Method and apparatus for RRM measurement in communication system

Abstract

Disclosed are a method and apparatus for RRM measurement in a communication system. The method for a terminal includes the steps of: performing a first measurement operation with respect to a first signal received from a base station by using main radio of the terminal; comparing a result of the first measurement operation with a first threshold value; and if the result of the first measurement operation is equal to or greater than the first threshold value, performing a second measurement operation with respect to a second signal received from the base station by using a low-power receiver of the terminal.

Description

Method and device for measuring RRM in communication systems

[0001] The present disclosure relates to a radio resource management (RRM) measurement technique in a communication system, and more particularly, to a RRM measurement technique in a terminal supporting low-power operation.

[0002] With the advancement of information and communication technology, various wireless communication technologies are being developed. Representative wireless communication technologies include LTE (long term evolution), LTE-A (advanced), and NR (new radio), all of which are defined by the 3rd generation partnership project (3GPP) standards. LTE and / or LTE-A may be considered 4G (4th Generation) communication technologies. NR may be considered 5G (5th Generation) communication technologies.

[0003] In order to handle the rapidly increasing amount of wireless data following the commercialization of 4G communication systems (e.g., communication systems supporting LTE and / or LTE-A), 5G communication systems (e.g., communication systems supporting NR) that use frequency bands higher than the frequency bands of 4G communication systems (e.g., frequency bands below 6 GHz) as well as frequency bands lower than the frequency bands of 4G communication systems are being considered. 5G communication systems may support enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communication (URLLC), and / or massive Machine Type Communication (mMTC).

[0004] To reduce power consumption of a terminal in a 5G communication system, a low-power wake-up signal and a low-power wake-up receiver for receiving the low-power wake-up signal may be considered. The terminal may perform radio resource management (RRM) measurements of the communication system using a 5G receiver (e.g., a legacy receiver). The terminal may perform RRM measurements of the communication system using a low-power wake-up receiver. If RRM measurements are performed using the low-power wake-up receiver of the terminal, the power consumption of the terminal for RRM measurements may be reduced. RRM measurement methods supporting the above-described operations may be required.

[0005] Meanwhile, the technology that serves as the background for the invention is written to promote understanding of the background for the invention, and may include content that is not a prior art already known to a person with ordinary skill in the field to which the technology belongs.

[0006] The purpose of the present disclosure to solve the above problems is to provide a method and device for RRM (radio resource management) measurement in a communication system.

[0007] According to embodiments of the present disclosure for achieving the above object, a method of a terminal includes the steps of performing a first measurement operation on a first signal received from a base station using a main radio of the terminal; comparing a result of the first measurement operation with a first threshold; and performing a second measurement operation on a second signal received from the base station using a low-power receiver of the terminal when the result of the first measurement operation is equal to or greater than the first threshold.

[0008] The method of the terminal may further include a step of comparing the result of the second measurement operation with a second threshold; and a step of performing the first measurement operation on the first signal received from the base station using the main radio without performing the second measurement operation if the result of the second measurement operation is less than or equal to the second threshold.

[0009] The method of the terminal may further include a step of receiving measurement setting information from the base station, wherein the measurement setting information may include at least one of information for the first measurement operation, information for the second measurement operation, the first threshold, or the second threshold.

[0010] The first threshold and the second threshold may be set to different values.

[0011] When the second measurement operation is performed, the first measurement operation may be stopped.

[0012] The first measurement operation may be a measurement operation for at least one of a serving cell or an adjacent cell, and the second measurement operation may be a measurement operation for the serving cell.

[0013] Each of the first measurement operation and the second measurement operation may be a radio resource management (RRM) measurement operation.

[0014] The first signal may be a legacy measurement signal, the second signal may be a low-power measurement signal, the legacy measurement signal may include at least one of a synchronization signal or a reference signal, and the low-power measurement signal may include at least one of a low-power wake-up signal or a low-power synchronization signal.

[0015] According to embodiments of the present disclosure for achieving the above object, a method of a terminal includes the steps of performing a first measurement operation on a first signal received from a base station using a main radio of the terminal; comparing a result of the first measurement operation with a first threshold; and performing a first relaxed measurement operation on the first signal received from the base station using the main radio when the result of the first measurement operation is equal to or greater than the first threshold.

[0016] The cycle of the first relaxed measurement operation may be set longer than the cycle of the first measurement operation.

[0017] The method of the terminal may further include a step of performing a second measurement operation on a second signal received from the base station using a low-power receiver of the terminal when the result of the first measurement operation is equal to or greater than the first threshold.

[0018] The method of the terminal may further include the step of comparing the result of the second measurement operation with a second threshold; and, if the result of the second measurement operation is less than or equal to the second threshold, the step of performing the first measurement operation on the first signal received from the base station using the main radio without performing the first relaxed measurement operation and the second measurement operation.

[0019] The method of the terminal may further include a step of receiving measurement setting information from the base station, wherein the measurement setting information may include at least one of information for the first measurement operation, information for the first relaxed measurement operation, information for the second measurement operation, the first threshold, or the second threshold.

[0020] The first threshold and the second threshold may be set to different values.

[0021] Each of the first measurement operation and the first relaxed measurement operation may be a measurement operation for at least one of a serving cell or an adjacent cell, and the second measurement operation may be a measurement operation for the serving cell.

[0022] The first signal may be a legacy measurement signal, the second signal may be a low-power measurement signal, the legacy measurement signal may include at least one of a synchronization signal or a reference signal, and the low-power measurement signal may include at least one of a low-power wake-up signal or a low-power synchronization signal.

[0023] According to embodiments of the present disclosure for achieving the above object, a terminal includes a main radio; a low power receiver; and at least one processor, wherein the at least one processor causes the terminal to perform a first measurement operation on a first signal received from a base station using the main radio; compare a result of the first measurement operation with a first threshold; and, when the result of the first measurement operation is equal to or greater than the first threshold, cause the terminal to perform a second measurement operation on a second signal received from the base station using the low power receiver.

[0024] The at least one processor may further cause the terminal to compare the result of the second measurement operation with a second threshold; and, if the result of the second measurement operation is less than or equal to the second threshold, perform the first measurement operation on the first signal received from the base station using the main radio without performing the second measurement operation.

[0025] The at least one processor may further cause the terminal to receive measurement configuration information from the base station, wherein the measurement configuration information may include at least one of information for the first measurement operation, information for the second measurement operation, the first threshold, or the second threshold.

[0026] The first measurement operation may be a measurement operation for at least one of a serving cell or an adjacent cell, and the second measurement operation may be a measurement operation for the serving cell.

[0027] According to the present disclosure, a terminal may include a low-power receiver and a main radio. The terminal may perform a radio resource management (RRM) measurement operation using the main radio, and if the result of the RRM measurement operation is greater than or equal to a threshold, the terminal may perform the RRM measurement operation using the low-power receiver. Alternatively, if the result of the RRM measurement operation is greater than or equal to a threshold, the terminal may perform a relaxed RRM measurement operation using the main radio and an RRM measurement operation using the low-power receiver. Accordingly, the RRM measurement operation of the terminal may be improved, the power consumption of the terminal during RRM measurement may be reduced, and the performance of the communication system may be enhanced.

[0028] Figure 1 is a conceptual diagram illustrating embodiments of a communication network.

[0029] Figure 2 is a block diagram illustrating embodiments of communication nodes constituting a communication network.

[0030] Figure 3 is a conceptual diagram illustrating embodiments of system frames in a communication network.

[0031] Figure 4 is a conceptual diagram illustrating embodiments of subframes in a communication network.

[0032] Figure 5 is a conceptual diagram illustrating embodiments of slots in a communication network.

[0033] Figure 6 is a conceptual diagram illustrating embodiments of signal monitoring operations in a communication network.

[0034] Figure 7 is a conceptual diagram illustrating embodiments of RRC state changes of a terminal in a communication network.

[0035] Figure 8 is a block diagram illustrating embodiments of communication nodes that constitute a communication network.

[0036] FIG. 9 is a flowchart illustrating embodiments of a method for receiving a low-power synchronization signal in a communication network.

[0037] FIG. 10 is a flowchart illustrating embodiments of a method for measuring RRM using a low-power RRM signal (e.g., a low-power synchronization signal) in a communication network.

[0038] FIG. 11 is a flowchart illustrating embodiments of RRM measurement switching operations in a communication network.

[0039] FIG. 12 is a flowchart illustrating embodiments of an RRM measurement operation using a low-power RRM signal (e.g., a low-power synchronization signal) in a communication network.

[0040] This disclosure may be subject to various modifications and various embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the disclosure to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the disclosure.

[0041] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" encompasses any combination of multiple related items or any one of multiple related items.

[0042] In the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Furthermore, in the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.”

[0043] In the present disclosure, (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission,” (re)setting may mean “setting,” “resetting,” or “setting and resetting,” (re)connection may mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection.”

[0044] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0045] The terminology used in this disclosure is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0046] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0047] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding in describing the present disclosure, identical reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted.

[0048] A communication network to which embodiments of the present disclosure are applied will be described. The communication network to which embodiments of the present disclosure are applied is not limited to the scope described below, and embodiments of the present disclosure may be applied to various communication networks. Here, "communication network" may be used interchangeably with "communication system." "Communication network" may refer to a wireless communication network, and "communication system" may refer to a wireless communication system.

[0049] In the present disclosure, “an operation (e.g., a transmission operation) is set” may mean that “setting information for the operation (e.g., an information element, a parameter)” and / or “information instructing performance of the operation” are signaled. “An information element (e.g., a parameter) is set” may mean that the information element is signaled. In the present disclosure, the signaling may be at least one of system information (SI) signaling (e.g., transmission of a system information block (SIB) and / or a master information block (MIB)), RRC signaling (e.g., transmission of RRC parameters and / or upper layer parameters), MAC control element (CE) signaling, or PHY signaling (e.g., transmission of downlink control information (DCI), uplink control information (UCI), and / or sidelink control information (SCI)).

[0050] Figure 1 is a conceptual diagram illustrating embodiments of a communication network.

[0051] Referring to FIG. 1, the base station (110) can support cellular communication (e.g., long term evolution (LTE), advanced LTE-A, LTE-A Pro, unlicensed LTE-U, new radio (NR), unlicensed NR-U, etc. as defined in the 3rd generation partnership project (3GPP) standard). The base station (110) can support multiple input multiple output (MIMO) (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP), carrier aggregation (CA), etc. The terminal (120) can perform communication (e.g., uplink communication and / or downlink communication) with the base station (110).

[0052] The communication nodes (e.g., base stations, terminals, etc.) that constitute the communication network described above can support a communication protocol based on CDMA (code division multiple access), a communication protocol based on WCDMA (wideband CDMA), a communication protocol based on TDMA (time division multiple access), a communication protocol based on FDMA (frequency division multiple access), a communication protocol based on SC (single carrier)-FDMA, a communication protocol based on OFDM (orthogonal frequency division multiplexing), a communication protocol based on OFDMA (orthogonal frequency division multiple access), etc.

[0053] Among communication nodes, a base station may be referred to as a NodeB, an evolved NodeB, a 5g NodeB (gNodeB), a BTS (base transceiver station), a radio base station, a radio transceiver, an access point, an access node, a Tx / Rx Point, etc. Among communication nodes, a terminal may be referred to as a UE (user equipment), an access terminal, a mobile terminal, a station, a subscriber station, a portable subscriber station, a mobile station, a node, a device, etc. A communication node may have the following structure.

[0054] Figure 2 is a block diagram illustrating embodiments of communication nodes constituting a communication network.

[0055] Referring to FIG. 2, a communication node (200) may include at least one processor (210), a memory (220), or at least one of a transmission / reception device (230) that is connected to a network and performs communication. In addition, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) and communicate with each other.

[0056] However, each component included in the communication node (200) may be connected through an individual interface or individual bus centered around the processor (210), rather than a common bus (270). For example, the processor (210) may be connected to at least one of a memory (220), a transmission / reception device (230), an input interface device (240), an output interface device (250), and a storage device (260) through a dedicated interface.

[0057] The processor (210) can execute program commands stored in at least one of the memory (220) and the storage device (260). The processor (210) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which the methods according to embodiments of the present disclosure are performed. Each of the memory (220) and the storage device (260) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0058] Next, the operating methods of communication nodes in a communication network will be described. Even if a method (e.g., transmitting or receiving a signal) performed by a first communication node among the communication nodes is described, a corresponding second communication node can perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed by the first communication node. In other words, if the operation of a first terminal (e.g., a transmitting terminal) is described, a corresponding second terminal (e.g., a receiving terminal) can perform an operation corresponding to the operation of the first terminal. Conversely, if the operation of a second terminal is described, a corresponding first terminal can perform an operation corresponding to the operation of the second terminal.

[0059] Figure 3 is a conceptual diagram illustrating embodiments of a system frame in a communication network.

[0060] Referring to FIG. 3, time resources in a communication network can be divided into frame units. For example, system frames can be set consecutively in the time domain of the communication network. The length of a system frame can be 10 ms (milliseconds). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication network. For example, the SFN of the system frame following system frame #1023 can be #0.

[0061] A system frame may include two half frames. A half frame may be 5 ms long. A half frame located at the beginning of the system frame may be referred to as "half frame #0," and a half frame located at the end of the system frame may be referred to as "half frame #1." A system frame may include 10 subframes. A subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as "subframes #0-9."

[0062] Figure 4 is a conceptual diagram illustrating embodiments of subframes in a communication network.

[0063] Referring to FIG. 4, one subframe may include n slots, where n may be a natural number. Accordingly, one subframe may be composed of one or more slots.

[0064] Figure 5 is a conceptual diagram illustrating embodiments of slots in a communication network.

[0065] Referring to FIG. 5, a slot may include one or more symbols. A slot illustrated in FIG. 5 may include 14 symbols. The length of a slot may vary depending on the number of symbols included in the slot and the symbol length. Alternatively, the length of a slot may vary depending on the numerology. If the subcarrier spacing is 15 kHz (e.g., μ=0), the slot length may be 1 ms. In this case, one system frame may include 10 slots. If the subcarrier spacing is 30 kHz (e.g., μ=1), the slot length may be 0.5 ms. In this case, one system frame may include 20 slots.

[0066] When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, one system frame can contain 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, one system frame can contain 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, one system frame can contain 160 slots.

[0067] A symbol may be configured as a downlink symbol, a flexible symbol, or an uplink symbol. A slot consisting of only DL (downlink) symbols may be referred to as a "DL slot," a slot consisting of only FL symbols may be referred to as a "FL (flexible) slot," and a slot consisting of only UL (uplink) symbols may be referred to as a "UL slot."

[0068] The reference signal may be a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), a phase tracking-reference signal (PT-RS), etc. The channel may be a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), etc. In the present disclosure, the control channel may mean a PDCCH, a PUCCH, or a PSCCH, and the data channel may mean a PDSCH, a PUSCH, or a PSSCH.

[0069] Next, methods for transmitting and receiving signals in a communication network (e.g., a communication system) will be described. In downlink communication, downlink data may be transmitted via a PDSCH. In uplink communication, uplink data may be transmitted via a PUSCH. In the present disclosure, a PDSCH may refer to downlink data and / or a resource through which the downlink data is transmitted and received, and a PUSCH may refer to uplink data and / or a resource through which the uplink data is transmitted and received. A base station may transmit downlink control information (DCI) including configuration information of the PDSCH (e.g., resource allocation information, scheduling information) through a physical downlink control channel (PDCCH). In the present disclosure, a PDCCH may refer to DCI (e.g., control information) and / or a resource through which the DCI is transmitted.

[0070] The terminal can receive DCI on the PDCCH and check the configuration information of the PDSCH included in the DCI. For example, the configuration information of the PDSCH may include time domain resource assignment (TDRA), frequency domain resource assignment (FDRA), transmission resource information for feedback on the PDSCH, and / or modulation and coding scheme (MCS) information. The TDRA may indicate the resource region of the PDSCH in the time domain. The FDRA may indicate the resource region of the PDSCH in the frequency domain. The MCS information may be an MCS level or an MCS index.

[0071] A base station can configure a bandwidth part (BWP) for downlink communication. The BWP can be configured differently for each terminal. The base station can inform the terminal of BWP configuration information using higher layer signaling. The number of BWPs configured for one terminal can be one or more. The terminal can receive BWP configuration information from the base station and check the BWP(s) configured by the base station based on the BWP configuration information. If multiple BWPs are configured for downlink communication, the base station can activate one or more BWPs among the multiple BWPs. The base station can transmit configuration information of the activated BWP(s) to the terminal using at least one of higher layer signaling, a medium access control (MAC) control element (CE), or DCI. The base station can perform downlink communication using the activated BWP(s). The terminal can identify the activated BWP(s) by receiving configuration information of the activated BWP(s) from the base station, and can perform a downlink reception operation (e.g., downlink communication) in the activated BWP(s).

[0072] In this disclosure, methods for monitoring PDCCH will be described. A terminal may perform a monitoring operation for a PDCCH to receive a PDSCH transmitted from a base station. The monitoring operation for the PDCCH may be referred to as a PDCCH monitoring operation. The base station may inform the terminal of configuration information for the PDCCH monitoring operation using a higher layer message (e.g., a radio resource control (RRC) message). The configuration information for the PDCCH monitoring operation may include CORESET (control resource set) information and / or search space information.

[0073] CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH occasion information, etc. The PDCCH DMRS may be a DMRS used to demodulate the PDCCH. The PDCCH occasion may be a region where the PDCCH can exist. In other words, the PDCCH occasion may be a region where DCI can be transmitted. The PDCCH occasion information may include time resource information and / or frequency resource information of the PDCCH occasion. In the time domain, the length of the PDCCH occasion may be indicated in symbol units. In the frequency domain, the size of the PDCCH occasion may be indicated in RB units (e.g., in PRB (physical resource block) units or CRB (common resource block) units).

[0074] The search space information may include a coreset identifier (ID) associated with the search space, a period and / or offset of PDCCH monitoring. Each of the period and offset of PDCCH monitoring may be indicated on a slot-by-slot basis. The search space information may further include an index of the symbol at which the PDCCH monitoring operation begins.

[0075] Next, paging methods in a communication network will be described. The state of a terminal (e.g., RRC state) can be divided into an RRC Connected state, an RRC Inactive state, and an RRC Idle state depending on the state of the RRC configuration (e.g., RRC connection) for the base station. The state of the terminal can change depending on the RRC configuration with the base station, etc. For example, if the terminal has established an RRC connection with the base station, the state of the terminal can be an RRC Connected state. If the RRC connection between the terminal and the base station is released, the state of the terminal can be changed to an RRC Idle state. If the RRC connection between the terminal and the base station is suspended, the state of the terminal can be changed to an RRC Inactive state.

[0076] Depending on the state of the terminal (e.g., RRC connected state, RRC inactive state, RRC idle state), the signal monitoring operation of the terminal may vary. In the RRC connected state, the terminal may perform the signal monitoring operation based on the configuration of the CORESET and search space. In the RRC inactive state or RRC idle state, the terminal may periodically perform the signal monitoring operation in a specific time interval according to the configuration of the terminal, and may not perform the signal monitoring operation in the remaining time intervals. The terminal not performing the signal monitoring operation may mean that the terminal operates in sleep mode. The terminal performing the signal monitoring operation may mean that the terminal operates in active mode.

[0077] Figure 6 is a conceptual diagram illustrating embodiments of signal monitoring operations in a communication network.

[0078] Referring to FIG. 6, a terminal can periodically perform a signal monitoring operation throughout the entire time interval. The signal monitoring operation can be performed in the signal monitoring interval. The signal monitoring interval can exist periodically. The base station can transmit configuration information of the signal monitoring interval to the terminal through signaling. The terminal can receive configuration information of the signal monitoring interval through signaling from the base station. The configuration information of the signal monitoring interval can include at least one of the time length of one signal monitoring interval, the period of the signal monitoring interval, or the time offset of the signal monitoring interval. The signal monitoring interval can include an on interval and an off interval. The configuration information of the signal monitoring interval can include information about the on interval and / or information about the off interval. The terminal can perform the signal monitoring operation in the on interval. The terminal may not perform the signal monitoring operation in the off interval. Since the signal monitoring operation of the terminal is not performed in the off interval within the signal monitoring interval, the power consumption of the terminal can be reduced.

[0079] Figure 7 is a conceptual diagram illustrating embodiments of RRC state changes of a terminal in a communication network.

[0080] Referring to FIG. 7, a terminal may perform a signal monitoring operation in an RRC inactive state or an RRC idle state (S701). The terminal may periodically perform the signal monitoring operation. The signal monitoring operation may be a paging signal monitoring operation. The base station may transmit a paging signal to the terminal (e.g., a terminal in an RRC inactive state or an RRC idle state) (S702). The time at which the base station transmits the paging signal may be within the signal monitoring period of the terminal (e.g., an on period within the signal monitoring period). The terminal may receive the paging signal from the base station. Upon receiving the paging signal, the terminal may transmit an RRC connected request to the base station (S703). The signal monitoring operation of the terminal after receiving the paging signal may differ from the signal monitoring operation of the terminal before receiving the paging signal. To change the RRC state of the terminal, the terminal may transmit and receive signals with the base station. According to the above-described operations, the RRC state of the terminal may be changed to the RRC connected state. The terminal can operate in an RRC connected state (S704).

[0081] A terminal can monitor a paging signal in an RRC inactive state or an RRC idle state. The signal monitoring operation for paging can be performed in the same or similar manner as in the embodiment of FIG. 6. The base station can transmit paging configuration information to the terminal through signaling. The paging configuration information can be included in a system information block (SIB) transmitted by the base station. The terminal can receive the paging configuration information through signaling from the base station. The paging configuration information can include at least one of a monitoring period for monitoring paging, a time offset of the monitoring period, or the length of a signal monitoring interval for paging. Paging (e.g., a paging signal, a paging message) can be transmitted through DCI. The terminal can perform PDCCH monitoring (e.g., PO (paging occasion) monitoring) to receive paging.

[0082] A terminal may periodically perform monitoring operations to receive paging signals while in the RRC inactive or RRC idle state. The terminal may not receive signals during periods when paging is not monitored. The above-described operations may reduce the power consumption of the terminal. In a communication network (e.g., a communication system), monitoring operations for other signals that consume less power than paging monitoring may be considered to reduce the power consumption of the terminal.

[0083] In order to save power during signal monitoring operations of a terminal in a communication network, a low-power wake-up signal (LP-WUS) and / or a low-power wake-up receiver (LP-WUR) may be considered. The power required for monitoring the low-power wake-up signal in the terminal may be less than the power required for monitoring paging in the terminal. The terminal may include a low-power wake-up receiver. The low-power wake-up receiver may be used to receive the low-power wake-up signal. The power consumption of the low-power wake-up receiver may be less than the power consumption of a conventional receiver (e.g., a receiver that receives paging). The terminal may include a conventional receiver and / or a low-power wake-up receiver. The terminal may receive conventional signals (e.g., paging) using the conventional receiver and may receive the low-power wake-up signal using the low-power wake-up receiver. The conventional receiver may refer to a main radio. In the present disclosure, a low-power wake-up signal may be conveniently referred to as a low-power signal or a wake-up signal, and a low-power wake-up receiver may be conveniently referred to as a low-power receiver or a wake-up receiver.

[0084] A base station can transmit a low-power wakeup signal. A terminal can monitor the low-power wakeup signal. The terminal can utilize a low-power wakeup receiver to monitor the low-power wakeup signal. The low-power wakeup receiver can be configured separately from the terminal's existing receiver (e.g., a signal receiver, a main radio). In other words, the terminal can include a low-power wakeup receiver and an existing receiver.

[0085] Figure 8 is a block diagram illustrating embodiments of communication nodes that constitute a communication network.

[0086] Referring to FIG. 8, a terminal may include a main radio and a low-power wake-up receiver (e.g., a low-power receiver). The main radio may refer to an existing receiver of the terminal. For example, the main radio and the low-power wake-up receiver may be configured within the same hardware, and within the same hardware, the main radio and the low-power wake-up receiver may be software-separated. For another example, the main radio and the low-power wake-up receiver may be configured with different hardware. The terminal may receive a signal via an antenna. The received signal may be transmitted to the main radio and / or the low-power wake-up receiver. For another example, the antennas for the main radio and the antennas for the low-power wake-up receiver may be configured independently within the terminal. In other words, the terminal may include a first antenna for the main radio and a second antenna for the low-power wake-up receiver. When a low-power wake-up signal is detected, the low-power wake-up receiver may transmit detection information of the low-power wake-up signal to the main radio. The main radio can receive detection information of a low-power wakeup signal from a low-power wakeup receiver. The main radio can transmit information for the operation of the low-power wakeup receiver to the low-power wakeup receiver, and the low-power wakeup receiver can receive information for the operation from the main radio.

[0087] The low-power wake-up signal may be a signal modulated using the On Off Keying (OOK) method. The low-power wake-up signal may include encoded information. In other words, the low-power wake-up signal may be transmitted in the form of encoded information. One or more of a channel code, a cyclic redundancy check (CRC), or repeated transmission may be applied to the information bits of the low-power wake-up signal, and the low-power wake-up signal may be transmitted. The low-power wake-up signal may be transmitted in the form of a sequence. Depending on the information that the base station wishes to transmit, the low-power wake-up signal may be composed of different sequences. The sequence may be a binary sequence.

[0088] An OFDM sequence can be overlaid on a low-power wake-up signal using an OOK modulation scheme. For example, an OFDM sequence (e.g., an OFDM-modulated sequence) can be overlaid on ON symbol(s) among OOK symbols (e.g., an OOK signal), and the OOK signal with the OFDM sequence overlaid can be transmitted. A low-power wake-up receiver that is not capable of receiving an OFDM signal can interpret the signal as an OOK signal. A low-power wake-up receiver that is capable of receiving an OFDM signal can obtain an OFDM sequence from the signal.

[0089] The OFDM sequence for the low-power wake-up signal may or may not be overlaid, depending on the base station settings. The base station may transmit information to the terminal via signaling indicating whether the OFDM sequence for the low-power wake-up signal is overlaid. The terminal may receive this information from the base station and, based on this information, determine whether the OFDM sequence for the low-power wake-up signal is overlaid.

[0090] A base station can transmit information via an overlay of an OFDM sequence. For example, the base station can overlay one of one or more OFDM sequence candidates on an OOK symbol(s), and transmit information by transmitting the OOK symbol(s) on which one OFDM sequence candidate is overlaid. The above-described transmission (e.g., a transmission method) can be referred to as an overlay transmission (e.g., an overlay transmission method). The base station can perform the overlay transmission based on one of M OFDM sequence candidates. M can be a natural number. For example, M can be 4. A terminal can receive one OFDM sequence (e.g., one OFDM sequence candidate) from the base station among one or more OFDM sequence candidates, and can obtain information from the received one OFDM sequence.

[0091] For another example, a base station can transmit one of one or more OFDM sequence candidates based on an overlay transmission method. At this time, the base station can transmit information using the position of the OOK symbol on which the OFDM sequence is overlaid. A terminal can receive one OFDM sequence (e.g., one OFDM sequence candidate) transmitted by the base station among one or more OFDM sequence candidates, can identify the position of the OOK symbol on which the one OFDM sequence is overlaid, and can identify (e.g., obtain) information based on the identified position.

[0092] A terminal can confirm information transmitted via a low-power wake-up signal by receiving an OFDM sequence overlaid on an OOK symbol. The low-power wake-up signal can be generated based on an OFDM sequence. The terminal can receive the OFDM sequence overlaid on the OOK symbol and confirm the same information as the information transmitted via the low-power wake-up signal based on the OFDM sequence. In other words, the terminal can confirm the entire information transmitted via the low-power wake-up signal based on the received OFDM sequence. Alternatively, the terminal can receive the OFDM sequence overlaid on the OOK symbol and confirm a part of the information transmitted via the low-power wake-up signal based on the OFDM sequence.

[0093] A base station may transmit information about an OFDM sequence overlaid on an OOK symbol (hereinafter referred to as “OFDM sequence-related information”) to a terminal. The OFDM sequence-related information may include one or more of the following information.

[0094] - Length of OFDM sequence

[0095] - Root value used to generate OFDM sequence

[0096] - Cyclic shift value used to generate OFDM sequence

[0097] The base station may transmit to the terminal an upper layer message (e.g., RRC configuration, RRC message) including one or more of the above information. As another example, the base station may transmit to the terminal system information (e.g., MIB, SIB) including one or more of the above information. The terminal may receive one or more of the above information from the base station, and based on the received one or more pieces of information, may identify OFDM sequence-related information (e.g., information on an OFDM sequence overlaid on an OOK).

[0098] The subcarrier spacing of the low-power wake-up signal may be the same as the subcarrier spacing used by the base station to transmit signals other than the low-power wake-up signal. For example, the subcarrier spacing of the low-power wake-up signal may be the same as the subcarrier spacing of the BWP (e.g., the subcarrier spacing configured for the BWP). In another example, the subcarrier spacing of the low-power wake-up signal may be indicated by the base station. The base station may transmit subcarrier spacing information of the low-power wake-up signal to the terminal through a higher-layer message or a system information block. The terminal may receive the subcarrier spacing information of the low-power wake-up signal from the base station through a higher-layer message or a system information block. The terminal may receive the low-power wake-up signal based on the subcarrier spacing information. In the present disclosure, the system information block may refer to a MIB and / or a SIB.

[0099] For another example, a predefined value can be used as the subcarrier spacing of a low-power wake-up signal. The base station can transmit the low-power wake-up signal using the predefined subcarrier spacing. The terminal can receive the low-power wake-up signal using the predefined subcarrier spacing. For another example, if subcarrier spacing information of the low-power wake-up signal is received from the base station, the terminal can receive the low-power wake-up signal using the subcarrier spacing indicated by the base station. If the terminal does not receive subcarrier spacing information of the low-power wake-up signal from the base station, the terminal can receive the low-power wake-up signal using a predefined subcarrier spacing (e.g., a predefined value).

[0100] Monitoring for the reception of a low-power wake-up signal for a low-power wake-up receiver may be configured. The method for monitoring the low-power wake-up signal may be the same as or similar to the embodiment of FIG. 6. The monitoring operation for the low-power wake-up signal may be performed periodically. The monitoring period for the low-power wake-up signal may be configured periodically.

[0101] Synchronization (e.g., time synchronization) between the base station and the terminal may be required to receive a low-power wake-up signal from the terminal. The base station may transmit a low-power synchronization signal for the purpose of obtaining synchronization (e.g., time synchronization) of the terminal. The terminal may receive the low-power synchronization signal from the base station and obtain synchronization (e.g., time synchronization) based on the received low-power synchronization signal.

[0102] The low-power synchronization signal can be transmitted using the OOK modulation scheme. For example, the low-power synchronization signal can be transmitted using the OOK-M modulation scheme. For transmission of the low-power synchronization signal based on OOK-M, the value of M can be determined. M can be a natural number. For example, the value of M used for transmission of the low-power synchronization signal based on OOK-M can be the same as the value of M of OOK-M used for transmission of the low-power wake-up signal. For another example, the value of M used for transmission of the low-power synchronization signal based on OOK-M can be different from the value of M of OOK-M used for transmission of the low-power wake-up signal. The value of M used for transmission of the low-power synchronization signal based on OOK-M can be equal to or greater than (for example, exceeds) the value of M of OOK-M used for transmission of the low-power wake-up signal. Alternatively, the value of M used for transmission of a low-power synchronization signal based on OOK-M may be less than (e.g., less than) the value of M of OOK-M used for transmission of a low-power wake-up signal.

[0103] A base station may transmit information related to a low-power synchronization signal to a terminal. In the present disclosure, the information related to the low-power synchronization signal may be referred to as low-power synchronization information or low-power synchronization configuration information. The low-power synchronization information (e.g., low-power synchronization configuration information) may include at least one of a transmission period of the low-power synchronization signal, a time offset of transmission of the low-power synchronization signal, sequence information used to configure the low-power synchronization signal, multi-beam transmission information of the low-power synchronization signal, or frequency information of transmission of the low-power synchronization signal. In one embodiment, the base station may transmit the information using a system information block. For example, the base station may transmit the low-power synchronization information to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, DCI). The terminal may receive the low-power synchronization information from the base station. The terminal may receive a low-power synchronization signal from the base station using the low-power synchronization information.

[0104] A low-power synchronization signal can be transmitted periodically in the time domain. The base station can instruct (e.g., configure) the transmission period of the low-power synchronization signal to the terminal. The base station can instruct the transmission period of the low-power synchronization signal to the terminal through signaling (e.g., system information). The terminal can receive information about the transmission period of the low-power synchronization signal from the base station. Information about the transmission period of the low-power synchronization signal can be received through system information. The terminal can receive the low-power synchronization signal from the base station using the transmission period instructed by the base station. The terminal can perform periodic signal monitoring in the same manner as or similar to the embodiment of FIG. 6 to receive the low-power synchronization signal.

[0105] A low-power synchronization signal can be transmitted aperiodicly in the time domain. A base station can transmit an aperiodic low-power synchronization signal as needed. The base station can transmit information related to the transmission of the aperiodic low-power synchronization signal (e.g., low-power synchronization information, low-power synchronization configuration information) to a terminal. The low-power synchronization information can include information for periodic transmission of the low-power synchronization signal and / or information for aperiodic transmission of the low-power synchronization signal. The low-power synchronization information can include at least one of resource information of the aperiodic low-power synchronization signal (e.g., time resource information and / or frequency resource information), sequence information used to configure the aperiodic low-power synchronization signal, or beam information used to transmit the aperiodic low-power synchronization signal. A terminal can receive the low-power synchronization information (e.g., information related to the transmission of the aperiodic low-power synchronization signal). Based on the received low-power synchronization information, the terminal can receive an aperiodic low-power synchronization signal from the base station.

[0106] Aperiodic low-power synchronization signals can be transmitted using the same sequence as periodic low-power synchronization signals. Aperiodic low-power synchronization signals can be transmitted using the same frequency resources as periodic low-power synchronization signals.

[0107] An aperiodic low-power synchronization signal can be transmitted using a different time resource than a periodic low-power synchronization signal. The transmission time interval of the aperiodic low-power synchronization signal may not overlap with the transmission time interval of the periodic low-power synchronization signal. The transmission time interval of the aperiodic low-power synchronization signal can be indicated to a terminal by a time offset from the transmission time interval of the periodic low-power synchronization signal. The terminal can receive information on the transmission time interval of the periodic low-power synchronization signal from the base station. The terminal can receive information on the time offset for the transmission time interval of the aperiodic low-power synchronization signal from the base station. The terminal can identify the transmission time interval of the aperiodic low-power synchronization signal using the information on the transmission time interval of the periodic low-power synchronization signal and the time offset information for the transmission time interval of the aperiodic low-power synchronization signal. The terminal can receive an aperiodic low-power synchronization signal from the base station in the identified transmission time interval.

[0108] The transmission period of the low-power synchronization signal may be set to be the same as the transmission period of the SSB (synchronization signal block) of the base station. If the transmission period of the low-power synchronization signal is the same as the transmission period of the SSB, the base station may not separately instruct the terminal regarding information regarding the transmission period of the low-power synchronization signal. If the terminal does not receive information regarding the transmission period of the low-power synchronization signal from the base station (e.g., if the transmission period of the low-power synchronization signal is not instructed or set to the terminal), the terminal may determine (e.g., understand, estimate, or consider) that the transmission period of the low-power synchronization signal is the same as the SSB transmission period.

[0109] When the transmission period of the low-power synchronization signal is the same as the SSB transmission period, the low-power synchronization signal can be transmitted multiplexed with the SSB. The low-power synchronization signal can be transmitted multiplexed with the SSB in the time domain. The low-power synchronization signal can be multiplexed in the front section of the SSB in the time domain. For example, the multiplexing operation for the low-power synchronization signal and the SSB can be performed such that the last symbol of the low-power synchronization signal is located in front of the start symbol of the SSB. In the present disclosure, the symbol may mean an OFDM symbol. Alternatively, the low-power synchronization signal can be multiplexed in the rear section of the SSB in the time domain. For example, the multiplexing operation for the low-power synchronization signal and the SSB can be performed such that the start symbol of the low-power synchronization signal is located after the last symbol of the SSB.

[0110] A low-power synchronization signal can be transmitted multiplexed with an SSB in the frequency domain. The low-power synchronization signal can be multiplexed in a frequency region lower than the SSB in the frequency domain. For example, the multiplexing operation for the low-power synchronization signal and the SSB can be performed such that the last subcarrier of the low-power synchronization signal has a lower subcarrier index than the start subcarrier of the SSB. Alternatively, the low-power synchronization signal can be multiplexed in a frequency region higher than the SSB in the frequency domain. For example, the multiplexing operation for the low-power synchronization signal and the SSB can be performed such that the start subcarrier of the low-power synchronization signal has a higher subcarrier index than the end subcarrier of the SSB.

[0111] The transmission location of the low-power synchronization signal can be indicated (e.g., configured) to the terminal. The base station can transmit the transmission location information of the low-power synchronization signal to the terminal via signaling (e.g., system information, RRC message, MAC CE, and / or DCI). The terminal can receive the transmission location information of the low-power synchronization signal via signaling from the base station. The terminal can identify the transmission location of the low-power synchronization signal based on the signaling message from the base station.

[0112] In the time domain, the position (e.g., the starting position) of a low-power synchronization signal can be indicated by a time offset from a reference time (e.g., a reference time point). The time offset can be set in units of symbols, slots, subframes, or frames. The reference time for the low-power synchronization signal can be the transmission position of an SSB. For example, the reference time for the low-power synchronization signal can be the starting symbol or the last symbol of an SSB. Alternatively, the reference time for the low-power synchronization signal can be a reference frame. The position of the low-power synchronization signal can be indicated by a time offset from the reference frame. The reference frame can be the same as the reference frame indicating the paging occasion. Alternatively, the reference time for the low-power synchronization signal can be the transmission position of a low-power wake-up signal. The position of the low-power synchronization signal can be indicated by a time offset from the transmission position (e.g., the starting position) of the low-power wake-up signal.

[0113] The position of the low-power synchronization signal in the frequency domain can be indicated by a frequency offset from a reference point. The frequency offset can be set in units of PRB or subcarrier. The reference point for the low-power synchronization signal can be point A according to system configuration. The position of the low-power synchronization signal in the frequency domain can be indicated by a frequency offset from point A. For another example, the reference point for the low-power synchronization signal can be a transmission position of an SSB (e.g., a start subcarrier or an end subcarrier). The position of the low-power synchronization signal in the frequency domain can be indicated by a frequency offset from a transmission position of an SSB (e.g., a start subcarrier or an end subcarrier). For another example, the reference point for the low-power synchronization signal can be CORESET #0. The position of the low-power synchronization signal in the frequency domain can be indicated by a frequency offset from a position of CORESET #0 (e.g., a lowest frequency resource or a highest frequency resource of CORESET #0).

[0114] A low-power synchronization signal may include a sequence, and the sequence may vary based on base station configuration. The base station may transmit different sequences via low-power synchronization signals depending on the configuration. For example, the low-power synchronization signals may include different sequences. For example, the sequence of the low-power synchronization signal may vary based on the cell ID of the base station. The number of sequences used for the low-power synchronization signal may vary based on the base station configuration. The sequence for the low-power synchronization signal may be determined based on the cell ID of the base station and the number of candidate sequences available for the low-power synchronization signal.

[0115] The base station can indicate sequence configuration information of a low-power synchronization signal to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The RRC configuration may refer to an RRC message. The sequence configuration information of the low-power synchronization signal may include the number of candidate sequences of the low-power synchronization signal. The number of candidate sequences may refer to the number of different sequences transmitted as the low-power synchronization signal. The terminal can detect the low-power synchronization signal using the sequence configuration information of the low-power synchronization signal.

[0116] If the sequence setting information of the low-power synchronization signal is not transmitted to the terminal, the base station can generate a sequence using a default value and transmit a low-power synchronization signal including the sequence to the terminal. If the terminal does not receive the sequence setting information of the low-power synchronization signal from the base station, the terminal can assume that the sequence of the low-power synchronization signal is generated using the default value. The terminal can perform a reception operation of the low-power synchronization signal based on the assumption. The default value can mean the number of sequences. For example, the default value can mean that the number of sequences is 1. As another example, the default value can mean that the number of sequences is 3. Alternatively, the default value can be a value defined based on the cell ID of the base station and a predefined mathematical formula. In other words, the sequence of the low-power synchronization signal can be defined based on the cell ID of the base station and a predefined mathematical formula, and the sequence can be a default value (e.g., a default sequence).

[0117] A low-power synchronization signal can be generated based on an OOK modulation scheme, and a sequence can be overlaid on the low-power synchronization signal (e.g., OOK symbol(s)). The sequence can mean an OFDM sequence (e.g., a sequence modulated by an OFDM scheme). The sequence can be overlaid on ON symbol(s) among OOK symbols, and the OOK symbols on which the sequence is overlaid (e.g., an OOK signal, a low-power synchronization signal) can be transmitted. A low-power wake-up receiver that is incapable of receiving an OFDM signal can interpret the OFDM signal (e.g., a low-power synchronization signal on which an OFDM sequence is overlaid) as an OOK signal (e.g., an OOK modulated signal). A low-power wake-up receiver capable of receiving an OFDM signal can obtain an OFDM sequence from the OFDM signal (e.g., a low-power synchronization signal on which an OFDM sequence is overlaid).

[0118] Depending on the base station's settings, an OFDM sequence may or may not be overlaid on a low-power synchronization signal. The base station can transmit information to the terminal via signaling indicating whether to overlay the OFDM sequence on the low-power synchronization signal. The terminal can receive this information via signaling from the base station and, based on this information, determine whether to overlay the OFDM sequence on the low-power synchronization signal.

[0119] A low-power synchronization signal can be transmitted using the same beam as an SSB. The terminal can assume that the low-power synchronization signal and the SSB are quasi-co-located (QCL). One low-power synchronization signal can have a QCL relationship with one SSB. The base station can transmit QCL information of the low-power synchronization signal to the terminal through signaling. The terminal can receive the QCL information of the low-power synchronization signal through signaling from the base station. The QCL information of the low-power synchronization signal can be information about the QCL relationship between the low-power synchronization signal and the SSB. For example, the QCL information of the low-power synchronization signal can be information indicating that the QCL relationship between the low-power synchronization signal and the SSB is QCL type D. For another example, the QCL information of the low-power synchronization signal can be information indicating that the QCL relationship between the low-power synchronization signal and the SSB is QCL type A or QCL type C. The terminal can receive the low-power synchronization signal using the QCL information of the low-power synchronization signal.

[0120] A terminal in an RRC idle or RRC inactive state can receive a low-power synchronization signal. A terminal in an RRC connected state may not receive a low-power synchronization signal. Alternatively, a terminal in an RRC connected state can receive a low-power synchronization signal.

[0121] FIG. 9 is a flowchart illustrating embodiments of a method for receiving a low-power synchronization signal in a communication network.

[0122] Referring to FIG. 9, a base station can transmit configuration information of a low-power synchronization signal (e.g., low-power synchronization configuration information) to a terminal via signaling (S901). The terminal can receive the configuration information of the low-power synchronization signal via signaling from the base station (S901). The terminal can configure monitoring (e.g., monitoring operation) of the low-power synchronization signal based on the configuration information received from the base station (S902). The base station can transmit the low-power synchronization signal to the terminal (S903). The low-power synchronization signal can be transmitted based on the configuration information. The terminal can receive the low-power synchronization signal from the base station based on the monitoring configuration (S904). The terminal can obtain synchronization with the base station based on the low-power synchronization signal.

[0123] Methods for transmitting a low-power synchronization signal using multiple beams will be described. A base station can transmit a low-power synchronization signal using multiple beams. Multi-beam transmission may mean that the same signal is transmitted using different transmission beams. The base station can repeatedly transmit the same low-power synchronization signal in the time domain. Repeated transmissions of the same low-power synchronization signal may be performed using different transmission beams. The base station can repeatedly transmit the same low-power synchronization signal N times in consecutive sections of the time domain, where N may be a natural number. The base station can repeatedly transmit the low-power synchronization signal N times using N different transmission beams. The base station can transmit information indicating whether the low-power synchronization signal is transmitted using multiple beams to a terminal. The terminal can receive the information from the base station and, based on the information, determine whether the low-power synchronization signal is transmitted using multiple beams. The base station can indicate to the terminal, through signaling, information about the number of multiple beams used for transmitting the low-power synchronization signal. The terminal can determine the number of multiple beams used to transmit the low-power synchronization signal through signaling from the base station. Using this information, the terminal can receive the low-power synchronization signal.

[0124] Information transmitted via a low-power synchronization signal will be described. In other words, information included in a low-power synchronization signal will be described. The low-power synchronization signal may include time information. The time information may include information indicating a time at which the low-power synchronization signal is transmitted. The time information may include at least one of a frame number, a subframe number, a slot number, or a symbol index at which the low-power synchronization signal is transmitted. The number may mean an index. The low-power synchronization signal may include cell information. The cell information may mean information on a cell to which the low-power synchronization signal is transmitted. The cell information may include a cell ID. The cell ID indicated by the low-power synchronization signal may mean all or part of a cell ID in a communication network.

[0125] Information transmitted via a low-power synchronization signal may be included in the payload of the low-power synchronization signal. The terminal may obtain (e.g., verify) the information by decoding the payload included in the low-power synchronization signal. The information transmitted via the low-power synchronization signal may be scrambled into a sequence included in the low-power synchronization signal. In this case, the terminal may obtain (e.g., verify) the information by analyzing the correlation of the sequence included in the low-power synchronization signal.

[0126] The base station can transmit the transmission power information of the low-power synchronization signal to the terminal through signaling (e.g., system information, RRC message, MAC CE, and / or DCI). The transmission power of the low-power synchronization signal can be indicated as an offset with respect to the transmission power of the SSB. In this case, the terminal can determine the transmission power of the low-power synchronization signal based on the transmission power of the SSB (or reference signal) and the offset indicated by the base station. The transmission power of the low-power synchronization signal can be indicated in the form of an average EPRE (Energy Per Resource Element). For example, the transmission power of the low-power synchronization signal can be defined as the average EPRE, and the transmission power of the low-power synchronization signal can be indicated as an offset based on the average EPRE of the SSB (or reference signal). In this case, the terminal can determine the transmission power of the low-power synchronization signal based on the average EPRE of the SSB (or reference signal) and the offset indicated by the base station. In other words, the terminal can check the transmission power of the low-power synchronization signal using the above-described information.

[0127] The base station can transmit transmission power information of a low-power wake-up signal to the terminal through signaling (e.g., system information, RRC message, MAC CE, and / or DCI). The transmission power of the low-power wake-up signal can be indicated as an offset with respect to the transmission power of the SSB. In this case, the terminal can determine the transmission power of the low-power wake-up signal based on the transmission power of the SSB (or reference signal) and the offset indicated by the base station. The transmission power of the low-power wake-up signal can be indicated in the form of an average EPRE. For example, the transmission power of the low-power wake-up signal can be defined as the average EPRE, and the transmission power of the low-power wake-up signal can be indicated as an offset based on the average EPRE of the SSB (or reference signal). In this case, the terminal can determine the transmission power of the low-power wake-up signal based on the average EPRE of the SSB (or reference signal) and the offset indicated by the base station. In other words, the terminal can check the transmission power of the low-power wake-up signal using the above-described information. A method for measuring RRM (radio resource management) of the terminal will be described. In a communication network, the terminal can measure the quality of a signal transmitted by a base station. In other words, the terminal can perform RRM measurement. The measurement result can be utilized for cell determination (e.g., cell selection, cell reselection). A terminal supporting 5G, etc. can perform RRM measurement on a signal received from a base station. In the RRM measurement procedure, the terminal can measure at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Noise Ratio (SINR), or Received Signal Strength Indicator (RSSI). The terminal can transmit the RRM measurement result to the base station.In the present disclosure, the RRM measurement operation of a terminal may include an operation in which the terminal transmits an RRM measurement result to a base station. The RRM measurement operation may be referred to as a measurement operation.

[0128] As in the embodiment of FIG. 8, the terminal may include a low-power wake-up receiver and a main radio, and the terminal may perform RRM measurements. The terminal may perform RRM measurements using the low-power wake-up receiver. The terminal may perform RRM measurements on a low-power wake-up signal received from a base station. The terminal may perform RRM measurements on a low-power synchronization signal received from the base station. The terminal may use the low-power synchronization signal for RRM measurements in addition to time synchronization acquisition. The terminal may perform RRM measurements on a serving cell based on the low-power synchronization signal received from the base station. The terminal may perform RRM measurements on an adjacent cell based on the low-power synchronization signal received from the base station.

[0129] The terminal can measure at least one of RSRP, RSSI, RSRQ, or SINR for a signal received from a base station (e.g., a low-power synchronization signal, a low-power wake-up signal, an SSB, a reference signal (e.g., DM-RS, CSI-RS, PT-RS), and / or a legacy NR signal). In the present disclosure, a signal usable for RRM (e.g., RRM measurement) in a terminal including a low-power wake-up receiver may be referred to as a low-power RRM signal. A signal used for RRM measurement other than a low-power RRM signal (e.g., a legacy signal, an NR signal) may be referred to as a legacy RRM signal. A legacy RRM signal may mean a legacy measurement signal, and a low-power RRM signal may mean a low-power measurement signal. A legacy RRM signal may include at least one of a synchronization signal (e.g., SSB) or a reference signal. A legacy RRM signal may be received by a main radio of the terminal.

[0130] A low-power RRM signal may include a low-power synchronization signal, a low-power wake-up signal, etc. A low-power wake-up receiver may receive the low-power RRM signal and measure an RSRP for the low-power RRM signal. The RSRP for the low-power RRM signal may be referred to as LP (low-power)-RSRP. The LP-RSRP may be defined as the average received power during an ON period among the OOK symbols of the low-power RRM signal. The low-power wake-up receiver may receive the low-power RRM signal and measure an RSSI for the low-power RRM signal. The RSSI for the low-power RRM signal may be referred to as LP-RSSI. The LP-RSSI may be defined as the average received power during a reception period of the low-power RRM signal. Alternatively, the LP-RSSI may be defined as the average received power during an OFF period among the OOK symbols of the low-power RRM signal. LP-RSRQ can be defined as LP-RSRP divided by LP-RSSI.

[0131] Methods for RRM measurement using low-power RRM signals will be described. RRM measurement using low-power RRM signals may refer to RRM measurement using a low-power wake-up receiver. A terminal can perform RRM measurement using low-power RRM signals when its environment in a communication network satisfies certain conditions.

[0132] When the result of the RRM measurement using the main radio satisfies a specific condition, the terminal can perform RRM measurement using a low-power RRM signal. When the result of the RRM measurement using the main radio is equal to or greater than a threshold, the terminal can perform RRM measurement using a low-power RRM signal. The result of the RRM measurement using the main radio can be at least one of RSRP, RSRQ, SINR, or RSSI. When the RSRP measured using the main radio is equal to or greater than threshold 1 and the RSRQ measured using the main radio is equal to or greater than threshold 2, the terminal can perform RRM measurement using a low-power RRM signal. Threshold 1 and / or threshold 2 may be set to be identical to a threshold used for cell determination (e.g., cell selection, cell reselection) of the terminal. Alternatively, threshold 1 and / or threshold 2 may be indicated (e.g., set) by an offset from a threshold used for cell determination of the terminal. Alternatively, threshold 1 and / or threshold 2 may be instructed (e.g., set) from the base station to the terminal.

[0133] When a result of an RRM measurement using a low-power wake-up receiver satisfies a specific condition, the terminal may perform RRM measurement using a low-power RRM signal. When a result of an RRM measurement using the low-power wake-up receiver is equal to or greater than a threshold, the terminal may perform RRM measurement using a low-power RRM signal. The result of an RRM measurement using the low-power wake-up receiver may be at least one of RSRP, RSRQ, SINR, or RSSI. When the RSRP measured using the low-power wake-up receiver is equal to or greater than threshold 1 and the RSRQ measured using the low-power wake-up receiver is equal to or greater than threshold 2, the terminal may perform RRM measurement using a low-power RRM signal. Threshold 1 and / or threshold 2 may be set to be identical to a threshold used for cell determination (e.g., cell selection, cell reselection) of the terminal. Alternatively, threshold 1 and / or threshold 2 may be indicated (e.g., set) by an offset from a threshold used for cell determination of the terminal. Alternatively, threshold 1 and / or threshold 2 may be instructed (e.g., set) from the base station to the terminal.

[0134] When the RRM measurement result using the main radio and the RRM measurement result using the low-power wake-up receiver satisfy specific conditions, the terminal can perform RRM measurement using a low-power RRM signal. When the RRM measurement result using the main radio and the RRM measurement result using the low-power wake-up receiver are equal to or greater than a threshold, the terminal can perform RRM measurement using a low-power RRM signal. Each of the RRM measurement result using the main radio and the RRM measurement result using the low-power wake-up receiver can be at least one of RSRP, RSRQ, SINR, or RSSI. When the RRM measurement result using the main radio is equal to or greater than threshold 1 and the RRM measurement result using the low-power wake-up receiver is equal to or greater than threshold 2, the terminal can perform RRM measurement using a low-power RRM signal.

[0135] The base station can transmit information about threshold 1 and / or threshold 2 to the terminal through signaling. The terminal can receive information about threshold 1 and / or threshold 2 through signaling from the base station. "If the base station instructs (e.g., sets) the terminal a threshold for the RRM measurement result using the main radio, and the RRM measurement result using the main radio is equal to or greater than the threshold," the terminal can perform RRM measurement using a low-power RRM signal. At this time, the RRM measurement using the main radio can be stopped. Alternatively, a relaxed RRM measurement using the main radio can be performed. "If the base station instructs (e.g., sets) the terminal a threshold for the RRM measurement result using the low-power wake-up receiver, and the RRM measurement result using the low-power wake-up receiver is equal to or greater than the threshold," the terminal can perform RRM measurement using a low-power RRM signal. In other words, the RRM measurement using the low-power RRM signal can be continuously performed. "If the base station instructs (e.g., sets) the terminal to set threshold 1 for the RRM measurement result using the main radio and threshold 2 for the RRM measurement result using the low-power wake-up receiver, and the RRM measurement result using the main radio is equal to or greater than the threshold 1 and the RRM measurement result using the low-power wake-up receiver is equal to or greater than the threshold 2," the terminal can perform RRM measurement using a low-power RRM signal.

[0136] The RRM measurement results using the terminal's main radio may be measurements for the serving cell and / or neighboring cells. The RRM measurement results using the terminal's low-power wake-up receiver may be measurements for the serving cell and / or neighboring cells.

[0137] When the result of RRM measurement using the main radio or the low-power wake-up receiver is greater than or equal to a threshold, the terminal can perform RRM measurement using a low-power RRM signal. The base station can indicate information about the threshold to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information about the threshold from the base station and determine whether to perform RRM measurement using the low-power RRM signal based on the threshold. If the terminal does not receive information about the threshold from the base station (e.g., if the threshold is not indicated or set to the terminal), the terminal can use a default value for the threshold as the threshold. The default value for the threshold may be a value predefined in the communication system. Alternatively, the default value for the threshold may be a value defined according to the implementation of the terminal.

[0138] The threshold may be set differently depending on the type of low-power wake-up receiver. The threshold may be set differently depending on whether the low-power wake-up receiver receives OFDM signals. The threshold for an OFDM-based low-power wake-up receiver capable of receiving OFDM signals may be set differently from the threshold for an OOK-based low-power wake-up receiver that cannot receive OFDM signals. An OOK-based low-power wake-up receiver that cannot receive OFDM signals can receive OOK signals.

[0139] The threshold can be set individually. The terminal can apply the threshold received from the base station according to the type of the terminal (e.g., the low-power wake-up receiver included in the terminal). The base station can set a threshold for an OFDM-based low-power wake-up receiver and a threshold for an OOK-based low-power wake-up receiver in the terminal. When the type of the terminal (e.g., the low-power wake-up receiver included in the terminal) is an OFDM-based low-power wake-up receiver, the terminal can perform RRM measurement (e.g., RRM measurement switching, RRM measurement relaxation) using the threshold for the OFDM-based low-power wake-up receiver. When the type of the terminal (e.g., the low-power wake-up receiver included in the terminal) is an OOK-based low-power wake-up receiver, the terminal can perform RRM measurement (e.g., RRM measurement switching, RRM measurement relaxation) using the threshold for the OOK-based low-power wake-up receiver.

[0140] If the RRM measurement result of the main radio or low-power wake-up receiver is greater than or equal to the threshold, the terminal may transmit (e.g., indicate) relevant information to the base station. The relevant information may be the RRM measurement result. Alternatively, the relevant information may be information indicating that the RRM measurement result is greater than or equal to the threshold.

[0141] If the comparison result of the threshold (e.g., the comparison result of the RRM measurement result and the threshold) satisfies the condition, the terminal can perform RRM measurement using a low-power RRM signal. The terminal can transmit information indicating whether the terminal measures RRM using the low-power RRM signal to the base station. The base station can determine whether the terminal performs an RRM measurement operation using the low-power RRM signal based on the information received from the terminal.

[0142] If the result of comparing the thresholds (e.g., the result of comparing the RRM measurement result and the threshold) satisfies the condition, the terminal may transmit related information to the base station. The related information may be the result of comparing the thresholds. The base station may receive the related information from the terminal and, based on the related information, determine (e.g., judge) whether the terminal performs RRM measurement using a low-power RRM signal. The base station may transmit to the terminal information indicating that the terminal performs RRM measurement using the low-power RRM signal or information indicating that the terminal does not perform RRM measurement using the low-power RRM signal. If information indicating that the terminal performs RRM measurement using the low-power RRM signal is received from the base station, the terminal may perform RRM measurement using the low-power RRM signal.

[0143] FIG. 10 is a flowchart illustrating embodiments of a method for measuring RRM using a low-power RRM signal (e.g., a low-power synchronization signal) in a communication network.

[0144] Referring to FIG. 10, a base station may transmit RRM measurement configuration information (S1001). A terminal may receive RRM measurement configuration information from the base station (S1001). The RRM measurement configuration information may be referred to as measurement configuration information. The base station may transmit an RRM measurement signal of the main radio of the terminal (S1002). The RRM measurement signal may be transmitted based on the RRM measurement configuration information. In S1003, the terminal may receive the RRM measurement signal from the base station through the main radio and perform RRM measurement on the RRM measurement signal. The reception operation of the RRM measurement signal may be performed based on the RRM measurement configuration information. The terminal may determine whether to perform an RRM measurement operation using a low-power wake-up receiver based on a comparison result between the RRM measurement result for the RRM measurement signal and a threshold (S1004). For example, the terminal may compare the RRM measurement result for the RRM measurement signal with a threshold included in the RRM measurement configuration information. If the comparison result satisfies the condition, the terminal may decide to perform RRM measurement using a low-power wake-up receiver. If the comparison result does not satisfies the condition, the terminal may decide not to perform RRM measurement using a low-power wake-up receiver.

[0145] If it is determined that an RRM measurement operation using a low-power wake-up receiver is to be performed, the terminal may transmit information indicating that the RRM measurement operation using the low-power wake-up receiver is to be performed to the base station. The base station may determine that the terminal is to perform the RRM measurement operation using the low-power wake-up receiver based on the information received from the terminal. Alternatively, the operation of the terminal transmitting information indicating that the RRM measurement operation using the low-power wake-up receiver is to be performed to the base station may be omitted.

[0146] The base station can transmit an RRM measurement signal (e.g., a low-power RRM signal, a low-power measurement signal) for a low-power wake-up receiver to the terminal (S1005). In S1006, the terminal can receive the low-power RRM signal from the base station through the low-power wake-up receiver and perform RRM measurement on the low-power RRM signal. The reception operation of the low-power RRM signal can be performed based on RRM measurement configuration information. When the RRM measurement operation for the low-power RRM signal is performed, the RRM measurement operation using the main radio can be stopped. In other words, the RRM measurement operation can be switched from the RRM measurement operation using the main radio to the RRM measurement operation using the low-power wake-up receiver. Alternatively, when the RRM measurement operation for the low-power RRM signal is performed, a relaxed RRM measurement operation using the main radio can be performed. The cycle of the relaxed RRM measurement operation can be longer than the cycle of the RRM measurement operation (e.g., the existing RRM measurement operation).

[0147] In a communication network (e.g., a communication system), when the environment of a terminal satisfies a specific condition, the terminal can perform RRM measurement using the main radio. When the result of RRM measurement using a low-power RRM signal satisfies a specific condition, the terminal can perform RRM measurement using the main radio. When the result of RRM measurement using a low-power wake-up receiver satisfies a specific condition, the terminal can perform RRM measurement using the main radio. Based on the RRM measurement result, the RRM measurement operation using the main radio and the RRM measurement operation using the low-power wake-up receiver can be switched.

[0148] If the RRM measurement result using the low-power RRM signal is below a threshold, the terminal can perform RRM measurement using the main radio. In other words, if the RRM measurement result using the low-power wake-up receiver is below a threshold, the terminal can perform RRM measurement using the main radio. In the above-described situation, the RRM measurement operation using the low-power wake-up receiver can be stopped, and the RRM measurement operation can be switched from the RRM measurement operation using the low-power wake-up receiver to the RRM measurement operation using the main radio.

[0149] The RRM measurement result using the low-power synchronization signal can be at least one of RSRP, RSRQ, SINR, or RSSI. "If the RSRP measured based on the low-power synchronization signal is less than or equal to threshold 1 and the RSRQ measured based on the low-power synchronization signal is less than or equal to threshold 2," the terminal can perform RRM measurement using the main radio. Threshold 1 and / or threshold 2 can be set to be the same as the threshold used for cell determination (e.g., cell selection, cell reselection) of the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., set) by an offset from the threshold used for cell determination of the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., set) to the terminal from the base station. The RRM measurement result using the low-power RRM signal can be a measurement result for a serving cell and / or a neighboring cell.

[0150] If the RRM measurement result using the low-power synchronization signal is below the threshold, the terminal can perform RRM measurement using the main radio. In other words, if the RRM measurement result using the low-power wake-up receiver is below the threshold, the terminal can perform RRM measurement using the main radio. At this time, the RRM measurement using the low-power wake-up receiver may be stopped. The base station can transmit information about the threshold to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information about the threshold from the base station and determine whether to perform the RRM measurement operation using the main radio based on the threshold. If the terminal does not receive information about the threshold from the base station (e.g., if the threshold is not indicated or set to the terminal), the terminal can use a default value for the threshold as the threshold. The default value for the threshold may be a value predefined in the communication system. Alternatively, the default value for the threshold may be a value defined according to the implementation of the terminal.

[0151] If the RRM measurement result using a low-power RRM signal is below a threshold, the terminal may transmit relevant information to the base station. The base station may receive the relevant information from the terminal. The relevant information may be the RRM measurement result and / or information indicating that the RRM measurement result is below a threshold.

[0152] If the comparison result between the RRM measurement result using the low-power RRM signal and the threshold satisfies the conditions, the terminal can perform RRM measurement using the main radio. The terminal can transmit information indicating whether the terminal is performing RRM measurement using the main radio to the base station. The base station can determine whether the terminal is performing RRM measurement using the main radio based on the information received from the terminal.

[0153] If the result of comparing the thresholds (e.g., the result of comparing the RRM measurement result with the threshold) satisfies the condition, the terminal may transmit related information to the base station. The related information may be the result of comparing the thresholds. The base station may receive the related information from the terminal and, based on the related information, determine (e.g., judge) whether the terminal performs RRM measurement using the main radio. The base station may transmit to the terminal information indicating that the terminal performs RRM measurement using the main radio or information indicating that the terminal does not perform RRM measurement using the main radio. If information indicating that the terminal performs RRM measurement using the main radio is received from the base station, the terminal may perform RRM measurement using the main radio. If information indicating that the terminal performs RRM measurement using a low-power wake-up receiver is not received from the base station or if information indicating that the terminal does not perform RRM measurement using a low-power wake-up receiver is received from the base station, the terminal may perform RRM measurement using the main radio.

[0154] If a terminal does not receive a low-power RRM signal for a certain period of time (hereinafter, referred to as a "critical period") while performing RRM measurement using a low-power RRM signal, the terminal may perform RRM measurement using the main radio. The base station may transmit information about the critical period to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal may receive information about the critical period from the base station. If the terminal does not receive information about the critical period from the base station (e.g., if the critical period is not indicated or set to the terminal), the terminal may use a default value for the critical period as the critical period. The default value for the critical period may be a value predefined in the communication system. Alternatively, the default value for the critical period may be a value defined according to the implementation of the terminal. If the terminal does not receive a low-power RRM signal (e.g., a low-power synchronization signal) for a period of time corresponding to the critical period indicated by the base station, the terminal may perform RRM measurement using the main radio.

[0155] A terminal can perform RRM measurements based on the signals it monitors. In other words, the receiver (e.g., a main radio or a low-power wake-up receiver) used by the terminal for RRM measurements can be determined based on the signals it monitors. A terminal performing PDCCH monitoring can perform RRM measurements using the main radio. In other words, the terminal can perform RRM measurements using the main radio during the time period in which it performs PDCCH monitoring.

[0156] If the terminal does not perform monitoring of a low-power wake-up signal while performing PO (paging occasion) monitoring or PEI (paging early indicator) monitoring, the terminal can perform RRM measurement using the main radio.

[0157] The terminal can perform RRM measurement using a low-power RRM signal during a time period in which it monitors a low-power wake-up signal. In other words, if the current operating state of the terminal is a state in which the low-power wake-up signal is monitored, the terminal can perform RRM measurement using a low-power RRM signal. "If the terminal stops performing PO monitoring or PEI monitoring and performs monitoring of a low-power wake-up signal," the terminal can perform RRM measurement using a low-power RRM signal.

[0158] A method for switching RRM measurements on a terminal will be described. If a condition is met while performing RRM measurements using the main radio, the terminal can perform RRM measurements using a low-power wake-up receiver. When performing RRM measurements using the low-power wake-up receiver, the terminal can stop RRM measurements using the main radio. In other words, when RRM measurements using the low-power wake-up receiver are initiated, the terminal can stop RRM measurements using the main radio. RRM measurements using the main radio can be stopped in both the serving cell and the neighboring cell. Alternatively, RRM measurements using the main radio in the serving cell can be stopped, while RRM measurements using the main radio in the neighboring cell may not be stopped. The terminal can replace the RRM measurement operation using the main radio with the RRM measurement operation using the low-power wake-up receiver. A switching operation between RRM measurements using the main radio and RRM measurements using the low-power wake-up receiver can be performed. The terminal can report the results of the RRM measurements using the low-power wake-up receiver to the base station. The base station can receive RRM measurement results from the terminal.

[0159] If the condition for RRM measurement switching is satisfied for a certain period of time or longer (for example, if the time for satisfying the condition for RRM measurement switching is longer than a certain period of time), the terminal may perform the RRM measurement switching. If the time for which the condition for RRM measurement switching is satisfied is less than (or equal to) the certain period of time, the terminal may not perform the RRM measurement switching. If the condition for RRM measurement switching is continuously satisfied for a certain period of time or longer, the terminal may perform the RRM measurement switching. If the condition for RRM measurement switching is not continuously satisfied, the time for which the condition for RRM measurement switching is satisfied may be initialized. The time for which the condition for RRM measurement switching is satisfied may be referred to as the condition satisfaction time. If the condition satisfaction time of the terminal is longer than (or exceeds) the condition threshold time, the terminal may perform the RRM measurement switching. If the condition satisfaction time of the terminal is less than (or equal to) the condition threshold time, the terminal may not perform the RRM measurement switching. The base station may transmit the configuration information for the RRM measurement switching to the terminal through signaling. The terminal may receive configuration information for RRM measurement switching from the base station. The configuration information for RRM measurement switching may include conditions and / or condition threshold times for RRM measurement switching. The conditions for RRM measurement switching may be a comparison result between an RRM measurement result and a threshold. The RRM measurement result may be at least one of RSRP, RSRQ, RSSI, or SINR.

[0160] The base station can transmit information about the threshold used for switching RRM measurements to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information about the threshold used for switching RRM measurements through signaling from the base station. Information about the threshold used for switching RRM measurements can be included in configuration information for switching RRM measurements (e.g., measurement configuration information). The threshold used for switching RRM measurements can be indicated (e.g., configured) based on an offset with respect to a threshold used for existing RRM measurements. The threshold used for existing RRM measurements can be a threshold used for RRM measurements for cell selection.

[0161] The threshold may be one or more values. For example, threshold 1 for the RRM measurement result via the main radio and / or threshold 2 for the RRM measurement result via the low-power wake-up receiver may be instructed (e.g., set) to the terminal. When the terminal receives threshold 1 for the RRM measurement result via the main radio from the base station, the terminal may determine whether to switch the RRM measurement using the comparison result between the RRM measurement result via the main radio and threshold 1. When the terminal receives threshold 2 for the RRM measurement result via the low-power wake-up receiver from the base station, the terminal may determine whether to switch the RRM measurement using the comparison result between the RRM measurement result via the low-power wake-up receiver and threshold 2.

[0162] When the terminal receives threshold 1 for the RRM measurement result via the main radio and threshold 2 for the RRM measurement result via the low-power wake-up receiver from the base station, the terminal can determine whether to switch the RRM measurement using the comparison result between the RRM measurement result via the main radio and threshold 1 and the comparison result between the RRM measurement result via the low-power wake-up receiver and threshold 2. For example, when both the comparison result between the RRM measurement result via the main radio and threshold 1 and the comparison result between the RRM measurement result via the low-power wake-up receiver and threshold 2 satisfy a condition, the terminal can perform the RRM measurement switch.

[0163] For example, when a condition for RRM measurement switching is satisfied, the terminal may perform an RRM measurement switching operation. After determining to perform the RRM measurement switching operation, the terminal may receive a low-power RRM signal and perform RRM measurement on the low-power RRM signal. In another example, after a preset time from the time at which the terminal determines to perform the RRM measurement switching operation, the terminal may receive a low-power RRM signal and perform RRM measurement on the low-power RRM signal. The base station may transmit information about the preset time to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal may receive information about the preset time through signaling from the base station. Alternatively, the preset time may vary depending on the implementation of the terminal.

[0164] A terminal can perform RRM measurements using a low-power wake-up receiver. If certain conditions are met while the terminal is performing RRM measurements using the low-power wake-up receiver, the terminal can perform RRM measurements using the main radio. If the terminal performs RRM measurements using the main radio, the RRM measurements using the low-power wake-up receiver of the terminal can be stopped. The terminal can replace the RRM measurements using the low-power wake-up receiver with the RRM measurements using the main radio. The terminal can report the results of the RRM measurements using the main radio to the base station.

[0165] If a condition for RRM measurement switching is satisfied for a preset time (e.g., a condition threshold time) or longer, the terminal may perform an RRM measurement switching operation. For another example, the terminal may perform the RRM measurement switching operation immediately when a condition for RRM measurement switching is satisfied. For another example, if a condition for RRM measurement switching is satisfied for a threshold number of times (e.g., N times) or longer during a preset time, the terminal may perform the RRM measurement switching operation. The threshold may be defined as a condition occurrence threshold. N may be a natural number. The base station may transmit configuration information for RRM measurement switching to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal may receive the configuration information for RRM measurement switching through signaling from the base station. The configuration information for RRM measurement switching may include at least one of a condition (e.g., a threshold), a condition threshold time, or a condition occurrence threshold for RRM measurement switching. The condition for RRM measurement switching may be referred to as a measurement switching condition. The measurement switching condition may be the result of a comparison between the RRM measurement result and a threshold. For example, the measurement switching condition may be when the RRM measurement result is greater than (or exceeds) the threshold and / or when the RRM measurement result is less than (or below) the threshold. The RRM measurement result may refer to an RRM measurement result using a low-power wake-up receiver or the main radio. The RRM measurement result using a low-power wake-up receiver may refer to an RRM measurement result using a low-power RRM signal.

[0166] The base station can transmit information about a threshold used for RRM measurement switching (e.g., a threshold for determining whether a measurement switching condition occurs, a condition threshold time, and / or a condition occurrence threshold) to the terminal through signaling. The terminal can receive information about the threshold used for RRM measurement switching through signaling from the base station. Information about the threshold used for RRM measurement switching can be included in configuration information for RRM measurement switching (e.g., measurement configuration information). The threshold used for RRM measurement switching can be indicated (e.g., configured) by an offset with respect to a threshold used for existing RRM measurements. The threshold used for existing RRM measurements can be a threshold used for RRM measurements for cell selection.

[0167] The above threshold may be set differently depending on the type of low-power wake-up receiver. For example, the threshold may be set differently depending on whether the low-power wake-up receiver receives an OFDM signal. The threshold for an OFDM-based low-power wake-up receiver capable of receiving an OFDM signal may be set differently from the threshold for an OOK-based low-power wake-up receiver that cannot receive an OFDM signal. An OOK-based low-power wake-up receiver that cannot receive an OFDM signal may be an OOK-based low-power wake-up receiver capable of receiving an OOK signal. The thresholds may be set individually.

[0168] The terminal can apply a threshold received from the base station according to the type of the terminal (e.g., a low-power wake-up receiver included in the terminal). The base station can set (e.g., instruct) the terminal to set a threshold for an OFDM-based low-power wake-up receiver and a threshold for an OOK-based low-power wake-up receiver. If the type of the terminal (e.g., a low-power wake-up receiver included in the terminal) is an OFDM-based low-power wake-up receiver, the terminal can perform an RRM measurement switching operation using the threshold for the OFDM-based low-power wake-up receiver. If the type of the terminal (e.g., a low-power wake-up receiver included in the terminal) is an OOK-based low-power wake-up receiver, the terminal can perform an RRM measurement switching operation using the threshold for the OOK-based low-power wake-up receiver.

[0169] If the conditions for RRM measurement switching are satisfied, the terminal can perform an RRM measurement switching operation. After determining to perform the RRM measurement switching operation, the terminal can receive a signal (e.g., SSB) from the base station and perform RRM measurement on the signal. As another example, after a preset time from the time at which the terminal determines to perform the RRM measurement switching operation, the terminal can receive a signal from the base station and perform RRM measurement on the signal. The base station can transmit information on the preset time to the terminal through signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information on the preset time through signaling from the base station. Alternatively, the preset time may vary depending on the implementation of the terminal.

[0170] Each method and / or result of RRM measurement using the main radio of the terminal may be different from the method and / or result of RRM measurement using the low-power wake-up receiver of the terminal. The threshold used for switching from the RRM measurement operation using the main radio to the RRM measurement operation using the low-power wake-up receiver may be different from the threshold used for switching from the RRM measurement operation using the low-power wake-up receiver to the RRM measurement operation using the main radio. The threshold used for switching from the RRM measurement operation using the main radio to the RRM measurement operation using the low-power wake-up receiver and the threshold used for switching from the RRM measurement operation using the low-power wake-up receiver to the RRM measurement operation using the main radio may be independently set (e.g., instructed) to the terminal in the communication system.

[0171] FIG. 11 is a flowchart illustrating embodiments of RRM measurement switching operations in a communication network.

[0172] Referring to FIG. 11, a terminal may perform RRM configuration for an RRM measurement operation (S1101). S1101 may be performed based on RRM measurement configuration information and / or RRM measurement switching configuration information received from a base station. The RRM measurement switching configuration information may be included in RRM measurement configuration information (e.g., measurement configuration information). The RRM measurement switching configuration information may be referred to as measurement switching configuration information. Some configurations for the RRM measurement operation may be instructed to the terminal by the base station. The terminal may perform an RRM measurement operation using the main radio (S1102). The terminal may compare the RRM measurement result using the main radio with threshold 1 (S1103). The RRM measurement result and threshold 1 may each be one or more vectors. In other words, the RRM measurement result may include one or more RRM measurement values, and threshold 1 may include one or more thresholds. The comparison between the RRM measurement result and threshold 1 may be a comparison between each RRM measurement value and each threshold. The comparison result between the RRM measurement result and the threshold 1 may be a combination of comparison results for multiple factors.

[0173] If the RRM measurement result exceeds threshold 1 (e.g., is greater than or equal to), the terminal may perform an RRM measurement operation using a low-power wake-up receiver (S1104). If the terminal performs an RRM measurement operation using a low-power wake-up receiver, the terminal may not perform an RRM measurement operation using the main radio. If the RRM measurement result is less than or equal to threshold 1 (e.g., is less than), the terminal may perform an RRM measurement using the main radio (S1102).

[0174] The terminal can compare the RRM measurement result using the low-power wake-up receiver with threshold 2 (S1105). The RRM measurement result and threshold 2 may each be one or more vectors. In other words, the RRM measurement result may include one or more RRM measurement values, and threshold 2 may include one or more thresholds. The comparison between the RRM measurement result and threshold 2 may be a comparison between each RRM measurement value and each threshold. The comparison result between the RRM measurement result and threshold 2 may be a combination of comparison results for multiple factors.

[0175] If the RRM measurement result is less than (e.g., less than or equal to) the threshold value 2, the terminal may perform an RRM measurement operation using the main radio (S1102). If the terminal performs an RRM measurement operation using the main radio, the terminal may not perform an RRM measurement operation using a low-power wake-up receiver. If the RRM measurement result is equal to or greater than (e.g., exceeds) the threshold value 2, the terminal may perform an RRM measurement operation using a low-power wake-up receiver (S1104). In other words, the RRM measurement operation using the low-power wake-up receiver may continue to be performed.

[0176] A terminal can perform RRM measurements using a main radio and / or a low-power wake-up receiver. In addition to RRM measurements using the main radio, the terminal can additionally perform RRM measurements using a low-power wake-up receiver. RRM measurements using a low-power wake-up receiver may refer to RRM measurements based on the reception of a low-power RRM signal. If RRM measurements using a low-power wake-up receiver are additionally performed, the criteria for RRM measurements using the main radio may be relaxed. The base station may relax the RRM measurement criteria of the main radio for a terminal that performs additional RRM measurements using a low-power wake-up receiver. In other words, the base station may transmit configuration information for the relaxed RRM measurement criteria of the main radio to the terminal via signaling. The terminal may receive configuration information for the relaxed RRM measurement criteria of the main radio via signaling from the base station. If RRM measurements using a low-power wake-up receiver are performed, the terminal may perform RRM measurements using the main radio based on the relaxed RRM measurement criteria. The configuration information of the RRM measurement criteria may be included in the RRM measurement configuration information (e.g., measurement configuration information). Alternatively, the configuration information of the RRM measurement criteria may be signaled independently from the RRM measurement configuration information.

[0177] The RRM measurement criteria of the terminal will be described. The terminal can perform RRM measurements a preset number of times or more during a preset time interval. The preset time interval may be X ms, and the preset number of times may be Y. Each of X and Y may be a natural number. The terminal can perform RRM measurements at least Y times within the time interval of X ms. The time interval of X ms may be set periodically. The RRM measurements may be performed periodically. The time interval of X ms (e.g., the periodic time interval) may be determined based on at least one of a discontinuous reception (DRX) cycle, an operating frequency, or a system setting. For example, the time interval of X ms (e.g., the periodic time interval) may be determined based on the result of a product of a value defined based on the DRX cycle and / or the operating frequency and a value according to the system setting. The terminal can perform RRM measurements at least Y times within the time interval. For example, Y may be 2. When the terminal performs RRM measurements Y times within the above time interval, the time interval between RRM measurements within the time interval may be at least Z. In other words, it may be required that the time interval between RRM measurements within one time interval is set to at least Z. Z may be half of a DRX cycle. Z may be set in units of symbol, slot, subframe, or absolute time (e.g., ms). Z may be a natural number.

[0178] If RRM measurement using a low-power wake-up receiver is additionally performed, the cycle of the RRM measurement using the main radio can be set to be longer than the cycle of the RRM measurement using the main radio when RRM measurement using the low-power wake-up receiver is not additionally performed. In other words, a relaxed RRM measurement operation using the main radio can be performed. For example, "if the cycle of the RRM measurement using the main radio is T1 and RRM measurement using the low-power wake-up receiver is additionally performed," the cycle of the RRM measurement using the main radio can be changed from T1 to T2. In other words, a terminal that additionally performs RRM measurement using the low-power wake-up receiver can perform RRM measurement using the main radio based on the cycle T2. T2 can be longer than T1. If RRM measurement using the low-power wake-up receiver is additionally performed, the cycle of the RRM measurement using the main radio can increase. Each of T1 and T2 can be configured in units of symbols, slots, subframes, or absolute time (e.g., ms). Each of T1 and T2 can be a natural number. The base station can transmit information about each of T1 and T2 to the terminal through signaling. The terminal can receive information about each of T1 and T2 through signaling from the base station. T2 can be indicated (e.g., configured) by an offset relative to T1. Information about each of T1 and T2 can be included in the RRM measurement configuration information.

[0179] When additional RRM measurements using a low-power wake-up receiver are performed, the cycle of the RRM measurements using the main radio can be determined based on a product of a DRX cycle, a predefined value based on an operating frequency, a value based on a system setting, and / or a variable value based on the additional RRM measurements. The variable value based on the additional RRM measurements can be 1 or greater. The variable value based on the additional RRM measurements can be a parameter for relaxing the RRM measurement criteria of a terminal that additionally performs RRM measurements using a low-power wake-up receiver. For example, the variable value based on the additional RRM measurements can be a single fixed value. For another example, the variable value based on the additional RRM measurements can be a value indicated (e.g., set) by the base station. For another example, the variable value based on the additional RRM measurements can be a value that varies depending on the DRX cycle of the terminal.

[0180] The low-power wake-up receiver of the terminal may or may not receive SSB. The period of RRM measurement (e.g., RRM measurement using the main radio) may be determined based on whether the low-power wake-up receiver can receive SSB. "If the low-power wake-up receiver can receive SSB and RRM measurement using the low-power wake-up receiver is additionally performed," the criteria (e.g., period) for RRM measurement using the main radio may be further relaxed. In this case, the period of RRM measurement using the main radio may be set to T3. T3 may be a value greater than T1. T3 may be a value greater than T2. ​​T3 may be set in units of symbols, slots, subframes, or absolute time (e.g., ms). T3 may be a natural number. The base station may transmit information about T3 to the terminal through signaling. The terminal may receive information about T3 through signaling from the base station. T3 may be indicated (e.g., set) by an offset to T1 and / or T2.

[0181] If the conditions for RRM measurement relaxation are satisfied for a preset period of time, the terminal may perform a relaxed RRM measurement operation. The time period during which the conditions for RRM measurement relaxation are satisfied may be referred to as a condition satisfaction time period. The preset period of time may be referred to as a condition threshold time period. If the conditions for RRM measurement relaxation are not satisfied for the condition threshold time period, the terminal may not perform the relaxed RRM measurement operation. If the conditions for RRM measurement relaxation are continuously satisfied for the condition threshold time period, the terminal may perform a relaxed RRM measurement operation. If the conditions for RRM measurement relaxation are not satisfied at least once for the condition threshold time period, the condition satisfaction time period may be reset. The base station may transmit configuration information for RRM measurement relaxation to the terminal via signaling. The terminal may receive configuration information for RRM measurement relaxation from the base station. The configuration information for RRM measurement relaxation may be included in RRM measurement configuration information (e.g., measurement configuration information). The configuration information for RRM measurement relaxation may be referred to as configuration information for measurement relaxation. The configuration information for RRM measurement relaxation may include conditions and / or condition threshold times for RRM measurement relaxation. The conditions for RRM measurement relaxation may be a comparison result between an RRM measurement result and a threshold. The RRM measurement result may be at least one of RSRP, RSRQ, RSSI, or SINR.

[0182] The base station can transmit information about the threshold used for RRM measurement relaxation to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information about the threshold used for RRM measurement relaxation via signaling from the base station. Information about the threshold used for RRM measurement relaxation can be included in the configuration information for RRM measurement relaxation. The threshold used for RRM measurement relaxation can be indicated (e.g., configured) based on an offset with respect to a threshold used for existing RRM measurements. The threshold used for existing RRM measurements can be a threshold used for RRM measurements for cell selection.

[0183] The threshold may be one or more values. For example, threshold 1 for the RRM measurement result via the main radio and / or threshold 2 for the RRM measurement result via the low-power wake-up receiver may be indicated (e.g., set) to the terminal. When the terminal receives threshold 1 for the RRM measurement result via the main radio from the base station, the terminal may determine whether to alleviate the RRM measurement using the comparison result between the RRM measurement result via the main radio and threshold 1. When the terminal receives threshold 2 for the RRM measurement result via the low-power wake-up receiver from the base station, the terminal may determine whether to alleviate the RRM measurement using the comparison result between the RRM measurement result via the low-power wake-up receiver and threshold 2.

[0184] When a terminal receives threshold 1 for an RRM measurement result via the main radio and threshold 2 for an RRM measurement result via the low-power wake-up receiver from the base station, the terminal can determine whether to alleviate RRM measurement using the comparison result between the RRM measurement result via the main radio and threshold 1 and the comparison result between the RRM measurement result via the low-power wake-up receiver and threshold 2. For example, when both the comparison result between the RRM measurement result via the main radio and threshold 1 and the comparison result between the RRM measurement result via the low-power wake-up receiver and threshold 2 satisfy a condition, the terminal can perform an RRM measurement alleviation operation.

[0185] The combination of RRM measurement switching and RRM measurement relaxation operations will be described. A terminal can perform RRM measurements using its main radio. The terminal can use threshold 1 to determine whether to switch RRM measurements. The terminal can use threshold 2 to determine whether to relax RRM measurements. The terminal can receive information about threshold 1 and / or threshold 2 from the base station. If threshold 1 and / or threshold 2 are not indicated (e.g., configured), the terminal can use default values ​​for the thresholds to determine whether to switch RRM measurements and / or relax RRM measurements.

[0186] If the RRM measurement result using the main radio exceeds threshold 1 (e.g., is equal to or greater than threshold 1), the terminal may perform RRM measurement using a low-power wake-up receiver. At this time, the terminal may relax the RRM measurement criteria using the main radio. In other words, if the RRM measurement result using the main radio exceeds threshold 1 (e.g., is equal to or greater than threshold 1), the RRM measurement relaxation operation may be performed. If the RRM measurement result using the main radio exceeds threshold 2 (e.g., is equal to or greater than threshold 1), the terminal may perform RRM measurement using a low-power wake-up receiver. At this time, the terminal may stop RRM measurement using the main radio. In other words, if the RRM measurement result using the main radio exceeds threshold 2 (e.g., is equal to or greater than threshold 1), the RRM measurement operation may be switched. Threshold 2 may be a value greater than threshold 1.

[0187] When a terminal performs RRM measurements using its main radio, the results of the RRM measurements may be transmitted to the base station via the main radio of the terminal. When a terminal performs RRM measurements using a low-power wake-up receiver, the results of the RRM measurements may be transmitted to the base station via the main radio of the terminal.

[0188] FIG. 12 is a flowchart illustrating embodiments of an RRM measurement operation using a low-power RRM signal (e.g., a low-power synchronization signal) in a communication network.

[0189] Referring to FIG. 12, a terminal may transmit terminal configuration information to a base station (S1201). The terminal configuration information may be UE capability information, and a UE capability report including the UE capability information may be transmitted to the base station. The base station may receive terminal configuration information from the terminal (S1201). The terminal configuration information may include information indicating whether the terminal includes a low-power wake-up receiver and / or function information of the low-power wake-up receiver. The base station may configure RRM measurement based on the terminal configuration information (e.g., UE capability information) received from the terminal. In other words, the base station may generate RRM measurement configuration information based on the terminal configuration information (e.g., UE capability information). For another example, the RRM measurement configuration information may be generated without considering the terminal configuration information.

[0190] The base station can transmit RRM measurement configuration information (e.g., measurement configuration information) to the terminal through signaling (S1202). The terminal can receive the RRM measurement configuration information through signaling from the base station (S1202). The terminal can configure RRM measurement based on the RRM measurement configuration information (S1203). The base station can transmit a signal for RRM measurement to the terminal (S1204). The signal for RRM measurement can be transmitted based on the RRM measurement configuration information. The signal for RRM measurement can include a legacy RRM signal and / or a low-power RRM signal. The terminal can receive a signal for RRM measurement from the base station. The signal for RRM measurement can be received based on the RRM measurement configuration information. The terminal can perform RRM measurement on the signal received from the base station (S1205). The RRM measurement can be performed using the main radio and / or the low-power wake-up receiver of the terminal. The terminal can transmit the RRM measurement result to the base station (S1206). Transmission of RRM measurement results can be performed via the main radio of the terminal. The base station can receive RRM measurement results from the terminal (S1206).

[0191] The RRM measurement relaxation operation can be performed on a terminal in the RRC idle state or the RRC inactive state. A terminal in the RRC connected state may not perform the RRM measurement relaxation operation. Alternatively, a terminal in the RRC connected state may perform the RRM measurement relaxation operation. The RRM measurement switching operation can be performed on a terminal in the RRC idle state or the RRC inactive state. A terminal in the RRC connected state may not perform the RRM measurement switching operation. Alternatively, a terminal in the RRC connected state may perform the RRM measurement switching operation.

[0192] RRM measurement relaxation actions can be applied (e.g., performed) to the serving cell. RRM measurements for neighboring cells can be performed using the UE's main radio. RRM measurements using a low-power wake-up receiver may not be supported in neighboring cells. In other words, the UE may not be able to perform RRM measurements for neighboring cells using a low-power wake-up receiver.

[0193] When RRM measurements for a serving cell are performed using a low-power wake-up receiver, the criteria for RRM measurements for neighboring cells (e.g., RRM measurements using the main radio) may be relaxed. When RRM measurements for a serving cell are switched, RRM measurements for the serving cell may be performed using a low-power wake-up receiver instead of the main radio. In this case, the criteria for RRM measurements for neighboring cells (e.g., RRM measurements using the main radio) may be relaxed.

[0194] The methods according to the present disclosure may be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., either singly or in combination. The program instructions recorded on the computer-readable medium may be those specifically designed and configured for the present disclosure or may be known and available to those skilled in the computer software art.

[0195] Examples of computer-readable media include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include not only machine language codes generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present disclosure, and vice versa.

[0196] Although the present disclosure has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

Claims

1. As a terminal method, A step of performing a first measurement operation on a first signal received from a base station using the main radio of the terminal; A step of comparing the result of the first measurement operation with a first threshold; and If the result of the first measurement operation is greater than or equal to the first threshold, a step of performing a second measurement operation on a second signal received from the base station using a low-power receiver of the terminal is included. Terminal method.

2. In claim 1, a step of comparing the result of the second measurement operation with a second threshold; and If the result of the second measurement operation is less than or equal to the second threshold, the method further includes performing the first measurement operation on the first signal received from the base station using the main radio without performing the second measurement operation. Terminal method.

3. In claim 2, Further comprising a step of receiving measurement setting information from the base station, The measurement setting information includes at least one of information for the first measurement operation, information for the second measurement operation, the first threshold, or the second threshold. Terminal method.

4. In claim 2, The first threshold and the second threshold are set to different values, Terminal method.

5. In claim 1, When the second measurement operation is performed, the first measurement operation is stopped. Terminal method.

6. In claim 1, The first measurement operation is a measurement operation for at least one of a serving cell or an adjacent cell, and the second measurement operation is a measurement operation for the serving cell. Terminal method.

7. In claim 1, Each of the above first measurement operation and the above second measurement operation is an RRM (radio resource management) measurement operation. Terminal method.

8. In claim 1, The first signal is a legacy measurement signal, the second signal is a low-power measurement signal, the legacy measurement signal includes at least one of a synchronization signal or a reference signal, and the low-power measurement signal includes at least one of a low-power wake-up signal or a low-power synchronization signal. Terminal method.

9. As a terminal method, A step of performing a first measurement operation on a first signal received from a base station using the main radio of the terminal; A step of comparing the result of the first measurement operation with a first threshold; and If the result of the first measurement operation is greater than or equal to the first threshold, a step of performing a first relaxed measurement operation on the first signal received from the base station using the main radio is included. Terminal method.

10. In claim 9, The cycle of the first relaxed measurement operation is set to be longer than the cycle of the first measurement operation. Terminal method.

11. In claim 9, If the result of the first measurement operation is greater than or equal to the first threshold, the method further includes performing a second measurement operation on a second signal received from the base station using a low-power receiver of the terminal. Terminal method.

12. In claim 11, a step of comparing the result of the second measurement operation with a second threshold; and If the result of the second measurement operation is less than or equal to the second threshold, the method further includes performing the first measurement operation on the first signal received from the base station using the main radio without performing the first relaxed measurement operation and the second measurement operation. Terminal method.

13. In claim 12, Further comprising a step of receiving measurement setting information from the base station, The measurement setting information includes at least one of information for the first measurement operation, information for the first relaxed measurement operation, information for the second measurement operation, the first threshold, or the second threshold. Terminal method.

14. In claim 12, The first threshold and the second threshold are set to different values, Terminal method.

15. In claim 11, Each of the first measurement operation and the first relaxed measurement operation is a measurement operation for at least one of a serving cell or an adjacent cell, and the second measurement operation is a measurement operation for the serving cell. Terminal method.

16. In claim 11, The first signal is a legacy measurement signal, the second signal is a low-power measurement signal, the legacy measurement signal includes at least one of a synchronization signal or a reference signal, and the low-power measurement signal includes at least one of a low-power wake-up signal or a low-power synchronization signal. Terminal method.

17. As a terminal, Main Radio; low power receiver; and Contains at least one processor, At least one processor of the terminal, Performing a first measurement operation on a first signal received from a base station using the main radio; comparing the result of the first measurement operation with the first threshold; and If the result of the first measurement operation is greater than or equal to the first threshold, causing a second measurement operation to be performed on a second signal received from the base station using the low-power receiver. Terminal.

18. In claim 17, At least one processor of the terminal, comparing the result of the second measurement operation with the second threshold; and If the result of the second measurement operation is less than or equal to the second threshold, further causing the first measurement operation to be performed on the first signal received from the base station using the main radio without performing the second measurement operation. Terminal.

19. In claim 18, At least one processor of the terminal, Further causing the measurement setup information to be received from the above base station, The measurement setting information includes at least one of information for the first measurement operation, information for the second measurement operation, the first threshold, or the second threshold. Terminal.

20. In claim 17, The first measurement operation is a measurement operation for at least one of a serving cell or an adjacent cell, and the second measurement operation is a measurement operation for the serving cell. Terminal.

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