Method and apparatus for cell reselection procedure performed by terminal equipped with low power wake-up receiver, in next generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Disclosed are a method and an apparatus for supporting a cell reselection operation performed by a terminal equipped with a main radio and a low-power wake-up receiver.

Description

Method and apparatus for a terminal equipped with a low-power wake-up receiver to perform a cell reselection procedure in a next-generation mobile communication system

[0001] The present disclosure relates to a method and apparatus for supporting cell reselection operation of a terminal equipped with a main radio and a low-power wake-up receiver.

[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 Orbital Angular Momentum (OAM); 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 Artificial Intelligence (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, a terminal applying the above-described next-generation mobile communication system is equipped with a Main Radio (MR) and a Low Power Wake-Up Receiver (LR), and can perform communication operations by selectively using either one depending on the situation. For example, the terminal can control the LR, which consumes less power, to use the LR and turn off the MR under certain conditions, or to have the LR perform measurements instead of the MR. Here, the frequency band supported by the MR and the frequency band supported by the LR may be the same or different.

[0009] One objective of the present disclosure is to provide a method for determining a cell reselection priority by considering the frequency bands supported by the MR and LR, respectively, when performing a cell reselection operation in a terminal equipped with MR and LR.

[0010] A method of a terminal in a wireless communication system according to an example of the present disclosure for solving the above-mentioned problems comprises: receiving a radio resource control (RRC) release message from a base station; receiving system information including cell reselection information for first frequencies from the base station; checking whether information related to a low power-wake-up signal (LP-WUS) provided at a second frequency is set for each of the first frequencies based on the cell reselection information; and determining a cell reselection priority for the first frequencies based on the checking, wherein the second frequency may be set in the same frequency band as the first frequencies.

[0011] Additionally, in a method of a base station in a wireless communication system according to one example of the present disclosure, the method comprises the steps of: transmitting a radio resource control (RRC) release message to a terminal; and transmitting system information to the terminal that includes cell reselection information for first frequencies, wherein the cell reselection information includes information related to a low power-wake-up signal (LP-WUS) provided at a second frequency for at least one of the first frequencies, and the second frequency may be set in the same frequency band as the first frequencies.

[0012] Additionally, in a wireless communication system according to one example of the present disclosure, a terminal comprises: a transceiver; and a control unit that controls the transceiver to receive a radio resource control (RRC) release message from a base station, and controls the transceiver to receive system information including cell reselection information for first frequencies from the base station, and based on the cell reselection information, checks whether information related to a low power-wake-up signal (LP-WUS) provided at a second frequency is set for each of the first frequencies, and based on the checks, determines a cell reselection priority for the first frequencies, wherein the second frequency may be set in the same frequency band as the first frequencies.

[0013] In addition, in a wireless communication system according to one example of the present disclosure, a base station comprises: a transceiver; and a control unit that controls the transceiver to transmit a radio resource control (RRC) release message to a terminal, and controls the transceiver to transmit system information including cell reselection information for first frequencies to the terminal, wherein the cell reselection information includes information related to a low power-wake-up signal (LP-WUS) provided at a second frequency for at least one of the first frequencies, and the second frequency may be set in the same frequency band as the first frequencies.

[0014] According to one embodiment of the present disclosure, when a terminal equipped with MR and LR for power saving purposes performs a cell reselection operation, there is an effect of being able to appropriately determine the cell reselection priority.

[0015] FIG. 1 is a diagram illustrating the structure of a next-generation mobile communication system according to one embodiment of the present invention.

[0016] FIG. 2 is a diagram showing the wireless protocol structure of a next-generation mobile communication system according to one embodiment of the present invention.

[0017] FIG. 3 is a diagram showing a terminal in an RRC idle mode (RRC_IDLE) or RRC disabled state (RRC_INACTIVE) in a next-generation mobile communication system according to an embodiment of the present invention performing a cell reselection evaluation procedure.

[0018] FIG. 4 is a diagram illustrating a method in which a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention reports a band list supported by the low-power wake-up receiver to a base station.

[0019] FIG. 5 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0020] FIG. 6 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0021] FIG. 7 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0022] FIG. 8 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0023] FIG. 9 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0024] FIG. 10 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0025] FIG. 11 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0026] FIG. 12 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0027] FIG. 13 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present invention determines cell reselection priority setting information.

[0028] FIG. 14 is a flowchart of a cell capable of transmitting a low-power wake-up in a next-generation mobile communication system according to an embodiment of the present invention, transmitting an RRC disconnection message or broadcasting system information.

[0029] FIG. 15 is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present invention.

[0030] FIG. 16 is a block diagram showing the configuration of an NR base station according to one embodiment of the present invention.

[0031] The operating principle of the present invention will be described in detail below with reference to the attached drawings. In describing the present invention below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions might unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0032] In the following description of the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the invention. Embodiments of the present invention will be described below with reference to the attached drawings.

[0033] 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 invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0034] For convenience of explanation, the present invention uses terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, the present invention is not limited by the above terms and names and can be applied equally to systems conforming to other standards. In the present invention, eNB may be used interchangeably with gNB for convenience of explanation. That is, a base station described as eNB may represent a gNB.

[0035] FIG. 1 is a diagram illustrating the structure of a next-generation mobile communication system according to one embodiment of the present invention.

[0036] Referring to FIG. 1, as illustrated, the wireless access network of a next-generation mobile communication system (hereinafter NR or 5G) consists of a next-generation base station (New Radio Node B, hereinafter NR gNB or NR base station) (1a-10) and an NR CN (1a-05, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal) (1a-15) connects to an external network through the NR gNB (1a-10) and the NR CN (1a-05).

[0037] In FIG. 1, the NR gNB (1a-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (1a-15) via a wireless channel and can provide superior service compared to the existing Node B. In next-generation mobile communication systems, since all user traffic is serviced through a shared channel, a device is required to collect state information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling, and this is handled by the NR NB (1a-10). A single NR gNB typically controls multiple cells. To achieve ultra-high-speed data transmission compared to current LTE, it can have a maximum bandwidth greater than the existing maximum bandwidth, and additionally, beamforming technology can be incorporated by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as the wireless access technology. In addition, an Adaptive Modulation & Coding (hereinafter referred to as AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal.

[0038] The NR CN (1a-05) performs functions such as mobility support, bearer configuration, and QoS (quality of service) configuration. The NR CN (1a-05) is a device responsible for various control functions as well as mobility management functions for terminals, and is connected to multiple base stations. In addition, the next-generation mobile communication system can be interoperable with existing LTE systems, and the NR CN (1a-05) is connected to the MME (1a-25) via a network interface. The MME is connected to the existing base station eNB (1a-30).

[0039] FIG. 2 is a diagram showing the wireless protocol structure of a next-generation mobile communication system according to one embodiment of the present invention.

[0040] Referring to FIG. 2, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (service data adaptation protocol) (1b-01, 1b-45), NR PDCP (packet data convergence protocol) (1b-05, 1b-40), NR RLC (radio link control) (1b-10, 1b-35), and NR MAC (medium access control) (1b-15, 1b-30) at the terminal and the NR base station, respectively.

[0041] The main functions of NR SDAP (1b-01, 1b-45) may include some of the following functions.

[0042] User data transfer function (transfer of user plane data)

[0043] Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0044] Marking QoS flow ID in both DL and UL packets for uplink and downlink

[0045] A function that maps reflective QoS flow to the data bearer for the uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0046] Regarding the SDAP layer device, the terminal may receive a radio resource control (RRC) message indicating whether to use the header of the SDAP layer device or the functions of the SDAP layer device for each PDCP layer device, bearer, or logical channel. If the SDAP header is configured, the terminal may be instructed to update or reset the mapping information for the uplink and downlink QoS flows and data bearers using the 1-bit indicators for NAS (non-access stratum) QoS reflection (NAS reflective QoS) and AS (access stratum) QoS reflection (AS reflective QoS) of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used for data processing priority, scheduling information, etc., to support smooth service.

[0047] The main functions of NR PDCP (1b-05, 1b-40) may include some of the following functions.

[0048] Header compression and decompression (ROHC only)

[0049] - User data transfer function (Transfer of user data)

[0050] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0051] - Out-of-sequence delivery of upper layer PDUs

[0052] - Reordering function (PDCP PDU reordering for reception)

[0053] - Duplicate detection function (Duplicate detection of lower layer SDUs)

[0054] - Retransmission of PDCP SDUs

[0055] - Encryption and decryption functions (Ciphering and deciphering)

[0056] - Timer-based SDU discard in uplink.

[0057] In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or a function of transmitting immediately without considering the order, may include a function of recording lost PDCP PDUs by reordering, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0058] The main functions of NR RLC(1b-10, 1b-35) may include some of the following functions.

[0059] - Data transfer function (Transfer of upper layer PDUs)

[0060] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0061] - Out-of-sequence delivery of upper layer PDUs

[0062] - ARQ function (Error Correction through ARQ)

[0063] - Concatenation, segmentation, and reassembly functions of RLC SDUs

[0064] - Re-segmentation function (Re-segmentation of RLC data PDUs)

[0065] - Reordering function (Reordering of RLC data PDUs)

[0066] - Duplicate detection

[0067] - Error detection function (Protocol error detection)

[0068] - RLC SDU discard function

[0069] RLC re-establishment function

[0070] In the above, the in-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer to an upper layer in sequence; it may include a function to reassemble and deliver them if a single RLC SDU is received divided into multiple RLC SDUs; it may include a function to rearrange received RLC PDUs based on an RLC SN (sequence number) or PDCP SN (sequence number); it may include a function to record lost RLC PDUs after rearranging the order; it may include a function to report the status of lost RLC PDUs to the transmitting side; it may include a function to request retransmission of lost RLC PDUs; if there are lost RLC SDUs, it may include a function to deliver only the RLC SDUs prior to the lost RLC SDU to the upper layer in sequence; or if a predetermined timer has expired even if there are lost RLC SDUs, it may include a function to deliver all RLC SDUs received before the timer started to the upper layer in sequence; or It may include a function that delivers all RLC SDUs received up to the present to the upper layer in order once a predetermined timer has expired, even if there are lost RLC SDUs. Additionally, the RLC PDUs mentioned above may be processed in the order they are received (regardless of the order of sequence numbers, but in the order of arrival) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, segments stored in a buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with the multiplexing function of the NR MAC layer.

[0071] In the above, the out-of-sequence delivery function of the NR RLC device refers to a function of delivering RLC SDUs received from a lower layer directly to an upper layer regardless of order. It may include a function of reassembling and delivering them when a single RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs and sorting the order to record the lost RLC PDUs.

[0072] The NR MAC (1b-15, 1b-30) can be connected to multiple NR RLC layer devices configured in a terminal, and the main functions of the NR MAC may include some of the following functions.

[0073] - Mapping function (Mapping between logical channels and transport channels)

[0074] - Multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0075] - Scheduling information reporting function

[0076] - HARQ function (Error correction through HARQ)

[0077] - Priority handling between logical channels of one UE

[0078] - Priority handling between UEs by means of dynamic scheduling

[0079] - MBMS service identification function

[0080] - Transport format selection function

[0081] - Padding

[0082] The NR PHY layer (1b-20, 1b-25) can perform the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them to the wireless channel, or demodulating OFDM symbols received through the wireless channel and channel decoding them to transmit them to the upper layer.

[0083] FIG. 3 is a diagram showing a terminal in an RRC idle mode (RRC_IDLE) or RRC disabled state (RRC_INACTIVE) in a next-generation mobile communication system according to an embodiment of the present invention performing a cell reselection evaluation procedure.

[0084] The cell reselection evaluation procedure may refer to a procedure for determining whether to maintain the current serving cell or reselect the cell to a neighbor cell when a terminal in RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) determines, due to a certain reason or movement, that the quality of service of the serving cell currently camp-on becomes lower than the quality of service of a neighbor cell.

[0085] In the case of handover, whether to perform a handover operation is determined by the network (AMF or source gNB), whereas in the case of cell reselection, a terminal in an RRC idle mode or RRC disabled state can determine whether to perform a cell reselection operation itself based on cell measurement values. The cell that the terminal reselects may refer to a cell using the same NR frequency (NR intra-frequency or serving NR frequency) as the serving cell currently camp-on, a cell using a different NR frequency (NR inter-frequency) from the serving cell, or a cell located at a frequency using a different Radio Access Technology (hereinafter RAT) (inter-RAT frequency).

[0086] Referring to FIG. 3, the terminal (1c-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR cell (1c-02) (1c-03).

[0087] The NR cell (1c-02) may send an RRC disconnection message (RRCRelease) to the terminal (1c-01) (1c-04) to disconnect the RRC connection with the terminal (1c-01) which is in RRC connection mode. If the message includes suspension configuration information (suspendConfig), the terminal (1c-01) may transition to RRC inactive mode (RRC_INACTIVE) (1c-05). If the message does not include suspendConfig, the terminal (1c-01) may transition to RRC idle mode (RRC_IDLE) (1c-05). The message may include cellReselectionPriorities for the terminal (1c-01) to perform cell reselection. cellReselectionPriorities may contain at least one value among freqPriorityListEUTRA, freqPriorityListNR, and t320. If the above terminal (1c-01) includes a t320 value, it can drive the T320 timer with that value. Specifically, the configuration information included in the RRCRelease message may be as shown in [Table 1] below.

[0088] [Table 1]

[0089]

[0090]

[0091]

[0092] In step 1c-13, a terminal (1c-01) in an RRC idle mode or RRC disabled state can obtain essential system information from an NR cell (1c-02). In this disclosure, Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as essential system information.

[0093] In step 1c-15, a terminal (1c-01) in an RRC idle mode or RRC inactive state can perform a cell selection procedure based on the essential system information obtained in step 1e-13. That is, the terminal (1c-01) can find an NR suitable cell belonging to a selected PLMN (public land mobile network) or SNPN (standalone non-public network) and camp-on to that cell. At this time, the cell that the terminal camps on may be referred to as a serving cell. In this disclosure, a cell may be defined as a suitable cell if the conditions described in [Table 2] below are satisfied based on the 3GPP standard document "38.304: User Equipment (UE) procedures in Idle mode and RRC Inactive state".

[0094] [Table 2]

[0095]

[0096] For reference, the above terminal (1c-01) can determine that the cell selection criteria are fulfilled if the following [Equation 1] is satisfied.

[0097] [Mathematical Formula 1]

[0098] Srxlev > 0 AND Squal > 0

[0099] where

[0100] Srxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset ) - P compensation - -Qoffset temp,

[0101] Squal = Q qualmeas - (Q qualmin + Q qualminoffset ) - Qoffset temp.Each parameter in the above [Mathematical Formula 1] is defined as follows.

[0102]

[0103] In step 1c-20, a terminal (1c-01) in an RRC idle mode or RRC disabled state may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5) containing cell reselection information from a serving cell (1c-02) to perform a cell reselection evaluation procedure. SIB2 may include information / parameters commonly applied to the reselection of NR intra-frequency, NR inter-frequency, and inter-RAT frequency cells by the terminal (1c-01) in an RRC idle mode or RRC disabled state, and NR intra-frequency cell reselection information excluding information related to NR intra-frequency surrounding cells. For example, SIB2 may include one cell reselection priority setting information for the serving NR frequency (the frequency to which the currently camp-on cell belongs). Here, the cell reselection priority setting information may refer to cellReselectionPriority and cellReselectionSubPriority. More specifically, cellReselectionPriority can store an integer value (e.g., an integer value from 0 to 7), and cellReselectionSubPriority can store a decimal value (e.g., a decimal value from 0.2, 0.4, 0.6, or 0.8). If both cellReselectionPriority and cellReselectionSubPriority are signaled through SIB2, the terminal can derive a cell reselection priority value by adding the values ​​of the two fields. For reference, a larger cell reselection priority value signifies a higher priority. Specifically, the cell reselection setting information broadcast on SIB2 may be as shown in [Table 3] below.

[0104] [Table 3]

[0105]

[0106]

[0107] SIB3 may include neighboring cell information / parameters for a terminal in RRC idle mode or RRC disabled state to re-select an NR intra-frequency cell. For example, SIB3 may be broadcast with an NR intra-frequency cell list (intraFreqNeighCellList), a list of cells for which NR intra-frequency cell re-selection is allowed (intraFreqAllowedCellList), and a list of cells for which NR intra-frequency cell re-selection is not allowed (intraFreqExcludedCellList). Specifically, SIB3 may include the information in [Table 4] below.

[0108] [Table 4]

[0109]

[0110] SIB4 may include information / parameters for a terminal in RRC idle mode or RRC disabled state to reselect an NR inter-frequency cell. For example, SIB4 may include and broadcast one or more NR inter-frequencies, and may include and broadcast one cell reselection priority setting information for each NR inter-frequency. The cell reselection priority setting information for each NR inter-frequency refers to the contents described above (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each NR inter-frequency), but the cell reselection priority setting information for each inter-frequency is characterized as being broadcast optionally. Specifically, SIB4 may include the information in [Table 5] below.

[0111] [Table 5]

[0112]

[0113]

[0114] SIB5 may include information / parameters for a terminal in RRC idle mode or RRC disabled state to reselect an inter-RAT frequency cell. For example, SIB5 may include one or more EUTRA frequencies, and may include one cell reselection priority setting information for each EUTRA frequency. The cell reselection priority setting information for each EUTRA frequency refers to the contents described above (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each EUTRA frequency), but the cell reselection priority setting information for each EUTRA frequency is characterized by being broadcast optionally. Specifically, the information in [Table 6] below may be broadcast in SIB5.

[0115] [Table 6]

[0116]

[0117] Referring again to FIG. 3, a terminal (1c-01) in an RRC idle mode or RRC disabled state according to one example of the present disclosure may perform a cell reselection evaluation process. The cell reselection evaluation process may mean a series of processes including handling reselection priorities, performing frequency measurements by applying measurement rules for cell re-selection, and reselecting a cell by evaluating cell reselection criteria.

[0118] In step 1c-25, a terminal (1c-01) in RRC idle mode or RRC disabled state can determine a re-selection priority based on the RRC release message received in step 1c-04 or system information received in step 1c-20.

[0119] If the RRC disconnection message received in step 1c-04 includes cellReselectionPriorities and there is no t320 timer value in cellReselectionPriorities, or if the t320 timer value is set and the T320 timer is running, the terminal (1c-01) can determine the reselection priority based on the RRC disconnection message. That is, if the cellReselectionPriorities included in the RRC disconnection message can be applied, the terminal (1c-01) can determine the reselection priority based on the RRC disconnection message. If the RRC disconnection message does not include cellReselectionPriorities or if cellReselectionPriorities is disabled, the terminal (1c-01) can determine the reselection priority based on the system information received in step 1c-20.

[0120] The terminal (1c-01) according to the present disclosure can determine whether the cell reselection priority for each NR inter-frequency or inter-RAT frequency has the same cell reselection priority as the NR frequency to which the serving cell belongs, has a higher cell reselection priority than the NR frequency to which the serving cell belongs, or has a lower cell reselection priority than the NR frequency to which the serving cell belongs, based on the cell reselection priority value mapped to the NR frequency to which the serving cell belongs. For example, in the system information obtained in step 1c-20, if the cell reselection priority value mapped to the NR frequency to which the serving cell currently camp-on belongs is 3, the cell reselection priority value of inter NR frequency 1 is 2, the cell reselection priority value of inter NR frequency 2 is 3, the cell reselection priority value of inter NR frequency 3 is 4, and the cell reselection priority value of EUTRA frequency 1 is 2, the terminal (1c-01) can determine that inter NR frequency 1 and EUTRA frequency 1 have a lower reselection priority, determine that the cell reselection priority of inter NR frequency 2 has an equal reselection priority, and determine that the cell reselection priority of inter NR frequency 3 has a higher reselection priority.

[0121] In step 1c-30, a terminal (1c-01) in an RRC idle mode or RRC disabled state may perform frequency measurement for cell reselection. At this time, the terminal may perform frequency measurement using the following measurement rule according to the cell reselection priority determined in step 1c-25 in order to minimize battery consumption.

[0122] - The above terminal (1c-01) may not perform NR intra-frequency measurement if the following condition 1 is satisfied. Otherwise (for example, if the following condition 1 is not satisfied), the above terminal (1c-01) performs NR intra-frequency measurement.

[0123] ■ Condition 1: The serving cell's receive level (Srxlev) is greater than the SIntraSearchP threshold and the serving cell's receive quality (Squal) is greater than the SIntraSearchQ threshold (Serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ).

[0124] - For NR inter-frequency or inter-RAT frequency that has a higher reselection priority than the NR frequency of the current serving cell, the terminal can perform measurements in accordance with the 3GPP TS 38.133 standard.

[0125] - For NR inter-frequency with a reselection priority lower than or equal to the NR frequency of the current serving cell and inter-RAT frequency with a reselection priority lower than the NR frequency of the current serving cell, the terminal may not perform a measurement if Condition 2 below is satisfied. Otherwise (for example, if Condition 2 below is not satisfied), the terminal measures cells in an NR inter-frequency with a reselection priority lower than or equal to the NR frequency, or measures cells in an inter-RAT frequency with a reselection priority lower than the NR frequency.

[0126] ■ Condition 2: The serving cell's receive level (Srxlev) is greater than the SnonIntraSearchP threshold and the serving cell's receive quality (Squal) is greater than the SnonIntraSearchQ threshold (Serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ).

[0127] For reference, the aforementioned threshold values ​​(SintraSearchP, SintraSearchQ, SnonIntraSearchP, SnonintraSearchQ) can be broadcast through the system information obtained in step 1c-20.

[0128] If the above terminal (1c-01) supports relaxed measurement and there is a relaxed measurement in SIB2, the above terminal (1c-01) can perform the necessary measurement according to the above description by relaxing according to the contents described in [Table 7] below.

[0129] [Table 7]

[0130]

[0131]

[0132]

[0133] For reference, the above terminal (1c-01) can measure the SS-RSRP (Synchronization Signal based Reference Signal Received Power) level and SS-RSRQ (Synchronization Signal based Reference Signal Received Quality) level for the serving cell at least once every M1*N1DRX cycle and evaluate the cell selection criteria (S criterion) of the above-described embodiment. The values ​​for M1 and N1 can be determined by the following [Table 8].

[0134] [Table 8]

[0135]

[0136] In step 1c-35, a terminal (1c-01) in an RRC idle mode or RRC disabled state can determine a cell that satisfies the cell reselection criteria as a reselection target cell based on the measurement value performed in step 1c-30. Different criteria may be applied to the cell reselection criteria depending on the cell reselection priority. If multiple cells satisfying the cell reselection criteria have different cell reselection priorities, reselecting a frequency / RAT cell with a higher priority takes precedence over reselecting a frequency / RAT cell with a lower priority (Cell reselection to a higher priority RAT / frequency shall take precedence over a lower priority RAT / frequency if multiple cells of different priorities fulfil the cell reselection criteria). Specifically, the operation of the terminal regarding the reselection criteria for inter-frequency / inter-RAT cells that have a higher priority than the frequency of the currently serving cell is as follows.

[0137] - 1st operation:

[0138] ■ If SIB2 broadcasts a threshold for threshServingLowQ and 1 second has passed since the terminal camped on to the current serving cell, the signal quality (Squal) of the inter-frequency / inter-RAT cell is Treselection at a specific time RAT Thresh during threshold X,HighQ If greater than (Squal > Thresh) X,HighQ during a time interval Treselection RAT), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0139] - Second operation:

[0140] ■ If the above terminal fails to perform the first operation, it performs the second operation.

[0141] ■ 1 second has passed since the above terminal camped on to the current serving cell and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is Treselection at a specific time RAT Thresh during threshold X,HighP If greater than (Srxlev > Thersh x,HighP during a time interval Treselection RAT -), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0142] Here, the terminal refers to the signal quality (Squal), reception level (Srxlev), and thresholds (Threh) of the inter-frequency cell. X,HighQ , Thresh X,HighP ), Treselection RAT The values ​​perform the first or second operation based on the information contained in the SIB4 broadcast from the serving cell, and the signal quality (Squal), reception level (Srxlev), and threshold (Threh) of the inter-RAT cell X,HighQ , Thresh X,HighP ), Treselection RAT The values ​​perform the first or second operation based on the information contained in SIB5 broadcast from the serving cell. For example, in SIB4, Q qualmin Value or Q rxlevminValues, etc. are included, and based on this, the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell is derived. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal can reselect the highest ranked cell from among the cells that satisfy the reselection criteria for intra-frequency / inter-frequency cells that have the same priority as the frequency of the currently serving cell described below.

[0143] In addition, the terminal's operation regarding the reselection criteria for intra-frequency / inter-frequency cells having the same priority as the current serving cell's frequency is as follows.

[0144] - Third operation:

[0145] ■ When the signal quality (Squal) and reception level (Srxlev) of an intra-frequency / inter-frequency cell are greater than 0, the cell-specific Rank is derived based on the measured value (RSRP) (The UE shall perform ranking of all cells that fulfills the cell selection criterion S). The Ranks of the serving cell and surrounding cells are calculated respectively through the following Equation 2.

[0146] [Mathematical Formula 2]

[0147] Rs = Q meas,s + Q hyst - Qoffset temp

[0148] Rn = Q meas,n - Qoffset - Qoffset temp

[0149] ● Here, Qmeas,s is the RSRP measurement of the serving cell, Qmeas,n is the RSRP measurement of the surrounding cell, Qhyst is the hysteresis value of the serving cell, and Qoffset is the offset between the serving cell and the surrounding cell. The Qhyst value is included in SIB2 and is used commonly for the reselection of intra-frequency / inter-frequency cells. In the case of reselection of an intra-frequency cell, Qoffset is signaled per cell and applied only to the specified cell, and is included in SIB3. In the case of reselection of an inter-frequency cell, Qoffset is signaled per cell and applied only to the specified cell, and is included in SIB4. If the Rank of the surrounding cell calculated from Equation 2 above is greater than the Rank of the serving cell (Rn > Rs), the optimal cell among the surrounding cells is reselected.

[0150] ● Here, Qoffset temp This is an offset temporarily applied to the cell and may refer to the connEstFailOffset included in ConnEstFailureControld broadcast from SIB1, and can be applied in the event of an RRC connection failure (e.g., when the T300 timer expires).

[0151] In addition, the terminal's operation regarding the reselection criteria for inter-frequency / inter-RAT cells with a lower priority than the frequency of the current serving cell is as follows.

[0152] - 4th Action:

[0153] ■ If SIB2 broadcasts a threshold for threshServingLowQ and 1 second has passed since the terminal camped on to the current serving cell, and the signal quality (Squal) of the current serving cell is less than the threshold ThreshServing, LowQ (Squal < ThreshServing, LowQ) and the signal quality (Squal) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX, LowQ during a specific time interval TreselectionRAT (Squal > ThreshX, LowQ during a time interval TreselectionRAT), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0154] - Fifth Action:

[0155] ■ If the above terminal fails to perform the 4th operation, it performs the 5th operation.

[0156] ■ 1 second has passed since the above terminal camped on to the current serving cell, the reception level (Srxlev) of the current serving cell is less than the threshold ThreshServing, LowP (Srxlev < ThreshServing, LowP), and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is Treselection at a specific time RAT Thresh during threshold X,LowQ - If greater than (Srxlev > Thresh) X,LowP during a time interval Treselection RAT ), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0157] Here, the fourth or fifth operation for the terminal's inter-frequency cell is the threshold values ​​(ThreshServing,LowQ, ThreshServing,LowP) included in SIB2 broadcast from the serving cell, and the signal quality (Squal), reception level (Srxlev), and threshold values ​​(Threh) of the inter-frequency cell included in SIB4 broadcast from the serving cell. X,LowQ , Thresh X,LowP ), Treselection RAT It is performed based on, and the fourth or fifth operation for the terminal's inter-RAT cell is performed using the threshold values ​​(ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcast from the serving cell and the signal quality (Squal), reception level (Srxlev), and threshold values ​​(Threh) of the inter-RAT cell included in SIB5 broadcast from the serving cell. X,LowQ , Thresh X,LowP ), Treselection RAT It is performed based on. For example, in SIB4, Q qualmin Value or Q rxlevmin Values, etc. are included, and based on this, the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell is derived. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal can reselect the highest ranked cell from among the cells that satisfy the reselection criteria for intra-frequency / inter-frequency cells that have the same priority as the frequency of the currently serving cell described below.

[0158] In step 1c-40, a terminal (1c-01) in an RRC idle mode or RRC disabled state receives system information (e.g., MIB or SIB1) broadcast from a candidate target cell before finally re-selecting a candidate target cell, and based on the received system information, determines whether the reception level (Srxlev) and reception quality (Squal) of the candidate target cell satisfy a cell selection criterion called the S-criterion (Equation 1) (Srxlev > 0 AND Squal > 0). If Equation 1 is satisfied and the candidate target cell is suitable, the terminal (1c-01) can re-select the candidate target cell.

[0159] FIG. 4 is a diagram illustrating a method in which a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure reports a band list supported by the low-power wake-up receiver to a base station.

[0160] A terminal (1d-01) according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR (1d-02) installed in the terminal (1d-01) refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) and an LR (1d-03) additionally installed in the terminal (1d-01) may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using LR is less than that of MR, the terminal (1d-01) can obtain a power saving effect by turning off MR (1d-02) and using LR (1d-03) according to a predetermined condition, or by having LR (1d-03) perform the measurements that MR (1d-02) would perform instead. For reference, the state in which the MR (1d-02) of the terminal (1d-01) is turned off can be referred to as an ultra-deep-sleep state.

[0161] The band list supported by the MR (1d-02) mounted on the terminal (1d-01) according to one embodiment of the present disclosure and the band list supported by the LR (1d-03) may be different or the same. Specifically, it may mean at least one of the following.

[0162] The band list supported by the MR (1d-02) of the terminal (1d-01) and the band list supported by the LR (1d-03) of the terminal (1d-01) may be the same.

[0163] Some of the band lists supported by the MR (1d-02) of the terminal (1d-01) can be supported by the LR (1d-03) of the terminal (1d-01).

[0164] One or more bands that are not supported by the MR (1d-02) of the terminal (1d-01) can be supported by the LR (1d-03) of the terminal (1d-01).

[0165] Referring to FIG. 4, the terminal (1d-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (1d-05) (1d-10).

[0166] In step 1d-15, the base station (1d-05) may transmit a terminal capability report request message (UECapabilityEnquiry) to the terminal (1d-01) to obtain terminal radio access capability information (UE radio access capability information) from the terminal.

[0167] In step 1d-20, the terminal (1d-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (1d-05). The message may include a list of NR bands supported by the MR (1d-02) of the terminal (1d-01) (supportedBandListNR).

[0168] The above supportedBandListNR consists of one or more BandNRs. Each BandNR includes a FreqBandIndicatorNR that designates an NR frequency band number, and additionally, additional terminal capability information (e.g., extended cyclic prefix) that the MR (1d-02) of the terminal (1d-01) supports in the corresponding NR frequency band may be included in the BandNR. Specific information included in the BandNR can be referenced in 3GPP technical specification 38.331. The FreqBandIndicatorNR may be represented as an integer value from 1 to 1024 (INTEGER (1..1024)), and 3GPP technical specifications 38.101-1, 38.101-2, and 38.101-5 may be referenced to determine which NR frequency band number a specific value designates.

[0169] According to one embodiment of the present disclosure, the terminal (1d-01) may inform the base station (1d-05) of one or more NR bands (i.e., an NR band list) supported by the terminal's LR (1d-03) through the message. Specifically, in one example of the present disclosure, it is proposed that the terminal (1d-01) include the NR band list supported by the terminal's LR (1d-03) in the message in at least one of the following ways.

[0170] Method 1: When a specific NR frequency band supported by the MR (1d-02) of a terminal is also supported by the LR (1d-03) of the terminal, an indicator (e.g., LP-WUSReception)) indicating that the NR frequency band is also supported by the LR (1d-03) of the terminal may be included within the BandNR supported by the MR (1d-02) of the terminal (1d-01). When notifying the base station (1d-05) that a specific NR frequency band is supported by both the MR (1d-02) and LR (1d-03) of the terminal (1d-01), Method 1 requires fewer bits compared to including the FreqBandIndicatorNR information redundantly, because the FreqBandIndicatorNR information is included in the BandNR only once and only the indicator is additionally introduced. Therefore, if some of the NR band lists supported by the terminal's MR (1d-02) are supported by the terminal's LR (1d-03), this method 1 can be very effective in terms of signaling. For example, if Abstract Syntax Notation One (ASN.1) for the above method 1 is used, it can be expressed as shown in the following [Table 9].

[0171] [Table 9]

[0172]

[0173] - Method 2: The NR band list supported by the LR (1d-03) of the terminal (1d-01) is configured as a parallel list having the same number of entries and the same order as the NR band list supported by the MR (1d-02) of the terminal, and each entry may include an indicator or information (e.g., LP-WUSReception) indicating whether the NR band supported by the MR (1d-02) of the terminal (1d-01) is also supported by the LR (1d-03) of the terminal (1d-01). For example, if the list of NR bands supported by MR (1d-02) consists of Band 1, Band 2, and Band 3, and the list of NR bands supported by LR (1d-03) consists of Band 2 and Band 3, the list of NR bands supported by LR (1d-03) consists of three entries, the first entry may contain information that Band 1 is not supported by LR (1d-03) (e.g., if there is no LP-WUSReception indicator), the second entry may contain information that Band 2 is supported by LR (1d-03) (e.g., if there is an LP-WUSReception indicator), and the third entry may contain information that Band 3 is supported by LR (1d-03) (e.g., if there is an LP-WUSReception indicator). Since Method 2 above requires bits indicating the size of the number of NR bands supported by the MR (1d-02) (for reference, Method 1 above does not require bits for size, but requires 3 bytes per BandNR, i.e., 24 bits), Method 2 above can be very effective signalingly when only a very small portion of the list of NR bands supported by the terminal's MR (1d-02) is supported by the terminal's LR (1d-03). For example, if Abstract Syntax Notation One (hereinafter ASN.1) for Method 2 above is used, it can be expressed as shown in the following [Table 10].

[0174] [Table 10]

[0175]

[0176] - Method 3: The NR band list supported by the LR (1d-03) of the terminal is configured independently of the NR band list supported by the MR (1d-02) of the terminal (1d-01), and each entry may include NR band information (BandNR-LR) supported by the LR (1d-03). According to Method 3, BandNR-LR includes FreqBandIndicatorNR, which designates an NR frequency band number, and additionally may include additional terminal capability information (e.g., extended cyclic prefix) supported by the LR (1d-03) of the terminal in the corresponding NR frequency band. Method 3 can be signaling effective because, when one or more specific NR bands are supported only in the LR, the NR band list supported by the LR (1d-03) is configured independently of the MR (1d-02), and only additional functions supported only in the LR need to be defined for each NR band. For example, if Abstract Syntax Notation One (hereinafter ASN.1) for the above method 3 is used, it can be expressed as shown in the following [Table 11].

[0177] [Table 11]

[0178]

[0179] - Method 4: The terminal capability information message may include an indicator indicating that the NR band list supported by the terminal’s MR (1d-02) and the NR band list supported by the terminal’s LR (1d-03) are identical. Method 4 may include an explicit indicator in the terminal capability information message, or, if the terminal capability information message includes other capability information associated with the terminal’s LR (1d-03) (e.g., whether LR is supported, an indicator indicating whether there is a capability to perform relaxed measurement on serving cells and / or surrounding cells depending on LR support, an indicator indicating whether there is a capability to replace the serving cell measurement derived from LR with the serving cell measurement of MR (i.e., offloading of serving cell measurement from MR to LR)) and there is no additional NR band list information, it may implicitly indicate that the NR band list supported by the terminal’s MR (1d-02) and the NR band list supported by the terminal’s LR (1d-03) are identical.

[0180] FIG. 5 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0181] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0182] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0183] In one embodiment of the present disclosure, it is assumed that signals / channels related to low-power wake-up and separate NR signals / channels are supported in the same frequency band. That is, it means that the MR frequency and the LR frequency are operated in the same frequency band.

[0184] Referring to FIG. 5, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1e-05).

[0185] In step 1e-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from a serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include information (LP-WUS supporting bit) indicating whether Low Power Wake-Up Signals / channels (LP-WUS) are supported for each MR frequency. According to one embodiment of the present disclosure, the terminal may map each MR frequency to one of the following types based on the presence or absence of an LP-WUS supporting bit broadcast for each MR frequency, cell reselection priority information (cellReselectionPriority and / or cellReselectionSubPriority), and whether the terminal's LR supports the MR frequency.

[0186] - Type 1 MR frequency: If the LR of a terminal supports an MR frequency that is indicated in the system information as supporting LP-WUS (i.e., an LP-WUS supporting bit exists), the terminal may regard the said MR frequency as a Type 1 MR frequency. The LR of the terminal may receive LP-WUS transmitted on an LR frequency operating in the same band as the Type 1 MR frequency.

[0187] - Type 2 MR frequency: If the LR of a terminal does not support an MR frequency that is indicated in the system information as supporting LP-WUS (i.e., LP-WUS supporting bit exists), the terminal may regard the said MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive LP-WUS transmitted on an LR frequency operating in the same band as the Type 2 MR frequency.

[0188] - Type 3 MR frequency: In the case of an MR frequency where the system information does not indicate support for LP-WUS (i.e., absence of an LP-WUS supporting bit), the terminal may regard the MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, LP-WUS may not be transmitted on an LR frequency operating in the same band as the frequency.

[0189] In step 1e-15, the terminal proposes to apply cell reselection priority setting information broadcast from system information according to the following rules.

[0190] - MR frequencies belonging to Type 1 can always have a higher reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal can determine the reselection priority of the Type 1 MR frequencies by applying cell reselection priority setting information (cellReselectionPriority and / or cellReselectionSubPriority mapped to each MR frequency belonging to Type 1) according to the aforementioned embodiment (Fig. 3).

[0191] The above terminal can determine the reselection priority of MR frequencies belonging to Type 2 and MR frequencies belonging to Type 3 by applying cell reselection priority setting information according to the above-described embodiment (Fig. 3).

[0192] For example, terminals that do not support LR and terminals that support LR can determine the cell reselection priority as shown in the following [Table 12].

[0193] [Table 12]

[0194]

[0195] FIG. 6 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0196] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0197] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0198] In one embodiment of the present disclosure, it is assumed that signals / channels related to low-power wake-up and separate NR signals / channels are supported in the same frequency band. That is, it means that the MR frequency and the LR frequency are operated in the same frequency band.

[0199] Referring to FIG. 6, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1f-05).

[0200] In step 1f-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from a serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include Low Power Wake-Up Signals / channels (LP-WUS) cell reselection priority information per MR frequency. The LP-WUS cell reselection priority information may refer to LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority, and each parameter value may follow the previously described embodiment (Fig. 3). For reference, at the MR frequency where the LP-WUS cell reselection priority information is broadcast, the LP-WUS may be transmitted on an LR frequency operating in the same band as that frequency. According to one embodiment of the present disclosure, the terminal can map each MR frequency to one of the following types based on LP-WUS cell reselection priority information by MR frequency, cell reselection priority information (cellReselectionPriority and / or cellReselectionSubPriority), and whether the terminal's LR supports the MR frequency.

[0201] - Type 1 MR frequency: If the LR of a terminal supports an MR frequency that includes LP-WUS cell reselection priority information in the system information, the terminal may regard the said MR frequency as a Type 1 MR frequency. The LR of the terminal may receive an LP-WUS transmitted on an LR frequency operating in the same band as the said MR frequency.

[0202] - Type 2 MR frequency: If the LR of the terminal does not support an MR frequency that includes LP-WUS cell reselection priority information in the system information, the terminal may regard the said MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive an LP-WUS transmitted on an LR frequency operating in the same band as the said MR frequency.

[0203] - Type 3 MR Frequency: In the case of an MR frequency that does not include LP-WUS cell reselection priority information in the system information, the terminal may regard the MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, LP-WUS may not be transmitted on an LR frequency operating in the same band as the frequency.

[0204] In step 1f-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information broadcast in system information and / or LP-WUS cell reselection priority setting information according to the following rules.

[0205] Type 2 MR frequencies and Type 3 MR frequencies can have their cell reselection priority determined by applying cell reselection priority information.

[0206] For MR frequencies belonging to Type 1, the reselection priority can be determined by applying at least one of the following options.

[0207] ■ Option 1: For Type 1 MR frequencies, the cell reselection priority can be determined by applying LP-WUS cell reselection priority information.

[0208] ■ Option 2: MR frequencies belonging to Type 1 may always have a higher cell reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal may determine the cell reselection priority of the Type 1 MR frequencies by applying LP-WUS cell reselection priority setting information (LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority mapped to each MR frequency belonging to Type 1).

[0209] ■ Option 3: For MR frequencies belonging to Type 1, the cell reselection priority can be determined by adding cell reselection priority information and LP-WUS cell reselection priority information (add cell reselection priority information + LP-WUS cell reselection priority information for type 1 MR frequencies).

[0210] For example, terminals that do not support LR and terminals that support LR can determine the cell selection priority as shown in the following [Table 13].

[0211] [Table 13]

[0212]

[0213] FIG. 7 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0214] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0215] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0216] In one embodiment of the present disclosure, it is assumed that signals / channels related to low-power wake-up and separate NR signals / channels are supported in different frequency bands. That is, the MR frequency and the LR frequency mean that they operate in different frequency bands.

[0217] Referring to FIG. 7, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1g-05).

[0218] In step 1g-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from the serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include LR frequency information that supports Low Power Wake-Up Signals / channels (LP-WUS) per MR frequency. For example, the LR frequency information may refer to the carrier frequency and / or initial bandwidth part and / or LP-WUS configuration information, etc., to which the LP-WUS is transmitted. According to one embodiment of the present disclosure, the terminal can map each MR frequency to one of the following types depending on whether LR frequency information for each MR frequency is included, cell reselection priority information (cellReselectionPriority and / or cellReselectionSubPriority), and whether the LR of the terminal supports an LR frequency associated with the MR frequency.

[0219] - Type 1 MR frequency: If the LR of a terminal supports an LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 1 MR frequency. The LR of the terminal may receive an LP-WUS transmitted at an LR frequency operating in a frequency band different from the MR frequency.

[0220] - Type 2 MR frequency: If the LR of the terminal does not support an LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive an LP-WUS transmitted on an LR frequency operating in a frequency band different from the MR frequency.

[0221] - Type 3 MR Frequency: In the case of an MR frequency for which LR frequency information is not associated in the system information, the terminal may regard the MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, there is no LR frequency operated in association with that frequency.

[0222] In step 1g-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information broadcast in system information according to the following rules.

[0223] - MR frequencies belonging to Type 1 can always have a higher reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal can determine the cell reselection priority of the Type 1 MR frequencies by applying cell reselection priority setting information (cellReselectionPriority and / or cellReselectionSubPriority mapped to each MR frequency belonging to Type 1) according to the aforementioned embodiment (Fig. 3).

[0224] The above terminal can determine the cell reselection priority of MR frequencies belonging to Type 2 and MR frequencies belonging to Type 3 by applying cell reselection priority setting information according to the above-described embodiment (Fig. 3).

[0225] For example, terminals that do not support LR and terminals that support LR can determine the cell reselection priority as shown in the following [Table 14].

[0226] [Table 14]

[0227]

[0228] FIG. 8 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0229] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0230] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0231] In one embodiment of the present disclosure, it is assumed that signals / channels related to low-power wake-up and separate NR signals / channels are supported in different frequency bands. That is, the MR frequency and the LR frequency mean that they operate in different frequency bands.

[0232] Referring to FIG. 8, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1h-05).

[0233] In step 1h-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from the serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include LR frequency information that supports Low Power Wake-Up Signals / channels (LP-WUS) per MR frequency. For example, the LR frequency information may refer to the carrier frequency and / or initial bandwidth part and / or LP-WUS configuration information through which the LP-WUS is transmitted. The system information may include LP-WUS cell reselection priority information per MR frequency. LP-WUS cell reselection priority information may refer to LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority, and each parameter value may follow the aforementioned embodiment (Fig. 3). According to one embodiment of the present disclosure, the terminal may map each MR frequency to one of the following types depending on whether LR frequency information for each MR frequency is included, cell reselection priority information (cellReselectionPriority and / or cellReselectionSubPriority), LP-WUS cell reselection priority information, and whether the terminal's LR supports an LR frequency associated with the MR frequency.

[0234] - Type 1 MR frequency: If the LR of the terminal supports an LR frequency associated with the MR frequency in the system information, the terminal may regard the MR frequency as a Type 1 MR frequency. The LR of the terminal may receive an LP-WUS transmitted at an LR frequency operating in a frequency band different from the MR frequency.

[0235] - Type 2 MR frequency: If the LR of the terminal does not support an LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive an LP-WUS transmitted on an LR frequency operating in a frequency band different from the MR frequency.

[0236] - Type 3 MR Frequency: In the case of an MR frequency for which LR frequency information is not associated in the system information, the terminal may regard the MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, there is no LR frequency operated in association with that frequency.

[0237] In step 1h-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information and / or LP-WUS cell reselection priority setting information broadcast through system information according to the following rules.

[0238] - Type 2 MR frequencies and Type 3 MR frequencies can have their cell reselection priority determined by applying cell reselection priority information.

[0239] - For MR frequencies belonging to Type 1, the cell reselection priority can be determined by applying at least one of the following options.

[0240] ■ Option 1: For Type 1 MR frequencies, the cell reselection priority can be determined by applying LP-WUS cell reselection priority information.

[0241] ■ Option 2: MR frequencies belonging to Type 1 may always have a higher reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal may determine the cell reselection priority of the Type 1 MR frequencies by applying LP-WUS cell reselection priority setting information (LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority mapped to each MR frequency belonging to Type 1).

[0242] ■ Option 3: For MR frequencies belonging to Type 1, the cell reselection priority can be determined by adding cell reselection priority information and LP-WUS cell reselection priority information (add cell reselection priority information + LP-WUS cell reselection priority information for type 1 MR frequencies).

[0243] For example, terminals that do not support LR and terminals that support LR can determine the cell selection priority as shown in the following [Table 15].

[0244] [Table 15]

[0245]

[0246] FIG. 9 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0247] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0248] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0249] In one embodiment of the present disclosure, signals / channels associated with low-power wake-up and separate NR signals / channels may be supported in the same frequency band or in different frequency bands.

[0250] Referring to FIG. 9, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1i-05).

[0251] In step 1i-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from the serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include LR frequency information that supports Low Power Wake-Up Signals / channels (LP-WUS) per MR frequency. For example, the LR frequency information may refer to the carrier frequency and / or initial bandwidth part and / or LP-WUS configuration information where the LP-WUS is transmitted. An MR frequency containing LR frequency information may refer to the transmission of the LP-WUS via the LR frequency in the same or different band as the corresponding frequency. According to one embodiment of the present disclosure, the terminal can map each MR frequency to one of the following types depending on whether LR frequency information for each MR frequency is included, cell reselection priority information (cellReselectionPriority and / or cellReselectionSubPriority), and whether the LR of the terminal supports an LR frequency associated with the MR frequency.

[0252] - Type 1 MR frequency: If the LR of the terminal supports an LR frequency associated with the MR frequency in the system information, the terminal may regard the MR frequency as a Type 1 MR frequency. The LR of the terminal may receive an LP-WUS transmitted at an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0253] - Type 2 MR Frequency: If the LR of the terminal does not support an LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive an LP-WUS transmitted on an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0254] - Type 3 MR Frequency: In the case of an MR frequency for which LR frequency information is not associated in the system information, the terminal may regard the MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, there is no LR frequency operated in association with that frequency.

[0255] In step 1i-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information broadcast in system information according to the following rules.

[0256] - MR frequencies belonging to Type 1 can always have a higher cell reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal can determine the cell reselection priority of the Type 1 MR frequencies by applying cell reselection priority setting information (cellReselectionPriority and / or cellReselectionSubPriority mapped to each MR frequency belonging to Type 1) according to the aforementioned embodiment (Fig. 3).

[0257] - The above terminal can determine the cell reselection priority of MR frequencies belonging to Type 2 and MR frequencies belonging to Type 3 by applying cell reselection priority setting information according to the above-described embodiment (Fig. 3).

[0258] For example, terminals that do not support LR and terminals that support LR can determine the cell reselection priority as shown in the following [Table 16].

[0259] [Table 16]

[0260]

[0261] FIG. 10 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0262] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0263] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0264] In one embodiment of the present disclosure, signals / channels associated with low-power wake-up and separate NR signals / channels may be supported in the same frequency band or in different frequency bands.

[0265] Referring to FIG. 10, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1j-05).

[0266] In step 1j-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from the serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include information (LP-WUS supporting bit) indicating whether Low Power Wake-Up Signals / channels (LP-WUS) are supported for each MR frequency. For an MR frequency containing the LP-WUS supporting bit, it may mean that the LP-WUS is transmitted via an LR frequency operating in the same band as that frequency. The system information may include LR frequency information for each MR frequency. For example, the LR frequency information may refer to the carrier frequency and / or initial bandwidth part and / or LP-WUS configuration information where the LP-WUS is transmitted. An MR frequency containing LR frequency information may mean that an LP-WUS is transmitted through an LR frequency operating in a band different from the corresponding frequency. According to one embodiment of the present disclosure, the terminal may map each MR frequency to one of the following types depending on whether an LP-WUS supporting bit is included for each MR frequency, whether LR frequency information is included, and whether the LR of the terminal supports an LR frequency associated with the MR frequency.

[0267] - Type 1 MR frequency: If the LR of the terminal supports an MR frequency that is indicated to support LP-WUS in the system information or supports the LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 1 MR frequency. The LR of the terminal may receive LP-WUS transmitted at an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0268] - Type 2 MR frequency: If the LR of a terminal does not support an MR frequency indicated in the system information as supporting LP-WUS (i.e., LP-WUS supporting bit exists), or if the LR frequency associated with the MR frequency is not supported in the system information, the terminal may regard the MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive LP-WUS transmitted on an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0269] - Type 3 MR Frequency: In the case of an MR frequency for which LR frequency information is not associated in the system information and which is not indicated in the system information as supporting LP-WUS, the terminal may regard the said MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, there is no LR frequency operated in association with that frequency.

[0270] In step 1j-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information broadcast in system information according to the following rules.

[0271] - MR frequencies belonging to Type 1 can always have a higher reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal can determine the cell reselection priority of the Type 1 MR frequencies by applying cell reselection priority setting information (cellReselectionPriority and / or cellReselectionSubPriority mapped to each MR frequency belonging to Type 1) according to the aforementioned embodiment (Fig. 3).

[0272] - The above terminal can determine the cell reselection priority of MR frequencies belonging to Type 2 and MR frequencies belonging to Type 3 by applying cell reselection priority setting information according to the above-described embodiment (Fig. 3).

[0273] For example, terminals that do not support LR and terminals that support LR can determine the cell selection priority as shown in the following [Table 17].

[0274] [Table 17]

[0275]

[0276] FIG. 11 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0277] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0278] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0279] In one embodiment of the present disclosure, signals / channels associated with low-power wake-up and separate NR signals / channels may be supported in the same frequency band or in different frequency bands.

[0280] Referring to FIG. 11, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1k-05).

[0281] In step 1k-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from the serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include LR frequency information for each MR frequency. For example, the LR frequency information may refer to the carrier frequency and / or initial bandwidth part and / or LP-WUS configuration information through which the LP-WUS is transmitted. An MR frequency containing LR frequency information may refer to the transmission of the LP-WUS through an LR frequency operating in a band different from that frequency. The system information may include LP-WUS cell reselection priority information for each MR frequency. LP-WUS cell reselection priority information may refer to LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority, and each parameter value may follow the aforementioned embodiment (Fig. 3). For reference, at an MR frequency where LP-WUS cell reselection priority information is broadcast without LR frequency information, LP-WUS may be transmitted at an LR frequency operating in the same band as that frequency. According to one embodiment of the present disclosure, the terminal may map each MR frequency to one of the following types depending on whether LR frequency information is included for each MR frequency, LP-WUS cell reselection priority information, and whether the terminal's LR supports an LR frequency associated with the MR frequency.

[0282] - Type 1 MR frequency: If the LR of the terminal supports an MR frequency including LP-WUS cell reselection priority information in the system information or supports the LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 1 MR frequency. The LR of the terminal may receive LP-WUS transmitted on an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0283] - Type 2 MR Frequency: If the LR of a terminal does not support an MR frequency containing LP-WUS cell reselection priority information in the system information, or if the LR frequency associated with the MR frequency is not supported in the system information, the terminal may regard the MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive LP-WUS transmitted on an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0284] - Type 3 MR Frequency: In the case of an MR frequency for which LR frequency information is not associated in the system information and LP-WUS cell reselection priority information is not included, the terminal may regard the said MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, there is no LR frequency operated in association with that frequency.

[0285] In step 1k-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information broadcast in system information and / or LP-WUS cell reselection priority setting information according to the following rules.

[0286] - Type 2 MR frequencies and Type 3 MR frequencies can have their reselection priority determined by applying cell reselection priority information.

[0287] - For MR frequencies belonging to Type 1, the priority for cell selection can be determined by applying at least one of the following options.

[0288] ■ Option 1: For Type 1 MR frequencies, the reselection priority can be determined by applying LP-WUS cell reselection priority information.

[0289] ■ Option 2: MR frequencies belonging to Type 1 may always have a higher cell reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal may determine the cell reselection priority of the Type 1 MR frequencies by applying LP-WUS cell reselection priority setting information (LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority mapped to each MR frequency belonging to Type 1).

[0290] ■ Option 3: For MR frequencies belonging to Type 1, the cell reselection priority can be determined by adding cell reselection priority information and LP-WUS cell reselection priority information (add cell reselection priority information + LP-WUS cell reselection priority information for type 1 MR frequencies).

[0291] For example, terminals that do not support LR and terminals that support LR can determine the cell selection priority as shown in the following [Table 18].

[0292] [Table 18]

[0293]

[0294] FIG. 12 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0295] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0296] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0297] In one embodiment of the present disclosure, signals / channels associated with low-power wake-up and separate NR signals / channels may be supported in the same frequency band or in different frequency bands.

[0298] Referring to FIG. 12, the terminal may be in RRC idle mode (RRC_IDLE) or RRC disabled mode (RRC_INACTIVE) (1l-05).

[0299] In step 1l-10, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from the serving cell to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (Fig. 3). Additionally, the system information may include LR frequency information for each MR frequency. For example, the LR frequency information may refer to the carrier frequency and / or initial bandwidth part and / or LP-WUS configuration information through which the LP-WUS is transmitted. An MR frequency containing LR frequency information may mean that the LP-WUS is transmitted via an LR frequency operating in a band different from that frequency. The system information may include information indicating whether LP-WUS is supported for each MR frequency (LP-WUS supporting bit). In the case of an MR frequency containing an LP-WUS supporting bit, it may mean that the LP-WUS is transmitted through an LR frequency operating in the same band as the corresponding frequency. The system information may include LP-WUS cell reselection priority information per MR frequency. The LP-WUS cell reselection priority information may refer to LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority, and each parameter value may follow the aforementioned embodiment (Fig. 3). According to one embodiment of the present disclosure, the terminal may map each MR frequency to one of the following types depending on whether an LP-WUS supporting bit is included per MR frequency, whether LR frequency information is included, LP-WUS cell reselection priority information, and whether the terminal's LR supports an LR frequency associated with the MR frequency.

[0300] - Type 1 MR frequency: If the LR of the terminal supports an MR frequency that is indicated to support LP-WUS in the system information or supports the LR frequency associated with an MR frequency in the system information, the terminal may regard the MR frequency as a Type 1 MR frequency. The LR of the terminal may receive LP-WUS transmitted at an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0301] - Type 2 MR frequency: If the LR of a terminal does not support an MR frequency indicated in the system information as supporting LP-WUS (i.e., LP-WUS supporting bit exists), or if the LR frequency associated with the MR frequency is not supported in the system information, the terminal may regard the MR frequency as a Type 2 MR frequency. The LR of the terminal cannot receive LP-WUS transmitted on an LR frequency operating in the same frequency band as the MR frequency or in a different frequency band.

[0302] - Type 3 MR Frequency: In the case of an MR frequency for which LR frequency information is not associated in the system information and which is not indicated as supporting LP-WUS in the system information, the terminal may regard the said MR frequency as a Type 3 MR frequency. For a Type 3 MR frequency, there is no LR frequency operating in association with that frequency.

[0303] In step 11-15, in one example of the present disclosure, it is proposed that the terminal apply cell reselection priority setting information broadcast in system information and / or LP-WUS cell reselection priority setting information according to the following rules.

[0304] - Type 2 MR frequencies and Type 3 MR frequencies can have their cell reselection priority determined by applying cell reselection priority information.

[0305] - For MR frequencies belonging to Type 1, the priority for cell selection can be determined by applying at least one of the following options.

[0306] ■ Option 1: For Type 1 MR frequencies, the cell reselection priority can be determined by applying LP-WUS cell reselection priority information.

[0307] ■ Option 2: MR frequencies belonging to Type 1 may always have a higher cell reselection priority than MR frequencies belonging to Type 2 and frequencies belonging to Type 3. If there are multiple MR frequencies belonging to Type 1, the terminal may determine the cell reselection priority of the Type 1 MR frequencies by applying LP-WUS cell reselection priority setting information (LP-WUS-cellReselectionPriority and / or LP-WUS-cellReselectionSubPriority mapped to each MR frequency belonging to Type 1).

[0308] ■ Option 3: For MR frequencies belonging to Type 1, the cell reselection priority can be determined by adding cell reselection priority information and LP-WUS cell reselection priority information (add cell reselection priority information + LP-WUS cell reselection priority information for type 1 MR frequencies).

[0309] For example, terminals that do not support LR and terminals that support LR can determine the cell reselection priority as shown in the following [Table 19].

[0310] [Table 19]

[0311]

[0312] FIG. 13 is a flowchart showing how a terminal supporting a low-power wake-up receiver in a next-generation mobile communication system according to an embodiment of the present disclosure determines cell reselection priority setting information.

[0313] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR.

[0314] Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used as a concept of a frequency in which NR signals / channels separate from low-power wake-up signals / channels are provided, and the term LR frequency is used as a concept of a frequency in which signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR, and can obtain a power saving effect by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.

[0315] In one embodiment of the present disclosure, signals / channels associated with low-power wake-up and separate NR signals / channels may be supported in the same frequency band or in different frequency bands.

[0316] Referring to FIG. 13, the terminal may be in RRC connection mode (1m-05).

[0317] In step 1m-10, the terminal may receive an RRC disconnection message (RRCRelease). The message may include at least one of the following information.

[0318] - An indicator (LP-WUS cell reselection control bit) indicating to determine a cell reselection priority by applying at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, 9, 10, 11, 12)

[0319] - t320 value or new timer value

[0320] ■ In cases where the above timer value is not included and only the LP-WUS cell reselection control bit is set, the terminal can determine the cell reselection priority by applying at least one of the above embodiments (Figs. 5, 6, 7, 8, 9, 10, 11, 12) unless the LP-WUS cell reselection control bit is released.

[0321] ■ When both the timer value and the LP-WUS cell reselection control bit are set, the terminal may determine the cell reselection priority by applying at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, 9, 10, 11, 12) only while the timer is running. Of course, when only the timer value is set (i.e., when the LP-WUS cell reselection control bit is not set), the terminal may determine the cell reselection priority by applying at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, 9, 10, 11, 12) only while the timer is running. That is, the timer value itself may perform the role of the LP-WUS cell reselection control bit.

[0322] ■ The above terminal receives the timer value and can drive the timer with the value. If the driven timer expires, the terminal can release the LP-WUS cell reselection control bit.

[0323] In step 1m-15, the terminal that applied the received RRC disconnection message may be in RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0324] In step 1m-20, the terminal may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or new SIB) containing cell reselection information from a serving cell to perform a cell reselection evaluation procedure. This may follow at least one of the aforementioned embodiments (Figs. 3, 5, 6, 7, 8, 9, 10, 11, 12).

[0325] In step 1m-25, the terminal may determine a cell reselection priority according to at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, 9, 10, 11, 12) if at least one of the following conditions is satisfied.

[0326] - Condition 1: The LP-WUS cell reselection control bit is set / maintained and

[0327] - Condition 2: If the LP-WUS cell reselection control bit is set / maintained and the timer started in step 1m-10 is still running

[0328] - Condition 3: If the timer started in step 1m-10 is still running

[0329] FIG. 14 is a flowchart of a cell capable of transmitting a low-power wake-up in a next-generation mobile communication system according to an embodiment of the present disclosure, transmitting an RRC disconnection message or broadcasting system information.

[0330] Referring to FIG. 14, a cell can transmit NR signals / channels separate from Low Power Wake Up Signals / Channels (hereinafter LP-WUS). The cell, or a certain cell operating in the same frequency band as the cell, or a certain cell operating in a different frequency band from the cell, can transmit LP-WUS. Hereinafter, for convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used to refer to a frequency where NR signals / channels separate from Low Power Wake Up Signals / Channels are provided, and the term LR frequency is used to refer to a frequency where signals / channels related to Low Power Wake Up are provided. The cell may refer to a cell operating at the MR frequency. Additionally, the cell may refer to a cell operating at the MR frequency and also operating at the LR frequency.

[0331] In step 1n-05, the cell may transmit an RRC disconnection message (RRCRelease) to a terminal that supports an LR (Low Power Wake-Up Receiver, hereinafter LR). The message may include at least one of the following.

[0332] - An indicator (LP-WUS cell reselection control bit) indicating to determine a cell reselection priority by applying at least one of the above-described embodiments (Figs. 5, 6, 7, 8, 9, 10, 11, 12)

[0333] - t320 value or new timer value

[0334] In step 1n-10, the cell may broadcast system information. The system information may include at least one of the following and be broadcast.

[0335] - Information indicating whether Low Power Wake-Up Signals / channels (LP-WUS) are supported by MR frequency (LP-WUS supporting bit)

[0336] - Cell Reselection Priority Information by MR Frequency

[0337] - LP-WUS Cell Reselection Priority Information by MR Frequency

[0338] - LR Frequency Information by MR Frequency

[0339] FIG. 15 is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0340] Referring to FIG. 15, a terminal according to one example of the present disclosure includes an RF (Radio Frequency) processing unit (10-10), a baseband processing unit (10-20), a storage unit (10-30), and a control unit (10-40).

[0341] The RF processing unit (10-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (10-10) up-converts the baseband signal provided by the baseband processing unit (10-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (10-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Although only one antenna is shown in the drawing, the terminal may be equipped with multiple antennas. In addition, the RF processing unit (10-10) may include multiple RF chains. Furthermore, the RF processing unit (10-10) may perform beamforming. For the above beamforming, the RF processing unit (10-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processing unit can perform MIMO and can receive multiple layers when performing MIMO operation.

[0342] The baseband processing unit (10-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (10-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (10-10). For example, in the case of following the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through inverse fast Fourier transform (IFFT) operations and cyclic prefix (CP) insertion. Additionally, upon receiving data, the baseband processing unit (10-20) divides the baseband signal provided by the RF processing unit (10-10) into OFDM symbol units, restores the signals mapped to subcarriers through a fast Fourier transform (FFT), and then restores the received bit sequence through demodulation and decoding.

[0343] The baseband processing unit (10-20) and the RF processing unit (10-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (10-20) and the RF processing unit (10-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit (10-20) and the RF processing unit (10-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit (10-20) and the RF processing unit (10-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), cellular network (e.g., LTE), etc. In addition, the above different frequency bands may include super high frequency (SHF) bands (e.g., 2 NRHz, NRHz) and millimeter wave (e.g., 60 GHz) bands.

[0344] The storage unit (1o-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (1o-30) can store information related to a second connection node that performs wireless communication using a second wireless connection technology. Additionally, the storage unit (1o-30) provides the stored data upon request from the control unit (1o-40).

[0345] The control unit (10-40) controls the overall operations of the terminal. For example, the control unit (10-40) transmits and receives signals through the baseband processing unit (10-20) and the RF processing unit (10-10). Additionally, the control unit (10-40) writes and reads data to and from the storage unit (10-30). To this end, the control unit (10-40) may include at least one processor. For example, the control unit (10-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications.

[0346] FIG. 16 is a block diagram showing the configuration of an NR base station according to one embodiment of the present disclosure.

[0347] Referring to FIG. 16, a base station according to one example of the present disclosure is configured to include an RF processing unit (1p-10), a baseband processing unit (1p-20), a backhaul communication unit (1p-30), a storage unit (1p-40), and a control unit (1p-50).

[0348] The RF processing unit (1p-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1p-10) up-converts the baseband signal provided by the baseband processing unit (1p-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1p-10) may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in the drawing, the first connection node may be equipped with multiple antennas. Additionally, the RF processing unit (1p-10) may include multiple RF chains. Furthermore, the RF processing unit (1p-10) may perform beamforming. For the above beamforming, the RF processing unit (1p-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit can perform down-to-down MIMO operation by transmitting one or more layers.

[0349] The baseband processing unit (1p-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (1p-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (1p-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (1p-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (1p-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT operation and CP insertion. Additionally, upon receiving data, the baseband processing unit (1p-20) divides the baseband signal provided by the RF processing unit (1p-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operations, and then restores the received bit sequence through demodulation and decoding. The baseband processing unit (1p-20) and the RF processing unit (1p-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1p-20) and the RF processing unit (1p-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, a communication unit, or a wireless communication unit.

[0350] The backhaul communication unit (1p-30) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (1p-30) converts a bit sequence transmitted from the main base station to another node, e.g., an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from the other node into a bit sequence.

[0351] The storage unit (1p-40) stores data such as basic programs, application programs, and configuration information for the operation of the main base station. In particular, the storage unit (1p-40) can store information regarding bearers assigned to connected terminals, measurement results reported from connected terminals, etc. Additionally, the storage unit (1p-40) can store information serving as a criterion for determining whether to provide or disconnect multiple connections to the terminal. Furthermore, the storage unit (1p-40) provides the stored data upon the request of the control unit (1p-50).

[0352] The control unit (1p-50) controls the overall operations of the main station. For example, the control unit (1p-50) transmits and receives signals through the baseband processing unit (1p-20) and the RF processing unit (1p-10) or through the backhaul communication unit (1p-30). Additionally, the control unit (1p-50) writes and reads data to and from the storage unit (1p-40). To this end, the control unit (1p-50) may include at least one processor.

[0353] Methods according to the embodiments described in the claims or specification of the present invention may be implemented in the form of hardware, software, or a combination of hardware and software.

[0354] 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.

[0355] 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.

[0356] 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.

[0357] In the specific embodiments of the present invention 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 in the singular form, or even if a component is expressed in the singular form, it may be composed in the plural form.

[0358] Meanwhile, although specific embodiments have been described in the detailed description of the present invention, 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. In a method of a terminal in a wireless communication system, A step of receiving a radio resource control (RRC) release message from a base station; A step of receiving system information including cell reselection information for first frequencies from the base station; Based on the cell reselection information above, a step of checking whether information related to the LP-WUS (low power - wake up signal) provided at the second frequency is set for each of the first frequencies; and Based on the above verification, the step of determining the cell reselection priority for the first frequencies is included, and A method of a terminal characterized in that the second frequency is set in the same frequency band as the first frequencies.

2. In Paragraph 1, The information related to the above LP-WUS includes bit information indicating that a corresponding first frequency supports the LP-WUS, and A method of a terminal characterized by comprising: a step of determining the cell reselection priority, wherein among the first frequencies, a first type frequency in which the bit information is set in the cell reselection related information and is supported by the low-power receiver of the terminal, a second type frequency in which the bit information is set in the cell reselection related information and is not supported by the low-power receiver of the terminal, and a third type frequency in which the bit information is not set in the cell reselection related information; and a step of determining that the first type frequency has a higher cell reselection priority than the second type frequency and the third type frequency.

3. In Paragraph 1, The information related to the above LP-WUS includes LP-WUS cell reselection priority information related to the above LP-WUS, and The step of determining the cell reselection priority comprises: a step of identifying, among the first frequencies, a first type frequency in which the LP-WUS cell reselection priority information is set in the cell reselection related information and is supported by the low-power receiver of the terminal, a second type frequency in which the LP-WUS cell reselection priority information is set in the cell reselection related information and is not supported by the low-power receiver of the terminal, and a third type frequency in which the LP-WUS cell reselection priority information is not set in the cell reselection related information; and a step of determining that the first type frequency has a higher cell reselection priority than the second type frequency and the third type frequency. A method of a terminal characterized in that, when there are multiple first type frequencies, the frequency with the highest priority indicated by the corresponding LP-WUS cell reselection priority information among the first type frequencies is selected for cell reselection.

4. In Paragraph 1, A method of a terminal characterized in that the above RRC release message includes control information instructing the performance of a specific operation to determine the cell re-selection priority based on the above confirmation, and timer information regarding the time for performing the specific operation.

5. In the method of a base station in a wireless communication system, A step of transmitting a radio resource control (RRC) release message to a terminal; and The method includes the step of transmitting system information, including cell reselection information for first frequencies, to the above terminal. The cell reselection information above includes information related to an LP-WUS (low power - wake up signal) provided at a second frequency for at least one of the first frequencies, and A method of a base station characterized in that the second frequency is set in the same frequency band as the first frequencies.

6. In Paragraph 5, The information related to the above LP-WUS includes bit information indicating that a corresponding first frequency supports the LP-WUS, and A method of a base station characterized in that, among the first frequencies, the first type frequency in which the bit information is set in the cell reselection related information and supported by the low-power receiver of the terminal has a higher cell reselection priority than the second type frequency in which the bit information is set in the cell reselection related information and not supported by the low-power receiver of the terminal among the first frequencies, and the third type frequency in which the bit information is not set in the cell reselection related information among the first frequencies.

7. In Paragraph 5, The information related to the above LP-WUS includes LP-WUS cell reselection priority information related to the above LP-WUS, and A method of a base station characterized in that, among the first frequencies, the LP-WUS cell reselection priority information is set in the cell reselection related information and the first type frequency supported by the low-power receiver of the terminal has a higher cell reselection priority than the second type frequency among the first frequencies where the LP-WUS cell reselection priority information is set in the cell reselection related information and the low-power receiver of the terminal does not support, and the third type frequency among the first frequencies where the LP-WUS cell reselection priority information is not set in the cell reselection related information.

8. In Paragraph 5, A method of a base station characterized in that the above RRC release message includes control information instructing the performance of a specific operation to determine a cell reselection priority based on whether information related to the LP-WUS is set for each of the first frequencies in the cell reselection related information, and timer information regarding the time for performing the specific operation.

9. In a terminal of a wireless communication system, Transmitter / receiver; and The control unit controls the transceiver to receive a radio resource control (RRC) release message from a base station, controls the transceiver to receive system information including cell reselection information for first frequencies from the base station, checks whether information related to a low power-wake-up signal (LP-WUS) provided at a second frequency is set for each of the first frequencies based on the cell reselection information, and includes a control unit that determines a cell reselection priority for the first frequencies based on the check. A terminal characterized in that the second frequency is set in the same frequency band as the first frequencies.

10. In Paragraph 9, The information related to the above LP-WUS includes bit information indicating that a corresponding first frequency supports the LP-WUS, and The control unit, wherein the step of determining the cell reselection priority comprises identifying, among the first frequencies, a first type frequency in which the bit information is set in the cell reselection related information and is supported by the low-power receiver of the terminal, a second type frequency in which the bit information is set in the cell reselection related information and is not supported by the low-power receiver of the terminal, and a third type frequency in which the bit information is not set in the cell reselection related information; and determining that the first type frequency has a higher cell reselection priority than the second type frequency and the third type frequency.

11. In Paragraph 9, The information related to the above LP-WUS includes LP-WUS cell reselection priority information related to the above LP-WUS, and The control unit identifies, among the first frequencies, a first type frequency supported by the low-power receiver of the terminal where the LP-WUS cell reselection priority information is set in the cell reselection related information, a second type frequency not supported by the low-power receiver of the terminal where the LP-WUS cell reselection priority information is set in the cell reselection related information, and a third type frequency where the LP-WUS cell reselection priority information is not set in the cell reselection related information; determines that the first type frequency has a higher cell reselection priority than the second type frequency and the third type frequency; and, if there are multiple first type frequencies, selects the frequency indicated by the highest priority according to the corresponding LP-WUS cell reselection priority information among the first type frequencies for cell reselection.

12. In Paragraph 9, A terminal characterized in that the above RRC release message includes control information instructing the performance of a specific operation to determine the cell reselection priority based on the above confirmation, and timer information regarding the time for performing the specific operation.

13. In a base station of a wireless communication system, Transmitter / receiver; and The apparatus includes a control unit that controls the transceiver to transmit a radio resource control (RRC) release message to a terminal, and controls the transceiver to transmit system information including cell reselection information for first frequencies to the terminal. The cell reselection information above includes information related to an LP-WUS (low power - wake up signal) provided at a second frequency for at least one of the first frequencies, and A base station characterized in that the second frequency is set in the same frequency band as the first frequencies.

14. In Paragraph 13, The information related to the above LP-WUS includes bit information indicating that a corresponding first frequency supports the LP-WUS, and A base station characterized in that, among the first frequencies, the first type frequency, in which the bit information is set in the cell reselection information and supported by the low-power receiver of the terminal, has a higher cell reselection priority than the second type frequency, in which the bit information is set in the cell reselection information and not supported by the low-power receiver of the terminal, and the third type frequency, in which the bit information is not set in the cell reselection information among the first frequencies.

15. In Paragraph 13, The information related to the above LP-WUS includes LP-WUS cell reselection priority information related to the above LP-WUS, and A base station characterized in that, among the first frequencies, the first type frequency supported by the low-power receiver of the terminal, where the LP-WUS cell reselection priority information is set in the cell reselection related information, has a higher cell reselection priority than the second type frequency not supported by the low-power receiver of the terminal, where the LP-WUS cell reselection priority information is set in the cell reselection related information among the first frequencies, and the third type frequency where the LP-WUS cell reselection priority information is not set in the cell reselection related information among the first frequencies.

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