Method and device for on / off operation of terminal having wake-up receiver in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method performed by a terminal in a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving a wake-up activation signal or a wake-up deactivation signal from a base station; and turning on or off a main radio on the basis of the wake-up activation signal or the wake-up deactivation signal.

Description

Method and device for on / off operation of a terminal having a wake-up receiver in a wireless communication system

[0001] The present disclosure relates to a wireless communication system. More specifically, it relates to a method and device for a terminal with a wake-up receiver to turn on or off the main radio in a wireless communication system. The present disclosure aims to address the problem of excessive terminal power consumption and achieve high energy efficiency in a wireless communication system. The present disclosure defines the necessary terminal operations for a terminal with a wake-up receiver when the wake-up receiver is activated or deactivated.

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

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

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

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

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

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

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

[0009] In a wireless communication system according to one embodiment, a method of a user equipment (UE) is provided. The method of the UE may include: receiving, from a base station, a wake-up signal (WUS) through a wake-up receiver (WUR), the WUS signal including information indicating activation (ON) or deactivation (OFF) of a main radio (MR); activating or deactivating the MR based on the WUS; and, if the MR is activated, receiving downlink data through the MR.

[0010] According to one embodiment, the step of deactivating the MR may include at least one of: resetting a Medium Access Control (MAC) layer of the MR; releasing an RRC (Radio Resource Control) configuration for standalone operation of the MR and maintaining an RRC configuration for MR operation via WUR; starting a timer based on deactivation of the MR and a timer based on activation of the WUR; flushing a HARQ (Hybrid Automatic Repeat request) soft buffer of serving cells; resetting, stopping, or restarting relevant timers of a UE in an RRC connected or RRC idle / inactive state; stopping monitoring or receiving a downlink signal; maintaining monitoring or transmitting an uplink signal; stopping monitoring a PDCCH (Physical Downlink Control CHannel) of the MR; stopping serving cell measurement by the MR and performing serving cell measurement by the WUR; or performing MAC reconfiguration of the MR or the WUR.

[0011] According to one embodiment, the step of activating the MR may include at least one of: resetting a MAC layer of the MR; maintaining an RRC configuration for standalone operation of the MR and releasing an RRC configuration for MR operation via WUR; starting a timer based on activation of the MR; flushing HARQ soft buffers of serving cells; resetting, stopping, or restarting relevant timers of a UE in an RRC connected or RRC idle / inactive state; resuming monitoring or reception of a downlink signal; maintaining monitoring or transmission of an uplink signal; resuming PDCCH monitoring of the MR; performing serving cell measurement by the MR and stopping serving cell measurement by the WUR; performing MAC reconfiguration of the MR; or stopping a timer for operation of the WUR.

[0012] According to one embodiment, the method of the UE may further include the steps of receiving, from the base station, information about a time interval during which the WUS can be monitored; information about a monitoring occasion during which the WUS can be detected; and information about a period during which the time interval is repeated.

[0013] According to one embodiment, the method of the UE may further include: upon receiving information indicating activation of the WUR from the base station, deactivating the MR; and monitoring the WUS through the WUR, at a monitoring occasion, for a time interval, at each period.

[0014] In one embodiment, a plurality of monitoring occasions included within a time interval in which a WUS can be monitored may each be associated with different beams.

[0015] In one embodiment, multiple monitoring occasions included within a time interval in which WUS can be monitored may each be associated with different UE groups.

[0016] According to one embodiment, the method of the UE may further include the step of reporting capability information to the base station indicating that the UE is capable of activating MR using WUR.

[0017] According to one embodiment, the capability information may be reported to the base station via a UE Capability Information message, via a random access preamble (Message 1) during a random access procedure, or via an uplink data channel (Message 3) during a random access procedure.

[0018] In a wireless communication system according to one embodiment, a method of a base station is provided. The method of the base station may include the step of transmitting, to a user equipment (UE), a wake-up signal (WUS), the WUS including information indicating activation (ON) or deactivation (OFF) of a main radio (MR) of the UE. The MR of the UE may be activated or deactivated based on the WUS.

[0019] In a wireless communication system according to one embodiment, a user equipment (UE) is provided. The UE may include a memory in which a program or at least one instruction is stored; and at least one processor. According to one embodiment, the at least one processor, alone or in cooperation, executes the program or at least one instruction stored in the memory, whereby the UE receives, from a base station, a wake-up signal (WUS) through a wake-up receiver (WUR), the WUS including information indicating activation (ON) or deactivation (OFF) of a main radio (MR), activates or deactivates the MR based on the WUS, and, when the MR is activated, receives downlink data through the MR.

[0020] According to one embodiment, the UE is configured to: when deactivating an MR, reset a Medium Access Control (MAC) layer of the MR; release an RRC (Radio Resource Control) configuration for standalone operation of the MR; maintain an RRC configuration for MR operation via WUR; start a timer based on deactivation of the MR and a timer based on activation of the WUR; flush a HARQ (Hybrid Automatic Repeat request) soft buffer of serving cells; reset, stop, or restart relevant timers of a UE in an RRC connected or RRC idle / inactive state; stop monitoring or receiving a downlink signal; maintain monitoring or transmitting an uplink signal; stop monitoring a PDCCH (Physical Downlink Control CHannel) of the MR; stop measuring a serving cell by the MR and perform measuring a serving cell by the WUR; or perform MAC reconfiguration of the MR or the WUR; You can do at least one of these.

[0021] According to one embodiment, the UE may perform at least one of the following: when activating the MR, by at least one processor further executing a program or at least one instruction stored in a memory; resetting a MAC layer of the MR; maintaining an RRC configuration for standalone operation of the MR and releasing an RRC configuration for MR operation via WUR; starting a timer based on activation of the MR; flushing HARQ soft buffers of serving cells; resetting, stopping, or restarting relevant timers of the UE in RRC connected or RRC idle / inactive state; resuming monitoring or reception of downlink signals; maintaining monitoring or transmission of uplink signals; resuming PDCCH monitoring of the MR; performing serving cell measurement by the MR and stopping serving cell measurement by the WUR; performing MAC reconfiguration of the MR; or stopping a timer for operation of the WUR.

[0022] According to one embodiment, the UE may receive, from the base station, information about a time interval during which a WUS can be monitored; information about a monitoring occasion during which a WUS can be detected; and information about a period during which the time interval repeats, by at least one processor executing, alone or in cooperation, a program or at least one instruction stored in a memory.

[0023] In a wireless communication system according to one embodiment, a base station is provided. The base station may include a memory in which a program or at least one instruction is stored; and at least one processor. According to one embodiment, the at least one processor, alone or in cooperation, executes the program or at least one instruction stored in the memory, thereby transmitting a wake-up signal (WUS) including information indicating activation (ON) or deactivation (OFF) of a main radio (MR) of the UE to a user equipment (UE). The MR of the UE may be activated or deactivated based on the WUS.

[0024] FIG. 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system according to one embodiment of the present disclosure.

[0025] FIG. 2 illustrates a time domain mapping structure and beam sweeping operation of a synchronization signal according to one embodiment of the present disclosure.

[0026] FIG. 3 illustrates a signal flow for random access (RA) according to one embodiment of the present disclosure.

[0027] FIG. 4 illustrates a signal flow for a terminal to report terminal capability information to a base station according to one embodiment of the present disclosure.

[0028] 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.

[0029] FIG. 6 illustrates an example of the operation of a terminal having a wake-up receiver according to one embodiment of the present disclosure.

[0030] FIG. 7 illustrates an operation flow of a terminal equipped with a wake-up receiver according to one embodiment of the present disclosure.

[0031] FIG. 8 illustrates an operational flow for a base station according to one embodiment of the present disclosure.

[0032] FIG. 9 illustrates the structure of a terminal according to various embodiments of the present disclosure.

[0033] FIG. 10 illustrates the structure of a base station according to various embodiments of the present disclosure.

[0034] 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.

[0035] In describing the embodiments of this disclosure, descriptions of technical details that are well known in the technical field to which this disclosure pertains and are not directly related to this disclosure will be omitted. This is to more clearly convey the gist of this disclosure without obscuring it by omitting unnecessary explanations.

[0036] 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.

[0037] 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 together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0038] 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).

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] In the following description, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, while the term "physical downlink shared channel" (PDSCH) refers to a physical channel through which data is transmitted, the term "PDSCH" may also be used to refer to data. For example, 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."

[0044] 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).

[0045] Furthermore, while the present 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 the present disclosure can be easily modified and applied to other communication systems. Furthermore, the term "terminal" can refer to mobile phones, smartphones, Internet of Things (IoT) devices, sensors, and other wireless communication devices.

[0046] 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.

[0047] To handle the explosive growth in mobile data traffic, the initial standards for the 5G (5th Generation) system, or New Radio access technology NR), the next-generation communication system following LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution), have been completed. While existing mobile communication systems have focused on conventional voice / data communications, the 5G system aims to satisfy various services and requirements, such as enhanced Mobile Broadband (eMBB) services for improving existing voice / data communications, Ultra-Reliable and Low Latency Communication (URLLC) services for high reliability / ultra-low latency communications, and massive Machine Type Communication (MTC) services for supporting large-scale machine-to-machine communications.

[0048] 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, where securing ultra-wide bandwidth frequencies is relatively easy, as candidate frequencies. Additionally, wide bandwidth frequencies for the 5G system can be secured through frequency reallocation or allocation among frequency bands ranging from several hundred MHz to several GHz used in existing mobile communication systems.

[0049] 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.

[0050] 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. For example, 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.

[0051] 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 time unit 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.

[0052] FIG. 1 illustrates the basic structure of a time-frequency resource domain in a wireless communication system according to one embodiment of the present disclosure. Specifically, FIG. 1 is a diagram illustrating the basic structure of a time-frequency resource domain, which is a wireless resource domain in which data or control channels of a 5G system are transmitted.

[0053] 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.

[0054] The basic unit of resources in the time-frequency domain is a Resource Element (RE) (112), which can be represented by an OFDM symbol index and a subcarrier index. A Resource Block (RB or Physical Resource Block, PRB) is a resource block in the frequency domain. can be defined as a series of consecutive subcarriers (110). In the 5G system = 12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0055] In wireless communication systems, a base station maps data in RB units and can perform scheduling on RBs, which typically constitute a slot for a given terminal. For example, 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.

[0056] 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 regular CP, allowing for maintaining orthogonality between symbols. In the case of regular 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. For example, 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.

[0057] 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.

[0058] 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.

[0059] [Table 1] below shows the relationship between the subcarrier spacing configuration (μ), subcarrier spacing (△f), and CP length supported in the 5G system.

[0060] [Table 1]

[0061]

[0062] [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.

[0063] [Table 2]

[0064]

[0065] [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.

[0066] [Table 3]

[0067]

[0068] 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 could provide enhanced services to terminals. Therefore, the 5G system's frame structure must at least include the LTE / LTE-A frame structure or essential parameter set (e.g., subcarrier spacing = 15 kHz).

[0069] 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.

[0070] 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.

[0071] The frame structure can be applied to various scenarios. From the perspective of cell size, the longer the CP length, the larger the cell can be supported, so frame structure A can support relatively larger cells than frame structure B. From the perspective of operating frequency band, the larger the subcarrier spacing, the more advantageous it is for recovering phase noise in the high-frequency band, so frame structure B can support relatively higher operating frequencies than frame structure A. From the perspective of service, the shorter the slot length, which is the basic time unit of scheduling, the more advantageous it is for supporting ultra-low-latency services such as URLLC, so frame structure B can be relatively more suitable for URLLC services than frame structure A.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] FIG. 2 illustrates a time domain mapping structure and beam sweeping operation of a synchronization signal according to one embodiment of the present disclosure.

[0076] Hereinafter, the following components may be predefined for the purpose of explaining the present disclosure.

[0077] - PSS (Primary Synchronization Signal): A signal that serves as the basis for DL ​​time / frequency synchronization and can provide some cell ID information.

[0078] - SSS (Secondary Synchronization Signal): This serves as a reference for DL ​​time / frequency synchronization and can provide some remaining information, including the cell ID. Additionally, it can serve as a reference signal for PBCH demodulation.

[0079] - PBCH (Physical Broadcast Channel): It can provide MIB (Master Information Block), which is essential system information required for transmission and reception of data channels and control channels of the terminal. Essential system information can include control information related to the search space indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel that transmits system information, and SFN (System Frame Number), which is a frame unit index that serves as a timing reference, etc.

[0080] - 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.

[0081] FIG. 2 illustrates an example in which beam sweeping is applied to SS / PBCH block units over time. In the example of FIG. 2, terminal 1 (205) can receive an SS / PBCH block using a beam radiated in the direction of #d0 (203) by beamforming applied to SS / PBCH block #0 at time t1 (201). Terminal 2 (206) can receive an SS / PBCH block using a beam radiated in the direction of #d4 (204) by beamforming applied to SS / PBCH block #4 at time t2 (202). The terminal can obtain an optimal synchronization signal through a beam radiated from the base station in the direction where the terminal is located. For example, terminal 1 (205) may have difficulty in obtaining time / frequency synchronization and essential system information from an SS / PBCH block through a beam radiated in the direction of #d4, which is far from the location of terminal 1.

[0082] 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.

[0083] 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.

[0084] FIG. 3 illustrates a signal flow for random access (RA) according to various embodiments of the present disclosure.

[0085] 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.

[0086] In step 320, the base station may transmit a Random Access Response (RAR) (or message 2) in response to the random access preamble received in step 310. The base station may transmit an uplink transmission timing adjustment command to the terminal based on a transmission delay value measured from the random access preamble. The base station may transmit to the terminal an uplink resource to be used 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.

[0087] 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 the transmission power increased by a predetermined step (e.g., power ramping).

[0088] In step 330, the terminal can transmit uplink data including its terminal ID (e.g., 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 can 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 can be determined in consideration of 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 can mean the first uplink data signal that the terminal transmits to the base station after transmitting the random access preamble.

[0089] In step 340, if the base station determines that the terminal has performed random access without collision with other terminals, the base station may transmit data (e.g., message 4) including the ID of the terminal that transmitted uplink data in step 330 to the terminal. If the terminal receives the signal transmitted by the base station in step 340 from the base station, the terminal may determine that the random access is successful. The terminal may transmit HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement) information indicating whether message 4 was successfully received to the base station through an uplink control channel (Physical Uplink Control Channel, PUCCH).

[0090] 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.

[0091] When a terminal successfully completes a random access procedure, the terminal transitions to a connected state (or RRC_CONNECTED state), and one-to-one communication can be enabled between the base station and the terminal. The base station can receive terminal capability (UE capability) information from the terminal in the connected state (or RRC_CONNECTED state) and adjust scheduling by referring to the terminal capability (UE capability) information of the corresponding terminal. Through the terminal capability (UE capability) information, the terminal can inform the base station whether it supports a certain function, the maximum allowable value of the function supported by the terminal, etc. Therefore, the terminal capability (UE capability) information reported by each terminal to the base station can have different values ​​for each terminal.

[0092] For example, a terminal may report terminal capability information including at least one of the following control information to a base station.

[0093] - Control information related to frequency bands supported by the terminal

[0094] - Control information related to channel bandwidth supported by the terminal

[0095] - Control information related to the maximum modulation method supported by the terminal

[0096] - Control information related to the maximum number of beams supported by the terminal

[0097] - Control information related to the maximum number of layers supported by the terminal

[0098] - Control information related to CSI reporting supported by the terminal

[0099] - Control information on whether the terminal supports frequency hopping

[0100] - Bandwidth-related control information when supporting carrier aggregation (CA)

[0101] - Control information on whether cross carrier scheduling is supported when carrier aggregation is supported.

[0102] FIG. 4 illustrates a signal flow for a terminal to report terminal capability information to a base station according to various embodiments of the present disclosure.

[0103] 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).

[0104] Based on the process of transmitting and receiving terminal capability information, a terminal connected to a base station can communicate one-to-one with the base station as a terminal in an RRC_CONNECTED state. A terminal in the RRC_CONNECTED state can monitor a downlink control channel (Physical Downlink Control Channel, PDCCH). If DRX (Discontinuous Reception) is not configured by the base station, the MAC entity of the terminal can continuously monitor the PDCCH. If DRX is configured to the MAC entity of the terminal by an upper layer signal from the base station, the MAC entity of the terminal can discontinuously monitor the PDCCH using the DRX operation for all activated serving cells. The terminal can receive DRX operation related parameters (e.g., at least one of DRX cycle, drx-onDurationTimer, drx-InactivityTimer, or drx-SlotOffset) from the base station through an upper signal, and can discontinuously monitor the PDCCH based on the parameters. In the present disclosure, the terminal in the RRC_CONNECTED state monitoring the PDCCH with DRX can be said to perform a C-DRX (CONNECTED-DRX) operation, or can be expressed as performing C-DRX.

[0105] The terminal set to the above DRX can be set by a higher-order signal to receive an instruction via DCI format 2_6 (or DCP) as to whether to perform PDCCH monitoring in the upcoming drx-onDurationTimer. With regard to receiving the DCI format 2_6, the DCI format 2_6 was introduced to reduce terminal power consumed while periodically monitoring the PDCCH in every C-DRX cycle. The terminal can monitor or receive the DCI format 2_6 before the drx-onDurationTimer arrives during the C-DRX cycle. The terminal can receive an indication of whether the upcoming drx-onDurationTimer starts via a specific bit field in the DCI format 2_6, and if the drx-onDurationTimer does not start, the terminal can reduce terminal power consumption by not performing PDCCH monitoring during the drx-onDurationTimer. The terminal can receive information such as resource information, search space information, and payload size for receiving the above DCI format 2_6 through settings by an upper signal.

[0106] The terminal in the RRC_CONNECTED state or the MAC entity of the terminal may transmit aperiodic CSI and aperiodic SRS transmitted on the PUSCH when set by HARQ feedback, an upper layer signal, or indicated by the PDCCH after receiving downlink data, regardless of whether the terminal monitors the PDCCH in the serving cell in the DRX group. Unlike the uplink signals that directly affect downlink data reception, such as the HARQ feedback, or are transmitted aperiodically, such as the aperiodic CSI or aperiodic SRS, uplink transmission may be restricted to be performed only during the time when the PDCCH is monitored, for uplink signals that are transmitted periodically or have a smaller importance than the uplink signals. For example, if the MAC entity of the terminal in the RRC_CONNECTED state is not in active time during one OFDM symbol, i.e., if it is not a time to monitor the PDCCH within drx-onDurationTimer or drx-InactivityTimer, the MAC entity of the terminal may not transmit the periodic SRS and semi-persistent SRS set by the upper signal, and may not report the CSI transmitted on the PUCCH set by the upper signal and the semi-persistent CSI set to be transmitted on the PUSCH to the base station. To explain in more detail,

[0107] ● If DCP monitoring is set for active BWP, the current symbol n occurred within the drx-onDurationTimer period, and the drx-onDurationTimer associated with the current DRX cycle has not started,

[0108] - If the MAC entity is determined to be not within the Active Time considering the grants / assignments / DRX Command MAC CE / Long DRX Command MAC CE received up to 4ms before symbol n and the transmitted Scheduling Request, and if the upper signal allowCSI-SRS-Tx-MulticastDRX-Active or cfr-ConfigMulticast is not set for any active BWP of the serving cell,

[0109] * Periodic SRS and semi-persistent SRS set by the upper signal are not transmitted to the base station.

[0110] * Semi-persistent CSI set to be transmitted on PUSCH by upper signal is not reported to the base station.

[0111] * If the upper signal ps-TransmitPeriodicL1-RSRP is not set to true, the periodic CSI, which is L1-RSRP set to be transmitted on PUCCH by the upper signal, is not reported to the base station.

[0112] * If the upper signal ps-TransmitOtherPeriodicCSI is not set to true, periodic CSI other than L1-RSRP that is set to be transmitted on PUCCH by the upper signal is not reported to the base station.

[0113] ● In other cases,

[0114] - If, at the current symbol n, the DRX group is determined to be not within the Active Time by considering the scheduled grants / assignments and the received DRX Command MAC CE / Long DRX Command MAC CE and the transmitted Scheduling Request from the serving cell of the DRX group received up to 4 ms before symbol n, and no upper signal allowCSI-SRS-Tx-MulticastDRX-Active or cfr-ConfigMulticast is set for any active BWP of the serving cell,

[0115] * Periodic SRS and semi-persistent SRS set by upper signals in the above DRX group are not transmitted to the base station.

[0116] * Semi-persistent CSI set to be transmitted on PUSCH in the above DRX group is not reported to the base station.

[0117] * CSI set to be transmitted on PUCCH by upper signal in the above DRX group is not reported to the base station.

[0118] In another example, if the CSI Mask is set to the terminal by an upper layer signal, the terminal may be further restricted to transmit the uplink signals (periodic SRS, semi-persistent SRS, CSI on PUCCH, semi-persistent CSI on PUSCH) only during the time within the drx-onDurationTimer. To be more specific,

[0119] ● When CSI masking (csi-Mask) is set by the upper signal,

[0120] - If the drx-onDurationTimer of the DRX group does not operate in consideration of the scheduled grants / assignments and the received DRX Command MAC CE / Long DRX Command MAC CE from the serving cell of the DRX group received 4ms before symbol n at the current symbol n, and the upper signal allowCSI-SRS-Tx-MulticastDRX-Active or cfr-ConfigMulticast is not set for any active BWP of the serving cell,

[0121] * CSI set to be transmitted on PUCCH by upper signal in the above DRX group is not reported to the base station.

[0122] When DRX is set by a higher level signal, the Active Time for the serving cell of the DRX group may include the following times:

[0123] ● The time during which drx-onDurationTimer or drx-InactivityTimer set for the above DRX group is running.

[0124] ● The time during which a Scheduling Request is sent on PUCCH and is pending.

[0125] By transmitting the SRS or the CSI only during the Active time or within the drx-onDurationTimer, it is possible to allocate resources set for transmitting the SRS or the CSI at other times to other terminals, thereby maximizing resource utilization of the base station.

[0126] Conversely to the RRC_CONNECTED state, a terminal that is not connected may be in the RRC_IDLE state, and a terminal in the RRC_IDLE state can perform the following process.

[0127] - When a terminal-specific DRX (Discontinuous Reception) cycle set by a higher layer is performed, a terminal in RRC_IDLE state performing a DRX cycle is said to perform an I-DRX (IDLE-DRX) operation, or can be expressed as performing I-DRX.

[0128] - Receive paging messages from the core network

[0129] - Obtain system information

[0130] - Measurement behavior related to serving cell (or camping cell) and cell selection / reselection

[0131] - Measurement operations related to surrounding cells and cell reselection

[0132] - Receiving PEI (Paging Early Indication)

[0133] More specifically, regarding the measurement operation and cell selection / reselection related to the serving cell (or the cell on which it is camping), the UE can measure SS-RSRP and SS-RSRP level for the serving cell (or the cell on which it 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) cycle is greater than 20ms and the DRX cycle is less than or equal to 0.64s, M1=2, and otherwise, M1=1.

[0134] N1 can be determined by the following table.

[0135] [Table 4]

[0136]

[0137] The cell selection criterion S can be satisfied when Srxlev > 0 corresponding to SS-RSRP and Squal > 0 corresponding to SS-RSRQ.

[0138] Srxlev = Qrxlevmeas - (Qrxlevmin + Qrxlevminoffset) - Pcompensation - Qoffsettemp,

[0139] Squal = Qqualmeas - (Qqualmin + Qqualminoffset) - Qoffsettemp

[0140] Here, Qrxlevmeas is the measured SS-RSRP, Qqualmeas is the measured SS-RSRQ, Qrxlevmin is the minimum required magnitude level of the received signal in the serving cell and can be received by the UE as system information, and Qqualmin is the minimum required quality level of the received signal in the serving cell and can be received by the UE as system information. The remaining parameters are presented in 3gpp TS 38.304. The UE 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 UE 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.

[0141] If the terminal determines that the serving cell does not satisfy the cell selection criterion S during consecutive DRX cycles of Nserv, the terminal may initiate measurement of all surrounding cells other than the serving cell. If the terminal does not find a new suitable cell for 10 s, the cell selection procedure for the selected PLMN (Public Land Mobile Network) may be initiated.

[0142] Next, with regard to receiving a paging message from the core network, the terminal can monitor one paging occasion (PO) during a DRX cycle. A PO is a set of PDCCH monitoring occasions and can consist of multiple time slots (subframes or OFDM symbols) in which paging control information can be received. A paging frame (PF) is one radio frame (10 ms) and can include one or more POs or the starting points of POs.

[0143] PF and PO can be determined by the following formulas:

[0144] The SFN (System Frame Number) for PF is determined by (SFN + PF_offset) mod T = (T div N)*(UE_ID mod N), where PF_offset is an offset for PF determination, T is a DRX cycle, N is the number of PFs (cell common or cell specific) per DRX cycle, which is determined by higher-level signals such as system information, and UE_ID is a terminal ID (5G-S-TMSI) determined by the core network. The PFs determined by the above N refer to paging frames commonly applied to terminals within a cell, and are referred to as cell common PFs in the present disclosure.

[0145] i_s, which indicates the PO index, is determined by i_s = floor(UE_ID / N) mod Ns, where Ns represents the number of POs in one PF and can be determined by a higher-level signal such as system information.

[0146] As an example, if PF_offset=3, T=128, N=T / 4=32, Ns=4, and UE_ID mod 32 is 1, and floor (UE_ID / 32) mod 4 is 1, then

[0147] (SFN + 3) mod 128 = (128 div 32) * (UE_ID mod 32) = 4*1 = 4,

[0148] i_s = floor (UE_ID / 32) mod 4 = 1

[0149] can be determined. Therefore, the PF, which is a paging frame that the terminal with the UE_ID must receive, is determined as a radio frame with SFN of 1, 129, 257, ... among the common PFs of the cell, and the PO can be determined as the (i_s + 1)th PO among the four POs in the PF.

[0150] Next, with regard to receiving PEI (Paging Early Indication), PEI was introduced to reduce terminal power consumption while monitoring and receiving paging control channels and paging data channels in each DRX cycle. The terminal can monitor or receive one PEI Occasion (PEI-O) before receiving paging during a DRX cycle. If the terminal receives PEI and the PEI indicates a paging reception subgroup to which the terminal belongs, the terminal can monitor the associated paging occurrence (PO). If the terminal does not detect the PEI in the PEI occurrence or the PEI does not indicate a paging reception subgroup to which the terminal belongs, the terminal does not need to monitor the associated paging occurrence (PO), thereby reducing terminal power consumption. The terminal can determine the PEI occurrence as follows. The PEI occurrence is located behind the radio frame of the reference point by a subframe offset based on the radio frame of the reference point that is located ahead by a pei-FrameOffset based on the PF that includes the associated PO, and the terminal can monitor the PEI in the PEI occurrence determined by the above method. The pei-FrameOffset, subframe offset, etc. can be determined by a higher-order signal such as system information.

[0151] 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:

[0152] - Storage of AS (Access stratum) information required for cell connection

[0153] - Terminal-specific DRX cycle operation set by the RRC layer

[0154] - Setting up and periodically updating RNA (RAN (radio access network)-based notification area) that can be utilized during handover by the RRC layer

[0155] - Monitoring RAN-based paging messages transmitted via I-RNTI (inactive-radio network temporary identifier)

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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 the Physical Downlink Control Channel (PDCCH).

[0160] 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, for the terminal to be scheduled.

[0161] The base station can transmit downlink data to the 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 domain of the PDSCH, modulation method, HARQ-related control information, and power control information through DCI related to downlink data scheduling information among the DCI transmitted via the PDCCH.

[0162] 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 specific mapping locations in the time and frequency domains of the PUSCH, modulation schemes, HARQ-related control information, and power control information through DCI related to uplink data scheduling information among the DCI transmitted via the PDCCH.

[0163] 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 UE 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 UE 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 UE, this may mean that the base station provides the UE with information such as a CORESET identifier (Identity), the frequency location of the CORESET, and the symbol length of the CORESET. The information that the base station provides to the UE to configure the CORESET may include at least some of the information included in [Table 5] below.

[0164] [Table 5]

[0165]

[0166]

[0167] 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 a 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.

[0168] 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 in units of REG bundles. A REG bundle can be defined as a set of one or more REGs. The terminal can determine the CCE-to-REG mapping method in 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.

[0169] [Table 6]

[0170]

[0171] 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.

[0172] 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 to detect a signal without knowing information about the downlink control channel, and for this purpose, a search space representing a set of CCEs can be defined. 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.

[0173] 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 the System Information Block (SIB) or paging messages. For example, a UE can receive scheduling allocation information for the PDSCH for receiving system information 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 the PDSCH or PUSCH can be received by the UE 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's identity (ID) and various system parameters.

[0174] The base station can set the configuration information for the PDCCH search space to the terminal through higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can set 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.

[0175] [Table 7]

[0176]

[0177]

[0178] 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.

[0179] 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.

[0180] 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.

[0181] - 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

[0182] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0183] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0184] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0185] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0186] 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.

[0187] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0188] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0189] 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.

[0190] - C-RNTI (Cell RNTI): For terminal-specific PDSCH or PUSCH scheduling purposes.

[0191] - TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes.

[0192] - CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0193] - RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0194] - P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0195] - SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0196] - INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0197] - TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0198] - TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0199] - TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0200] The DCI formats described above can follow the definitions shown in [Table 8] below.

[0201] [Table 8]

[0202]

[0203] CORESET p, the search space of aggregation level L in the search space set s can be expressed as the following mathematical formula.

[0204] [Mathematical Formula 1]

[0205]

[0206] - L: Integration level

[0207] - nCI: Carrier Index

[0208] - NCCE,p: Total number of CCEs within the control resource set p

[0209] - nμs,f: slot index

[0210] - M(L)p,s,max: Number of PDCCH candidates for aggregation level L

[0211] - msnCI = 0, ..., M(L)p,s,max -1: PDCCH candidate index of aggregation level L

[0212] - I = 0, ..., L-1

[0213] - , , , , , D=65537

[0214] - nRNTI: Terminal identifier

[0215] The value can be 0 for a common search space.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] In one embodiment, the power consumption of a 5G terminal depends on the configured length of wake-up periods (e.g., paging cycles), and a large extended discontinuous reception (eDRX) cycle may be used to meet battery life requirements. However, the eDRX approach relies on high latency to maintain long battery life, making it unsuitable for low-latency services. For example, in a fire detection and extinguishing use case, fire shutters may need to be closed and sprinklers may need to be turned on by actuators within 1-2 seconds of a fire being detected by a sensor. In this case, latency may be critical, and a long eDRX cycle, as in the past, may not be suitable because it cannot meet the latency requirements.

[0220] FIG. 5 illustrates an example of state transitions between a base station and a terminal, and the state of a terminal according to the base station state, according to various embodiments of the present disclosure. Specifically, FIG. 5 illustrates state transitions between a base station and a terminal to address the aforementioned issues.

[0221] In one embodiment, a 5G terminal may require one wake-up per eDRX cycle, and when the terminal wakes up once per eDRX cycle, the power consumption resulting from this may account for most of the terminal power consumption during periods without signaling or data traffic. Therefore, if the terminal can wake up only when triggered, such as by paging, the power consumption of the terminal can be drastically reduced. According to one embodiment of the present disclosure, a method for reducing power consumption can be achieved by triggering a main radio (e.g., a legacy NR radio or MR (main radio)) using a wake-up signal (WUS), as shown in FIG. 5. Specifically, the method may include a method of turning on the main radio only when data transmission and reception are required, using a separate receiver capable of monitoring the WUS, a wake-up receiver (WUR or LR (LP-WUR, Low Power Wake-Up Receiver)). In the present disclosure, the main radio (504) may mean a receiver that receives the main radio, and the wake-up receiver (502) may mean a receiver that receives a wake-up signal.

[0222] According to one embodiment of the present disclosure, in step 501, the base station may transmit a WUS corresponding to ON or OFF to the terminal. According to one embodiment, before step 501, the base station may periodically transmit a WUR-dedicated synchronization signal (referred to as a Low Power-Synchronization Signal (LP-SS) in the present disclosure, or a new synchronization signal, etc.) so that the terminal can synchronize time or frequency in the WUR when receiving the WUS.

[0223] In step 502, the terminal can receive the WUS using the WUR. In one embodiment, the terminal can synchronize the time or frequency of the WUR by receiving a WUR-specific synchronization signal or an existing synchronization signal before receiving the WUS.

[0224] At step 503, the terminal can trigger a state change of the main radio, which is OFF or ON, based on information that the received signal corresponds to ON or OFF.

[0225] At step 504, the terminal can set the main radio to wake up or turn off. In one embodiment, it can be set to a deep sleep (DS) or ultra deep sleep (UDS) state rather than completely OFF.

[0226] In step 505, if data traffic to be transmitted from the base station to the terminal occurs, the WUS transmitted by the base station in step 501 is ON, the main radio can be ON in step 504, and the terminal can receive the data transmitted by the base station through the main radio, not the WUR, in step 506.

[0227] According to one embodiment of the present disclosure, the power consumption for monitoring WUS depends on the WUS design, the hardware modules of WUR used for WUS signal detection and processing, and thus the power consumption savings benefits can be maximized for power-sensitive and small form factor devices including IoT use cases (such as industrial sensors and controllers) and wearable devices.

[0228] According to one embodiment of the present disclosure, a terminal including a wake-up receiver may report to a base station that it has the capability to wake up the main radio using the wake-up receiver or may report capability information indicating that the terminal includes a wake-up receiver to the base station. According to one embodiment of the present disclosure, the capability of the terminal to wake up the main radio using the wake-up receiver or the capability of the terminal including the wake-up receiver may be included in terminal capability information.

[0229] According to one embodiment of the present disclosure, a terminal may report capability information about a wake-up receiver to a base station through the terminal capability information reporting procedure of FIG. 4.

[0230] According to one embodiment of the present disclosure, a terminal may report capability information regarding a wake-up receiver to a base station through at least one step of a random access preamble or an uplink data channel in the random access procedure of FIG. 3. According to one embodiment, sets of random access preambles that a terminal including a wake-up receiver can transmit may be transmitted to the terminal as system information. The terminal may select a random access preamble from the set received by the terminal, and transmit a random access preamble based on the selected random access preamble in step 310 of the random access procedure of FIG. 3. According to one embodiment, after reporting capability information regarding a wake-up receiver to the base station, the terminal may receive information indicating whether to use the wake-up receiver from the base station through higher layer signaling or a physical signal.

[0231] According to one embodiment of the present disclosure, when a base station supports a terminal including a wake-up receiver (e.g., when the base station has hardware capable of transmitting a wake-up signal), the base station may determine whether to use the wake-up receiver after receiving capability information about the wake-up receiver from the terminal. According to one embodiment, the base station may transmit a signal indicating whether to use the wake-up receiver or setting information for receiving the wake-up signal to the terminal. According to one embodiment, the base station may transmit to the terminal at least one of instruction information indicating reception of the wake-up signal by the terminal or activation of the wake-up receiver by the terminal, or instruction information indicating transmission of the wake-up signal by the base station.

[0232] According to one embodiment of the present disclosure, a terminal may turn off a main radio and turn on a wake-up receiver for monitoring a wake-up signal after a slot (e.g., a slot offset) set by a base station (or defined in a standard) from a slot in which a signal is received. According to one embodiment, before turning off the main radio, the terminal may transmit to the base station at least one of feedback indicating that a signal indicating whether to use the wake-up receiver has been received or feedback indicating that the main radio has been turned off and the wake-up receiver has been turned on.

[0233] According to one embodiment of the present disclosure, when a base station does not support a terminal having a wake-up receiver, the base station may receive capability information about the wake-up receiver from the terminal and then transmit a signal to the terminal indicating that the wake-up receiver is unusable. The terminal may transmit feedback to the base station indicating that it has received the signal indicating that the wake-up receiver is unusable. According to one embodiment, the terminal may perform an operation according to parameters of the existing power saving method set by the base station using an existing power saving method (e.g., C-DRX or I-DRX such as paging).

[0234] According to various embodiments of the present disclosure, after a capability report of a terminal having a wake-up receiver and a procedure for determining whether the wake-up receiver is supported (or permitted) by a base station, the wake-up receiver of the terminal may perform an operation of turning on and off the main radio of the terminal by receiving a wake-up signal. In one embodiment, the terminal may independently perform the operation of turning on / off the main radio, the operation of reporting the capability of the terminal having the wake-up receiver, or the operation procedures for determining whether the wake-up receiver is supported by the base station. For example, even if the capability report operation and the permission procedure of the terminal are not performed, the base station may transmit a signal to the terminal indicating whether to use the wake-up receiver (or an activation / deactivation instruction) or configuration information for receiving a wake-up signal. Accordingly, among terminals receiving a wake-up signal from a base station, a terminal having a wake-up receiver may perform an operation of turning on / off the main radio based on the wake-up signal received through the wake-up receiver.

[0235] According to one embodiment of the present disclosure, after the capability report operation of the terminal and the base station authorization procedure are performed, the operation of the terminal performing on / off of the main radio through the wake-up receiver can be applied to all terminals (e.g., RRC_CONNECTED terminals, RRC_IDLE / RRC_INACTIVE terminals) within the cell supported by the base station. If the capability report operation of the terminal and the base station authorization procedure are not performed, the operation of the terminal performing on / off of the main radio through the wake-up receiver can be applied to RRC_IDLE / RRC_INACTIVE terminals camping within the cell supported by the base station.

[0236] According to one embodiment of the present disclosure, an RRC_IDLE / RRC_INACTIVE terminal or an RRC_CONNECTED terminal camping within a cell supported by a base station may measure a new or existing synchronization signal through a main radio or a wake-up receiver, and then compare the measured value with a reference value set as an upper signal from the base station. If the measured value is less than the set reference value, the terminal may determine not to operate the wake-up receiver, i.e., deactivate or turn off the wake-up receiver. Alternatively, if the measured value is greater than the set reference value, the terminal may determine to operate the wake-up receiver, i.e., activate or operate or turn on the wake-up receiver.

[0237] Additionally, 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 disclosed below.

[0238] At this time, it is possible to consider a situation in which a C-DRX is set to perform discontinuous monitoring of a downlink channel (e.g., PDCCH) in a terminal in RRC_CONNECTED, or a related parameter is set as a higher-order signal so that a terminal in RRC_IDLE / INACTIVE can perform paging or PEI (paging early indication) monitoring. At the same time, when the main radio is kept in a sleep state in a situation in which the wake-up signal is set to be received through a wake-up receiver, a necessary terminal operation can be proposed. Specifically, the present disclosure defines the operations of the main radio and the wake-up receiver, and proposes a method and apparatus for a terminal to receive a wake-up signal by the terminal operation and transmit a 5G channel and signal in the main radio.

[0239] In describing the embodiments below, operations or procedures expressed as being performed by the main radio or the wake-up receiver for a terminal equipped with a wake-up receiver (e.g., a terminal having the capability of wake-up reception) may also be understood as being performed by the terminal equipped with the wake-up receiver (e.g., a terminal having the capability of wake-up reception). In the present disclosure below, a downlink signal may include control information (e.g., DCI) and / or data transmitted from a base station to a terminal. For example, a downlink signal may refer to a channel (e.g., PDCCH, PDSCH) for transmitting control information and / or data. In addition, an uplink signal may include control information (e.g., UCI) and / or data transmitted from a terminal to a base station. For example, an uplink signal may refer to a channel (e.g., PUCCH, PUSCH) for transmitting control information and / or data. Of course, the present invention is not limited to the above examples.

[0240] Hereinafter, various embodiments of the present disclosure will be described to describe operations for turning on and off the main radio of a terminal having a wake-up receiver. Various embodiments of the present disclosure may include at least one of all, some, or a combination of some of the various operations of a terminal and a base station including the wake-up receiver disclosed below.

[0241] FIG. 6 illustrates a method for receiving a wake-up signal of a terminal having a wake-up receiver according to one embodiment of the present disclosure.

[0242] Referring to FIG. 6, the terminal in FIG. 6 includes a main radio (601) (e.g., MR) and a wake-up receiver (602) (e.g., LR). In the present disclosure, the main radio (601) may refer to a receiver that receives the main radio, and the wake-up receiver (602) may refer to a receiver that receives a wake-up signal. The main radio (601) may be configured to be in an RRC_CONNECTED state by an upper signal from a base station, and a situation in which C-DRX is configured by the upper signal may be considered. Alternatively, a situation in which the main radio (601) is configured to be in an RRC_IDLE / INACTIVE state by a base station or a related parameter is received by an upper signal may be considered. The wake-up receiver (602) can be operated by an LO (LP-WUS occasion) (611, 621) that informs a time resource to perform monitoring so that a wake-up signal can be monitored, an MO (LP-WUS monitoring occasion) (614) that can detect a wake-up signal within the LO, and a periodicity (612) that is a cycle set to repeat monitoring in the LO.

[0243] In FIG. 6, the terminal (600) can receive wake-up receiver configuration information from the base station. When the terminal (600) is instructed to activate the wake-up receiver from the base station or the terminal (600) activates the wake-up receiver, when the terminal is in the RRC_IDLE state, the main radio (601) of the terminal (600) can be turned off without performing PEI or paging monitoring. That is, it can be turned off. Alternatively, when the terminal is in the RRC_CONNECTED state, the main radio (601) of the terminal (600) can be turned off without performing C-DRX configured by the base station. That is, it can be turned off.

[0244] Instead, the wakeup receiver (602) of the terminal (600) can monitor the wakeup signal from the MO (614) during the LO (611, 621) interval for each periodicity (612). The consecutive MOs of the LO (611, 621) may be time resources for reception of wakeup signals transmitted in different beams (i.e., a wakeup signal containing the same information is transmitted in the first MO by being quasi-co-located to the LP-SS or SSB transmitted in beam 1, and in the second MO by being QCLed to the LP-SS or SSB transmitted in beam 2), or may be time resources for reception of wakeup signals transmitted in different groups (i.e., a wakeup signal containing information of group 1 is transmitted in the first MO, and a wakeup signal containing information of group 2 is transmitted in the second MO).

[0245] When the wake-up receiver (602) receives a wake-up signal through the LO and MO, the terminal (600) can turn on the main radio (601), i.e., turn it on. Then, the main radio (601) can receive a downlink signal. A method for receiving the downlink signal and a specific embodiment of monitoring the wake-up signal in the LO will be described in detail below.

[0246] The main radio (601) may be turned off again by a timer set by the base station after receiving a downlink signal (e.g., a timer indicating an on-duration), may be turned off again after downlink monitoring for a period set by an upper signal, or may be turned off by an instruction included in the wakeup signal when the wakeup receiver (602) receives the wakeup signal again, i.e., may be turned off.

[0247] If the wake-up receiver (602) does not receive a wake-up signal through the LO and MO, the wake-up receiver (602) may monitor the wake-up signal only during the LO period (611, 621) and then turn off.

[0248] If the terminal (600) is instructed by the base station to deactivate the wake-up receiver, or if the terminal (600) deactivates the wake-up receiver, or if the timer for activating the wake-up receiver expires, if the terminal is in the RRC_IDLE / RRC_INACTIVE state, the main radio (601) of the terminal (600) may be turned on to monitor PEI or paging, i.e., turned on. Or, if the terminal is in the RRC_CONNECTED state, the main radio (601) of the terminal (600) may be turned on to perform C-DRX configured by the base station, i.e., turned on.

[0249] In FIG. 6, at least one of periodicity (612), LO (611, 621), MO (614) or main radio on interval indication timer, wake-up receiver activation interval indication timer can be set by an upper signal from the base station.

[0250] Although FIG. 6 considers a situation where C-DRX is set when the terminal (600) is in the RRC_CONNECTED state, according to one embodiment of the present disclosure, the above-described embodiment may also be applied even when the terminal does not have C-DRX set and performs continuous monitoring of the PDCCH. For example, if the terminal activates the wake-up receiver, the main radio of the terminal may not perform continuous PDCCH monitoring. Instead, the wake-up receiver of the terminal may monitor the wake-up signal for LOs (611, 621) every periodicity (612). The remaining terminal operations are as described in FIG. 6.

[0251] Below, various embodiments are proposed for whether the main radio (601) receives a downlink signal inside or outside the C-DRX and for the wake-up signal monitoring section in the LO (611, 621).

[0252] Example 6-1) The LO (611, 621) may be set to be positioned before the drx-onDurationTimer of the C-DRX. In this case, when the terminal receives a wake-up signal, the wake-up signal may trigger the main radio so that the terminal receives a downlink signal in the subsequent drx-onDurationTimer.

[0253] Example 6-2) The LO (611, 621) may be set to be outside the active time of C-DRX. In this case, when the terminal receives a wake-up signal, the wake-up signal may trigger the main radio so that the terminal receives a downlink signal immediately after a certain time after receiving the wake-up signal, regardless of the drx-onDurationTimer that arrives thereafter. The time period in which the downlink signal must be received after being triggered may be set by a higher-order signal.

[0254] Example 6-3) The LO (611, 621) may be set to be located within the active time of C-DRX. In this case, the wake-up signal may trigger the main radio so that the terminal receives a downlink signal immediately after a certain time after receiving the wake-up signal. The time period during which the downlink signal must be received after being triggered may be during the active time or may be set by a higher-order signal.

[0255] Example 6-4) The LO (611, 621) may be set even when C-DRX is not set for the terminal. In this case, when the terminal receives a wake-up signal, the wake-up signal may trigger the main radio so that the terminal receives a downlink signal immediately after a certain period of time after receiving the wake-up signal. The time period during which the downlink signal must be received after being triggered may be set by a higher-order signal.

[0256] The above embodiments 6-1) to 6-4) may be applied to a terminal in combination. In addition, which of the above embodiments 6-1) to 6-4) is to be applied may be set by a higher-order signal.

[0257] Next, in FIG. 6, specific examples of the operation of the terminal (600) in various situations are provided when the terminal (600) is instructed to activate the wake-up receiver from the base station or when the terminal (600) activates the wake-up receiver.

[0258] (1) Turn off the main radio (601) without performing downlink channel monitoring set from the base station of the terminal (600).

[0259] (2) After the terminal (600) receives the wake-up signal, the main radio (601) turns on.

[0260] (3-1) After the main radio (601) of the terminal (600) receives a downlink signal, it is turned off again by a timer set by the base station (e.g., a timer indicating an on period).

[0261] (3-2) The main radio (601) of the terminal (600) monitors the downlink channel for the period set by the upper signal and then turns off again.

[0262] (3-3) The wake-up receiver (602) receives the wake-up signal again and turns off the main radio (601) according to the instructions contained in the wake-up signal.

[0263] (4-1) When the wake-up receiver is instructed to be deactivated from the base station or the terminal (600) deactivates the wake-up receiver, the main radio (601) of the terminal (600) is turned on to perform downlink channel monitoring set by the base station.

[0264] (4-2) When the timer for activating the wake-up receiver expires, the main radio (601) of the terminal (600) is turned on to perform downlink channel monitoring set from the base station.

[0265] According to one embodiment of the present disclosure, when the main radio of a terminal is off, the terminal may be considered to be in a sleep period or may not receive downlink signals (or data) from the base station. According to various embodiments of the present disclosure, the main radio being 'off' may be expressed as the main radio being 'off' or the main radio being 'deactivated', and the like, but is not limited thereto, and may also be expressed with a similar or substantially equivalent meaning.

[0266] In one embodiment, deactivation of the main radio may mean that certain components of the terminal or the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned off or deactivated, or may be defined by a specification (e.g., a 3GPP TS document). However, in accordance with various embodiments of the present disclosure, without being limited to the above, deactivation of the main radio may include performing an operation by a parameter or parameters having equivalent or substantially similar contents thereto. For example, deactivation of the main radio may mean that the terminal or the main radio no longer performs a reception operation of a certain channel or signal (e.g., an SS / PBCH block including a synchronization signal or a PDCCH including a downlink control channel) defined in a 3GPP TS document.

[0267] In one embodiment, turning off the main radio may include resetting the MAC of the main radio. For example, this may include stopping an ongoing random access procedure, flushing the Msg3 buffer, or canceling a triggered SR / BSR / PHR / BFR procedure. Alternatively, existing RRC settings may be maintained.

[0268] In one embodiment, turning off the main radio may include disabling or releasing all RRC settings that were set for standalone operation of the main radio, and enabling or keeping enabled all RRC settings for operation of the main radio via the wake-up receiver.

[0269] In one embodiment, the main radio being turned off may include a timer being triggered by the main radio being turned off and the wake-up receiver being turned on. The timer may be used to prevent the main radio from remaining off for a long period of time when the wake-up receiver has not received a wake-up signal.

[0270] In one embodiment, turning off the main radio may include flushing all HARQ soft buffers of the serving cells.

[0271] In one embodiment, the main radio being turned off may include resetting, stopping, or restarting all relevant timers of the terminal in the RRC connected or RRC idle / inactive state. For example, the T304 timer that operates upon reception of an RRC reconfiguration, the T300 timer for an RRC setup request, the T301 timer for an RRC reestablishment request, and the T302 timer for an RRC rejection may be reset, stopped, or restarted.

[0272] In one embodiment, the main radio being turned off may mean that the main radio is no longer monitoring or receiving downlink channels / signals as defined in the specification. Alternatively, transmission of uplink channels / signals may be maintained as defined in the specification or as set by the base station.

[0273] In one embodiment, turning off the main radio may include stopping PDCCH monitoring of the main radio as configured by the base station or defined in the specification.

[0274] In one embodiment, the main radio being turned off may include stopping the serving cell measurements performed by the main radio alone and activating RRC settings necessary for the main radio to measure the serving cell by the wake-up receiver or for the wake-up receiver to be involved in the operation of the main radio to measure the serving cell.

[0275] In one embodiment, turning off the main radio may involve performing a MAC reset of the main radio or wake-up receiver. Examples of this may include initializing HARQ, applying new values ​​to timers for the interaction between the wake-up receiver and the main radio, or immediately applying higher-level signal settings.

[0276] According to one embodiment of the present disclosure, when the main radio of the terminal is on, the terminal can receive a downlink signal (or data) from a base station through the main radio. According to various embodiments of the present disclosure, the main radio being 'on' may be expressed as the main radio being 'turned on' or the main radio being 'activated', and may have a similar or substantially equivalent meaning thereto. According to one embodiment, the activation of the main radio may mean that specific components of the terminal or the main radio (e.g., radio frequency (RF) or baseband (BB), etc.) are turned on or activated, or may be defined by a standard (e.g., 3GPP TS document). However, according to various embodiments of the present disclosure, without being limited to the above, the activation of the main radio may include performing an operation by a parameter or parameter having equivalent or substantially similar content thereto. For example, activation of the main radio may include the terminal or main radio performing a reception operation of a specific channel or signal (e.g., an SS / PBCH block containing a synchronization signal or a PDCCH containing a downlink control channel) as defined in a 3GPP TS document.

[0277] In one embodiment, turning on the main radio may include resetting the MAC of the main radio. For example, this may include stopping an ongoing random access procedure, flushing the Msg3 buffer, or canceling a triggered SR / BSR / PHR / BFR procedure. Alternatively, existing RRC settings may be maintained.

[0278] In one embodiment, turning on the main radio may include disabling or releasing all RRC settings for operation of the main radio via the wake-up receiver, and enabling or keeping enabled all RRC settings configured for standalone operation of the main radio.

[0279] In one embodiment, the main radio turning on may include the operation of a timer triggered by the main radio turning on. The timer may be used to prevent the main radio from being kept on for a long period of time without receiving PDCCHs, thereby wasting power.

[0280] In one embodiment, turning on the main radio may include flushing all HARQ soft buffers of the serving cells.

[0281] In one embodiment, turning on the main radio may include resetting, stopping, or restarting all relevant timers of the terminal in the RRC connected or RRC idle / inactive state. For example, the T304 timer that operates upon reception of an RRC reconfiguration, the T300 timer for an RRC setup request, the T301 timer for an RRC reestablishment request, and the T302 timer for an RRC rejection may be reset, stopped, or restarted.

[0282] In one embodiment, the main radio turning on may include the initiation of monitoring or receiving of downlink channels / signals as defined in the specification for the main radio to perform. Alternatively, transmission of uplink channels / signals may be maintained as defined in the specification or as set by the base station.

[0283] In one embodiment, turning on the main radio may include initiating PDCCH monitoring of the main radio as configured by the base station or defined in the specification.

[0284] In one embodiment, turning on the main radio may include deactivating RRC settings required for the main radio to measure the serving cell by the wake-up receiver or for the wake-up receiver to engage in the operation of the main radio to measure the serving cell, and initiating the serving cell measurement performed by the main radio alone.

[0285] In one embodiment, turning on the main radio may include performing a MAC reset of the main radio. Examples of this may include initializing HARQ, setting timers for standalone operation of the main radio to values ​​defined in the specification, or immediately applying higher-level signal settings.

[0286] In one embodiment, turning on the main radio may include stopping a timer for mutual operation of the main radio and the wake-up receiver or a timer for operation of the wake-up receiver, and starting a timer for standalone operation of the main radio.

[0287] As explained above, in order to save power consumption, the main radio can be 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.

[0288] Hereinafter, a procedure for waking up the main radio when it is in a sleep state is described according to various embodiments of the present disclosure. In one embodiment, the operation of waking up the main radio may be performed in conjunction with various operations according to various embodiments of the present disclosure, or may be performed separately, and may not be an essential component.

[0289] According to various embodiments of the present disclosure, when a base station has a channel or signal to transmit to a terminal, the base station may transmit a wake-up signal to the terminal. The terminal or the wake-up receiver may receive the wake-up signal and turn on the main radio. According to one embodiment, the act of receiving the wake-up signal itself may be an instruction to wake up the main radio. According to one embodiment, the wake-up signal may include K information bits, and information to wake up the main radio may be mapped to the K information bits. For example, if the information bit included in the wake-up signal is 1 bit of information, '1' may indicate ON, and '0' may indicate OFF.

[0290] In one embodiment, from a base station transmission perspective, the timing at which a wake-up signal is transmitted prior to transmission of a channel or signal may be pre-configured or pre-defined. From a terminal reception perspective, the timing at which a wake-up signal can be received prior to reception of a channel or signal may also be pre-configured or pre-defined.

[0291] In one embodiment, the terminal may transmit information regarding the time offset required between the wake-up signal and the transmission of the channel / signal to the base station via the terminal capability information reporting procedure, or via the random access preamble or uplink data channel in the random access procedure. Of course, the terminal is not limited thereto, and the terminal may transmit information regarding the time offset to the base station via an upper layer signal or via various other signals.

[0292] According to one embodiment, the terminal may transmit to the base station information regarding a time offset required between the wake-up signal and the transmission of the channel / signal, and the base station may set the time offset between the wake-up signal and the transmission of the channel / signal to the terminal based on the received information. Alternatively, the base station may set the information regarding the time offset between the wake-up signal and the transmission of the channel / signal to the terminal through a downlink data channel of a random access response (e.g., message 2) or a random access contention resolution (e.g., message 4) in a random access procedure. Of course, the present invention is not limited thereto, and the base station may set the information regarding the time offset to the terminal through an upper layer signal or through various signals.

[0293] According to various embodiments of the present disclosure, when a base station has a periodic channel or periodic signal to transmit to a terminal, instead of the base station transmitting a wake-up signal every time there is a channel or signal to transmit, the terminal or wake-up receiver can turn on the main radio according to a period based on setting information of the periodic channel or periodic signal set by the base station.

[0294] In one embodiment, the base station may transmit a wake-up signal only during the first transmission of a periodic channel or periodic signal, and may omit transmission of the wake-up signal during subsequent repeated transmissions of the channel or signal. In this case, the terminal or wake-up receiver may turn on the main radio based on the period according to the configuration information of the periodic channel or periodic signal set by the base station.

[0295] According to one embodiment, the type of periodic channel or periodic signal transmitted and received between the base station and the terminal may be preset or predefined. According to one embodiment, the type of periodic channel or periodic signal may be configured by the base station. The base station may configure the type of periodic channel or periodic signal to the terminal through a downlink data channel of a random access response (e.g., message 2) or a random access contention resolution (e.g., message 4), or may configure the type of periodic channel or periodic signal to the terminal through a higher-level signal indicating configuration information for receiving a wake-up signal or another higher-level signal.

[0296] According to various embodiments of the present disclosure, when a terminal has a channel or signal to transmit to a base station (e.g., a Physical Random Access Channel (PRACH) or a Scheduling Request (SR) or a Buffer Status Report (BSR)), or when the terminal performs L1 / L3-based measurement, the terminal or wake-up receiver can turn on the main radio regardless of the wake-up signal transmitted by the base station.

[0297] In one embodiment, a wake-up receiver may receive a wake-up signal for uplink transmission or L1 / L3 based measurement transmitted by a terminal to a base station and may not apply the operation of turning on and off the main radio of the terminal.

[0298] According to one embodiment, the type of uplink channel or uplink signal or L1 / L3-based measurement of the terminal transmitted regardless of the reception operation of the wake-up signal may be preset or predefined. According to one embodiment, the type of uplink channel or uplink signal or L1 / L3-based measurement may be configured by the base station. The base station may configure the type of uplink channel or uplink signal or L1 / L3-based measurement to the terminal through a random access response (e.g., message 2) or a random access contention resolution (e.g., message 4) downlink data channel, or may configure the terminal through a higher-order signal indicating configuration information for reception of the wake-up signal or another higher-order signal.

[0299] Hereinafter, according to various embodiments of the present disclosure, an operation for turning off the main radio when the main radio is in the on state is described. According to one embodiment, the operation for waking up the main radio when the main radio is in the on state may be performed in conjunction with various operations according to various embodiments of the present disclosure, or may be performed separately, and may not be an essential component.

[0300] According to various embodiments of the present disclosure, a base station may transmit a sleep signal to a terminal when there is no channel or signal to be transmitted to the terminal. The terminal or the wake-up receiver may receive the sleep signal and turn off the main radio. According to one embodiment, the act of receiving the sleep signal itself may be an instruction to wake up the main radio. According to one embodiment, the sleep signal may be configured as a separate sequence from the wake-up signal. According to one embodiment, the sleep signal may include information in which information to wake up the main radio is mapped to K information bits included in the wake-up signal. For example, in the case of 1 bit of information, '0' may indicate OFF and '1' may indicate ON.

[0301] According to various embodiments of the present disclosure, the main radio of a terminal may be turned off when a set condition is satisfied. In one embodiment, the set condition for the main radio may be when the main radio fails to detect or decode a downlink control channel, a specific channel, or a signal during a set period. In one embodiment, the base station may set configuration information (e.g., information including a period and a specific channel or signal) for the terminal to determine to turn off the main radio to the terminal through a higher-order signal indicating configuration information for receiving a wake-up signal or another higher-order signal.

[0302] According to various embodiments of the present disclosure, the main radio of a terminal may always be turned off after receiving a channel or signal. In one embodiment, after the wake-up receiver receives a wake-up signal from a base station, the main radio is turned on and receives a channel or signal, and then the main radio is turned off. In one embodiment, the time required for the main radio to turn off after the channel or reception is completed may be preset or predefined. In one embodiment, the terminal may transmit information regarding the time required for the main radio to turn off to the base station, and the base station may set the required time for the terminal based on the received information. In one embodiment, the information regarding the required time transmitted by the terminal may be transmitted to the base station through a terminal capability information reporting procedure. In one embodiment, the information regarding the required time transmitted by the terminal may be transmitted to the base station via a random access preamble or an uplink data channel. Of course, the present invention is not limited thereto, and the terminal may transmit the information regarding the required time to the base station via an upper layer signal. The base station can set the required time information to the terminal via the downlink data channel of the random access response (e.g., message 2) or random access contention resolution (e.g., message 4). Of course, this is not limited to this, and the base station can set the required time information to the terminal via an upper layer signal.

[0303] Hereinafter, according to various embodiments of the present disclosure, when a terminal or a main radio of the terminal is in an RRC_CONNECTED state, the terminal may be configured with C-DRX (connected mode DRX) so that the main radio may wake up every DRX cycle to perform PDCCH reception. According to one embodiment, when the terminal or the main radio of the terminal is in an RRC_CONNECTED state, the terminal (or the main radio) may be configured to receive a signal indicating whether the terminal should receive a PDCCH in the next DRX cycle.

[0304] In one embodiment, when the main radio is in RRC_IDLE / RRC_INACTIVE state, the terminal may be configured with I-DRX (idle mode DRX) so that the main radio wakes up every paging cycle to receive a paging PDCCH. In one embodiment, when the terminal or the main radio of the terminal is in RRC_CONNECTED state, the terminal (or the main radio) may be configured to receive a signal indicating whether the terminal should receive a paging PDCCH in the next paging cycle.

[0305] Hereinafter, according to various embodiments of the present disclosure, an embodiment is provided for a procedure of a terminal operating based on a wake-up receiver when an operation in which ON / OFF is indicated based on reception of a wake-up signal of a wake-up receiver and a main radio and an operation according to a setting of C-DRX or I-DRX are mixed. According to one embodiment, an operation of a terminal or a main radio of the terminal related to an RRC CONNECTED / IDLE / INACTIVE state may be performed in combination with various operations according to various embodiments of the present disclosure, or may be performed separately, and may not be an essential component.

[0306] According to various embodiments of the present disclosure, when a terminal having a wake-up receiver receives a wake-up signal and performs an operation of turning on and off a main radio of the terminal, the terminal may not perform an operation according to the settings and configuration of C-DRX or I-DRX. In this case, instead of performing an operation according to the settings and configuration of C-DRX or I-DRX, the terminal may turn on the main radio of the terminal only when it receives a wake-up signal to wake up the main radio, and may receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) defined or configured to be received in C-DRX or I-DRX, respectively.

[0307] In one embodiment, when a terminal or a main radio of the terminal is in an RRC_CONNECTED state and an operation performed by a wake-up receiver is configured or activated by a base station, the terminal may turn on the main radio when the wake-up receiver receives a wake-up signal to wake up the main radio, and may also perform an operation related to C-DRX configured by the base station (e.g., the main radio receiving a PDCCH within drx_onDurationTimer for each DRX cycle). In one embodiment, the terminal (or the main radio) may not perform an operation configured to receive a signal (e.g., DCI format 2_6) indicating to the terminal whether to receive a PDCCH in the next DRX cycle. In one embodiment, when a terminal or a main radio of the terminal is in an RRC_IDLE / INACTIVE state and an operation performed by a wake-up receiver is configured or activated by a base station, the terminal may turn on the main radio when the wake-up receiver receives a wake-up signal to wake up the main radio, and may also perform an operation related to I-DRX configured by the base station (e.g., the main radio wakes up every paging cycle to receive a paging PDCCH). In one embodiment, the terminal (or the main radio) may not perform an operation configured to receive a signal (e.g., DCI format 2_7) indicating to the terminal whether to receive a paging PDCCH in the next paging cycle.

[0308] According to one embodiment, instead of performing operations according to settings related to C-DRX or I-DRX, the terminal may perform operations for waking up the main radio according to a wake-up receiver and a wake-up signal according to various embodiments of the present disclosure and operations for turning off the main radio. If the operations performed by the wake-up receiver are deactivated by the base station, the operations related to C-DRX or I-DRX set by the base station may be performed again.

[0309] According to various embodiments of the present disclosure, when an operation performed by a wake-up receiver of a terminal is set or activated by a base station, and the terminal or the wake-up receiver receives a wake-up signal and the main radio is turned on, the terminal may transition to an RRC_CONNECTED state or transition to an RRC_IDLE or RRC_INACTIVE state. According to one embodiment, whether the terminal may transition to a state may be predetermined or may be determined by a higher-order signal or a separate higher-order signal for configuring the operation of the wake-up receiver from the base station.

[0310] In one embodiment, as an example of a case where information regarding a transition of the terminal is predetermined, the state of the main radio may follow the state of the main radio most recently turned on and then turned off immediately before the current on time. In another embodiment, as an example of a case where information regarding a transition of the terminal is predetermined, the state of the main radio may not be affected by whether the wake-up receiver operation is set and activated. For example, the state of the main radio of the terminal may be determined only by a higher-order signal indicating at least one of RRC_CONNECTED, RRC_IDLE, or RRC_INACTIVE, and the terminal may determine that the state of the main radio does not change depending on whether the wake-up receiver operation is set and activated.

[0311] According to one embodiment, the wake-up signal may include K information bits, and information regarding at least one of whether the main radio will go to the RRC_CONNECTED state, the RRC_IDLE state, or the RRC_INACTIVE state may be mapped to the K information bits.

[0312] According to one embodiment, when the terminal or the main radio of the terminal is RRC_CONNECTED based on the determined state of the terminal, the main radio may wake up and receive a PDCCH at each DRX cycle by C-DRX configured from the base station, or the terminal (or the main radio) may be configured from the base station to receive a signal indicating to the terminal whether to receive a PDCCH in the next DRX cycle. According to one embodiment, when an operation for turning off the main radio according to various embodiments is performed while the terminal is receiving a PDCCH (e.g., during a period in which the PDCCH is received), the terminal may perform a procedure for turning off the main radio as a priority.

[0313] According to one embodiment, when a terminal or a main radio of the terminal is in RRC_IDLE / INACTIVE, the main radio may wake up at each paging cycle by I-DRX configured from a base station to receive a paging PDCCH. The terminal (or the main radio) may also be configured by the base station to receive a signal indicating to the terminal whether to receive a paging PDCCH in the next paging cycle. When an operation for turning off the main radio according to various embodiments is performed while the terminal is receiving a paging PDCCH (e.g., during a period in which the paging PDCCH is received), the terminal may perform a procedure for turning off the main radio as a priority.

[0314] According to various embodiments of the present disclosure, the operations of the various terminals (or main radios) described above may be performed regardless of the order, and it goes without saying that the subject of the operations may be a terminal or a main radio.

[0315] FIG. 7 illustrates an operation flow of a terminal equipped with a wake-up receiver according to one embodiment of the present disclosure.

[0316] Referring to FIG. 7, at step 710, the terminal may receive a wakeup activation signal or a wakeup deactivation signal from the base station. According to one embodiment of the present disclosure, the terminal may receive a wakeup activation signal from the base station to enable the terminal to receive a wakeup signal using the wakeup receiver, or may receive a wakeup deactivation signal from the base station to enable the terminal to no longer receive a wakeup signal using the wakeup receiver.

[0317] Additionally, the terminal may receive information necessary for receiving a wake-up signal from the base station. In one embodiment, the terminal may receive information from the base station, including at least one of the following: whether a wake-up receiver is in use or configuration information for receiving a wake-up signal. Furthermore, the terminal may also receive information necessary for monitoring or receiving a downlink channel from the base station.

[0318] At step 720, the terminal may turn on or off the main radio based on the received wake-up activation signal or wake-up deactivation signal. According to one embodiment of the present disclosure, when the terminal receives a wake-up signal or deactivates reception of the wake-up signal according to an embodiment of the present disclosure, the terminal may turn on or off the main radio of the terminal and receive or stop a downlink channel or signal according to embodiments of the present disclosure.

[0319] FIG. 8 illustrates an operational flow for a base station according to various embodiments of the present disclosure.

[0320] Referring to FIG. 8, at step 810, the base station may transmit a wakeup activation signal to the terminal so that the terminal can receive a wakeup signal using the wakeup receiver. Additionally, the base station may transmit a wakeup deactivation signal to the terminal so that the terminal no longer receives a wakeup signal using the wakeup receiver.

[0321] Additionally, the base station may transmit to the terminal information necessary for receiving a wake-up signal. In one embodiment, the base station may transmit to the terminal information including at least one of the following: whether a wake-up receiver is used or configuration information for receiving a wake-up signal. Furthermore, the base station may also transmit to the terminal information necessary for monitoring and receiving a downlink channel.

[0322] At step 820, the base station may transmit a downlink channel or signal to the terminal. According to one embodiment of the present disclosure, the terminal may turn on or off the main radio and receive or stop receiving the downlink channel or signal based on a wakeup activation signal or wakeup deactivation signal received from the base station.

[0323] FIG. 9 illustrates the structure of a terminal according to one embodiment of the present disclosure.

[0324] As illustrated in FIG. 9, the terminal of the present disclosure may include a processor (930), a transceiver (910), and a memory (920). However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the processor (930), the transceiver (910), and the memory (920) may be implemented in the form of a single chip. According to one embodiment, the transceiver (910) of FIG. 9 may include the main radio (504) and the wake-up receiver (502) of FIG. 5.

[0325] According to one embodiment, the processor (930) may control a series of processes that enable the terminal to operate according to the embodiments of the present disclosure described above. For example, according to the embodiments of the present disclosure, the processor may control components of the terminal to activate / deactivate the wake-up receiver or turn the main radio ON / OFF. There may be one or more processors (930), and the processors (930) may perform signal transmission / reception operations of the terminal in the multiple DRX settings of the present disclosure described above by executing a program stored in the memory (920).

[0326] The processor (930) can control the overall operation of the terminal according to the embodiments proposed in the present disclosure by executing one or more commands stored in the memory (920).

[0327] The processor (930) may include various processing circuits and / or multiple processors. For example, the term “processor” as used herein, including in the claims, may include various processing circuits, including at least one processor. One or more processors in at least one processor may be configured to perform various functions described herein, individually and / or collectively, in a distributed fashion. As used herein, “processor,” “at least one processor,” and “one or more processors” may be configured to perform various functions. However, these terms encompass, without limitation, situations where one processor performs some of the functions and other processor(s) perform other parts of the functions, and situations where a single processor may perform all of the functions. Furthermore, the at least one processor may include a combination of processors that perform various functions of the disclosed functions in a distributed manner. At least one processor may execute program instructions to achieve or perform various functions.

[0328] In one embodiment, at least one processor (930) may be a general-purpose processor such as a CPU, AP, or DSP (Digital Signal Processor), a graphics-only processor such as a GPU or VPU (Vision Processing Unit), or an AI-only processor such as an NPU. For example, if one or more processors are AI-only processors, the AI-only processors may be designed with a hardware structure specialized for processing a specific AI model.

[0329] The transceiver (910) can transmit and receive signals with the base station. The signals transmitted and received with the base station can include control information and data. The transceiver (910) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, an RF receiver that low-noise amplifies the received signal and down-converts the frequency, etc. However, the transceiver (910) is only one embodiment, and the components of the transceiver (910) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (910) can receive a signal through a wireless channel and output it to the processor (930), and transmit a signal output from the processor (930) through the wireless channel.

[0330] According to one embodiment, the memory (920) can store programs and data necessary for the operation of the terminal. In addition, the memory (920) can store control information or data included in signals transmitted and received by the terminal. The memory (920) can be configured as a storage medium or a combination of storage media such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, there can be a plurality of memories (920). According to one embodiment, the memory (920) can store a program for performing signal transmission and reception operations of the terminal when setting up multiple DRXs as in the embodiments of the present disclosure described above.

[0331] A program for performing transmission and reception operations of a terminal can be stored depending on whether the base station mode is the base station energy saving mode or the base station normal mode.

[0332] FIG. 10 illustrates the structure of a base station according to one embodiment of the present disclosure.

[0333] As illustrated in FIG. 10, the base station of the present disclosure may include a processor (1030), a transceiver (1010), and a memory (1020). 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 than the components described above. Furthermore, the processor (1030), the transceiver (1010), and the memory (1020) may be implemented in the form of a single chip.

[0334] The processor (1030) may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, according to the embodiment of the present disclosure, the processor may control the terminal to activate / deactivate the wake-up receiver, or transmit a wake-up signal to the terminal to turn the main radio of the terminal on / off. There may be one or more processors (1030), and the processors (1030) may execute a program stored in the memory (1020) to perform signal transmission / reception operations of the terminal in the multiple DRX settings of the present disclosure described above.

[0335] The processor (1030) can control the overall operation of the terminal according to the embodiments proposed in the present disclosure by executing one or more commands stored in the memory (1020).

[0336] The processor (1030) may include various processing circuits and / or multiple processors. For example, the term “processor” as used herein, including in the claims, may include various processing circuits, including at least one processor. One or more processors in at least one processor may be configured to perform various functions described herein, individually and / or collectively, in a distributed fashion. As used herein, “processor,” “at least one processor,” and “one or more processors” may be configured to perform various functions. However, these terms encompass, without limitation, situations where one processor performs some of the functions and other processor(s) perform other parts of the functions, and situations where a single processor may perform all of the functions. Furthermore, the at least one processor may include a combination of processors that perform various functions of the disclosed functions in a distributed manner. The at least one processor may execute program instructions to achieve or perform various functions.

[0337] In one embodiment, at least one processor (1030) may be a general-purpose processor such as a CPU, AP, or DSP (Digital Signal Processor), a graphics-only processor such as a GPU or VPU (Vision Processing Unit), or an AI-only processor such as an NPU. For example, if one or more processors are AI-only processors, the AI-only processors may be designed with a hardware structure specialized for processing a specific AI model.

[0338] The transceiver (1010) can transmit and receive signals with the terminal. The signals transmitted and received with the terminal can include control information and data. The transceiver (1010) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, an RF receiver that low-noise amplifies the received signal and down-converts the frequency, etc. However, the transceiver (1010) is only one embodiment, and the components of the transceiver (1010) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (1010) can receive a signal through a wireless channel and output it to the processor (1030), and transmit a signal output from the processor (1030) through the wireless channel.

[0339] According to one embodiment, the memory (1020) may store programs and data necessary for the operation of the base station. In addition, the memory (1020) may store control information or data included in signals transmitted and received by the base station. The memory (1020) may be configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, there may be a plurality of memories (1020).

[0340] In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in the singular or plural form, 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 the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0341] 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 following claims, but also by equivalents thereof.

[0342] 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 of UE (User Equipment) in a wireless communication system, A step of receiving a wake-up signal (WUS) from a base station through a wake-up receiver (WUR), the wake-up signal including information indicating activation (ON) or deactivation (OFF) of a main radio (MR); A step of activating or deactivating MR based on the above WUS; and A method comprising: a step of receiving downlink data through the MR when the MR is activated; 2. In the first paragraph, the step of deactivating the MR comprises: Step to reset the MAC (Medium Access Control) layer of MR; A step of releasing the RRC (Radio Resource Control) settings for standalone operation of MR and maintaining the RRC settings for MR operation via WUR; Step of starting a timer based on the deactivation of MR and a timer based on the activation of WUR; A step of flushing the HARQ (Hybrid Automatic Repeat request) soft buffer of serving cells; A step of resetting, stopping or restarting the relevant timers of a UE in RRC connected or RRC idle / inactive state; A step of stopping monitoring or receiving a downlink signal; A step of monitoring or maintaining transmission of an uplink signal; Step of stopping monitoring of MR's PDCCH (Physical Downlink Control CHannel); A step of stopping serving cell measurement by MR and performing serving cell measurement by WUR; or A method comprising at least one of the steps of performing a MAC reset of MR or WUR; 3. In the first paragraph, the step of activating the MR comprises: Step of resetting the MAC layer of MR; A step of maintaining RRC settings for standalone operation of MR and releasing RRC settings for MR operation via WUR; Step of starting a timer based on the activation of MR; Step of flushing the HARQ soft buffers of serving cells; A step of resetting, stopping or restarting the relevant timers of a UE in RRC connected or RRC idle / inactive state; A step of resuming monitoring or receiving a downlink signal; A step of monitoring or maintaining transmission of an uplink signal; Step of resuming PDCCH monitoring of MR; A step of performing serving cell measurement by MR and stopping serving cell measurement by WUR; Steps to perform MAC reset of MR; or A method comprising at least one of: stopping a timer for the operation of WUR; 4. In paragraph 1, A method further comprising the steps of receiving, from the base station, information about a time period during which WUS can be monitored; information about a monitoring occasion during which WUS can be detected within the time period; and information about a cycle during which the time period is repeated.

5. In paragraph 4, Upon receiving information indicating activation of WUR from the base station, a step of deactivating the MR; and A method further comprising: a step of monitoring WUS during the time interval, at the monitoring occasion, through the WUR; 6. A method according to claim 4, characterized in that a plurality of monitoring occasions included within a time interval in which WUS can be monitored are each associated with different beams.

7. A method according to claim 4, characterized in that a plurality of monitoring occasions included within a time period in which WUS can be monitored are each associated with different UE groups.

8. In paragraph 1, A method further comprising: reporting capability information indicating to the base station that the UE can activate MR using WUR; 9. In paragraph 8, A method in which the above capability information is reported to the base station via a UE Capability Information message, via a random access preamble (Message 1) during a random access procedure, or via an uplink data channel (Message 3) during a random access procedure.

10. In a method of a base station in a wireless communication system, A step of transmitting a wake-up signal (WUS) to a UE (user equipment), the Wake-Up Signal (WUS) including information indicating activation (ON) or deactivation (OFF) of a main radio (MR) of the UE; and A method in which the MR of the UE is activated or deactivated based on the WUS.

11. In a wireless communication system, in UE (User Equipment), A memory in which a program or at least one instruction is stored; and wherein the UE comprises at least one processor, and the at least one processor executes, alone or in cooperation, the program stored in the memory or the at least one instruction, Receive a wake-up signal (WUS) from a base station, through a wake-up receiver (WUR), which includes information indicating activation (ON) or deactivation (OFF) of the main radio (MR), Activate or deactivate MR based on the above WUS, and A UE that receives downlink data through the MR when the MR is activated.

12. In the 11th paragraph, the UE further executes the program or the at least one instruction stored in the memory, either alone or in cooperation with the at least one processor, When disabling the above MR, Reset the MAC (Medium Access Control) layer of the MR; Disable RRC (Radio Resource Control) settings for standalone operation of MR, and maintain RRC settings for MR operation via WUR; Start a timer based on the deactivation of MR and a timer based on the activation of WUR; Flush the HARQ (Hybrid Automatic Repeat request) soft buffers of serving cells; Reset, stop or restart the relevant timers of a UE in RRC connected or RRC idle / inactive state; Stop monitoring or receiving downlink signals; Maintain monitoring or transmission of uplink signals; Stop monitoring the MR's PDCCH (Physical Downlink Control CHannel); Stop serving cell measurement by MR and perform serving cell measurement by WUR; or A UE that performs at least one of: performing a MAC reset of MR or WUR; 13. In the 11th paragraph, the UE further executes the program or the at least one instruction stored in the memory, either alone or in cooperation with the at least one processor, When activating the above MR, Reset the MAC layer of MR; Maintain RRC settings for standalone operation of MR, and release RRC settings for MR operation via WUR; Start a timer based on the activation of MR; Flush the HARQ soft buffers of the serving cells; Reset, stop or restart the relevant timers of a UE in RRC connected or RRC idle / inactive state; Resume monitoring or reception of downlink signals; Maintain monitoring or transmission of uplink signals; Resume PDCCH monitoring of MR; Perform serving cell measurement by MR and stop serving cell measurement by WUR; Perform a MAC reset of the MR; or A UE that performs at least one of the following: stopping a timer for the operation of WUR; 14. In the 11th paragraph, the UE further executes the program or the at least one instruction stored in the memory, either alone or in cooperation with the at least one processor, A UE receiving, from the base station, information about a time period during which WUS can be monitored; information about a monitoring occasion during which WUS can be detected within the time period; and information about a cycle during which the time period is repeated.

15. In a base station in a wireless communication system, A memory in which a program or at least one instruction is stored; and The base station comprises at least one processor, and the at least one processor executes the program or the at least one instruction stored in the memory, either alone or in cooperation. Transmitting a wake-up signal (WUS) to a UE (user equipment), which includes information indicating activation (ON) or deactivation (OFF) of the main radio (MR) of the UE, and A base station in which the MR of the UE is activated or deactivated based on the above WUS.

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