Method and apparatus for transmitting and receiving signal in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method for operation of a UE, according to an embodiment of the present disclosure, comprises the steps of: transmitting, to a base station, a wake-up signal (WUS) requesting transmission of an on-demand synchronization signal block (SSB); receiving a short message from the base station, the short message including information indicating that system information has been changed on the basis of the WUS from the UE, for requesting the transmission of the on-demand SSB; and receiving the changed system information from the base station.

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] The present disclosure relates to operations of a terminal and a base station in a wireless communication system, and more particularly, to a method and device for requesting on-demand SSB transmission in a next-generation energy-saving wireless communication system.

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

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

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

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

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

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

[0008] The present disclosure provides a method and device for transmitting a wake-up signal of a terminal for transmitting a synchronization signal block (SSB) of a base station operating in a power saving mode in a wireless communication system.

[0009] According to one embodiment of the present disclosure, in a wireless communication system, the network can further reduce power consumption of the network by waking up from sleep mode and transmitting SSB signals only when necessary.

[0010] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0011] 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 a step of transmitting a wake-up signal (WUS) requesting on-demand SSB (Synchronization signal block) transmission to a base station. The method of the UE may include a step of receiving a Short Message from the base station, wherein the Short Message may include information indicating that system information has changed based on the WUS requesting on-demand SSB transmission of the UE. The method of the UE may include a step of receiving the changed system information from the base station.

[0012] In one embodiment, the Short Message may be received via Radio Resource Control (RRC) signaling, Medium Access Control Element (MAC CE), or Downlink Control Information (DCI).

[0013] According to one embodiment, the step of transmitting a WUS requesting on-demand SSB transmission may include: receiving, from a base station, WUS-related configuration information requesting on-demand SSB transmission; wherein the WUS-related configuration information includes information on a triggering condition for WUS transmission and information on resources for WUS transmission; determining whether a triggering condition for WUS transmission is satisfied; and, if the triggering condition for WUS transmission is satisfied, transmitting, to the base station, a WUS requesting on-demand SSB transmission based on the information on resources for WUS transmission.

[0014] According to one embodiment, the base station may be a base station to which at least one of a primary cell (PCell) or a secondary cell (SCell) belongs. Information about resources for WUS transmission may include at least one of information about resources of a PCell capable of transmitting a WUS requesting on-demand SSB transmission or information about resources of a SCell capable of transmitting a WUS requesting on-demand SSB transmission.

[0015] According to one embodiment, the WUS-related configuration information may further include at least one of: time resource-related information capable of transmitting WUS or frequency resource-related information capable of transmitting WUS; an ID of a triggering condition for WUS transmission or a list of triggering condition IDs; an ID of a sequence capable of transmitting WUS or a list of sequence IDs; an ID of information capable of transmitting WUS or a list of information IDs; information indicating that the UE can transmit WUS when the base station is operating in a deep sleep mode; an ID of a cell applicable to the WUS-related configuration information or a list of cell IDs; information indicating that the WUS-related configuration information is cell common information; information about a cell currently operating in a deep sleep mode; information about a cell in which a main radio (MR) is currently turned on; or information indicating to reuse a resource for a physical random access channel (PRACH) or a resource for a scheduling request (SR).

[0016] According to one embodiment, a triggering condition for WUS transmission may include at least one of: determining that a specific cell is out of synchronization; determining that an SSB transmission period of a specific cell is longer than a predetermined length; receiving a WUS transmission instruction from a Pcell to an SCell; determining that a measurement frequency of a specific cell is longer than a predetermined length; determining that measurement of a specific cell is necessary; or determining that a change in an SSB transmission pattern of a specific cell is necessary.

[0017] According to one embodiment, the WUS may include at least one of: a sequence to be transmitted to the WUS; an ID of the terminal or a portion of the ID of the terminal; or information indicating that the WUS is to request on-demand SSB transmission.

[0018] In one embodiment, the WUS may be a random access (RA) preamble. In this case, the WUS-related configuration information may include at least one of: information regarding an RA sequence number that can be used for an on-demand SSB transmission request; or information regarding a resource that can transmit an RA preamble for an on-demand SSB transmission request.

[0019] In one embodiment, the WUS may be a scheduling request (SR). In this case, the WUS-related configuration information may include at least one of: information about an SR that can be used for an on-demand SSB transmission request; or information about a resource that can transmit an SR for an on-demand SSB transmission request.

[0020] In one embodiment, the WUS may be a signal that can be transmitted using a wake-up radio (WUR). In this case, the WUS-related configuration information may include at least one of: information about a WUR that can be used for an on-demand SSB transmission request; information about a signal that can be used for an on-demand SSB transmission request; or information about a resource that can transmit the WUS using the WUR.

[0021] In one embodiment, WUS related configuration information may be received via RRC signaling, MAC CE, or DCI.

[0022] 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 receiving a wake-up signal (WUS) requesting on-demand SSB (Synchronization signal block) transmission from a user equipment (UE). The method of the base station may include transmitting a short message to the UE, wherein the short message may include information indicating that system information has changed based on the WUS requesting on-demand SSB transmission from the UE. The method of the base station may include transmitting the changed system information to the UE.

[0023] In a wireless communication system according to one embodiment, a user equipment (UE) is provided. The UE may include a memory storing one or more commands and at least one processor. The at least one processor may transmit a wake-up signal (WUS) requesting on-demand SSB (Synchronization signal block) transmission to a base station by executing one or more commands stored in the memory. The at least one processor may receive a Short Message from the base station by executing one or more commands stored in the memory. The Short Message may include information indicating that system information has changed based on the WUS requesting on-demand SSB transmission of the UE. The at least one processor may receive the changed system information from the base station by executing one or more commands stored in the memory.

[0024] According to one embodiment, in order to transmit a WUS requesting on-demand SSB transmission, at least one processor may execute one or more instructions stored in a memory to receive, from a base station, WUS-related configuration information requesting on-demand SSB transmission; the WUS-related configuration information includes information on a triggering condition for WUS transmission and information on resources for WUS transmission; determine whether the triggering condition for WUS transmission is satisfied; and, if the triggering condition for WUS transmission is satisfied, transmit, to the base station, the WUS requesting on-demand SSB transmission based on the information on resources for WUS transmission.

[0025] In a wireless communication system according to one embodiment, a base station is provided. The base station may include a memory storing one or more commands and at least one processor. The at least one processor may receive a wake-up signal (WUS) requesting on-demand SSB (Synchronization signal block) transmission from a user equipment (UE) by executing one or more commands stored in the memory. The at least one processor may transmit a short message to the UE by executing one or more commands stored in the memory. The short message may include information indicating that system information has changed based on the WUS requesting on-demand SSB transmission from the UE. The at least one processor may transmit the changed system information to the UE by executing one or more commands stored in the memory.

[0026] The technical problems to be achieved in various embodiments of the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0027] FIG. 1 is a diagram illustrating a next-generation mobile communication system structure that supports network energy saving according to an embodiment of the present disclosure.

[0028] FIG. 2 is a diagram illustrating a next-generation mobile communication system structure that supports network energy saving according to an embodiment of the present disclosure.

[0029] FIG. 3 is a diagram for explaining a method in which a terminal requests on-demand SSB transmission from a base station according to one embodiment of the present disclosure.

[0030] FIG. 4 is a diagram for explaining a method in which a terminal requests on-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0031] FIG. 5 is a diagram for explaining a method for a terminal to request On-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0032] FIG. 6 is a diagram for explaining a method for a terminal to request On-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0033] FIG. 7 is a diagram for explaining a method in which a base station provides SSB information of a changed cell to a terminal according to an embodiment of the present disclosure.

[0034] FIG. 8 is a diagram for explaining a method for a terminal to request On-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0035] FIG. 9 is a diagram for explaining the NES mode concept of a base station or cell according to one embodiment of the present disclosure.

[0036] FIG. 10 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0037] FIG. 11 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.

[0038] The operating principles of the present invention will be described in detail below with reference to the attached drawings. In the following description of the present invention, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0039] 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, and terms referring to various identification information are provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0040] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which the embodiments of the present disclosure may be applied, and 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure. It will be appreciated that each block of the processing flow diagrams and combinations of the flow diagrams can be executed by computer program instructions.

[0041] These computer program instructions may be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that the instructions executed by the processor of the computer or other programmable data processing apparatus create means for performing the functions described in the flowchart block(s). These computer program instructions may also be stored in a computer-available or computer-readable memory that can be directed to a computer or other programmable data processing apparatus to implement functions in a particular manner, so that the instructions stored in the computer-available or computer-readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flowchart block(s). The computer program instructions may also be installed on a computer or other programmable data processing apparatus, so that a series of operational steps are performed on the computer or other programmable data processing apparatus to create a computer-implemented process, so that the instructions executing on the computer or other programmable data processing apparatus can provide steps for performing the functions described in the flowchart block(s).

[0042] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function. In this case, the term '~unit' used in the present embodiment means software or a hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the '~unit' may perform certain roles. However, the '~unit' is not limited to software or hardware. The '~unit' may be configured to be on an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, the components and '~ units' may be implemented to reproduce one or more CPUs within a device or a secure multimedia card. Also, in an embodiment, the '~ unit' may include one or more processors.

[0043] For convenience of explanation, this disclosure uses terms and names defined in the 5GS and NR standards, which are standards defined by the 3rd Generation Partnership Project (3GPP). However, the present invention is not limited to these terms and names and can be equally applied to wireless communication networks that comply with other standards. For example, the present invention can be applied to the 3GPP 5GS / NR (5th generation mobile communication standard).

[0044] The present disclosure relates to operations of a terminal and a base station in a wireless communication system, and more particularly, to a signal transmission and reception method and device for setting a trigger condition for a terminal to transmit a wake-up signal (hereinafter, WUS) to request transmission of a synchronization signal block (hereinafter, SSB) of a base station or a secondary cell (hereinafter, SCell) in a Network Energy Saving (NES) system supporting power saving technology, and transmitting the WUS according to the trigger.

[0045] A method for a terminal according to an embodiment of the present disclosure to initiate a trigger for transmitting a wake-up signal (WUS) to adjacent cells and base stations according to a certain condition may include an operation of receiving a signal including information for setting a trigger condition for transmitting a wake-up signal from a first base station, an operation of determining the trigger condition, and an operation of transmitting the wake-up signal.

[0046] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description have been omitted to clearly explain the present invention, and similar parts have been designated with similar reference numerals throughout the specification.

[0047] FIG. 1 is a diagram illustrating a next-generation mobile communication system structure that supports network energy saving according to an embodiment of the present disclosure.

[0048] Referring to FIG. 1, a next-generation mobile communication system supporting network energy saving may be composed of a next-generation base station (1-01, g Node B, hereinafter referred to as gNB, Node B or base station), a cell (1-06, 1-07, 1-08), and a terminal (1-09, User Equipment (UE)). Here, the gNB may be composed of a CU (1-02, Central Unit) and one or more DUs (1-03, 1-04, Distributed Unit).

[0049] A CU can support one or more DUs, and a DU (1-03, 1-04) can support one cell (1-06, 1-07, 1-08), or one or more cells (1-06, 1-07, 1-08).

[0050] UE(1-09) can access an external network via gNB through cell.

[0051] Each cell (1-06, 1-07, 1-08) can maintain a connection to a specific UE, and at this time, one or more cells can maintain a connection to one UE and support data transmission and reception using the same resource or different resources.

[0052] At this time, a specific cell (1-06) operates as a primary cell (PCell) and may be a cell operating on a primary frequency, as it is a cell on which a terminal performs an initial connection setup procedure, initiates a connection re-establishment procedure, or is designated as a primary cell in a handover procedure.

[0053] For other cells (1-07, 1-08), they may operate as secondary cells (SCells) and may be used to provide additional radio resources, operate on a secondary frequency, and may be cells that can be configured after an RRC connection is established.

[0054] One PCell (1-06) and one SCell (1-07) may have their transceivers located in the same location, and another SCell (1-08) may have its transceivers located in a physically different location from the PCell (1-06).

[0055] Additionally, different cells may use different frequencies, different carriers, different times, and different numerologies (sub-carrier spacing, etc.).

[0056] FIG. 2 is a diagram illustrating a next-generation mobile communication system structure that supports network energy saving according to an embodiment of the present disclosure.

[0057] Referring to FIG. 2, a next-generation mobile communication system supporting network energy saving may be composed of next-generation base stations (2-1, 2-11, g Node B, hereinafter referred to as gNB, Node B or base station), cells (2-6, 2-7, 2-8), and terminals (2-9, User Equipment (UE)). Here, a gNB may be composed of a CU (2-2, 2-12, Central Unit) and one or more DUs (2-3, 2-4, 2-13, 2-14 Distributed Unit).

[0058] A CU can support one or more DUs, and a DU (2-3, 2-4, 2-13, 2-14) can support one cell (2-6, 2-7, 2-8), or one or more cells (2-6, 2-7, 2-8).

[0059] UE(2-9) can access an external network via gNB through cell.

[0060] Each of the cells (2-6, 2-7, 2-8) can maintain a connection to a specific UE, and at this time, one or more cells can maintain a connection to one UE and support data transmission and reception using the same resource or different resources.

[0061] At this time, a specific cell (2-6) operates as a primary cell (PCell) and may be a cell operating on a primary frequency, as it is a cell on which a terminal performs an initial connection setup procedure, initiates a connection re-establishment procedure, or is designated as a primary cell in a handover procedure.

[0062] For other cells (2-7, 2-8), they may operate as secondary cells (hereinafter referred to as SCells) and may be used to provide additional radio resources, operate on a secondary frequency, and may be cells that can be configured after an RRC connection is established.

[0063] One PCell (2-6) and one SCell (2-7) may have their transceivers located in the same location, and another SCell (2-8) may have its transceivers located in a physically different location from the PCell (2-6).

[0064] Additionally, different cells may be managed by different gNBs, and may use different frequencies, different carriers, different times, and different numerologies (sub-carrier spacing, etc.).

[0065] FIG. 3 is a diagram for explaining a method in which a terminal requests on-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0066] Referring to FIG. 3, a terminal (3-1) can request on-demand SSB transmission to a base station (3-2) for any cell, for example, any PCell or SCell.

[0067] In step 3-3, the base station (3-2) can transmit a signal to the terminal (3-1) that sets in advance a triggering condition for the terminal (3-1) to transmit an Uplink Wake-up signal (hereinafter referred to as UL WUS) and information about resources for the terminal (3-1) to transmit the UL WUS.

[0068] The signal transmitted to the terminal (3-1) in the above step 3-3 may be transmitted by being included in an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0069] In step 3-4, the terminal (3-1) that has been set with a triggering condition and a resource capable of transmitting a wake-up signal through the signal received in step 3-3 can measure and determine whether the triggering condition is satisfied through various wired and wireless channels and sensors.

[0070] In step 3-5, if the triggering condition is satisfied, the terminal (3-1) can transmit a wake-up signal to the base station (3-2) through the resource set based on the signal received in step 3-3.

[0071] In step 3-6, the base station (3-2) that received the wake-up signal may decide to start SSB transmission if SSB transmission was stopped, or may decide to change the SSB pattern, such as changing the cycle of SSB, and transmit the existing SSB or the SSB of the changed pattern to the terminal.

[0072] The SSB transmitted by the base station (3-2) at the request of the terminal (3-1) may include an indicator indicating that the SSB is an on-demand SSB at the request of the terminal, for example, 1 bit or the terminal ID or changed SSB pattern information.

[0073] FIG. 4 is a diagram for explaining a method in which a terminal requests on-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0074] Referring to FIG. 4, a terminal (4-1) can request on-demand SSB transmission to a base station 2 (4-3) for a certain cell, for example, a certain SCell (4-2) and / or a base station 1 (4-2) to which the SCell belongs. Base station 2 (4-3) may be a base station to which the PCell of the terminal (4-1) belongs.

[0075] The above base station 2 (4-3) and base station 1 (4-2) may be physically or logically different objects, and in one embodiment, may be a single base station that is physically and logically the same. The above-mentioned base station may be a single base station encompassing CU and DU, or may be a simplified base station having only some of the functions of CU, DU, etc.

[0076] In step 4-4, base station 2 (4-3) and base station 1 (4-2) can transmit and receive signals to each other in order to set information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (4-1) in advance, a triggering condition under which the terminal (4-1) can transmit the same, and resources of the PCell on which the terminal (4-1) can transmit the UL WUS. That is, base station 2 (4-3) and base station 1 (4-2) can share information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (4-1) in advance, a triggering condition under which the terminal (4-1) can transmit the same, and resources of the PCell on which the terminal (4-1) can transmit the UL WUS.

[0077] The above signal may be transmitted by being included in any inter-node signal, for example, an Xn interface signal or an Fn interface signal or an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0078] In step 4-5, base station 1 (4-2) can transmit a signal to terminal (4-1) that sets the Uplink Wake-up signal (hereinafter referred to as UL WUS) and the triggering conditions for terminal (4-1) to transmit the Uplink Wake-up signal and information about the resources of base station 2 (4-3) for which terminal (4-1) can transmit the UL WUS.

[0079] In step 4-6, the terminal (4-1) that has been set up with a resource capable of transmitting a triggering condition and a wake-up signal through the signal received in step 4-5 can measure and determine whether the triggering condition is satisfied through various wired and wireless channels and sensors.

[0080] In step 4-7, if the triggering condition is satisfied, the terminal (4-1) can transmit a wake-up signal to base station 2 (4-3) through the resource set based on the signal received in step 4-5.

[0081] In step 4-8, base station 2 (4-3) that has received the wake-up signal can inform base station 1 (4-2) that a wake-up signal requesting on-demand SSB transmission has been received from the terminal through intra node signaling or logical signaling if base station 1 (4-2) is within the same base station.

[0082] If base station 2 (4-3) that received the above wake-up signal is a physically and logically different base station from base station 1 (4-2), it can notify base station 1 (4-2) through inter node signaling that a wake-up signal requesting on-demand SSB transmission has been received from the terminal. The signal that base station 2 (4-3) transmits to base station 1 (4-2) through the inter node signaling can be referred to as an inter-node signal.

[0083] The above inter-node signal may include some or all of the following information:

[0084] - Base station ID of the transmitter / receiver of the inter-node signal

[0085] - Inter-node signal transmitter / receiver cell ID

[0086] - An indicator indicating that the wake-up signal requests on-demand SSB transmission.

[0087] - ID of the terminal that transmitted the wake-up signal

[0088] - Information in bit map format or direct numerical information that can identify the characteristics of the SSB requested by the terminal through the wake-up signal, such as SSB cycle, frequency, bandwidth, etc.

[0089] In step 4-9, base station 1 (4-2) that has received the inter-node signal may decide to start SSB transmission if SSB transmission has been stopped, or may decide to change the SSB pattern, such as changing the cycle of SSB, and transmit the existing SSB or the SSB of the changed pattern to the terminal (4-1).

[0090] The SSB transmitted by the above base station 1 (4-2) at the request of the terminal (4-1) may include an indicator indicating that the SSB is an on-demand SSB at the request of the terminal, for example, 1 bit or the terminal ID or changed SSB pattern information.

[0091] FIG. 5 is a diagram for explaining a method for a terminal to request On-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0092] Referring to FIG. 5, a terminal (5-1) can request on-demand SSB transmission to a cell, for example, a SCell (5-2) and / or a base station (5-2) to which the SCell belongs, from a base station (5-3). The base station (5-3) may be a base station to which the PCell of the terminal (5-1) belongs.

[0093] The above base station 2 (5-3) and base station 1 (5-2) may be physically or logically different objects, and in one embodiment, may be a single base station that is physically and logically the same. The above-mentioned base station may be a single base station encompassing CU and DU, or may be a simplified base station having only some of the functions of CU, DU, etc.

[0094] In step 5-4, base station 2 (5-3) and base station 1 (5-2) can transmit and receive signals to each other in order to set information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (5-1) in advance, a triggering condition under which the terminal (5-1) can transmit the same, and resources of the PCell on which the terminal (5-1) can transmit the UL WUS. That is, base station 2 (5-3) and base station 1 (5-2) can share information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (5-1) in advance, a triggering condition under which the terminal (5-1) can transmit the same, and resources of the PCell on which the terminal (5-1) can transmit the UL WUS.

[0095] The above signal may be transmitted by being included in any inter-node signal, for example, an Xn interface signal or an Fn interface signal or an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0096] In step 5-5, base station 2 (5-3) can transmit to terminal (5-1) a signal that sets the Uplink Wake-up signal (hereinafter referred to as UL WUS) and the triggering conditions for the terminal (5-1) to transmit the Uplink Wake-up signal and information about the resources of base station 2 (5-3) for which the terminal (5-1) can transmit the UL WUS. The signal can be transmitted by being included in an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0097] In step 5-6, the terminal (5-1) that has been set up with a resource capable of transmitting a triggering condition and a wake-up signal through the signal received in step 5-5 can measure and determine whether the triggering condition is satisfied through various wired and wireless channels and sensors.

[0098] In step 5-7, if the triggering condition is satisfied, the terminal (5-1) can transmit a wake-up signal to base station 2 (5-3) through the resource set based on the signal received in step 5-5.

[0099] In step 5-8, base station 2 (5-3) that has received the wake-up signal can inform base station 1 (5-2) that a wake-up signal requesting on-demand SSB transmission has been received from the terminal through intra-node signaling or through logical signal transmission if base station 1 (5-2) is within the same base station.

[0100] Base station 2 (5-3), which has received the above wake-up signal, if it is a physically and logically different base station from base station 1 (5-2), can inform base station 1 (5-2) through inter node signaling that a wake-up signal requesting on-demand SSB transmission has been received from the terminal. The signal that base station 2 (5-3) transmits to base station 1 (5-2) through the inter node signaling can be referred to as an inter-node signal.

[0101] The above inter-node signal may include some or all of the following information:

[0102] - Base station ID of the transmitter / receiver of the inter-node signal

[0103] - Inter-node signal transmitter / receiver cell ID

[0104] - An indicator indicating that the wake-up signal requests on-demand SSB transmission.

[0105] - ID of the terminal that transmitted the wake-up signal

[0106] - Information in bit map format or direct numerical information that can identify the characteristics of the SSB requested by the terminal through the wake-up signal, such as SSB cycle, frequency, bandwidth, etc.

[0107] In step 5-9, base station 1 (5-2) that has received the inter-node signal may decide to start SSB transmission if SSB transmission has been stopped, or may decide to change the SSB pattern, such as changing the cycle of SSB, and transmit the existing SSB or the SSB of the changed pattern to the terminal (5-1).

[0108] The SSB transmitted by the above base station 1 (5-2) at the request of the terminal (5-1) may include an indicator, for example, 1 bit or the terminal ID or changed pattern information, indicating that the SSB is an on-demand SSB at the request of the terminal.

[0109] FIG. 6 is a diagram for explaining a method for a terminal to request On-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0110] Referring to FIG. 6, a terminal (6-1) can request on-demand SSB transmission of SCell from base station 1 (6-2). Base station 2 (6-3) may be a base station to which the PCell of terminal (6-1) belongs. Base station 1 (6-2) may be a base station to which the SCell belongs.

[0111] The above base station 2 (6-3) and base station 1 (6-2) may be physically or logically different objects, and in one embodiment, may be a single base station that is physically and logically the same. The above-mentioned base station may be a single base station encompassing CU and DU, or may be a simplified base station having only some of the functions of CU, DU, etc.

[0112] In step 6-4, base station 2 (6-3) and base station 1 (6-2) can transmit and receive signals to each other in order to set information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (6-1) in advance, a triggering condition under which the terminal (6-1) can transmit it, and resources of an SCell on which the terminal (6-1) can transmit the UL WUS. That is, base station 2 (6-3) and base station 1 (6-2) can share information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (6-1) in advance, a triggering condition under which the terminal (6-1) can transmit it, and resources of an SCell on which the terminal (6-1) can transmit the UL WUS.

[0113] The above signal may be transmitted by being included in any inter-node signal, for example, an Xn interface signal or an Fn interface signal or an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0114] In step 6-5, base station 1 (6-2) can transmit a signal to terminal (6-1) that sets the Uplink Wake-up signal (hereinafter referred to as UL WUS) and the triggering conditions for the terminal (6-1) to transmit the Uplink Wake-up signal and the information about the resources of base station 1 (6-2) for which the terminal (6-1) can transmit the UL WUS. The signal can be transmitted by being included in an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0115] In step 6-6, the terminal (6-1) that has been set up with a resource capable of transmitting a triggering condition and a wake-up signal through the signal received in step 6-5 can measure and determine whether the triggering condition is satisfied through various wired and wireless channels and sensors.

[0116] In step 6-7, if the triggering condition is satisfied, the terminal (6-1) can transmit a wake-up signal to base station 1 (6-2) through the resource set based on the signal received in step 6-5.

[0117] In step 6-8, base station 1 (6-2) that has received the wake-up signal may decide to start SSB transmission if SSB transmission has been stopped, or may decide to change the SSB pattern, such as changing the SSB cycle. Base station 1 (6-2) may transmit the existing SSB or the SSB of the changed pattern to the terminal (6-1).

[0118] In step 6-9, base station 1 (6-2) can inform base station 2 (6-3) via intra node signaling, if base station 2 (6-3) is within the same base station, or via logical signaling, that a wake-up signal requesting on-demand SSB transmission has been received from the terminal and that this has led to a decision to change the SSB or start transmission.

[0119] Base station 1 (6-2), if it is a physically and logically different base station from base station 2 (6-3), can notify base station 2 (6-3) through inter node signaling that a wake-up signal requesting on-demand SSB transmission has been received from a terminal and that this has led to a decision to change SSB or start transmission. The signal that base station 1 (6-2) transmits to base station 2 (6-3) through the inter node signaling can be referred to as an inter-node signal.

[0120] The above inter-node signal may include some or all of the following information:

[0121] - Base station ID of the transmitter / receiver of the inter-node signal

[0122] - Inter-node signal transmitter / receiver cell ID

[0123] - An indicator indicating that the wake-up signal requests on-demand SSB transmission.

[0124] - ID of the terminal that transmitted the wake-up signal

[0125] - Information in bit map format or direct numerical information that can identify the characteristics of the SSB requested by the terminal through the wake-up signal, such as SSB cycle, frequency, bandwidth, etc.

[0126] - Information in bit map format or direct numerical information that can identify the characteristics of the changed SSB, such as SSB cycle, frequency, bandwidth, etc.

[0127] The existing SSB or changed SSB transmitted by the above base station 1 (6-2) at the request of the terminal (6-1) may include an indicator indicating that the SSB is an on-demand SSB at the request of the terminal, for example, 1 bit or the terminal ID or pattern information of the SSB before / after the change.

[0128] FIG. 7 is a diagram for explaining a procedure in which a base station provides SSB information of a changed cell to a terminal according to an embodiment of the present disclosure.

[0129] Referring to FIG. 7, any terminal can request on-demand SSB transmission or SSB pattern modification by transmitting the UL WUS signal to the base station (7-2).

[0130] Afterwards, when the base station determines that the SSB transmission pattern is modified or transmission is newly started (step 7-3), the base station can recognize that the information has been changed (step 7-4), and the base station can provide the changed information to any terminal (7-1) within the radius of the base station.

[0131] In step 7-5, the base station (7-2) according to one embodiment can transmit a short message to the terminal (7-1). In step 7-6, the terminal (7-1) that receives the short message can receive changed system information (e.g., MIB (master information bit) or SIB (system information block)).

[0132] The above short message may be included in any RRC signal such as RRC Reconfiguration, MAC signal such as MAC-CE, or PHY signal such as downlink DCI based on paging RNTI that can be received by a specific terminal or an unspecified number of terminals.

[0133] In one embodiment, the short message transmitted by the base station (7-2) may include an indicator indicating that the corresponding system information update has been changed through an on-demand SSB request of the terminal.

[0134] In one embodiment, the short message transmitted by the base station (7-2) may include an indicator indicating that the corresponding system information update has been changed through the terminal's UL WUS transmission.

[0135] In step 7-7, the base station (7-2) according to one embodiment can recognize that the network settings have changed. In step 7-8, the base station (7-2) can transmit a downlink signal including the changed network settings to the terminal (7-1), and the terminal (7-1) can receive the changed network information from the base station (7-2).

[0136] The above downlink signal may be an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a downlink DCI signal based on paging RNTI that can be received by a specific terminal or an unspecified number of terminals.

[0137] In one embodiment, the downlink signal (e.g., a short message) transmitted by the base station may include an indicator indicating that the corresponding system information update has been changed through an on-demand SSB request from the terminal.

[0138] In one embodiment, the downlink signal (e.g., a short message) transmitted by the base station may include an indicator indicating that the corresponding system information update has been changed through the UL WUS transmission of the terminal.

[0139] FIG. 8 is a diagram for explaining a method for a terminal to request On-demand SSB transmission from a base station according to an embodiment of the present disclosure.

[0140] Referring to Fig. 8, a terminal (8-1) may receive UL WUS resources from a base station 2 (8-3) and request on-demand SSB transmission to a base station 1 (8-2) of an adjacent cell, for example, to a certain SCell (8-2) and / or a base station 1 (8-2) to which the SCell belongs. The base station 2 (8-3) may be a base station to which the PCell of the terminal (8-1) belongs.

[0141] The above base station 2 (8-3) and base station 1 (8-2) may be different entities that manage physically or logically different cells, and in one embodiment, may be a single base station that is physically and logically the same but manages different cells. The above-mentioned base station may be a single base station encompassing CU and DU, or may be a simplified base station having only some of the functions of CU, DU, etc.

[0142] In step 8-4, base station 2 (8-3) and base station 1 (8-2) can transmit and receive signals to each other in order to set information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (8-1) in advance, a triggering condition under which the terminal (8-1) can transmit it, and resources of an SCell on which the terminal (8-1) can transmit the UL WUS. That is, base station 2 (8-3) and base station 1 (8-2) can share information about an Uplink Wake-up signal (hereinafter referred to as UL WUS) that can be transmitted by the terminal (6-1) in advance, a triggering condition under which the terminal (6-1) can transmit it, and resources of an SCell on which the terminal (6-1) can transmit the UL WUS.

[0143] The above signal may be transmitted by being included in any inter-node signal, for example, an Xn interface signal or an Fn interface signal or an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0144] In step 8-5, base station 2 (8-3) may transmit a signal to terminal (8-1) to set a triggering condition for terminal (8-1) to transmit the Uplink Wake-up signal (hereinafter referred to as UL WUS) to base station 1 (8-2) and information about resources of base station 1 (8-2) capable of transmitting the UL WUS to terminal (8-1). The signal may be transmitted by being included in an RRC signal (such as RRC reconfiguration), a MAC signal (such as MAC-CE), or a PHY signal (such as DCI).

[0145] In step 8-6, the terminal (8-1) that has been set up with a resource capable of transmitting a triggering condition and a wake-up signal through the signal received in step 8-5 can measure and determine whether the triggering condition is satisfied through various wired and wireless channels and sensors.

[0146] In step 8-7, if the triggering condition is satisfied, the terminal can transmit a wake-up signal to base station 1 (8-2) through the resource set based on the signal received in step 8-5.

[0147] In step 8-8, base station 1 (8-2) that has received the wake-up signal may decide to start SSB transmission if SSB transmission has been stopped, or may decide to change the SSB pattern, such as changing the cycle of SSB, and transmit an existing SSB or an SSB of a changed pattern to the terminal (8-1).

[0148] The SSB transmitted by the above base station 1 (8-2) at the request of the terminal (8-1) may include an indicator, for example, 1 bit or the terminal ID or changed pattern information, indicating that the SSB is an on-demand SSB at the request of the terminal.

[0149] FIG. 9 is a diagram for explaining the NES mode concept of a base station or cell according to one embodiment of the present disclosure.

[0150] Referring to FIG. 9, if a base station supporting the Wake Up Radio (WUR) function is called a WUR BS (9-1) and a terminal supporting the Wake Up Radio (WUR) function is called a WUR UE (9-4), then the WUR BS (9-1) may have a Main Radio (9-2, MR) for performing wireless communication with the WUR UE (9-4) and a WUR (9-3) for performing a Wake Up operation, and the WUR UE (9-4) may have a Main Radio (9-5, MR) for performing wireless communication with the WUR BS (9-1) and a WUR (9-6) for performing a Wake Up operation. At this time, the MR (9-2) of the WUR BS (9-1) can perform wireless communication with the MR (9-5) of the WUR UE (9-4) or other UE, and the WUR (9-3) of the WUR BS (9-1) can perform wireless communication with the WUR (9-6) of the WUR UE (9-4).

[0151] In one embodiment, the WUR may be a single, but logically distinct module, rather than two physically different modules as part of the MR.

[0152] In one embodiment, the WUR may be part of the MR, both physically and logically.

[0153] In one embodiment, the WUR BS (9-1) and the WUR UE (9-4) may have the following operational configuration states.

[0154] 1. Full On state with both MR and WUR turned on

[0155] 2. MR On state where only MR is on and WUR is off

[0156] 3. Deep Sleep state where MR is off and only WUR is on

[0157] 4. Full Off state with both MR and WUR turned off

[0158] 5. Light Sleep state where MR is on but some signals such as SSB, SIB, etc. are not transmitted and power is saved.

[0159] In order for a terminal to successfully transmit WUS to adjacent cells, the serving cell (or the base station to which the cell belongs) must provide the terminal with information on the WUS-receiving resources of the adjacent cells.

[0160] The serving cell uses WUR to determine which of the multiple adjacent cells with overlapping coverage can receive WUS in which way (periodic, aperiodic, …) and through which resources (time, frequency), and shares this information with the cells.

[0161] The base station of the cell may transmit a signal containing all or part of the following WUS-related information to the terminal.

[0162] a. Any resource information such as time / frequency at which WUS can be transmitted,

[0163] - Resource information including subframe / raioframe / slot time information that has some rule that repeats periodically, for example.

[0164] - Resource information including, for example, WUS transmission time duration as absolute time, number of slots, number of frames, etc.

[0165] - Resource information including absolute time, number of slots, number of frames, timer, etc., to indicate a start time that can be transmitted after a certain period of time after receiving the signal.

[0166] - Resource information including the ID of the frequency band, for example, which frequency band it refers to;

[0167] - Resource information including, for example, the ID of a resource block indicating a starting frequency, the bandwidth indicating a frequency bandwidth, the number of unit resource block frequency bandwidths, etc.

[0168] - Resource information including, for example, the ID of the reference frequency to indicate the starting frequency from a certain reference frequency, the bandwidth indicating the difference between the reference frequency and the starting frequency, the number of unit resource block frequency bandwidths, etc.

[0169] b. A sequence ID or list of sequence IDs that can specify sequences that can be transmitted to WUS.

[0170] c. An ID of information or a list of information IDs indicating the type of information that can be transmitted to WUS.

[0171] d. A list of condition IDs or condition IDs indicating the type of condition that can transmit WUS.

[0172] e. An indication that the terminal can transmit WUS when the base station is operating in Deep Sleep mode.

[0173] f. The above information may be information about the base station transmitting the signal.

[0174] g. The above information may be information on a neighboring base station (or cell) of the base station transmitting the signal, in which case it may include a base station ID or cell ID or a base station ID list or cell ID list.

[0175] h. The above information may be applicable to one or more base stations or cells, and may include a list of base station IDs or cell IDs that can use the corresponding WUS transmission information.

[0176] i. The above information may be applied equally to all adjacent base stations or cells (cell common information), in which case it may include an indicator (e.g., 1 bit indication) that notifies the terminal of the relevant information.

[0177] j. The above information may have a structure and format similar to or identical to PRACH (Physical Random Access Channel) configuration information.

[0178] The WUS transmitted by the terminal may contain all or part of the following information:

[0179] a. Sequence transmitted to WUS

[0180] b. ID of the terminal that transmitted the WUS

[0181] c. Part of the ID of the terminal that transmitted the WUS

[0182] d. Purpose ID that can identify the purpose of WUS

[0183] - For example, a terminal may transmit a WUS to request SSB transmission and may transmit a destination ID indicating this.

[0184] - For example, a terminal can send a WUS for handover and transmit a destination ID indicating it.

[0185] The above purpose ID is specified in the specification and may be known in advance by both terminals and base stations.

[0186] The above purpose ID can be set by any function of the core network, such as AMF, to the base station and terminal.

[0187] The above-mentioned destination ID may be set by the base station to the terminal. This may be included in a broadcast signal transmitted by the base station to the terminal, such as a master information block (MIB) included in an SSB, or a system information block (SIB). Alternatively, it may be included in a unicast signal transmitted by the base station specifically to the terminal, such as an RRC signal, MAC signal, or PHY signal.

[0188] The above information may include an indicator that can distinguish cells currently operating in Deep Sleep mode, for example, an indicator in the form of a 1-bit indicator included in each cell information.

[0189] The above information may include an indicator that can distinguish the cell in which MR is currently on, for example, an indicator in the form of including a 1-bit indicator in each cell information.

[0190] The above information may implicitly imply that all cells included in the information are operating in deep sleep mode. In other words, the base station may configure and transmit the above information only for cells currently operating in deep sleep.

[0191] The above signal may be included in a broadcast signal transmitted by the base station to the terminal, for example, a master information block (MIB) included in an SSB, or in any system information block (SIB).

[0192] Alternatively, it may be transmitted by being included in a unicast signal transmitted by the base station to a specific terminal, such as an RRC signal, MAC signal, or PHY signal.

[0193] Information about the UL WUS signals (3-5, 4-7, 5-7, 6-7, 8-7) described in the above embodiments and the conditions and resources for transmitting the signals are transmitted by being included in the configuration signals (3-3, 4-5, 5-5, 6-5, 8-5) transmitted by the base station to the terminal in the above embodiments, and may be some or all of the following various technologies.

[0194] The triggering condition of the above UL WUS signal (3-5, 4-7, 5-7, 6-7, 8-7) may be one of the following.

[0195] When a UE determines that the time / frequency synchronization of a specific SCell is out of sync, it can trigger the UL WUS signal to request on-demand SSB transmission of the SCell. The UE may determine that the time / frequency synchronization of a specific SCell is out of sync based on one or more of the following conditions.

[0196] - Lastly, if the timer expires after a certain timer, such as the ul synchronization timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the PDCCH signal successfully received by the terminal.

[0197] - When the timer expires after a certain timer, such as the ul synchronization timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the PDCCH signal successfully received by the terminal or the PUCCH signal successfully transmitted.

[0198] - When the reception of any downlink signal attempted by the terminal fails more than a certain number of times (retry limit1) set by the network in advance by any downlink signal, such as an RRC Reconfiguration signal.

[0199] - When the transmission of any uplink signal attempted by the terminal fails more than a certain number of times (retry limit1) set by the network in advance by any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0200] Alternatively, when the terminal determines that the time / frequency synchronization of a certain cell is not aligned, it can trigger the UL WUS signal to request on-demand SSB transmission to the reference cell of the corresponding cell. The reference cell is a cell capable of transmitting and receiving a reference signal that can synchronize the cell, and may be an SCell or a PCell. The method by which the terminal determines that the time / frequency synchronization of a specific cell is not aligned may be one or more of the following conditions.

[0201] - Lastly, if the timer expires after a certain timer, such as the ul synchronization timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the PDCCH signal successfully received by the terminal.

[0202] - When the timer expires after a certain timer, such as the ul synchronization timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the PDCCH signal successfully received by the terminal or the PUCCH signal successfully transmitted.

[0203] - When the reception of any downlink signal attempted by the terminal fails more than a certain number of times (retry limit1) set by the network in advance by any downlink signal, such as an RRC Reconfiguration signal.

[0204] - When the transmission of any uplink signal attempted by the terminal fails more than a certain number of times (retry limit1) set by the network in advance by any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0205] When the UE determines that the SSB transmission period of a specific SCell is longer than necessary, it can trigger the UL WUS signal to request on-demand SSB transmission of the SCell. The method by which the UE determines that the SSB transmission period of a specific SCell is longer than necessary may be one or more of the following conditions. The following examples are examples for System Information, SSB, and CSI-RS transmission of the SCell.

[0206] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC setting) within the System Information signal received by the terminal is longer than the SSB measurement cycle of any service required by the terminal.

[0207] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC configuration) within the System Information signal received by the terminal is longer than the SSB measurement cycle that is correlated with any service required and provided by the upper layer of the terminal, e.g., core network, e.g., any network slice, or any service ID.

[0208] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC setting) within the System Information signal received by the terminal is longer than any SSB measurement cycle determined by the terminal to be necessary.

[0209] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC configuration) in the System Information signal received by the terminal is longer than the SSB measurement cycle previously set by the network through any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0210] - Lastly, if the timer expires after a certain timer, such as the required SSB timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the SSB signal successfully received by the terminal.

[0211] - Lastly, if a specific period, such as the required SSB period, that the network has previously set for a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, has elapsed since the SSB signal successfully received by the terminal.

[0212] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than the CSI-RS measurement cycle of any service required by the terminal.

[0213] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than the CSI-RS measurement cycle that is correlated with a service required and provided by the upper layer of the terminal, such as a core network, such as a network slice, or a service ID.

[0214] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than any CSI-RS measurement cycle determined by the terminal to be necessary.

[0215] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than the CSI-RS measurement cycle set by the network in advance by any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0216] - Lastly, if the timer expires after a certain timer, such as the required CSI-RS timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the CSI-RS signal successfully received by the terminal.

[0217] - Lastly, if a specific period, such as the required CSI-RS period, that the network has previously set with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, has elapsed since the CSI-RS signal successfully received by the terminal.

[0218] When the UE determines that the SSB transmission cycle of a specific PCell is longer than necessary, it can trigger the UL WUS signal to request on-demand SSB transmission of the connected SCell. The UE may determine that the SSB transmission cycle of a specific PCell is longer than necessary based on one or more of the following conditions. The following examples illustrate examples of System Information, SSB, and CSI-RS transmission of a specific PCell.

[0219] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC setting) within the System Information signal received by the terminal is longer than the SSB measurement cycle of any service required by the terminal.

[0220] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC configuration) within the System Information signal received by the terminal is longer than the SSB measurement cycle that is correlated with any service required and provided by the upper layer of the terminal, e.g., core network, e.g., any network slice, or any service ID.

[0221] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC setting) within the System Information signal received by the terminal is longer than any SSB measurement cycle determined by the terminal to be necessary.

[0222] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC configuration) in the System Information signal received by the terminal is longer than the SSB measurement cycle previously set by the network through any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0223] - Lastly, if the timer expires after a certain timer, such as the required SSB timer, has elapsed since the terminal successfully received the SSB signal, and the network previously set a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0224] - Lastly, if a specific period, such as the required SSB period, that the network has previously set for a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, has elapsed since the SSB signal successfully received by the terminal.

[0225] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than the CSI-RS measurement cycle of any service required by the terminal.

[0226] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than the CSI-RS measurement cycle that is correlated with a service required and provided by the upper layer of the terminal, such as a core network, such as a network slice, or a service ID.

[0227] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than any CSI-RS measurement cycle determined by the terminal to be necessary.

[0228] - When the CSI-RS transmission / reception cycle set by the base station configuration signal received by the terminal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, is longer than the CSI-RS measurement cycle set by the network in advance by any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0229] - Lastly, if the timer expires after a certain timer, such as the required CSI-RS timer, has been set by the network in advance with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, from the CSI-RS signal successfully received by the terminal.

[0230] - Lastly, if a specific period, such as the required CSI-RS period, that the network has previously set with a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, has elapsed since the CSI-RS signal successfully received by the terminal.

[0231] The terminal can trigger UL WUS transmission to the SCell based on an indication provided by the PCell. The indication provided by the PCell may be included in any signal transmitted, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0232] When a UE determines that the measurement frequency of a specific SCell is longer than necessary, it can trigger the UL WUS signal to request on-demand SSB transmission of the connected SCell. The UE may determine that the measurement cycle of a specific SCell is longer than necessary based on one or more of the following conditions. The following examples illustrate transmission of System Information, SSB, and CSI-RS of a specific SCell.

[0233] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC setting) in the System Information signal received by the terminal is longer than the measurement update cycle for RRM measurement of any service required by the terminal, e.g., the SSB reception cycle.

[0234] - If the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC configuration) in the System Information signal received by the terminal is longer than the measurement update cycle for RRM measurement, e.g., the SSB reception cycle, which is related to any service required and provided by the upper layer of the terminal, e.g., the core network, e.g., any network slice, or any service ID.

[0235] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC setting) within the System Information signal received by the terminal is longer than any SSB measurement cycle determined by the terminal to be necessary.

[0236] - When the SSB transmission cycle (e.g., measurement cycle in the SSB measurement time configuration, hereinafter referred to as SMTC configuration) in the System Information signal received by the terminal is longer than the SSB measurement cycle previously set by the network through any downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0237] - Lastly, if the timer expires after a certain timer, such as the required SSB timer, has elapsed since the terminal successfully received the SSB signal, and the network previously set a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI.

[0238] - Lastly, if a specific period, such as the required SSB period, that the network has previously set for a downlink signal, such as an RRC signal such as RRC Reconfiguration, a MAC signal such as MAC-CE, or a PHY signal such as DCI, has elapsed since the SSB signal successfully received by the terminal.

[0239] When a terminal determines that measurement of a specific cell is necessary, if the cell is not transmitting SSB, the terminal may trigger the UL WUS signal to request on-demand SSB transmission from the cell. The terminal may determine that measurement of a specific cell is necessary based on one or more of the following conditions.

[0240] - When new or changed measurement settings for a specific Cell are received from the upper layer.

[0241] - When PCell receives new or changed measurement settings for a specific cell.

[0242] - When the SCell activation settings are sent to the terminal from the PCell, but the SCell is not transmitting SSB.

[0243] When a terminal determines that a change in the SSB transmission pattern of a specific cell is necessary, the terminal may trigger the UL WUS signal to request a change in the SSB transmission pattern from the cell. The method by which the terminal determines that a change in the SSB transmission pattern of a specific cell is necessary may be one or more of the following conditions.

[0244] - When received from the upper layer including a setting that instructs to change the SSB transmission pattern of a specific cell.

[0245] - When received from PCell including a setting instructing to change the SSB transmission pattern of a specific cell.

[0246] - When a configuration including the SSB transmission pattern of a specific cell is received from the PCell, but the SSB transmission pattern of the SCell is different from the configured pattern.

[0247] The above signal may include terminal preferences. For example, the UL WUS signal may include the SSB cycle or pattern required / preferred by the terminal.

[0248] The above on-demand SSB setup signal (3-3, 4-5, 5-5, 6-5, 8-5) may include the cell ID of a base station capable of receiving the signal.

[0249] The above-mentioned on-demand SSB configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) may be included in a signal transmitted through a broadcast channel (physical broadcast channel, PBCH), such as system information broadcast to an unspecified number of terminals, for example, master information bit (MIB), system information bit (SIB), etc. Or, it may be an RRC signal, such as RRC Reconfiguration, a MAC signal, such as MAC CE, or a DCI signal transmitted to a terminal group or a specific terminal.

[0250] The above on-demand SSB configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) can be configured in a form that includes an indicator indicating that UL WUS can be transmitted on an uplink resource that was previously transmitted, for example, a Physical Random access channel (PRACH) resource for random access or a UL SR that transmits a scheduling request.

[0251] The above on-demand SSB setup signal (3-3, 4-5, 5-5, 6-5, 8-5) can be transmitted by including the cell ID of the cell in conjunction with the UL WUS setup when setting the UL WUS of the adjacent cell.

[0252] The above UL WUS signal (3-5, 4-7, 5-7, 6-7, 8-7) may be one of the signals below, and accordingly the on-demand SSB configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) may provide the relevant configuration.

[0253] a. The above UL WUS signal may be a Random Access (RA) Preamble signal. To this end, the base station may transmit a configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) to the terminal, including some or all of the following resources for transmitting the RA Preamble.

[0254] - RA preamble sequence number: The base station can specify an RA preamble sequence that the terminal can use to request on-demand SSB transmission. For this purpose, a list or range of one or more sequence numbers can be included in the configuration signal (3-3, 4-5, 5-5, 6-5, 8-5).

[0255] - Uplink PRACH (Physical Random Access transmission channel) resource information: The base station can designate uplink resources on which the UE can transmit an RA preamble to request on-demand SSB transmission. To this end, uplink PRACH resource information, such as frequency (ARFCN), Bandwidth part ID, time (subframe number, slot number, radioframe number, symbol number), etc., or a formula for calculating the information and parameters required for the formula can be included in the configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) and provided to the UE.

[0256] - The above Random Access procedure may be a general contention-based random access (rach-ConfigCommon-on-demandSSB). In this case, the base station may not specify the RA preamble sequence that the terminal transmits for an on-demand SSB request, or may set a pool, region, or range of RA preamble sequences that can be used for the purpose and allow the terminal to randomly select one of these sequences each time. The contention-based random access may be performed by allocating any PRACH resource set by the base station, for example, any general PRACH resource that allows the terminal to perform random access for various purposes, or may be performed through any PRACH resource set by the base station exclusively for on-demand SSB.

[0257] - The above Random Access procedure may be a dedicated random access procedure in which the base station configures specific resources, for example, a sequence (ra-PreambleIndex) and / or PRACH resources, and only the corresponding sequence / resource can be used (rach-ConfigDedicated-on-demandSSB).

[0258] - The above Random Access procedure may be a 2-step random access procedure in which the terminal transmits Preamble and msg3 combined (rach-ConfigCommonTwoStepRA-on-demandSSB, or msgA-ConfigCommon-on-demandSSB).

[0259] - In addition to this, the above random access procedure may be a procedure that uses any random access preamble that allows the terminal to transmit the preamble to the base station without uplink synchronization.

[0260] - The configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) including the above random access related resource information may be any RRC signal including RACH-Config configuration, for example, an RRCReconfig message, and the random access resource may be in various forms (for example, [Table 1] or [Table 2]) within the uplink PRACH configuration.

[0261] [Table 1]

[0262]

[0263] [Table 2]

[0264]

[0265]

[0266]

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273] b. The above UL WUS signal may be a Scheduling Request (hereinafter referred to as SR) signal. To this end, the base station may transmit a configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) to the terminal, including some or all of the following resources for the SR transmission.

[0274] - SR Indicator: The base station can designate an SR indicator, such as a Scheduling request ID, that the terminal can use to request On-demand SSB transmission. To this end, one or more integers can be specified as a dedicated ID for On-demand SSB transmission, for example, with a name such as SchedulingRequestId-on-demand-SSB-SCell, and the ID or a list of IDs can be included in the configuration signal (3-3, 4-5, 5-5, 6-5, 8-5).

[0275] - Uplink SR resource information: The base station can designate uplink resources on which SR can be transmitted to request On-demand SSB transmission by the terminal. To this end, the base station can provide the terminal with SchedulingRequestConfig resource information, such as frequency (ARFCN), Bandwidth part ID, time (subframe number, slot number, radioframe number, symbol number), etc., or a formula for calculating the information and parameters required for the formula, included in the configuration signal (3-3, 4-5, 5-5, 6-5, 8-5).

[0276] - The configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) including the above SR related resource information may be any RRC signal including MAC-CellGrouConfig configuration, for example, an RRCReconfig message, and the MAC-CellGroupConfig configuration may include an SR ID configuration as follows (for example, [Table 3]).

[0277] [Table 3]

[0278]

[0279] c. The above UL WUS signal may be a signal that can be transmitted using any new transceiver described in FIG. 9, such as wake up radio (WUR), a low-power radio access technology possessed by the terminal. To this end, the base station may transmit a configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) to the terminal, including some or all of the following resources for WUS transmission via the WUR.

[0280] - UL WUR Indicator: The base station can specify an indicator, for example, a radio ID, indicating the WUR that the terminal can use to request on-demand SSB transmission.

[0281] - UL WUS Indicator: The base station can designate unique resource information, such as an indicator, signal ID or UL WUS sequence number, indicating a signal that the terminal can use to request on-demand SSB transmission.

[0282] - Uplink resource information: The base station can designate uplink resources on which the terminal can transmit UL WUS to request On-demand SSB transmission. To this end, the base station can provide the terminal with SchedulingRequestConfig resource information, such as frequency (ARFCN), Bandwidth part ID, time (subframe number, slot number, radioframe number, symbol number), etc., or a formula for calculating the information and parameters required for the formula, included in the configuration signal (3-3, 4-5, 5-5, 6-5, 8-5).

[0283] - The configuration signal (3-3, 4-5, 5-5, 6-5, 8-5) including the above ul wus related resource information may be any RRC signal including MAC-CellGrouConfig configuration, for example, an RRCReconfig message, and may be transmitted via the main radio or via WUR.

[0284] In the above embodiments, any base station may be a single base station encompassing CU and DU, or may be a simplified base station having only some of the functions of CU, DU, etc.

[0285] FIG. 10 is a diagram illustrating the structure of a base station (1000) according to one embodiment of the present disclosure.

[0286] Referring to FIG. 10, a base station (1000) may include a transceiver (1010), a control unit (1020), and a storage unit (1030). The transceiver (1010), the control unit (1020), and the storage unit (1030) may operate according to the communication method of the base station described above. In addition, a network device may also correspond to the structure of the base station. 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. For example, the base station may include a transceiver and a control unit. In addition, the transceiver, the control unit, and the storage unit may be implemented in the form of a single chip.

[0287] The transceiver (1010) is a general term for the receiver and transmitter of the base station, and can transmit and receive signals with terminals, other base stations, or other network devices. At this time, the transmitted and received signals may include control information and data. The transceiver (1010) may transmit system information to the terminal, for example, and may transmit a synchronization signal or a reference signal. To this end, the transceiver (1010) may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-down-converts a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver. The transceiver (1010) may include a wired or wireless transceiver, and may include various configurations for transmitting and receiving signals. In addition, the transceiver (1010) can receive a signal through a communication channel (e.g., a wireless channel) and output it to the control unit (1020), and transmit the signal output from the control unit (1020) through the communication channel. In addition, the transceiver (1010) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to a terminal, another base station, or another entity through a wired or wireless network.

[0288] The storage unit (1030) (i.e., memory) can store programs and data required for the operation of the base station (1000). In addition, the storage unit (1030) can store control information or data included in a signal acquired from the base station (1000). The storage unit (1030) 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, the storage unit (1030) can store at least one of information transmitted and received through the transceiver unit (1010) and information generated through the control unit (1020).

[0289] In the present disclosure, the control unit (1020) may be defined as a circuit or application-specific integrated circuit or at least one processor. The processor (1020) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit (1020) may control the overall operation of the base station (1000) according to the embodiments proposed in the present disclosure. For example, the control unit may control the signal flow between each block to perform operations according to the flowchart described above. The control unit (1020) may control the overall operation of the base station (1000) according to the embodiments proposed in the present disclosure by executing one or more commands stored in the memory (1030).

[0290] At least one processor (1020) 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 the 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 multiple 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 of the disclosed functions in a distributed manner. The at least one processor may execute program instructions to achieve or perform various functions.

[0291] FIG. 11 is a diagram illustrating the structure of a terminal (1100) according to one embodiment of the present disclosure.

[0292] Referring to FIG. 11, the terminal (1100) may include a transceiver (1110), a control unit (1120), and a storage unit (1130). The transceiver (1110), the control unit (1120), and the storage unit (1130) may operate according to the communication method of the terminal described above. However, the components of the terminal are not limited to the examples described above. For example, the terminal (1100) may include more or fewer components than the components described above. For example, the terminal (1100) may include a transceiver and a control unit. In addition, the transceiver, the control unit, and the storage unit may be implemented in the form of a single chip.

[0293] The transceiver (1110) is a general term for the receiver and transmitter of a terminal, and can transmit and receive signals with a base station, another terminal, or a network entity. The signals transmitted and received with the base station may include control information and data. The transceiver (1110) may, for example, receive system information from the base station and receive a synchronization signal or a reference signal. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts the received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver. In addition, the transceiver (1110) may include wired and wireless transceivers, and may include various configurations for transmitting and receiving signals. In addition, the transceiver (1110) may receive a signal through a wireless channel, output it to a control unit, and transmit a signal output from the control unit through the wireless channel. Additionally, the transceiver (1110) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to a network entity via a wired or wireless network.

[0294] The storage unit (1130) (i.e., memory) can store programs and data required for the operation of the terminal. In addition, the memory (1130) can store control information or data included in signals obtained from the terminal. The storage unit (1130) 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.

[0295] In the present disclosure, the control unit (1120) may be defined as a circuit or application-specific integrated circuit or at least one processor. The processor (1120) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit (1120) may control the overall operation of the terminal (1100) according to the embodiments proposed in the present disclosure. For example, the control unit (1120) may control the signal flow between each block to perform operations according to the flowchart described above. The control unit (1120) may control the overall operation of the terminal (1100) according to the embodiments proposed in the present disclosure by executing one or more commands stored in the memory (1130).

[0296] At least one processor (1120) 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 the 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 multiple 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 of the disclosed functions in a distributed manner. The at least one processor may execute program instructions to achieve or perform various functions.

[0297] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0298] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present invention.

[0299] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0300] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present invention via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present invention.

[0301] In the specific embodiments of the present disclosure described above, components included in the invention 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 invention is not limited to singular or plural components. Even components expressed in the plural form may be composed of singular elements, or even components expressed in the singular form may be composed of plural elements.

[0302] 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 the present invention. Therefore, the scope of the present invention 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.

[0303] The specific examples for explaining embodiments according to the present disclosure are only one combination of each criterion, method, detailed method, and operation, and through a combination of at least two or more of the various techniques described, a terminal or base station can transmit an SSB signal by waking up from sleep mode only when necessary in a wireless communication system, thereby further reducing network power consumption. In addition, at this time, the operation may be performed according to a method determined through one or a combination of at least two or more of the above-described techniques. For example, it may be possible to perform a part of the operation of one embodiment in combination with a part of the operation of another embodiment.

Claims

1. In a wireless communication system, a method of UE (user equipment), A step of transmitting a wake-up signal (WUS) requesting on-demand SSB (Synchronization signal block) transmission to a base station; A step of receiving a Short Message from the base station; the Short Message includes information indicating that system information has been changed based on a WUS requesting on-demand SSB transmission of the UE; and A method comprising: receiving changed system information from the base station.

2. In the first paragraph, the Short Message is received through RRC (Radio Resource control) signaling, MAC CE (medium access control control element) or DCI (downlink control information).

3. In the first paragraph, the step of transmitting the WUS requesting the on-demand SSB transmission is: A step of receiving WUS-related configuration information requesting on-demand SSB transmission from the base station; the WUS-related configuration information includes information on triggering conditions for WUS transmission and information on resources for WUS transmission; A step of determining whether a triggering condition for WUS transmission is satisfied; and A method comprising the step of transmitting, to the base station, a WUS requesting the on-demand SSB transmission based on information about resources for the WUS transmission, when a triggering condition for the WUS transmission is satisfied.

4. In paragraph 3, The above base station may be a base station to which at least one of a primary cell (PCell) or a secondary cell (SCell) belongs, and A method in which the information about resources for the above WUS transmission includes at least one of information about resources of a PCell capable of transmitting a WUS requesting on-demand SSB transmission or information about resources of a SCell capable of transmitting a WUS requesting on-demand SSB transmission.

5. In the third paragraph, the WUS related setting information is: Information about time resources that can transmit WUS or information about frequency resources that can transmit WUS; The ID of the triggering condition for WUS transmission or a list of triggering condition IDs; A list of sequence IDs or sequence IDs that can be transmitted to WUS; ID of information or list of information IDs that can be transmitted to WUS; Information indicating that the UE can transmit WUS when the base station is operating in deep sleep mode; A list of cell IDs or cell IDs to which the above WUS-related setting information is applicable; Information indicating that the above WUS-related setting information is cell common information; Information about cells currently operating in deep sleep mode; Information about the cell whose MR (main radio) is currently turned on; or Information indicating to reuse resources for PRACH (physical random access channel) or SR (scheduling request); A method comprising at least one of:

6. In the third paragraph, the triggering condition for the WUS transmission is: If you determine that a specific cell is out of sync; If it is determined that the SSB transmission period of a specific cell is longer than a specified length; When receiving a WUS transmission instruction from Pcell to SCell; If it is determined that the measurement frequency of a specific cell is longer than a specified length; If you determine that measurement of a specific cell is necessary; or If it is determined that a change in the SSB transmission pattern of a specific cell is necessary; A method comprising at least one of:

7. In the first paragraph, the WUS, Sequence to be transmitted to WUS; The ID of the terminal or a part of the ID of the terminal; or Information indicating that this is a WUS requesting on-demand SSB transmission; A method comprising at least one of:

8. In paragraph 3, The above WUS is an RA (Random access) preamble, A method wherein the WUS-related configuration information includes at least one of: information about an RA sequence number that can be used for an on-demand SSB transmission request; or information about a resource that can transmit an RA preamble for an on-demand SSB transmission request.

9. In paragraph 3, The above WUS is SR (scheduling request), A method wherein the above WUS-related configuration information includes at least one of: information about an SR that can be used for an on-demand SSB transmission request; or information about a resource that can transmit an SR for an on-demand SSB transmission request.

10. In paragraph 3, The above WUS is a signal that can be transmitted using WUR (wake-up radio); A method wherein the WUS-related configuration information includes at least one of: information about a WUR that can be used for an on-demand SSB transmission request; information about a signal that can be used for an on-demand SSB transmission request; or information about a resource that can transmit a WUS using a WUR.

11. In the third paragraph, the WUS-related setting information is received via RRC signaling, MAC CE or DCI.

12. In a wireless communication system, in a method of a base station, A step of receiving a WUS (wake-up signal) requesting on-demand SSB (Synchronization signal block) transmission from a UE (user equipment); A step of transmitting a Short Message to the UE; the Short Message includes information indicating that system information has been changed based on a WUS requesting on-demand SSB transmission of the UE; and A method comprising: a step of transmitting changed system information to the UE; 13. In a wireless communication system, in UE (user equipment), memory for storing one or more instructions; and At least one processor; wherein the at least one processor executes the one or more instructions stored in the memory by: Transmitting a WUS (wake-up signal) to the base station requesting on-demand SSB (Synchronization signal block) transmission; Receiving a Short Message from the base station; wherein the Short Message includes information indicating that system information has changed based on a WUS requesting on-demand SSB transmission of the UE; and UE, which receives changed system information from the above base station..

14. In the 13th paragraph, in order to transmit the WUS requesting the on-demand SSB transmission, the at least one processor executes the one or more instructions stored in the memory: Receive WUS-related configuration information requesting on-demand SSB transmission from the base station; the WUS-related configuration information includes information on triggering conditions for WUS transmission and information on resources for WUS transmission; Determine whether the triggering conditions for WUS transmission are satisfied; and A UE that transmits a WUS requesting the on-demand SSB transmission to the base station based on information about resources for the WUS transmission when the triggering condition for the WUS transmission is satisfied.

15. In a wireless communication system, at a base station, memory for storing one or more instructions; and At least one processor; wherein the at least one processor executes the one or more instructions stored in the memory by: Receive a WUS (wake-up signal) requesting on-demand SSB (Synchronization signal block) transmission from a UE (user equipment); Transmitting a Short Message to the UE; wherein the Short Message includes information indicating that system information has changed based on a WUS requesting on-demand SSB transmission of the UE; and A base station that transmits changed system information to the UE.

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