alternatively, a cycle for LR RRM measurement / evaluation may be separately defined in the standard. For example, when a cycle for LR RRM measurement / evaluation is separately defined in the standard, when the main radio is off in a DRX cycle in which MR RRM measurement / evaluation should be performed, LR RRM measurement / evaluation may be performed at a time point for LR RRM measurement / evaluation that is set separately from the time point, rather than performing LR RRM measurement / evaluation instead of MR RRM at that time point. When a wake-up receiver of a terminal performs LR RRM measurement, the signal to be measured may be at least one of a PSS / SSS, an LP-SS, and a wake-up signal included in an existing SS / PBCH block.

[0199] As described above, when the main radio is off, the wake-up receiver is on, and the wake-up signal is detected, the main radio must still be activated every set DRX cycle for serving cell (or camped cell) related measurements. At this time, the state transition energy consumed by the existing operation where the main radio transitions from UDS (ultra deep sleep) to active state may exceed the power consumption savings. Experimental results show that when the main radio wakes up for serving cell measurements every M*N DRX cycles, no power consumption savings are obtained, and instead, power consumption increases. Here, M is a scaling factor applied to a specific condition, and N is a beam sweeping factor. In the following disclosure, unless otherwise specified, both M and N are assumed to be 1. Another experimental result shows that when the main radio wakes up every K DRX cycles and when K is greater than 1, a power consumption savings benefit can be obtained. That is, the lower the frequency at which the main radio wakes up, the more power consumption savings can be obtained. At this time, when K increases beyond a certain value (e.g., 8), a power consumption savings gain of approximately 40% was observed (i.e., as the value of K increases, the power consumption savings gain can increase). According to the above experimental results, serving cell measurement relaxation is essential for a terminal equipped with a wake-up receiver to obtain power consumption savings. Serving cell measurement relaxation refers to the case where K is greater than 1, in which the main radio wakes up every K DRX cycles to measure the serving cell. K can be referred to as a measurement relaxation factor. However, if the main radio performs serving cell measurement relaxation, the serving cell measurement accuracy and the performance of time / frequency synchronization acquisition may deteriorate.To address the performance degradation of serving cell measurement accuracy and time / frequency synchronization acquisition due to serving cell measurement relaxation, the wake-up receiver can perform serving cell measurements, and the main radio can simultaneously perform serving cell measurements with serving cell measurement relaxation applied. As a result, the terminal can obtain both power consumption savings and the time / frequency synchronization required for detection of the wake-up signal. Therefore, the following describes the criteria by which the main radio determines serving cell measurement relaxation, the criteria by which the wake-up receiver performs serving cell measurements, and the corresponding RRM measurement / evaluation method of the terminal.

[0200] FIG. 6 illustrates an example block diagram of a terminal performing wake-up signal detection when a wake-up receiver according to one embodiment of the present disclosure cannot perform LR RRM measurement / evaluation.

[0201] In operation 601, the main radio of the terminal may be turned on and the relevant upper layer settings for wake-up signal detection may be received from the network. The terminal may perform MR RRM measurement / evaluation while performing paging message detection, and the wake-up receiver may not perform wake-up signal detection. When the terminal performs MR RRM measurement / evaluation while performing paging message detection and the wake-up receiver does not perform wake-up signal detection, the terminal may fall into at least one of the following cases.

[0202] - If the terminal's wake-up receiver does not support LR RRM measurement / evaluation.

[0203] - If the wake-up receiver of the terminal supports LP-SS-based LR RRM measurement / evaluation, but LP-SS-related settings are not set from the network.

[0204] In the above case, the terminal will not be able to perform LR RRM measurement / evaluation. If the wakeup receiver of the terminal does not have the terminal capability to perform LR RRM measurement / evaluation, the wakeup receiver can detect the wakeup signal, but will not be able to measure or evaluate the PSS, SSS, or LP-SS included in the SS / PBCH block. In addition, the terminal can report the above capability to the network through the terminal capability report.

[0205] In operation 602, if the RSRP or RSRQ of the serving cell is greater than a specific threshold Th1 through MR RRM measurement / evaluation, the terminal may proceed to operation 603. If the RSRP or RSRQ of the serving cell is less than or equal to a specific threshold Th1, the terminal may proceed to operation 601 again, perform MR RRM measurement / evaluation, perform existing paging message detection, and the wake-up receiver may not perform wake-up signal detection.

[0206] In operation 603, the terminal can determine whether it meets the serving cell measurement relaxation criteria through MR RRM measurement / evaluation. The serving cell measurement relaxation requirements may include at least one of the following requirements:

[0207] - Satisfies the criteria for mitigating adjacent cell measurements with lowMobilityEvaluation set

[0208] - Satisfies the criteria for easing the measurement of adjacent cells that have been set for cellEdgeEvaluation

[0209] - Satisfying the criteria for easing adjacent cell measurement by simultaneously setting lowMobilityEvaluation and cellEdgeEvaluation

[0210] When the serving cell's RSRP or RSRQ exceeds a specific threshold Th2. In this case, the specific threshold Th2 may be the same as the threshold for operation 602 and Th1.

[0211] If at least one of the above requirements is met, the terminal may proceed to operation 604. If none of the above requirements is met, the terminal may proceed to operation 601 again to perform MR RRM measurement / evaluation while performing paging message detection, and the wake-up receiver may not perform wake-up signal detection.

[0212] In operation 604, the UE may have its wakeup receiver activated and turned on to detect a wakeup signal and its main radio may be off. At this time, the UE may apply serving cell measurement relaxation to measure the serving cell with the main radio every KDRX cycle. The measurement relaxation factor K may be a number greater than 1. K may be at least one of a fixed value in the specification, a value set by the network, or a value determined by the UE implementation. The value of K may not be limited, but may have a value less than or equal to the fixed number X in the specification. The UE may return to operation 602 / 603 at regular intervals to evaluate the serving cell status of the UE and determine whether to maintain operation 604 or return to operation 601.

[0213] FIG. 7 illustrates an example block diagram of a terminal performing wake-up signal detection and determining serving cell measurement relaxation when a wake-up receiver according to an embodiment of the present disclosure is capable of performing LR RRM measurement / evaluation.

[0214] In operation 701, the main radio of the terminal may be turned on and receive related upper layer settings for wake-up signal detection from the network. The terminal may perform MR RRM measurement / evaluation while performing paging message detection, and the wake-up receiver may not perform wake-up signal detection. At this time, the wake-up receiver of the terminal may be able to support LR RRM measurement / evaluation. If the wake-up receiver has the terminal capability to perform LR RRM measurement / evaluation, the wake-up receiver may be able to detect the wake-up signal and measure or evaluate at least one of the PSS / SSS or LP-SS included in the SS / PBCH block. In addition, the terminal may report to the network the wake-up receiver's LR RRM measurement / evaluation capability and at least one of the PSS / SSS or LP-SS measurement capability in the terminal capability report.

[0215] In step 702, if the RSRP or RSRQ of the serving cell is greater than a specific threshold Th1 through MR RRM measurement / evaluation, the UE may proceed to step 703. If the RSRP or RSRQ of the serving cell is less than or equal to a specific threshold Th1, the UE may proceed to step 701 again to perform MR RRM measurement / evaluation while performing paging message detection, and the wake-up receiver may not perform wake-up signal detection.

[0216] In operation 703, the terminal may activate and turn on the wakeup receiver to detect the wakeup signal, and the main radio may be turned off. The terminal may proceed to operation 704 to determine the RRM measurement / evaluation method of the main radio and wakeup receiver.

[0217] In operation 704, the terminal may activate and turn on the wake-up receiver to detect the wake-up signal and perform LR RRM measurement / evaluation, and the main radio may be turned off. In operation 704, the terminal may determine a serving cell measurement / evaluation method based on at least one of the measurement values ​​of the main radio and the measurement values ​​of the wake-up receiver. If the terminal has not previously performed operation 705 or 706, or has just started detecting the wake-up signal, at least one of the following serving cell measurement / evaluation operations may be performed.

[0218] - The terminal performs serving cell measurement / evaluation with the wake-up receiver in operation 705.

[0219] - The terminal performs serving cell measurement / evaluation with the wake-up receiver in operation 706 while simultaneously performing serving cell measurement / evaluation with the main radio.

[0220] - The terminal performs serving cell measurement / evaluation of operation 705 or operation 706 according to the terminal capability report.

[0221] - The terminal receives upper layer settings from the network and performs serving cell measurement / evaluation of operation 705 or operation 706.

[0222] - If the RSRP or RSRQ of the main radio is greater than a specific threshold Th3, the terminal performs operation 705, otherwise it performs operation 706 (the threshold may be different from the threshold of operation 702).

[0223] In operation 704, the terminal may perform operation 705 or operation 706 and then move to operation 706 or operation 705 if certain conditions (710, 720) are satisfied. For example, if condition 720 is satisfied while performing operation 705, operation 706 may be performed. Alternatively, if condition 710 is satisfied while performing operation 706, operation 705 may be performed. The terminal may periodically move to operation 707 while performing operation 705 or 706 to perform serving cell evaluation.

[0224] In operation 705, the terminal may activate and turn on the wake-up receiver to detect the wake-up signal and perform LR RRM measurement / evaluation, and the main radio may be turned off. In this operation, the serving cell measurement / evaluation may be performed with the wake-up receiver, and the serving cell measurement / evaluation may not be performed with the main radio. In operation 705, if the terminal satisfies condition 720, the terminal may proceed to operation 706. Condition 720 may include at least one of the following cases.

[0225] - When the RSRP or RSRQ change amount of the wake-up receiver is equal to or greater than a specific threshold Th4 for a specific time T4.

[0226] ○ For example, if (RSRPref - RSRP) >= THRSRP, then RSRPref is the reference RSRP, RSRP is the RSRP of the current wake-up receiver, and THRSRP is the threshold.

[0227] ○ For example, if the wake-up receiver is activated for the first time and measures the serving cell, if the current RSRP is greater than RSRPref, and if the terminal has moved from operation 705, then RSRPref uses the RSRP value measured by the current wake-up receiver.

[0228] ○ The above specific time T4 and specific threshold Th4 may differ from those in operation 702.

[0229] - Specific timer T of the wakeup receiver long If this expires or becomes 0

[0230] ○ T long can be initialized when the 705 operation starts

[0231] ○ T long The initial value can be set by the network as a higher layer setting, or the terminal can set it as an implementation below the maximum value set by the network as a higher layer signaling.

[0232] - When the terminal's mobility status is at least one of medium and high (where Nmedium is the maximum number of reselected cells to enter the medium mobility status, and Nhigh is the maximum number of reselected cells to enter the high mobility status).

[0233] ○ If the mobile status of the terminal is medium, the cell re-selected by the terminal is N for a certain period of time T5. medium Greater than or equal to N high If less than or equal to

[0234] ○ If the mobile status of the terminal is high, the cell re-selected by the terminal is N for a certain period of time T5. high If it is greater than

[0235] - When the RSRP or RSRQ of the wake-up receiver is less than or equal to a specific threshold Th6 for a specific time T6.

[0236] In operation 706, the terminal may activate and turn on the wake-up receiver to detect the wake-up signal and perform LR RRM measurement / evaluation, and the main radio may be turned off. In this operation, the terminal may perform serving cell measurement / evaluation with the wake-up receiver while simultaneously performing serving cell measurement / evaluation with the main radio. At this time, at least one of the following methods may be included for performing serving cell measurement / evaluation with the main radio.

[0237] - The main radio can apply serving cell measurement relaxation if the wakeup receiver detects the wakeup signal.

[0238] - The main radio can apply serving cell measurement relaxation if at least one of the following criteria is satisfied.

[0239] ○Adjacent cell measurement relaxation criteria satisfied with lowMobilityEvaluation setting

[0240] Satisfies the relaxation criteria for adjacent cell measurement set by cellEdgeEvaluation

[0241] ○ Satisfaction of the relaxation criteria for adjacent cell measurement that has both lowMobilityEvaluation and cellEdgeEvaluation set simultaneously

[0242] ○ When the RSRP or RSRQ measured by the wake-up receiver is below a certain threshold value Th relax If it is greater than

[0243] A terminal that applies serving cell measurement relaxation can measure the serving cell with the main radio every K DRX cycles. The measurement relaxation factor K can be a number greater than 1. K can be at least one of a value fixed in the specification, a value set by the network, or a value determined by the terminal implementation. The value of K may not be limited, but may have a value less than or equal to a number Y fixed in the specification. Alternatively, K can have a value greater than X and less than Y. The value X can share the same value as the value X defined in operation 704. Y can be expected to have a value greater than X. In operation 706, if the terminal satisfies condition 710, it can proceed to operation 705. Condition 710 may include at least one of the following cases:

[0244] - When the RSRP or RSRQ change amount of the wake-up receiver is less than a specific threshold Th4 for a specific time T4.

[0245] ○ For example (RSRP ref - RSRP) < TH RSRP If so, then RSRP ref is the reference RSRP, RSRP is the RSRP of the current wake-up receiver, and TH RSRP is the threshold.

[0246] ○ For example, if the wake-up receiver is activated for the first time and measures the serving cell, the current RSRP is RSRP ref If greater than or equal to 706, and if at least one of the terminals has moved from operation 706, RSRP ref Uses the RSRP value currently measured by the wakeup receiver.

[0247] ○ The above specific time T4 and specific threshold Th4 may differ from those in operation 702.

[0248] - Specific timer T of the wakeup receiver long If this expires or becomes 0

[0249] ○ T long can be initialized when step 706 starts

[0250] ○ T long The initial value can be set by the network as a higher layer setting, or the terminal can set it as an implementation value less than or equal to the maximum value set by the network as a higher layer signaling.

[0251] - When the terminal's movement status is at least one of normal and medium (where Nmedium is the maximum number of reselected cells to enter the medium movement status, and Nhigh is the maximum number of reselected cells to enter the high movement status).

[0252] ○ If the terminal's movement status is normal, the cell re-selected by the terminal is N for a certain period of time T5. medium If it is smaller than

[0253] ○ If the mobile status of the terminal is medium, the cell re-selected by the terminal is N for a certain period of time T5. medium Greater than or equal to N high If less than or equal to

[0254] - When the RSRP or RSRQ of the wake-up receiver is greater than a specific threshold Th6 for a specific time T6.

[0255] - If the RSRP or RSRQ value of the wake-up receiver maintains a certain accuracy.

[0256] ○ For example, the terminal measures the difference between the measurement value of the wake-up receiver and the measurement value of the main radio at a specific threshold value. accuracy and if the difference in the above measurement values ​​is maintained for a specific time T7, it can be judged that the accuracy is maintained.

[0257] In step 707, the UE may decide to maintain wakeup signal detection based on the RSRP or RSRQ of the serving cell through LR RRM measurement / evaluation. If the RSRP or RSRQ of the serving cell of the wakeup receiver is greater than a specific threshold Th8, the UE may return to step 704. When returning to step 704, the previously performed measurement / evaluation may be continued. If the RSRP or RSRQ of the serving cell is less than or equal to a specific threshold Th8, the UE may proceed to step 701, where the main radio is turned on and MR RRM measurement / evaluation is performed while performing paging message detection, and the wakeup receiver may not perform wakeup signal detection.

[0258] When the terminal performs MR RRM measurement / evaluation, N serv If the UE determines that the serving cell does not satisfy the cell selection criterion S during consecutive DRX cycles, the UE starts measuring all neighboring cells indicated by the serving cell regardless of the measurement activity of the UE.

[0259] In one embodiment, when the serving cell measurement relaxation of the main radio is set, the terminal will be required to measure the serving cell at least every K DRX cycles (K>1). In this situation, the terminal may determine the cell selection criterion S of the serving cell by using N serv If evaluation is performed during consecutive DRX cycles, the serving cell can be evaluated every K DRX cycles by relaxing the serving cell measurement. In this situation, if the terminal has fast mobility or K is very large, the evaluation accuracy may decrease due to the change in the link quality of the serving cell and the mismatch in the measurement interval. In this disclosure, a method for solving this problem when the serving cell measurement relaxation of the main radio is configured will be described.

[0260] According to one embodiment, when a terminal performs MR RRM measurement / evaluation, it may be requested to measure a serving cell at least once per K DRX cycle.

[0261] FIG. 8 illustrates an example of a case where a main radio, according to one embodiment of the present disclosure, applies serving cell measurement relaxation and performs MR RRM measurement / evaluation. A terminal applying serving cell measurement relaxation may apply at least one of the following methods for performing MR RRM measurement / evaluation.

[0262] - Method 1) According to one embodiment of the present disclosure, the terminal may be requested to measure the serving cell at least once per K DRX cycles. For example, if K=3 and the terminal measured 801 in DRX cycle #0, it may be requested to measure 802 in DRX cycle #3, and measure 803 in DRX cycle #6.

[0263] - Method 2) According to one embodiment, the terminal may be requested to measure the serving cell at least once for every K DRX cycle during consecutive N DRX cycles (811). The terminal may be requested to measure the serving cell at least once for every DRX cycle within the consecutive N DRX cycles (811). In this case, N is N for determining the cell selection decision criterion S. serv It may be a value set in a higher layer. The method for determining the criteria by which the terminal counts K DRX cycles may include at least one of the following.

[0264] ○ Method 2-1) According to one embodiment, the terminal may be requested to initiate measurement every K DRX cycles starting from the first DRX cycle of N consecutive DRX cycles (811). For example, if the terminal is set to K=3 and N=2, and measures 812 and 813 in consecutive DRX cycles #0 and #1, the terminal may be requested to perform measurement at least once in consecutive DRX cycles #3 (a value obtained by adding 3 to cycle #0, which is the last cycle of the previous consecutive DRX cycles), #4, and consecutive DRX cycles #6 (a value obtained by adding 3 to cycle #3, which is the last cycle of the previous consecutive DRX cycles), #7.

[0265] ○ Method 2-2) According to one embodiment, the terminal may be requested to initiate measurement every K DRX cycles starting from the last DRX cycle of N consecutive DRX cycles (811). For example, if the terminal is set to K=3 and N=2, and measures 812 and 813 in consecutive DRX cycles #0 and #1, the terminal may be requested to perform measurement at least once in consecutive DRX cycles #4 (a value obtained by adding 3 to cycle #1, which is the last DRX cycle among the previous consecutive DRX cycles), #5, and consecutive DRX cycles #8 (a value obtained by adding 3 to cycle #5, which is the last DRX cycle among the previous consecutive DRX cycles), #9.

[0266] According to one embodiment of the present disclosure, if Method 2 is applied when the serving cell measurement relaxation factor of the terminal is sufficiently small, the power consumption reduction benefit that can be obtained by the measurement relaxation may be reduced. Therefore, it is necessary to adaptively apply Methods 1 and 2 as appropriate according to the serving cell measurement relaxation factor. If the terminal applies the serving cell measurement relaxation when performing MR RRM measurement / evaluation, Method 1 may be applied if the serving cell measurement relaxation factor K is less than or equal to a specific value Z. If the serving cell measurement relaxation factor K is greater than a specific value Z, Method 2 may be applied. In this case, the specific value Z may be a value fixed in the standard or a value set by the network as a higher layer. And the specific value Z may be a value greater than N (811).

[0267] According to one embodiment of the present disclosure, a terminal may perform LR RRM measurement / evaluation when the wake-up receiver is activated and turned on to detect a wake-up signal, and the main radio may be turned off. At this time, the terminal may perform serving cell measurement / evaluation with the wake-up receiver while simultaneously applying serving cell measurement relaxation to the main radio to perform serving cell measurement / evaluation. In this case, the terminal may encounter cases where the main radio and the wake-up receiver perform measurements simultaneously (or in the same symbol or slot). Depending on the terminal's capabilities, some terminals may not be able to process measurements simultaneously with the main radio and the wake-up receiver. In this situation, the terminal may prioritize measurements of the main radio that can be obtained over a long period. If the measurements of the main radio that can be obtained over a long period are not prioritized, the terminal may have to wait until the next period to obtain measurements of the main radio, which may make it difficult to make an accurate decision based on the serving cell measurement / evaluation. Therefore, the terminal may be required to prioritize the main radio (or drop measurements via the wake-up receiver) if the main radio and the wake-up receiver need to make measurements at the same time (or in the same symbol, same slot).

[0268] FIG. 9 is a block diagram illustrating the functional structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0269] Referring to FIG. 9, the terminal may include a terminal receiving unit (900), a terminal transmitting unit (910), and a terminal processing unit (control unit) (905).

[0270] The terminal receiving unit (900) and the terminal transmitting unit (910) may be collectively referred to as a transceiver. Depending on the communication method of the terminal described above, the terminal receiving unit (900), the terminal transmitting unit (910), and the terminal processing unit (905) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components (e.g., memory, etc.) than the components described above. In addition, the terminal receiving unit (900), the terminal transmitting unit (910), and the terminal processing unit (905) may be implemented in the form of a single chip.

[0271] The terminal receiving unit (900) and the terminal transmitting unit (910) (or, transceiver) can transmit and receive signals with a base station. Here, the signals can include control information and data. To this end, the transceiver can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0272] In addition, the transceiver can receive a signal through a wireless channel and output it to the terminal processing unit (905), and transmit a signal output from the terminal processing unit (905) through the wireless channel.

[0273] Memory (not shown) can store programs and data necessary for the operation of the terminal. Furthermore, the memory can store control information or data included in signals acquired from the terminal. The memory may be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media.

[0274] The terminal processing unit (905) can control a series of processes so that the terminal can operate according to the embodiments of the present disclosure described above. The terminal processing unit (905) can be implemented as a control unit or one or more processors.

[0275] FIG. 10 is a block diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0276] Referring to FIG. 10, the base station may include a base station receiving unit (1000), a base station transmitting unit (1010), and a base station processing unit (control unit) (1005).

[0277] The base station receiving unit (1000) and the base station transmitting unit (1010) may be collectively referred to as a transceiver. Depending on the communication method of the base station described above, the base station receiving unit (1000), the base station transmitting unit (1010), and the base station processing unit (1005) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components (e.g., memory, etc.) than the components described above. In addition, the base station receiving unit (1000), the base station transmitting unit (1010), and the base station processing unit (1005) may be implemented in the form of a single chip.

[0278] The base station receiving unit (1000) and the base station transmitting unit (1010) (or, transmitting and receiving unit) can transmit and receive signals with the terminal. Here, the signals can include control information and data. To this end, the transmitting and receiving unit can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transmitting and receiving unit, and the components of the transmitting and receiving unit are not limited to the RF transmitter and RF receiver.

[0279] In addition, the transceiver unit can receive a signal through a wireless channel and output it to the base station processing unit (1005), and transmit the signal output from the base station processing unit (1005) through the wireless channel.

[0280] Memory (not shown) can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data contained in signals acquired from the base station. The memory may be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media.

[0281] The base station processing unit (1005) can control a series of processes so that the base station can operate according to the embodiments of the present disclosure described above. The base station processing unit (1005) can be implemented as a control unit or one or more processors.

[0282] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0283] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0284] In addition, the method of the present disclosure may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the disclosure.

[0285] Additionally, although not disclosed in the present disclosure, a method in which a separate table or information including at least one component included in the table proposed in the present disclosure is used is also possible.

[0286] Meanwhile, the embodiments of the present disclosure disclosed in this disclosure and the drawings are merely specific examples presented to easily explain the technical content of the present disclosure and aid in understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art to which the present disclosure pertains that other modified examples based on the technical concepts of the present disclosure are possible. Furthermore, the above-described embodiments can be combined and operated as needed.

Claims

1. In a method performed by a terminal of a wireless communication system, A step of receiving setup information related to searching for a wake-up signal from a base station; A step of activating the wake-up receiver of the terminal based on the above setting information; A step of performing measurement of a serving cell through the wake-up receiver; and A step of identifying whether a first measurement value of the serving cell through the wake-up receiver is greater than a first threshold value, A method wherein the terminal includes a main radio and the wake-up receiver.

2. In the first paragraph, the method, If the first measurement value is greater than the first threshold value, the step of performing measurement of the serving cell through the main radio of the terminal is further included. A method wherein the measurement of the serving cell by the main radio is subject to serving cell measurement relaxation.

3. In paragraph 2, The above serving cell measurement relaxation is that the main radio wakes up at a cycle that is K times the DRX (discontinuous reception) cycle, A method wherein the above K is a positive integer greater than 1.

4. In paragraph 1, The first measurement value includes at least one of RSRP (reference signals received power) or RSRQ (reference signals received quality), or A method, wherein the first measurement value includes at least one of a change in the RSRP or a change in the RSRQ.

5. In the first paragraph, the step of activating the wake-up receiver of the terminal is as follows: A step of performing measurement of the serving cell through the main radio; A step of identifying whether the second measurement value of the serving cell through the main radio is greater than a second threshold value; and A method comprising the step of activating the wake-up receiver when the second measurement value is greater than the second threshold value.

6. In paragraph 5, A method wherein the second measurement value comprises at least one of RSRP or RSRQ.

7. In the first paragraph, the method, A method further comprising the step of transmitting terminal capability information regarding measurement of the serving cell of the wake-up receiver to the base station.

8. In paragraph 1, A method wherein the above wake-up receiver is a LP-WUR (lower power wake-up receiver).

9. In a wireless communication system, at the terminal: transceiver; and comprising at least one processor coupled to the transceiver; At least one processor of the above: Receives configuration information related to the search for a wake-up signal from a base station, Based on the above setting information, activate the wake-up receiver of the terminal, Perform measurement of the serving cell through the above wake-up receiver, and Identify whether the first measurement value of the serving cell through the wake-up receiver is greater than a first threshold value, A terminal comprising a main radio and a wake-up receiver.

10. In paragraph 9, the at least one processor: If the first measurement value is greater than the first threshold value, it is further set to perform measurement of the serving cell through the main radio of the terminal, A terminal in which measurement of the serving cell by the main radio is subject to serving cell measurement relaxation.

11. In paragraph 10, The above serving cell measurement relaxation is that the main radio wakes up at a cycle that is K times the DRX (discontinuous reception) cycle, The terminal, wherein the above K is a positive integer greater than 1.

12. In paragraph 9, The first measurement value includes at least one of RSRP (reference signals received power) or RSRQ (reference signals received quality), or A terminal, wherein the first measurement value includes at least one of a change in the RSRP or a change in the RSRQ.

13. In paragraph 9, the at least one processor: Perform measurements of the serving cell via the main radio, Identify whether the second measurement value of the serving cell through the main radio is greater than the second threshold value, If the second measurement value is greater than the second threshold value, the wake-up receiver is set to be activated, and the terminal.

14. In paragraph 13, A terminal, wherein the second measurement value includes at least one of RSRP or RSRQ.

15. In paragraph 9, the at least one processor: The base station is further configured to transmit terminal capability information regarding measurement of the serving cell of the wake-up receiver, A terminal wherein the above wake-up receiver is a LP-WUR (lower power wake-up receiver).

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