Method and device for transmitting and receiving wake-up signal using low-power wake-up radio for next-generation energy-efficient mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure relates to a method and a device performing same, the method comprising: an operation in which a terminal transmits a reference signal to adjacent cells and base stations through a wake-up radio (WUR) and a new radio (NR) according to a certain condition, receives a signal including a certain trigger condition from a base station, and determines whether a measurement value of the reference signal matches the condition; an operation for determining the trigger condition; and an operation for operating one RAT in a low power mode.

Description

Method and apparatus for transmitting and receiving wake-up signals using a low-power wake-up radio for a next-generation energy-efficient mobile communication system

[0001] The present disclosure relates to the operation of terminals and base stations in a wireless communication system. In particular, the present disclosure relates to a method and apparatus for waking up terminals or cells when the transceiver of a terminal, base station, or cell enters sleep mode in a system using a next-generation low-power radio (hereinafter LR) that supports power saving technology. The present disclosure relates to a method and apparatus for supporting the transmission and reception of low-power wake-up signals (hereinafter LP-WUS) and paging early indication signals (hereinafter PEI) of terminals and base stations in an environment where base stations and terminals can transmit wake-up signals (hereinafter WUS) to wake up terminals or cells.

[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 frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

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

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

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms to guarantee coverage in the terahertz band of 6G mobile communication technology, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas; metamaterial-based lenses and antennas to improve terahertz band signal coverage; high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum); and Reconfigurable Intelligent Surface (RIS) technology; as well as Full Duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] Meanwhile, mobility support methods and devices utilizing terminal location information in non-terrestrial network systems have been proposed, and for terminals capable of utilizing these methods, the need has arisen for mobility support methods that use relative location measurement between the terminal and the network, which differs from existing signal strength-based methods.

[0009] The present disclosure aims to provide a signal transmission method and apparatus that support idle and inactive mode operation of a terminal using the same, in a case where the terminal includes a wake-up radio capable of transmitting and receiving a low-power wake-up signal to support power saving mode operation of a network in a wireless communication system.

[0010] The technical problems to be solved in the various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0011] A terminal according to one embodiment of the present disclosure may include, depending on certain conditions, receiving a reference signal from adjacent cells and base stations via Wake Up Radio (WUR) and New Radio (NR), receiving a signal including certain trigger conditions from a base station, determining whether a measured value of the reference signal corresponds to the said conditions, determining the trigger conditions, and operating one RAT in a low-power mode.

[0012] According to one embodiment of the present disclosure, a method performed by a terminal in a wireless communication system comprises the steps of: receiving a first message from a base station containing setting information related to an LP-WUS (low power - wake up signal); determining to monitor the LP-WUS based on the setting information related to the LP-WUS; transmitting a second message to the base station containing status information of the terminal's LP-WUR (low power - wake up radio) based on the monitoring of the LP-WUS; and receiving the LP-WUS for the terminal's MR (main radio) from the base station, wherein if the terminal is monitoring the LP-WUS, the terminal does not attempt to receive a PEI (paging early indication).

[0013] Additionally, according to one embodiment of the present disclosure, a method performed by a base station in a wireless communication system comprises the steps of: transmitting a first message containing configuration information related to an LP-WUS (low power - wake up signal) to a terminal; receiving a second message from the terminal containing status information of an LP-WUR (low power - wake up radio) of the terminal based on the LP-WUS related configuration information; determining the use of an LP-WUS or a PEI for the terminal based on the status information of the LP-WUR of the terminal; and transmitting the LP-WUS for the MR (main radio) of the terminal to the terminal when the status information of the LP-WUR of the terminal indicates monitoring of the LP-WUS, wherein when the status information of the LP-WUR of the terminal indicates monitoring of the LP-WUS, a PEI (paging early indication) for the terminal is not transmitted.

[0014] Additionally, according to one embodiment of the present disclosure, a terminal of a wireless communication system comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and a memory connected to communicate with the at least one processor and capable of executing the at least one processor individually or in any combination thereof, wherein the terminal receives a first message from a base station containing LP-WUS (low power - wake up signal) related configuration information, determines monitoring of the LP-WUS based on the LP-WUS related configuration information, transmits a second message to the base station containing status information of the terminal's LP-WUR (low power - wake up radio) based on the monitoring of the LP-WUS, and stores a command to receive the LP-WUS for the terminal's MR (main radio) from the base station; and if the terminal is monitoring the LP-WUS, the terminal may provide a terminal that does not attempt to receive a PEI (paging early indication).

[0015] Additionally, according to one embodiment of the present disclosure, a base station of a wireless communication system comprises at least one transceiver, at least one processor connected to communicate with the at least one transceiver, and a memory that stores an instruction to transmit the LP-WUS (low power - wake up signal) related configuration information to a terminal, and a second message including status information of the LP-WUR (low power - wake up radio) of the terminal based on the LP-WUS related configuration information, and a memory that stores an instruction to transmit the LP-WUS for the terminal's MR (main radio) to the terminal based on the status information of the LP-WUR of the terminal, and when the status information of the LP-WUR of the terminal indicates monitoring of the LP-WUS, the base station transmits the LP-WUS to the terminal. PEI (paging early indication) for the terminal can provide a base station that is not transmitting.

[0016] According to one embodiment of the present disclosure, when one or more RATs (radio access technologies) are used in a wireless communication system, power consumption of the terminal can be further reduced by operating one RAT in a low-power mode.

[0017] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0018] FIG. 1 is a diagram showing the structure of a next-generation mobile communication system that supports network energy saving according to an embodiment of the present invention.

[0019] FIG. 2 is a drawing for explaining the concept of a low-power radio (hereinafter LR) of a base station or cell according to one embodiment of the present disclosure.

[0020] FIG. 3 is a diagram illustrating an example of a downlink LP-WUS setting and monitoring procedure of a terminal according to an embodiment of the present disclosure.

[0021] FIG. 4 is a diagram illustrating an example of an LP-WUR (low power-wake up radio) status update transmission procedure transmitted by a base station to a terminal according to an embodiment of the present disclosure.

[0022] FIG. 5 is a diagram illustrating an embodiment in which a base station according to an embodiment of the present disclosure selectively transmits LP WUS and PEI to a terminal.

[0023] FIG. 6 is a diagram illustrating an embodiment in which a base station according to an embodiment of the present disclosure selectively transmits an LP-WUS to a terminal.

[0024] FIG. 7 is a diagram illustrating an embodiment in which a terminal according to an embodiment of the present disclosure receives a setting for uplink LP-WUS transmission from a base station and, if necessary, performs uplink LP-WUS transmission to the base station.

[0025] FIG. 8 is a diagram illustrating an embodiment in which a terminal according to an embodiment of the present disclosure receives a setting for uplink LP-WUS transmission from a base station and, if necessary, performs uplink LP-WUS transmission to the base station.

[0026] FIG. 9 is a diagram illustrating an embodiment in which a terminal according to an embodiment of the present disclosure receives a signal from a base station to change the setting of an LP-WUS cycle and performs a change of the cycle accordingly.

[0027] FIG. 10 is a drawing illustrating the structure of a base station according to one embodiment of the present disclosure.

[0028] FIG. 11 is a drawing illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0029] The operating principles of the present disclosure will be described in detail below with reference to the attached drawings. In describing the present disclosure below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the present disclosure. Furthermore, the terms described below are defined in consideration of their functions in the present disclosure, and these may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0030] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0031] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (base station), radio access unit, base station controller, or a node on a network. A terminal may include a UE (user equipment), MS (mobile station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station. Furthermore, while LTE or LTE-A systems may be described as examples below, embodiments of this disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which embodiments of this disclosure can be applied, and the 5G below may 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 made at the discretion of a person with skilled technical knowledge, without departing significantly from the scope of the present disclosure. In this case, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams may be executed by computer program instructions.

[0032] Since these computer program instructions can be loaded onto the processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means for performing the functions described in the flowchart block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement functions in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing means of instruction for performing the functions described in the flowchart block(s). Since the computer program instructions can also be loaded onto the computer or other programmable data processing equipment, the instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a computer-executable process can also provide steps for performing the functions described in the flowchart block(s).

[0033] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specified logical function(s). Also, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may be executed in reverse order according to the corresponding function. In this case, the term “part” as used in this embodiment refers to a software or hardware component such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), and the “part” may perform certain roles. However, the meaning of “part” is not limited to software or hardware. The “part” may be configured to reside in an addressable storage medium or may be configured to run one or more processors. Accordingly, as an example, 'part' includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or further separated into additional components and 'parts'. Furthermore, the components and 'parts' may be implemented to utilize one or more CPUs within a device or secure multimedia card. Additionally, in an embodiment, 'part' may include one or more processors.

[0034] For convenience of explanation, the present disclosure uses terms and names defined in the 5GS and NR standards defined by the 3GPP (The 3rd Generation Partnership Project). However, the present disclosure is not limited to the above terms and names and may be applied equally to wireless communication networks conforming to other standards. For example, the present disclosure may be applied to 3GPP 5GS / NR (5th generation mobile communication standards).

[0035] Fifth-generation wireless communication systems operate in higher frequency (mmWave) bands, and terminals (UEs, user equipment) and base stations (gNBs, new radio node Bs, NR gNBs) communicate with each other using beamforming. Beamforming technology is used to mitigate propagation path loss and increase the propagation distance for communication in higher frequency bands. Beamforming improves transmission and reception performance by using high-gain antennas. Beamforming can be classified into transmission (TX) beamforming, performed at the transmitting end, and reception (RX) beamforming, performed at the receiving end. Generally, TX beamforming increases directivity by using multiple antennas to densely position the area where radio waves reach in a specific direction. In this context, a collection of multiple antennas can be referred to as an antenna array, and each antenna included in the array can be referred to as an array element. Antenna arrays can be configured in various forms, such as linear arrays or planar arrays. The use of TX beamforming results in increased signal directivity, thereby increasing the propagation distance. Furthermore, since the signal is rarely transmitted in directions other than the directional direction, signal interference acting on other receivers is significantly reduced. The receiver can perform beamforming on the RX signal using an RX antenna array. RX beamforming increases the strength of the RX signal transmitted in a specific direction by concentrating radio waves in that direction, and provides the effect of blocking interference signals by excluding signals transmitted in non-specific directions from the RX signal. Using beamforming technology, the transmitter can create multiple transmit beam patterns in different directions. Each of these transmit beam patterns can also be referred to as a transmit (TX) beam.Wireless communication systems operating at high frequencies transmit signals within a cell using multiple narrow TX beams, as each narrow TX beam provides coverage to a portion of the cell. The narrower the TX beam, the higher the antenna gain, and consequently, the propagation distance of the signal transmitted using beamforming increases. A receiver can also generate multiple receive (RX) beam patterns in different directions. Each of these receive patterns can also be referred to as a receive (RX) beam.

[0036] Fifth-generation wireless communication systems support not only standalone mode operation but also dural connectivity (DC). In DC, multiple Rx / Tx UEs can be configured to utilize resources provided by two different nodes (or NBs) connected via a non-ideal backhaul. One node acts as the master node (MN) and the other as the secondary node (SN). The MN and SN are connected via network interfaces, and at least the MN is connected to the core network. NR also supports Multi-RAT dual connectivity (MR-DC) operation, where UEs in the RRC_CONNECTED state (radio resource control_connected state) are configured to utilize radio resources provided by two distinct schedulers connected via a non-ideal backhaul, providing E-UTRA (i.e., when the node is an ng-eNB) or NR access (i.e., when the node is a gNB). In NR, a UE in the RRC_CONNECTED state that is not configured with CA (carrier aggregation) / DC has only one serving cell consisting of a primary cell. For a UE in the RRC_CONNECTED state configured with CA / DC, the term 'serving cell' is used to denote a set of cells that includes special cells and all subcells. In NR, a master cell group (MCG) refers to a group of serving cells associated with a master node, which includes a PCell (primary cell) and optionally one or more SCell(s) (secondary cell(s)). In NR, a secondary cell group (SCG) refers to a group of serving cells associated with a secondary node, which includes a PSCell (primary secondary cell, primary SCG cell) and optionally one or more SCells.In NR, a PCell (Primary Cell) refers to a serving cell within an MCG operating at the fundamental frequency where the UE performs the initial connection setup procedure or initiates the connection reset procedure. For a UE configured with CA, an Scell ​​in NR is a cell that provides additional radio resources on top of a special cell. A PSCell (Primary SCG Cell) refers to a serving cell within an SCG where the UE performs random access when executing the Reconfiguration with Sync procedure. For dual connectivity operation, a SpCell (i.e., special cell) refers to a PCell in an MCG or a PSCell in an SCG; otherwise, the term special cell refers to a PCell.

[0037] Acquisition of System Information in 5th Generation Wireless Communication Systems: In 5th generation wireless communication systems, a Node B (gNB) or base station broadcasts a synchronization signal (SS) and a Physical Broadcast Channel (PBCH) block (SSB), which consists of primary and secondary synchronization signals (PSS, SSS) and system information. System information contains common parameters required for communication within a cell. In 5th generation wireless communication systems (also known as next-generation radio or NR), system information (SI) is divided into a master information block (MIB) and multiple system information blocks (SIB), where:

[0038] - MIB is always transmitted over the BCH (broadcast channel) at a period of 80 ms, is repeated within 80 ms, and contains parameters necessary to obtain SIB1 from the cell.

[0039] - SIB1 is transmitted over the DL-SCH (downlink shared channel) at a period of 160ms, and the transmission repetition is variable. The default transmission repetition period of SIB1 is 20ms, but the actual transmission repetition period depends on the network implementation. The scheduling information of SIB1 includes the mapping between the SIB and SI messages, the periodicity of each SI message, and the SI window length. The scheduling information of SIB1 includes an indicator for each SI message, indicating whether the corresponding SI message is broadcast. If at least one SI message is not broadcast, SIB1 may include a random access resource (PRACH (physical random access channel) preamble(s) and PRACH resource(s)) that requests the gNB to broadcast one or more SI messages.

[0040] - SIBs other than SIB1 are carried in SI messages transmitted over the DL-SCH. Only SIBs with the same period can be mapped to the same SI message. Each SI message is transmitted within a periodically occurring time-domain window (referred to as an SI-window of equal length for all SI messages). Each SI message is associated with an SI-window, and SI-windows of different SI messages do not overlap. That is, only the corresponding SI message is transmitted within a single SI-window. Any SIB other than SIB1 can be configured as cell-specific or region-specific using the markings within SIB1. A cell-specific SIB is applicable only within the cell providing the SIB, while a region-specific SIB is applicable within a region called an SI area, which consists of one or more cells and is identified by the systemInformationAreaID.

[0041] - The UE acquires SIB1 from the camped cell or serving cell. The UE checks the BroadcastStatus bit in SIB1 for the SI message it needs to acquire. The gNB signals the SI request configuration for the SUL (supplementary uplink) using the IE (information element) si-RequestConfigSUL in SIB1. If the IE si-RequestConfigSUL does not exist in SIB1, the UE assumes that the SI request configuration for the SUL has not been signaled by the gNB. The gNB signals the SI request configuration for the NUL (normal uplink) using the IE si-RequestConfig in SIB1. If the IE si-RequestConfig does not exist in SIB1, the UE assumes that the SI request configuration for the NUL has not been signaled by the gNB. If the SI message it needs to acquire is not being broadcast (i.e., the BroadcastStatus bit is set to 0), the UE begins transmitting the SI request. The procedure for transmitting the SI request is as follows:

[0042] - The gNB signals the SI request configuration for the SUL, and if the SUL selection criteria are met (i.e., the reference signal received power (RSRP) derived from the SSB measurement of the camped cell or serving cell is less than rsrp-ThresholdSSB-SUL, where rsrp-ThresholdSSB-SUL is signaled by the gNB (e.g., in a broadcast signaling scheme such as SIB1)), the UE initiates the transmission of the SI request based on the SI request in Msg1 (message 1) on the SUL. In other words, the UE initiates a random access procedure using the PRACH preamble(s) and PRACH resource(s) within the SI request configuration of the SUL. The UE transmits Msg1 (i.e., the random access preamble) and waits for acknowledgment of the SI request. The random access resources (PRACH preamble(s) and PRACH time(s)) indicated in the SI request configuration of the SUL are used for Msg1. Msg1 is transmitted from the SUL. When an acknowledgment for an SI request is received, the UE monitors the SI window of the requested SI message during one or more SI period(s) of the corresponding SI message.

[0043] - Otherwise, the gNB signals the SI request configuration for the NUL, and if the NUL selection criteria are met (i.e., the SUL is supported in the camped cell or serving cell, and the RSRP derived from the SSB measurement of the camped cell or serving cell is greater than or equal to rsrp-ThresholdSSB-SUL; or the SUL is not supported in the serving cell), the UE initiates the transmission of the SI request based on the Msg1-based SI request on the NUL. In other words, the UE initiates a random access procedure using the PRACH preamble(s) and PRACH resource(s) within the NUL's SI request configuration. The UE transmits Msg1 (i.e., the random access preamble) and waits for acknowledgment of the SI request. The random access resources (PRACH preamble(s) and PRACH time(s)) indicated in the NUL's SI request configuration are used for Msg1. Msg1 is transmitted from the NUL. When an acknowledgment for an SI request is received, the UE monitors the SI window of the requested SI message during one or more SI period(s) of the corresponding SI message.

[0044] - Otherwise, the UE initiates the transmission of an SI request based on the Msg3 (message 3)-based SI request. In other words, the UE initiates the transmission of the RRCSystemInfoRequest message (345). The UE transmits Msg1 (i.e., the random access preamble) and waits for a random access response. Common random access resources (PRACH preamble(s) and PRACH time(s)) are used for Msg1. Upon receiving a UL acknowledgment in the random access response, the UE transmits the RRCSystemInfoRequest message and waits for an acknowledgment for the SI request (i.e., the RRCSystemInfoRequest message). When an acknowledgment for the SI request (i.e., the RRCSystemInfoRequest message) is received, the UE monitors the SI window of the requested SI message during one or more SI period(s) of the corresponding SI message. Note that if SUL is configured, the UL (uplink) carrier selection for the transmission of Msg1 will be selected by the UE in a manner similar to the way the UE selected for the Msg1-based SI request. SUL is a UL carrier selected when the RSRP derived from the SSB measurement of the camped cell or serving cell is less than rsrp-ThresholdSSB-SUL, where rsrp-ThresholdSSB-SUL is signaled by the gNB (e.g., in a broadcast signaling scheme such as SIB1). NUL is a UL carrier selected when the RSRP derived from the SSB measurement of the camped cell or serving cell is greater than or equal to rsrp-ThresholdSSB-SUL, where rsrp-ThresholdSSB-SUL is signaled by the gNB (e.g., in a broadcast signaling scheme such as SIB1).

[0045] Physical downlink control channel (PDCCH) in a 5th generation wireless communication system: In a 5th generation wireless communication system, a physical downlink control channel (PDCCH) is used to schedule DL (downlink) transmission on a physical downlink shared channel (PDSCH) and UL transmission on a physical uplink shared channel (PUSCH), wherein downlink control information (DCI) on the PDCCH includes at least modulation and coding formats, resource allocation, and downlink allocations including hybrid automatic repeat request (HARQ) information related to the DL-SCH. In addition to scheduling, PDCCH may be used to enable and disable PUSCH transmissions configured with configured grants, enable and disable PDSCH semi-persistent transmissions, notify one or more UEs of slot formats, notify one or more UEs of PRB(s) (physical resource block(s)) and OFDM (orthogonal frequency-division multiplexing) symbol(s) so that the UEs can assume that a transmission is not intended, transmit TPC (transmit power control) commands for PUCCH and PUSCH, transmit one or more TPC commands for SRS (sounding reference signal) transmissions by one or more UEs, switch the active bandwidth of a UE, and initiate random access procedures. The UE monitors a set of PDCCH candidates for monitoring cases configured in a CORESET, which is one or more configured control resource sets according to the corresponding search space configuration. A CORESET consists of a set of PRBs having one to three OFDM symbol time durations.Resource units, namely resource element groups (REGs) and control channel elements (CCEs), are defined within a CORESET where each CCE constitutes a set of REGs. Control channels are formed by sets of CCEs, and different code rates for control channels are realized by assembling different numbers of CCEs. Interleaved CCE-to-REG mapping and non-interleaved CCE-to-REG mapping are supported in the CORESET. Polar coding is used for the PDCCH. Each resource element group carrying the PDCCH carries its own demodulation reference signal (DMRS). QPSK modulation is used for the PDCCH.

[0046] In 5th generation wireless communication systems, a list of search space configurations is signaled by the gNB for the configured bandwidth part (BWP), which is uniquely identified by an identifier for each search configuration. An identifier to identify the search space configuration to be used for specific purposes, such as paging reception, SI reception, and random access response reception, is explicitly signaled by the gNB. The NR search space configuration includes the parameters monitoring periodicity-PDCCH-slot, monitoring offset-PDCCH-slot, monitoring symbol-PDCCH-in-slot, and duration. The UE determines the PDCCH monitoring case within a slot using the parameters PDCCH monitoring periodicity (monitoring periodicity-PDCCH-slot), PDCCH monitoring offset (monitoring offset-PDCCH-slot), and PDCCH monitoring pattern (monitoring symbol-PDCCH-in-slot). The PDCCH monitoring case exists in slots from 'x' to x+duration, where the slot at number 'x' in the radio frame at number 'y' satisfies the following equation:

[0047] (y*(number of slots in radio frame) + x - monitoring offset-PDCCH-slot) mod (monitoring periodicity-PDCCH-slot) = 0;

[0048] The start symbol of the PDCCH monitoring case is given by the monitoring symbol-PDCCH-in-slot. The length (in symbols) of the PDCCH monitoring case is given by the core set associated with the search space. The search space configuration includes the identifier of the associated core set configuration. For each configured BWP, there is a list of core set configurations signaled by the gNB, where each core set configuration is uniquely identified by an identifier. Note that each radio frame has a duration of 10 ms. Radio frames are identified by a radio frame number or a system frame number. Each radio frame consists of multiple slots, and the number of slots within the radio frame and the duration of the slots depend on the subcarrier interval. The number of slots within the radio frame and the duration of the slots for each supported SCS are predefined in the NR. Each core set configuration is associated with a list of TCI (Transmission Configuration Indicator) states. A single DL RS ID (SSB or CSI RS (Channel State Information Reference Signal)) is configured per TCI state. A list of TCI states corresponding to the core set configuration is signaled by the gNB via the RRC signal. One of the TCI states in the list is activated and indicated to the UE by the gNB via the MAC (medium access control) CE (control element). The TCI state indicates the DL TX beam (the DL TX beam is QCLed with the SSB / CSI RS of the TCI state) used by the gNB for the transmission of the PDCCH in the search space PDCCH monitoring cases. For PDSCH, the TCI state of the scheduling PDCCH can be used for the scheduled PDSCH. Alternatively, the TCI state of the PDCCH for the lowest core set ID in the slot is used for the PDSCH. Alternatively, the RRC + MAC CE + DCI combination is used to indicate the TCI state for the PDSCH.RRC constitutes a list of TCI states, MAC CE represents a subset of these TCI states, and DCI represents a single TCI state from the list of TCI states indicated in MAC CE.

[0049] Bandwidth Adaptation (BA) in 5th Generation Wireless Communication Systems: Bandwidth adaptation (BA) is supported in 5th generation wireless communication systems. With BA, the transmit and receive bandwidth of a UE does not need to be as large as the cell's bandwidth and can be adjusted: the width can be commanded to change (e.g., to be reduced during periods of low activity to save power); the position can be shifted in the frequency domain (e.g., to increase scheduling flexibility); and the subcarrier spacing can be commanded to change (e.g., to allow for different services). A subset of the cell's total bandwidth is called a bandwidth part (BWP). BA is implemented by configuring RRC-connected UEs into BWP(s) and informing the UE which of the configured BWPs is currently active. Once BA is configured, the UE only needs to monitor the PDCCH from one active BWP. In other words, there is no need to monitor the PDCCH across the entire DL frequency of the serving cell. In the RRC connected state, the UE is configured with one or more DL and UL BWPs for each configured serving cell (i.e., PCell or SCell). An active serving cell always has one active UL and DL BWP at any given time. BWP switching for a serving cell is used to enable inactive BWPs and simultaneously disable active BWPs. BWP switching is controlled by a PDCCH indicating a downlink allocation or uplink grant, and by a MAC entity at the start of a bwp-InactivityTimer, RRC signal, or random access procedure. When a SpCell is added or a SCell is enabled, the DL BWP and UL BWP indicated by firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-Id, respectively, are enabled without receiving a PDCCH indicating a downlink allocation or uplink grant.The active BWP for the serving cell is directed by either the RRC or the PDCCH. For unpaired spectrum, the DL BWP is paired with the UL BWP, and BWP switching is common for both UL and DL. When the BWP inactivity timer expires, the UE switches the active DL BWP to the default DL BWP or the initial DL BWP (if the default DL BWP is not configured).

[0050] Random Access in 5th Generation Wireless Communication Systems: Random Access (RA) is supported in 5G wireless communication systems. RA is used to achieve Uplink (UL) time synchronization. RA is used for UE Initial Access, Handover, Radio Resource Control (RRC) Connection Re-establishment procedures, Scheduling Request transmission, Secondary Cell Group (SCG) addition / modification, Beam Failure Recovery, and the transmission of data or control information from the UL by UEs that are connected to the RRC but in an asynchronous state.

[0051] CBRA (Contention Based Random Access): This is also referred to as 4-Step CBRA or 4-Step Random Access. In this type of random access, the UE first transmits a Random Access Preamble (Msg1) and then waits for a RAR in the RAR (Random Access Response) window. The RAR is also referred to as Msg2 (Message 2). The next-generation node B (gNB) transmits the RAR on the PDSCH (Physical Downlink Shared Channel). The PDCCH that schedules the PDSCH carrying the RAR is addressed by the RA-RNTI (RA-radio network temporary identifier). The RA-RNTI identifies the time-frequency resource (also referred to as the PRACH (Physical RA Channel) occasion, PRACH(TX) occasion, or RO) at which the RA preamble was detected by the gNB. RA-RNTI is calculated as RA-RNTI = 1 + s_id + 14*t_id + 14*80*f_id + 14*80*8*ul_carrier_id, where s_id is the index of the first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the PRACH occurrence where the UE transmitted Msg1, i.e., the RA preamble (0 ≤ s_id < 14). t_id is the index of the first slot of the PRACH occasion (0 ≤ t_id < 80), and f_id is the index of the PRACH Occasion in the frequency domain within the slot (0 ≤ f_id < 8). ul_carrier_id is the UL carrier used for Msg1 transmission, having a value of 0 for a Normal UL carrier and 1 for a Supplementary UL (SUL) carrier.Multiple RARs for various random access preambles detected by the gNB may be multiplexed by the gNB in ​​the same RAR Media Access Control (MAC) protocol data unit (PDU). A RAR in the MAC PDU is considered to correspond to the terminal's RA preamble transmission if it contains the random access preamble identifier (RAPID) of the RA preamble transmitted by the terminal. If the UE does not receive a RAR corresponding to its RA preamble transmission within the RAR window and has not yet transmitted the RA preamble a set number of times (set by the gNB in ​​the RACH configuration), the UE returns to the first step, namely the step of selecting a Random Access Resource, selects a preamble / RACH occasion, and transmits the RA preamble. Backoff may be applied before returning to that first step.

[0052] When the terminal receives a RAR corresponding to its RA Preamble transmission, it transmits Message 3 (Msg3) from the UL grant received in the RAR. Msg3 includes messages such as an RRC connection request, an RRC connection re-establishment request, an RRC handover confirm, a scheduling request, and an SI request, and may include a UE identity (e.g., a cell-radio network temporary identifier (C-RNTI), an SAE (system architecture evolution)-temporary mobile subscriber identity (S-TMSI), or a random number). After transmitting Msg3, the UE starts a contention resolution timer. While the contention resolution timer is running, if the UE receives a PDCCH (Physical Downlink Control Channel) directed to the C-RNTI included in Msg3, it is determined that contention resolution has been successful, the contention resolution timer is stopped, and the RA procedure is completed. When the contention resolution timer receives a CE (contention resolution MAC control element) containing the UE's contention resolution identity (the first X bit of the CCCH (common control channel) service data unit (SDU) transmitted in Msg3) while the contention resolution timer is running, the contention resolution is considered successful, the contention resolution timer is stopped, and the RA procedure is completed.If the contention resolution timer expires and the terminal fails to transmit the RA preamble a set number of times, the terminal may return to the first step, random access Rrsource(preamble / RACH occision), to transmit the RA preamble. Backoff may be applied before returning to the first step.

[0053] Contention-free random access (CFRA): This is also referred to as legacy CFRA or 4-step CFRA. The CFRA procedure is used in scenarios requiring low latency, such as handover, timing advance establishment for a secondary cell (Scell), and when a gNB (node ​​B) assigns a UE dedicated random access preamble. The UE transmits a dedicated RA preamble. The gNB transmits a RAR for the PDSCH addressed by RA-RNTI. The RAR carries the RA preamble identifier and timing alignment information. The RAR may also include UL grants. The RAR is transmitted within the RAR window, similar to the Contention-Based RA (CBRA) procedure. CFRA is considered successfully completed upon receiving a RAR containing the RA Preamble Identifier (RAPID) of the RA preamble transmitted by the terminal. When RA is initiated for beam failure recovery, CFRA is considered to have successfully completed when it receives a PDCCH addressed to C-RNTI in the search space for beam failure recovery. If the UE does not receive a RAR by the time the RAR window expires, it considers the RA not to have completed successfully, and if it has not repeated the RA preamble a sufficient number of times (set as gNB in ​​the RACH configuration), it retransmits the RA preamble.

[0054] In the event of specific events such as handover and beam failure recovery, if dedicated preamble(s) are assigned to the UE, during the first phase of random access—that is, during the selection of random access resources for Msg1 transmission—the UE may decide whether to transmit the dedicated or non-dedicated preamble. Dedicated preambles are generally provided for a subset of SSBs / CSI RSs. If, among the SSBs / CSI RSs for which contention-free random access resources (i.e., dedicated preambles / ROs) are provided in the gNB, there are no SSBs / CSI RSs whose DL RSRP is above the threshold, the UE selects the non-dedicated preamble. Otherwise, the UE selects the dedicated preamble. Thus, during the RA procedure, one random access attempt may be a CFRA and another random access attempt may be a CBRA.

[0055] Two-Step Contention-Based Random Access (2-Step CBRA): In the first step, the UE transmits a random access preamble on PRACH and a payload (i.e., MAC PDU) on PUSCH. The transmission of the random access preamble and payload is also referred to as MsgA (message A). In the second step, after transmitting MsgA, the UE monitors for a response from the network (i.e., gNB) within the configured window. This response is also referred to as MsgB (message B). The next-generation node B (gNB) transmits MsgB on the Physical Downlink Shared Channel (PDSCH). The PDCCH scheduling the PDSCH carrying MsgB is addressed by the MsgB-Radio Network Temporary Identifier (MSGB-RNTI). MSGB-RNTI identifies the time-frequency resource (also referred to as the physical RA channel (PRACH) time or the PRACH transmission (TX) time or the RA channel (RACH) time) at which the RA frame is detected by the gNB. MSGB-RNTI is calculated as follows: RA-RNTI = 1 + s_id + 14 * t_id + 14 * 80 * f_id + 14 * 80 * 8 * ul_carrier_id + 14 x 80 x 8 x 2, where s_id is the index of the first Orthogonal Frequency Division Multiplexing (OFDM) symbol at the time of PRACH when the UE transmitted Msg1, i.e., the RA preamble (0 <= s_id < 14), t_id is the index of the first slot at the time of PRACH (0 <= t_id < 80), f_id is the index of the time of PRACH within the slot in the frequency domain (0 <= f_id < 8), and ul_carrier_id is the UL carrier used for Msg1 transmission (0 for normal UL (NUL) carrier, 1 for supplementary UL (SUL) carrier).

[0056] If a CCCH SDU is transmitted as the MsgA payload, the UE performs contention resolution using the contention resolution information in MsgB. If the contention resolution ID received in MsgB matches the first 48 bits of the CCCH SDU transmitted in MsgA, contention resolution is successful. If a C-RNTI is transmitted as the MsgA payload, contention resolution is successful if the UE receives a PDCCH addressed to the C-RNTI. If contention resolution is successful, the random access procedure is considered to have been successfully completed. Instead of contention resolution information corresponding to the transmitted MsgA, MsgB may contain fallback information corresponding to the random access preamble transmitted in MsgA. If fallback information is received, the UE transmits Msg3 and performs contention resolution using Msg4 as in the CBRA procedure. If contention resolution following the fallback fails (i.e., by transmitting Msg3), the UE retransmits MsgA. If, after sending MsgA, the configuration window for the UE to monitor network responses expires and the UE does not receive MsgB containing contention resolution or fallback information as described above, the UE resends MsgA. If the random access procedure is not successfully completed even after sending the message a configurable number of times, the UE returns to the 4-Step RACH procedure. That is, the UE sends only the PRACH preamble.

[0057] The MsgA payload may include one or more of the Common Control Channel (CCCH) Service Data Unit (SDU), Dedicated Control Channel (DCCH) SDU, Dedicated Traffic Channel (DTCH) SDU, Buffer Status Reporting (BSR) MAC Control Element (CE), Power Headroom Reporting (PHR) MAC CE, SSB information, C-RNTI MAC CE, or padding. In the first stage, the MsgA may include a UE ID (e.g., Random ID, S-TMSI, C-RNTI, Resume ID, etc.) along with a preamble. The UE ID may be included within the MAC PDU of the MsgA. UE IDs such as C-RNTI may be carried in the MAC CE, and the MAC CE is included in the MAC PDU. Other UE IDs (Random ID, S-TMSI, C-RNTI, Resume ID, etc.) may be carried in the CCCH SDU. The UE ID may be a Random ID, S-TMSI, C-RNTI, Resume ID, IMSI, Idle Mode ID, Inactive Mode ID, etc. The UE ID may differ in different scenarios where the UE performs the RA procedure. When the UE performs the RA after powering on (before connecting to the network), the UE ID is a random ID. When the UE performs the RA while idle after connecting to the network, the UE ID is S-TMSI. If the UE has a C-RNTI assigned (e.g., connected state), the UE ID is C-RNTI. If the UE is in an inactive state, the UE ID is the resumption ID. In addition to the UE ID, some additional control information may be sent to the MsgA. This control information may be included in the MAC PDU of the MsgA. This control information may include connection request indications, connection resumption request indications, SI request indications, buffer status indications, beam information (such as one or more DL TX beam IDs or SSB IDs), beam failover indications / information, data indicators, cell / BS / TRP switching indications, connection re-establishment indications, reconfiguration complete or handover complete messages, etc.

[0058] 2-Step Contentless Random Access (2-Step CFRA): In this case, the gNB allocates dedicated random access preamble(s) and PUSCH resource(s) for MsgA transmission to the UE. RO(s) to be used for preamble transmission may also be specified. In the first step, the UE uses the contentless random access resources (i.e., dedicated preamble / PUSCH resource / RO) to transmit the random access preamble to PRACH and the payload to PUSCH. In the second step, after MsgA transmission, the UE monitors for a response from the network (i.e., gNB) within the configured window. This response is also referred to as MsgB.

[0059] The next-generation node B (gNB) transmits MsgB over the physical downlink shared channel (PDSCH). The PDCCH that schedules the PDSCH carrying MsgB is addressed by the MsgB-radio network temporal identifier (MSGB-RNTI). The MSGB-RNTI identifies the time-frequency resource at which the RA frame was detected by the gNB (also referred to as the physical RA channel (PRACH) time, or the PRACH transmission (TX) time, or the RA channel (RACH) time). MSGB-RNTI is calculated as follows: RA-RNTI = 1 + s_id + 14 * t_id + 14 * 80 * f_id + 14 * 80 * 8 * ul_carrier_id + 14 x 80 x 8 x 2, where s_id is the index of the first Orthogonal Frequency Division Multiplexing (OFDM) symbol at the PRACH time when the UE transmitted Msg1, i.e., the RA preamble, and 0 <= s_id < 14; t_id is the index of the first slot at the PRACH time (0 <= t_id < 80), f_id is the index of the PRACH time within the slot in the frequency domain (0 <= f_id < 8), and ul_carrier_id is the UL carrier used for Msg1 transmission (0 for normal UL (NUL) carrier, 1 for supplementary UL (SUL) carrier).

[0060] If the UE receives a PDCCH addressed to C-RNTI, the random access procedure is considered to have been successfully completed. If the UE receives fallback information corresponding to the transmitted preamble, the random access procedure is considered to have been successfully completed.

[0061] In the case of specific events such as handover and beam failure recovery where dedicated preamble(s) and PUSCH resource(s) are assigned to the UE, the UE decides whether to transmit a dedicated preamble or a non-dedicated preamble during the first step of random access, namely, the selection of random access resources for MsgA transmission. Dedicated preambles are typically provided to a subset of SSBs / CSI RSs. If, among the SSBs / CSI RSs for which contention-free random access resources (i.e., dedicated preamble / ROs / PUSCH resources) are provided by the gNB, there are no SSBs / CSI RSs with a DL RSRP above a threshold, the UE selects a non-dedicated preamble. Otherwise, the UE selects a dedicated preamble. Thus, during the RA procedure, one random access attempt may be a 2-Step CFRA and another random access attempt may be a 2-Step CBRA.

[0062] When a random access procedure is initiated, the UE first selects a carrier (SUL or NUL). If the carrier to be used for the random access procedure is explicitly signaled by the gNB, the UE selects the signaled carrier to perform the random access procedure. If the carrier to be used for the random access procedure is not explicitly signaled by the gNB, and if the serving cell for the random access procedure is configured to have a supplementary uplink and the RSRP of the downlink path loss reference is less than rsrp - ThresholdSSB - SUL, the UE selects a SUL carrier to perform the random access procedure. Otherwise, the UE selects a NUL carrier to perform the random access procedure. After selecting the UL carrier, the UL and DL BWP for the random access procedure are determined as specified in Section 5.15 of TS 38.321. The UE then determines whether to perform a 2-Step or 4-Step RACH for this random access procedure.

[0063] - If this random access procedure is initiated by the PDCCH order and the ra-PreambleIndex explicitly provided by the PDCCH is not 0b000000, the UE selects 4Step RACH.

[0064] - Otherwise, if a 2-step contention-free random access resource for this random access procedure is signaled by gNB, the UE selects 2-step RACH.

[0065] - Otherwise, if a 4-step contention-free random access resource for this random access procedure is signaled by gNB, the UE selects 4-step RACH.

[0066] - Otherwise, if the UL BWP selected for this random access procedure consists only of 2-Step RACH resources, the UE selects 2-Step RACH.

[0067] - Otherwise, if the UL BWP selected for this random access procedure consists only of 4-Step RACH resources, the UE selects 4-Step RACH.

[0068] Otherwise, if the UL BWP selected for this random access procedure consists of both 2-Step and 4-Step RACH resources,

[0069] - If the RSRP of downlink path loss is below the configured threshold, the UE selects 4-Step RACH. Otherwise, the UE selects 2-Step RACH.

[0070] Paging in 5th Generation Wireless Communication Systems: In 5th generation (also known as NR or New Radio) wireless communication systems, a UE can be in one of the following RRC states: RRC IDLE, RRC INACTIVE, and RRC CONNECTED. RRC states can be further characterized as follows:

[0071] - In the RRC_IDLE state, UE-specific DRX (discontinuous reception) can be configured by the upper layer (i.e., NAS). The UE monitors short messages transmitted to the P-RNTI via the DCI; monitors the paging channel for CN paging using 5G-S-TMSI; performs neighbor cell measurement and cell (re)selection; and can acquire system information and send SI requests (if configured).

[0072] - In the RRC_INACTIVE state, a UE-specific DRX can be configured by the upper layer or the RRC layer. In this state, the UE stores the UE inactive AS context. The RAN-based alert region is configured by the RRC layer. The UE monitors short messages transmitted to P-RNTI via DCI; monitors paging channels for RAN paging using 5G-S-TMSI and fullI-RNTI; performs neighbor cell measurement and cell (re)selection; performs RAN-based alert region updates periodically and when moving out of the configured RAN-based alert region; can acquire system information and send SI requests (if configured).

[0073] - In RRC_CONNECTED, the UE stores the AS context. Unicast data is transmitted and received with the UE. At the lower layer, the UE can be configured with a UE-specific DRX. If configured, the UE monitors short messages transmitted to the P-RNTI via the DCI; monitors the control channel associated with the shared data channel to determine if data is scheduled for it; provides channel quality and feedback information; performs neighbor cell measurements and measurement reports; and acquires system information.

[0074] An NR-based 5G or Next-Generation Radio Access Network (NG-RAN) consists of NG-RAN nodes, where the NG-RAN node acts as a gNB, providing NR user plane and control plane protocol endpoints to the UE. The gNB is also connected to the 5G core (5GC), more specifically the Access and Mobility Management Function (AMF), via the NG-C interface, and to the User Plane Function (UPF) via the NG-U interface. In 5th generation (also known as NR or New Radio) radio communication systems, the UE can use discontinuous reception (DRX) in the RRC_IDLE and RRC_INACTIVE states to reduce power consumption. In the RRC_IDLE / RRC_INACTIVE state, the UE wakes up briefly at regular intervals (i.e., each DRX cycle) to receive paging, SI update notifications, and emergency notifications. Paging messages are transmitted using the Physical Downlink Shared Channel (PDSCH). The Physical Downlink Common Control Channel (PDCCH) is addressed by the P-RNTI (paging RNTI) if there is a paging message on the PDSCH. The P-RNTI is common to all UEs. To indicate paging for a specific UE, the paging message includes the UE identity (i.e., S-TMSI for RRC_IDLE UEs or I-RNTI for RRC_INACTIVE UEs). A paging message can be paged to multiple UEs by including multiple UE identities. Paging messages are broadcast (i.e., the PDCCH is masked by the P-RNTI) and are transmitted over the data channel (i.e., the PDSCH). SI updates and emergency notifications are included in the DCI, and the PDCCH carrying this DCI is addressed by the P-RNTI.In RRC idle / inactive mode, the UE monitors one paging occasion (PO) per DRX cycle. In RRC idle / inactive mode, the UE monitors the PO in the initial DL BWP. In RRC connected state, the UE monitors one or more POs to receive SI update notifications and emergency notifications. In RRC connected state, the UE can monitor any PO of the paging DRX cycle and monitors at least one PO during the SI modification period. In RRC idle / inactive mode, the UE monitors the PO in the active DL BWP for each DRX cycle. A PO is a set of 'S' PDCCH monitoring occasions, which is the number of SSBs (Synchronization Signals and PBCH Blocks) transmitted from the cell. The UE first determines the paging frame (PF) and determines the PO for the determined PF. One PF is a radio frame (10ms).

[0075] - The PF for the UE is a radio frame with a system frame number 'SFN' satisfying the equation (SFN + PF_offset) mod T = (T div N) * (UE_ID mod N).

[0076] - The index (i_s) representing the index of the PO is determined by i_s = floor(UE_ID / N) mod Ns.

[0077] - T is the UE's DRX cycle.

[0078] - In the RRC_INACTIVE state, T is determined by the minimum of the UE-specific DRX value configured by RRC, the UE-specific DRX value configured by NAS (non-access stratum), and the default DRX value broadcast from system information.

[0079] - In the RRC_IDLE state, T is determined by the minimum of the UE-specific DRX value configured by the NAS and the default DRX value broadcast from the system information. If the UE-specific DRX is not configured by the upper layer (i.e., the NAS), the default value is applied.

[0080] - N: Total number of paging frames in T

[0081] - Ns: Number of paging opportunities for PF

[0082] - PF_offset: Offset used to determine PF

[0083] - UE_ID: 5G-S-TMSI mod 1024

[0084] - Ns, nAndPagingFrameOffset, and the default DRX cycle length are signaled in SIB1. The values ​​for N and PF_offset are derived from the nAndPagingFrameOffset parameter as defined in TS 38.331. If there is no 5G-S-TMSI, such as when the UE is not yet registered with the network, the default identity UE_ID = 0 must be used in the above PF and i_s formulas.

[0085] - The opportunity for PDCCH monitoring for paging is determined based on the paging-SearchSpace configuration signaled by the gNB.

[0086] - If SearchSpaceId = 0 is configured for pagingSearchSpace, the PDCCH monitoring opportunity for paging is for the RMSI, as defined in Clause 13 of TS 38.213. If SearchSpaceId = 0 is configured for pagingSearchSpace, Ns is 1 or 2. If Ns = 1, there is only one PO starting from the first PDCCH monitoring opportunity for paging in the PF. If Ns = 2, the PO is in the first frame (i_s = 0) or second frame (i_s = 1) of the PF.

[0087] - If a non-zero SearchSpaceId is configured for pagingSearchSpace, the UE monitors the (i_s + 1)th PO. The PDCCH monitoring opportunities for paging are determined based on the paging-SearchSpace configuration signaled by the gNB. The PDCCH monitoring opportunities do not overlap with the UL symbols determined by tdd-UL-DL-ConfigurationCommon, and they are numbered sequentially starting from the first PDCCH monitoring opportunity for paging in the PF. The gNB can signal the firstPDCCH-MonitoringOccasionOfPO parameter for each PO corresponding to each PF. If firstPDCCH-MonitoringOccasionOfPO is signaled, the (i_s + 1)th PO is a set of 'S' consecutive PDCCH monitoring opportunities for paging starting from the PDCCH monitoring opportunity number indicated by firstPDCCH-MonitoringOccasionOfPO (i.e., the (i_s + 1)th value of the firstPDCCH-MonitoringOccasionOfPO parameter). Otherwise, the (i_s + 1)th PO is a set of 'S' consecutive PDCCH monitoring opportunities starting from the (i_s * S)th PDCCH monitoring opportunity for paging. 'S' is the number of actual transmitted SSBs determined by the parameter ssb-PositionsInBurst signaled in SystemInformationBlock1 received from the gNB. The first-PDCCH-MonitoringOccasionOfPO parameter is signaled in SIB1 for paging in the initial DL BWP. For paging in DL BWPs other than the initial DL BWP, the first-PDCCH-MonitoringOccasionOfPO parameter is signaled in the corresponding BWP configuration.

[0088] In 5G NR, a paging enhancement feature was introduced, named Paging Early Indication (PEI) for UE power saving. Previously, in scenarios where only false paging or very infrequent paging existed, the UE could rapidly drain the battery by consuming high power while attempting to receive and monitor paging.

[0089] The concept of Early Paging Indication (PEI) is that if a UE provides advance notice of its Paging Opportunity (PO), it indicates whether the UE needs to monitor it. This allows the UE to skip time-frequency synchronization prior to the PO if monitoring is not required. PEI can be signaled via downlink control information messages or reference signals included in the physical downlink control channel.

[0090] Another important aspect related to PEI is the ability to provide subgrouping information that divides UEs sharing the same paging opportunity into subgroups. This lowers the group paging rate and reduces false paging alarms.

[0091] PEI can be signaled via DCI or reference signals. SIB 1 is used as the PEI configuration IE to inform the UE about the PEI configuration. DCI-based Early Paging Indication (PEI) is the preferred option because it can flexibly include subgroup indications and potentially contain short messages and other information. PEI refers to a limited-size DCI search space or sequence transmitted from the gNB prior to each paging opportunity. UEs in an idle / inactive state monitor the PEI search space; if an existing PEI indication is detected, they monitor the next PO. Otherwise, the UE enters a deep sleep and skips PO detection. The achievable power saving gains are attributed to the more limited PEI search space compared to the actual paging PDCCH. Therefore, PEI reduces unnecessary paging opportunity decoding for unpaged UEs, thereby reducing false paging alarms.

[0092] Additionally, PEI DCIs or sequences can be defined for UEs in an idle / inactive state within a specific group. Specifically, UEs in an idle / inactive state are subdivided into multiple paging groups, and PEI DCIs are scrambled in a group-specific manner. Therefore, if an idle / inactive UE decodes a PEI DCI using its own paging group scrambling code and calculates an invalid cyclic redundancy check, it assumes that the transmitted PEI is intended for one or more other paging groups and accordingly skips the PO, further reducing false paging alarms.

[0093] CN-Controlled Subgrouping: The AMF is responsible for assigning subgroup IDs to UEs. The total number of subgroups in CN-controlled subgrouping can be configured up to a maximum of eight, which is determined by the OAM. The AMF sends the subgroup ID to the UE via NAS signaling. The AMF informs the gNB of the assigned subgroup ID to page the UE in the RRC_IDLE / RRC_INACTIVE state. When a paging message for a UE is received from the CN to the gNB or generated by the gNB, the gNB determines the PEI opportunity associated with the PO for the UE. Before the UE is paged from the PO, the gNB transmits the associated PEI and, if supported by the UE(s), indicates the subgroup(s) of the UE(s) to be paged from the PEI. UE ID-Based Subgrouping: The gNB and the UE can determine the subgroup ID based on the UE ID and the total number of subgroups for UE ID-based subgrouping within the cell. The total number of subgroups for UE ID-based subgrouping is determined by the gNB for each cell and may differ across cells. The gNB broadcasts the total number of subgroups for UE ID-based subgrouping within the cell. When a paging message for a UE is received by the gNB from the CN or generated by the gNB, the gNB determines the PEI opportunity associated with the PO for the UE. Before the UE is paged from the PO, the gNB transmits the associated PEI and, if supported by the UE(s), indicates the subgroup(s) of the UE(s) to be paged from the PEI. In SIB1, information related to PEI configuration is transmitted. This includes information related to the PEI search space, DCI 2_7 information, SS indexing, UE-based subgrouping information, and other information related to configuring the PEI and subgrouping on the UE side and at the gNB sublayer.

[0094] FIG. 1 is a diagram showing the structure of a next-generation mobile communication system that supports network energy saving according to an embodiment of the present invention.

[0095] Referring to FIG. 1, a next-generation mobile communication system that supports network energy saving may be composed of a next-generation base station (1-01, g Node B, hereinafter gNB, Node B or base station), a cell (1-06, 1-07, 1-08), and a terminal (1-09, UE or terminal). Here, the gNB (1-01) may be composed of a CU (1-02, central unit) and one or more DUs (1-03, 1-04, distributed unit).

[0096] One CU (1-02) can support one or more DUs (1-03, 1-04), and one 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).

[0097] The UE (1-09) can access the external network through the gNB (1-01) via the cell (1-06, 1-07, 1-08).

[0098] FIG. 2 is a drawing for explaining the concept of a low power radio (hereinafter LR) of a base station or cell according to one embodiment of the present disclosure.

[0099] Referring to FIG. 2, if a base station supporting WUR functions is called a WUR BS (2-1) and a terminal supporting WUR functions is called a WUR UE (2-4), then this WUR BS (2-1) may have a main radio (2-2, MR) for performing wireless communication with the WUR UE (2-4) and a WUR (2-3) for performing a wake-up operation, and this WUR UE (2-4) may have a main radio (2-5, MR) for performing wireless communication with the WUR BS (2-1) and a WUR (2-6) for performing a wake-up operation. At this time, the MR (2-2) of the WUR BS (2-1) can perform wireless communication with the MR (2-5) of the WUR UE (2-4) or the MR of another UE, and the WUR (2-3) of the WUR BS (2-1) can perform wireless communication with the WUR (2-6) of the WUR UE (2-4) or the WUR of another WUR UE.

[0100] In one embodiment, the WUR may be a part of the MR that is not physically two different modules, but is physically one but logically distinct module.

[0101] In one embodiment, the WUR may be part of the MR both physically and logically.

[0102] The above WUR may be referred to as LP-WUR by adding low power, or as a low power radio such as LR or LPR.

[0103] WUR BS and WUR UE can have the following operational configuration states.

[0104] 1. Full On state where both MR and WUR are turned on

[0105] 2. MR On state where only MR is turned on and WUR is off.

[0106] 3. Deep Sleep state where MR is (wholly or partially) off and only WUR is on

[0107] 4. Full Off state where MR and WUR are both turned off (all or part of it).

[0108] 5. Light Sleep state in which MR is turned on but does not transmit certain signals, such as broadcast signals like SSB and SIB, to save power.

[0109] The Deep Sleep mode of the above terminal may be one of the following definitions.

[0110] - A mode in which the terminal disables all or part of the circuits and operations related to MR, thereby being unable to communicate wirelessly via MR and communicating cellular wirelessly via LP-WUR.

[0111] - A mode in which the terminal turns off all or part of the circuits and operations related to MR for most of the time, so that it does not communicate wirelessly via MR and can only transmit and receive messages via LP-WUR, but may briefly occur to perform reception via MR during any resource determined by the network, such as a periodic paging occasion for transmitting and receiving paging.

[0112] FIG. 3 is a diagram illustrating an example of a downlink LP-WUS setting and monitoring procedure of a terminal according to an embodiment of the present disclosure.

[0113] According to FIG. 3, the terminal (3-1) and the serving cell base station (3-2) each include a Main Radio (MR) (3-3, 3-5) which can be represented as 5G NR and a low-power radio, LP-WUR (3-4, 3-6). The base station (3-2) may transmit a signal (e.g., LP-WUS and PEI configuration) containing LP-WUS configuration information and / or PEI configuration information for setting the signal to be received when the terminal performs a power saving operation using LP-WUR (3-7). The signal may be included in a broadcast signal transmitted by the base station (3-2) to the terminal (3-1), for example, an MIB included in an SSB, or in any SIB. Alternatively, it may be transmitted by being included in a unicast signal transmitted by the base station (3-2) to the terminal (3-1), for example, an RRC signal, a MAC signal, or a PHY (physical) signal.

[0114] The signal transmitted in operation 3-7 may include all or part of the following downlink LP-WUS configuration information:

[0115] - Entry condition for the terminal to start monitoring LP-WUS using LP-WUR:

[0116] ■ For example, when the serving (or camped) cell measurement value measured by the terminal is greater than any threshold value included in the above-mentioned setting signal

[0117] ■ For example, if the serving (or camped) cell measurement value measured by the terminal via MR or LR or (MR and LR) is greater than any threshold value included in the above-mentioned setting signal

[0118] ■ For example, if the terminal's mobility (the difference in measurements) inferred from serving (or camped) cell measurements taken at different times via MR or LR or (MR and LR) is smaller than a certain threshold value

[0119] - An exit condition that starts monitoring the LP-WUS corresponding to the above entry condition that the terminal starts monitoring the LP-WUS using LP-WUR:

[0120] ■ For example, if the set entry conditions are not met

[0121] ■ For example, when setting a threshold value different from the entry condition for the exit condition

[0122] - Resource information for the terminal to measure downlink LP-WUS

[0123] ■ Frequency Information: Center frequency information, frequency ID information that identifies the center frequency

[0124] ■ Time Information: Period information, LP-WUS reception time duration information, time offset information

[0125] - The LP-WUS configuration information of the terminal may include information such as a list of base stations to which the terminal can transmit the LP-WUS signal, for example, a list of base station IDs or a list of tracking area IDs.

[0126] - The above LP-WUS configuration information may have different values ​​for each base station (gNB) or each cell, and may include each LP-WUS configuration information corresponding to one or more base stations (or cells) in the form of a list that matches the base station ID.

[0127] Terminals operating in Idle / Inactive mode may receive the signal of the operation of 3-7 from any base station (3-7) and, based on the LP-WUS settings within the signal, start LP-WUS monitoring (3-9) or operate the MR (3-3) in any sleep mode (3-8). The operation of 3-8 may be omitted depending on the MR state or decision of the terminal (3-1).

[0128] Additionally, terminals that support PEI while operating in Idle / Inactive mode can receive a signal of operation of 3-7 from any base station (3-7) and monitor and receive PEI based on the PEI setting within the signal (3-12).

[0129] In one embodiment, the LP-WUS setting and PEI setting are received simultaneously, and when terminals supporting PEI are performing LP-WUS monitoring (3-9), the LP-WUS is received (3-10), and if the MR (3-3) is operating in Sleep mode or is in a turned-off state, the MR (3-3) is woken up (3-11) to receive the PEI (3-12). The operation 3-11 may be omitted depending on the MR state of the terminal (3-1). At this time, if the subgroup of the terminal is specified in the PEI, an attempt is made to receive paging occasions, and if paging is transmitted from the base station (3-2), it can be received (3-13).

[0130] The above LP-WUS signal (3-10) can be used as a downlink signal that triggers the following operation.

[0131] 1. The downlink LP-WUS signal can be used as a signal to trigger the reception of network paging at subsequent paging occasions when received by an Idle / Inactive mode terminal.

[0132] A. To this end, the base station may transmit LP-WUS configuration information, including an indicator that informs the terminal to perform the above operation when it receives LP-WUS, to the terminal in advance via MR or LP-WUR.

[0133] 2. When an Idle / Inactive mode terminal receives a downlink LP-WUS signal, it can be used as a signal to trigger the reception of a PEI signal indicating that there is paging in the network during the subsequent Paging early indication (PEI) signal reception period.

[0134] A. To this end, the base station may transmit LP-WUS configuration information, including an indicator that informs the terminal to perform the above operation when it receives LP-WUS, to the terminal in advance via MR or LP-WUR.

[0135] In an embodiment like Fig. 3, the terminal (3-1) may save power by keeping the LP-WUR (3-4) turned on and monitoring the LP-WUS through resources set by the base station (3-2), and operating the MR (3-3) in sleep mode. Additionally, when the LP-WUS is received to receive paging from the network, the MR (3-3) is woken up, and additional power saving benefits may be obtained by additionally monitoring the PEI.

[0136] However, for a network that does not know whether a terminal (3-1) operating in Idle / Inactive mode is currently operating MR (3-3) in sleep mode and monitoring only LP-WUS, or whether it is keeping MR (3-3) awake because it does not meet the conditions, and which terminal supports PEI and wants to receive it, there is a burden of always transmitting LP-WUS signals and PEI signals to page a specific terminal.

[0137] In addition, in the case of a terminal that simultaneously supports PEI, which also supports subgrouping, even though there is an LP-WUS that supports subgrouping, there may be an unreasonable situation where the Paging Occasion is selected and Paging is attempted through two stages of subgrouping unnecessarily. Of course, if the subgroup size of the LP-WUS is sufficiently larger than the subgroup size of the PEI, the utility may arise by allowing only a subset of terminals selected for PEI among those awakened by the LP-WUS to monitor PO, thereby allowing fewer terminals to wake up and monitor PO through a two-stage selection process. However, since there may be terminals that do not monitor PEI, the base station cannot set the subgroup size of the LP-WUS to be infinitely large, and this utility is further reduced when the receiving subgroup size of the LP-WUS is similar to or equal to the subgroup size of the PEI. In such cases, power consumed by the terminal to wake up and receive PEI may be wasted, and the delay until PO monitoring is even increased.

[0138] In an embodiment similar to FIG. 3, the terminal (3-1) may receive the LP-WUS and / or PEI for a specific cell or a specific gNB from any gNB other than the gNB (3-2) that transmits the LP-WUS, such as an adjacent gNB or a gNB that performs a different role, such as a gNB that manages connections (signal of operation 3-7), receive the LP-WUS from the cell and the gNB (signal of operation 3-10), and perform subsequent operations.

[0139] FIG. 4 is a diagram illustrating an example of an LP-WUR status update transmission procedure transmitted by a base station to a terminal according to an embodiment of the present disclosure.

[0140] According to FIG. 4, the terminal (4-1) and the serving cell base station (4-2) each include a Main Radio (MR) (4-3, 4-5) which can be represented as 5G NR and a low-power radio, LP-WUR (4-4, 4-6).

[0141] When the base station (4-2) needs to wake up the MR (4-3) of the terminal (4-1), or needs the terminal (4-1) to receive Paging, or needs the terminal (4-1) to monitor the PDCCH, if the base station (4-2) transmits a transmittable downlink LP-WUS signal to notify this, the base station (4-2) can transmit a signal (e.g., LP-WUR configuration) to the terminal (4-1) that includes downlink LP-WUS monitoring start and end conditions, which include information for monitoring the LP-WUS, and resource configuration information (4-7). The signal may include instructions and settings that cause the terminal (4-1) to start or end a power saving operation using the LP-WUR, and accordingly, for the network to notify the base station (4-2) of this (4-7).

[0142] The above signal of operation 4-7 may be included in a broadcast signal transmitted by the base station (4-2) to the terminal (4-1), for example, in an MIB included in an SSB, or in any SIB. Alternatively, the above signal may be transmitted by being included in a Unicast signal transmitted by the base station (4-2) to the terminal (4-1), for example, in an RRC signal, a MAC signal, or a PHY signal.

[0143] The signal of the above 4-7 operation may include not only the LP-WUR related setting signal included in the signal of the 3-7 operation described in Fig. 3, but also at least one of the following information.

[0144] - Information related to update signals for notifying the network of the terminal's LP-WUS measurement status

[0145] ■ Conditions that trigger update signal transmission

[0146] ◆ When the terminal starts / stops LP-WUS measurement (when changed from the previous state)

[0147] ◆ When the terminal starts / stops measurement using MR(NR) (when changed from the previous state)

[0148] ◆ When the terminal's Serving (or camped) cell changes

[0149] The above conditions may be distinguished by indicators or event IDs (e.g., A1).

[0150] ■ Uplink resources to transmit update signals

[0151] ◆ When the Update signal is an MR signal

[0152] ● In the case of an update using a Random Access Channel (RACH), the terminal can notify the uplink that the terminal's status has changed by transmitting a Preamble (or Msg A in the form of Preamble + Data) through the MR RACH resource configured by the network.

[0153] ■ The above Preamble may be a preamble having a specific sequence number uniquely assigned to each terminal.

[0154] ■ The above Preamble may be a Preamble available to an unspecified number of users, and in this case, the terminal may indicate the terminal ID through subsequent transmitted data (Msg 3 in 4-step RACH, Msg 1 in 2-step RACH). Alternatively, the data may include an indicator indicating that the signal refers to a change in the terminal's LP-WUS monitoring status.

[0155] ● In the case of an Update using PUCCH other than the above, the terminal requests resource allocation from the network (Scheduling Request, SR) and, through this, receives uplink resources to transmit the Update signal.

[0156] ◆ When the Update signal is an LP-WUR signal

[0157] ● In the case of an Update using a resource capable of transmitting a Random Access Channel (RACH) or any Preamble (or a combination of Preamble and Data), the terminal can notify the uplink that the terminal's status has changed by transmitting the Preamble (or Preamble + Data) through a resource configured by the network.

[0158] ■ The above Preamble may be a preamble having a specific sequence number uniquely assigned to each terminal.

[0159] ■ The above Preamble may be a Preamble available to an unspecified number of users, and in this case, the terminal may indicate the terminal ID through subsequent transmitted data. Alternatively, the data may include an indicator that indicates that the signal refers to a change in the terminal's LP-WUS monitoring status.

[0160] ● In the case of an Update using an uplink data channel other than the above, the terminal can request resource allocation from the network (Scheduling Request, SR) and receive uplink resources through this to transmit an Update signal.

[0161] ● In addition, the channel may be a resource capable of transmitting a simple On-off pattern or any pre-set tone signal.

[0162] ■ The information to be included in the update signal transmission is as follows, and all or part of it may be transmitted. The types of information to be included and transmitted may be specified in the standard, or may be included in the signal (3-7) set by the network to the terminal.

[0163] ◆ Terminal ID

[0164] ◆ ID of the condition that triggered the terminal to send the corresponding update

[0165] ◆ Device status changed by update:

[0166] ● For example, a 1 bit indicating that it is toggled in the current state

[0167] ● For example, a 1-bit indicator indicating LP-WUS monitoring / non-monitoring

[0168] ■ 1 for monitoring, 0 for non-monitoring, or 0 for monitoring, 1 for non-monitoring

[0169] ◆ Timer value for the remaining time the terminal intends to maintain the state

[0170] - Update signal setting information may include information such as a list of base stations to which the terminal can transmit the update signal, for example, a list of base station IDs or a list of tracking area IDs.

[0171] - The above Update signal setting information may have different values ​​for each base station (gNB) or each cell, and may include each Update signal setting information corresponding to one or more base stations (or cells) in the form of a list that matches the base station ID.

[0172] The above Update signal may be transmitted by being included in a signal transmitted by the terminal (4-1) to the base station (4-2), for example, an RRC signal (RACH Msg3, MsgA), a MAC signal (MAC-CE), or a PHY signal (UCI, uplink control information).

[0173] Terminals receive a signal of the operation 4-7 from a base station and, based on the LP-WUS settings within the signal, may start LP-WUS monitoring (4-9) or operate the MR (4-3) in a sleep mode (4-8). The operation 4-8 may be omitted depending on the MR status of the terminal (4-1) or a decision of the terminal (4-1). At this time, according to this change in status, the terminal (4-1) may notify the base station (4-2) of the change in the LP-WUR status by transmitting an update signal (e.g., LP-WUR status update) (4-10).

[0174] Subsequently, the terminals receive a signal of the operation 4-7 from a base station and, based on the LP-WUS settings within the signal, stop LP-WUS monitoring if a specific condition is satisfied (4-12), or wake up the MR (4-3) to operate if the MR (4-3) is operating in Sleep mode or turned off (4-11). The operation 4-11 may be omitted depending on the MR status of the terminal (4-1) or the terminal's decision. At this time, according to this change in status, the terminal (4-1) may notify the base station (4-2) of the change in the LP-WUR status by transmitting an update signal (e.g., LP-WUR status update) (4-13).

[0175] The gNB (or cell) that transmits the signal (signal of operation 4-7) that sets the update signal for the terminal to transmit in order to update the setting for receiving the LP-WUS reception signal using the above LP-WUR and the LP-WUR state change of the terminal accordingly may be different from the gNB (or cell) that actually receives the LP-WUS or transmits the LP-WUR update through the terminal via the LP-WUR.

[0176] FIG. 5 is a diagram illustrating an embodiment in which a base station according to an embodiment of the present disclosure selectively transmits LP WUS and PEI to a terminal.

[0177] According to FIG. 5, the terminal (5-1, 5-3) and the serving cell base station (5-2) each include an MR (5-4, 5-6, 5-8) which can be represented as 5G NR and a low-power radio, LP-WUR (5-5, 5-7, 5-9). The base station (5-2) may transmit a signal (5-10) containing LP-WUS setting information and / or PEI setting information for terminals (5-1, 5-3) capable of using PEI and LP-WUS to set the signal to be received when the terminal (5-1, 5-3) performs a power saving operation using LP-WUR. The signal may be the same signal as the signal of operation 3-7 described in FIG. 3. Additionally, the signal may include a setting for the LP-WUR status update signal described in FIG. 4.

[0178] The signal of the above 5-10 operation may be included in a broadcast signal transmitted by the base station (5-2) to the terminal (5-1, 5-3), for example, in an MIB included in an SSB, or in any SIB. Alternatively, it may be transmitted by being included in a Unicast signal transmitted by the base station (5-2) to the terminal (5-1, 5-3), for example, in an RRC signal, MAC signal, or PHY signal.

[0179] Some terminals (5-1) receive a signal of the operation 5-10 from a base station (5-2) and, based on the LP-WUS setting in the signal, if a specific condition is satisfied, start LP-WUS monitoring (5-12) or operate the MR (5-4) in a sleep mode (5-11). The operation 5-11 may be omitted depending on the MR state of the terminal (5-1) or the decision of the terminal (5-1).

[0180] Some terminals (5-3) may not satisfy the conditions to start LP-WUS monitoring based on the signal of the above 5-10 operation and may continue to use MR (5-8) as is (5-13).

[0181] When the terminal (5-1) that started the above LP-WUS monitoring receives an LP-WUR status update signal from the base station (5-2) as shown in FIG. 4, it can transmit an LP-WUR update signal (e.g., LP-WUR status update) to the base station (5-2) accordingly (5-14).

[0182] By receiving or not receiving the LP-WUR Update signal transmitted by the terminals, the base station (5-2) can determine which terminal is currently able to receive the LP-WUR. Accordingly, the base station (5-2) can determine which signal to transmit to which terminal when it is necessary to transmit a paging signal to the terminals (5-15).

[0183] The base station (5-2) can reduce PEI transmission power by transmitting the LP-WUS to the terminal (5-1) that is monitoring the LP-WUS (5-16) and not transmitting the PEI (5-19). At this time, the terminal (5-1) that receives the LP-WUS and whose subgroup ID of the LP-WUS is mapped to the terminal's subgroup ID can wake up the MR module to a wake-up state if the MR module is in Deep Sleep or turned off (5-18) and receive paging according to the settings (5-21). The above operation 5-18 may be omitted depending on the MR state of the terminal (5-1) or the terminal's decision.

[0184] The base station (5-2) can reduce LP-WUS transmission power by not transmitting LP-WUS to terminals (5-3) that are not monitoring LP-WUS (5-17) and transmitting PEI (5-20). At this time, terminals (5-3) that receive PEI and whose subgroup ID of the PEI is mapped to the terminal's subgroup ID can receive paging according to the settings (5-22).

[0185] In one embodiment, the base station (5-2) may transmit a downlink setting signal (signal of operation 5-10) that includes an indicator indicating that if the terminal has transmitted an LP-WUS Status Update and has received an LP-WUS, it will not transmit (or ignore) the PEI.

[0186] Alternatively, in one embodiment, the base station (5-2) may transmit a downlink setting signal (signal of operation 5-10) that includes an indicator indicating that the terminal will not transmit (or ignore) PEI when it receives LP-WUS.

[0187] A terminal that receives the above indicator can save unnecessary power waste by not attempting to receive PEI.

[0188] In one embodiment, the base station (5-2) may transmit a downlink setting signal (signal of operation 5-10) including an indicator that if the terminal has transmitted (or supports) an LP-WUS Status Update and is not monitoring the LP-WUS, it will not transmit (or ignore) the LP-WUS.

[0189] Alternatively, in one embodiment, the base station (5-2) may transmit a downlink setting signal (signal of operation 5-10) that includes an indicator indicating that if the terminal is not monitoring the LP-WUS, it will not transmit (or ignore) the LP-WUS.

[0190] The gNB (or cell) transmitting the downlink LP-WUS, PEI, and Update setting signals (5-10) may actually be different from the gNB (or cell) transmitting the LP-WUS and / or PEI that the terminal receives via LP-WUR, or receiving the LP-WUR update transmitted by the terminal.

[0191] FIG. 6 is a diagram illustrating an embodiment in which a base station according to an embodiment of the present disclosure selectively transmits an LP-WUS to a terminal.

[0192] According to FIG. 6, the terminal (6-1, 6-3) and the serving cell base station (6-2) each include an MR (6-4, 6-6, 6-8) which can be represented as 5G NR and a low-power radio, LP-WUR (6-5, 6-7, 6-9). The base station (6-2) may transmit a signal (6-10) containing LP-WUS configuration information for setting the signal to be received by the terminal when performing a power saving operation using LP-WUR for terminals (6-1, 6-3) capable of using LP-WUS. The signal may be the same signal as the signal described in FIG. 3 (signal of operation 3-7). Additionally, the signal may include a setting for the LP-WUR status update signal described in FIG. 4.

[0193] The signal of the above 6-10 operation may be included in a broadcast signal transmitted by the base station (6-2) to the terminal (6-1, 6-3), for example, an MIB included in an SSB, or any SIB. Alternatively, it may be transmitted by being included in a Unicast signal transmitted by the base station (6-2) to the terminal (6-1, 6-3), for example, an RRC signal, a MAC signal, or a PHY signal.

[0194] A terminal (6-1) receives a signal of the 6-10 operation from a base station (6-2) and, based on the LP-WUS settings within the signal, may start LP-WUS monitoring (6-12) or operate the MR (6-4) in a sleep mode (6-11). The 6-11 operation may be omitted depending on the MR state of the terminal (6-1) or a decision of the terminal (6-1).

[0195] Some terminals (6-3) may not satisfy the conditions to start LP-WUS monitoring based on the signal of the above 6-10 operation and may continue to use MR (6-8) as is (6-13).

[0196] When the terminal (6-1) that started the above LP-WUS monitoring receives an LP-WUR status update signal from the base station (6-2) as shown in FIG. 4, it can transmit an LP-WUR update signal (e.g., LP-WUR status update) to the base station (6-2) accordingly (6-14).

[0197] By receiving or not receiving the LP-WUR Update signal (6-14) transmitted by the terminals, the base station (6-2) can determine which terminals are currently able to receive the LP-WUR. Accordingly, the base station (6-2) can determine which signal to transmit to which terminal when it is necessary to transmit a paging signal to the terminals (6-15).

[0198] The base station (6-2) can transmit the LP-WUS to the terminal (6-1) that is monitoring the LP-WUS (6-16). At this time, the terminal (6-1) that receives the LP-WUS and whose subgroup ID of the LP-WUS is mapped to the terminal's subgroup ID can wake up the MR module to a wake-up state if the MR module is in Deep Sleep or turned off (6-18), and can receive paging or PDCCH according to the settings (6-19). The above operation 6-18 may be omitted depending on the MR state of the terminal (6-1) or the terminal's decision.

[0199] The base station (6-2) can reduce LP-WUS transmission power by not transmitting LP-WUS to terminals (6-3) that are not monitoring LP-WUS (6-17). Afterwards, terminals (6-3) can receive paging or PDCCH depending on the settings (6-20).

[0200] In one embodiment, the base station (6-2) may transmit a downlink setting signal (signal of operation 6-10) that includes an indicator indicating that if the terminal has transmitted (or supports) an LP-WUS Status Update and is not monitoring the LP-WUS, it will not transmit (or ignore) the LP-WUS.

[0201] Alternatively, in one embodiment, the base station (6-2) may transmit a downlink setting signal (signal of operation 6-10) that includes an indicator indicating that if the terminal is not monitoring the LP-WUS, it will not transmit (or ignore) the LP-WUS.

[0202] The gNB (or cell) transmitting the above downlink LP-WUS and Update setting signal (signal of operation 6-10) may actually be different from the gNB (or cell) that transmits the LP-WUS received by the terminal via LP-WUR or receives the LP-WUR update transmitted by the terminal.

[0203] The above terminal may be a terminal that operates in IDLE / Inactive mode and receives Paging, or a terminal that operates in Connected mode and receives PDCCH.

[0204] FIG. 7 is a diagram illustrating an embodiment in which a terminal according to an embodiment of the present disclosure receives a setting for uplink LP-WUS transmission from a base station and, if necessary, performs uplink LP-WUS transmission to the base station.

[0205] According to FIG. 7, the terminal (7-1) and the base station (7-2) each include an MR (7-3, 7-5) which can be represented as 5G NR and a low-power radio, LP-WUR (7-4, 7-6). The base station (7-2) can transmit a signal (e.g., LP-WUR configuration) containing configuration information for an uplink LP-WUS signal to request the base station (7-2) to set up a signal or resource required according to conditions to the terminal (7-1) in connection mode (7-7).

[0206] The above signal (signal of 7-7 operation) may be transmitted by being included in a Unicast signal transmitted by the base station (7-2) to a specific terminal (7-1), such as an RRC signal like RRC Release or RRC Reconfig, a MAC signal, or a PHY signal. Alternatively, the above signal of 7-7 operation may be included in a broadcast signal, such as an MIB included in an SSB, or in any SIB.

[0207] The above signal (signal of 7-7 operation) may include all or part of the following uplink LP-WUS configuration information:

[0208] - Scenario where a terminal triggers the transmission of an uplink LP-WUS using an LP-WUR (in the form of an indicator or bitmap):

[0209] ■ MR on-demand SSB transmission request

[0210] ■ MR on-demand SIB1 transmission request

[0211] ■ MR on-demand PRACH resource allocation (or activation) request

[0212] ■ Request MR Full on

[0213] ■ MR Scheduling Request (SR) allocation (or activation) request

[0214] - Conditions for a terminal to trigger the transmission of an uplink LP-WUS using an LP-WUR (in the form of an indicator or bitmap):

[0215] ■ For example, when traffic is generated from a terminal (Mobile Triggered Traffic)

[0216] ■ For example, when mobility occurs at the terminal and MR measurement of the corresponding cell is required

[0217] ■ For example, if the serving (or camped) cell measurement value measured by the terminal via MR or LR or (MR and LR) is smaller than any threshold value included in the above-mentioned setting signal

[0218] ■ For example, if the terminal's mobility (the difference in measurements) inferred from serving (or camped) cell measurements taken at different times via MR or LR or (MR and LR) is greater than a certain threshold value

[0219] ■ For example, when a timer set on the terminal expires

[0220] ◆ The corresponding timer can be set in the above signal 7-7.

[0221] The timer may start when the terminal receives a specific signal, such as SSB, SIB1, PDCCH, PDSCH, etc.

[0222] ◆ The timer may be updated when the terminal receives a specific signal, such as SSB, SIB1, PDCCH, PDSCH, etc.

[0223] ◆ The timer may be canceled or released when the terminal receives a specific signal, for example, any downlink reset signal transmitted by a base station. The signal may be the 7-7 signal mentioned above or any other RRC, MAC, or PHY-based signal.

[0224] - LP-WUR resource information for uplink LP-WUS transmission

[0225] ■ In the case of an uplink LP-WUS that uses a resource capable of transmitting a Random Access Channel (RACH) or any Preamble (or a Preamble and Data combined) signal, the terminal can transmit the Preamble (or Preamble + Data) through a resource configured by the network to notify the uplink that the terminal's status has changed.

[0226] ◆ The above Preamble may be a preamble having a specific sequence number uniquely assigned to each terminal.

[0227] ◆ The above Preamble may be a Preamble available to an unspecified number of users, and in this case, the terminal may indicate the terminal ID through subsequent transmitted data. Alternatively, the data may include an indicator indicating that the signal refers to a change in the terminal's LP-WUS monitoring status.

[0228] ■ In the case of an uplink LP-WUS using an uplink data channel other than the above, the terminal can request resource allocation from the network (Scheduling Request, SR) and receive uplink resources through this to transmit an uplink LP-WUS signal.

[0229] In addition, the channel may be a resource capable of transmitting a simple On-off pattern or any pre-set tone signal.

[0230] - The information to be included in the uplink LP-WUS signal transmission is as follows, and all or part of it may be transmitted. The types of information to be included and transmitted may be specified in the standard, or may be included in the signal (7-7) set by the network to the terminal.

[0231] ■ Terminal ID

[0232] ■ ID of the condition that triggered the terminal to transmit the corresponding uplink LP-WUS (explained above)

[0233] ■ ID of the base station signal / resource requested by the terminal through the corresponding uplink LP-WUS (as described above)

[0234] - The uplink LP-WUS configuration information of a base station may include information such as a list of base stations, for example, a list of base station IDs or a list of tracking area IDs.

[0235] - The above LP-WUS configuration information may have different values ​​for each base station (gNB) or each cell, and may include each LP-WUS configuration information corresponding to one or more base stations (or cells) in the form of a list that matches the base station ID.

[0236] The base station (7-2) can set up LP-WUS transmission for the terminal (7-1) and perform LP-WUS monitoring according to the setting (7-8).

[0237] When any uplink LP-WUS transmission trigger condition set in the signal (signal of operation 7-7) is satisfied (7-9), the terminal (7-1) can transmit an uplink LP-WUS using the set resources (7-10). The base station (7-2) can receive the LP-WUS transmitted from the terminal (7-1) based on LP-WUS monitoring (7-8) (7-11).

[0238] A base station (7-2) that receives an LP-WUS can wake up the MR module to a wake-up state if the MR module is in Deep Sleep or turned off (7-11), and, depending on the request of the LP-WUS or the decision of the base station (7-2), transmit downlink signals such as SSB, SIB1, PDCCH, etc., or set and activate resources such as PRACH or SR (7-12). The above 7-11 operation may be omitted depending on the MR state of the base station (7-2) or the decision of the base station (7-2).

[0239] The gNB (or cell) transmitting the uplink LP-WUS setting signal (signal of operation 7-7) may actually be different from the gNB (or cell) receiving the uplink LP-WUS transmitted by the terminal (7-1) via LP-WUR.

[0240] The above terminal (7-1) may be a terminal that operates in IDLE / Inactive mode and receives Paging, or a terminal that operates in Connected mode and receives PDCCH.

[0241] FIG. 8 is a diagram illustrating an embodiment in which a terminal according to an embodiment of the present disclosure receives a setting for uplink LP-WUS transmission from a base station and, if necessary, performs uplink LP-WUS transmission to the base station.

[0242] According to FIG. 8, the terminal (8-1) and the base station (8-2) each include an MR (8-3, 8-5) which can be represented as 5G NR and a low-power radio, LP-WUR (8-4, 8-6). The base station (8-2) can transmit a signal containing configuration information for an uplink LP-WUS signal to the terminal (8-1) in connection mode to request the base station (8-2) to set up a signal or resource required according to the conditions (8-7).

[0243] The above signal (signal of operation 8-7) may be transmitted by being included in a Unicast signal transmitted by a base station to a specific terminal (8-1), such as an RRC signal like RRC Release or RRC Reconfig, a MAC signal, or a PHY signal. Alternatively, the above signal (signal of operation 8-7) may be included in a broadcast signal, such as an MIB included in an SSB, or in any SIB.

[0244] The above signal (signal of operation 8-7) may include all or part of the uplink LP-WUS configuration information included in the signal (signal of operation 7-7) described in FIG. 7. Additionally, the above signal (signal of operation 8-7) may include a configuration for an LP-WUR Status Update signal that the base station (8-2) can transmit to the terminal (8-1).

[0245] The setting may include all or part of the following information:

[0246] - Information related to update signals to notify the terminal of changes in the base station's LP-WUS measurement status

[0247] ■ Conditions that trigger downlink update signal transmission

[0248] ◆ If LP-WUS monitoring is interrupted in the LP-WUS monitoring section included within the LP-WUS configuration information contained in Signal 8-7 by the base station

[0249] ◆ When LP-WUS monitoring starts in the LP-WUS non-monitoring section included in the LP-WUS configuration information contained in Signal 8-7 by the base station

[0250] ■ Downlink resources to transmit update signals

[0251] ◆ When the Update signal is an MR signal

[0252] ● Unicast signals transmitted by a base station to a terminal, which specify the terminal, such as RRC Release, RRC Reconfig, etc., may be transmitted included within RRC signals, MAC signals, or PHY signals.

[0253] ● Or it may be included in a broadcast signal, for example, a master information block (MIB) contained within an SSB, or any system information block (SIB).

[0254] ◆ When the Update signal is an LP-WUR signal

[0255] ● Unicast signals transmitted by a base station to a terminal, which specify the terminal, such as RRC Release, RRC Reconfig, etc., may be transmitted included within RRC signals, MAC signals, or PHY signals.

[0256] ● Or it may be included in a broadcast signal, for example, a master information block (MIB) contained within an SSB, or any system information block (SIB).

[0257] ● In addition, the channel may be a resource capable of transmitting a simple On-off pattern or any pre-set tone signal.

[0258] ■ The information to be included in the update signal transmission is as follows, and all or part of it may be transmitted. The types of information to be included and transmitted may be specified in the standard, or may be included in the signal (3-7) set by the network to the terminal.

[0259] ◆ Base Station ID

[0260] ◆ Cell ID

[0261] ◆ Tracking Area ID

[0262] ◆ Base station status changed by update:

[0263] ● For example, a 1 bit indicating that it is toggled in the current state

[0264] ● For example, a 1-bit indicator indicating LP-WUS monitoring / non-monitoring

[0265] ■ 1 for monitoring, 0 for non-monitoring, or 0 for monitoring, 1 for non-monitoring

[0266] ◆ ID of the condition that triggered the base station to transmit the corresponding update

[0267] ◆ The time when the base station starts the corresponding state change,

[0268] ● Or the timer value for the remaining time until the start time

[0269] ◆ Timer value for the remaining time the base station intends to maintain the state

[0270] - Downlink Update signal setting information may include information such as a list of base stations where the terminal can receive the update signal, for example, a list of base station IDs or a list of tracking area IDs.

[0271] - The above Update signal setting information may have different values ​​for each base station (gNB) or each cell, and may include each Update signal setting information corresponding to one or more base stations (or cells) in the form of a list that matches the base station ID.

[0272] The base station (8-2) performs operations as set in the above signal (8-7 operation signal), and when a change occurs in the LP-WUS monitoring status (8-8), it can provide information about this to the terminal (8-1) (8-9, 8-10).

[0273] At this time, when the base station (8-2) starts LP-WUS monitoring, the Update signal (8-9) via MR (8-5) can be transmitted before monitoring starts. This is to prepare to put the MRs (8-3, 8-5) of the base station (8-2) and the terminal (8-1) into sleep mode, so that the terminal (8-1) that receives the Update signal can also operate the MR (8-3) in sleep mode.

[0274] Additionally, when the base station (8-2) terminates LP-WUS monitoring, the Update signal (8-10) via LR (8-6) may be transmitted before the monitoring is terminated. This is to prepare the LR (8-4, 8-6) of the base station (8-2) and the terminal (8-1) to be put into sleep mode, so that the terminal (8-1) that receives the Update signal can also operate the LR (8-4) in sleep mode.

[0275] The signal (signal of operation 8-09, 8-10) may be transmitted by being included in a Unicast signal transmitted by the base station (8-2) to a specific terminal (8-1), such as an RRC signal like RRC Release or RRC Reconfig, a MAC signal, or a PHY signal. Alternatively, the signal (signal of operation 8-09, 8-10) may be included in a broadcast signal, such as an MIB included in an SSB, or in any SIB.

[0276] Subsequently, if the base station (8-2) announces the time to start using the change of settings through the update signal, it operates with the changed settings and state at that specific time.

[0277] If the time to start using the change in the setting is not announced via the update signal above, the base station (8-2) operates immediately after transmitting the update signal with the changed setting and state.

[0278] When any uplink LP-WUS transmission trigger condition set in the above signal (signal of operation 8-7) is satisfied (8-11), the terminal (8-1) can transmit an uplink LP-WUS using the set resources (8-12).

[0279] The base station (8-2) that receives the LP-WUS can wake up the MR module to a wake-up state if the MR module is in Deep Sleep or turned off (8-13), and, depending on the request of the LP-WUS or the decision of the base station (8-2), transmit downlink signals such as SSB, SIB1, PDCCH, etc., or set and activate resources such as PRACH or SR (8-14). The above operation 8-13 may be omitted depending on the MR state of the base station (8-2) or the decision of the base station (8-2).

[0280] The gNB (or cell) transmitting the uplink LP-WUS setting signal (signal of operation 8-7) may actually be different from the gNB (or cell) receiving the uplink LP-WUS transmitted by the terminal (8-1) via the LP-WUR.

[0281] The above terminal (8-1) may be a terminal that operates in IDLE / Inactive mode and receives Paging, or a terminal that operates in Connected mode and receives PDCCH.

[0282] FIG. 9 is a diagram illustrating an embodiment in which a terminal according to an embodiment of the present disclosure receives a signal from a base station to change the setting of an LP-WUS cycle and performs a change of the cycle accordingly.

[0283] According to FIG. 9, the terminal (9-1) and the base station (9-2) each include a Main Radio (MR) (9-3, 9-5) which can be represented as 5G NR and a low-power radio, LP-WUR (9-4, 9-6). The base station (9-2) can transmit a signal containing configuration information for uplink and downlink LP-WUS signals to the terminal (9-1) in connection mode to request the base station to set up signals or resources required according to conditions (9-7).

[0284] The above signal (signal of operation 9-7) may be transmitted by being included in a Unicast signal transmitted by the base station (9-2) to a specific terminal (9-1), such as an RRC signal like RRC Release or RRC Reconfig, a MAC signal, or a PHY signal. Alternatively, the above signal (signal of operation 9-7) may be included in a broadcast signal, such as an MIB included in an SSB, or in any SIB.

[0285] The above signal (signal of operation 9-7) may include all or part of the downlink and uplink LP-WUS configuration information included in the signals described in FIG. 3 and FIG. 7 (signal of operation 3-7 and signal of operation 7-7).

[0286] The base station (9-2) performs operations as set in the above signal (9-7 operation signal), and when a change occurs in any setting, such as the uplink or downlink LP-WUS monitoring cycle (9-8), it can provide information about this to the terminal (9-1) (9-9, 9-10). The base station (9-2) can transmit the update LP-WUS monitoring configuration and / or the update LP-WUS monitoring configuration to the terminal (9-1).

[0287] At this time, when the uplink or downlink LP-WUS monitoring cycle of the base station (9-2) changes, the change setting signal (9-9) via the MR (9-5) can be transmitted before the uplink or downlink LP-WUS monitoring starts. This is to prepare to put the MRs (9-3, 9-5) of the base station (9-2) and the terminal (9-1) into sleep mode, so that the terminal (9-1) that receives the update signal can also operate the MR (9-3) in sleep mode.

[0288] Additionally, when the uplink or downlink LP-WUS monitoring cycle changes, the base station (9-2) may transmit a change setting signal (9-10) via LR before the terminal (9-1) terminates LP-WUS monitoring. This is to prepare to put the LRs (9-4, 9-6) of the base station (9-2) and the terminal (9-1) into sleep mode, so that the terminal (9-1) that receives the update signal can also operate the LRs (9-4, 9-6) in sleep mode.

[0289] The signal (the signal of the 9-9 operation and / or the signal of the 9-10 operation) may be transmitted by being included in a Unicast signal transmitted by the base station (9-2) to the terminal (9-1), such as an RRC signal like RRC Release or RRC Reconfig, a MAC signal, or a PHY signal. Alternatively, the signal (the signal of the 9-9 operation and / or the signal of the 9-10 operation) may be included in a broadcast signal, such as an MIB included in an SSB, or in any SIB.

[0290] The above signals (signals of 9-9 operation and / or signals of 9-10 operation) may contain some or all of the following information.

[0291] - All of the LP-WUS settings configured in the above signal (signal of operation 9-7)

[0292] ■ Part or all of the downlink LP-WUS configuration information included in the signal of FIG. 3 (signal of operation 3-7) that was set in the above signal (signal of operation 9-7).

[0293] ■ Part or all of the uplink LP-WUS configuration information included in the signal of FIG. 7 (signal of operation 7-7) that was set in the above signal (signal of operation 9-7).

[0294] - Part of any LP-WUS configuration set in the above signal (signal of operation 9-7)

[0295] ■ Includes only the parameters for which some or all of the downlink LP-WUS configuration information included in the signal of Fig. 3 (signal of operation 3-7), which was set in the above signal (signal of operation 9-7), has been changed.

[0296] ■ Includes only the parameters for which some or all of the uplink LP-WUS configuration information included in the signal of Fig. 7 (signal of operation 7-7) that was set in the above signal (signal of operation 9-7) has been changed

[0297] The above change allows setting an entirely new value while using the same resources (number of bits) as the existing value.

[0298] ◆ The above change can be set as an offset value that displays the changed value by adding it to the existing value.

[0299] - An indicator of whether the configuration change message is changing the uplink LP-WUS or the downlink LP-WUS.

[0300] In one embodiment, the setting (signal of operation 9-7, signal of operation 9-9, or signal of operation 9-10) may be used by the base station (9-2) to change the DRX cycle of the terminal (9-1) and to match the base station's LP-WUS monitoring cycle with the terminal's DRX cycle.

[0301] To this end, the base station (9-2) may transmit an indicator in the signal (signal of operation 9-7, signal of operation 9-9, or signal of operation 9-10) that instructs the terminal (9-1) to match the terminal's DRX cycle with the base station's LP-WUS monitoring cycle.

[0302] Subsequently, if the base station (9-2) announces the time to start using the change of settings through the update signal, it operates with the changed settings and state at that specific time.

[0303] If the time to start using the setting change is not announced via the above update signal, the base station (9-2) operates immediately with the changed setting and state after transmitting the above update signal.

[0304] FIG. 10 is a drawing illustrating the structure of a base station according to one embodiment of the present disclosure.

[0305] Referring to FIG. 10, the base station may include a transceiver (10-10), a control unit (10-20), and a storage unit (10-30). The transceiver (10-10), the control unit (10-20), and the storage unit (10-30) may operate according to the communication method of the base station described above. Additionally, a network device may also correspond to the structure of the base station. However, the components of the base station are not limited to the examples described above. For example, the base station may include more components or fewer components than the components described above. For example, the base station may include a transceiver (10-10) and a control unit (10-20). Furthermore, the transceiver (10-10), the control unit (10-20), and the storage unit (10-30) may be implemented in the form of a single chip.

[0306] The transceiver unit (10-10) is a collective term for the receiver unit and the transmitter unit of a base station and can transmit and receive signals with a terminal, another base station, or another network device. At this time, the signals transmitted and received may include control information and data. For example, the transceiver unit (10-10) can transmit system information to a terminal and can transmit a synchronization signal or a reference signal. To this end, the transceiver unit (10-10) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver unit (10-10), and the components of the transceiver unit (10-10) are not limited to an RF transmitter and an RF receiver. The transceiver unit (10-10) may include a wired / wireless transceiver unit and may include various configurations for transmitting and receiving signals. Additionally, the transceiver (10-10) can receive a signal through a communication channel (e.g., a wireless channel) and output it to a control unit, and transmit the signal output from the control unit (10-20) through the communication channel. Additionally, the transceiver (10-10) can receive a communication signal and output it to a processor, and transmit the signal output from the processor to a terminal, another base station, or another entity through a wired or wireless network.

[0307] The storage unit (10-30) can store programs and data necessary for the operation of the base station. Additionally, the storage unit (10-30) can store control information or data included in signals obtained from the base station. The storage unit (10-30) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the storage unit (10-30) can store at least one of information transmitted and received through the transmission and reception unit (10-10) and information generated through the control unit (10-20).

[0308] In the present disclosure, the control unit (10-20) may be defined as a circuit or an 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 applications. The control unit (10-20) may control the overall operation of a base station according to an embodiment proposed in the present disclosure. For example, the control unit (10-20) may control the signal flow between each block to perform operations according to the flowchart described above.

[0309] FIG. 11 is a drawing illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0310] Referring to FIG. 11, the terminal may include a transceiver (11-10), a control unit (11-20), and a storage unit (11-30). The transceiver (11-10), the control unit (11-20), and the storage unit (11-30) 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 components or fewer components than the components described above. For example, the terminal may include a transceiver (11-10) and a control unit (11-20). In addition, the transceiver (11-10), the control unit (11-20), and the storage unit (11-30) may be implemented in the form of a single chip.

[0311] The transceiver (11-10) is a collective term for the receiving unit and the transmitting unit of a terminal, and can transmit and receive signals with a base station, another terminal, or a network entity. The signals transmitted and received with the base station may include control information and data. For example, the transceiver (11-10) can receive system information from the base station and can receive synchronization signals or reference signals. To this end, the transceiver (11-10) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver (11-10), and the components of the transceiver (11-10) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (11-10) may include a wired / wireless transceiver and may include various configurations for transmitting and receiving signals. Additionally, the transceiver (11-10) can receive a signal through a wireless channel and output it to a control unit (11-20), and transmit the signal output from the control unit (11-20) through a wireless channel. Additionally, the transceiver (11-10) can receive a communication signal and output it to a processor, and transmit the signal output from the processor to a network entity through a wired or wireless network.

[0312] The storage unit (11-30) can store programs and data necessary for the operation of the terminal. Additionally, the memory can store control information or data included in signals obtained from the terminal. The storage unit (11-30) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD.

[0313] In the present disclosure, the control unit (11-20) may be defined as a circuit or an 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 applications. The control unit (11-20) may control the overall operation of the terminal according to the embodiment proposed in the present disclosure. For example, the control unit (11-20) may control the signal flow between each block to perform operations according to the flowchart described above.

[0314] 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.

[0315] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present invention.

[0316] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0317] In addition, the above program may be stored on an attachable storage device that can be accessed via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present invention through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present invention.

[0318] In the specific embodiments of the present disclosure described above, the components included in the invention are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present invention is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, or even if a component is expressed in the singular form, it may be composed of a plural form.

[0319] Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, it is understood that various modifications are possible within 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 by the claims set forth below as well as equivalents thereof.

Claims

1. A method performed by a terminal in a wireless communication system, A step of receiving a first message from a base station containing configuration information related to LP-WUS (low power - wake up signal); A step of determining the monitoring of the LP-WUS based on the above LP-WUS related configuration information; A step of transmitting a second message to the base station containing status information of the LP-WUR (low power - wake up radio) of the terminal based on monitoring of the LP-WUS; and The method includes the step of receiving the LP-WUS for the MR (main radio) of the terminal from the base station, A method in which, if the above terminal is monitoring LP-WUS, the terminal does not attempt to receive PEI (paging early indication).

2. In Paragraph 1, The method includes the step of receiving a third message from the base station that includes status information of the LP-WUR of the base station, and If the status information of the LP-WUR of the base station is for the start of LP-WUS monitoring, the third message is transmitted through the MR of the base station, and, If the status information of the LR-WUR of the base station is for the termination of LP-WUS monitoring, the third message is transmitted through the LP-WUR of the base station.

3. In Paragraph 2, It includes the step of transmitting an uplink LP-WUS to the base station based on the status information of the LP-WUR of the base station, The above uplink LP-WUS is a method for directing at least one of the transmission of a synchronization signal, the transmission of system information, the allocation of a random access resource (random access channel occasion), or the allocation of an uplink transmission resource.

4. In Paragraph 1, The first message above includes an indicator that indicates that the terminal does not receive the PEI when it receives the LP-WUS, and The above second message is transmitted via the above LP-WUR, and, A method in which the LP-WUR of the above terminal is part of the MR of the above terminal.

5. In a method performed by a base station in a wireless communication system, A step of transmitting a first message containing LP-WUS (low power - wake up signal) related configuration information to a terminal; A step of receiving a second message from the terminal containing status information of the LP-WUR (low power - wake up radio) of the terminal based on the above LP-WUS related configuration information; A step of determining the use of LP-WUS or PEI for the terminal based on the status information of LP-WUR of the terminal; and If the status information of the LP-WUR of the terminal indicates monitoring of the LP-WUS, the method includes the step of transmitting the LP-WUS for the MR (main radio) of the terminal to the terminal. A method in which, when the status information of the LP-WUR of the above terminal instructs the monitoring of the LP-WUS, a PEI (paging early indication) for the above terminal is not transmitted.

6. In Paragraph 5, The method includes the step of transmitting a third message containing status information of the LP-WUR of the base station to the terminal. If the status information of the LP-WUR of the base station is for the start of LP-WUS monitoring, the third message is transmitted through the MR of the base station, and, If the status information of the LR-WUR of the base station is for the termination of LP-WUS monitoring, the third message is transmitted through the LP-WUR of the base station.

7. In Paragraph 6, The method includes the step of receiving an uplink LP-WUS from the terminal based on the status information of the LP-WUR of the base station, The above uplink LP-WUS is a method for directing at least one of the transmission of a synchronization signal, the transmission of system information, the allocation of a random access resource (random access channel occasion), or the allocation of an uplink transmission resource.

8. In Paragraph 5, The first message above includes an indicator that indicates that the terminal does not receive the PEI when it receives the LP-WUS, and The above second message is transmitted via the above LP-WUR, and, A method in which the LP-WUR of the above terminal is part of the MR of the above terminal.

9. In a terminal of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and Connected to communicate with at least one processor and capable of executing individually or in any combination of the at least one processor, the terminal: Receive a first message from a base station containing configuration information related to LP-WUS (low power - wake up signal), and Based on the above LP-WUS related configuration information, the monitoring of the LP-WUS is determined, and Based on the monitoring of the above LP-WUS, a second message including status information of the terminal's LP-WUR (low power - wake up radio) is transmitted to the base station, and A memory storing a command to receive the LP-WUS for the terminal's MR (main radio) from the base station; and If the above terminal is monitoring LP-WUS, the terminal is a terminal that does not attempt to receive PEI (paging early indication).

10. In Paragraph 9, The above memory stores an instruction to receive a third message from the base station that includes status information of the LP-WUR of the base station, and If the status information of the LP-WUR of the base station is for the start of LP-WUS monitoring, the third message is transmitted through the MR of the base station, and, If the status information of the LR-WUR of the base station is for the termination of LP-WUS monitoring, the third message is a terminal transmitted through the LP-WUR of the base station.

11. In Paragraph 10, The above memory stores a command to transmit an uplink LP-WUS to the base station based on the status information of the LP-WUR of the base station, and, The above uplink LP-WUS is a terminal that directs at least one of the transmission of a synchronization signal, the transmission of system information, the allocation of a random access channel occasion, or the allocation of an uplink transmission resource.

12. In Paragraph 9, The first message above includes an indicator that indicates that the terminal does not receive the PEI when it receives the LP-WUS, and The above second message is transmitted via the above LP-WUR, and, The LP-WUR of the above terminal is a terminal that is part of the MR of the above terminal.

13. In a base station of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and Connected to communicate with at least one processor and capable of executing individually or in any combination of the at least one processor, the base station: Transmits a first message containing configuration information related to LP-WUS (low power - wake up signal) to a terminal, and Based on the above LP-WUS related configuration information, a second message including status information of the LP-WUR (low power - wake up radio) of the terminal is received from the terminal, and Based on the status information of the LP-WUR of the terminal, determine the use of LP-WUS or PEI for the terminal, and It includes a memory that stores a command to transmit the LP-WUS for the MR (main radio) of the terminal to the terminal when the status information of the LP-WUR of the terminal instructs monitoring of the LP-WUS; A base station in which PEI (paging early indication) for the terminal is not transmitted when the status information of the LP-WUR of the terminal instructs the monitoring of the LP-WUS.

14. In Paragraph 13, The above memory includes a command to transmit a third message containing status information of the LP-WUR of the base station to the terminal, and If the status information of the LP-WUR of the base station is for the start of LP-WUS monitoring, the third message is transmitted through the MR of the base station, and, If the status information of the LR-WUR of the base station is for the termination of LP-WUS monitoring, the third message is a base station transmitted through the LP-WUR of the base station.

15. In Paragraph 14, The above memory includes a command to receive an uplink LP-WUS from the terminal based on the status information of the LP-WUR of the base station, and The above uplink LP-WUS directs at least one of the transmission of a synchronization signal, the transmission of system information, the allocation of a random access channel occasion, or the allocation of an uplink transmission resource, and The first message above includes an indicator that indicates that the terminal does not receive the PEI when it receives the LP-WUS, and The above second message is transmitted via the above LP-WUR, and, The LP-WUR of the above base station is a base station that is part of the MR of the above base station.

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