Method and device for transmitting wake-up signal in wireless communication system

Abstract

A method for operating a terminal in a wireless communication system, according to an embodiment of the present disclosure, may comprise the steps of: receiving, from a serving cell, first configuration information for wake-up signal (WUS) transmission and second configuration information for a timer for preventing WUS transmission; determining whether a condition for WUS transmission is satisfied on the basis of the first configuration information; and transmitting a first WUS to a neighbour cell and starting the timer, when the condition is satisfied.

Description

Method and device for transmitting a wake-up signal 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 signal transmission and reception method and device for setting a trigger condition for a terminal to transmit a wake-up signal (hereinafter referred to as a WUS) and transmitting the WUS according to the trigger in order to wake up cells when a base station or a cell's transceiver enters a sleep mode in a Network Energy Saving (NES) system supporting power saving technology.

[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] Meanwhile, methods and devices for supporting mobility using location information of terminals in non-terrestrial network systems have been proposed, and for terminals that can utilize these, the need for a mobility support method that utilizes relative location measurements between the terminal and the network, which is different from the existing signal strength-based mobility support method, has arisen.

[0009] The present disclosure provides a method and device for transmitting a wake-up signal of a terminal to support power saving mode operation of a network in a wireless communication system.

[0010] According to one aspect of one embodiment of the present disclosure, a method of operating a terminal may include: receiving first configuration information for transmitting a wake-up signal (WUS) from a serving cell and second configuration information for a timer for preventing WUS transmission; determining, based on the first configuration information, whether a condition for transmitting the WUS is satisfied; and, if the condition is satisfied, transmitting a first WUS to an adjacent cell and starting the timer.

[0011] According to one aspect of an embodiment of the present disclosure, a terminal is provided, comprising: a transceiver; and at least one control unit coupled to the transceiver, wherein the at least one control unit receives first configuration information for transmitting a wake-up signal (WUS) from a serving cell and second configuration information for a timer for preventing WUS transmission, and determines whether a condition for transmitting the WUS is satisfied based on the first configuration information, and if the condition is satisfied, transmits a first WUS to an adjacent cell and starts the timer.

[0012] 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.

[0013] According to one embodiment of the present disclosure, power consumption of a network can be further reduced by enabling the network to wake up from sleep mode and transmit and receive signals only when necessary in a wireless communication system.

[0014] 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.

[0015] 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.

[0016] FIG. 2 is a diagram for explaining the NES mode concept of a base station or cell according to one embodiment of the present disclosure.

[0017] FIG. 3 is a diagram illustrating an example of a WUS transmission procedure of a terminal according to an embodiment of the present disclosure.

[0018] FIG. 4 is a diagram illustrating a method for limiting WUS repetitive transmission using a timer according to one embodiment of the present disclosure.

[0019] FIG. 5 is a diagram illustrating a method for repeating WUS transmission of a terminal according to cell settings according to an embodiment of the present disclosure.

[0020] FIG. 6 is a diagram illustrating a signaling procedure for setting a timer between cells according to one embodiment of the present disclosure.

[0021] FIG. 7 is a diagram illustrating a signaling procedure for reactivating a sleep mode of an adjacent cell according to an embodiment of the present disclosure.

[0022] FIG. 8 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0023] FIG. 9 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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).

[0030] 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.

[0031] Referring to FIG. 1, a next-generation mobile communication system supporting network energy saving may be configured with 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 configured with a CU (1-02, Central Unit) and one or more DUs (1-03, 1-04, Distributed Unit).

[0032] 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).

[0033] UE (1-09) can access an external network via gNB (1-01) through the cell.

[0034] FIG. 2 is a diagram for explaining the NES mode concept of a base station or cell according to one embodiment of the present disclosure.

[0035] Referring to FIG. 2, if a base station supporting the Wake Up Radio (WUR) function is called a WUR BS (2-01) and a terminal supporting the Wake Up Radio (WUR) function is called a WUR UE (2-04), then this WUR BS may have a Main Radio (2-02, MR) for performing wireless communication with the WUR UE and a WUR (2-03) for performing a Wake Up operation, and this WUR UE (2-04) may have a Main Radio (2-05, MR) for performing wireless communication with the WUR BS (2-01) and a WUR (2-06) for performing a Wake Up operation. At this time, the MR (2-02) of the WUR BS (2-01) can perform wireless communication with the MR (2-05) of the WUR UE (2-04) or other UE, and the WUR (2-03) of the WUR BS (2-01) can perform wireless communication with the WUR (2-06) of the WUR UE (2-04).

[0036] In one embodiment, the WUR may be a single, but logically distinct, module, rather than two physically different modules as part of the MR.

[0037] In one embodiment, the WUR may be part of the MR, both physically and logically.

[0038] WUR BS and WUR UE can have the following operational configuration states.

[0039] 1. Full On state with both MR and WUR turned on

[0040] 2. MR On state where only MR is on and WUR is off

[0041] 3. Deep Sleep state where MR is off and only WUR is on

[0042] 4. Full Off state with both MR and WUR turned off

[0043] 5. Light Sleep state where MR is on but some signals such as SSB, SIB, etc. are not transmitted and power is saved.

[0044] In order for a terminal to successfully transmit WUS to adjacent cells, the serving cell (or the base station to which the cell belongs) may need to provide the terminal with information on the WUS receivable resources of the adjacent cells.

[0045] A serving cell can determine which neighboring cells with overlapping coverage within its coverage can receive WUS through which resources (time, frequency) and in which manner (periodic or aperiodic, etc.) using WUR, and can share this information with the cells.

[0046] The base station of the cell can transmit a signal containing all or part of the following WUS resource information to the terminal.

[0047] - Time / frequency resource information that can transmit WUS,

[0048] ■ Resource information including subframe / radio frame / slot time information that has some rule that repeats periodically, for example.

[0049] ■ Resource information including, for example, WUS transmission time duration, absolute time, number of slots, number of frames, etc.

[0050] ■ Resource information including absolute time, number of slots, number of frames, timer, etc. to indicate the start time when WUS transmission is possible from the time the signal is received.

[0051] ■ Resource information including the ID of the frequency band, which refers to a certain frequency band, for example.

[0052] ■ Resource information including, for example, the ID of the resource block indicating a certain starting frequency, the bandwidth indicating the frequency bandwidth, the number of unit resource block frequency bandwidths, etc.

[0053] ■ 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.

[0054] - A sequence ID or list of sequence IDs that can specify sequences that can be transmitted to WUS.

[0055] - An ID of information or a list of information IDs that indicate the type of information that can be transmitted to WUS.

[0056] - A list of condition IDs or condition IDs that indicate the type of condition that can transmit WUS.

[0057] - An indication that the terminal can transmit WUS when the base station is operating in Deep Sleep mode.

[0058] - The above information may be information about the base station transmitting the signal.

[0059] - The above information may be information of a base station (or cell) adjacent to the base station transmitting the signal, and in this case, may include a base station ID or cell ID or a base station ID list or cell ID list.

[0060] - The above information may be applied 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.

[0061] - The above information may be information that is applied equally to all adjacent base stations or cells (cell common information), and in this case, it may include an indicator (e.g., 1 bit indication) that notifies the terminal of the relevant information.

[0062] - The above information may have a structure and format similar to or identical to PRACH (Physical Random Access Channel) configuration information.

[0063] The WUS transmitted by the terminal may contain all or part of the following information:

[0064] - Sequence transmitted to WUS

[0065] - ID of the terminal that transmitted WUS

[0066] - Part of the ID of the terminal that transmitted the WUS

[0067] - Purpose ID that can identify the purpose of WUS

[0068] ■ For example, a terminal may transmit a WUS to request SSB transmission and may transmit a destination ID indicating this.

[0069] ■ For example, a terminal can send a WUS for handover and transmit a destination ID indicating it.

[0070] The above purpose ID is specified in the specification and may be known in advance by both terminals and base stations.

[0071] The above purpose ID can be set by any entity of the core network, such as AMF, to the base station and terminal.

[0072] 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 in any system information block (SIB). Alternatively, the above-mentioned destination ID may be included in a unicast signal transmitted by the base station specifically to the terminal, such as an RRC signal, a MAC signal, or a PHY signal.

[0073] 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.

[0074] 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 an indicator including 1 bit in each cell information.

[0075] 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.

[0076] The 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 a system information block (SIB). Alternatively, the signal may be included in a unicast signal transmitted by the base station specifically to the terminal, for example, an RRC signal, a MAC signal, or a PHY signal.

[0077] FIG. 3 is a diagram illustrating an example of a WUS transmission procedure of a terminal according to an embodiment of the present disclosure.

[0078] According to FIG. 3, in step 3-05, the terminal can receive a signal including configuration information including conditions for transmitting WUS from a connected serving cell.

[0079] In one embodiment, the terminal may receive configuration information (e.g., Config WUS Trigger) for conditions for WUS transmission using measurement values ​​of the serving cell or neighboring cells from the serving cell. The serving cell may set a trigger condition to transmit WUS by deriving a reference signal and a measurement value of the cell by measuring a reference signal, such as a Synchronization Signal Block (SSB) or a Channel State Information Reference Signal (CSI-RS), and comparing the measurement value with a threshold set by the serving cell.

[0080] In steps 3-10, the terminal can measure and evaluate whether a trigger condition is satisfied. For example, the terminal can trigger the transmission of WUS based on the following judgment criteria (conditions).

[0081] 1. Event A2 (Serving becomes worse than threshold)

[0082] The terminal can compare the measurement value of the serving cell with a threshold set by the base station (e.g., an RRC signal, a MAC signal, or a PHY signal), and trigger the transmission of a WUS if the measurement value of the serving cell is lower than the threshold. For example, the operation of the terminal can be defined as shown in Table 1 below.

[0083] The UE may:1> consider the entering condition for this event to be satisfied when condition A2-1, as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A2-2, as specified below, is fulfilled;1> for this measurement, consider the serving cell indicated by themeasObjectNRassociated to this event.Inequality A2-1 (Entering condition)Ms + Hys < ThreshInequality A2-2 (Leaving condition)Ms - Hys > ThreshThe variables in the formula are defined as follows:Msis the measurement result of the serving cell, not taking into account any offsets.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Threshis the threshold parameter for this event (i.e.a2-Thresholdas defined withinreportConfigNRfor this event).Msis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Hysis expressed in dB.Threshis expressed in the same unit asMs.

[0084] 2. Event A3 (Neighbor becomes offset better than SpCell)

[0085] The terminal attempts to perform measurements within the measurement frequency bands set by the base station or within the list of neighboring cells for measurement set by the base station. If the measurement value of a specific neighboring cell is greater than that of the serving cell by a certain offset or more, the terminal can trigger the transmission of a WUS to find a neighboring cell with better performance than the serving cell. For example, the operation of the terminal can be defined as shown in Table 2 below.

[0086] The UE may:1> consider the entering condition for this event to be satisfied when condition A3-1, as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A3-2, as specified below, is fulfilled;1> use the SpCell forMp,Ofp and Ocp.NOTE 1: The cell(s) that triggers the event has reference signals indicated in themeasObjectNRassociated to this event which may be different from the NR SpCellmeasObjectNR.Inequality A3-1 (Entering condition)Mn + Ofn + Ocn - Hys > Mp + Ofp + Ocp + OffInequality A3-2 (Leaving condition)Mn + Ofn + Ocn + Hys < Mp + Ofp + Ocp + OffThe variables in the formula are defined as follows:Mnis the measurement result of the neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the reference signal of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Mpis the measurement result of the SpCell, not taking into account any offsets.Ofpis the measurement object specific offset of the SpCell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the SpCell).Ocpis the cell specific offset of the SpCell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the SpCell), and is set to zero if not configured for the SpCell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Offis the offset parameter for this event (i.e.a3-Offsetas defined withinreportConfigNRfor this event).Mn, Mpare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn,Ocn,Ofp,Ocp,Hys,Offare expressed in dB.

[0087] 3. Event A4 (Neighbour becomes better than threshold)

[0088] The terminal attempts to measure within the measurement frequency bands set by the base station or within the list of adjacent cells for measurement set by the base station. If the measurement value of an adjacent cell among the searched cells is greater than a threshold set by the base station, the terminal can trigger the transmission of a WUS to find an adjacent cell with better performance than the cell in question. For example, the operation of the terminal can be defined as in Table 3 below.

[0089] The UE may:1> consider the entering condition for this event to be satisfied when condition A4-1, as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A4-2, as specified below, is fulfilled.Inequality A4-1 (Entering condition)Mn + Ofn + Ocn - Hys > ThreshInequality A4-2 (Leaving condition)Mn + Ofn + Ocn + Hys < ThreshThe variables in the formula are defined as follows:Mnis the measurement result of the neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the measurement object specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Threshis the threshold parameter for this event (iea4-Thresholdas defined withinreportConfigNRfor this event).Mnis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Threshis expressed in the same unit asMn.

[0090] 4. Event A5 (SpCell becomes worse than threshold1 and neighbor becomes better than threshold2)

[0091] The terminal may attempt to perform measurements within the measurement frequency bands set by the base station or within the neighboring cell list for measurement set by the base station, and may trigger transmission of a WUS if the measurement value of the serving cell is lower than any threshold 1 set by the base station and the neighboring cell is higher than any threshold 2 set by the base station. For example, the operation of the terminal may be defined as in Table 4 below.

[0092] The UE may:1> consider the entering condition for this event to be satisfied when both condition A5-1 and condition A5-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition A5-3 or condition A5-4, i.e. at least one of the two, as specified below, is fulfilled;1> use the SpCell forMp.NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality A5-1 (Entering condition 1)Mp + Hys < Thresh1Inequality A5-2 (Entering condition 2)Mn + Ofn + Ocn - Hys > Thresh2Inequality A5-3 (Leaving condition 1)Mp - Hys > Thresh1Inequality A5-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys < Thresh2The variables in the formula are defined as follows:Mpis the measurement result of the NR SpCell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Mpare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMp.Thresh2is expressed in the same unit asMn.

[0093] 5. Event NoCell (No active neighbor cells)

[0094] The terminal attempts to measure within the measurement frequency bands set by the base station or within the neighboring cell list for measurement set by the base station, and if no cell is found (either the measurement value is not significantly high or there is no cell with a measurement value higher than the cell search threshold set by the base station), it can trigger the transmission of a WUS. For example, the operation of the terminal can be defined as in Tables 5, 6, and 7 below.

[0095] The UE may:1> consider the entering condition for this event to be satisfied when condition NoCell-1 , as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition NoCell-2, as specified below, is fulfilled;1> for this measurement, consider the neighbouring cells indicated by themeasObjectNRassociated to this event.Inequality NoCell-1 (Entering condition)∀Mn + Ofn + Ocn + Hys < ThreshInequality NoCell-2 (Leaving condition)Mn + Ofn + Ocn - Hys > ThreshThe variables in the formula are defined as follows:Mnis the measurement result of a neighbouring cell, not taking into account any offsets.∀Mnis the measurement result of all the neighbouring cells, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Threshis the threshold parameter for this event (i.e.a2-Thresholdas defined withinreportConfigNRfor this event).Mnis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysis expressed in dB.Threshis expressed in the same unit asMs.

[0096] The UE may:1> consider the entering condition for this event to be satisfied when condition NoCell-1 , as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition NoCell-2, as specified below, is fulfilled;1> for this measurement, consider the neighbouring cells indicated by themeasObjectNRassociated to this event.Inequality NoCell-1 (Entering condition)BMn + Ofn + Ocn + Hys < ThreshInequality NoCell-2 (Leaving condition)Mn + Ofn + Ocn - Hys > ThreshThe variables in the formula are defined as follows:Mnis the measurement result of a neighbouring cell, not taking into account any offsets.BMnis the measurement result of the best neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Threshis the threshold parameter for this event (i.e.a2-Thresholdas defined withinreportConfigNRfor this event).Mnis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysis expressed in dB.Threshis expressed in the same unit asMs.

[0097] The UE may:1> consider the entering condition for this event to be satisfied when condition NoCell-1 , as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition NoCell-2, as specified below, is fulfilled;1> for this measurement, consider the neighboring cells indicated by themeasObjectNRassociated to this event.Inequality NoCell-1 (Entering condition)There is NO neighboring cell detectedInequality NoCell-2 (Leaving condition)There is at least one neighboring cell detected

[0098] 6. Event A4-2 (Neighbor becomes worse than threshold)

[0099] The terminal attempts to perform measurements within the measurement frequency bands set by the base station or within the list of neighboring cells for measurement set by the base station. If the measured values ​​of the searched cells are lower than a threshold set by the base station, the terminal can trigger the transmission of a WUS to find a neighboring cell with better performance. For example, the operation of the terminal can be defined as in Tables 8 and 9 below.

[0100] The UE may:1> consider the entering condition for this event to be satisfied when condition A4-2-1 , as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A4-2-2, as specified below, is fulfilled;1> for this measurement, consider the neighbouring cells indicated by themeasObjectNRassociated to this event.Inequality A4-2-1 (Entering condition)∀Mn + Ofn + Ocn + Hys < ThreshInequality A4-2-2 (Leaving condition)Mn + Ofn + Ocn - Hys > ThreshThe variables in the formula are defined as follows:Mnis the measurement result of a neighbouring cell, not taking into account any offsets.∀Mnis the measurement result of all the neighbouring cells, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Threshis the threshold parameter for this event (i.e.a2-Thresholdas defined withinreportConfigNRfor this event).Mnis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysis expressed in dB.Threshis expressed in the same unit asMs.

[0101] The UE may:1> consider the entering condition for this event to be satisfied when condition A4-2-1 , as specified below, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A4-2-2, as specified below, is fulfilled;1> for this measurement, consider the neighbouring cells indicated by themeasObjectNRassociated to this event.Inequality A4-2-1 (Entering condition)BMn + Ofn + Ocn + Hys < ThreshInequality A4-2-2 (Leaving condition)Mn + Ofn + Ocn - Hys > ThreshThe variables in the formula are defined as follows:Mnis the measurement result of a neighbouring cell, not taking into account any offsets.BMnis the measurement result of the best neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbor cell), and set to zero if not configured for the neighbor cell.Hysis the hysteresis parameter for this event (iehysteresisas defined withinreportConfigNRfor this event).Threshis the threshold parameter for this event (iea2-Thresholdas defined withinreportConfigNRfor this event).Mnis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysis expressed in dB.Threshis expressed in the same unit asMs.

[0102] 7. Event WUS1 (Serving becomes worse than threshold1 and No active neighbor cells)

[0103] The terminal may attempt to perform measurements within the serving cell and the measurement frequency bands configured by the base station or within the neighboring cell list for measurements configured by the base station, and if the measurement value of the serving cell is less than a threshold value 1 configured by the base station and no neighboring cell is searched (either the measurement value is not significantly high or there is no cell with a measurement value higher than the cell search threshold configured by the base station), the terminal may trigger transmission of a WUS to wake up the neighboring cell. For example, the operation of the terminal may be defined as in Table 10, Table 11, and Table 12 below.

[0104] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS1-1 and condition WUS1-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS1-3 or condition WUS1-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS1-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS1-2 (Entering condition 2)∀Mn + Ofn + Ocn + Hys < Thresh2Inequality WUS1-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS1-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys > Thresh2The variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.∀Mnis the measurement result of all the neighbouring cells, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Msare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMs.Thresh2is expressed in the same unit asMn.

[0105] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS1-1 and condition WUS1-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS1-3 or condition WUS1-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS1-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS1-2 (Entering condition 2)BMn + Ofn + Ocn + Hys < Thresh2Inequality WUS1-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS1-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys > Thresh2The variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.BMnis the measurement result of the best neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Msare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMs.Thresh2is expressed in the same unit asMn.

[0106] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS1-1 and condition WUS1-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS1-3 or condition WUS1-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS1-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS1-2 (Entering condition 2)There is NO neighbouring cell detectedInequality WUS1-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS1-4 (Leaving condition 2)There is at least one neighbouring cell detectedThe variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Hysis the hysteresis parameter for this event (iehysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (iea5-Threshold1as defined withinreportConfigNRfor this event).Mnis expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Hysis expressed in dB.Thresh1is expressed in the same unit asMs.

[0107] 8. Event WUS2(Serving becomes worse than threshold1 and neighbor cells becomes worse than threshold2)

[0108] When a terminal attempts to measure within a serving cell and measurement frequency bands set by a base station or within a list of neighboring cells for measurement set by a base station, and the measurement value of the serving cell is less than a threshold value 1 set by the base station and the measurement values ​​of neighboring cells are less than a threshold value 2 set by the base station, the terminal may trigger the transmission of a WUS to wake up a neighboring cell operating in sleep mode to find a better neighboring cell. For example, the operation of the terminal may be defined as in Tables 13 and 14 below.

[0109] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS2-1 and condition WUS2-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS2-3 or condition WUS2-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS2-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS2-2 (Entering condition 2)∀Mn + Ofn + Ocn + Hys < Thresh2Inequality WUS2-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS2-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys > Thresh2The variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.∀Mnis the measurement result of all the neighbouring cells, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Msare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMs.Thresh2is expressed in the same unit asMn.

[0110] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS-1 and condition WUS-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS-3 or condition WUS-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS-2 (Entering condition 2)BMn + Ofn + Ocn + Hys < Thresh2Inequality WUS-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys > Thresh2The variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.BMnis the measurement result of the best neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Msare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMs. Thresh2is expressed in the same unit asMn.

[0111] 9. Event WUS3(Serving becomes worse than threshold1 and neighbor cells becomes better than threshold2)

[0112] When a terminal attempts to measure within a serving cell and measurement frequency bands set by a base station or within a list of neighboring cells for measurement set by a base station, and the measurement value of the serving cell is less than a threshold value 1 set by the base station and the measurement values ​​of neighboring cells are greater than a threshold value 2 set by the base station, the terminal may trigger the transmission of a WUS to wake up a neighboring cell operating in sleep mode to find a better neighboring cell. For example, the operation of the terminal may be defined as in Tables 15 and 16 below.

[0113] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS3-1 and condition WUS3-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS3-3 or condition WUS3-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS3-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS3-2 (Entering condition 2)∀Mn + Ofn + Ocn + Hys > Thresh2Inequality WUS3-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS3-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys < Thresh2The variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.∀Mnis the measurement result of all the neighbouring cells, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Msare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMs.Thresh2is expressed in the same unit asMn.

[0114] The UE may:1> consider the entering condition for this event to be satisfied when both condition WUS-1 and condition WUS-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition WUS-3 or condition WUS-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE 1: The parameters of the reference signal(s) of the cell(s) that triggers the event are indicated in themeasObjectNRassociated to the event which may be different from themeasObjectNRof the NR SpCell.Inequality WUS-1 (Entering condition 1)Ms + Hys < Thresh1Inequality WUS-2 (Entering condition 2)WMn + Ofn + Ocn + Hys > Thresh2Inequality WUS-3 (Leaving condition 1)Ms - Hys > Thresh1Inequality WUS-4 (Leaving condition 2)Mn + Ofn + Ocn + Hys < Thresh2The variables in the formula are defined as follows:Msis the measurement result of the Serving cell, not taking into account any offsets.Mnis the measurement result of the neighbouring cell, not taking into account any offsets.WMnis the measurement result of the worst neighbouring cell, not taking into account any offsets.Ofnis the measurement object specific offset of the neighbour cell (i.e.offsetMOas defined withinmeasObjectNRcorresponding to the neighbour cell).Ocnis the cell specific offset of the neighbour cell (i.e.cellIndividualOffsetas defined withinmeasObjectNRcorresponding to the neighbour cell), and set to zero if not configured for the neighbour cell.Hysis the hysteresis parameter for this event (i.e.hysteresisas defined withinreportConfigNRfor this event).Thresh1is the threshold parameter for this event (i.e.a5-Threshold1as defined withinreportConfigNRfor this event).Thresh2is the threshold parameter for this event (i.e.a5-Threshold2as defined withinreportConfigNRfor this event).Mn, Msare expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.Ofn, Ocn, Hysare expressed in dB.Thresh1is expressed in the same unit asMs. Thresh2is expressed in the same unit asMn.

[0115] In the above examples, inequalities can be interchanged with inequalities including equal signs.

[0116] For example, the case of greater than can be replaced with the case of greater than or equal to, and the case of less than can be replaced with the case of less than or equal to.

[0117] The above neighboring cell can be replaced with a candidate cell.

[0118] Alternatively, in one embodiment, the terminal may receive an information element (IE), for example, s-WusTriggerConfig, configured as shown in Table 17, that triggers WUS by comparing the measured value of any reference signal for the serving cell with any threshold set by the serving cell.

[0119] MeasConfig ::= SEQUENCE {measObjectToRemoveList MeasObjectToRemoveList OPTIONAL, -- Need NmeasObjectToAddModList MeasObjectToAddModList OPTIONAL, -- Need NreportConfigToRemoveList ReportConfigToRemoveList OPTIONAL, -- Need NreportConfigToAddModList ReportConfigToAddModList OPTIONAL, -- Need NmeasIdToRemoveList MeasIdToRemoveList OPTIONAL, -- Need NmeasIdToAddModList MeasIdToAddModList OPTIONAL, -- Need Ns-MeasureConfig CHOICE {ssb-RSRP RSRP-Range,csi-RSRP RSRP-Range} OPTIONAL, -- Need Ms-WusTriggerConfig CHOICE {serving-ssb-RSRP RSRP-Range,serving-csi-RSRP RSRP-Range} OPTIONAL, -- Need M<omitted>}

[0120] In one embodiment, a terminal that has s-WusTriggerConfig set as in Table 17 above can perform operations as in Table 18 below.

[0121] The UE may:1> if the receivedmeasConfigincludes thes-WusTriggerConfig:2> ifs-WusTriggerConfigis set toserving-ssb-RSRP, set parameterserving-ssb-RSRPofs-WusTriggerConfigwithinVarMeasConfigto the threshold value of the RSRP indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2;2> else, set parameterserving-csi-RSRPofs-WusTriggerConfigwithinVarMeasConfigto the threshold value of the RSRP indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2.The UE may:1> for eachmeasIdincluded in themeasIdListwithinVarMeasConfig:2> if thereportTypefor the associatedreportConfigisperiodical,eventTriggered; or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig,themeasIdis within the MCGmeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the MCGVarConditionalReconfig(for CHO, CPA or MN-initiated inter-SN CPC in NR-DC);or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the SCGVarConditionalReconfig(for intra-SN CPC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondSCGassociated to acondReconfigIdin the MCGVarConditionalReconfig(for SN-initiated inter-SN CPC in NR-DC);or2> if thereportTypefor the associatedreportConfigisndTriggerConfig, themesIdis within the SCGVarMeasConfigand is indicated in thetriggerConditionSNassociated to acondReconfigurationIdinVarConditionalReconfigurationas specified in TS 36.331

[0010] (for SN-initiated inter-SN CPC in EN-DC):3> if a measurement gap configuration is setup, or3> if the UE does not require measurement gaps to perform the concerned measurements:4> ifs-WusTriggerConfigis not configured, or4> ifs-WusTriggerConfigis set tossb-RSRPand the NR SpCell RSRP based on SS / PBCH block, after layer 3 filtering, is lower than serving-ssb-RSRP,or4> ifs-WusTriggerConfigis set tocsi-RSRPand the NR SpCell RSRP based on CSI-RS, after layer 3 filtering, is lower thanserving-csi-RSRP,5> Trigger Wus Transmission;

[0122] Alternatively, in one embodiment, the terminal may receive an information element (IE), for example, s-WusTriggerConfig, configured as shown in Table 19, that triggers WUS if the measured value of any reference signal for the serving cell and the adjacent cell is lower than any threshold set by the serving cell.

[0123] MeasConfig ::= SEQUENCE {measObjectToRemoveList MeasObjectToRemoveList OPTIONAL, -- Need NmeasObjectToAddModList MeasObjectToAddModList OPTIONAL, -- Need NreportConfigToRemoveList ReportConfigToRemoveList OPTIONAL, -- Need NreportConfigToAddModList ReportConfigToAddModList OPTIONAL, -- Need NmeasIdToRemoveList MeasIdToRemoveList OPTIONAL, -- Need NmeasIdToAddModList MeasIdToAddModList OPTIONAL, -- Need Ns-MeasureConfig CHOICE {ssb-RSRP RSRP-Range,csi-RSRP RSRP-Range} OPTIONAL, -- Need Ms-WusTriggerConfig CHOICE {ssb-RSRPs SEQUENCE {serving-ssb-RSRP RSRP-Range,neighbour-ssb-RSRP RSRP-Range,}csi-RSRPs SEQUENCE {serving-csi-RSRP RSRP-Range,neighbour-csi-RSRP RSRP-Range}} OPTIONAL, -- Need M<omitted>}

[0124] In one embodiment, a terminal that has s-WusTriggerConfig set as in Table 19 above can perform operations as in Table 20 below.

[0125] The UE may:1> if the receivedmeasConfigincludes thes-WusTriggerConfig:2> ifs-WusTriggerConfigis set tossb-RSRPs, set parameterserving-ssb-RSRPandneighbour-ssb-RSRPofs-WusTriggerConfigwithinVarMeasConfigto the threshold values of the RSRPs indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2;2> else, set parameters ofcsi-RSRPsofs-WusTriggerConfigwithinVarMeasConfigto the threshold values of the RSRP indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2.The UE may:1> for eachmeasIdincluded in themeasIdListwithinVarMeasConfig:2> if thereportTypefor the associatedreportConfigisperiodical,eventTriggered; or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig,themeasIdis within the MCGmeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the MCGVarConditionalReconfig(for CHO,CPA or MN-initiated inter-SN CPC in NR-DC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the SCGVarConditionalReconfig(for intra-SN CPC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondSCGassociated to acondReconfigIdin the MCGVarConditionalReconfig(for SN-initiated inter-SN CPC in NR-DC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thetriggerConditionSNassociated to acondReconfigurationIdinVarConditionalReconfigurationas specified in TS 36.331

[0010] (for SN-initiated inter-SN CPC in EN-DC):3> if a measurement gap configuration is setup,or3> if the UE does not require measurement gaps to perform the concerned measurements:4> ifs-WusTriggerConfigis not configured, or4> ifs-WusTriggerConfigis set to serving-ssb-RSRPand the NR SpCell RSRP based on SS / PBCH block, after layer 3 filtering, is lower than serving-ssb-RSRPand the NR neighbor cell RSRP based on SS / PBCH block, after layer 3 filtering, is lower thanneighbour-ssb-RSRP,or4> ifs-WusTriggerConfigis set tocsi-RSRPsand the NR SpCell RSRP based on CSI-RS, after layer 3 filtering, is lower thanserving-csi-RSRPand the NR neighbor cell RSRP based on CSI-RS, after layer 3 filtering, is lower thanneighbour- csi -RSRP,5> Trigger Wus Transmission,

[0126] Alternatively, in one embodiment, the terminal may receive an information element (IE), for example, s-WusTriggerConfig, configured as shown in Table 21, that triggers WUS if the measured value of any reference signal for the serving cell and the adjacent cell is lower than any threshold set by the serving cell.

[0127] MeasConfig ::= SEQUENCE {measObjectToRemoveList MeasObjectToRemoveList OPTIONAL, -- Need NmeasObjectToAddModList MeasObjectToAddModList OPTIONAL, -- Need NreportConfigToRemoveList ReportConfigToRemoveList OPTIONAL, -- Need NreportConfigToAddModList ReportConfigToAddModList OPTIONAL, -- Need NmeasIdToRemoveList MeasIdToRemoveList OPTIONAL, -- Need NmeasIdToAddModList MeasIdToAddModList OPTIONAL, -- Need Ns-MeasureConfig CHOICE {ssb-RSRP RSRP-Range,csi-RSRP RSRP-Range} OPTIONAL, -- Need Ms-WusTriggerConfig CHOICE {ssb-RSRP RSRP-Range,csi-RSRP RSRP-Range} OPTIONAL, -- Need M<omitted>}

[0128] In one embodiment, a terminal that has s-WusTriggerConfig set as in Table 21 above can perform operations as in Table 22 below.

[0129] The UE may:1> if the receivedmeasConfigincludes thes-WusTriggerConfig:2> ifs-WusTriggerConfigis set tossb-RSRP, set parameterssb-RSRPofs-WusTriggerConfigwithinVarMeasConfigto the threshold values of the RSRPs indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2;2> else, set parameters ofcsi-RSRPofs-WusTriggerConfigwithinVarMeasConfigto the threshold values of the RSRP indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2.The UE may:1> for eachmeasIdincluded in themeasIdListwithinVarMeasConfig:2> if thereportTypefor the associatedreportConfigisperiodical,eventTriggered; or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig,themeasIdis within the MCGmeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the MCGVarConditionalReconfig(for CHO, CPA or MN-initiated inter-SN CPC in NR-DC);or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the SCGVarConditionalReconfig(for intra-SN CPC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondSCGassociated to acondReconfigIdin the MCGVarConditionalReconfig(for SN-initiated inter-SN CPC in NR-DC);or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thetriggerConditionSNassociated to acondReconfigurationIdinVarConditionalReconfigurationas specified in TS 36.331

[0010] (for SN-initiated inter-SN CPC in EN-DC):3> if a measurement gap configuration is setup, or3> if the UE does not require measurement gaps to perform the concerned measurements:4> ifs-WusTriggerConfigis not configured, or4> ifs-WusTriggerConfigis set tossb-RSRPand the NR SpCell RSRP based on SS / PBCH block, after layer 3 filtering, is lower thanssb-RSRPand the NR neighbour cell RSRP based on SS / PBCH block, after layer 3 filtering, is lower thanssb-RSRP,or4> ifs-WusTriggerConfigis set tocsi-RSRPand the NR SpCell RSRP based on CSI-RS, after layer 3 filtering, is lower thancsi-RSRPand the NR neighbour cell RSRP based on CSI-RS, after layer 3 filtering, is lower thancsi -RSRP,5> Trigger Wus Transmission;

[0130] Alternatively, in one embodiment, the terminal may receive an information element (IE), for example, s-WusTriggerConfig, configured as shown in Table 23, that triggers WUS if the measured value of any reference signal for the serving cell and the adjacent cell is lower than any threshold set by the serving cell.

[0131] MeasConfig ::= SEQUENCE {measObjectToRemoveList MeasObjectToRemoveList OPTIONAL, -- Need NmeasObjectToAddModList MeasObjectToAddModList OPTIONAL, -- Need NreportConfigToRemoveList ReportConfigToRemoveList OPTIONAL, -- Need NreportConfigToAddModList ReportConfigToAddModList OPTIONAL, -- Need NmeasIdToRemoveList MeasIdToRemoveList OPTIONAL, -- Need NmeasIdToAddModList MeasIdToAddModList OPTIONAL, -- Need Ns-MeasureConfig CHOICE {ssb-RSRP RSRP-Range,csi-RSRP RSRP-Range} OPTIONAL, -- Need Ms-WusTriggerConfig CHOICE {ssb-RSRPs SEQUENCE {serving-ssb-RSRP RSRP-Range,neighbour-ssb-RSRP RSRP-Range,}csi-RSRPs SEQUENCE {serving-csi-RSRP RSRP-Range,neighbour-csi-RSRP RSRP-Range}} OPTIONAL, -- Need M<omitted>}

[0132] In one embodiment, a terminal that has s-WusTriggerConfig set as in Table 23 above can perform operations as in Table 24 below.

[0133] The UE may:1> if the receivedmeasConfigincludes thes-WusTriggerConfig:2> ifs-WusTriggerConfigis set tossb-RSRPs, set parameterserving-ssb-RSRPandneighbour-ssb-RSRPofs-WusTriggerConfigwithinVarMeasConfigto the threshold values of the RSRPs indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2;2> else, set parameters ofcsi-RSRPsofs-WusTriggerConfigwithinVarMeasConfigto the threshold values of the RSRP indicated by the received value ofs-WusTriggerConfigwhich is derived as specified in 6.3.2.The UE may:1> for eachmeasIdincluded in themeasIdListwithinVarMeasConfig:2> if thereportTypefor the associatedreportConfigisperiodical,eventTriggered; or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig,themeasIdis within the MCGmeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the MCGVarConditionalReconfig(for CHO,CPA or MN-initiated inter-SN CPC in NR-DC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondassociated to acondReconfigIdin the SCGVarConditionalReconfig(for intra-SN CPC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thecondExecutionCondSCGassociated to acondReconfigIdin the MCGVarConditionalReconfig(for SN-initiated inter-SN CPC in NR-DC); or2> if thereportTypefor the associatedreportConfigiscondTriggerConfig, themeasIdis within the SCGVarMeasConfigand is indicated in thetriggerConditionSNassociated to acondReconfigurationIdinVarConditionalReconfigurationas specified in TS 36.331

[0010] (for SN-initiated inter-SN CPC in EN-DC):3> if a measurement gap configuration is setup,or3> if the UE does not require measurement gaps to perform the concerned measurements:4> ifs-WusTriggerConfigis not configured, or4> ifs-WusTriggerConfigis set to serving-ssb-RSRPand the NR SpCell RSRP based on SS / PBCH block, after layer 3 filtering, is lower than serving-ssb-RSRPand the NR neighbor cell RSRP based on SS / PBCH block, after layer 3 filtering, is higher thanneighbour-ssb-RSRP,or4> ifs-WusTriggerConfigis set tocsi-RSRPsand the NR SpCell RSRP based on CSI-RS, after layer 3 filtering, is lower thanserving-csi-RSRPand the NR neighbor cell RSRP based on CSI-RS, after layer 3 filtering, is higher thanneighbour-csi -RSRP,5> Trigger Wus Transmission,

[0134] The configuration information, including the above trigger conditions, indicators, thresholds, etc., may be a unicast message transmitted to a specific terminal, or a broadcast message transmitted to an unspecified number of terminals. The configuration information may be an RRC message, a MAC message including a MAC CE, or a DCI message of the PHY layer.

[0135] In one embodiment, the trigger condition may be configured to have different threshold values ​​for different specific cells. For example, the trigger condition may be a list of trigger conditions configured with different Events and / or different threshold values ​​for multiple cells, with one element being a trigger condition based on a measurement value of the cell, the trigger condition having elements including an ID of the specific cell, one or more Events corresponding to the ID, and one or more threshold values. For example, the list of trigger conditions may be defined as in Table 25 below.

[0136] WusTriggerConditions:Listof {Condition ID; indicates the id among WUS Trigger Conditions,Cell ID (or list of Cell IDs); indicates the cell(s) for this condition,Condition events (or list of events); indicates events such as A2, A3, … for the cells to trigger WUS tx.}

[0137] In one embodiment, the trigger condition may be configured to have different thresholds for different specific cells and to transmit WUS to specific cells. For example, the trigger condition may be a trigger condition based on a measurement value of a specific cell, which has an element composed of an ID of the specific cell, one or more Events corresponding to the ID, and one or more thresholds, and a list of trigger conditions configured with different Events and / or different thresholds for multiple cells, with each element being a target cell to which WUS is to be transmitted. For example, the list of trigger conditions may be defined as in Table 26 below.

[0138] WusTriggerConditions:Listof {Condition ID; indicates the id among WUS Trigger Conditions,Trigger Cell ID (or list of Cell IDs); indicates the cell(s) for this condition to trigger WUS tx.,Condition events (or list of events); indicates events such as A2, A3, … for the cells to trigger WUS tx.Candidate Cell ID (or list of Cell IDs); indicates the cell(s) for transmitting WUS to them,}

[0139] In one embodiment, a terminal that has received a trigger for WUS transmission from a base station may measure a reference signal of a serving cell and / or a neighboring cell as set, and compare the reference signal with a set threshold value to determine whether the set trigger condition is satisfied. In steps 3-15, if the trigger condition is satisfied, the terminal may transmit WUS to a specific or unspecified neighboring cell.

[0140] The resource information for the above WUS transmission may have been provided to the terminal from the base station via a signal (e.g., a broadcast signal or an RRC signal) before the trigger condition setting information for the WUS transmission was received. Alternatively, the resource information for the WUS transmission may be included in a single signal (e.g., an RRC signal) together with the trigger condition setting signal for the WUS transmission.

[0141] In step 3-20, the adjacent cell that received the WUS transmitted by the terminal can exit the sleep mode by determining the following conditions if it is operating in the sleep mode. (For example, if it is in the deep sleep mode, the main radio (MR) can be woken up, and if it is in the light sleep mode, SSB / SIB transmission can be started.)

[0142] - You can wake up (unconditionally) when you receive WUS.

[0143] - WUS can wake up when the received power exceeds a certain threshold.

[0144] - WUS can wake up when the received power exceeds a certain threshold set by any entity (e.g. AMF, etc.) in the network (e.g. core network).

[0145] - WUS can wake up when the received power exceeds a certain threshold provided by the neighboring cell.

[0146] In step 3-25, the MR of the woke-up adjacent cell can transmit a synchronization signal block (SSB).

[0147] FIG. 4 is a diagram illustrating a method for limiting WUS repetitive transmission using a timer according to one embodiment of the present disclosure.

[0148] According to FIG. 4, a serving cell may set a timer (e.g., WusProhibitTimer) to prevent WUS transmissions to a terminal in order to prevent repeated WUS transmissions within a short period of time and to reduce unnecessary power consumption of the terminal and base station. The signal may be an RRC signal, a MAC signal, or a PHY signal. The drawing illustrates WusProhibitTimer set as an RRC signal as an example.

[0149] A terminal with the Timer set can perform some or all of the following actions in relation to WUS transmission.

[0150] - The terminal can transmit WUS signal to neighboring cell(s) and start WusProhibitTimer.

[0151] - The terminal can start WusProhibitTimer by sending a WUS signal if the current WusProhibitTimer has expired.

[0152] - The terminal may not trigger WUS signal transmission if the current WusProhibitTimer has not expired.

[0153] - The terminal may not perform WUS signal transmission even if WUS signal transmission is triggered if the current WusProhibitTimer has not expired.

[0154] - The terminal can restart WusProhibitTimer if WUS is triggered again while WusProhibitTimer has not expired yet.

[0155] - The starting point of the WusProhibitTimer may be one of the following: the start point of WUS signal transmission by the terminal, the end point of WUS signal transmission by the terminal, the trigger trigger for WUS signal transmission by the terminal, or the time points specified above plus any time offset (e.g., number of slots) set by the base station.

[0156] In one embodiment, the WusProhibitTimer may be included in the WUS trigger condition specified in FIG. 3, so that the WUS is triggered only when the WusProhibitTimer has expired or the Timer is not running.

[0157] For example, the above Event X (where X is one of the WUS trigger conditions specified in the above Figure 3, such as A2, A3, A4, WUS1, or s-Measure) may be changed to 'Event X + WusProhibitTimer expires'.

[0158] FIG. 5 is a diagram illustrating a method for repeating WUS transmission of a terminal according to cell settings according to an embodiment of the present disclosure.

[0159] According to FIG. 5, the serving cell may allow regular and repetitive WUS transmissions to the terminal as needed to increase the success rate of WUS transmissions or to improve the coverage that WUS transmissions can reach.

[0160] To this end, the base station can set a WUS transmission pattern for the terminal. The signal may be an RRC signal, a MAC signal, or a PHY signal. The drawing illustrates, as an example, a WUS transmission pattern including three repeated transmissions with the same period set by an RRC signal.

[0161] The terminal may receive from the base station a series of patterns having some or all of the following configurations in relation to WUS transmission.

[0162] - The base station can set the number of WUS retransmissions or the total number of WUS transmissions.

[0163] - The base station can set the period between each WUS transmission.

[0164] - The base station can set a list of target cells to transmit WUS.

[0165] - The base station can configure the terminal to start the WusProhibitTimer when (or immediately after) the last WUS transmission.

[0166] - The base station can be configured to start the WusProhibitTimer when the terminal first transmits WUS (or immediately after transmission).

[0167] - The starting point of the WusProhibitTimer may be one of the following: the start point of WUS signal transmission by the terminal, the end point of WUS signal transmission by the terminal, the trigger trigger for WUS signal transmission by the terminal, or the time points specified above plus any time offset (e.g., number of slots) set by the base station.

[0168] In one embodiment, the WusProhibitTimer may be included in the WUS trigger condition specified in FIG. 3, so that the WUS is triggered only when the WusProhibitTimer has expired or the Timer is not running.

[0169] For example, the above Event X (where X is one of the WUS trigger conditions specified in the above Figure 3, such as A2, A3, A4, WUS1, or s-Measure) may be changed to 'Event X + WusProhibitTimer Expired'.

[0170] In one embodiment, the base station may configure (or instruct) the terminal to transmit WUS only when the base station permits.

[0171] For example, a base station may transmit a signal including an indication allowing a terminal to transmit WUS (or not allowing it to transmit), and the terminal may transmit WUS only if the base station allows it.

[0172] The 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 a system information block (SIB). Alternatively, the signal may be included in a unicast signal transmitted by the base station specifically to the terminal, for example, an RRC signal, a MAC signal, or a PHY signal.

[0173] The above signal may also be transmitted by the base station to the terminal, including a list of neighboring cells to which the base station can transmit WUS.

[0174] The base station that received the WUS can exit sleep mode if it is operating in sleep mode by determining the following conditions. (For example, if it is in deep sleep mode, it can wake up the main radio (MR), and if it is in light sleep mode, it can start SSB / SIB transmission.) The base station can transmit broadcast signals such as SSB and SIB while waiting for the terminal to connect. However, if the terminal does not connect for a certain period of time, the base station may need to return to sleep mode to save power.

[0175] To do this, the base station can return to Sleep mode according to the Timer based on any SleepTimer value.

[0176] The SleepTimer can be set by the base station from any entity in the upper core network (e.g. AMF, SMF, MME, etc.).

[0177] The SleepTimer can perform some or all of the following functions:

[0178] - Base station SleepTimer can start from the time the base station receives WUS.

[0179] - Base station SleepTimer can start from the time the base station receives WUS.

[0180] - When the SleepTimer expires, the base station can return to Sleep mode, for example, Deep Sleep mode, and perform power saving actions.

[0181] FIG. 6 is a diagram illustrating a signaling procedure for setting a timer between cells according to one embodiment of the present disclosure.

[0182] According to Figure 6, a serving cell can exchange SleepTimer information with adjacent cell(s). Depending on the capabilities and implementation of each cell and base station, the SleepTimer of each cell may have different values. Accordingly, a serving cell can collect SleepTimer information from adjacent cells and provide the SleepTimer information of the serving cell to the adjacent cells.

[0183] To this end, in step 6-05, the serving cell may transmit an inter-node message requesting SleepTimer information to neighboring cells, and in response, may receive an inter-node message including SleepTimer information.

[0184] In another embodiment, the serving cell and neighboring cells may forward inter-node messages containing SleepTimer to neighboring cells upon cell installation or when SleepTimer is changed.

[0185] In steps 6-10, the serving cell that has collected SleepTimer information from neighboring cells can select and decide on a specific WusProhibitTimer.

[0186] - For example, the serving cell can determine a WusProhibitTimer with a value less than or equal to all collected SleepTimers. This allows the terminal to retransmit WUS before any neighboring cell goes to sleep again if WUS is triggered continuously.

[0187] In steps 6-15, the serving cell can transmit a signal to the terminal to set the determined WusProhibitTimer so that the terminal does not perform unnecessary WUS signal retransmission within the WusProhibitTimer.

[0188] FIG. 7 is a diagram illustrating a signaling procedure for reactivating a sleep mode of an adjacent cell according to an embodiment of the present disclosure.

[0189] According to FIG. 7, when a neighboring cell receives a WUS transmitted by a terminal and comes out of sleep mode (e.g., if it is in deep sleep mode, it can wake up the main radio (MR), and if it is in light sleep mode, it can start SSB / SIB transmission), it shows a method in which a serving cell can transmit a signal between nodes to switch it back to sleep mode.

[0190] In step 7-05, the terminal can transmit a WUS signal to a neighboring cell. In step 7-10, the neighboring cell that receives the WUS signal transmitted by the terminal can wake up and prepare for SSB transmission and various signal transmission and reception.

[0191] In steps 7-15, the serving cell may decide, based on various judgments, whether to transmit a message (e.g., a BackToSleep message) to enable the neighboring cell to return to Sleep Mode when it wakes up due to the WUS of the specific terminal.

[0192] - The serving cell may decide to transmit a BackToSleep message to other adjacent cells when the handover is successful and the terminal performs a handover to the serving cell.

[0193] - The serving cell can determine whether to transmit a BackToSleep message to adjacent cells by judging the uplink or downlink channel status (RSRP, RSRQ, CQI, etc.) of the corresponding terminal and, if the channel status is good beyond a certain threshold,

[0194] - The serving cell can determine the mobility of the terminal and, if the terminal is in a low mobility state, decide to transmit a BackToSleep message to other adjacent cells.

[0195] - The serving cell can determine whether the terminal is located on the cell edge and, if the terminal is not at the cell edge (not-at-cell-edge), decide to transmit a BackToSleep message to other adjacent cells.

[0196] - The serving cell may consider one or more of the above-described judgment conditions and decide to transmit a BackToSleep message to other adjacent cells if various conditions are satisfied.

[0197] The above low mobility conditions can be determined as shown in Table 27 below:

[0198] The relaxed measurement criterion for UE with low mobility is fulfilled when:- (Srxlev Ref - Srxlev) < S SearchDeltaP ,Where:- Srxlev = current Srxlev value of the serving cell (dB).- Srxlev Ref= reference Srxlev value of the serving cell (dB), set as follows:- After selecting or reselecting a new cell, or- If (Srxlev - Srxlev Ref ) > 0, or- If the relaxed measurement criterion has not been met for T SearchDeltaP :- The UE may set the value of Srxlev Ref to the current Srxlev value of the serving cell.

[0199] The above not-at-cell-edge condition can be determined as shown in Table 28 below:

[0200] The relaxed measurement criterion for UE not at cell edge is fulfilled when:- Srxlev > S SearchThresholdP , and,- Squal > S SearchThresholdQ , if S SearchThresholdQ is configured,Where:- Srxlev = current Srxlev value of the serving cell (dB).- Squal = current Squal value of the serving cell (dB).

[0201] According to one embodiment of the present disclosure, the received signal strength and the signal strength threshold may be replaced with the distance and the distance threshold between the base station and the terminal, respectively.

[0202] If the above condition(s) are satisfied, in steps 7-15, the serving cell can transmit a BackToSleep message as an inter-node message to neighboring cells.

[0203] In addition, the serving cell may transmit a BackToSleep message as an inter-node message to neighboring cells if any condition determined to be necessary by the terminal that transmitted the WUS is satisfied.

[0204] The above BackToSleep message may contain all or part of the following information:

[0205] - Sequence ID of WUS

[0206] - Time of receiving WUS

[0207] - Any temporary ID calculated from the time the WUS was received

[0208] - ID of the terminal that transmitted WUS

[0209] - Part of the ID of the terminal that transmitted the WUS

[0210] - Purpose ID that can identify the purpose of WUS

[0211] - Uplink channel quality of the terminal (RSRP, RSRQ, CQI, etc.)

[0212] - Downlink channel quality of the terminal (RSRP, RSRQ, CQI, etc.)

[0213] - An indicator that allows the base station to return to sleep mode.

[0214] The above inter-node message may be a message that can be transmitted and received between base stations, within a base station, between DUs, within DUs, between CUs, and / or within CUs via a wired network such as X2.

[0215] In step 7-25, the cell that received the above inter-node message may return to sleep mode to save power if it determines that there is a power saving benefit by considering one or more conditions, such as whether there is a terminal within the cell, whether there is another WUS received from another adjacent terminal, and whether the SleepTimer has expired.

[0216] FIG. 8 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0217] Referring to Fig. 8, the base station may include a transceiver (8-05), a control unit (8-10), and a storage unit (8-15). The transceiver (8-05), the control unit (8-10), and the storage unit (8-15) may operate according to the communication method of the base station described above. In addition, the 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 (8-05) and a control unit (8-10). In addition, the transceiver (8-05), the control unit (8-10), and the storage unit (8-15) may be implemented in the form of a single chip.

[0218] The transceiver (8-05) 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 (8-05) may, for example, transmit system information to the terminal, and transmit a synchronization signal or a reference signal. To this end, the transceiver (8-05) 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-downconverts a received signal. However, this is only one embodiment of the transceiver (8-05), and the components of the transceiver (8-05) are not limited to the RF transmitter and RF receiver. The transceiver (8-05) may include wired and wireless transceivers, and may include various configurations for transmitting and receiving signals. In addition, the transceiver (8-05) can receive a signal through a communication channel (e.g., a wireless channel) and output it to the control unit (8-10), and transmit the signal output from the control unit (8-10) through the communication channel. In addition, the transceiver (8-05) 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.

[0219] The storage unit (8-15) can store programs and data required for the operation of the base station. In addition, the storage unit (8-15) can store control information or data included in a signal acquired from the base station. The storage unit (8-15) 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 (8-15) can store at least one of information transmitted and received through the transceiver unit (8-05) and information generated through the control unit (8-10).

[0220] In the present disclosure, the control unit (8-10) may be defined as a circuit or application-specific integrated circuit, or at least one processor. The processor 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 (8-10) may control the overall operation of the base station according to the embodiment proposed in the present disclosure. For example, the control unit (8-10) may control the signal flow between each block to perform operations according to the flowchart described above.

[0221] FIG. 9 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.

[0222] Referring to FIG. 9, the terminal may include a transceiver (9-05), a control unit (9-10), and a storage unit (9-15). The transceiver (9-05), the control unit (9-10), and the storage unit (9-15) 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 may include more or fewer components than the components described above. For example, the terminal may include a transceiver (9-05) and a control unit (9-10). In addition, the transceiver (9-05), the control unit (9-10), and the storage unit (9-15) may be implemented in the form of a single chip.

[0223] The transceiver (9-05) is a general term for the receiver and transmitter of the 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 (9-05) may, for example, receive system information from the base station and receive a synchronization signal or a reference signal. To this end, the transceiver (9-05) 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-downconverts the received signal. However, this is only one embodiment of the transceiver (9-05), and the components of the transceiver (9-05) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (9-05) may include a wired or wireless transceiver (9-05), and may include various configurations for transmitting and receiving signals. In addition, the transceiver (9-05) can receive a signal through a wireless channel and output it to the control unit (9-10), and transmit the signal output from the control unit (9-10) through the wireless channel. In addition, the transceiver (9-05) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to a network entity through a wired or wireless network.

[0224] The storage unit (9-15) can store programs and data necessary for the operation of the terminal. Furthermore, the memory can store control information or data included in signals acquired from the terminal. The storage unit (9-15) can be configured as a storage medium, such as a ROM, RAM, hard disk, CD-ROM, or DVD, or a combination of storage media.

[0225] In the present disclosure, the control unit (9-10) may be defined as a circuit or application-specific integrated circuit, or at least one processor. The processor 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 (9-10) may control the overall operation of the terminal according to the embodiment proposed in the present disclosure. For example, the control unit (9-10) may control the signal flow between each block to perform operations according to the flowchart described above.

[0226] 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.

[0227] 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.

[0228] These programs (software modules, software) may be stored in a non-volatile memory including random access memory, flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage devices, compact disc ROMs (CD-ROMs), digital versatile discs (DVDs) or other forms of optical storage devices, magnetic cassettes, or may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may include multiple copies.

[0229] 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.

[0230] 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. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0231] 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.

Claims

1. In a method of operating a terminal in a wireless communication system, A step of receiving first configuration information for transmitting a wake up signal (WUS) from a serving cell and second configuration information for a timer for preventing WUS transmission; A step of determining whether the conditions for WUS transmission are satisfied based on the first setting information; and A method comprising: a step of transmitting a first WUS to an adjacent cell and starting the timer if the above condition is satisfied; 2. In paragraph 1, A method further comprising the step of receiving a synchronization signal block (SSB) from the adjacent cell.

3. In paragraph 1, A method further comprising the step of determining not to trigger transmission of the second WUS if the above timer is running.

4. In paragraph 1, A method further comprising the step of determining not to transmit the second WUS if the timer is running when transmission of the second WUS is triggered.

5. In paragraph 1, A method further comprising the step of restarting the timer if the timer is running when transmission of the second WUS is triggered.

6. In paragraph 1, The starting point of the above timer is, A method, characterized in that the time point is any one of the time point at which the transmission of the first WUS of the terminal starts, the time point at which the transmission of the first WUS of the terminal ends, or the time point at which the transmission of the first WUS of the terminal is triggered.

7. In paragraph 1, The starting point of the above timer is, A method characterized in that the time offset set from the base station is added to any one of the time at which the transmission of the first WUS of the terminal starts, the time at which the transmission of the first WUS of the terminal ends, or the time at which the transmission of the first WUS of the terminal is triggered.

8. In paragraph 7, A method, characterized in that the above time offset is set based on the number of slots.

9. In a terminal in a wireless communication system, Transmitter and receiver; and At least one control unit coupled to the above transceiver unit, At least one of the above control units, Receive first configuration information for transmitting a wake up signal (WUS) from a serving cell and second configuration information for a timer for preventing WUS transmission, Based on the above first setting information, it is determined whether the conditions for the WUS transmission are satisfied, A terminal that transmits a first WUS to an adjacent cell and starts the timer when the above condition is satisfied.

10. In paragraph 9, At least one of the above control units, A terminal that receives a synchronization signal block (SSB) from the adjacent cell.

11. In paragraph 9, At least one of the above control units, A terminal that decides not to trigger transmission of the second WUS while the above timer is running.

12. In paragraph 9, At least one of the above control units, A terminal which decides not to transmit the second WUS if the timer is running when transmission of the second WUS is triggered.

13. In paragraph 9, At least one of the above control units, A terminal that restarts the timer if the timer is running when the transmission of the second WUS is triggered.

14. In paragraph 9, The starting point of the above timer is, A terminal, characterized in that the time point is any one of the time point at which the transmission of the first WUS of the terminal starts, the time point at which the transmission of the first WUS of the terminal ends, or the time point at which the transmission of the first WUS of the terminal is triggered.

15. In paragraph 9, The starting point of the above timer is, It is characterized in that the value is obtained by adding a time offset set from the base station to any one of the time at which the transmission of the first WUS of the terminal starts, the time at which the transmission of the first WUS of the terminal ends, or the time at which the transmission of the first WUS of the terminal is triggered. A terminal, characterized in that the above time offset is set based on the number of slots.

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