Method and device for performing measurement on basis of low-power wake-up receiver in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Provided is a method performed by a terminal supporting a first reception module and a second reception module of a wireless communication system. The method comprises the steps of: receiving system information including configuration information related to a low-power wake-up signal through the first reception module; measuring the low-power wake-up signal through the second reception module on the basis of information related to the low-power wake-up signal; identifying whether a first condition is satisfied, according to a measurement result of the low-power wake-up signal; and on the basis of whether the first condition is satisfied, determining whether to stop serving cell measurement through the first reception module or whether to perform relaxed serving cell measurement through the first reception module.

Description

Method and device for performing measurements based on a low-power wake-up receiver in a wireless communication system

[0001] The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to a method and apparatus for performing measurements based on a low-power wake-up receiver in a wireless communication system.

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

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

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

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

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

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

[0008] With the advancement of wireless communication systems, the utilization of various terminal types, such as XR devices and wearable devices, is becoming more visible, and power efficiency is emerging as a key performance indicator for wireless communication networks. Consequently, the need for more advanced terminal power management technology is growing.

[0009] According to one embodiment of the present disclosure, a method performed by a terminal supporting a first receiving module and a second receiving module of a wireless communication system is provided. The method comprises the steps of: receiving, through the first receiving module, system information including low-power wake-up signal-related configuration information; measuring, through the second receiving module, a low-power wake-up signal based on the low-power wake-up signal-related information; identifying, based on a measurement result of the low-power wake-up signal, whether a first condition is satisfied; and determining, based on whether the first condition is satisfied, whether to stop serving cell measurement through the first receiving module or whether to perform relaxed serving cell measurement through the first receiving module.

[0010] According to one embodiment of the present disclosure, a terminal supporting a first receiving module and a second receiving module of a wireless communication system is provided. The terminal includes a transceiver and a control unit. The control unit is configured to receive, through the first receiving module, system information including setting information related to a low-power wake-up signal, through the transceiver, and measure a low-power wake-up signal through the second receiving module based on the low-power wake-up signal-related information, and determine whether a first condition is satisfied based on a measurement result of the low-power wake-up signal, and determine whether to stop serving cell measurement through the first receiving module or perform relaxed serving cell measurement through the first receiving module based on whether the first condition is satisfied.

[0011] According to one embodiment of the present disclosure, a terminal can perform frequency measurement and cell reselection procedures more efficiently and power consumption of the terminal can be improved.

[0012] FIG. 1 is a diagram illustrating the structure of an LTE system according to one embodiment of the present invention.

[0013] FIG. 2 is a diagram illustrating a wireless protocol structure in an LTE system according to an embodiment of the present invention.

[0014] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present invention.

[0015] FIG. 4 is a diagram showing a wireless protocol structure of a next-generation mobile communication system according to an embodiment of the present invention.

[0016] FIG. 5 is a diagram illustrating a cell reselection evaluation procedure performed by a terminal in an RRC idle mode (RRC_IDLE) or an RRC inactive state (RRC_INACTIVE) in a next-generation mobile communication system according to an embodiment of the present invention.

[0017] FIG. 6 is a diagram illustrating a terminal supporting a low-power wake-up receiver performing frequency measurement for performing cell reselection in a next-generation mobile communication system according to an embodiment of the present invention.

[0018] FIG. 7 is a diagram illustrating a terminal supporting a low-power wake-up receiver performing frequency measurement for cell reselection in a next-generation mobile communication system according to an embodiment of the present invention.

[0019] FIG. 8 is a diagram illustrating a terminal supporting a low-power wake-up receiver performing frequency measurement for performing cell reselection in a next-generation mobile communication system according to an embodiment of the present invention.

[0020] Figure 9 is a block diagram showing the internal structure of a terminal according to one embodiment of the present invention.

[0021] Figure 10 is a block diagram showing the configuration of an NR base station according to one embodiment of the present invention.

[0022] The operating principles of the present invention will be described in detail below with reference to the attached drawings. In the following description of the present invention, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0023] In the following description of the present invention, detailed descriptions of known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

[0024] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, and terms referring to various identification information are provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0025] For convenience of explanation, the present invention uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP) LTE standard. However, the present invention is not limited to these terms and names and can be equally applied to systems conforming to other standards. In the present invention, the term "eNB" may be used interchangeably with "gNB" for convenience of explanation. In other words, a base station described as an eNB may also represent a gNB.

[0026] FIG. 1 is a diagram illustrating the structure of an LTE system according to one embodiment of the present invention.

[0027] Referring to FIG. 1, as illustrated, a wireless access network of an LTE system may be composed of next-generation base stations (Evolved Node Bs, hereinafter referred to as ENBs, Node Bs or base stations) (1-05, 1-10, 1-15, 1-20), an MME (1-25, Mobility Management Entity) and an S-GW (1-30, Serving-Gateway). A user equipment (UE or terminal) (1-35) may access an external network through the ENBs (1-05 to 1-20) and the S-GW (1-30).

[0028] In Fig. 1, ENBs (1-05 to 1-20) may correspond to existing Node Bs of a UMTS system. ENBs are connected to UEs (1-35) via a wireless channel and may perform a more complex role than existing Node Bs. In an LTE system, all user traffic, including real-time services such as VoIP (Voice over IP) via the Internet Protocol, is serviced through a shared channel. Therefore, a device that collects status information such as buffer status, available transmission power status, and channel status of UEs and performs scheduling is required, and ENBs (1-05 to 1-20) may be responsible for this. One ENB can typically control multiple cells. For example, in order to achieve a transmission rate of 100 Mbps, an LTE system may use, for example, orthogonal frequency division multiplexing (OFDM) as a wireless access technology in a 20 MHz bandwidth. In addition, an adaptive modulation and coding (AMC) method can be applied, which determines the modulation scheme and channel coding rate according to the channel condition of the terminal. The S-GW (1-30) is a device that provides data bearers and can create or remove data bearers according to the control of the MME (1-25). The MME is a device that is responsible for various control functions as well as mobility management functions for the terminal and can be connected to multiple base stations.

[0029] FIG. 2 is a diagram illustrating a wireless protocol structure in an LTE system according to an embodiment of the present invention.

[0030] Referring to Figure 2, the wireless protocol of the LTE system may be composed of PDCP (Packet Data Convergence Protocol 2-05, 2-40), RLC (Radio Link Control 2-10, 2-35), and MAC (Medium Access Control 2-15, 2-30) in the terminal and ENB, respectively. PDCP (Packet Data Convergence Protocol) (2-05, 2-40) may be responsible for operations such as IP header compression / decompression. The main functions of PDCP can be summarized as follows.

[0031] - Header compression and decompression (ROHC only)

[0032] - User data transfer function

[0033] - In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

[0034] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0035] - Duplicate detection function (Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

[0036] - Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

[0037] - Encryption and decryption functions (Ciphering and deciphering)

[0038] - Timer-based SDU discard in uplink.

[0039] Radio Link Control (RLC) (2-10, 2-35) can perform ARQ operations, etc. by reconfiguring PDCP PDUs (Packet Data Units) to an appropriate size. The main functions of RLC can be summarized as follows.

[0040] - Data transfer function (Transfer of upper layer PDUs)

[0041] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0042] - Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

[0043] - Re-segmentation of RLC data PDUs (only for AM data transfer)

[0044] - Reordering of RLC data PDUs (only for UM and AM data transfer)

[0045] - Duplicate detection (only for UM and AM data transfer)

[0046] - Error detection function (Protocol error detection (only for AM data transfer))

[0047] - RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

[0048] - RLC re-establishment function

[0049] MAC (2-15, 2-30) connects to multiple RLC layer devices configured in a single terminal and can perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC can be summarized as follows.

[0050] - Mapping function (Mapping between logical channels and transport channels)

[0051] - Multiplexing and demultiplexing function (Multiplexing / demultiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels)

[0052] - Scheduling information reporting function

[0053] - HARQ function (Error correction through HARQ)

[0054] - Priority handling between logical channels of one UE

[0055] - Priority handling between UEs by means of dynamic scheduling

[0056] - MBMS service identification function

[0057] - Transport format selection function

[0058] - Padding function

[0059] The physical layer (2-20, 2-25) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

[0060] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present invention.

[0061] Referring to FIG. 3, as illustrated, a wireless access network of a next-generation mobile communication system (hereinafter referred to as NR or 2g) may be composed of a next-generation base station (New Radio Node B, hereinafter referred to as NR gNB or NR base station) (3-10) and an NR CN (3-05, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter referred to as NR UE or terminal) (3-15) may access an external network through the NR gNB (3-10) and the NR CN (3-05).

[0062] In Fig. 3, the NR gNB (3-10) can correspond to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (3-15) via a wireless channel and can provide a service that is superior to the existing Node B. In the next-generation mobile communication system, all user traffic is serviced through a shared channel, so a device that collects status information such as the buffer status of UEs, available transmission power status, and channel status and performs scheduling is required, and the NR NB (3-10) can be in charge of this. One NR gNB can typically control multiple cells. In order to implement ultra-high-speed data transmission compared to the current LTE, it can have a bandwidth exceeding the existing maximum, and beamforming technology can be additionally grafted using the orthogonal frequency division multiplexing (OFDM) method as a wireless access technology. In addition, an adaptive modulation and coding (AMC) method that determines a modulation scheme and channel coding rate according to the channel condition of the terminal can be applied. NR CN (3-05) can perform functions such as mobility support, bearer setup, and QoS setup. NR CN is a device that is responsible for various control functions as well as mobility management functions for the terminal and can be connected to multiple base stations. In addition, the next-generation mobile communication system can be interoperable with the existing LTE system, and NR CN can be connected to MME (3-25) through a network interface. MME can be connected to an existing base station, eNB (3-30).

[0063] FIG. 4 is a diagram showing a wireless protocol structure of a next-generation mobile communication system according to an embodiment of the present invention.

[0064] Referring to FIG. 4, the wireless protocol of the next-generation mobile communication system may be composed of NR SDAP (4-01, 4-45), NR PDCP (4-05, 4-40), NR RLC (4-10, 4-35), and NR MAC (4-15, 4-30) in the terminal and NR base station, respectively.

[0065] Key features of NR SDAP (4-01, 4-45) may include some of the following:

[0066] - Transfer of user plane data

[0067] - Mapping function between QoS flow and data bearer for both DL and UL

[0068] - QoS flow ID marking function for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0069] - Ability to map relective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0070] For the above SDAP layer device, the terminal can be configured by RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can be instructed to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink with the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0071] The main functions of NR PDCP (4-05, 4-40) may include some of the following functions:

[0072] - Header compression and decompression (ROHC only)

[0073] - User data transfer function

[0074] - In-sequence delivery of upper layer PDUs

[0075] - Out-of-sequence delivery of upper layer PDUs

[0076] - PDCP PDU reordering for reception

[0077] - Duplicate detection of lower layer SDUs

[0078] - Retransmission function (Retransmission of PDCP SDUs)

[0079] - Encryption and decryption functions (Ciphering and deciphering)

[0080] - Timer-based SDU discard in uplink.

[0081] The reordering function of the NR PDCP device above 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 may include a function of transmitting data directly without considering the order, may include a function of recording lost PDCP PDUs by reordering the order, 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.

[0082] The main functions of NR RLC(4-10, 4-35) may include some of the following functions:

[0083] - Data transfer function (Transfer of upper layer PDUs)

[0084] - In-sequence delivery of upper layer PDUs

[0085] - Out-of-sequence delivery of upper layer PDUs

[0086] - ARQ function (Error Correction through ARQ)

[0087] - Concatenation, segmentation and reassembly of RLC SDUs

[0088] - Re-segmentation of RLC data PDUs

[0089] - Reordering of RLC data PDUs

[0090] - Duplicate detection function

[0091] - Protocol error detection

[0092] - RLC SDU discard function

[0093] - RLC re-establishment function

[0094] The in-sequence delivery function of the NR RLC device above refers to the function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and may include a function of reassembling and transmitting RLC SDUs when an RLC SDU is originally received divided into multiple RLC SDUs, may include a function of reordering received RLC PDUs based on RLC SN (sequence number) or PDCP SN (sequence number), may include a function of recording lost RLC PDUs by reordering the sequence, may include a function of reporting the status of lost RLC PDUs to the transmitting side, may include a function of requesting retransmission of lost RLC PDUs, may include a function of sequentially transmitting only RLC SDUs up to the lost RLC SDU to an upper layer when there is a lost RLC SDU, or may include a function of sequentially transmitting all RLC SDUs received before the timer starts when a predetermined timer expires even when there is a lost RLC SDU. Or, even if there are lost RLC SDUs, if a predetermined timer has expired, it may include a function to sequentially deliver all RLC SDUs received up to the upper layer. In addition, the RLC PDUs may be processed in the order they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of sequence (out-of-sequence delivery). In the case of segments, the segments stored in the 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 a multiplexing function of the NR MAC layer.

[0095] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when an original RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of received RLC PDUs and arranging the order to record lost RLC PDUs.

[0096] NR MAC (4-15, 4-30) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0097] - Mapping function (Mapping between logical channels and transport channels)

[0098] - Multiplexing / demultiplexing of MAC SDUs

[0099] - Scheduling information reporting function

[0100] - HARQ function (Error correction through HARQ)

[0101] - Priority handling between logical channels of one UE

[0102] - Priority handling between UEs by means of dynamic scheduling

[0103] - MBMS service identification function

[0104] - Transport format selection function

[0105] - Padding function

[0106] The NR PHY layer (4-20, 4-25) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

[0107] FIG. 5 is a diagram illustrating a cell reselection evaluation procedure performed by a terminal in an RRC idle mode (RRC_IDLE) or an RRC inactive state (RRC_INACTIVE) in a next-generation mobile communication system according to an embodiment of the present invention.

[0108] The cell reselection evaluation procedure may refer to a procedure for determining whether to maintain the current serving cell or reselect a cell to a neighbor cell when the service quality of the serving cell on which the terminal is currently camped becomes lower than the service quality of the neighbor cell due to a predetermined reason or movement, while in the RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE).

[0109] In the case of handover, whether or not to perform a handover is determined by the network (AMF or source gNB), whereas in the case of cell reselection, a terminal in RRC idle mode or RRC inactive state can determine whether or not to perform a cell reselection on its own based on cell measurement values. The cell to be reselected by the terminal may refer to a cell using the same NR frequency (NR intra-frequency or serving NR frequency) as the serving cell on which it is currently camping, a cell using a different NR frequency (NR inter-frequency) from the serving cell, or a cell on a frequency (inter-RAT frequency) using a different radio access technology (RAT).

[0110] Referring to FIG. 5, in step 5-03, the terminal (5-01) may be in RRC connected mode (RRC_CONNECTED) by establishing an RRC connection with an NR cell (5-02).

[0111] In step 5-04, the NR cell (5-02) may transmit an RRC connection release message (RRCRelease) to release the RRC connection with the terminal (5-01) in the RRC connected mode. If the message includes suspension configuration information (suspendConfig), the terminal may transition to the RRC inactive mode (RRC_INACTIVE) in step 5-05. If the message does not include suspendConfig, the terminal may transition to the RRC idle mode (RRC_IDLE) in step 5-05. The message may include cellReselectionPriorities for the terminal to perform cell reselection. cellReselectionPriorities may store at least one value among freqPriorityListEUTRA, freqPriorityListNR, and t320. If the t320 value is included, the terminal may drive the T320 timer with the corresponding value. Specifically, the setting information included in the RRCRelease message may be as shown in Table 1 below.

[0112] RRCRelease ::= SEQUENCE {rrc-TransactionIdentifier RRC-TransactionIdentifier,criticalExtensions CHOICE {rrcRelease RRCRelease-IEs,criticalExtensionsFuture SEQUENCE {}}}RRCRelease-IEs ::= SEQUENCE {redirectedCarrierInfo RedirectedCarrierInfo OPTIONAL, -- Need NcellReselectionPriorities CellReselectionPriorities OPTIONAL, -- Need RsuspendConfig SuspendConfig OPTIONAL, -- Need RdeprioritisationReq SEQUENCE {deprioritisationType ENUMERATED {frequency, nr},deprioritisationTimer ENUMERATED {min5, min10, min15, min30}} OPTIONAL, -- Need NlateNonCriticalExtension OCTET STRING OPTIONAL,nonCriticalExtension RRCRelease-v1540-IEs OPTIONAL}RRCRelease-v1540-IEs ::= SEQUENCE {waitTime RejectWaitTime OPTIONAL, -- Need NnonCriticalExtension RRCRelease-v1610-IEs OPTIONAL}RedirectedCarrierInfo ::= CHOICE {nr CarrierInfoNR,eutra RedirectedCarrierInfo-EUTRA,...}RedirectedCarrierInfo-EUTRA ::= SEQUENCE {eutraFrequency ARFCN-ValueEUTRA,cnType ENUMERATED {epc,fiveGC} OPTIONAL -- Need N}CarrierInfoNR ::= SEQUENCE {carrierFreq ARFCN-ValueNR,ssbSubcarrierSpacing SubcarrierSpacing,smtc SSB-MTC OPTIONAL, -- Need S...}SuspendConfig ::= SEQUENCE {fullI-RNTI I-RNTI-Value,shortI-RNTI ShortI-RNTI-Value,ran-PagingCycle PagingCycle,ran-NotificationAreaInfo RAN-NotificationAreaInfo OPTIONAL, -- Need Mt380 PeriodicRNAU-TimerValue OPTIONAL, -- Need RnextHopChainingCount NextHopChainingCount,...,[[sl-ServingCellInfo-r17 SL-ServingCellInfo-r17 OPTIONAL, -- Cond L2RemoteUEsdt-Config-r17 SetupRelease { SDT-Config-r17} OPTIONAL, -- Need Msrs-PosRRC-InactiveConfig-r17 SRS-PosRRC-InactiveConfig-r17 OPTIONAL, -- Need Mran-ExtendedPagingCycle-r17 ExtendedPagingCycle-r17 OPTIONAL -- Need R]]}PeriodicRNAU-TimerValue ::= ENUMERATED { min5, min10, min20, min30, min60, min120, min360, min720}CellReselectionPriorities ::= SEQUENCE {freqPriorityListEUTRA FreqPriorityListEUTRA OPTIONAL, -- Need MfreqPriorityListNR FreqPriorityListNR OPTIONAL, -- Need Mt320 ENUMERATED {min5, min10, min20, min30, min60, min120, min180, spare1} OPTIONAL, -- Need R...,[[freqPriorityListNRSlicing-r17 FreqPriorityListNRSlicing-r17 OPTIONAL -- Need M]]}PagingCycle ::= ENUMERATED {rf32, rf64, rf128, rf256}ExtendedPagingCycle-r17 ::= ENUMERATED {rf256, rf512, rf1024, spare1}FreqPriorityListEUTRA ::= SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityEUTRAFreqPriorityListNR ::= SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityNRFreqPriorityEUTRA ::= SEQUENCE {carrierFreq ARFCN-ValueEUTRA,cellReselectionPriority CellReselectionPriority,cellReselectionSubPriority CellReselectionSubPriority OPTIONAL -- Need R}FreqPriorityNR ::= SEQUENCE {carrierFreq ARFCN-ValueNR,cellReselectionPriority CellReselectionPriority,cellReselectionSubPriority CellReselectionSubPriority OPTIONAL -- Need R}RAN-NotificationAreaInfo ::= CHOICE {cellList PLMN-RAN-AreaCellList,ran-AreaConfigList PLMN-RAN-AreaConfigList,...}PLMN-RAN-AreaCellList ::= SEQUENCE (SIZE (1.. maxPLMNIdentities)) OF PLMN-RAN-AreaCellPLMN-RAN-AreaCell ::= SEQUENCE {plmn-Identity PLMN-Identity OPTIONAL, -- Need Sran-AreaCells SEQUENCE (SIZE (1..32)) OF CellIdentity}PLMN-RAN-AreaConfigList ::= SEQUENCE (SIZE (1..maxPLMNIdentities)) OF PLMN-RAN-AreaConfigPLMN-RAN-AreaConfig ::= SEQUENCE {plmn-Identity PLMN-Identity OPTIONAL, -- Need Sran-Area SEQUENCE (SIZE (1..16)) OF RAN-AreaConfig}RAN-AreaConfig ::= SEQUENCE {trackingAreaCode TrackingAreaCode,ran-AreaCodeList SEQUENCE (SIZE (1..32)) OF RAN-AreaCode OPTIONAL -- Need R}.

[0113] In step 5-13, a terminal (5-01) in RRC idle mode or RRC inactive state can obtain system information or essential system information from an NR cell (5-02). In the present disclosure, the Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as essential system information.

[0114] In step 5-15, a terminal (5-01) in RRC idle mode or RRC deactivation can perform a cell selection procedure based on the system information or essential system information acquired in step 5-13. That is, the terminal can find an NR suitable cell belonging to the selected PLMN or SNPN and camp on that cell. The cell on which the terminal camps can be referred to as a serving cell. In the present disclosure, a cell can be defined as a suitable cell if the conditions in Table 2 below are satisfied.

[0115] suitable cell:For UE not operating in SNPN Access Mode, a cell is considered as suitable if the following conditions are fulfilled:-The cell is part of either the selected PLMN or the registered PLMN or PLMN of the Equivalent PLMN list, and for that PLMN either:-The PLMN-ID of that PLMN is broadcast by the cell with no associated CAG-IDs and CAG-only indication in the UE for that PLMN (TS 23.501) is absent or false;-Allowed CAG list in the UE for that PLMN (TS 23.501) includes a CAG-ID broadcast by the cell for that PLMN;-The cell selection criteria are fulfilled.According to the latest information provided by NAS:-The cell is not barred;-The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming" (TS 22.011), which belongs to a PLMN that fulfils the first bullet above.For UE operating in SNPN Access Mode, a cell is considered as suitable if the following conditions are fulfilled:-The cell is part of either the selected SNPN or the registered SNPN of the UE;-The cell selection criteria are fulfilled;According to the latest information provided by NAS:-The cell is not barred;-The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming" which belongs to either the selected SNPN or the registered SNPN of the UE.

[0116] 참고로, 상기 단말은 하기 수학식 1이 만족하면 셀 선택 기준(cell selection criteria)이 충족(fulfil)한다고 판단할 수 있다.

[0117] [수학식 1]

[0118] Srxlev > 0 AND Squal > 0

[0119] where

[0120] Srxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset ) - P compensation - -Qoffset temp,

[0121] Squal = Q qualmeas - (Q qualmin + Q qualminoffset ) - Qoffset temp.

[0122] 상기 수학식 1에서, 각 변수에 대한 설명은 아래 표 3에서 기술된다.

[0123] SrxlevCell selection RX level value (dB)SqualCell selection quality value (dB)Qoffset temp Offset temporarily applied to a cell as specified in TS 38.331 (dB)Q rxlevmeas Measured cell RX level value (RSRP)Q qualmeas Measured cell quality value (RSRQ)Q rxlevmin Minimum required RX level in the cell (dBm). If the UE supports SUL frequency for this cell, Q rxlevmin is obtained from q-RxLevMinSUL, if present, in SIB1, SIB2 and SIB4, additionally, if QrxlevminoffsetcellSULis present in SIB3 and SIB4 for the concerned cell, this cell specific offset is added to the corresponding Qrxlevmin to achieve the required minimum RX level in the concerned cell;else Q rxlevmin is obtained from q-RxLevMin in SIB1, SIB2 and SIB4, additionally, if Q rxlevminoffsetcellis present in SIB3 and SIB4 for the concerned cell, this cell specific offset is added to the corresponding Qrxlevmin to achieve the required minimum RX level in the concerned cell.Q qualmin Minimum required quality level in the cell (dB). Additionally, if Q qualminoffsetcell is signalled for the concerned cell, this cell specific offset is added to achieve the required minimum quality level in the concerned cell.Q rxlevminoffset Offset to the signalled Q rxlevmin taken into account in the Srxlev evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN, as specified in TS 23.122.Q qualminoffset Offset to the signalled Q qualmin taken into account in the Squal evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN, as specified in TS 23.122.P compensation For FR1, if the UE supports the additionalPmax in the NR-NS-PmaxList, if present, in SIB1, SIB2 and SIB4:max(P EMAX1 -P PowerClass, 0) - (min(P EMAX2 , P PowerClass ) - min(P EMAX1 , P PowerClass )) (dB);else:max(P EMAX1 -P PowerClass , 0) (dB)For FR2, P compensation is set to 0.For IAB-MT, P compensation is set to 0.P EMAX1 , P EMAX2 Maximum TX power level of a UE may use when transmitting on the uplink in the cell (dBm) defined as P EMAX in TS 38.101. If UE supports SUL frequency for this cell, P EMAX1 and P EMAX2 are obtained from the p-Max for SUL in SIB1 and NR-NS-PmaxList for SUL respectively in SIB1, SIB2 and SIB4 as specified in TS 38.331, else P EMAX1 and P EMAX2 are obtained from the p-Max and NR-NS-PmaxList respectively in SIB1, SIB2 and SIB4 for normal UL as specified in TS 38.331.P PowerClass Maximum RF output power of the UE (dBm) according to the UE power class as defined in TS 38.101-1.

[0124] In step 5-20, a terminal (5-01) in RRC idle mode or RRC deactivation state can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5) containing cell reselection information from a serving cell (5-02) to perform a cell reselection evaluation procedure. SIB2 may include information / parameters commonly applied to the RRC terminal when reselecting NR intra-frequency, NR inter-frequency, and inter-RAT frequency cells, and NR intra-frequency cell reselection information excluding information related to NR intra-frequency neighboring cells. For example, SIB2 may include one cell reselection priority setting information for a serving NR frequency (the frequency to which the currently camped-on cell belongs). The cell reselection priority setting information may mean cellReselectionPriority and cellReselectionSubPriority. Specifically, cellReselectionPriority can accept an integer value (for example, an integer value from 0 to 7), and cellReselectionSubPriority can accept a decimal value (for example, a decimal value from 0.2, 0.4, 0.6, 0.8). If both cellReselectionPriority and cellReselectionSubPriority are signaled, the UE can derive a cell reselection priority value by adding the two values. Note that a larger cell reselection priority value may indicate a higher priority. Specifically, the cell reselection configuration information broadcasted in SIB2 can be as shown in Table 4 below.

[0125] SIB2 ::= SEQUENCE {cellReselectionInfoCommon SEQUENCE {nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need SabsThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need SrangeToBestCell RangeToBestCell OPTIONAL, -- Need Rq-Hyst ENUMERATED {dB0, dB1, dB2, dB3, dB4, dB5, dB6, dB8, dB10,dB12, dB14, dB16, dB18, dB20, dB22, dB24},speedStateReselectionPars SEQUENCE {mobilityStateParameters MobilityStateParameters,q-HystSF SEQUENCE {sf-Medium ENUMERATED {dB-6, dB-4, dB-2, dB0},sf-High ENUMERATED {dB-6, dB-4, dB-2, dB0}}} OPTIONAL, -- Need R...},cellReselectionServingFreqInfo SEQUENCE {s-NonIntraSearchP ReselectionThreshold OPTIONAL, -- Need Ss-NonIntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need SthreshServingLowP ReselectionThreshold,threshServingLowQ ReselectionThresholdQ OPTIONAL, -- Need RcellReselectionPriority CellReselectionPriority,cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need R...},intraFreqCellReselectionInfo SEQUENCE {q-RxLevMin Q-RxLevMin,q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need Rq-QualMin Q-QualMin OPTIONAL, -- Need Ss-IntraSearchP ReselectionThreshold,s-IntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need St-ReselectionNR T-Reselection,frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Need SfrequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need Rp-Max P-Max OPTIONAL, -- Need Ssmtc SSB-MTC OPTIONAL, -- Need Sss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, -- Need Rssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need SderiveSSB-IndexFromCell BOOLEAN,...,[[t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL -- Need N]],[[smtc2-LP-r16 SSB-MTC2-LP-r16 OPTIONAL, -- Need Rssb-PositionQCL-Common-r16 SSB-PositionQCL-Relation-r16 OPTIONAL -- Cond SharedSpectrum]]},...,[[relaxedMeasurement-r16 SEQUENCE {lowMobilityEvaluation-r16 SEQUENCE {s-SearchDeltaP-r16 ENUMERATED {dB3, dB6, dB9, dB12, dB15,spare3, spare2, spare1},t-SearchDeltaP-r16 ENUMERATED {s5, s10, s20, s30, s60, s120, s180,s240, s300, spare7, spare6, spare5,spare4, spare3, spare2, spare1}} OPTIONAL, -- Need RcellEdgeEvaluation-r16 SEQUENCE {s-SearchThresholdP-r16 ReselectionThreshold,s-SearchThresholdQ-r16 ReselectionThresholdQ OPTIONAL -- Need R} OPTIONAL, -- Need RcombineRelaxedMeasCondition-r16 ENUMERATED {true} OPTIONAL, -- Need RhighPriorityMeasRelax-r16 ENUMERATED {true} OPTIONAL -- Need R} OPTIONAL -- Need R]]}RangeToBestCell ::= Q-OffsetRange.

[0126] SIB3 may include neighboring cell information / parameters for a UE in RRC idle mode or RRC inactive state to reselect an NR intra-frequency cell. For example, SIB3 may broadcast an NR intra-frequency cell list (intraFreqNeighCellList) for reselecting an NR intra-frequency cell, a cell list for which NR intra-frequency cell reselection is allowed (intraFreqAllowedCellList), and a cell list for which NR intra-frequency cell reselection is not allowed (intraFreqExcludedCellList). Specifically, SIB3 may broadcast the information in Table 5 below.

[0127] SIB3 ::= SEQUENCE {intraFreqNeighCellList IntraFreqNeighCellList OPTIONAL, -- Need RintraFreqExcludedCellList IntraFreqExcludedCellList OPTIONAL, -- Need RlateNonCriticalExtension OCTET STRING OPTIONAL,...,[[intraFreqNeighCellList-v1610 IntraFreqNeighCellList-v1610 OPTIONAL, -- Need RintraFreqAllowedCellList-r16 IntraFreqAllowedCellList-r16 OPTIONAL, -- Cond SharedSpectrum2intraFreqCAG-CellList-r16 SEQUENCE (SIZE (1..maxPLMN)) OF IntraFreqCAG-CellListPerPLMN-r16 OPTIONAL -- Need R]]}IntraFreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellIntra)) OF IntraFreqNeighCellInfoIntraFreqNeighCellList-v1610::= SEQUENCE (SIZE (1..maxCellIntra)) OF IntraFreqNeighCellInfo-v1610IntraFreqNeighCellInfo ::= SEQUENCE {physCellId PhysCellId,q-OffsetCell Q-OffsetRange,q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need Rq-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, -- Need Rq-QualMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R...}IntraFreqNeighCellInfo-v1610 ::= SEQUENCE {ssb-PositionQCL-r16 SSB-PositionQCL-Relation-r16 OPTIONAL -- Cond SharedSpectrum2}IntraFreqExcludedCellList ::= SEQUENCE (SIZE (1..maxCellExcluded)) OF PCI-RangeIntraFreqAllowedCellList-r16 ::= SEQUENCE (SIZE (1..maxCellAllowed)) OF PCI-RangeIntraFreqCAG-CellListPerPLMN-r16 ::= SEQUENCE {plmn-IdentityIndex-r16 INTEGER (1..maxPLMN),cag-CellList-r16 SEQUENCE (SIZE (1..maxCAG-Cell-r16)) OF PCI-Range}.

[0128] SIB4 may include information / parameters for a UE in RRC idle mode or RRC inactive state to reselect an NR inter-frequency cell. For example, SIB4 may broadcast one or more NR inter-frequencies, and may 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 above-described contents (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each NR inter-frequency), but one cell reselection priority setting information for each inter-frequency may optionally be broadcast. Specifically, information in Table 6 below may be broadcast in SIB4.

[0129] SIB4 ::= SEQUENCE {interFreqCarrierFreqList InterFreqCarrierFreqList,lateNonCriticalExtension OCTET STRING OPTIONAL,...,[[interFreqCarrierFreqList-v1610 InterFreqCarrierFreqList-v1610 OPTIONAL -- Need R]]}InterFreqCarrierFreqList ::= SEQUENCE (SIZE (1..maxFreq)) OF InterFreqCarrierFreqInfoInterFreqCarrierFreqList-v1610 ::= SEQUENCE (SIZE (1..maxFreq)) OF InterFreqCarrierFreqInfo-v1610InterFreqCarrierFreqInfo ::= SEQUENCE {dl-CarrierFreq ARFCN-ValueNR,frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Cond MandatoryfrequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need RnrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need SabsThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need Ssmtc SSB-MTC OPTIONAL, -- Need SssbSubcarrierSpacing SubcarrierSpacing,ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need SderiveSSB-IndexFromCell BOOLEAN,ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, -- Need Rq-RxLevMin Q-RxLevMin,q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need Rq-QualMin Q-QualMin OPTIONAL, -- Need Sp-Max P-Max OPTIONAL, -- Need St-ReselectionNR T-Reselection,t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL, -- Need SthreshX-HighP ReselectionThreshold,threshX-LowP ReselectionThreshold,threshX-Q SEQUENCE {threshX-HighQ ReselectionThresholdQ,threshX-LowQ ReselectionThresholdQ} OPTIONAL, -- Cond RSRQcellReselectionPriority CellReselectionPriority OPTIONAL, -- Need RcellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need Rq-OffsetFreq Q-OffsetRange DEFAULT dB0,interFreqNeighCellList InterFreqNeighCellList OPTIONAL, -- Need RinterFreqExcludedCellList InterFreqExcludedCellList OPTIONAL, -- Need R...}InterFreqCarrierFreqInfo-v1610 ::= SEQUENCE {interFreqNeighCellList-v1610 InterFreqNeighCellList-v1610 OPTIONAL, -- Need Rsmtc2-LP-r16 SSB-MTC2-LP-r16 OPTIONAL, -- Need RinterFreqAllowedCellList-r16 InterFreqAllowedCellList-r16 OPTIONAL,-- Cond SharedSpectrum2ssb-PositionQCL-Common-r16 SSB-PositionQCL-Relation-r16 OPTIONAL, -- Cond SharedSpectruminterFreqCAG-CellList-r16 SEQUENCE (SIZE (1..maxPLMN)) OF InterFreqCAG-CellListPerPLMN-r16 OPTIONAL -- Need R}InterFreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellInter)) OF InterFreqNeighCellInfoInterFreqNeighCellList-v1610 ::= SEQUENCE (SIZE (1..maxCellInter)) OF InterFreqNeighCellInfo-v1610InterFreqNeighCellInfo ::= SEQUENCE {physCellId PhysCellId,q-OffsetCell Q-OffsetRange,q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need Rq-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, -- Need Rq-QualMinOffsetCell INTEGER (1..8) OPTIONAL,-- Need R...}InterFreqNeighCellInfo-v1610 ::= SEQUENCE {ssb-PositionQCL-r16 SSB-PositionQCL-Relation-r16 OPTIONAL -- Cond SharedSpectrum2}InterFreqExcludedCellList ::= SEQUENCE (SIZE (1..maxCellExcluded)) OF PCI-RangeInterFreqAllowedCellList-r16 ::= SEQUENCE (SIZE (1..maxCellAllowed)) OF PCI-RangeInterFreqCAG-CellListPerPLMN-r16 ::= SEQUENCE {plmn-IdentityIndex-r16 INTEGER (1..maxPLMN),cag-CellList-r16 SEQUENCE (SIZE (1..maxCAG-Cell-r16)) OF PCI-Range},

[0130] SIB5 may include information / parameters for a UE in RRC idle mode or RRC inactive state to reselect an inter-RAT frequency cell. For example, SIB5 may broadcast one or more EUTRA frequencies, and may broadcast one cell reselection priority setting information for each EUTRA frequency. The cell reselection priority setting information for each EUTRA frequency refers to the above-described contents (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each EUTRA frequency), but one cell reselection priority setting information for each EUTRA frequency may optionally be broadcast. Specifically, the information in Table 7 below may be broadcast in SIB5.

[0131] SIB5 ::= SEQUENCE {carrierFreqListEUTRA CarrierFreqListEUTRA OPTIONAL, -- Need Rt-ReselectionEUTRA T-Reselection,t-ReselectionEUTRA-SF SpeedStateScaleFactors OPTIONAL, -- Need SlateNonCriticalExtension OCTET STRING OPTIONAL,...,[[carrierFreqListEUTRA-v1610 CarrierFreqListEUTRA-v1610 OPTIONAL -- Need R]]}CarrierFreqListEUTRA ::= SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRACarrierFreqListEUTRA-v1610 ::= SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA-v1610CarrierFreqEUTRA ::= SEQUENCE {carrierFreq ARFCN-ValueEUTRA,eutra-multiBandInfoList EUTRA-MultiBandInfoList OPTIONAL, -- Need Reutra-FreqNeighCellList EUTRA-FreqNeighCellList OPTIONAL, -- Need Reutra-ExcludedCellList EUTRA-FreqExcludedCellList OPTIONAL, -- Need RallowedMeasBandwidth EUTRA-AllowedMeasBandwidth,presenceAntennaPort1 EUTRA-PresenceAntennaPort1,cellReselectionPriority CellReselectionPriority OPTIONAL, -- Need RcellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need RthreshX-High ReselectionThreshold,threshX-Low ReselectionThreshold,q-RxLevMin INTEGER (-70..-22),q-QualMin INTEGER (-34..-3),p-MaxEUTRA INTEGER (-30..33),threshX-Q SEQUENCE {threshX-HighQ ReselectionThresholdQ,threshX-LowQ ReselectionThresholdQ} OPTIONAL -- Cond RSRQ}CarrierFreqEUTRA-v1610 ::= SEQUENCE {highSpeedEUTRACarrier-r16 ENUMERATED {true} OPTIONAL -- Need R}EUTRA-FreqExcludedCellList ::= SEQUENCE (SIZE (1..maxEUTRA-CellExcluded)) OF EUTRA-PhysCellIdRangeEUTRA-FreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellEUTRA)) OF EUTRA-FreqNeighCellInfoEUTRA-FreqNeighCellInfo ::= SEQUENCE {physCellId EUTRA-PhysCellId,dummy EUTRA-Q-OffsetRange,q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need Rq-QualMinOffsetCell INTEGER (1..8) OPTIONAL -- Need R}.

[0132] A terminal in RRC idle mode or RRC deactivation can perform a cell reselection evaluation process. The cell reselection evaluation process may refer to a series of processes that determine reselection priorities (reselection priorities handling), perform frequency measurements by applying measurement rules for cell reselection, and evaluate cell reselection criteria to reselect a cell.

[0133] In step 5-25, a terminal in RRC idle mode or RRC disabled state can determine a reselection priority based on the RRC release message received in step 5-04 or the system information received in step 5-20. If the RRC connection release message received in step 5-04 includes cellReselectionPriorities and cellReselectionPriorities does not contain a t320 timer value or the t320 timer value is set and the T320 timer is running, the terminal can determine a reselection priority based on the RRC connection release message.

[0134] For example, if cellReselectionPriorities included in the RRC connection release message can be applied, the terminal can determine the reselection priority according to the RRC connection release message. If cellReselectionPriorities is not included in the RRC connection release message or cellReselectionPriorities is disabled, the terminal can determine the reselection priority based on the system information received in steps 5-20.

[0135] The terminal according to the present disclosure can determine, based on the cell reselection priority value mapped to the NR frequency to which the serving cell currently camped-on belongs, 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 cell reselection priority higher than the NR frequency to which the serving cell belongs, or has a cell reselection priority lower than the NR frequency to which the serving cell belongs.

[0136] For example, if the cell reselection priority value mapped to the NR frequency to which the serving cell currently camped on belongs in the system information acquired in step 5-20 is set to 3, the cell reselection priority value of inter NR frequency 1 is set to 2, the cell reselection priority value of inter NR frequency 2 is set to 3, the cell reselection priority value of inter NR frequency 3 is set to 4, and the cell reselection priority value of EUTRA frequency 1 is set to 2, the terminal may determine inter NR frequency 1 and EUTRA frequency 1 to have lower reselection priorities, determine the cell reselection priorities of inter NR frequency 2 to be equal (equal reselection priority), and determine the cell reselection priority of inter NR frequency 3 to have higher reselection priorities.

[0137] In steps 5-30, a terminal in RRC idle mode or RRC disabled state may perform frequency measurements for cell reselection. At this time, the terminal may perform frequency measurements using the following measurement rules based on the cell reselection priority determined in steps 5-25 to minimize battery consumption.

[0138] - If the following condition 1 is satisfied, the terminal may not perform NR intra-frequency measurement. Otherwise (for example, if the following condition 1 is not satisfied), the terminal may perform NR intra-frequency measurement.

[0139] ■ Condition 1: The reception level (Srxlev) of the serving cell is greater than the SIntraSearchP threshold and the reception quality (Squal) of the serving cell is greater than the SIntraSearchQ threshold (Serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ).

[0140] - The terminal can perform measurements according to the 3GPP TS 38.133 standard for NR inter-frequency or inter-RAT frequency that has a higher reselection priority than the NR frequency of the current serving cell.

[0141] - For an NR inter-frequency having a reselection priority lower than or equal to the NR frequency of the current serving cell and an inter-RAT frequency having a reselection priority lower than the NR frequency of the current serving cell, the terminal may not perform measurement if the following condition 2 is satisfied. Otherwise (for example, if the following condition 2 is not satisfied), the terminal may measure cells in the NR inter-frequency having a reselection priority lower than or equal to the NR frequency or measure cells in the inter-RAT frequency having a reselection priority lower than the NR frequency.

[0142] ■ Condition 2: The reception level (Srxlev) of the serving cell is greater than the SnonIntraSearchP threshold and the reception quality (Squal) of the serving cell is greater than the SnonIntraSearchQ threshold (Serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ).

[0143] For reference, the aforementioned thresholds (SintraSearchP, SintraSearchQ, SnonIntraSearchP SnonintraSearchQ) can be broadcast in the system information acquired in steps 5-20.

[0144] If the above terminal supports the relaxed measurement function and the parameter relaxedMeasurement exists in SIB2, the terminal can perform the necessary measurements according to the above-described contents and perform relaxed measurement according to the contents of Table 8.

[0145] A. Relaxed measurement rules- if lowMobilityEvaluation is configured and cellEdgeEvaluation is not configured; and- if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least T SearchDeltaP after (re-)selecting a new cell; and- if the relaxed measurement criterion in clause 5.2.4.9.1 in TS 38.304 is fulfilled for a period of T SearchDeltaP:- the UE may choose to perform relaxed measurements for intra-frequency cells, NR inter-frequency cells or inter-RAT frequency cells according to relaxation methods in clauses 4.2.2.9, 4.2.2.10, 4.2.2.11, 4.2C.2.7 and 4.2C.2.8 in TS 38.133;- if cellEdgeEvaluation is configured and lowMobilityEvaluation is not configured; and- if the relaxed measurement criterion in clause 5.2.4.9.2 in TS 38.304 is fulfilled:- the UE may choose to perform relaxed measurements for intra-frequency cells according to relaxation methods in clauses 4.2.2.9 and 4.2C.2.7 in TS 38.133;- if the serving cell fulfils Srxlev ≤ S nonIntraSearchP or Squal ≤ S nonIntraSearchQ:- the UE may choose to perform relaxed measurements for NR inter-frequency cells or inter-RAT frequency cells according to relaxation methods in clauses 4.2.2.10, 4.2.2.11 and 4.2C.2.8 in TS 38.133;- if both lowMobilityEvaluation and cellEdgeEvaluation are configured:- if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least T SearchDeltaP after (re-)selecting a new cell; and- if the relaxed measurement criterion in clause 5.2.4.9.1 in TS 38.304 is fulfilled for a period of T SearchDeltaP; and- if the relaxed measurement criterion in clause 5.2.4.9.2 in TS 38.304 is fulfilled:- the UE may choose to perform relaxed measurements for NR intra-frequency cells, inter-frequency cells or inter-RAT frequency cells according to relaxation methods in clauses 4.2.2.9, 4.2.2.10, 4.2.2.11, 4.2C.2.7 and 4.2C.2.8 in TS 38.133;- else:- if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least T SearchDeltaP after (re-)selecting a new cell, and the relaxed measurement criterion in clause 5.2.4.9.1 in TS 38.304 is fulfilled for a period of T SearchDeltaP; or,- if the relaxed measurement criterion in clause 5.2.4.9.2 in TS 38.304 is fulfilled:- if combineRelaxedMeasCondition is not configured:- the UE may choose to perform relaxed measurements for intra-frequency cells, NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority according to relaxation methods in clauses 4.2.2.9, 4.2.2.10, 4.2.2.11, 4.2C.2.7 and 4.2C.2.8 in TS 38.133;- if the serving cell fulfils Srxlev ≤ S nonIntraSearchP or Squal ≤ S nonIntraSearchQ:- the UE may choose to perform relaxed measurement for NR inter-frequency cells of higher priority, or inter-RAT frequency cells of higher priority according to relaxation methods in clauses 4.2.2.10, 4.2.2.11 and 4.2C.2.8 in TS 38.133;- if the UE is a RedCap UE; and- if stationaryMobilityEvaluation is configured and cellEdgeEvaluationWhileStationary is not configured; and- if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least TSearchDeltaP-Stationaryafter (re-)selecting a new cell; and- if the relaxed measurement criterion in clause 5.2.4.9.3 in TS 38.304 is fulfilled for a period of TSearchDeltaP-Stationary:- the UE may choose to perform relaxed measurements for intra-frequency cells, NR inter-frequency cells, or inter-RAT frequency cells according to relaxation methods in clauses 4.2B.2.9, 4.2B.2.10, and 4.2B.2.11 in TS 38.133;- if the UE is a RedCap UE; and- if both stationaryMobilityEvaluation and cellEdgeEvaluationWhileStationary are configured:- if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least TSearchDeltaP-Stationaryafter (re-)selecting a new cell; and- if the relaxed measurement criterion in clause 5.2.4.9.4 in TS 38.304 is fulfilled:- the UE may choose to perform relaxed measurements for intra-frequency cells, NR inter-frequency cells, or inter-RAT frequency cells according to relaxation methods in clauses 4.2B.2.9, 4.2B.2.10, and 4.2B.2.11 in TS 38.133;- else:- if combineRelaxedMeasCondition2 is not configured:- if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least TSearchDeltaP-Stationaryafter (re-)selecting a new cell; and- if the relaxed measurement criterion in clause 5.2.4.9.3 in TS 38.304 is fulfilled for a period of TSearchDeltaP-Stationary:- the UE may choose to perform relaxed measurements for intra-frequency cells, NR inter-frequency cells, or inter-RAT frequency cells according to relaxation methods in clauses 4.2B.2.9, 4.2B.2.10, and 4.2B.2.11 in TS 38.133;NOTE 1: It is up to UE implementation when to start performing relaxed measurements in RRC Idle / Inactive if multiple methods are configured.NOTE 2: It is up to UE implementation which relaxation method to perform based on the "allowed" cases as specified in TS 38.133 for RRC Idle / Inactive if multiple methods are configured.The above relaxed measurements and no measurement are not applicable for frequencies that are included in VarMeasIdleConfig, if configured and for which the UE supports dual connectivity or carrier aggregation between those frequencies and the frequency of the current serving cell.B.Relaxed measurement criterion for UE with low mobilityThe relaxed measurement criterion for UE with low mobility is fulfilled when:- (Srxlev. Ref - Srxlev) < S SearchDeltaP ,Where:- Srxlev = current Srxlev value of the serving cell (dB).- Srxlev Ref = reference Srxlev value of the serving cell (dB), set as follows:- After selecting or reselecting a new cell, or- If (Srxlev - Srxlev Ref ) > 0, or- If the relaxed measurement criterion has not been met for T SearchDeltaP :- The UE may set the value of Srxlev Ref to the current Srxlev value of the serving cell.C. Relaxed measurement criterion for UE not at cell edgeThe relaxed measurement criterion for UE not at cell edge is fulfilled when:- Srxlev > S SearchThresholdP , and,- Squal > S SearchThresholdQ , if S SearchThresholdQis configured,Where:- Srxlev = current Srxlev value of the serving cell (dB).- Squal = current Squal value of the serving cell (dB).D. Relaxed measurement criterion for a stationary RedCap UEThe relaxed measurement criterion for a stationary RedCap UE is fulfilled when:- (SrxlevRefStationary- Srxlev) < SSearchDeltaP-Stationary,Where:- Srxlev = current Srxlev value of the serving cell (dB).- SrxlevRefStationary= reference Srxlev value of the serving cell (dB), set as follows:- After selecting or reselecting a new cell, or- If (Srxlev - SrxlevRefStationary) > 0, or- If the relaxed measurement criterion has not been met for TSearchDeltaP-Stationary:- The UE may set the value of SrxlevRefStationaryto the current Srxlev value of the serving cell.E. Relaxed measurement criterion for a stationary RedCap UE not at cell edgeThe relaxed measurement criterion for a stationary RedCap UE not at cell edge is fulfilled when:- the relaxed measurement criterion in clause 5.2.4.9.3 in TS 38.304 is fulfilled for a period of TSearchDeltaP-Stationary,- Srxlev > S. SearchThresholdP2 , and,- Squal > S SearchThresholdQ2 , if S SearchThresholdQ2 is configured.Where:- Srxlev = current Srxlev value of the serving cell (dB).- Squal = current Squal value of the serving cell (dB).

[0146] For reference, the terminal (5-01) 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 per M1*N1DRX cycle and evaluate the cell selection condition (S criterion) of the above-described embodiment. The value for M1 can be determined by the following mathematical expression 2.

[0147] [Equation 2]

[0148] M1=2 if SMTC periodicity (T SMTC ) > 20 ms and DRX cycle < 0.64 second,

[0149] otherwise M1=1.

[0150] The value for N1 can be determined by Table 9 below.

[0151] DRX cycle length [s]Scaling Factor (N1)N serv [number of DRX cycles]FR1FR2 Note10.3218M1*N1*40.645M1*N1*41.284N1*22.563N1*2Note 1: Applies for UE supporting power class 2&3&4. For UE supporting power class 1, N1 = 8 for all DRX cycle length.

[0152] In steps 5-35, a UE in RRC idle mode or RRC disabled state may decide to reselect a cell that satisfies the cell reselection criteria based on the measurement values ​​performed in steps 5-30. Different criteria may be applied to the cell reselection criteria depending on the cell reselection priority. If multiple cells that satisfy the cell reselection criteria have different cell reselection priorities, reselecting a frequency / RAT cell with a higher cell reselection priority may take precedence over reselecting a frequency / RAT cell with a lower priority. Specifically, the UE's behavior with respect to the reselection criteria of an inter-frequency / inter-RAT cell with a higher priority than that of the current serving cell is as follows.

[0153] - First movement:

[0154] ■ If SIB2 is broadcast with a threshold for threshServingLowQ and a specific time (e.g., 1 second) has passed since the terminal camped on the current serving cell, and the signal quality (Squal) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighQ during a specific time interval TreselectionRAT (Squal > ThreshX,HighQ during a time interval TreselectionRAT), the terminal can perform reselection to the inter-frequency / inter-RAT cell.

[0155] - Second movement:

[0156] ■ If the above terminal cannot perform the first operation, it can perform the second operation.

[0157] ■ If a specific time (e.g., 1 second) has passed since the terminal camped on the current serving cell and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighP during a specific time interval TreselectionRAT (Srxlev > ThreshX,HighP during a time interval Treselection-RAT-), the terminal can perform reselection to the inter-frequency / inter-RAT cell.

[0158] Here, the terminal determines the signal quality (Squal), reception level (Srxlev), and threshold values ​​(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 SIB4 broadcast from the serving cell, and the signal quality (Squal), reception level (Srxlev), and threshold (Thresh) of the inter-RAT cell. X,HighQ, Thresh X, HighP), Treselection RAT The values ​​can perform the first or second action based on information contained in SIB5 broadcast from the serving cell.

[0159] For example, SIB4 has Q qualmin value or Q rxlevmin It includes values, etc., and based on this, the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell can be 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 among the cells that satisfy the reselection criteria of the intra-frequency / inter-frequency cell that has the same priority as the frequency of the current serving cell described below.

[0160] In addition, the operation of the terminal for the reselection criteria of the intra-frequency / inter-frequency cell that has the same priority as the frequency of the current serving cell is as follows.

[0161] - Third movement:

[0162] ■ If the signal quality (Squal) and reception level (Srxlev) of an intra-frequency / inter-frequency cell are greater than 0, the cell-specific rank can be derived based on the measured value (RSRP) (The UE may perform ranking of all cells that fulfill the cell selection criterion S). The ranks of the serving cell and neighboring cells can be calculated using the following mathematical expression 3.

[0163] [Equation 3]

[0164] R s = Q meas,s + Q hyst - Qoffsettemp

[0165] R n = Q meas,n - Qoffset - Qoffset temp

[0166] ● Here, Qmeas,s is the RSRP measurement value of the serving cell, Qmeas,n is the RSRP measurement value of the neighboring cells, Qhyst is the hysteresis value of the serving cell, and Qoffset is the offset between the serving cell and the neighboring cells. The Qhyst value is included in SIB2, and the value is commonly used for intra-frequency / inter-frequency cell reselection. In case of intra-frequency cell reselection, Qoffset is signaled per cell, applied only to the indicated cell, and included in SIB3. In case of inter-frequency cell reselection, Qoffset is signaled per cell, applied only to the indicated cell, and included in SIB4. If the Rank of the neighboring cell obtained from the above mathematical expression 3 is greater than the Rank of the serving cell (Rn > Rs), the optimal cell among the neighboring cells is reselected.

[0167] ● Here Qoffset- temp- - may mean connEstFailOffset included in ConnEstFailureControld broadcast in SIB1 as an offset temporarily applied to the cell, and may be applied when an RRC connection fails (e.g., when the T300 timer expires).

[0168] Additionally, the terminal's behavior with respect to the reselection criteria of an inter-frequency / inter-RAT cell with a lower priority than the frequency of the current serving cell is as follows.

[0169] - 4th movement:

[0170] ■ If SIB2 is broadcast with a threshold for threshServingLowQ and a specific time (e.g., 1 second) has passed since the terminal camped on the current serving cell, if the signal quality (Sqaul) 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 inter-frequency / inter-RAT cell.

[0171] - Movement 5:

[0172] ■ If the above terminal cannot perform the 4th operation, it performs the 5th operation.

[0173] ■ If a specific time (e.g., 1 second) has passed since the terminal camped on the current serving cell, and 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 greater than the threshold ThreshX, LowQ- during a specific time interval TreselectionRAT (Srxlev > ThreshX,LowP during a time interval TreselectionRAT), the terminal performs reselection to the inter-frequency / inter-RAT cell.

[0174] Here, the fourth or fifth operation for the inter-frequency cell of the terminal is the thresholds (ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcasted from the serving cell and the signal quality (Squal), reception level (Srxlev), and thresholds (Threh) of the inter-frequency cell included in SIB4 broadcasted from the serving cell. X, LowQ, Thresh X, LowP ), Treselection RAT , and the fourth or fifth operation for the inter-RAT cell of the terminal is performed based on the thresholds (ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcasted from the serving cell and the signal quality (Squal), reception level (Srxlev), and thresholds (ThreshServing, LowP) of the inter-RAT cell included in SIB5 broadcasted 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 It includes values, etc., and derives the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell based on this. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal can reselect the highest ranked cell among the cells that satisfy the reselection criteria of the intra-frequency / inter-frequency cell that has the same priority as the frequency of the current serving cell described below.

[0175] In steps 5-40, a terminal in RRC idle mode or RRC inactive state receives system information (e.g., MIB or SIB1) broadcast from a candidate target cell before finally reselecting a candidate target cell, and determines based on the received system information whether the reception level (Srxlev) and reception quality (Squal) of the candidate target cell satisfy a cell selection criterion called S-criterion (Mathematical Formula 1) (Srxlev > 0 AND Squal > 0). If Mathematical Formula 1 is satisfied and the candidate target cell is suitable, the terminal can reselect the candidate target cell.

[0176] FIG. 6 is a diagram illustrating a terminal supporting a low-power wake-up receiver performing frequency measurement for performing cell reselection in a next-generation mobile communication system according to an embodiment of the present invention.

[0177] A terminal (6-01) according to one embodiment of the present disclosure may be equipped with a Main Radio (MR) (or first module) and a Low Power Wake-Up Receiver (LP-WUR) (or LR or second module) to perform a predetermined operation. The MR (6-02) equipped in the terminal may refer to a transceiver module operating for NR signals / channels apart from low-power wake-up signals / channels (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up), and the LR (6-03) additionally equipped in the terminal may refer to a receiver module operating for receiving / processing signals / channels related to low-power wake-up. Since the power consumption of LR is lower than that of MR, the terminal can achieve power savings by turning off MR and using LR according to certain conditions. To save power, the terminal can determine whether to turn on or off MR based on a low-power wake-up signal received via LR. For reference, the state of the terminal with MR turned off can be referred to as an ultra-deep-sleep state.

[0178] Referring to FIG. 6, in step 6-06, the terminal (6-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (6-05).

[0179] In step 6-07, the terminal (6-01) may transmit a terminal capability information message (UECapabilityInformation) at the request of the base station (6-05). The message may include an indicator indicating whether LR is supported or an indicator indicating whether relaxed measurement can be performed on the serving cell and / or neighboring cells depending on LR support.

[0180] In step 6-08, the base station (6-05) may transmit an RRC connection release message (RRCRelease) to the terminal (6-01). The message may include an indicator indicating whether the terminal may relax the measurement for the serving cell through the MR (6-02) if the serving cell measurement result derived through the LR (6-03) of the terminal satisfies a predetermined condition. The message may include an indicator indicating whether the terminal may relax the measurement for the neighboring cell through the MR (6-02) if the serving cell measurement result derived through the LR (6-03) of the terminal satisfies a predetermined condition. Specific details regarding the relaxed measurement may follow step 6-35 described below.

[0181] In step 6-10, the terminal (6-01) may transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE). This may follow the embodiment described above.

[0182] In step 6-15, the terminal (6-01) can receive system information or essential system information broadcast by the base station (6-05) via MR (6-02). In the present disclosure, the Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as essential system information. The system information or essential system information (MIB or SIB1) may include information applicable to a terminal supporting LR. The information may include at least one of the following:

[0183] - Indicator indicating whether to transmit a Low-Power Synchronization Signal (LP-SS) or configuration information for LP-SS

[0184] - Indicator indicating whether to transmit the Low-Power Wake-up Signal (LP-WUS) or configuration information for LP-WUS.

[0185] In step 6-20, the terminal (6-01) may perform a cell selection procedure based on the system information or essential system information received in step 6-15. This may follow the previously described embodiment. For reference, the terminal (6-01) may perform a cell selection procedure via MR (6-02).

[0186] In step 6-25, the terminal (6-01) may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or a newly defined SIB) containing cell reselection information from the base station (6-05) to perform a cell reselection evaluation procedure. This may follow the embodiment described above. According to an example, information applicable when a terminal (6-01) supporting LR performs a cell reselection evaluation procedure may be broadcast through the system information. For example, at least one of the following or a combination thereof may be included in the system information.

[0187] - Threshold for a specific measurement metric or threshold per measurement metric

[0188] ■ If the above measurement metric is related to LP-SS, it may mean at least one of LP-RSSI (Received Signal Strength Indicator), LP-RSRP (Reference Signal Received Power), LP-RSRQ (Reference Signal Received Quality), and LP-SINR (Signal to Interference plus Noise Ratio).

[0189] ■ If the above measurement metric is related to LP-WUS, it may mean at least one of LP-WUS RSSI, LP-WUS RSRP, LP-WUS RSRQ, and LP-WUS SINR.

[0190] - Time period value T for satisfying measurement metric conditions LP or the number of times value N LP

[0191] - Q rxlevminLP : The minimum signal reception level value of the LP coverage of a cell that supports LP-WUS and / or LP-SS for a terminal that supports LR.

[0192] - QqualminLP : Minimum signal quality level value of LP coverage of a cell that supports LP-WUS and / or LP-SS for a terminal that supports LR.

[0193] - Q rxlevminoffsetLP : LP coverage minimum signal reception level offset value of a cell that supports LP-WUS and / or LP-SS for a terminal that supports LR

[0194] - Q qualminoffsetLP : LP coverage minimum signal quality level offset value of a cell that supports LP-WUS and / or LP-SS for a terminal that supports LR

[0195] - Srxlev LP Threshold and / or Squal for LP Threshold for

[0196] - A period value (T) for which a specific condition for LR must be satisfied S, LP )

[0197] - Threshold (S) that must satisfy certain conditions for LR delta, LP )

[0198] - An indicator indicating whether the terminal may relax the measurement of the serving cell through MR (6-02) when the serving cell measurement result derived through LR (6-03) of the terminal satisfies a predetermined condition.

[0199] - An indicator indicating whether the terminal may relax measurements on surrounding cells through MR (6-02) when the serving cell measurement result derived through LR (6-03) of the terminal satisfies a predetermined condition.

[0200] The above terminal (6-01) can perform a cell reselection evaluation process. The cell reselection evaluation process may refer to a series of processes for determining reselection priorities (reselection priorities handling), performing frequency measurements by applying measurement rules for cell reselection, and evaluating cell reselection criteria to reselect a cell.

[0201] In step 6-30, the terminal (6-01) can determine the cell reselection priority according to the embodiment described above.

[0202] In step 6-35, the terminal (6-01) may perform frequency measurement for cell reselection. The terminal (6-01) according to the present disclosure may measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (6-02) with a measurement cycle longer than the measurement cycle of the aforementioned embodiment 5 (i.e., at least M1*N1DRX cycle), or may not measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (6-02). The above-described terminal operation may be performed if at least one of the following conditions or a combination thereof is satisfied.

[0203] - Condition 1: If the serving cell measurement result measured by the terminal through MR (6-02) satisfies Srxlev > SIntraSearchP and Squal > SIntraSearchQ or Srxlev > S SearchThresholdP and Squal > S SearchThresholdQ if S SearchThresholdQ If is configured satisfies

[0204] - Condition 2: If at least one of the following specific metrics is satisfied for the serving cell measurement result measured by the terminal through LR (6-03):

[0205] ■ LP-RSSI > Common threshold or threshold for LP-RSSI and / or

[0206] ■ LP-RSRP > Common threshold or threshold for LP-RSRP and / or

[0207] ■ LP-RSRQ > Common threshold or threshold for LP-RSRQ and / or

[0208] ■ LP-SINR > Common threshold or threshold for LP-SINR

[0209] - Condition 3: Condition 2 described above is true for the serving cell measurement result measured by the terminal through LR (6-03). LP Satisfied during or N LP If you are satisfied continuously during

[0210] - Condition 4: The serving cell measurement result measured by the terminal through LR (6-03) is Srxlev LP > 0 or Srxlev LP > Srxlev LP If the threshold is met

[0211] where Srxlev LP = Q rxlevmeasLP - (Q rxlevminLP + Q rxlevminoffsetLP ) - P compensation - Qoffset temp

[0212] ■ Q rxlevmeasLP is the value of the received signal level measured by the terminal through LR (6-03) of the serving cell's LP-SS and / or LP-WUS.

[0213] ■ Q rxlevminoffsetLP , P compensation , Q offsettempAt least one of the parameters may not be applicable to the terminal, in which case the terminal may consider the value as 0 (i.e., the parameter Srxlev LP ) may not be taken into consideration.

[0214] - Condition 5: The serving cell measurement result measured by the terminal through LR (6-03) is Squal LP > 0 or Squal LP > Squal LP If the threshold is met

[0215] At this time, Squal LP = Q qualmeasLP - (Q qualminLP + Q qualminoffsetLP ) - Qoffset temp It could be.

[0216] ■ Q qualmeasLP The above terminal is a value measuring the reception quality of the LP-SS and / or LP-WUS of the serving cell through LR (6-03).

[0217] ■ Q qualminoffsetLP , Q offsettemp At least one of the parameters may not be applicable to the terminal, in which case the terminal may consider the value as 0 (i.e., the parameter is Squal LP ) may not be taken into consideration.

[0218] - Condition 8: At least one of conditions 4 and 5 is T S, LP If you are satisfied with the duration

[0219] - Condition 9: The following condition is true for the measurement metric used in Condition 2: T LP If you are satisfied with the duration

[0220] ■ Serving Cell Measurement Metrics ref - Serving cell measurement metric value < measurement metric threshold

[0221] where

[0222] ◆ Serving cell measurement metric = Current value measured by the terminal as a measurement metric for the serving cell through LR (6-03)

[0223] ◆ Serving Cell Measurement Metrics- ref = Baseline measurement metric value for serving cell

[0224] ◆ If a new cell is selected or reselected, or if the serving cell measurement metric value is - the serving cell measurement metric ref > 0 or above -- T LP If condition 9 is not satisfied during the period, the terminal measures the serving cell measurement metric as the serving cell measurement metric. ref can be set to .

[0225] - Condition 10: Srxlev used in condition 4 LP - The following conditions apply to T S, LP If you are satisfied with the duration

[0226] ■ Srxlev LP, Ref - Srxlev LP < S delta, LP

[0227] where

[0228] ◆ Srxlev LP = Current serving cell measurement value measured by the above terminal through LR (6-03)

[0229] ◆ Srxlev LP,Ref = Reference measurement value for serving cell

[0230] ◆ If a new cell is selected or reselected, or if Srxlev LP - Srxlev LP, Ref > 0 or above -- T S, LP If condition 10 is not satisfied during this period, the terminal can set the current serving cell measurement value measured through LR as a reference measurement value for the serving cell.

[0231] - Condition 11: If the serving cell measurement result derived through the LR (6-03) of the terminal satisfies at least one of the conditions described above, the terminal (6-01) instructs to measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (6-02) with a longer period than the measurement period of the embodiment 5 described above (i.e., at least M1*N1DRX cycle), or if an instruction instructing not to measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (6-02) is set through system information or an RRC connection release message.

[0232] For reference, the terminal may turn off MR (6-02) for power saving purposes during periods when it does not need to measure the SS-RSRP level and SS-RSRQ level of the serving cell through MR (6-02). On the other hand, if the above-described condition is not satisfied, the terminal may turn on MR (6-02) to measure the SS-RSRP level and SS-RSRQ level of the serving cell according to the above-described embodiment.

[0233] Additionally, the terminal (6-01) according to the present disclosure may not perform neighboring cell measurements through the MR (6-02) during a period in which it does not need to measure the SS-RSRP level and SS-RSRQ level of the serving cell through the MR (6-02), or may perform relaxed measurements as specified in Table 8 of the aforementioned embodiment (Fig. 5), or may measure neighboring cells with a longer period.

[0234] The above-described peripheral cell measurement operation may also be performed when an indicator indicating whether the terminal may relax measurements on peripheral cells via MR (6-02) is broadcast in the system information or set in the RRC connection release message.

[0235] For reference, if MR(6-02) is for measuring the serving cell, turning off MR(6-02) may result in not measuring the serving cell through MR(6-02), or if MR(6-02) is for measuring the surrounding cells, turning off MR(6-02) may result in not measuring the surrounding cells through MR(6-02), or if MR(6-02) is for measuring, turning off MR(6-02) may result in not performing measurements through MR(6-02).

[0236] In step 6-40, the terminal (6-01) may decide to reselect a cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 6-35. This may follow the embodiment described above.

[0237] In step 6-45, the terminal (6-01) receives system information (e.g., MIB or SIB1) broadcast from the candidate target cell before finally reselecting the candidate target cell, and based on the received system information, determines whether both the cell selection reception signal level value (Srxlev) and the cell selection signal quality value (Squal) of the candidate target cell are greater than 0 (i.e., whether the cell selection criterion is satisfied). If the cell selection criterion is satisfied and the candidate target cell is suitable, the terminal can reselect the candidate target cell.

[0238] FIG. 7 is a diagram illustrating a terminal supporting a low-power wake-up receiver performing frequency measurement for cell reselection in a next-generation mobile communication system according to an embodiment of the present invention.

[0239] A terminal (7-01) according to an embodiment of the present disclosure may be equipped with a Main Radio (MR) (or first module) and a Low Power Wake-Up Receiver (LP-WUR) (or LR or second module) to perform a predetermined operation. The MR (7-02) equipped in the terminal may refer to a transceiver module operating for NR signals / channels apart from low-power wake-up signals / channels (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up), and the LR (7-03) additionally equipped in the terminal may refer to a receiver module operating for receiving / processing signals / channels related to low-power wake-up. Since the power consumption of LR is lower than that of MR, the terminal can achieve power savings by turning off MR and using LR according to certain conditions. To save power, the terminal can determine whether to turn on or off MR based on a signal related to low-power wake-up received via LR. For reference, the state of the terminal with MR turned off can be referred to as an ultra-deep-sleep state.

[0240] Referring to FIG. 7, in step 7-06, the terminal (7-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (7-05).

[0241] In step 7-07, the terminal (7-01) may transmit a terminal capability information message (UECapabilityInformation) at the request of the base station (7-05). This may follow at least one of the embodiments described above. The message may include a capability indicator indicating whether relaxed measurement for neighboring cells can be performed through the MR (7-02) of the terminal according to the base station configuration for each frequency when the serving cell measurement result derived through the LR (7-03) of the terminal satisfies a predetermined condition. The message may also include an indicator indicating whether relaxed measurement for frequencies having a cell reselection priority value higher than the serving frequency can be performed through the MR (7-02) of the terminal according to the base station configuration when the serving cell measurement result derived through the LR (7-03) of the terminal satisfies a predetermined condition.

[0242] In step 7-08, the base station (7-05) may transmit an RRC connection release message (RRCRelease) to the terminal (7-01). This may follow at least one of the embodiments described above. The message may include an indicator indicating whether the terminal may relax measurements via MR (7-02) for each frequency if the serving cell measurement result derived through LR (7-03) of the terminal satisfies a predetermined condition. The message may include an indicator indicating whether the terminal may relax measurements via MR (7-02) for frequencies having a cell reselection priority value higher than the serving frequency if the serving cell measurement result derived through LR (7-03) of the terminal satisfies a predetermined condition. Specific details regarding relaxed measurements may follow step 7-35 described below.

[0243] In step 7-10, the terminal (7-01) may transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE). This may follow the embodiment described above.

[0244] In step 7-15, the terminal (7-01) can receive system information or essential system information broadcast by the base station (7-05) via MR (7-02). In the present disclosure, the Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as essential system information. The system information or essential system information (MIB or SIB1) may include information applicable to a terminal supporting LR. The information may include at least one of the following:

[0245] - Indicator indicating whether to transmit a Low-Power Synchronization Signal (LP-SS) or configuration information for LP-SS

[0246] - Indicator indicating whether to transmit the Low-Power Wake-up Signal (LP-WUS) or configuration information for LP-WUS.

[0247] In step 7-20, the terminal (7-01) may perform a cell selection procedure based on the system information or essential system information received in step 7-15. This may follow the aforementioned embodiment. For reference, the terminal (7-01) may perform a cell selection procedure via MR (7-02).

[0248] In step 7-25, the terminal (7-01) may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or a newly defined SIB) containing cell reselection information from the base station (7-05) to perform a cell reselection evaluation procedure. This may follow at least one of the embodiments described above. According to an example, the system information may broadcast information that can be applied to frequency measurement rules for a cell reselection evaluation procedure by a terminal (7-01) supporting LR. For example, at least one of the following or a combination thereof may be included in the system information.

[0249] - Information indicating whether the terminal may relax the measurement through MR (7-02) for each frequency when the serving cell measurement result derived through LR (7-03) of the terminal satisfies a predetermined condition.

[0250] - Information indicating whether the terminal may relax the measurement through MR (7-02) for frequencies having a cell reselection priority value higher than the serving frequency when the serving cell measurement result derived through LR (7-03) of the terminal satisfies a predetermined condition.

[0251] The above terminal (7-01) can perform a cell reselection evaluation process. The cell reselection evaluation process may refer to a series of processes for determining reselection priorities (reselection priorities handling), performing frequency measurements by applying measurement rules for cell reselection, and evaluating cell reselection criteria to reselect a cell.

[0252] In step 7-30, the terminal (7-01) can determine the cell reselection priority according to the embodiment described above.

[0253] In step 7-35, the terminal (7-01) may perform frequency measurement for cell reselection. The terminal (7-01) according to the present disclosure may measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (7-02) with a measurement cycle longer than the measurement cycle of the aforementioned embodiment 5 (i.e., at least M1*N1DRX cycle), or may not measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (7-02). The above-described terminal operation may be performed if at least one of the following conditions or a combination thereof is satisfied.

[0254] - Condition 1: If the serving cell measurement result measured by the terminal through MR (7-02) satisfies Srxlev > SIntraSearchP and Squal > SIntraSearchQ or Srxlev > S SearchThresholdP and Squal > S SearchThresholdQ if S SearchThresholdQ If is configured satisfies

[0255] - Condition 2: If at least one of the following specific metrics is satisfied for the serving cell measurement result measured by the terminal through LR (7-03):

[0256] ■ LP-RSSI > Common threshold or threshold for LP-RSSI and / or

[0257] ■ LP-RSRP > Common threshold or threshold for LP-RSRP and / or

[0258] ■ LP-RSRQ > Common threshold or threshold for LP-RSRQ and / or

[0259] ■ LP-SINR > Common threshold or threshold for LP-SINR

[0260] - Condition 3: Condition 2 described above is true for the serving cell measurement result measured by the terminal through LR (7-03). LP Satisfied during or N LP If you are satisfied continuously during

[0261] - Condition 4: The serving cell measurement result measured by the above terminal through LR (7-03) is Srxlev LP > 0 or Srxlev LP > Srxlev LP If the threshold is met

[0262] At this time, Srxlev LP = Q rxlevmeasLP - (Q rxlevminLP + Q rxlevminoffsetLP ) - P compensation - Qoffset temp It could be.

[0263] ■ Q rxlevmeasLP is the value of the received signal level measured by the terminal through LR (7-03) of the serving cell's LP-SS and / or LP-WUS.

[0264] ■ Q rxlevminoffsetLP , P compensation , Q offsettemp At least one of the parameters may not be applicable to the terminal, in which case the terminal may consider the value as 0 (i.e., the parameter Srxlev LP ) may not be taken into consideration.

[0265] - Condition 5: The serving cell measurement result measured by the above terminal through LR (7-03) is Squal LP > 0 or Squal LP > Squal LP If the threshold is met

[0266] where Squal LP = Q qualmeasLP - (Q qualminLP + Q qualminoffsetLP ) - Qoffsettemp

[0267] ■ Q qualmeasLP The above terminal is a value measuring the reception quality of the LP-SS and / or LP-WUS of the serving cell through LR (7-03).

[0268] ■ Q qualminoffsetLP , Q offsettemp At least one of the parameters may not be applicable to the terminal, in which case the terminal may consider the value as 0 (i.e., the parameter is Squal LP ) may not be taken into consideration.

[0269] - Condition 8: At least one of conditions 4 and 5 is T S, LP If you are satisfied with the duration

[0270] - Condition 9: The following condition is true for the measurement metric used in Condition 2: T LP If you are satisfied with the duration

[0271] ■ Serving Cell Measurement Metrics ref - Serving cell measurement metric value < measurement metric threshold

[0272] where

[0273] ◆ Serving cell measurement metric = Current value measured by the terminal as a measurement metric for the serving cell through LR (7-03)

[0274] ◆ Serving Cell Measurement Metrics- ref = Baseline measurement metric value for serving cell

[0275] ◆ If a new cell is selected or reselected, or if the serving cell measurement metric value is - the serving cell measurement metric ref > 0 or above -- T LP If condition 9 is not satisfied during the period, the terminal measures the serving cell measurement metric as the serving cell measurement metric. ref can be set to .

[0276] - Condition 10: Srxlev used in condition 4LP - The following conditions apply to T S, LP If you are satisfied with the duration

[0277] ■ Srxlev LP, Ref - Srxlev LP < S delta, LP

[0278] where

[0279] ◆ Srxlev LP = Current serving cell measurement value measured by the above terminal through LR (7-03)

[0280] ◆ Srxlev LP,Ref = Reference measurement value for serving cell

[0281] ◆ If a new cell is selected or reselected, or if Srxlev LP - Srxlev LP, Ref > 0 or above -- T S, LP If condition 10 is not satisfied during this period, the terminal can set the current serving cell measurement value measured through LR as a reference measurement value for the serving cell.

[0282] - Condition 11: If the serving cell measurement result derived through the LR (7-03) of the terminal satisfies at least one of the conditions described above, the terminal (7-01) instructs to measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (7-02) with a longer period than the measurement period of the embodiment 5 described above (i.e., at least M1*N1DRX cycle), or if an instruction instructing not to measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (7-02) is set through system information or an RRC connection release message.

[0283] For reference, the terminal may turn off MR (7-02) for power saving during periods when it does not need to measure the SS-RSRP level and SS-RSRQ level of the serving cell through MR (7-02). On the other hand, if the above-described condition is not satisfied, the terminal may turn on MR (7-02) to measure the SS-RSRP level and SS-RSRQ level of the serving cell according to the above-described embodiment.

[0284] Additionally, the terminal (7-01) according to the present disclosure may not perform neighboring cell measurements through MR (7-02) for the frequencies indicated by the base station during a period in which the terminal does not need to measure the SS-RSRP level and SS-RSRQ level of the serving cell through MR (7-02), or may perform relaxed measurements as specified in Table 8 of the aforementioned embodiment (Fig. 5), or may measure neighboring cells with a longer period. For frequencies that are not indicated, the terminal may perform neighboring cell measurements through MR (7-02) according to the aforementioned embodiment Fig. 5.

[0285] Alternatively, the terminal (7-01) according to the present disclosure may not perform neighboring cell measurements through MR (7-02) for frequencies having a cell reselection priority value that is the same as or lower than the serving frequency during a period in which the SS-RSRP level and SS-RSRQ level of the serving cell need not be measured through MR (7-02), or may perform relaxed measurements as specified in Table 8 of the aforementioned embodiment (Fig. 5), or may measure neighboring cells with a longer period. However, the terminal (7-01) may not perform neighboring cell measurements through MR (7-02) for the serving frequency and frequencies having a high cell reselection priority value during a period in which the terminal (7-01) does not need to measure the SS-RSRP level and SS-RSRQ level of the serving cell through MR (7-02), or may perform relaxed measurements as specified in Table 8 of the aforementioned embodiment (Fig. 5), or may measure neighboring cells with a longer period, or may perform neighboring cell measurements according to the aforementioned embodiment Fig. 5.

[0286] For reference, if MR(7-02) is for measuring the serving cell, turning off MR(7-02) may result in not measuring the serving cell through MR(7-02), or if MR(7-02) is for measuring the surrounding cells, turning off MR(7-02) may result in not measuring the surrounding cells through MR(7-02), or if MR(7-02) is for measuring, turning off MR(7-02) may result in not performing measurements through MR(7-02).

[0287] In step 7-40, the terminal (7-01) may decide to reselect a cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 7-35. This may follow the embodiment described above.

[0288] In step 7-45, the terminal (7-01) receives system information (e.g., MIB or SIB1) broadcast from the candidate target cell before finally reselecting the candidate target cell, and based on the received system information, determines whether both the cell selection reception signal level value (Srxlev) and the cell selection signal quality value (Squal) of the candidate target cell are greater than 0 (i.e., whether the cell selection criterion is satisfied). If the cell selection criterion is satisfied and the candidate target cell is suitable, the terminal can reselect the candidate target cell.

[0289] FIG. 8 is a diagram illustrating a terminal supporting a low-power wake-up receiver performing frequency measurement for performing cell reselection in a next-generation mobile communication system according to an embodiment of the present invention.

[0290] A terminal (8-01) according to an embodiment of the present disclosure may be equipped with a Main Radio (MR) (or first module) and a Low Power Wake-Up Receiver (LP-WUR) (or LR or second module) to perform a predetermined operation. The MR (8-02) equipped in the terminal may refer to a transceiver module operating for NR signals / channels apart from low-power wake-up signals / channels (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up), and the LR (8-03) additionally equipped in the terminal may refer to a receiver module operating for receiving / processing signals / channels related to low-power wake-up. Since the power consumption of LR is lower than that of MR, the terminal can achieve power savings by turning off MR and using LR according to certain conditions. To save power, the terminal can determine whether to turn on or off MR based on a signal related to low-power wake-up received via LR. For reference, the state of the terminal with MR turned off can be referred to as an ultra-deep-sleep state.

[0291] Referring to FIG. 8, in step 8-06, the terminal (8-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (8-05).

[0292] In step 8-07, the terminal (8-01) may transmit a terminal capability information message (UECapabilityInformation) at the request of the base station (8-05). This may follow at least one of the embodiments described above.

[0293] In step 8-08, the NR base station (8-05) may transmit an RRC connection release message (RRCRelease) to the terminal (8-01). This may follow at least one of the embodiments described above.

[0294] In steps 8-10, the terminal (8-01) may transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE). This may follow the embodiment described above.

[0295] In step 8-15, the terminal (8-01) can receive system information or essential system information broadcast by the base station (8-05) via MR (8-02). In the present disclosure, the Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as essential system information. The system information or essential system information (MIB or SIB1) may include information applicable to a terminal supporting LR. The information may include at least one of the following:

[0296] - Indicator indicating whether to transmit a Low-Power Synchronization Signal (LP-SS) or configuration information for LP-SS

[0297] - Indicator indicating whether to transmit the Low-Power Wake-up Signal (LP-WUS) or configuration information for LP-WUS.

[0298] In step 8-20, the terminal (8-01) may perform a cell selection procedure based on the system information or essential system information received in step 8-15. This may follow the aforementioned embodiment. For reference, the terminal (8-01) may perform a cell selection procedure via MR (8-02).

[0299] In step 8-25, the terminal (8-01) may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, or a newly defined SIB) containing cell reselection information from the base station (8-05) to perform a cell reselection evaluation procedure. This may follow the embodiment described above. According to one embodiment, information applicable when a terminal (8-01) supporting LR performs a cell reselection evaluation procedure may be broadcast through the system information. For example, at least one of the following or a combination thereof may be included in the system information.

[0300] - Threshold for a specific measurement metric or threshold per measurement metric

[0301] ■ If the above measurement metric is about LP-, it may mean at least one of LP-RSSI (Received Signal Strength Indicator), LP-RSRP (Reference Signal Received Power), LP-RSRQ (Reference Signal Received Quality), and LP-SINR (Signal to Interference plus Noise Ratio).

[0302] ■ If the above measurement metric is related to LP-WUS, it may mean at least one of LP-WUS RSSI, LP-WUS RSRP, LP-WUS RSRQ, and LP-WUS SINR.

[0303] ■ The above thresholds can be signaled separately for intra-frequency and non-intra-frequency frequencies (e.g., inter-frequency).

[0304] - Time period value T for satisfying measurement metric conditions LP or the number of times value N LP

[0305] ■ Above T LP - or N LP can be signaled separately for intra-frequency and non-intra-frequency (e.g., inter-frequency) frequencies.

[0306] - Srxlev LP Threshold and / or Squal for LP Threshold for

[0307] ■ The above thresholds can be signaled separately for intra-frequency and non-intra-frequency frequencies (e.g., inter-frequency).

[0308] - A period value (T) for which a specific condition for LR must be satisfied S, LP )

[0309] ■ The above period values ​​can be signaled separately for intra-frequency and non-intra-frequency (e.g. inter-frequency).

[0310] The above terminal (8-01) can perform a cell reselection evaluation process. The cell reselection evaluation process may refer to a series of processes for determining reselection priorities (reselection priorities handling), performing frequency measurements by applying measurement rules for cell reselection, and evaluating cell reselection criteria to reselect a cell.

[0311] In step 8-30, the terminal (8-01) can determine the cell reselection priority according to the embodiment described above.

[0312] In step 8-35, the terminal (8-01) may perform frequency measurement for cell reselection. The terminal (8-01) may measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (8-02) with a period longer than the period (i.e., at least M1*N1DRX cycle) of the above-described embodiment (FIG. 5), or may not measure the SS-RSRP level and SS-RSRQ level for the serving cell through MR (8-02). The above-described terminal operation may be performed according to at least one of the above-described embodiments. For reference, the terminal may turn off the MR (8-02) for power saving during a period in which it does not need to measure the SS-RSRP level and SS-RSRQ level of the serving cell through MR (8-02). That is, if the above-described condition is not satisfied, the terminal can turn on MR (8-02) to measure the SS-RSRP level and SS-RSRQ level of the serving cell according to the above-described embodiment.

[0313] Additionally, the terminal (8-01) according to the present disclosure may measure surrounding cells through MR (8-02) with a longer measurement period than that of the aforementioned embodiment 5, or may not measure surrounding cells. The above-described terminal operation may be performed if at least one or a combination of the following conditions is satisfied.

[0314] - Condition 1: If the serving cell measurement result measured by the terminal through MR (8-02) satisfies Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ or if Srxlev > SSearchThresholdP and Squal > SSearchThresholdQ if SSearchThresholdQ is configured.

[0315] - Condition 2: If at least one of the following specific metrics is satisfied for the serving cell measurement result measured by the terminal through LR (8-03):

[0316] ■ LP-RSSI > Common threshold or surrounding frequency threshold other than serving frequency for LP-RSSI and / or

[0317] ■ LP-RSRP > Common threshold or peripheral frequency threshold other than serving frequency for LP-RSRP and / or

[0318] ■ LP-RSRQ > Common threshold or peripheral frequency threshold other than the serving frequency for LP-RSRQ and / or

[0319] ■ LP-SINR > Common threshold or peripheral frequency threshold other than serving frequency for LP-SINR

[0320] - Condition 3: Condition 2 described above is true for the serving cell measurement result measured by the terminal through LR (8-03). LP (Parameters signaled while applied to surrounding frequencies other than the serving frequency) satisfied or NLP (parameters signaled while applied to surrounding frequencies other than the serving frequency) are continuously satisfied during

[0321] - Condition 4: The serving cell measurement result measured by the terminal through LR (8-03) is Srxlev LP > 0 or Srxlev LP > Srxlev LP If the threshold is met

[0322] ■ At this time, Srxlev LP The threshold is applied to the surrounding frequencies while the serving frequency is not the signaled parameter.

[0323] - Condition 5: The serving cell measurement result measured by the terminal through LR (8-03) is Squal LP > 0 or Squal LP > Squal LP If the threshold is met

[0324] ■ At this time, Squal LP The threshold is applied to the surrounding frequencies while the serving frequency is not the signaled parameter.

[0325] - Condition 6: At least one of conditions 4 and 5 is T S, LP If you are satisfied with the duration

[0326] ■ At this time, T S, LP - The value is applied to the surrounding frequencies while not serving the parameter signaled.

[0327] In step 8-40, the terminal (8-01) may decide to reselect a cell that satisfies the cell reselection criteria based on the measurement values ​​performed in step 8-35. This may follow the embodiment described above.

[0328] In step 8-45, the terminal (8-01) receives system information (e.g., MIB or SIB1) broadcast from the candidate target cell before finally reselecting the candidate target cell, and based on the received system information, determines whether both the cell selection reception signal level value (Srxlev) and the cell selection signal quality value (Squal) of the candidate target cell are greater than 0 (i.e., whether the cell selection criterion is satisfied). If the cell selection criterion is satisfied and the candidate target cell is suitable, the terminal can reselect the candidate target cell.

[0329] Figure 9 is a block diagram showing the internal structure of a terminal according to one embodiment of the present invention.

[0330] Referring to the above drawing, the terminal includes an RF (Radio Frequency) processing unit (9-10), a baseband processing unit (9-20), a storage unit (9-30), and a control unit (9-40).

[0331] The RF processing unit (9-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (9-10) up-converts the baseband signal provided from the baseband processing unit (9-20) 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 (9-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In the drawing, only one antenna is shown, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (9-10) may include multiple RF chains. Furthermore, the RF processing unit (9-10) may perform beamforming. For the above beamforming, the RF processing unit (9-10) can adjust the phase and size of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit can perform MIMO, and can receive multiple layers when performing the MIMO operation.

[0332] The baseband processing unit (9-20) above performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (9-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (9-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (9-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (9-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit (9-20) divides the baseband signal provided from the RF processing unit (9-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform), and then restores the received bit string through demodulation and decoding.

[0333] The baseband processing unit (9-20) and the RF processing unit (9-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (9-20) and the RF processing unit (9-10) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (9-20) and the RF processing unit (9-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit (9-20) and the RF processing unit (9-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Additionally, the different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band and a millimeter wave (mm wave) (e.g., 60GHz) band.

[0334] The storage unit (9-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (9-30) can store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (9-30) provides the stored data at the request of the control unit (9-40).

[0335] The control unit (9-40) controls the overall operations of the terminal. For example, the control unit (9-40) transmits and receives signals through the baseband processing unit (9-20) and the RF processing unit (9-10). In addition, the control unit (9-40) records and reads data in the storage unit (9-40). For this purpose, the control unit (9-40) may include at least one processor. For example, the control unit (9-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0336] Figure 10 is a block diagram showing the configuration of an NR base station according to one embodiment of the present invention.

[0337] As shown in the above drawing, the base station is configured to include an RF processing unit (10-10), a baseband processing unit (10-20), a backhaul communication unit (10-30), a storage unit (10-40), and a control unit (10-50).

[0338] 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 from 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, an ADC, etc. In the drawing, only one antenna is shown, but the first access node may have 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 size of each signal transmitted and received through multiple antennas or antenna elements. The RF processing unit can perform a downlink MIMO operation by transmitting one or more layers.

[0339] The baseband processing unit (10-20) performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (10-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (10-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit (10-20) divides the baseband signal provided from the RF processing unit (10-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operation, and then restores the received bit string through demodulation and decoding. 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 transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0340] The above backhaul communication unit (10-30) provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (10-30) converts a bit string transmitted from the main base station to another node, such as an auxiliary base station or core network, into a physical signal, and converts a physical signal received from the other node into a bit string.

[0341] The storage unit (10-40) stores data such as basic programs, application programs, and setting information for the operation of the main base station. In particular, the storage unit (10-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. In addition, the storage unit (10-40) can store information that serves as a judgment criterion for whether to provide or terminate multiple connections to a terminal. In addition, the storage unit (10-40) provides the stored data at the request of the control unit (10-50).

[0342] The control unit (10-50) controls the overall operations of the base station. For example, the control unit (10-50) transmits and receives signals through the baseband processing unit (10-20) and the RF processing unit (10-10) or through the backhaul communication unit (10-30). In addition, the control unit (10-50) records and reads data in the storage unit (10-40). For this purpose, the control unit (10-50) may include at least one processor.

Claims

1. A method performed by a terminal supporting a first receiving module and a second receiving module of a wireless communication system, A step of receiving system information including setting information related to a low-power wake-up signal through the first receiving module; A step of measuring a low-power wake-up signal through the second receiving module based on the information related to the low-power wake-up signal; A step of identifying whether the first condition is satisfied based on the measurement result of the low-power wake-up signal; and A method comprising the step of determining whether to stop serving cell measurement via the first receiving module or whether to perform relaxed serving cell measurement via the first receiving module based on whether the first condition is satisfied.

2. In paragraph 1, A step of identifying whether the second condition is satisfied based on the measurement result of the low-power wake-up signal; and A method further comprising the step of determining whether to perform relaxed neighboring cell measurement via the first receiving module based on whether the second condition is satisfied.

3. In paragraph 1, A method characterized in that whether the first condition is satisfied is identified based on at least one of the received signal strength indicator (RSSI), the received signal received power (RSRP), the received signal received quality (RSRQ), or the signal to interference plus noise ratio (SINR) of the low-power wake-up signal.

4. In paragraph 2, A method characterized in that whether the second condition is satisfied is identified based on whether the serving cell measurement value through the second receiving module is equal to or greater than a preset threshold value.

5. In paragraph 2, A method characterized in that whether the second condition is satisfied is identified based on whether a value obtained by subtracting a serving cell measurement value through the second receiving module from a specific reference value is equal to or less than a preset threshold value.

6. In paragraph 1, A method characterized in that the information related to the low-power wake-up signal includes at least one of a setting for a low-power synchronization signal or a setting for the low-power wake-up signal.

7. In paragraph 1, A method further comprising the step of transmitting a terminal capability message, the terminal capability message including an indicator indicating whether the terminal supports the second module or whether the terminal supports at least one feature associated with the second module.

8. In a terminal supporting the first receiving module and the second receiving module of a wireless communication system, Transmitter and receiver; and comprising a control unit, said control unit comprising: Through the first receiving module, system information including setting information related to a low-power wake-up signal is received through the transceiver, Based on the information related to the above low-power wake-up signal, the low-power wake-up signal is measured through the second receiving module, Based on the measurement result of the above low-power wake-up signal, identify whether the first condition is satisfied, A terminal characterized in that it is configured to determine whether to stop serving cell measurement through the first receiving module or whether to perform relaxed serving cell measurement through the first receiving module based on whether the first condition is satisfied.

9. In paragraph 8, The above control unit, Based on the measurement result of the above low-power wake-up signal, identify whether the second condition is satisfied, A terminal characterized in that it is configured to determine whether to perform relaxed neighboring cell measurement through the first receiving module based on whether the second condition is satisfied.

10. In paragraph 8, A terminal characterized in that whether the first condition is satisfied is identified based on at least one of the received signal strength indicator (RSSI), the received signal received power (RSRP), the received signal received quality (RSRQ), or the signal to interference plus noise ratio (SINR) of the low-power wake-up signal.

11. In paragraph 9, A terminal characterized in that whether the second condition is satisfied is identified based on whether the serving cell measurement value through the second receiving module is equal to or greater than a preset threshold value.

12. In paragraph 9, A terminal characterized in that whether the second condition is satisfied is identified based on whether a value obtained by subtracting a serving cell measurement value through the second receiving module from a specific reference value is equal to or less than a preset threshold value.

13. In paragraph 8, A terminal characterized in that the information related to the low-power wake-up signal includes at least one of a setting for a low-power synchronization signal or a setting for the low-power wake-up signal.

14. In paragraph 8, The above control unit, A terminal configured to transmit, through the transceiver, a terminal capability message including an indicator indicating whether the terminal supports the second module or whether the terminal supports at least one function associated with the second module.

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