Method and device for measuring neighbor cell by terminal having wake-up receiver in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal according to an embodiment of the present disclosure may comprise the steps of: receiving, via higher-layer signaling, a first configuration related to a low-power wake-up signal and a second configuration related to a measurement alignment window; on the basis of the first configuration, performing measurement on the low-power wake-up signal through a low-power wake-up receiver of the terminal; on the basis of the measurement on the low-power wake-up signal, identifying whether to trigger radio resource management (RRM) measurement based on a main radio (MR) of the terminal; and when triggering of RRM measurement based on the MR of the terminal is identified, performing RRM measurement based on the MR of the terminal within the measurement alignment window on the basis of the second configuration.

Description

Method and device for measuring neighboring cells of a terminal having a wake-up receiver in a wireless communication system

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

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

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

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

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

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

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

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

[0010] The technical problems to be achieved in various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from various embodiments of the present disclosure described below.

[0011] A method performed by a terminal according to one embodiment of the present disclosure may include: receiving, through upper layer signaling, a first configuration related to a low-power wake-up signal and a second configuration related to a measurement alignment window; performing a measurement on the low-power wake-up signal through a low-power wake-up receiver of the terminal based on the first configuration; identifying whether to trigger a radio resource management (RRM) measurement based on an MR (main radio) of the terminal based on the measurement on the low-power wake-up signal; and performing an RRM measurement based on an MR of the terminal within the measurement alignment window based on the second configuration when triggering of an RRM measurement based on an MR of the terminal is identified.

[0012] According to one embodiment of the present disclosure, the step of identifying whether the RRM measurement based on the MR of the terminal is triggered includes at least one of: identifying that the RRM measurement based on the MR of the terminal is triggered when the received signal received power (RSRP) or the received signal received quality (RSRQ) corresponding to the low power-wake-up signal is less than or equal to a first threshold for a first time interval; or identifying that the RRM measurement based on the MR of the terminal is triggered when the sum of a value to which a first scaling factor is applied to the RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied to the RSRP or RSRQ corresponding to a reference signal received through the MR of the terminal is less than or equal to a second threshold for a second time interval; wherein the sum of the first scaling factor and the second scaling factor may be 1.

[0013] According to one embodiment of the present disclosure, the method further includes a step of identifying whether to stop RRM measurement based on MR of the terminal, wherein the step of identifying whether to stop RRM measurement based on MR of the terminal includes at least one of: identifying that RRM measurement based on MR of the terminal is to be stopped when RSRP or RSRQ corresponding to the low power-wake-up signal exceeds a first threshold during a first time interval; or identifying that RRM measurement based on MR of the terminal is to be stopped when a sum of a value to which a first scaling factor is applied to RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied to RSRP or RSRQ corresponding to a reference signal received through MR of the terminal is less than or equal to a second threshold during a second time interval; and wherein the sum of the first scaling factor and the second scaling factor may be 1.

[0014] According to one embodiment of the present disclosure, the RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal,

[0015] The measurement alignment window is a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and the relaxed serving cell measurement based on the MR of the terminal, and the second setting includes information about a size of the measurement alignment window and information about a period of the measurement alignment window, and the size of the measurement alignment window can be set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

[0016] According to one embodiment of the present disclosure, the relaxed peripheral cell measurement may be based on a peripheral cell measurement relaxation factor, wherein the peripheral cell measurement relaxation factor may be based on one or more of: determining the same as a serving cell measurement relaxation factor; determining the same as a maximum or minimum value among specific values ​​for the serving cell measurement relaxation factor and the peripheral cell measurement relaxation factor; determining the same as a result of comparing a change in RSRP or RSRQ corresponding to the low power-wake-up signal with a third threshold during a third time interval; or determining the same as a result of comparing RSRP or RSRQ corresponding to the low power-wake-up signal with a fourth threshold during a fourth time interval.

[0017] A terminal of a communication system according to one embodiment of the present disclosure comprises a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive, through upper layer signaling, a first configuration related to a low-power wake-up signal and a second configuration related to a measurement alignment window; perform measurement on the low-power wake-up signal through a low-power wake-up receiver of the terminal based on the first configuration; identify whether to trigger RRM (radio resource management) measurement based on MR (main radio) of the terminal based on the measurement on the low-power wake-up signal; and, when triggering of RRM measurement based on MR of the terminal is identified, perform RRM measurement based on MR of the terminal within the measurement alignment window based on the second configuration.

[0018] According to one embodiment of the present disclosure, in identifying whether the RRM measurement based on the MR of the terminal is triggered, the processor is set to at least one of: identifying that the RRM measurement based on the MR of the terminal is triggered when the received signal received power (RSRP) or the received signal received quality (RSRQ) corresponding to the low power-wake-up signal is less than or equal to a first threshold for a first time interval; or identifying that the RRM measurement based on the MR of the terminal is triggered when the sum of a value to which a first scaling factor is applied to the RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied to the RSRP or RSRQ corresponding to a reference signal received through the MR of the terminal is less than or equal to a second threshold for a second time interval; and the sum of the first scaling factor and the second scaling factor may be 1.

[0019] According to one embodiment of the present disclosure, the processor is configured to identify whether to stop RRM measurement based on MR of the terminal, and in identifying whether to stop RRM measurement based on MR of the terminal, the processor is configured to: identify to stop RRM measurement based on MR of the terminal when RSRP or RSRQ corresponding to the low power-wake-up signal exceeds a first threshold for a first time interval; or identify to stop RRM measurement based on MR of the terminal when a sum of a value to which a first scaling factor is applied to RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied to RSRP or RSRQ corresponding to a reference signal received through MR of the terminal is less than or equal to a second threshold for a second time interval; and the sum of the first scaling factor and the second scaling factor may be 1.

[0020] According to one embodiment of the present disclosure, the RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, and the measurement alignment window is a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and a relaxed serving cell measurement based on the MR of the terminal, and the second configuration includes information about a size of the measurement alignment window and information about a period of the measurement alignment window, and the size of the measurement alignment window can be set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

[0021] According to one embodiment of the present disclosure, the relaxed peripheral cell measurement may be based on a peripheral cell measurement relaxation factor, wherein the peripheral cell measurement relaxation factor may be based on one or more of: determining the same as a serving cell measurement relaxation factor; determining the same as a maximum or minimum value among specific values ​​for the serving cell measurement relaxation factor and the peripheral cell measurement relaxation factor; determining the same as a result of comparing a change in RSRP or RSRQ corresponding to the low power-wake-up signal with a third threshold during a third time interval; or determining the same as a result of comparing RSRP or RSRQ corresponding to the low power-wake-up signal with a fourth threshold during a fourth time interval.

[0022] A method performed by a base station in a communication system according to one embodiment of the present disclosure may include: obtaining a first configuration related to a low-power wake-up signal for a low-power wake-up receiver of a terminal; obtaining a second configuration related to a measurement alignment window for radio resource management (MR)-based measurement of the terminal; transmitting the first configuration and the second configuration to the terminal via upper layer signaling; and transmitting the low-power wake-up signal to the terminal.

[0023] According to one embodiment of the present disclosure, the RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, and the measurement alignment window may be a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and a relaxed serving cell measurement based on the MR of the terminal.

[0024] According to one embodiment of the present disclosure, the second setting includes information about a size of the measurement alignment window and information about a period of the measurement alignment window, and the size of the measurement alignment window can be set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

[0025] A base station of a communication system according to one embodiment of the present disclosure comprises a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: obtain a first configuration related to a low-power wake-up signal for a low-power wake-up receiver of a terminal; obtain a second configuration related to a measurement alignment window for a (radio resource management) measurement based on MR (main radio) of the terminal; transmit the first configuration and the second configuration to the terminal through upper layer signaling; and transmit the low-power wake-up signal to the terminal.

[0026] According to one embodiment of the present disclosure, the RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, and the measurement alignment window is a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and a relaxed serving cell measurement based on the MR of the terminal, and the second configuration includes information about a size of the measurement alignment window and information about a period of the measurement alignment window, and the size of the measurement alignment window can be set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

[0027] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0028] By providing a method and device for measuring cell signal quality and selecting a cell 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.

[0029] The effects that can be obtained from various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0030] Figure 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system.

[0031] Figure 2 illustrates the time domain mapping structure and beam sweeping operation of a synchronization signal.

[0032] Figure 3 illustrates the flow of signals for random access (RA).

[0033] Figure 4 illustrates the flow of signals for a terminal to report terminal capability information to a base station.

[0034] 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.

[0035] FIG. 6 illustrates an example of a method for triggering neighboring cell measurement / detection when a wake-up receiver monitors a wake-up signal according to an embodiment of the present disclosure.

[0036] FIG. 7 illustrates an example of a method for stopping neighboring cell measurement / detection when a wake-up receiver monitors a wake-up signal according to an embodiment of the present disclosure.

[0037] FIG. 8 illustrates an example of a method for a terminal to perform RRM measurement / detection in a wireless communication system according to one embodiment of the present disclosure.

[0038] FIG. 9 is a block diagram illustrating the functional structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0039] FIG. 10 is a block diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0040] 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.

[0041] In describing the embodiments of this disclosure, descriptions of technical details that are well known in the technical field to which this disclosure pertains and are not directly related to this disclosure will be omitted. This is to ensure that the gist of this disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0042] 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.

[0043] 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 specification.

[0044] 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).

[0045] 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.

[0046] 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.

[0047] 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.

[0048]

[0049] 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.

[0050] 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."

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Figure 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system.

[0060] Figure 1 is a diagram showing the basic structure of a time-frequency resource area, which is a radio resource area in which data or control channels of a 5G system are transmitted.

[0061] 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 single 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 can be composed of a total of NBW (104) subcarriers.

[0062] 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 B = 12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] [Table 1] below shows the relationship between the subcarrier spacing configuration (μ), subcarrier spacing (Δf), and CP length supported in the 5G system.

[0068] [Table 1]

[0069]

[0070] [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.

[0071] [Table 2]

[0072]

[0073] [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.

[0074] [Table 3]

[0075]

[0076] 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).

[0077] 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.

[0078] 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.

[0079] The frame structure can be applied to correspond 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] Figure 2 illustrates the time domain mapping structure and beam sweeping operation of a synchronization signal.

[0084] Hereinafter, the following components may be predefined for the purpose of explaining the present disclosure.

[0085] - PSS (primary synchronization signal): A signal that serves as the basis for DL ​​time / frequency synchronization and can provide some cell ID information.

[0086] - 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.

[0087] - 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.

[0088] - 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.

[0089] 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).

[0090] 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.

[0091] 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.

[0092] FIG. 3 illustrates a signal flow for performing random access (RA). FIG. 3 illustrates an example of a random access procedure, and the present disclosure is not limited thereto. In addition, the present disclosure is not limited to the 4-step random access procedure illustrated in FIG. 3, and can also be applied to a 2-step random access procedure (transmitting and receiving message A (a message including information corresponding to message 1 and message 3) and transmitting and receiving message B (a message including information corresponding to message 2 and message 4)).

[0093] 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.

[0094] 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.

[0095] 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).

[0096] 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.

[0097] 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).

[0098] 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.

[0099] 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 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 UE capability information reported by each terminal to the base station may have different values ​​for each terminal.

[0100] For example, a terminal may report terminal capability information including at least one of the following control information to a base station.

[0101] - Control information related to frequency bands supported by the terminal

[0102] - Control information related to channel bandwidth supported by the terminal

[0103] - Control information related to the maximum modulation method supported by the terminal

[0104] - Control information related to the maximum number of beams supported by the terminal

[0105] - Control information related to the maximum number of layers supported by the terminal

[0106] - Control information related to CSI reporting supported by the terminal

[0107] - Control information on whether the terminal supports frequency hopping

[0108] - Bandwidth-related control information when supporting carrier aggregation (CA)

[0109] - Control information on whether cross carrier scheduling is supported when carrier aggregation is supported.

[0110]

[0111] Figure 4 illustrates the flow of signals for a terminal to report terminal capability information to a base station.

[0112] 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).

[0113] 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.

[0114] - Performs terminal-specific DRX (discontinuous reception) cycles set by the upper layer.

[0115] - Receive paging messages from the core network

[0116] - Obtain system information

[0117] - Measurement actions related to serving cells (or camping cells) and cell selection / reselection

[0118] - Measurement operations related to surrounding cells and cell reselection

[0119] 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.

[0120] N1 can be determined by the following table.

[0121] [Table 4]

[0122]

[0123] The cell selection criterion S corresponds to SS-RSRP rxlev > 0 and S corresponding to SS-RSRQ qual > 0 can be satisfied.

[0124] S rxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset )- P compensation - Q offsettemp

[0125] S qual = Q qualmeas - (Q qualmin + Q qualminoffset ) - Q offsettemp

[0126] Here, Q rxlevmeasis 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.

[0127] 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).

[0128] Terminal is N serv Even if the serving cell satisfies the cell selection criterion S during consecutive DRX cycles, if the network has set inter-frequency layers of higher priority, the UE must search for cells of that frequency layer at least every Thigher_prioirty_search. If the UE servIf the serving cell does not satisfy the cell selection criterion S during consecutive DRX cycles and the network sets inter-frequency layers of lower, higher priority, the terminal may search for lower, same, and higher frequency layer cells as in the measurement cycle described below.

[0129] The terminal starts measuring the surrounding cells every T measure Measure the SS-RSRP and SS-RSRQ levels every T and the surrounding cells evaluate 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.

[0130] 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.

[0131] R s = Q meas,s + Q hyst- Qoffset temp

[0132] R n = Q meas,n - Qoffset - Qoffset temp

[0133] 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.

[0134] 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 surrounding 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.

[0135] 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:

[0136] - Storage of AS (access stratum) information required for cell access

[0137] - Terminal-specific DRX cycle operation set by the RRC layer

[0138] - Setting up and periodically updating RNA (RAN (radio access network)-based notification area) that can be utilized during handover by the RRC layer

[0139] - Monitoring of RAN-based paging messages transmitted via I-RNTI (inactive-radio network temporary identifier)

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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).

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] [Table 5]

[0149]

[0150]

[0151] 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.

[0152] 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.

[0153] [Table 6]

[0154]

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] [Table 7]

[0160]

[0161]

[0162] 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.

[0163] 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.

[0164] 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.

[0165] - 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

[0166] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0167] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0168] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0169] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0170] 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.

[0171] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0172] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0173] 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.

[0174] - C-RNTI (cell RNTI): For terminal-specific PDSCH or PUSCH scheduling purposes.

[0175] - TC-RNTI (temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0176] - CS-RNTI (configured scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0177] - RA-RNTI (random access RNTI): Used for PDSCH scheduling in the random access phase.

[0178] - P-RNTI (paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0179] - SI-RNTI (system information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0180] - INT-RNTI (interruption RNTI): Used to indicate whether puncturing is performed on the PDSCH.

[0181] - TPC-PUSCH-RNTI (transmit power control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0182] - TPC-PUCCH-RNTI (transmit power control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0183] - TPC-SRS-RNTI (transmit power control for SRS RNTI): Used to indicate power control commands for SRS (sounding reference signal).

[0184] The DCI formats described above can follow the definitions shown in [Table 8] below.

[0185] [Table 8]

[0186]

[0187] CORESET p, the search space of aggregation level L in the search space set s can be expressed as the following mathematical formula.

[0188] [Mathematical Formula 1]

[0189]

[0190] - L: Integration level

[0191] - : Carrier index

[0192] - : Total number of CCEs existing within the control resource set p

[0193] - : slot index

[0194] - : Number of PDCCH candidates for aggregation level L

[0195] - : PDCCH candidate index of aggregation level L

[0196] - i = 0, … , L-1

[0197] -

[0198] - : Terminal identifier

[0199] The value can be 0 for a common search space.

[0200] 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.

[0201] 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, CA technology can increase the total frequency bandwidth by combining individual component carriers with relatively small bandwidths, thereby enabling ultra-high-speed data services.

[0202] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. 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, 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. Although embodiments of the present disclosure are described below using a 5G system as an example, embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, this may include LTE or LTE-A mobile communication and mobile communication technologies developed after 5G. Therefore, embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure as determined by a person skilled in the art.

[0203] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0204] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0205] - MIB (Master Information Block)

[0206] - SIB (System Information Block) or SIB

[0207] - RRC (Radio Resource Control)

[0208] - MAC (Medium Access Control) CE (Control Element)

[0209] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the physical layer channel or signaling below.

[0210] - PDCCH (Physical Downlink Control Channel)

[0211] - DCI (Downlink Control Information)

[0212] - UE-specific DCI

[0213] - Group common DCI

[0214] - Common DCI

[0215] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0216] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0217] - PUCCH (Physical Uplink Control Channel)

[0218] - UCI (Uplink Control Information)

[0219] Hereinafter, in the description of one embodiment of the present disclosure, "below" may be replaced with "less than," and "above" may be replaced with "above." Conversely, "below" may be replaced with "below," and "above" may be replaced with "above."

[0220] In the present disclosure below, the above examples are described through a number of embodiments, but they are not independent and one or more embodiments may be applied simultaneously or in combination.

[0221] 5G systems are designed and developed for 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 energy source (e.g., devices using small rechargeable or single coin-cell batteries). Sensors and actuators are widely deployed in 5G use cases for monitoring, measurement, and charging. Typically, these devices require batteries that are non-rechargeable and can last for at least several years. Wearables, including smartwatches, rings, eHealth devices, and medical monitoring devices, typically struggle to last more than one to two weeks, depending on usage.

[0222] The power consumption of 5G terminals depends on the configured length of wake-up periods (e.g., paging cycles), and large extended discontinuous reception (eDRX) cycles can be used to meet battery life requirements. However, eDRX methods are not suitable for low-latency services because they rely on high latency to maintain long battery life. 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 therefore, long eDRX cycles as before are not suitable because they cannot meet the latency requirements.

[0223] [Example 1: LP-WUS / WUR Description]

[0224] As mentioned above, existing terminals are not suitable for simultaneously satisfying both high energy efficiency and low latency requirements. Therefore, the introduction of a low-power wake-up receiver (LP-WUR), a separate receiver that reduces power consumption and latency when there is no traffic, is being discussed. Below, a terminal that includes a wake-up receiver is described in detail.

[0225] 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. Specifically, FIG. 5 illustrates state transitions between a base station and a terminal to address the aforementioned issues. Various modifications may be made to the method illustrated in FIG. 5 . For example, although illustrated as a series of steps, the various steps in each diagram may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0226] In one embodiment, a 5G terminal may require a periodic wake-up once per DRX cycle, which may dominate power consumption during periods of no signaling or data traffic. Power consumption could be drastically reduced if the terminal could wake up only when triggered, such as for paging. This drastic power reduction can be achieved by triggering the main radio (or main receiver, e.g., a legacy NR radio) using a low-power wake-up signal (LP-WUS), as shown in FIG. 5, and using a separate receiver, a wake-up receiver, that can monitor the wake-up signal at ultra-low power to turn on the main radio only when data transmission or reception is required.

[0227] In one embodiment, at step 501, the base station may transmit a wake-up signal to the terminal.

[0228] At step 502, the terminal can receive a wake-up signal using a wake-up receiver.

[0229] In step 503, the terminal can trigger the main radio, which is in the OFF state, based on the received signal. For example, triggering the main radio may mean triggering a state transition for the main radio. For example, this may be a trigger for switching the main radio from the OFF state to the ON state, or a trigger for switching the main radio from the ON state to the OFF state.

[0230] In step 504, the terminal may set the main radio to an awake state. If the base station has no data traffic to transmit to the terminal and the conditions for the terminal to monitor a wake-up signal are met, the terminal may keep the main radio in 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 completely off state. A terminal in a UDS state may consume less power than a terminal in a DS state. Whether the main radio is completely off, in a DS state, or in a UDS state may be determined by which components within the main radio can be turned off or how the main radio operates.

[0231] At step 505, if data traffic to be transmitted from the base station to the terminal is generated and the wake-up signal transmitted by the base station at step 501 is detected, at 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.

[0232] In one embodiment, the power consumption for monitoring 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 gains can be maximized for power-sensitive and small form factor devices including Internet of Things (IoT) use cases (such as industrial sensors and controllers) and wearables.

[0233] In one embodiment, a terminal including a wake-up receiver may report to a base station that it has the capability to wake up the main radio using the wake-up receiver or may report capability information to the base station that the terminal includes a wake-up receiver.

[0234] According to one embodiment, 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.

[0235] In one embodiment, when a base station supports a terminal including a wake-up receiver (e.g., when the base station has hardware capable of transmitting a wake-up signal), the base station may determine whether to use the wake-up receiver after receiving capability information about the wake-up receiver from the terminal. In one embodiment, the base station may transmit a signal to the terminal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal. In one embodiment, the base station may transmit to the terminal at least one of instruction information for activating the terminal's reception of the wake-up signal or the wake-up receiver or instruction information for notifying the base station of transmission of the wake-up signal. From the slot in which the signal is received, after a slot configured by the base station (or defined in the standard (predefined)), the terminal may turn off the main radio and turn on the wake-up receiver for monitoring the wake-up signal. In one embodiment, if the serving cell measurement value remains above a specified threshold for a predetermined period of time, the terminal may turn off the main radio and turn on the wake-up receiver for monitoring the wake-up signal. In one embodiment, if the serving cell measurement value remains below 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.

[0236] In one embodiment, when a base station does not support a terminal having a wake-up receiver, the base station may receive capability information about the wake-up receiver from the terminal and then transmit a signal to the terminal indicating that the wake-up receiver is unusable. The terminal may transmit feedback to the base station indicating that it has received a signal indicating that the wake-up receiver is unusable. In one embodiment, the terminal may perform an operation according to parameters of the existing power saving method set by the base station using an existing power saving method (C-DRX (connected mode DRX) or I-DRX (idle mode DRX) such as paging).

[0237] According to various embodiments of the present disclosure, after a capability report of a terminal having a wake-up receiver and a procedure for determining whether the wake-up receiver is supported (or permitted) by a base station, the wake-up receiver of the terminal may perform an operation for turning on the main radio of the terminal by receiving a wake-up signal. In one embodiment, the terminal may independently perform the operation for turning on the main radio, the operation for reporting the capability of the terminal having the wake-up receiver, or the operation for determining whether the wake-up receiver is supported by the base station. For example, even if the capability report operation and the permission procedure of the terminal are not performed, the base station may transmit a signal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal to the terminal. Accordingly, among the terminals receiving a signal from the base station, a terminal having a wake-up receiver may perform an operation for turning on the main radio through the wake-up receiver.

[0238] According to one embodiment, 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 applied to all terminals within the cell supported by the base station (e.g., RRC_CONNECTED terminals, RRC_IDLE / RRC_INACTIVE terminals, or terminals accessing the cell (e.g., RRC_CONNECTED terminals)). If the capability report operation of the terminal and the base station authorization procedure are not performed, the operation of turning on / off the main radio through the wake-up receiver may be applied to RRC_IDLE / RRC_INACTIVE terminals camping within the cell supported by the base station. In addition, various embodiments of the present disclosure may include at least one of all, part, or a combination of parts of various operations of a terminal and a base station including a wake-up receiver as disclosed below.

[0239] 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.

[0240] According to one embodiment, when the main radio of the terminal is on, the terminal can receive a downlink signal (or data) from the base station via the main radio. According to various embodiments of the present disclosure, the main radio being 'on' may be expressed as the main radio being 'turned on' or the main radio being 'activated', and may have a similar or substantially equivalent meaning thereto. According to one embodiment, the main radio being activated may mean that specific components of the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned on or activated, or may be defined by a standard (e.g., 3GPP technical specification (TS) document). However, according to various embodiments of the present disclosure, without being limited to the above, the main radio being activated may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto. Alternatively, 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).

[0241] In one embodiment, when the main radio of the terminal is off, the terminal may be considered to be in a sleep period and / or may be considered not to receive a downlink signal (or data) from the base station. In various embodiments of the present disclosure, the main radio being 'off' may be expressed as the main radio being 'turned off' or the main radio being 'deactivated', and may have a similar or substantially equivalent meaning thereto. In one embodiment, the main radio being deactivated may mean that specific components of the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned off or deactivated, or may be defined by a standard (e.g., 3GPP TS document). However, in various embodiments of the present disclosure, without being limited to the above, the main radio being deactivated may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto. Alternatively, the main radio being disabled may 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).

[0242] According to one embodiment, 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. A terminal having a wake-up receiver capable of receiving the signal can obtain time / frequency synchronization required for receiving the wake-up signal not only through the main radio but also through the wake-up receiver. The wake-up receiver can receive at least one of the LP-SS and the PSS / SSS, or neither, depending on the terminal capability.

[0243] [Example 2: Neighboring cell relaxation measurement]

[0244] As previously explained, in order to save power consumption, the main radio is triggered to turn on through the wake-up receiver only when the terminal receives a wake-up signal from the base station, so that the main radio can receive a downlink signal from the base station, and the main radio can be turned off when the wake-up signal is not received. In this case, the terminal in the RRC IDLE or RRC INACTIVE state may still need to perform not only serving cell (or camping cell)-related measurements, but also neighboring cell-related measurements and cell selection / reselection evaluations. In this case, if the main radio is triggered for each DRX cycle to perform neighboring cell measurements and evaluations due to the neighboring cell measurement initiation conditions being met in addition to the serving cell, a significant amount of the power 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. so that the downlink control channel can be normally searched in the on state. In the present disclosure, a method for solving this problem will be described.

[0245] In describing the following embodiments, the peripheral cell measurement may be understood as a measurement that includes measurement of at least one of an intra-frequency cell, an inter-frequency cell, or an inter-RAT (Radio Access Technology) cell, depending on a triggering condition. In this case, an intra-frequency cell is a cell among adjacent cells whose center frequency is the same as that of the serving cell, an inter-frequency cell is a cell whose center frequency is different from that of the serving cell, and an inter-RAT cell may mean a cell of a different communication technology generation, such as between E-UTRAN (Evolved Universal Terrestrial Radio Access Network) and NR.

[0246] In describing the following embodiments, 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).

[0247] In one embodiment, the wake-up receiver of the terminal (or the terminal equipped with the wake-up receiver) can perform RRM measurement / evaluation instead of the conventional RRM measurement / evaluation that the main radio of the terminal should perform when the wake-up receiver is configured or activated and turned on to detect a wake-up signal and the main radio is off. For convenience, in the description of one embodiment of the present disclosure, the RRM measurement / evaluation performed by the wake-up receiver of the terminal in this way will be referred to as LR (LP-WUR, Lower Power Wake-Up Receiver) RRM measurement / evaluation. In addition, the RRM measurement / evaluation performed by the conventional main radio will be referred to as MR (main radio, main receiver) RRM measurement / evaluation.

[0248] In one embodiment, if the main radio is off for every DRX cycle in which MR RRM measurement / evaluation is to be performed, LR RRM measurement / evaluation may be performed instead. Alternatively, a cycle for LR RRM measurement / evaluation may be separately defined (predefined) in the specification. When the wake-up receiver of the terminal performs LR RRM measurement, the signal to be measured may be at least one of the PSS / SSS, LP-SS, and wake-up signal included in the existing SS / PBCH block.

[0249] 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 at regular intervals for serving cell (or camped cell) related measurements. In this case, the state transition energy consumed when the main radio transitions from UDS to active state according to the existing operation may exceed the power consumption savings. For example, one experimental result showed that when the main radio wakes up for serving cell measurements at 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. As another example, another experimental result showed that when the main radio wakes up at every K DRX cycles, and when K is greater than 1, a power consumption savings can be obtained. In the above case, when K increases beyond a certain value (e.g., 8 or more), a power consumption reduction gain of approximately 40% was observed. Based on the experimental results, it is clear that serving cell measurement relaxation is essential for a terminal equipped with a wake-up receiver to obtain power consumption reduction benefits.

[0250] Below, we describe the power consumption of a UE when neighbor cell measurement / detection is triggered. If the neighbor cell measurement / detection condition is triggered because the RSRP (reference signal received power) or RSRQ (reference signal received quality) of the serving cell is less than or equal to a certain threshold, the UE is required to measure / detect neighbor cells using the main radio for every given DRX cycle. Therefore, while the main radio is off, the wake-up receiver is on, and the wake-up signal is being detected, the main radio must still be activated for every given DRX cycle for neighbor cell-related measurements. Just as the main radio is activated for serving cell measurements, the state transition energy consumed when the main radio transitions from UDS to active state can exceed the power consumption savings. Similar to serving cell measurement relaxation, neighbor cell measurement relaxation will obviously increase the power consumption savings. However, for example, according to an experimental result, it was observed that there was almost no power consumption saving benefit when the serving cell measurement relaxation was not set and the neighboring cell measurement relaxation was set while the terminal was equipped with a wake-up receiver and the neighboring cell measurement / detection condition was triggered because the neighboring cell measurement / detection condition was triggered, the main radio was off, the wake-up receiver was on, and the wake-up signal was detected. According to the experimental result, it can be inferred that both the serving cell measurement relaxation and the neighboring cell measurement relaxation would be needed at the same time to obtain the power consumption saving benefit for the terminal equipped with the wake-up receiver and the neighboring cell measurement / detection condition triggered because the RSRP or RSRQ of the serving cell is less than or equal to a certain threshold.

[0251] When a terminal equipped with a wake-up receiver performs RRM measurement / detection, RRM measurement / detection can be performed with the main radio or the wake-up receiver. Conventional terminals compare SS-RSRQ or SS-RSRP measured in RRC_IDLE / INACTIVE with a configured threshold to determine neighboring cell measurement triggering. If a terminal equipped with a wake-up receiver uses the conventional method, the following difficulties may occur. First, if the terminal performs only LR RRM measurement / detection, the measurement values ​​of the main radio cannot be obtained. Second, if the terminal uses both MR RRM measurement / detection and LR RRM measurement / detection and serving cell measurement relaxation is configured, the measurement values ​​of the main radio can be obtained at a long interval, which delays neighboring cell measurement triggering. Since the above problems cannot be solved by existing neighboring cell measurement triggering methods, a new neighboring cell measurement triggering method is required for terminals equipped with a wake-up receiver.

[0252] In one embodiment, the terminal may have its main radio turned on and may receive relevant 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. In this case, the wake-up receiver of the terminal may support LR RRM measurement / evaluation. That is, the terminal may support LR RRM measurement / evaluation through the wake-up receiver. If the wake-up receiver has the terminal capability to perform LR RRM measurement / evaluation (if the terminal has the terminal capability to perform LR RRM measurement / evaluation through the wake-up receiver), the wake-up receiver may detect the wake-up signal and measure or evaluate at least one of the PSS / SSS, or the LP-SS included in the SS / PBCH block. In addition, the terminal may report to the network the terminal capability report including at least one of the LR RRM measurement / evaluation capability and the PSS / SSS or LP-SS measurement / evaluation capability of the wake-up receiver. That is, the terminal may report to the network the terminal capability report including at least one of the LR RRM measurement / evaluation capability and / or the PSS / SSS or LP-SS measurement / evaluation capability through the wake-up receiver. In this case, the terminal may determine whether the cell selection criterion S is satisfied based on the RSRP or RSRQ measurement value. If the cell selection criterion S is not satisfied, the terminal may start measuring the neighboring cells with the main radio. Alternatively, if the network sets a frequency with a higher priority than the current NR frequency priority (inter-frequency layers of higher priority), the terminal may start measuring the neighboring cells with the main radio. After the terminal starts measuring the neighboring cells with the main radio, the wake-up receiver may be triggered to detect a wake-up signal depending on specific conditions.At this time, the terminal can perform serving cell measurement / detection with measurement relaxation applied to the main radio for RRM measurement detection, perform neighboring cell measurement / detection with measurement relaxation applied to the main radio, and / or perform serving cell measurement / detection with a wake-up receiver. Alternatively, the terminal can perform neighboring cell measurement / detection with measurement relaxation applied to the main radio without performing serving cell measurement / detection with the main radio, and perform serving cell measurement / detection with a wake-up receiver.

[0253] FIG. 6 illustrates an example of a method for triggering neighboring cell measurement / detection when a wake-up receiver monitors a wake-up signal, according to one embodiment of the present disclosure. Various modifications may be made to the method illustrated in FIG. 6 . For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0254] Referring to FIG. 6, in step 601, the terminal may detect a wake-up signal by activating and turning on the wake-up receiver, and the main radio may be turned off. In step 601, the wake-up receiver of the terminal may be turned on, the main radio may be turned off, and the terminal may detect a wake-up signal (e.g., LP-WUS) through the wake-up receiver.

[0255] The terminal can determine the triggering of neighboring cell measurements based on the neighboring cell measurement judgment criteria in step 602. In step 602, the terminal can check the neighboring cell triggering criteria. If the terminal determines the triggering of neighboring cell measurements in step 602 (e.g., if the neighboring cell triggering criteria are satisfied), the terminal can initiate neighboring cell measurements with the main radio in step 603. The neighboring cell measurement judgment criteria (neighboring cell triggering criteria) in step 602 will be described in more detail below.

[0256] In one embodiment, in step 602, the terminal may activate and turn on the wake-up receiver to detect the wake-up signal, and the main radio may be turned off. In step 602, the wake-up receiver of the terminal may be activated, and the main radio may be deactivated. At this time, the terminal may measure / detect the serving cell using the wake-up receiver without performing MR RRM measurement / detection. The method or criterion for the terminal to trigger neighboring cell measurement / detection may include at least one of the following.

[0257] - The terminal can compare the measured RSRP or RSRQ of the wake-up receiver with a specific threshold Th1. If the measured value of the wake-up receiver is less than or equal to the specific threshold Th1 for a specific time period T1, the performance of neighboring cell measurements can be triggered. The specific threshold and time period can be predefined in the standard or can be set by the network.

[0258] - The terminal can initiate MR RRM measurement / detection for a certain period of time based on the measured RSRP or RSRQ of the wake-up receiver to determine whether the cell selection criterion S is satisfied. At this time, MR RRM measurement / detection means serving cell measurement / detection, and measurement relaxation may or may not be set. For example, if the measurement value of the wake-up receiver is less than or equal to a specific threshold Th2 for a specific time T2, MR RRM measurement / detection can be started. The specific threshold and specific time can be preset in the standard or set by the network. If the cell selection criterion S is satisfied based on the measurement value of the main radio, the terminal can stop performing MR RRM measurement / detection and only perform LR RRM measurement / detection. If the cell selection criterion S is not satisfied, the performance of neighboring cell measurements can be triggered.

[0259] - When a frequency with a higher priority than the current NR frequency priority is set from the network (inter-frequency layers of higher priority), the terminal can trigger the performance of neighboring cell measurements.

[0260] Even if the terminal triggers neighbor cell measurement / detection, LR RRM measurement / detection can continue. Furthermore, neighbor cell measurement / detection of the main radio can be performed by applying measurement relaxation. Performing serving cell measurements of the main radio (or actions related to serving cell measurements of the main radio) can include at least one of the following actions:

[0261] - The main radio performs serving cell measurement / detection by applying serving cell measurement relaxation.

[0262] - The main radio does not perform serving cell measurements (e.g., it may stop performing serving cell measurements via the main radio).

[0263] - If the neighboring cell measurement is triggered to search for higher priority frequencies (inter-frequency layers of higher priority) while satisfying the cell selection criterion S, the terminal does not perform serving cell measurement of the main radio (for example, serving cell measurement through the main radio may be stopped). In other cases, the main radio performs serving cell measurement / detection by applying serving cell measurement relaxation.

[0264] According to one embodiment, in step 602, the terminal may activate and turn on the wake-up receiver to detect a wake-up signal, and the main radio may be turned off. In step 602, the wake-up receiver of the terminal may be activated, and the main radio may be deactivated. At this time, the terminal may apply serving cell measurement relaxation to the main radio and perform serving cell measurement / detection. Then, the serving cell may be measured / detected using the wake-up receiver. The method or criterion for the terminal to trigger neighbor cell measurement / detection may include at least one of the following.

[0265] - The terminal can compare the measured RSRP or RSRQ of the wake-up receiver with a specific threshold Th1. If the measured value of the wake-up receiver is less than or equal to the specific threshold Th1 for a specific time period T1, the performance of neighboring cell measurements can be triggered. The specific threshold and time period can be predefined in the standard or can be set by the network.

[0266] - It is possible to determine whether the cell selection criterion S is satisfied based on the measurement value of the main radio of the terminal. If the cell selection criterion S is not satisfied, the performance of measurements of surrounding cells can be triggered.

[0267] - The combination of the measurements of the main radio of the terminal and the measurements of the wake-up receiver can be compared with a specific threshold Th3. The combination of the measurements of the main radio and the measurements of the wake-up receiver (e.g., A*RSRP) MR + B*RSRP LR , at this time RSRP MR is the measurement value of the main radio, RSRP LR If the measurement value of the wake-up receiver, A+B=1 (where each RSRP can be replaced by RSRQ or other measurement value), is less than or equal to a specific threshold Th3 for a specific time T3, it can trigger the performance of neighboring cell measurements. Here, A and B can be predetermined in the specification, configured by the network, or configured by the terminal implementation. The predetermined threshold and the specific time can be predetermined in the specification or configured by the network.

[0268] - When a frequency with a higher priority than the current NR frequency priority is set from the network (inter-frequency layers of higher priority), the terminal can trigger the performance of neighboring cell measurements.

[0269] Even if the terminal triggers neighbor cell measurement / detection, LR RRM measurement / detection can continue. Furthermore, neighbor cell measurement / detection of the main radio can be performed by applying measurement relaxation. Performing serving cell measurements of the main radio (or actions related to serving cell measurements of the main radio) can include at least one of the following actions:

[0270] - The main radio performs serving cell measurement / detection by applying serving cell measurement relaxation.

[0271] - The main radio does not perform serving cell measurements (e.g., it may stop performing serving cell measurements via the main radio).

[0272] - If the neighboring cell measurement is triggered to search for higher priority frequencies (inter-frequency layers of higher priority) while satisfying the cell selection criterion S, the terminal does not perform serving cell measurement of the main radio (for example, serving cell measurement through the main radio may be stopped). In other cases, the main radio performs serving cell measurement / detection by applying serving cell measurement relaxation.

[0273] FIG. 7 illustrates an example of a method for a wake-up receiver to stop neighboring cell measurement / detection when monitoring a wake-up signal according to one embodiment of the present disclosure. Various modifications may be made to the method illustrated in FIG. 7 . For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0274] Referring to FIG. 7, in step 701, the terminal detects a wake-up signal by activating and turning on the wake-up receiver, and although the main radio is turned off, neighboring cell measurement / detection can be performed. In step 701, the wake-up receiver of the terminal may be turned on, the main radio may be turned off, and the terminal may detect a wake-up signal (e.g., LP-WUS) through the wake-up receiver. In addition, neighboring cell measurement / detection can be performed by the main radio that is turned off as described above.

[0275] In step 702, the terminal can decide to stop neighboring cell measurement based on the neighboring cell measurement judgment criteria. In step 702, the terminal can check the neighboring cell triggering criteria. If the terminal decides to stop neighboring cell measurement in step 702 (e.g., if the neighboring cell triggering criteria are met), the terminal can stop neighboring cell measurement with the main radio in step 703. The neighboring cell measurement judgment criteria (neighboring cell triggering criteria) in step 702 will be described in more detail below.

[0276] In one embodiment, in step 702, the terminal may activate and turn on the wake-up receiver to detect the wake-up signal, and the main radio may be turned off. In step 702, the wake-up receiver of the terminal may be activated, and the main radio may be deactivated. At this time, the terminal may measure / detect the serving cell with the wake-up receiver, without performing serving cell measurement / detection with the main radio. In addition, the terminal may perform relaxed neighboring cell measurement / detection with the main radio. A method or criterion for the terminal to stop neighboring cell measurement / detection may include at least one of the following.

[0277] - The terminal can compare the measured RSRP or RSRQ of the wake-up receiver with a specific threshold Th1. If the measured value of the wake-up receiver is greater than the specific threshold Th1 for a specific time period T1, the terminal can stop performing measurements of neighboring cells. The specific threshold and time period can be predefined in the standard or can be set by the network.

[0278] - The terminal can initiate MR RRM measurement / detection for a certain period of time based on the measured RSRP or RSRQ of the wake-up receiver to determine whether the cell selection criterion S is satisfied. At this time, MR RRM measurement / detection means serving cell measurement / detection, and measurement relaxation may or may not be set. For example, if the measurement value of the wake-up receiver is greater than a specific threshold Th2 for a specific time T2, MR RRM measurement / detection can be started. The specific threshold and specific time may be predetermined in the standard or may be set from the network. If the cell selection criterion S is not satisfied based on the measurement value of the main radio, the serving cell measurement / detection of the main radio is stopped, and the neighboring cell measurement is continued. If the cell selection criterion S is satisfied, the terminal can stop performing the neighboring cell measurement.

[0279] - After reselecting a frequency with a higher priority (inter-frequency layers of higher priority) than the current NR frequency priority set by the network, or when the above setting is no longer valid, the terminal may stop performing neighboring cell measurements.

[0280] Even if the terminal stops measuring / detecting neighboring cells, LR RRM measurements / detection can continue. Furthermore, the main radio may not perform serving cell measurements.

[0281] According to one embodiment, in step 702, the terminal may activate and turn on the wake-up receiver to detect a wake-up signal, and the main radio may be turned off. In step 702, the wake-up receiver of the terminal may be activated, and the main radio may be deactivated. At this time, the terminal may apply serving cell measurement relaxation to the main radio and perform serving cell measurement / detection, and may measure / detect the serving cell with the wake-up receiver. In addition, the terminal may perform measurement / detection of neighboring cells with the measurement relaxation using the main radio. A method or criterion for the terminal to stop neighboring cell measurement / detection may include at least one of the following:

[0282] - The terminal can compare the measured RSRP or RSRQ of the wake-up receiver with a specific threshold Th1. If the measured value of the wake-up receiver is greater than the specific threshold Th1 for a specific time period T1, the terminal can stop performing measurements of neighboring cells. The specific threshold and time period can be predefined in the standard or can be set by the network.

[0283] - It is possible to determine whether the cell selection criterion S is satisfied based on the measurement value of the main radio of the terminal. If the cell selection criterion S is satisfied, the measurement of surrounding cells can be stopped.

[0284] - The combination of the measurements of the main radio of the terminal and the measurements of the wake-up receiver can be compared with a specific threshold Th3. The combination of the measurements of the main radio and the measurements of the wake-up receiver (e.g., A*RSRP) MR + B*RSRP LR , at this time RSRP MR is the measurement value of the main radio, RSRP LRIf the measurement value of the wake-up receiver, A+B=1 (where each RSRP can be replaced by RSRQ or other measurement value), is greater than a certain threshold Th3 for a certain time T3, the neighboring cell measurement can be stopped. At this time, A and B can be predetermined in the specification, configured from the network, or configured by the terminal implementation. The predetermined threshold and the certain time can be predetermined in the specification or configured from the network.

[0285] - After reselecting a frequency with a higher priority (inter-frequency layers of higher priority) than the current NR frequency priority set by the network, or when the above setting is no longer valid, the terminal may stop performing neighboring cell measurements.

[0286] Even if the terminal stops measuring / detecting neighboring cells, LR RRM measurements / detection can continue. Furthermore, the main radio can apply serving cell measurement relaxation and perform serving cell measurements / detection.

[0287] In one embodiment, the terminal may activate and turn on the wake-up receiver to detect a wake-up signal, and the main radio may be turned off. At this time, the terminal may measure / detect the serving cell with the wake-up receiver, and the terminal may perform measurement / detection of the relaxed neighboring cells with the main radio. At this time, it can be expected that as the neighboring cell measurement relaxation factor J increases, the measurement accuracy decreases and the power consumption reduction increases. Therefore, the neighboring cell measurement relaxation factor J should be determined by considering the measurement accuracy of the neighboring cells and the power consumption reduction. The terminal may determine the neighboring cell measurement relaxation factor J in step 602 and / or step 702. The method for the terminal to determine the neighboring cell measurement relaxation factor J may include at least one of the following methods.

[0288] - The surrounding cell measurement relaxation factor J may be equal to the cell measurement relaxation factor K. If the K value is not set or does not exist, the terminal may obtain the J and K values ​​from at least one of the network settings, terminal implementation, or values ​​fixed in the specification.

[0289] - The surrounding cell measurement relaxation factor J can be determined according to the serving cell measurement relaxation factor K. A specific value J2 is given by the network configuration or terminal implementation, and the surrounding cell measurement relaxation factor J can take the maximum or minimum value of the cell measurement relaxation factor K and the specific value J2. The specific value J2 can be obtained from at least one of the network configuration, terminal implementation, or a value fixed in the specification. If the value K is not set or does not exist, the terminal can use the value J2 for the J value.

[0290] - The surrounding cell measurement relaxation factor J may be determined based on the measurement values ​​of the wake-up receiver. A method for determining the surrounding cell measurement relaxation factor J may include at least one of the following methods.

[0291] ○ The RSRP or RSRQ change of the wake-up receiver can be compared with a specific threshold Th4 during a specific time T4. For example, (RSRP ref - RSRP) is TH RSRP If it is less than, the surrounding cell measurement relaxation factor J can be set to a value greater than or equal to a specific value X. If it is not satisfied, a value less than X can be set. At this time, the specific value X can be set by the network or a fixed value in the standard can be used. At this time, RSRP ref is the reference RSRP, RSRP is the RSRP of the current wake-up receiver, and TH RSRP can be seen as a threshold. The above TH RSRP can be predefined in the specification or can be configured from the network. For example, RSRP refWhen the first wake-up receiver is activated and measures the serving cell, the current RSRP is RSRP ref If included in at least one of the larger cases, RSRP ref The current wakeup receiver can use the RSRP value measured by the device.

[0292] ○ The terminal can compare the measured RSRP or RSRQ of the wake-up receiver with a specific threshold Th5. If the measured value of the wake-up receiver is greater than the specific threshold Th5 for a specific time T5, the neighboring cell measurement relaxation factor J can be set to a value greater than or equal to a specific value X. If not satisfied, a value less than X can be set. At this time, the specific value X can be set by the network or a fixed value in the standard can be used. The specific threshold and the specific time can be preset in the standard or can be set by the network.

[0293] A UE in RRC IDLE or RRC INACTIVE state may still need to perform measurements related to the serving cell (or the cell it is camping on) as well as measurements related to neighboring cells and cell selection / reselection evaluation. In this case, if the conditions for initiating measurements of neighboring cells in addition to the serving cell are met and the main radio is triggered for each DRX cycle to perform neighboring cell measurements and evaluations, the transition energy of the main radio from off to on and the power required for the process of performing synchronization, AGC (adaptive gain control), etc. to normally detect the downlink control channel in the on state may be large. If this state is fully utilized when the main radio is turned on for RRM measurement / detection, the number of transition states of the main radio can be reduced, and thus an increased power consumption reduction benefit can be expected. For example, if the main radio can continuously perform neighboring cell (intra-frequency cell detection and inter-frequency cell detection) when turned on for serving cell detection, a higher power consumption reduction benefit can be obtained. This will be explained in more detail below.

[0294] FIG. 8 illustrates an example of a method for a terminal to perform RRM measurement / detection in a wireless communication system according to one embodiment of the present disclosure. In FIG. 8, according to one embodiment, the terminal may activate and turn on a wake-up receiver to detect a wake-up signal, and the main radio may be turned off.

[0295] Referring to FIG. 8, the terminal may perform measurement / detection of a serving cell (801), an intra-frequency cell (802), and / or an inter-frequency cell (803). The terminal may be requested to perform RRM measurement / detection within a measurement alignment window. The measurement alignment window is a window in which the main radio must periodically perform RRM measurement / detection at least within the window, and may be set when the wake-up receiver is activated and turned on to detect a wake-up signal.

[0296] In the Measurement Alignment Window, the main radio may be requested to perform measurement / detection of a serving cell (801), an intra-frequency cell (802), and an inter-frequency cell (803), and the terminal may transition to a light sleep or medium sleep state without transitioning to the UDS state to minimize the transition power consumption of the main radio. The terminal performs the required serving cell, intra-frequency cell, and inter-frequency cell measurement / detection according to the RRM measurement / detection configuration of the main radio. For example, if measurement / detection of an intra-frequency cell and an inter-frequency cell is not triggered, no measurement is requested in the Measurement Alignment Window. Although the terminal is requested to perform RRM measurement / detection in the Measurement Alignment Window, the terminal is not limited thereto. For example, the implementation of the terminal may not restrict RRM measurement / detection outside the Measurement Alignment Window. The Measurement Alignment Window may include at least information about the period (804) and size (805) of the window. The measurement alignment window can be set according to information about the setting cycle (804) of the measurement alignment window and information about the size (805) of the measurement alignment window.

[0297] In one embodiment, the period (804) of the measurement alignment window may refer to the time interval at which the window repeats or the DRX cycle. The period (804) may include at least one of values ​​set by the network, implemented by the terminal, and defined by the standard. Alternatively, the period (804) may include one of the minimum or maximum values ​​of the measurement periods of the serving cell (801), the intra-frequency cell (802), and the inter-frequency cell (803).

[0298] In one embodiment, the size (805) may denote the start and end times of the window. The unit of the window size may include at least one of an absolute time, an SMTC cycle, or a DRX cycle. The size of the window may be determined by at least one of the following methods.

[0299] - The size of the measurement alignment window can be set to N*1.28s. In this case, N can include at least one of the values ​​set by the network, terminal implementation, and standard.

[0300] - The size of the measurement alignment window can be determined by N consecutive DRX cycles. N can include at least one of the network-configured, terminal-implemented, and standardized values. Alternatively, N can be N consecutive cycles for evaluating the serving cell determination criterion S of the main radio. serv It could be the DRX cycle.

[0301] - The size of the measurement alignment window can be determined by N consecutive SMTC cycles. N can include at least one of the network-defined, terminal-implemented, and standard-defined values.

[0302] In the above window size determination method, the terminal can determine the N value by considering the time for tuning the RF chain for frequency change for inter-frequency cell measurement / detection.

[0303] FIG. 9 is a block diagram illustrating the functional structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0304] 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).

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] The terminal processing unit (905) can control a series of processes so that the terminal can operate according to the aforementioned embodiments of the present disclosure. The terminal processing unit (905) can be implemented as a control unit or one or more processors.

[0310] FIG. 10 is a block diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0311] 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).

[0312] 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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 damage the essence thereof.

[0320] 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.

[0321] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical content of the present disclosure and facilitate 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, each of the above embodiments can be combined and operated as needed.

[0322] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0323] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

[0324] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0325] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0326] In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0327] While the detailed description of the present disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of the present disclosure. For example, some or all of the embodiments may be combined with some or all of one or more other embodiments, and such combinations also naturally fall within the scope of the embodiments proposed in the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the claims described below, but also by equivalents thereof.

[0328] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. In a method performed by a terminal in a communication system, A step of receiving, through upper layer signaling, a first setting related to a low-power wake-up signal and a second setting related to a measurement alignment window; A step of performing measurement on the low-power wake-up signal through the low-power wake-up receiver of the terminal based on the first setting; A step of identifying whether to trigger RRM (radio resource management) measurement based on MR (main radio) of the terminal based on measurement of the low power-wake-up signal; and A method comprising the step of performing RRM measurement based on MR of the terminal within the measurement alignment window based on the second setting when triggering of RRM measurement based on MR of the terminal is identified.

2. In the first paragraph, the step of identifying whether RRM measurement based on MR of the terminal is triggered is: A step of identifying that the RRM measurement based on the MR of the terminal is triggered when the received signal received power (RSRP) or received signal received quality (RSRQ) corresponding to the low power-wake-up signal is less than or equal to a first threshold for a first time interval; or A method comprising: a step of identifying that RRM measurement based on MR of the terminal is triggered when the sum of a value to which a first scaling factor is applied for RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied for RSRP or RSRQ corresponding to a reference signal received through MR of the terminal is less than or equal to a second threshold during a second time interval; wherein the sum of the first scaling factor and the second scaling factor is 1.

3. In the first paragraph, the step of identifying whether RRM measurement based on MR of the terminal is stopped is further included, and the step of identifying whether RRM measurement based on MR of the terminal is stopped is: A step of identifying that the RRM measurement based on the MR of the terminal is to be stopped if the RSRP or RSRQ corresponding to the low power-wake-up signal exceeds a first threshold during a first time interval; or A method comprising: a step of identifying that RRM measurement based on MR of the terminal is to be stopped when the sum of a value to which a first scaling factor is applied for RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied for RSRP or RSRQ corresponding to a reference signal received through MR of the terminal is less than or equal to a second threshold during a second time interval; wherein the sum of the first scaling factor and the second scaling factor is 1.

4. In paragraph 1, The RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, The above measurement alignment window is a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and the relaxed serving cell measurement based on the MR of the terminal, A method wherein the second setting includes information about the size of the measurement alignment window and information about the period of the measurement alignment window, wherein the size of the measurement alignment window is set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

5. In paragraph 4, The above relaxed peripheral cell measurement is based on a peripheral cell measurement relaxation factor, and the peripheral cell measurement relaxation factor is: Determined to be equal to the serving cell measurement relaxation factor; Determined to be equal to the maximum or minimum value among specific values ​​for the serving cell measurement relaxation factor and the surrounding cell measurement relaxation factor; Determined based on the result of comparing the change in RSRP or RSRQ corresponding to the low power wake-up signal with the third threshold during the third time interval; or A method based on one or more of the following: determining the RSRP or RSRQ corresponding to the low power wake-up signal based on a result of comparing the RSRP or RSRQ with a fourth threshold during a fourth time interval; 6. At the terminal of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Receive, via upper layer signaling, a first configuration related to a low-power wake-up signal and a second configuration related to a measurement alignment window; Performing measurement on the low-power wake-up signal through the low-power wake-up receiver of the terminal based on the first setting; Identifying whether RRM (radio resource management) measurement based on the main radio (MR) of the terminal is triggered based on the measurement of the low power-wake-up signal; and A terminal configured to perform RRM measurement based on MR of the terminal within the measurement alignment window based on the second setting when triggering of RRM measurement based on MR of the terminal is identified.

7. In the 6th paragraph, in identifying whether RRM measurement based on MR of the terminal is triggered, the processor: If the received signal received power (RSRP) or received signal received quality (RSRQ) corresponding to the low power-wake-up signal is less than or equal to a first threshold for a first time interval, the RRM measurement based on the MR of the terminal is identified as being triggered; or A terminal, wherein the RRM measurement based on the MR of the terminal is identified as being triggered when the sum of a value to which a first scaling factor is applied for the RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied for the RSRP or RSRQ corresponding to the reference signal received through the MR of the terminal is less than or equal to a second threshold during a second time interval; and the sum of the first scaling factor and the second scaling factor is 1.

8. In the 6th paragraph, the processor is set to identify whether RRM measurement based on MR of the terminal is stopped, In identifying whether RRM measurement based on MR of the terminal is stopped, the processor: Identifies that the RRM measurement based on the MR of the terminal is to be stopped if the RSRP or RSRQ corresponding to the low power-wake-up signal exceeds the first threshold for the first time interval; or A terminal, wherein the terminal identifies that RRM measurement based on MR is to be stopped when the sum of a value to which a first scaling factor is applied for RSRP or RSRQ corresponding to the low power-wake-up signal and a value to which a second scaling factor is applied for RSRP or RSRQ corresponding to a reference signal received through MR of the terminal is less than or equal to a second threshold during a second time interval; and the sum of the first scaling factor and the second scaling factor is 1.

9. In paragraph 6, The RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, The above measurement alignment window is a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and the relaxed serving cell measurement based on the MR of the terminal, The terminal, wherein the second setting includes information about the size of the measurement alignment window and information about the period of the measurement alignment window, and the size of the measurement alignment window is set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

10. In paragraph 9, The above relaxed peripheral cell measurement is based on a peripheral cell measurement relaxation factor, and the peripheral cell measurement relaxation factor is: Determined to be equal to the serving cell measurement relaxation factor; Determined to be equal to the maximum or minimum value among specific values ​​for the serving cell measurement relaxation factor and the surrounding cell measurement relaxation factor; Determined based on the result of comparing the change in RSRP or RSRQ corresponding to the low power wake-up signal with the third threshold during the third time interval; or A terminal based on one or more of the following: determining the RSRP or RSRQ corresponding to the low power wake-up signal based on a result of comparing the RSRP or RSRQ with the fourth threshold during the fourth time interval; 11. In a method performed by a base station in a communication system, A step of obtaining a first setting related to a low-power wake-up signal for a low-power wake-up receiver of a terminal; A step of obtaining a second setting related to a measurement alignment window for (radio resource management) measurement based on MR (main radio) of the terminal; A step of transmitting the first setting and the second setting to the terminal through upper layer signaling; and A method comprising the step of transmitting the low-power wake-up signal to the terminal.

12. In paragraph 11, The RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, A method according to claim 1, wherein the measurement alignment window is a time interval for at least one of intra-frequency cell measurement based on the MR of the terminal or inter-frequency cell measurement based on the MR of the terminal and relaxed serving cell measurement based on the MR of the terminal.

13. In paragraph 12, A method wherein the second setting includes information about the size of the measurement alignment window and information about the period of the measurement alignment window, wherein the size of the measurement alignment window is set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

14. In the base station of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Obtain a first setting related to a low-power wake-up signal for a low-power wake-up receiver of the terminal; Obtain a second setting related to a measurement alignment window for (radio resource management) measurement based on the MR (main radio) of the terminal; Transmitting the first setting and the second setting to the terminal through upper layer signaling; and A base station configured to transmit the low-power wake-up signal to the terminal.

15. In paragraph 14, The RRM measurement based on the MR of the terminal is a relaxed peripheral cell measurement including at least one of an intra-frequency cell measurement based on the MR of the terminal or an inter-frequency cell measurement based on the MR of the terminal, The above measurement alignment window is a time interval for at least one of the intra-frequency cell measurement based on the MR of the terminal or the inter-frequency cell measurement based on the MR of the terminal and the relaxed serving cell measurement based on the MR of the terminal, A base station, wherein the second setting includes information about the size of the measurement alignment window and information about the period of the measurement alignment window, and the size of the measurement alignment window is set to one of: (i) N*1.28s, (ii) N DRX (discontinuous reception) cycles, or (iii) N SMTC (synchronization signal block (SSB)-based measurement timing configuration) cycles.

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