Method and apparatus for performing rrm measurements in a communication system

Abstract

A method and apparatus for RRM measurement in a communication system are disclosed. The method for a terminal includes the steps of performing a first measurement operation on a first signal received from a base station by 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 by using a low-power receiver of the terminal if the result of the first measurement operation is equal to or greater than the first threshold.

Description

Technical Field

[0001] This disclosure relates to radio resource management (RRM) techniques in communication systems, and more specifically, to RRM techniques in terminals that support low-power operation. Background Technology

[0002] With the advancement of information and communication technologies, various wireless communication technologies are developing. Representative wireless communication technologies include Long Term Evolution (LTE), LTE-A Advanced (LTE-A), and New Radio (NR), all specified as standards under the 3GPP (3rd Generation Partnership Project) framework. LTE and / or LTE-A can be considered fourth-generation (4G) communication technologies. NR can be considered fifth-generation (5G) communication technologies.

[0003] Following the commercialization of 4G communication systems (e.g., systems supporting LTE and / or LTE-A), 5G communication systems (e.g., NR-enabled systems) using higher frequency bands (e.g., 6 GHz or lower) are being considered to handle the surge in wireless data. 5G communication systems can support enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and / or massive machine-type communication (mMTC).

[0004] In 5G communication systems, low-power wake-up signals and low-power wake-up receivers for receiving these signals can be considered to reduce terminal power consumption. Terminals can perform radio resource management (RRM) measurements in the communication system using a 5G receiver (e.g., an existing receiver). When using the terminal's low-power wake-up receiver to perform RRM measurements, the power consumption of the terminal's RRM measurements can be reduced. An RRM measurement method to support the above operations may be required.

[0005] Furthermore, the above-described techniques are intended to enhance understanding of the background of this disclosure, and they may include non-prior techniques not yet known to those skilled in the art. Summary of the Invention

[0006] [Technical Issues]

[0007] This disclosure, intended to address the aforementioned problems, aims to provide a method and apparatus for radio resource measurement (RRM) in a communication system.

[0008] [Technical Solution]

[0009] According to an exemplary embodiment of the present disclosure, a method of a terminal may include: performing a first measurement operation on a first signal received from a base station using the terminal's main radio; comparing the 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 the terminal's low-power receiver in response to the result of the first measurement operation being equal to or greater than the first threshold.

[0010] The method may further include: comparing the result of the second measurement operation with a second threshold; and in response to the result of the second measurement operation being less than or equal to the second threshold, performing a first measurement operation on the first signal received from the base station using the main radio, without performing the second measurement operation.

[0011] The method may further include: receiving measurement configuration information from a base station, wherein the measurement configuration information includes information for a first measurement operation, information for a second measurement operation, and at least one of a first threshold or a second threshold.

[0012] The first threshold and the second threshold can be set to different values.

[0013] The first measurement operation can be paused while the second measurement operation is being performed.

[0014] The first measurement operation may be a measurement operation targeting at least one of the serving cell or neighboring cells, and the second measurement operation may be a measurement operation targeting the serving cell.

[0015] Each of the first and second measurement operations can be a Radio Resource Management (RRM) measurement operation.

[0016] The first signal can be a conventional measurement signal, and the second signal can be a low-power measurement signal. The conventional measurement signal can include at least one of a synchronization signal or a reference signal, and the low-power measurement signal can include at least one of a low-power wake-up signal or a low-power synchronization signal.

[0017] According to an exemplary embodiment of the present disclosure, a method of a terminal may include: performing a first measurement operation on a first signal received from a base station using the terminal's main radio; comparing the result of the first measurement operation with a first threshold; and performing a first relaxation measurement operation on the first signal received from the base station using the main radio in response to the result of the first measurement operation being equal to or greater than the first threshold.

[0018] The period of the first relaxation measurement operation can be set to be longer than the period of the first measurement operation.

[0019] The method may further include: in response to the result of the first measurement operation being greater than or equal to a first threshold, performing a second measurement operation on a second signal received from a base station using a low-power receiver of the terminal.

[0020] The method may further include: comparing the result of the second measurement operation with a second threshold; and in response to the result of the second measurement operation being less than or equal to the second threshold, performing a first measurement operation on the first signal received from the base station using the main radio, without performing a first relaxation measurement operation and a second measurement operation.

[0021] The method may further include: receiving measurement configuration information from a base station, wherein the measurement configuration information includes information for a first measurement operation, information for a first relaxation measurement operation, information for a second measurement operation, and at least one of a first threshold or a second threshold.

[0022] The first threshold and the second threshold can be set to different values.

[0023] Each of the first measurement operation and the first relaxation measurement operation can be a measurement operation for at least one of the serving cell or neighboring cells, and the second measurement operation can be a measurement operation for the serving cell.

[0024] The first signal can be a conventional measurement signal, and the second signal can be a low-power measurement signal. The conventional measurement signal can include at least one of a synchronization signal or a reference signal, and the low-power measurement signal can include at least one of a low-power wake-up signal or a low-power synchronization signal.

[0025] According to an exemplary embodiment of the present disclosure, a terminal may include: a main radio, a low-power receiver, and at least one processor, wherein the at least one processor may enable the terminal to perform: performing a first measurement operation on a first signal received from a base station using the terminal's main radio; comparing the result of the first measurement operation with a first threshold; and performing a second measurement operation on a second signal received from a base station using the terminal's low-power receiver in response to the result of the first measurement operation being equal to or greater than the first threshold.

[0026] The at least one processor can also cause the terminal to perform: comparing the result of the second measurement operation with a second threshold; and in response to the result of the second measurement operation being less than or equal to the second threshold, performing a first measurement operation on the first signal received from the base station using the main radio, without performing the second measurement operation.

[0027] The at least one processor can also enable the terminal to perform: receiving measurement configuration information from the base station, wherein the measurement configuration information includes information for the first measurement operation, information for the second measurement operation, and at least one of a first threshold or a third threshold.

[0028] The first measurement operation may be a measurement operation targeting at least one of the serving cell or neighboring cells, and the second measurement operation may be a measurement operation targeting the serving cell.

[0029] [Beneficial Effects]

[0030] According to this disclosure, the terminal may include a low-power receiver and a main radio. The terminal can perform RRM measurement operations using the main radio, and when the RRM measurement result is equal to or greater than a threshold, the terminal can perform RRM measurement operations using the low-power receiver. Alternatively, when the result of the RRM measurement operation is equal to or greater than the threshold, the terminal can perform a relaxed RRM measurement using the main radio and perform the RRM measurement using the low-power receiver. Therefore, the RRM measurement operation of the terminal can be improved, the power consumption of the terminal during RRM measurement can be reduced, and the performance of the communication system can be improved. Attached Figure Description

[0031] Figure 1 This is a conceptual diagram illustrating a first exemplary embodiment of a communication network.

[0032] Figure 2 This is a block diagram illustrating a first exemplary embodiment of communication nodes constituting a communication network.

[0033] Figure 3 This is a conceptual diagram illustrating a first exemplary embodiment of a system frame in a communication network.

[0034] Figure 4 This is a conceptual diagram illustrating a first exemplary embodiment of a subframe in a communication network.

[0035] Figure 5 This is a conceptual diagram illustrating a first exemplary embodiment of a time slot in a communication network.

[0036] Figure 6 This is a conceptual diagram illustrating an exemplary embodiment of signal monitoring operations in a communication network.

[0037] Figure 7 This is a conceptual diagram illustrating an exemplary embodiment of RRC state transitions of a terminal in a communication network.

[0038] Figure 8 This is a block diagram illustrating an exemplary embodiment of a communication node configured in a communication network.

[0039] Figure 9 This is a sequence diagram illustrating an exemplary embodiment of a method for receiving a low-power synchronization signal in a communication network.

[0040] Figure 10This is a sequence diagram illustrating an exemplary embodiment of an RRM method using low-power RRM signals (e.g., low-power synchronization signals) in a communication network.

[0041] Figure 11 This is a flowchart illustrating an exemplary embodiment of an RRM measurement switching operation in a communication network.

[0042] Figure 12 This is a sequence diagram illustrating an exemplary embodiment of RRM measurement operation using a low-power RRM signal (e.g., a low-power synchronization signal) in a communication network. Detailed Implementation

[0043] While this disclosure is capable of various modifications and alternatives, specific embodiments thereof are illustrated by way of example in the accompanying drawings and will be described in detail herein. However, it should be understood that this disclosure is not intended to be limited to the specific forms disclosed; rather, it is intended to cover all modifications, equivalents, and substitutions falling within the spirit and scope of this disclosure. Throughout the description of the accompanying drawings, the same reference numerals refer to the same elements.

[0044] It should be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] In exemplary embodiments of this disclosure, "at least one of A and B" may refer to "at least one of A or B" or "at least one of a combination of one or more of A and B". Furthermore, in exemplary embodiments of this disclosure, "one or more of A and B" may refer to "one or more of A or B" or "one or more of a combination of one or more of A and B".

[0046] In exemplary embodiments of this disclosure, “(re)transmit” can mean “transmit”, “retransmit”, or “transmit and retransmit”, “(re)configure” can mean “configure”, “reconfigure”, or “configure and reconfigure”, “(re)connect” can mean “connect”, “reconnect”, or “connect and reconnect”, and “(re)access” can mean “access”, “reaccess”, or “access and reaccess”.

[0047] It should be understood that when an element is described as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Conversely, when an element is described as "directly connected" or "directly coupled" to another element, there are no intermediate elements. Other terms used to describe the relationship between elements should be interpreted in a similar manner (i.e., "between" and "directly between," "adjacent" and "directly adjacent," etc.).

[0048] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular forms used herein are also intended to include the plural forms. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “comprising” as used herein specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0049] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms (as defined in a common dictionary) shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0050] In the following description, preferred exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. For ease of general understanding in describing the present disclosure, the same components in the drawings are designated by the same reference numerals, and repeated descriptions thereof will be omitted.

[0051] The following describes a communication network applied according to exemplary embodiments of the present disclosure. The communication network applied according to exemplary embodiments of the present disclosure is not limited to what is described below, and according to the present disclosure, exemplary embodiments can be applied to various communication networks. Here, communication network can be used in the same sense as communication system. Communication network can refer to wireless communication network, while communication system can refer to wireless communication system.

[0052] In this disclosure, "an operation (e.g., a transmission operation) is configured" can mean "sending configuration information (e.g., information elements or parameters) to indicate the operation and / or information to be performed." "An information element (e.g., a parameter) is configured" can mean "the corresponding information element is sent by signaling." In this disclosure, signaling can be at least one of system information (SI) signaling (e.g., sending a system information block (SIB) and / or a master information block (MIB)), RRC signaling (e.g., sending RRC parameters and / or higher-level parameters), MAC control element (CE) signaling, or PHY signaling (e.g., sending downlink control information (DCI), uplink control information (UCI), and / or sidelink control information (SCI)).

[0053] Figure 1 This is a conceptual diagram illustrating a first exemplary embodiment of a communication network.

[0054] Reference Figure 1 Base station 110 can support cellular communication (e.g., Long Term Evolution (LTE), LTE-A Advanced (LTE-A), LTE-A Pro, LTE Unlicensed (LTE-U), New Radio (NR), and NR Unlicensed (NR-U) as specified by the 3GPP standard). Base station 110 can support Multiple-Input Multiple-Output (MIMO) (e.g., Single-User MIMO (SU-MIMO), Multi-User MIMO (MU-MIMO), Massive MIMO, etc.), Cooperative Multipoint (CoMP), or Carrier Aggregation (CA), etc. Terminal 120 can perform communication with base station 110 (e.g., uplink communication and / or downlink communication).

[0055] The communication nodes (i.e., base stations, terminals, etc.) that constitute the above-mentioned communication network can support communication protocols based on Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Single Carrier FDMA (SC-FDMA), Orthogonal Frequency Division Multiplexing (OFDM), or Orthogonal Frequency Domain Multiple Access (OFDMA), etc.

[0056] In communication nodes, a base station can be referred to as Node B, Evolved Node B, 5G Node B (gNodeB), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Access Point, Access Node, or Transmit / Receive Point (Tx / Rx Point), etc. In communication nodes, a terminal can be referred to as User Equipment (UE), Access Terminal, Mobile Terminal, Station, User Station, Portable User Station, Mobile Station, Node, or Equipment, etc. Communication nodes can have the following structures.

[0057] Figure 2 This is a block diagram illustrating a first exemplary embodiment of communication nodes constituting a communication network.

[0058] Reference Figure 2 The communication node 200 may include at least one processor 210, memory 220, and transceiver 230 connected to the network for performing communication. Furthermore, the communication node 200 may also include an input interface device 240, an output interface device 250, and a storage device 260, etc. Each component included in the communication node 200 may communicate with each other, for example, by being connected via a bus 270.

[0059] However, each component included in communication node 200 may not be connected to the common bus 270, but may instead be connected to processor 210 via an individual interface or a separate bus. For example, processor 210 may be connected via a dedicated interface to at least one of memory 220, transceiver 230, input interface device 240, output interface device 250, and storage device 260.

[0060] Processor 210 can execute a program stored in at least one of memory 220 and storage device 260. Processor 210 may refer to a central processing unit (CPU), graphics processing unit (GPU), or dedicated processor, on which the method according to embodiments of the present disclosure is executed. Each of memory 220 and storage device 260 may be constituted by at least one of volatile storage medium and non-volatile recording medium. For example, memory 220 may include at least one of read-only memory (ROM) and random access memory (RAM).

[0061] The following describes the operation methods of communication nodes in a communication network. Even when a method (e.g., transmitting or receiving a signal) to be performed at a first communication node is described, a corresponding second communication node can also perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed at the first communication node. That is, when 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, when the operation of a second terminal is described, a corresponding first terminal can perform an operation corresponding to the operation of the second terminal.

[0062] Figure 3 This is a conceptual diagram illustrating a first exemplary embodiment of a system frame in a communication network.

[0063] Reference Figure 3Time resources in a communication network can be divided into frames. For example, each system frame with a length of 10 milliseconds (ms) can be configured consecutively in the time domain of the communication network. The system frame number (SFN) can be set to #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 system frames after system frame #1023 can be set to #0.

[0064] A system frame can include two half-frames, and the length of a half-frame can be 5ms. The half-frame located in the start region of the system frame can be called "half-frame #0", and the half-frame located in the end region of the system frame can be called half-frame #1. A system frame can include 10 subframes, and the length of a subframe can be 1ms. The 10 subframes within a system frame can be called "subframes #0 to #9".

[0065] Figure 4 This is a conceptual diagram illustrating a first exemplary embodiment of a subframe in a communication network.

[0066] Reference Figure 4 A subframe can include n time slots, where n can be a natural number. Therefore, a subframe can consist of one or more time slots.

[0067] Figure 5 This is a conceptual diagram illustrating a first exemplary embodiment of a time slot in a communication network.

[0068] Reference Figure 5 A time slot can include one or more symbols. Figure 5 A time slot, as shown, can consist of 14 symbols. Here, the length of the time slot can vary depending on the number and length of the symbols included in the time slot. Alternatively, the length of the time slot can vary based on a set of parameters. When the subcarrier spacing is 15 kHz (e.g., μ=0), the time slot length can be 1 ms. In this case, a system frame can include 10 time slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the time slot length can be 0.5 ms. In this case, a system frame can include 20 time slots.

[0069] When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, a system frame can include 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, a system frame can include 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, a system frame can include 160 slots.

[0070] Symbols can be configured as downlink (DL) symbols, flexible (FL) symbols, or uplink (UL) symbols. A time slot consisting only of DL symbols is called a "DL time slot", a time slot consisting only of FL symbols is called a "flexible (FL) time slot", and a time slot consisting only of UL symbols is called a "UL time slot".

[0071] Reference signals may include channel state information reference signals (CSI-RS), sounding reference signals (SRS), demodulation reference signals (DM-RS), or phase tracking reference signals (PT-RS). Channels may include physical downlink control channels (PDCCH), physical downlink shared channels (PDSCH), physical uplink control channels (PUCCH), physical uplink shared channels (PUSCH), physical sidelink control channels (PSCCH), or physical sidelink shared channels (PSSCH). In this disclosure, control channels may refer to PDCCH, PUCCH, or PSCCH, and data channels may refer to PDSCH, PUSCH, or PSSCH.

[0072] The following describes methods for transmitting and receiving data in a communication network. In downlink communication, downlink data can be transmitted via the PDSCH. In uplink communication, uplink data can be transmitted via the PUSCH. In this disclosure, PDSCH may refer to downlink data or resources for transmitting and receiving downlink data, and PUSCH may refer to uplink data or resources for transmitting and receiving uplink data. A base station may transmit downlink control information (DCI) on the PDCCH, including configuration information of the PDSCH (e.g., resource allocation information, scheduling information). In this disclosure, PDCCH may refer to DCI (e.g., control information) or resources for transmitting DCI.

[0073] The terminal can receive DCI on the PDCCH and identify the PDSCH configuration information included in the DCI. For example, the PDSCH configuration information may include Time Domain Resource Allocation (TDRA), Frequency Domain Resource Allocation (FDRA), information about transmit resources for feedback to the PDSCH, and / or Modulation and Coding Scheme (MCS) information. TDRA can indicate the resource region of the PDSCH in the time domain. FDRA can indicate the resource region of the PDSCH in the frequency domain. MCS information can indicate the MCS level or MCS index.

[0074] A base station can configure a bandwidth portion (BWP) for downlink communication. Each BWP can be configured differently for each terminal. The base station can notify the terminal of the BWP configuration information via higher-layer signaling. A terminal can have one or more BWPs configured. The terminal can receive BWP configuration information from the base station and identify the BWP configured by the base station based on this information. When multiple BWPs are configured for downlink communication, the base station can activate one or more of them. The base station can send the configuration information of the activated BWP to the terminal using at least one of higher-layer signaling, a Media Access Control (MAC) element (CE), or a Digital Access Control (DCI). The base station can use the activated BWP to perform downlink communication. The terminal can identify the activated BWP by receiving its configuration information from the base station and can perform downlink reception operations (e.g., downlink communication) within the activated BWP.

[0075] This disclosure describes a method for monitoring the PDCCH. A terminal can perform a monitoring operation on the PDCCH to receive PDSCH transmitted from a base station. This monitoring operation on the PDCCH can be referred to as a PDCCH monitoring operation. The base station can use higher-layer messages (e.g., Radio Resource Control (RRC) messages) to notify the terminal of configuration information for the PDCCH monitoring operation. The configuration information for the PDCCH monitoring operation may include control resource set (CORESET) information and / or search space information.

[0076] CORESET information may include PDCCH demodulation reference signal (DMRS) information, PDCCH precoding information, and PDCCH timing information. The PDCCH DMRS can be the DMRS used for demodulating the PDCCH. The PDCCH timing can be the region where the PDCCH may exist. In other words, the PDCCH timing can be the region where DCI can be transmitted. The PDCCH timing information may include time resource information and / or frequency resource information for the PDCCH timing. In the time domain, the length of the PDCCH timing can be indicated in symbols. In the frequency domain, the size of the PDCCH timing (e.g., Physical Resource Block (PRB) or Common Resource Block (CRB)) can be indicated in RBs.

[0077] Search space information may include the CORESET identifier (ID) associated with the search space, as well as the period and / or offset of PDCCH monitoring. The periodicity and offset of PDCCH monitoring can each be indicated in time slots. Search space information may also include the index of the symbol at the start of PDCCH monitoring operations.

[0078] The paging method in a communication network will be described below. Based on the RRC configuration with the base station (e.g., RRC connection), the terminal's state (e.g., RRC state) can be classified into RRC connected state, RRC inactive state, and RRC idle state. The terminal's state can transition according to the RRC configuration with the base station. For example, when the terminal establishes an RRC connection with the base station, the terminal's state can be RRC connected state. When the RRC connection between the terminal and the base station is released, the terminal's state can transition to RRC idle state. When the RRC connection between the terminal and the base station is suspended, the terminal's state can transition to RRC inactive state.

[0079] The terminal's signal monitoring operation may vary depending on the terminal's state (e.g., RRC connected state, RRC inactive state, or RRC idle state). The terminal can perform signal monitoring operations in RRC connected state based on the configuration of CORESET and search space. The terminal can periodically perform signal monitoring operations for a specific duration, depending on its configuration in RRC inactive or RRC idle state, and may not perform signal monitoring operations for other durations. The terminal not performing signal monitoring operations may indicate that it is operating in sleep mode. The terminal performing signal monitoring operations may indicate that it is operating in active mode.

[0080] Figure 6 This is a conceptual diagram illustrating an exemplary embodiment of signal monitoring operations in a communication network.

[0081] Reference Figure 6 The terminal can periodically perform signal monitoring operations in the time domain. The signal monitoring operation can be performed within a signal monitoring duration. The signal monitoring duration can exist periodically. The base station can send configuration information for the signal monitoring duration to the terminal via signaling. The terminal can receive the configuration information for the signal monitoring duration from the base station via signaling. The configuration information for the signal monitoring duration can include at least one of the following: the duration of the signal monitoring duration, the period of the signal monitoring duration, or the time offset of the signal monitoring duration. The signal monitoring duration can include an on duration and an off duration. The configuration information for the signal monitoring duration can include information about the on duration and / or the off duration. The terminal can perform signal monitoring operations during the on duration. The terminal can choose not to perform signal monitoring operations during the off duration. Because the terminal's signal monitoring operation is not performed during the off duration of the signal monitoring duration, the terminal's power consumption can be reduced.

[0082] Figure 7 This is a conceptual diagram illustrating an exemplary embodiment of RRC state transitions of a terminal in a communication network.

[0083] Reference Figure 7 The terminal can perform signal monitoring operations in the RRC inactive state or the RRC idle state (S701). The terminal can perform signal monitoring operations periodically. The signal monitoring operation can be a monitoring operation of paging signals. The base station can send a paging signal to the terminal (e.g., a terminal in the RRC inactive state or the RRC idle state) (S702). The base station can send the paging signal within the terminal's signal monitoring duration (e.g., the on-duration duration within the signal monitoring duration). The terminal can receive the paging signal from the base station. The terminal that receives the paging signal can send an RRC connection request to the base station (S703). The signal monitoring operation of the terminal after receiving the paging signal may be different from the signal monitoring operation of the terminal before receiving the paging signal. In order to change the terminal's RRC state, the terminal can send and receive signaling with the base station. According to the above operations, the terminal's RRC state can be changed to the RRC connected state. The terminal can operate in the RRC connected state (S704).

[0084] The terminal can monitor paging signals in RRC inactive or RRC idle states. Signal monitoring operations for paging can be performed in conjunction with... Figure 6 The exemplary embodiments are performed in the same or similar manner. The base station can send paging configuration information to the terminal via signaling. The paging configuration information can be included in a System Information Block (SIB) sent by the base station. The terminal can receive the paging configuration information from the base station via signaling. The paging configuration information can include at least one of the paging monitoring period, the time offset of the monitoring period, or the length of the signal monitoring duration for the paging. Paging (e.g., paging signal or paging message) can be sent via DCI. The terminal can perform PDCCH monitoring (e.g., paging timing (PO) monitoring) to receive paging.

[0085] The terminal can periodically perform monitoring operations to receive paging in an RRC inactive or RRC idle state. During the duration of no paging monitoring, the terminal may not receive signals. This operation reduces the terminal's power consumption. In communication networks (e.g., communication systems), to further reduce terminal power consumption, monitoring signals other than paging can be considered, as this requires less power than monitoring paging.

[0086] To reduce power consumption during signal monitoring operations in a terminal within a communication network, a low-power wake-up signal (LP-WUS) and / or a low-power wake-up receiver (LP-WUR) can be considered. The power required for monitoring the LP-WUS in a terminal may be less than the power required for monitoring paging in the terminal. A terminal may include a LP-WUS receiver. The LP-WUS receiver can be used to receive the LP-WUS. The power consumption of the LP-WUS receiver may be less than the power consumption of an existing receiver (e.g., a receiver for receiving paging). A terminal may include an existing receiver and / or a LP-WUS receiver. A terminal can use an existing receiver to receive existing signals (e.g., paging) and can use a LP-WUS receiver to receive the LP-WUS. The existing receiver may refer to the main radio. In this disclosure, for convenience, the LP-WUS may be referred to as a low-power signal or a wake-up signal, and the LP-WUS receiver may be referred to as a low-power receiver or a wake-up receiver.

[0087] The base station can transmit a low-power wake-up signal. The terminal can monitor the low-power wake-up signal. The terminal can use a low-power wake-up receiver to monitor the low-power wake-up signal. The low-power wake-up receiver can be configured separately from the terminal's existing receivers (such as a signal receiver or main radio). In other words, the terminal can include both a low-power wake-up receiver and its existing receivers.

[0088] Figure 8 This is a block diagram illustrating an exemplary embodiment of a communication node configured in a communication network.

[0089] Reference Figure 8 The 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 the main radio and the low-power wake-up receiver may be distinguished by software within the same hardware. As another example, the main radio and the low-power wake-up receiver may be configured as different hardware components. The terminal may receive signals via an antenna. The received signals may be passed to the main radio and / or the low-power wake-up receiver. As another example, the antenna for the main radio and the antenna for the low-power wake-up receiver may be configured independently in 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 the detection information of the signal to the main radio. The main radio may receive the detection information of the low-power wake-up signal from the low-power wake-up receiver. The main radio may send information for the operation of the low-power wake-up receiver to the low-power wake-up receiver, and the low-power wake-up receiver may receive the information for the operation from the main radio.

[0090] The low-power wake-up signal can be a signal modulated using an on / off keying (OOK) scheme. The low-power wake-up signal may include coded information. In other words, the low-power wake-up signal can be transmitted in the form of coded information. At least one of channel coding, cyclic redundancy check (CRC), or repeated transmission can be applied to the information bits of the low-power wake-up signal, and the low-power wake-up signal can be transmitted. The low-power wake-up signal can be transmitted in sequence. Depending on the information to be transmitted by the base station, the low-power wake-up signal can be configured into different sequences. This sequence can be a binary sequence.

[0091] OFDM sequences can be overlaid on low-power wake-up signals using an OOK modulation scheme. For example, an OFDM sequence (e.g., an OFDM modulation sequence) can be overlaid on the "ON" symbol in an OOK symbol (e.g., an OOK signal), and an OOK signal overlaid with an OFDM sequence can be transmitted. Low-power wake-up receivers that cannot receive OFDM signals can interpret the signal as an OOK signal. Low-power wake-up receivers that can receive OFDM signals can extract the OFDM sequence from the signal.

[0092] Depending on the base station configuration, the OFDM sequence of the low-power wake-up signal may or may not cover it. The base station can send information to the terminal via signaling indicating whether the OFDM sequence covers the low-power wake-up signal. The terminal can receive this information from the base station and determine whether the OFDM sequence covers the low-power wake-up signal based on this information.

[0093] A base station can transmit information through overlay of OFDM sequences. For example, a base station can overlay one of multiple OFDM sequence candidates onto an OOK symbol and transmit the information by transmitting the OOK symbol that overlays one OFDM sequence candidate. This transmission (e.g., transmission scheme) can be called "overlay transmission (e.g., overlay transmission scheme)". A base station can perform 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 candidate sequence) from multiple OFDM sequence candidates from the base station and obtain information from the received OFDM sequence.

[0094] As another example, a base station can transmit one of one or more OFDM sequence candidates based on an coverage transmission scheme. In this case, the base station can use the location of the OOK symbol covering an OFDM sequence to transmit information. A terminal can receive one OFDM sequence (e.g., an OFDM candidate sequence) transmitted by the base station from one or more OFDM sequence candidates, identify the location of the OOK symbol covering the received OFDM sequence, and identify (e.g., obtain) information based on the identified location.

[0095] A terminal can obtain information transmitted via a low-power wake-up signal by receiving an OFDM sequence overlaid on the OOK symbol. The low-power wake-up signal can be generated based on the OFDM sequence. The terminal can receive the OFDM sequence overlaid on the OOK symbol and identify the same information as that transmitted via the low-power wake-up signal based on the OFDM sequence. In other words, the terminal can identify 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 identify a portion of the information transmitted via the low-power wake-up signal based on the OFDM sequence.

[0096] The base station can send information about the OFDM sequence overlaid on the OOK symbol to the terminal (hereinafter referred to as OFDM sequence related information). OFDM sequence related information may include at least one of the following information.

[0097] - Length of the OFDM sequence

[0098] - Root value used to generate OFDM sequences

[0099] - Circular shift value used to generate OFDM sequences

[0100] The base station may send higher-layer messages (e.g., RRC configuration, RRC information) to the terminal that include at least one of the aforementioned information. As another example, the base station may send system information (e.g., MIB and / or SIB) to the terminal that includes at least one of the aforementioned information. The terminal may receive at least one of the aforementioned information from the base station and identify OFDM sequence-related information (e.g., information about OFDM sequences overlaid on OOK symbols) based on the received information.

[0101] The subcarrier spacing of the low-power wake-up signal can be the same as the subframe spacing used by the base station to transmit signals other than low-power wake-up. For example, the subcarrier spacing of the low-power wake-up signal can be the same as the subcarrier spacing of the BWP (e.g., the subcarrier spacing configured for the BWP). As another example, the subcarrier spacing of the low-power wake-up signal can be indicated by the base station. The base station can send information about the subcarrier spacing of the low-power wake-up signal to the terminal via higher-layer information or system information blocks. The terminal can receive information about the subcarrier spacing of the low-power wake-up signal from the base station via higher-layer information or system information blocks. The terminal can receive the low-power wake-up signal based on the information about the subcarrier spacing. In this disclosure, a system information block can refer to a MIB and / or a SIB.

[0102] As another example, a predefined value can be used as the subcarrier spacing for the low-power wake-up signal. The base station can use the predefined subcarrier spacing to transmit the low-power wake-up signal. The terminal can use the predefined subcarrier spacing to receive the low-power wake-up signal. As another example, when the terminal receives information about the subcarrier spacing of the low-power wake-up signal from the base station, it can use the subcarrier spacing indicated by the base station to receive the low-power wake-up signal. When the terminal does not receive information about the subcarrier spacing of the low-power wake-up signal from the base station, the terminal can use a predefined subcarrier spacing (e.g., a predefined value) to receive the low-power wake-up signal.

[0103] Monitoring for receiving low-power wake-up signals can be configured for the low-power wake-up receiver. The monitoring scheme for low-power wake-up signals can be integrated with... Figure 6 The exemplary embodiments are the same or similar. Monitoring of low-power wake-up signals can be performed periodically. The monitoring duration of low-power wake-up signals can be configured periodically.

[0104] Synchronization between a base station and a terminal (e.g., time synchronization) may be necessary for the terminal to receive a low-power wake-up signal. To achieve synchronization (e.g., time synchronization), the base station can send a low-power synchronization signal. The terminal can receive the low-power synchronization signal from the base station and obtain synchronization (e.g., time synchronization) based on the received low-power synchronization information.

[0105] A low-power synchronization signal can be transmitted using an OOK modulation scheme. For example, a low-power synchronization signal can be transmitted using an OOK-M modulation scheme. To transmit a low-power synchronization signal based on the OOK-M modulation scheme, the value of M can be determined. M can be a natural number. For example, the value of M used for transmitting a low-power synchronization signal based on the OOK-M modulation scheme can be the same as the value of M used for transmitting a low-power wake-up signal based on the OOK-M modulation scheme. As another example, the value of M used for transmitting a low-power synchronization signal based on the OOK-M modulation scheme can be different from the value of M used for transmitting a low-power wake-up signal based on the OOK-M modulation scheme. The value of M used for transmitting a low-power synchronization signal based on the OOK-M modulation scheme can be equal to or greater than (e.g., exceeding) the value of M used for transmitting a low-power wake-up signal based on the OOK-M modulation scheme. Alternatively, the value of M used for transmitting a low-power synchronization signal based on the OOK-M modulation scheme can be equal to or less than (e.g., lower than) the value of M used for transmitting a low-power wake-up signal based on the OOK-M modulation scheme.

[0106] A base station can send information related to a low-power synchronization signal to a terminal. In this disclosure, the information related to the low-power synchronization signal can 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 the following: the transmission period of the low-power synchronization signal, the time offset of the low-power synchronization signal transmission, information about the sequence used to configure the low-power synchronization signal, information about the multi-beam transmission of the low-power synchronization signal, or information about the transmission frequency of the low-power signal. In an exemplary embodiment, the base station can use system information blocks to send the information. For example, the base station can send the low-power synchronization information to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, DCI). The terminal can receive the low-power synchronization information from the base station. The terminal can use the low-power synchronization information to receive the low-power synchronization signal from the base station.

[0107] Low-power synchronization signals 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 terminal on the transmission period of the low-power synchronization signal via signaling (e.g., system information). The terminal can receive information about the transmission period of the low-power synchronization signal from the base station. This information can be received via system information. The terminal can receive the low-power synchronization signal from the base station using the transmission period indicated by the base station. The terminal can... Figure 6 The periodic signal monitoring for receiving low-power synchronization signals is performed in the same or similar manner as the exemplary embodiments.

[0108] Low-power synchronization signals can be transmitted aperiodically in the time domain. When necessary, the base station can transmit aperiodic low-power synchronization signals. The base station can provide the terminal with information related to the transmission of aperiodic low-power synchronization signals (e.g., low-power synchronization information, low-power synchronization configuration information). The low-power synchronization information may 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 may include at least one of the following: information about resources for the aperiodic low-power synchronization signal (e.g., time resource information and / or frequency resource information), information about the sequence for configuring the aperiodic low-power synchronization signal, or information about the beam for transmitting the aperiodic low-power synchronization signal. The terminal can receive low-power synchronization information (e.g., information related to the transmission of the aperiodic low-power synchronization signal). The terminal can receive the aperiodic low-power synchronization signal from the base station based on the received low-power synchronization information.

[0109] 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.

[0110] Aperiodic low-power synchronization signals can be transmitted using different time resources than periodic low-power synchronization signals. The transmission duration of the aperiodic low-power synchronization signal may not overlap with that of the periodic low-power synchronization signal. The transmission duration of the aperiodic low-power synchronization signal can be indicated to the terminal by a time offset from the transmission duration of the periodic low-power synchronization signal. The terminal can receive information about the transmission duration of the periodic low-power synchronization signal from the base station. The terminal can also receive information about the time offset of the transmission duration of the aperiodic low-power synchronization signal from the base station. The terminal can use the information about the transmission duration of the periodic low-power synchronization signal and the information about the time offset of the transmission duration of the aperiodic low-power synchronization signal to identify the transmission duration of the aperiodic low-power synchronization signal. The terminal can receive the aperiodic low-power synchronization signal from the base station within the determined transmission duration.

[0111] The transmission period of the low-power synchronization signal can be set to be the same as the transmission period of the base station's synchronization signal block (SSB). When the transmission period of the low-power synchronization signal is the same as the transmission period of the SSB, the base station does not need to separately indicate information about the transmission period of the low-power synchronization signal to the terminal. When the terminal does not receive information about the transmission period of the low-power synchronization signal from the base station (e.g., when the transmission period of the low-power synchronization signal is not indicated or configured to the terminal), the terminal can determine (e.g., understand, estimate, consider) that the transmission period of the low-power synchronization signal is the same as the transmission period of the SSB.

[0112] When the transmission period of the low-power synchronization signal is the same as the transmission period of the SSB, 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 time domain before the SSB. For example, a multiplexing operation of the low-power synchronization signal and the SSB can be performed such that the last symbol of the low-power synchronization signal precedes the first symbol of the SSB. In this disclosure, a symbol can refer to an OFDM symbol. Alternatively, the low-power synchronization signal can be multiplexed in the time domain after the SSB. For example, a multiplexing operation of the low-power synchronization signal and the SSB can be performed such that the first symbol of the low-power synchronization signal follows the last symbol of the SSB.

[0113] Low-power synchronization signals can be transmitted multiplexed with SSBs in the frequency domain. Low-power synchronization signals can also be multiplexed in a frequency region lower than the SSB in the frequency domain. For example, multiplexing of a low-power synchronization signal and an SSB can be performed such that the last subcarrier of the low-power synchronization signal has a lower subcarrier index than the first subcarrier of the SSB. Alternatively, low-power synchronization signals can be multiplexed in a frequency region higher than the SSB in the frequency domain. For example, multiplexing of a low-power synchronization signal and an SSB can be performed such that the first subcarrier of the low-power synchronization signal has a higher subcarrier index than the last subcarrier of the SSB.

[0114] The base station can indicate (e.g., configure) the transmission location of the low-power synchronization signal to the terminal. The base station can send information about the transmission location of the low-power synchronization signal to the terminal via signaling (e.g., system information, RRC information, MAC CE, and / or DCI). The terminal can receive information about the transmission location of the low-power synchronization signal from the base station via signaling. The terminal can determine the transmission location of the low-power synchronization signal based on the signaling messages from the base station.

[0115] In the time domain, the position of a low-power synchronization signal (e.g., the start position) 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, time slots, subframes, or frames. The reference time for the low-power synchronization signal can be the transmission position of the SSB. For example, the reference time for the low-power synchronization signal can be the first or last symbol of the 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 timing. 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 start position) of the low-power wake-up signal.

[0116] In the frequency domain, the position of a low-power synchronization signal can be indicated by its frequency offset from a reference point. This frequency offset can be set in units of PRBs or subcarriers. Depending on the system configuration, the reference point for the low-power synchronization signal can be "point A". The position of the low-power synchronization signal in the frequency domain can be indicated by its frequency offset from point A. As another example, the reference point for the low-power synchronization signal can be the transmission position of the SSB (e.g., the start subcarrier or the end subcarrier). The position of the low-power synchronization signal in the frequency domain can be indicated by its frequency offset from the transmission position of the SSB (e.g., the start subcarrier or the end subcarrier). As 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 its frequency offset from the position of CORESET#0 (e.g., the lowest or highest frequency resource of CORESET#0).

[0117] Low-power synchronization signals may include sequences, and these sequences can vary based on the base station's configuration. The base station can transmit different sequences via low-power synchronization signals depending on its configuration. For example, the sequence of a low-power synchronization signal can vary based on the base station's cell ID. The number of sequences used for low-power synchronization signals can vary based on the base station's configuration. The sequence of a low-power synchronization signal can be determined based on the base station's cell ID and the number of candidate sequences available for use with the low-power synchronization signal.

[0118] The base station can indicate the sequence configuration information of the low-power synchronization signal to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). RRC configuration can refer to an RRC message. The sequence configuration information of the low-power synchronization signal can include the number of candidate sequences for the low-power synchronization signal. The number of candidate sequences can refer to the number of different sequences transmitted as low-power synchronization signals. The terminal can use the sequence configuration information of the low-power synchronization signal to perform low-power synchronization information detection.

[0119] If the sequence configuration information for the low-power synchronization signal is not transmitted to the terminal, the base station can generate a sequence using default values ​​and send the low-power synchronization signal including that sequence to the terminal. If the terminal does not receive the sequence configuration information for the low-power synchronization signal from the base station, the terminal can assume that the sequence of the low-power synchronization signal was generated using default values. The terminal can perform the low-power synchronization signal reception operation based on this assumption. The default value can indicate the number of sequences. For example, the default value can indicate that the number of sequences is 1. As another example, the default value can indicate that the number of sequences is 3. Alternatively, the default value can be defined based on the base station's cell ID and a predefined equation. In other words, the sequence of the low-power synchronization signal can be defined based on the base station's cell ID and a predefined equation, and this sequence can be used as the default sequence.

[0120] 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., an OOK symbol). This sequence can refer to an OFDM sequence (e.g., a sequence modulated using an OFDM scheme). This sequence can overlay the "ON" symbol in the OOK symbol, and the OOK symbol overlaid with this sequence (e.g., an OOK signal, a low-power synchronization signal) can be transmitted. A low-power wake-up receiver that cannot receive OFDM signals can interpret the OFDM signal (e.g., a low-power synchronization signal overlaid with an OFDM sequence) as an OOK signal (e.g., an OOK modulated signal). A low-power wake-up receiver that can receive OFDM signals can obtain the OFDM sequence from the OFDM signal (e.g., a low-power synchronization signal overlaid with an OFDM sequence).

[0121] Depending on the base station configuration, the OFDM sequence may or may not overlap with the low-power synchronization signal. The base station can send information to the terminal via signaling indicating whether the OFDM sequence overlaps with the low-power synchronization signal. The terminal can receive the information from the base station via signaling and determine whether the OFDM sequence overlaps with the low-power synchronization signal based on that information.

[0122] Low-power synchronization signals can be transmitted using the same beam as the SSB. The terminal can assume that the low-power synchronization signal and the SSB are quasi-co-located (QCLed). A low-power synchronization signal can have a QCL relationship with an SSB. The base station can send the QCL information of the low-power synchronization signal to the terminal via signaling. The terminal can receive the QCL information of the low-power synchronization signal from the base station via signaling. 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 indicate that the QCL relationship between the low-power synchronization signal and the SSB is QCL type D. As another example, the QCL information of the low-power synchronization signal can indicate that the QCL relationship between the low-power synchronization signal and the SSB is QCL A or QCL C. The terminal can use the QCL information of the low-power synchronization signal to receive the low-power synchronization signal.

[0123] Terminals in RRC idle or RRC inactive state can receive low-power synchronization signals. Terminals in RRC connected state can not receive low-power synchronization signals. Alternatively, terminals in RRC connected state can receive low-power synchronization signals.

[0124] Figure 9 This is a sequence diagram illustrating an exemplary embodiment of a method for receiving a low-power synchronization signal in a communication network.

[0125] Reference Figure 9The base station can send configuration information for a low-power synchronization signal (e.g., low-power synchronization configuration information) to the terminal via signaling (S901). The terminal can receive the configuration information for the low-power synchronization signal from the base station via signaling (S901). The terminal can configure the monitoring of the low-power synchronization signal (e.g., monitoring operation) based on the configuration information received from the base station (S902). The base station can send a low-power synchronization signal to the terminal (S903). The low-power synchronization signal can be sent 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.

[0126] This describes a method for transmitting low-power synchronization signals using multiple beams. A base station can use multiple beams to transmit low-power synchronization signals. Multi-beam transmission can refer to transmitting the same signal using different transmission beams. A base station can repeatedly transmit the same low-power synchronization signal in the time domain. Different transmission beams can be used to perform repeated transmission of the same low-power synchronization signal. A base station can transmit the same low-power synchronization signal N times within a continuous duration in the time domain. N can be a natural number. A base station can use N different transmission beams to transmit low-power synchronization signals N times. The base station can send information to the terminal indicating whether to use multiple beams to transmit low-power synchronization signals. The terminal can receive the information from the base station and determine whether to use multiple beams to transmit low-power synchronization signals based on that information. The base station can indicate information about the number of multiple beams used to transmit low-power synchronization signals to the terminal via signaling. The terminal can determine the number of multiple beams used to transmit low-power synchronization signals from the base station via signaling. The terminal can use this information to receive low-power synchronization signals.

[0127] This section describes the information transmitted via a low-power synchronization signal. In other words, it describes the information included in the low-power synchronization signal. The low-power synchronization signal may include timing information. The timing information may include information indicating the time when the low-power synchronization signal was transmitted. The timing information may include at least one of the frame number, subframe number, timeslot number, or symbol index of the low-power synchronization signal being transmitted. This number may refer to an index. The low-power synchronization signal may include cell information. The cell information may refer to information about the cell in which the low-power synchronization signal was transmitted. The cell information may include a cell ID. The cell ID indicated by the low-power synchronization signal may refer to the entire cell ID or a portion of a cell ID in the communication network.

[0128] Information transmitted via a low-power synchronization signal can be included in the payload of the low-power synchronization information. The terminal can obtain (e.g., identify) the information by decoding the payload included in the low-power synchronization signal. Information transmitted via a low-power synchronization signal can be scrambled into a sequence included in the low-power synchronization signal. In this case, the terminal can obtain (e.g., identify) the information through correlation analysis of the sequence included in the low-power synchronization signal.

[0129] The base station can send information about the transmission power of a low-power synchronization signal to the terminal via signaling (e.g., system information, RRC information, MAC CE, and / or DCI). The transmission power of the low-power synchronization signal can be indicated as an offset relative 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 also be indicated in the form of average energy per resource unit (EPRE). 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 relative to 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 use the above information to determine the transmission power of the low-power synchronization signal.

[0130] The base station can send information about the transmission power of a low-power wake-up signal to the terminal via signaling (e.g., system information, RRC information, MAC CE, and / or DCI). The transmission power of the low-power wake-up signal can be indicated as an offset relative 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 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 relative to 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 use the above information to determine the transmission power of the low-power wake-up signal. The terminal's Radio Resource Management (RRM) method will be described. In a communication network, the terminal can measure the quality of the signal transmitted by the base station. In other words, the terminal can perform RRM measurements. The measurement results can be used for cell determination (e.g., cell selection, cell reselection). Terminals supporting 5G, etc., can perform RRM measurements on signals received from a base station. During the RRM process, the terminal can measure at least one of Reference Received Power (RSRP), Reference Received Quality (RSRQ), Signal-to-Noise Ratio (SINR), or Received Signal Strength Indicator (RSSI). The terminal can send the RRM measurement results to the base station. In this disclosure, the terminal's RRM measurement operation can include the operation of the terminal sending the RRM measurement results to the base station. The RRM measurement operation can be referred to as a measurement operation.

[0131] like Figure 8 As in the exemplary embodiments described, the terminal may include a low-power wake-up receiver and a master 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 a base station. In addition to time synchronization acquisition, the terminal may also perform RRM measurements using the low-power synchronization signal. The terminal may perform RRM measurements on the serving cell based on the low-power synchronization signal received from the base station. The terminal may perform RRM measurements on neighboring cells based on the low-power synchronization signal received from the base station.

[0132] The terminal can measure at least one of RSRP, RSSI, RSRQ, or SINR of signals received from a base station (e.g., low-power synchronization signals, low-power wake-up signals, SSB, reference signals (e.g., DM-RS, CSI-RS, PT-RS), and / or existing NR signals). In this disclosure, a signal used for RRM (e.g., RRM measurement) in a terminal including a low-power wake-up receiver can be referred to as a low-power RRM signal. A signal used for RRM measurement that is a non-low-power RRM signal (e.g., an existing signal, NR signal) can be referred to as a conventional RRM signal. A conventional RRM signal can refer to a conventional measurement signal, and a low-power RRM signal can refer to a low-power measurement signal. A conventional RRM signal can include at least one of a synchronization signal (e.g., SSB) or a reference signal. A conventional RRM signal can be received by the terminal's main radio.

[0133] Low-power RRM signals can include low-power synchronization signals and low-power wake-up signals. A low-power wake-up receiver can receive low-power RRM signals and measure their RSRP (Receiving Power Response Rate). The RSRP of a low-power RRM signal can be referred to as Low Power (LP)-RSRP. LP-RSRP can be defined as the average received power during the ON duration of the OOK symbol of the low-power RRM signal. A low-power wake-up receiver can receive low-power RRM signals and measure their RSSI (Receiving Power Indicator). The RSSI of a low-power RRM signal can be referred to as LP-RSSI. LP-RSSI can be defined as the average received power during the receive duration of the low-power RRM signal. Alternatively, LP-RSSI can be defined as the average received power during the OFF duration of the OOK symbol of the low-power RRM signal. LP-RSRQ can be defined as the value obtained by dividing LP-RSRP by LP-RSSI.

[0134] This section describes a method for performing RRM measurements using a low-power RRM signal. RRM measurement using a low-power RRM signal can refer to RRM measurement using a low-power wake-up receiver. When the terminal environment in the communication network meets certain conditions, the terminal can perform RRM measurements using a low-power RRM signal.

[0135] When the RRM measurement result obtained using the primary radio meets certain conditions, the terminal can perform RRM measurement using a low-power RRM signal. The terminal can perform RRM measurement using a low-power RRM signal when the RRM measurement result obtained using the primary radio is equal to or greater than a threshold. The RRM measurement result value obtained using the primary radio can be at least one of RSRP, RSRQ, SINR, or RSSI. When the RSRP measured using the primary radio is equal to or greater than threshold 1 and the RSRQ measured using the primary 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 can be set to the same threshold used for cell determination (e.g., cell selection, cell reselection) for the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., configured) to be offset from the threshold used for cell determination for the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., configured) from the base station to the terminal.

[0136] When the RRM measurement result obtained using the low-power wake-up receiver meets certain conditions, the terminal can perform RRM measurement using the low-power RRM signal. The terminal can perform RRM measurement using the low-power RRM signal when the RRM measurement result value obtained using the low-power wake-up receiver is equal to or greater than a threshold. The RRM measurement result value obtained using the low-power wake-up receiver can 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 can perform RRM measurement using the low-power RRM signal. Threshold 1 and / or threshold 2 can be set to the same threshold used for cell determination (e.g., cell selection, cell reselection) for the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., configured) to be an offset from the threshold used for cell determination for the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., configured) from the base station to the terminal.

[0137] The terminal can perform RRM measurements using a low-power RRM signal when the RRM measurement results obtained using the main radio and the low-power wake-up receiver meet certain conditions. The terminal can perform RRM measurements using a low-power RRM signal when the RRM measurement results obtained using the main radio and the low-power wake-up receiver are equal to or greater than a threshold. Each of the RRM measurement results obtained using the main radio and the low-power wake-up receiver can be at least one of RSRP, RSRQ, SINR, or RSSI. The terminal can perform RRM measurements using a low-power RRM signal when the RRM measurement result obtained using the main radio is equal to or greater than threshold 1 and the RRM measurement result obtained using the low-power wake-up receiver is equal to or greater than threshold 2.

[0138] The base station can send information about threshold 1 and / or threshold 2 to the terminal via signaling. The terminal can receive information about threshold 1 and / or threshold 2 from the base station via signaling. When the base station instructs (e.g., configures) a threshold for RRM measurement results obtained using the main radio, and the RRM measurement result obtained using the main radio is equal to or greater than the threshold, the terminal can perform RRM measurement using a low-power RRM signal. In this case, RRM measurement using the main radio may be paused. Alternatively, a relaxed RRM measurement can be performed using the main radio. When the base station instructs (e.g., configures) a threshold for RRM measurement results obtained using a low-power wake-up receiver, and the RRM measurement result obtained 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, RRM measurement using a low-power RRM signal can continue. When the base station instructs (e.g., configures) the terminal to set a threshold 1 for RRM measurement results obtained using the main radio and a threshold 2 for RRM measurement results obtained using the low-power wake-up receiver, and the RRM measurement result obtained using the main radio is equal to or greater than threshold 1 and the RRM measurement result obtained using the low-power wake-up receiver is equal to or greater than threshold 2, the terminal can perform RRM measurement using the low-power RRM signal.

[0139] RRM measurements obtained using the terminal's main radio can be measurements for the serving cell and / or neighboring cells. RRM measurements obtained using the terminal's low-power wake-up receiver can also be measurements for the serving cell and / or neighboring cells.

[0140] When the RRM measurement obtained using the main radio or low-power wake-up receiver is equal to or greater than a threshold, the terminal may perform RRM measurements using a low-power RRM signal. The base station may indicate information about the threshold to the terminal via signaling (e.g., system information, RRC configuration, MACCE, and / or DCI). The terminal may receive information about the threshold from the base station and may determine whether to use a low-power RRM signal to perform RRM measurements based on the threshold. When the terminal does not receive information about the threshold from the base station (e.g., when no threshold is indicated or configured to the terminal), the terminal may use a default value for the threshold. The default value for the threshold may be a predefined value in the communication system. Alternatively, the default value for the threshold may be a value defined according to the terminal's implementation.

[0141] The threshold can be configured differently depending on the type of low-power wake-up receiver. The threshold can also be configured differently depending on whether the low-power wake-up receiver can receive OFDM signals. The threshold for OFDM-based low-power wake-up receivers that can receive OFDM signals and the threshold for OOK-based low-power wake-up receivers that cannot receive OFDM signals can be configured differently. OOK-based low-power wake-up receivers that cannot receive OFDM signals can receive OOK signals.

[0142] Thresholds can be configured individually. The terminal can apply thresholds received from the base station based on the terminal type (e.g., a low-power wake-up receiver included in the terminal). The base station can configure thresholds in the terminal for OFDM-based low-power wake-up receivers and thresholds for OOK-based low-power wake-up receivers. When the terminal type (e.g., a low-power wake-up receiver included in the terminal) is an OFDM-based low-power wake-up receiver, the terminal can use the thresholds for OFDM-based low-power wake-up receivers to perform RRM measurements (e.g., RRM handover, RRM relaxation). When the terminal type (e.g., a low-power wake-up receiver included in the terminal) is an OOK-based low-power wake-up receiver, the terminal can use the thresholds for OOK-based low-power wake-up receivers to perform RRM measurements (e.g., RRM handover, RRM relaxation).

[0143] When the RRM measurement result of the main radio or low-power wake-up receiver is equal to or greater than a threshold, the terminal may send (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 equal to or greater than the threshold.

[0144] When the comparison result of the threshold (e.g., the comparison result between the RRM measurement result and the threshold) meets the conditions, the terminal can perform RRM measurement using a low-power RRM signal. The terminal can send information to the base station indicating whether it should perform RRM measurement using a low-power RRM signal. The base station can determine whether the terminal should perform RRM measurement operation using a low-power RRM signal based on the information received from the terminal.

[0145] When the comparison result of the threshold (e.g., the comparison result between the RRM measurement result and the threshold) meets the conditions, the terminal can send relevant information to the base station. The relevant information can be the threshold comparison result. The base station can receive the relevant information from the terminal and determine (e.g., decide) whether the terminal should perform RRM measurements using a low-power RRM signal based on the relevant information. The base station can send information to the terminal instructing it to perform RRM measurements using a low-power RRM signal, or instructing it not to perform RRM measurements using a low-power RRM signal. When the terminal receives information from the base station instructing it to perform RRM measurements using a low-power RRM signal, the terminal can perform RRM measurements using a low-power RRM signal.

[0146] Figure 10 This is a sequence diagram illustrating an exemplary embodiment of an RRM method using low-power RRM signals (e.g., low-power synchronization signals) in a communication network.

[0147] Reference Figure 10 The base station can send RRM measurement configuration information (S1001). The terminal can receive the RRM measurement configuration information from the base station (S1001). The RRM measurement configuration information can be referred to as measurement configuration information. The base station can send an RRM measurement signal for the terminal's main radio (S1002). The RRM measurement signal can be sent based on the RRM measurement configuration information. In step S1003, the terminal can receive the RRM measurement signal from the base station via the main radio and can perform RRM measurement on the RRM measurement signal. The receiving operation of the RRM measurement signal can be performed based on the RRM measurement configuration information. The terminal can determine whether to perform the RRM measurement operation using a low-power wake-up receiver based on the comparison result between the RRM measurement result for the RRM measurement signal and a threshold (S1004). For example, the terminal can compare the RRM measurement result for the RRM measurement signal with the threshold included in the RRM measurement configuration information. When the comparison result meets the condition, the terminal can determine to perform the RRM measurement operation using a low-power wake-up receiver. When the comparison result does not meet the condition, the terminal can determine not to perform the RRM measurement operation using a low-power wake-up receiver.

[0148] When it is determined that an RRM measurement operation using a low-power wake-up receiver is being performed, the terminal may send information to the base station indicating that an RRM measurement operation using a high-power wake-up receiver has been performed. The base station may determine whether the terminal is performing an RRM measurement operation using a low-power wake-up receiver based on the information received from the terminal. Alternatively, the step of sending information to the base station indicating that an RRM measurement operation using a low-power wake-up receiver has been performed may be omitted.

[0149] The base station can send RRM measurement signals (e.g., low-power RRM measurement signal, low-power measurement signal) to the terminal for use with a low-power wake-up receiver. In step S1006, the terminal can receive the low-power RRM measurement signal from the base station via the low-power wake-up receiver and can perform RRM measurements on the low-power RRM measurement signal. The reception operation of the low-power RRM measurement signal can be performed based on RRM measurement configuration information. When the RRM measurement operation of the low-power RRM measurement signal is performed, the RRM measurement operation using the main radio can be paused. In other words, the RRM measurement operation can switch 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 of the low-power RRM measurement signal is performed, a relaxed RRM measurement operation using the main radio can be performed. The period of the relaxed RRM measurement operation can be longer than the period of the RRM measurement operation (e.g., the existing RRM measurement operation).

[0150] When the environment of a terminal in a communication network (e.g., a communication system) meets certain conditions, the terminal can perform RRM measurements using the main radio. The terminal can also perform RRM measurements using the main radio when the RRM measurement results obtained using a low-power RRM measurement signal meet certain conditions. Furthermore, the terminal can perform RRM measurements using the main radio when the RRM measurement results obtained using a low-power wake-up receiver meet certain conditions. Based on the RRM measurement results, a switch can be made between RRM measurement operations using the main radio and RRM measurement operations using the low-power wake-up receiver.

[0151] When the RRM measurement result obtained using a low-power RRM measurement signal is equal to or less than a threshold, the terminal can perform RRM measurement using the main radio. In other words, when the RRM measurement result obtained using a low-power wake-up receiver is equal to or less than a threshold, the terminal can perform RRM measurement using the main radio. In the above cases, the RRM measurement operation using the low-power wake-up receiver can be paused, and the RRM measurement operation can be switched from the low-power wake-up receiver operation to the main radio operation.

[0152] RRM measurement results obtained using low-power synchronization signals can be at least one of RSRP, RSRQ, SINR, or RSSI. When the RSRP measured based on the low-power synchronization signal is equal to or less than threshold 1 and the RSRQ measured based on the low-power synchronization signal is equal to or less than threshold 2, the terminal can perform RRM measurements using the main radio. Threshold 1 and / or threshold 2 can be set to the same thresholds used for cell determination (e.g., cell selection, cell reselection) for the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., set) by an offset from the thresholds used for cell determination for the terminal. Alternatively, threshold 1 and / or threshold 2 can be indicated (e.g., configured) from the base station to the terminal. RRM measurement results obtained using low-power RRM measurement signals can be measurements for the serving cell and / or neighboring cells.

[0153] When the RRM measurement result obtained using a low-power synchronization signal is equal to or less than a threshold, the terminal can perform RRM measurement using the main radio. In other words, when the RRM measurement result obtained using a low-power wake-up receiver is equal to or less than a threshold, the terminal can perform RRM measurement using the main radio. In this case, RRM measurement using a low-power wake-up receiver can be suspended. The base station can send information about the threshold to the terminal via 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 can determine whether to perform RRM measurement operation using the main radio based on the threshold. When the terminal does not receive information about the threshold from the base station (e.g., when no threshold is indicated or set for the terminal), the terminal can use the default value of the threshold. The default value of the threshold can be a predefined value in the communication system. Alternatively, the default value of the threshold can be a value defined according to the terminal's implementation.

[0154] When the RRM measurement result obtained using a low-power RRM measurement signal is equal to or less than a threshold, the terminal can send relevant information to the base station. The base station can receive the relevant information from the terminal. The relevant information can be the RRM measurement result and / or information indicating that the RRM measurement result is equal to or less than the threshold.

[0155] When the comparison between the RRM measurement result obtained using a low-power RRM measurement signal and the threshold meets the conditions, the terminal can perform RRM measurement using the main radio. The terminal can send information to the base station indicating whether it should perform RRM measurement using the main radio. The base station can determine whether the terminal should perform RRM measurement using the main radio based on the information received from the terminal.

[0156] When a threshold comparison result (e.g., a comparison between the RRM measurement result and the threshold) meets the conditions, the terminal can send relevant information to the base station. This relevant information can be the threshold comparison result. The base station can receive this relevant information from the terminal and can determine (e.g., decide) whether the terminal should use the master radio to perform RRM measurements based on this information. The base station can send information to the terminal instructing it to use the master radio to perform RRM measurements, or instructing it not to use the master radio to perform RRM measurements. When the terminal receives information from the base station instructing it to use the master radio to perform RRM measurements, it can use the master radio to perform RRM measurements. When the terminal does not receive information from the base station instructing it to use a low-power wake-up receiver to perform RRM measurements, or when the terminal receives information from the base station instructing it not to use a low-power wake-up receiver to perform RRM measurements, it can use the master radio to perform RRM measurements.

[0157] When a terminal fails to receive a low-power RRM measurement signal for a predetermined duration (hereinafter referred to as the "threshold duration") or longer while performing RRM measurements using a low-power RRM measurement signal, the terminal may perform RRM measurements using the main radio. The base station may send information about the threshold duration to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal may receive information about the threshold duration from the base station. When the terminal does not receive information about the threshold duration from the base station (e.g., when no threshold duration is indicated or configured to the terminal), the terminal may use a default threshold duration value as the threshold duration. The default threshold duration value may be a predefined value in the communication system. Alternatively, the default threshold duration value may be a value defined according to the terminal's implementation. When the terminal fails to receive a low-power RRM measurement signal (e.g., a low-power synchronization signal) for the duration corresponding to the threshold duration indicated by the base station, the terminal may perform RRM measurements using the main radio.

[0158] The terminal can perform RRM measurements based on signals monitored by the terminal. In other words, the receiver used by the terminal for RRM measurements (e.g., the main radio or low-power wake-up receiver) can be determined based on the signals monitored by the terminal. The terminal performing PDCCH monitoring can use the main radio to perform RRM measurements. In other words, the terminal can use the main radio to perform RRM measurements during the duration of PDCCH monitoring.

[0159] When the terminal does not perform low-power wake-up signal monitoring while performing paging opportunity (PO) monitoring or paging early indicator (PEI) monitoring, the terminal can perform RRM measurements using the main radio.

[0160] The terminal can perform RRM measurements using a low-power RRM measurement signal during the duration of low-power wake-up signal monitoring. In other words, when the terminal's current operating state is monitoring for low-power wake-up signals, the terminal can perform RRM measurements using a low-power RRM measurement signal. When the terminal suspends PO monitoring or PEI monitoring and performs low-power wake-up signal monitoring, the terminal can perform RRM measurements using a low-power RRM measurement signal.

[0161] A method for switching RRM measurements for a terminal will be described. When conditions are met while the terminal is performing RRM measurements using the primary radio, the terminal can perform RRM measurements using a low-power wake-up receiver. When the terminal is performing RRM measurements using the low-power wake-up receiver, the terminal can suspend RRM measurements using the primary radio. In other words, when RRM measurements using the low-power wake-up receiver begin, the terminal can suspend RRM measurements using the primary radio. RRM measurements using the primary radio can be suspended in both the serving cell and neighboring cells. Alternatively, RRM measurements using the primary radio can be suspended in the serving cell but not in neighboring cells. The terminal can replace RRM measurements using the primary radio with RRM measurements using the low-power wake-up receiver. That is, a handover operation between RRM measurements using the primary radio and RRM measurements using the low-power wake-up receiver can be performed. The terminal can report the RRM measurement results obtained using the low-power wake-up receiver to the base station. The base station can receive the RRM measurement results from the terminal.

[0162] When the conditions for RRM handover are met for a predetermined duration or longer (e.g., when the time for meeting the RRM handover conditions reaches the predetermined duration or longer), the terminal may perform an RRM handover. If the time for meeting the RRM handover conditions is less than (or not greater than) the predetermined duration, the terminal may not perform an RRM handover. When the conditions for RRM handover are continuously met for the predetermined duration or longer, the terminal may perform an RRM handover. If the conditions for RRM measurement handover are not continuously met, the duration for meeting the RRM measurement handover conditions may be reset. The time for meeting the RRM handover conditions may be called the condition satisfaction time. When the terminal's condition satisfaction time is equal to or greater than (or exceeds) the condition threshold time, the terminal may perform an RRM handover. When the terminal's condition satisfaction time is less than (or not greater than) the condition threshold time, the terminal may not perform an RRM handover. The base station may send RRM handover configuration information to the terminal via signaling. The terminal may receive configuration information for RRM handover from the base station. The RRM handover configuration information may include RRM handover conditions and / or condition threshold times. The RRM handover conditions may be a comparison between RRM measurement results and a threshold. RRM measurement results can be at least one of RSRP, RSRQ, RSSI, or SINR.

[0163] The base station can send information about thresholds used for RRM handover to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive this information via the base station's signaling. This information about the thresholds for RRM handover can be included in configuration information for RRM measurement handover (e.g., measurement configuration information). The thresholds for RRM handover can be indicated (e.g., set) based on an offset from a threshold used for existing RRM measurements. The thresholds for existing RRM measurements could be RRM measurement thresholds used for cell selection.

[0164] Thresholds may include one or more values. For example, a threshold 1 may be indicated (e.g., set) for RRM measurement results obtained via the main radio and / or a threshold 2 may be indicated for the terminal for RRM measurement results obtained via a low-power wake-up receiver. When the terminal receives threshold 1 from the base station for RRM measurement results obtained via the main radio, the terminal may determine whether to switch RRM measurements based on a comparison between the RRM measurement results obtained via the main radio and threshold 1. When the terminal receives threshold 2 from the base station for RRM measurement results obtained via a low-power wake-up receiver, the terminal may determine whether to switch RRM measurements based on a comparison between the RRM measurement results obtained via the low-power wake-up receiver and threshold 2.

[0165] When a terminal receives threshold 1 for RRM measurement results obtained via the main radio and threshold 2 for RRM measurement results obtained via the low-power wake-up receiver from the base station, the terminal can determine whether to switch RRM measurements based on the comparison results between the RRM measurement results obtained via the main radio and threshold 1, and the comparison results between the RRM measurement results obtained via the low-power wake-up receiver and threshold 2. For example, the terminal can perform RRM handover when both the comparison results between the RRM measurement results obtained via the main radio and threshold 1, and the comparison results between the RRM measurement results obtained via the low-power wake-up receiver and threshold 2, meet the conditions.

[0166] For example, when the conditions for RRM handover are met, the terminal can perform an RRM measurement handover operation. After determining to perform the RRM measurement handover operation, the terminal can receive a low-power RRM measurement signal and perform RRM measurement on the low-power RRM measurement signal. As another example, after a predetermined time from the time the terminal determines to perform the RRM measurement handover operation, the terminal can receive a low-power RRM measurement signal and perform RRM measurement on the low-power RRM measurement signal. The base station can send information about the predetermined time to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information about the predetermined time via signaling from the base station. Alternatively, the predetermined time can vary depending on the implementation of the terminal.

[0167] The terminal can perform RRM measurements using a low-power wake-up receiver. When predetermined 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. RRM measurements using the low-power wake-up receiver can be paused while the terminal is performing RRM measurements using the main radio. The terminal can substitute RRM measurements using the main radio for RRM measurements using the low-power wake-up receiver. The terminal can report the RRM measurement results obtained via the main radio to the base station.

[0168] The terminal may perform an RRM measurement handover operation when the conditions for RRM measurement handover are met within a predetermined time (e.g., a condition threshold time) or longer. As another example, the terminal may perform an RRM measurement handover operation immediately when the conditions for RRM measurement handover are met. As yet another example, the terminal may perform an RRM measurement handover operation when the conditions for RRM measurement handover are met at least a threshold number (e.g., N times) within a predetermined time. The threshold can be defined as a condition occurrence threshold. N can be a natural number. The base station may send configuration information for RRM measurement handover to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal may receive the RRM measurement handover configuration information from the base station via signaling. The RRM measurement handover configuration information may include at least one of the RRM measurement handover conditions (e.g., a threshold), a condition threshold time, or a condition occurrence threshold. The conditions for RRM measurement handover may be referred to as measurement handover conditions. Measurement handover conditions may be a comparison between an RRM measurement result and a threshold. For example, the measurement switching condition could be that the RRM measurement result is equal to or greater than (or exceeds) a threshold and / or that the RRM measurement value is less than (or not greater than) a threshold. The RRM measurement result could refer to the RRM measurement value obtained through a low-power wake-up receiver or the main radio. The RRM measurement result obtained through a low-power wake-up receiver could refer to the RRM measurement result obtained through a low-power RRM measurement signal.

[0169] The base station can send information about thresholds used for RRM measurement handover to the terminal via signaling (e.g., thresholds for determining whether a measurement handover condition has occurred, condition threshold time, and / or condition occurrence threshold). The terminal can receive information about the thresholds used for RRM measurement handover from the base station via signaling. This information about the thresholds used for RRM measurement handover can be included in the RRM measurement handover configuration information (e.g., measurement configuration information). Each threshold used for RRM measurement handover can be indicated (e.g., set) based on an offset from the thresholds used for existing RRM measurements. The thresholds used for existing RRM measurements can be RRM measurement thresholds used for cell selection.

[0170] The threshold can be set differently depending on the type of low-power wake-up receiver. For example, the threshold can be set differently depending on whether the low-power wake-up receiver can receive OFDM signals. The threshold for an OFDM-based low-power wake-up receiver that can receive OFDM signals and the threshold for an OOK-based low-power wake-up receiver that cannot receive OFDM signals can be set differently. An OOK-based low-power wake-up receiver that cannot receive OFDM signals can be an OOK-based low-power wake-up receiver that can receive OOK signals. The threshold can be set individually.

[0171] The terminal can apply thresholds received from the base station based on its type (e.g., a low-power wake-up receiver included in the terminal). The base station can set (e.g., instruct) thresholds for OFDM-based low-power wake-up receivers and thresholds for OOK-based low-power wake-up receivers. When the terminal type (e.g., a low-power wake-up receiver included in the terminal) is an OFDM-based low-power wake-up receiver, the terminal can use the threshold for OFDM-based low-power wake-up receivers to perform RRM measurement handover operations. When the terminal type (e.g., a low-power wake-up receiver included in the terminal) is an OOK-based low-power wake-up receiver, the terminal can use the threshold for OOK-based low-power wake-up receivers to perform RRM measurement handover operations.

[0172] When the conditions for RRM measurement handover are met, the terminal can perform an RRM measurement handover operation. After determining to perform the RRM measurement handover operation, the terminal can receive a signal (e.g., SSB) from the base station and perform RRM measurements on that signal. As another example, after a predetermined time from the time the terminal determines to perform the RRM measurement handover operation, the terminal can receive a signal from the base station and perform RRM measurements on that signal. The base station can send information about the predetermined time to the terminal via signaling (e.g., system information, RRC configuration, MAC CE, and / or DCI). The terminal can receive information about the predetermined time from the base station via signaling. Alternatively, the predetermined time can vary depending on the terminal's implementation.

[0173] The method and / or results of performing RRM measurements using the terminal's main radio may differ from the method and / or results of performing RRM measurements using the terminal's low-power wake-up receiver. The threshold used to switch from RRM measurement operation using the main radio to RRM measurement operation using the low-power wake-up receiver may differ from one or more thresholds used to switch from RRM measurement operation using the low-power wake-up receiver to RRM measurement operation using the main radio. The thresholds used to switch from RRM measurement operation using the main radio to RRM measurement operation using the low-power wake-up receiver and the thresholds used to switch from RRM measurement operation using the low-power wake-up receiver to RRM detection operation using the main radio may be set (e.g., indicated) independently to the terminal in the communication system.

[0174] Figure 11 This is a flowchart illustrating an exemplary embodiment of an RRM measurement switching operation in a communication network.

[0175] Reference Figure 11 The terminal can perform RRM configuration for RRM measurement operations (S1101). Step S1101 can be performed based on RRM measurement configuration information received from the base station and / or configuration information for RRM measurement handover. The configuration information for RRM measurement handover can be included in the RRM measurement configuration information (e.g., measurement configuration information). The configuration information for RRM measurement handover can be referred to as measurement handover configuration information. The base station can indicate some configurations for the RRM measurement operation to the terminal. The terminal can perform the RRM measurement operation using the main radio (S1102). The terminal can compare the RRM measurement result obtained through the main radio with threshold 1 (S1103). Each of the RRM measurement result and threshold 1 can include one or more vectors. In other words, the RRM measurement result can include one or more RRM measurement values, and threshold 1 can include one or more thresholds. The comparison between the RRM measurement result and threshold 1 can be a comparison between each RRM measurement value and each threshold. The comparison result between the RRM measurement result and threshold 1 can be a combination of comparison results of multiple elements.

[0176] When the RRM measurement result is greater than (e.g., equal to or greater than) threshold 1, the terminal can perform the RRM measurement operation using a low-power wake-up receiver (S1104). When the terminal performs the RRM measurement operation using a low-power wake-up receiver, the terminal can perform the RRM measurement operation without using the main radio. When the RRM measurement result is equal to or less than (e.g., less than) threshold 1, the terminal can perform the RRM measurement using the main radio (S1102).

[0177] The terminal can compare the RRM measurement result obtained through the low-power wake-up receiver with threshold 2 (S1105). Each of the RRM measurement result and threshold 2 can include one or more vectors. In other words, the RRM measurement result can include one or more RRM measurement values, and threshold 2 can include one or more thresholds. The comparison between the RRM measurement result and threshold 2 can be a comparison between each RRM measurement value and each threshold. The comparison result between the RRM measurement result and threshold 2 can be a combination of comparison results of multiple elements.

[0178] When the RRM measurement result is less than (e.g., equal to or less than) threshold 2, the terminal can perform the RRM measurement operation using the main radio (S1102). When the terminal performs the RRM measurement operation using the main radio, the terminal can perform the RRM measurement operation without using the low-power wake-up receiver. When the RRM measurement result is equal to or greater than (e.g., greater than) threshold 2, the terminal can perform the RRM measurement operation using the low-power wake-up receiver (S1104). In other words, the RRM measurement operation using the low-power wake-up receiver can continue to be performed.

[0179] The terminal can perform RRM measurements using the main radio and / or a low-power wake-up receiver. In addition to RRM measurements using the main radio, the terminal can also perform RRM measurements using a low-power wake-up receiver. RRM measurements using a low-power wake-up receiver can refer to RRM measurements based on the reception of low-power RRM signals. When additional RRM measurements using a low-power wake-up receiver are performed, the standard for performing RRM measurements using the main radio can be relaxed. For terminals performing additional RRM measurements using a low-power wake-up receiver, the base station can relax the RRM measurement standard of the main radio. In other words, the base station can send configuration information about the relaxed RRM measurement standard of the main radio to the terminal via signaling. The terminal can receive configuration information about the relaxed RRM measurement standard of the main radio from the base station via signaling. When performing RRM measurements using a low-power wake-up receiver, the terminal can perform RRM measurements using the main radio based on the relaxed RRM measurement standard. The configuration information of the RRM measurement standard can be included in the RRM measurement configuration information (e.g., measurement configuration information). Alternatively, the configuration information about the RRM measurement standard can be sent by signaling independently of the RRM measurement configuration information.

[0180] This describes the standards for terminal RRM measurements. A terminal can perform at least a predetermined number of RRM measurements within a predetermined duration. The predetermined duration can be X ms, and the predetermined number can be Y. Each of X and Y can be a natural number. A terminal can perform at least Y RRM measurements within a duration of X milliseconds. The X milliseconds duration can be configured periodically. RRM measurements can be performed periodically. The X ms time period (e.g., the periodic duration) can be determined based on at least one of a Discontinuous Receive (DRX) period, an operating frequency, or a system configuration. For example, the X ms duration (e.g., the periodic duration) can be determined based on the result of multiplying a value defined based on the DRX period and / or the operating frequency with a value according to the system configuration. The terminal can perform at least Y RRM measurements within this duration. For example, Y can be 2. When the terminal performs Y RRM measurements within the duration, the time interval between RRM measurements within the duration can be at least Z. In other words, it may be necessary to set the time interval between RRM measurements within a single duration to at least Z. Z can be half of the DRX period. Z can be set in units of symbols, slots, subframes, or absolute time (e.g., ms). Z can be a natural number.

[0181] When additional RRM measurements using a low-power wake-up receiver are performed, the period for RRM measurements using the main radio can be set longer than the period for RRM measurements using the main radio without additional RRM measurements using a low-power wake-up receiver. In other words, a relaxed RRM measurement operation using the main radio can be performed. For example, when the period for RRM measurements using the main radio is T1, and additional RRM measurements using a low-power wake-up receiver are performed, the period for performing RRM measurements using the main radio can change from T1 to T2. In other words, a terminal performing additional RRM measurements using a low-power wake-up receiver can perform RRM measurements using the main radio based on a period of T2. T2 can be greater than T1. When additional RRM measurements using a low-power wake-up receiver are performed, the period for RRM measurements using the main radio may increase. Each of T1 and T2 can be set in units of symbols, time slots, subframes, or absolute time (e.g., ms). Each of T1 and T2 can be a natural number. The base station can send information about each of T1 and T2 to the terminal via signaling. The terminal can receive information about each of T1 and T2 from the base station via signaling. T2 can be indicated (e.g., set) based on its offset from T1. Information about each of T1 and T2 can be included in the RRM measurement configuration information.

[0182] When additional RRM measurements are performed using a low-power wake-up receiver, the period of the RRM measurement using the main radio can be determined based on the result of multiplying by the DRX period, a predefined value, based on the operating frequency, a value according to system configuration, and / or a variable value according to the additional RRM measurement. The variable value according to the additional RRM measurement can be 1 or greater. The variable value according to the additional RRM measurement can be a parameter of the RRM measurement standard used to relax the terminal performing the additional RRM measurement using the low-power wake-up receiver. For example, the variable value according to the additional RRM measurement can be a single fixed value. As another example, the variable value according to the additional RRM measurement can be a value indicated by the base station (e.g., set). As another example, the variable value according to the additional RRM measurement can be a value that varies according to the terminal's DRX period.

[0183] The terminal's low-power wake-up receiver may or may not be able to perform SSB reception. The period of RRM measurement (e.g., RRM measurement using the master radio) can be determined based on whether the low-power wake-up receiver is capable of SSB reception. When the low-power wake-up receiver is capable of SSB reception, and RRM measurement using the low-power wake-up receiver is additionally performed, the criteria for performing RRM measurement using the master radio can be further relaxed (e.g., periodicity). In this case, the period of RRM measurement using the master radio can be set to T3. T3 can be greater than T1. T3 can be greater than T2. ​​T3 can be set in units of symbols, time slots, subframes, or absolute time (e.g., ms). T3 can be a natural number. The base station can send information about T3 to the terminal via signaling. The terminal can receive information about T3 from the base station via signaling. T3 can be indicated (e.g., set) based on the offset from T1 and / or T2.

[0184] When the conditions for RRM measurement relaxation are met within a predetermined time, the terminal can perform a relaxed RRM measurement operation. The time during which the RRM measurement relaxation conditions are met can be called the condition satisfaction time. The predetermined time can be called the condition threshold time. When the RRM measurement relaxation conditions are not met within the condition threshold time, the terminal can choose not to perform a relaxed RRM measurement operation. When the RRM measurement relaxation conditions are continuously met within the condition threshold time, the terminal can perform a relaxed RRM measurement operation. When at least one instance of not meeting the RRM measurement relaxation conditions occurs within the condition threshold time, the condition satisfaction time can be reset. The base station can send RRM measurement relaxation configuration information to the terminal via signaling. The terminal can receive configuration information for RRM measurement relaxation from the base station. The RRM measurement relaxation configuration information can be included in the RRM measurement configuration information (e.g., measurement configuration information). The RRM measurement relaxation configuration information can be called measurement relaxation configuration information. The RRM measurement relaxation configuration information can include the RRM measurement relaxation conditions and / or the condition threshold time. The RRM measurement relaxation conditions can be a comparison between the RRM measurement result and a threshold. RRM measurement results can be at least one of RSRP, RSRQ, RSSI, or SINR.

[0185] The base station can send 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 this information from the base station via signaling. This information about the threshold used for RRM measurement relaxation can be included in configuration information for RRM measurement relaxation. The threshold used for RRM measurement relaxation can be indicated (e.g., set) based on an offset from a threshold used for existing RRM measurements. The threshold used for existing RRM measurements could be a threshold used for RRM measurements for cell selection.

[0186] Thresholds may include one or more values. For example, a threshold 1 may be indicated (e.g., set) for RRM measurements obtained via the main radio and / or a threshold 2 may be provided for RRM measurements obtained via a low-power wake-up receiver. When the terminal receives threshold 1 from the base station for RRM measurements obtained via the main radio, the terminal may determine whether to relax the RRM measurement based on a comparison between the RRM measurement obtained via the main radio and threshold 1. When the terminal receives threshold 2 from the base station for RRM measurements obtained via a low-power wake-up receiver, the terminal may determine whether to relax the RRM measurement based on a comparison between the RRM measurement obtained via the low-power wake-up receiver and threshold 2.

[0187] When a terminal receives threshold 1 for RRM measurement results obtained via the main radio and threshold 2 for RRM measurement results obtained via the low-power wake-up receiver from the base station, the terminal can determine whether to relax the RRM measurement based on the comparison between the RRM measurement results obtained via the main radio and threshold 1, and the comparison between the RRM measurement results obtained via the low-power wake-up receiver and threshold 2. For example, when both the comparison between the RRM measurement results obtained via the main radio and threshold 1, and the comparison between the RRM measurement results obtained via the low-power wake-up receiver and threshold 2, meet the conditions, the terminal can perform an RRM measurement relaxation operation.

[0188] This section describes a combination of RRM measurement handover and RRM measurement relaxation operations. The terminal can perform RRM measurements using the master radio. The terminal can use threshold 1 to determine RRM measurement handover. The terminal can use threshold 2 to determine RRM measurement relaxation. The terminal can receive information about threshold 1 and / or threshold 2 from the base station. When threshold 1 and / or threshold 2 are not indicated (e.g., set), the terminal can use the default values ​​of the thresholds to determine RRM measurement handover and / or RRM measurement relaxation.

[0189] When the RRM measurement result obtained via the main radio is greater than (e.g., equal to or greater than) threshold 1, the terminal can perform RRM measurements using a low-power wake-up receiver. In this case, the terminal can relax the criteria for performing RRM measurements using the main radio. In other words, when the RRM measurement result obtained via the main radio is greater than (e.g., equal to or greater than) threshold 1, an RRM measurement relaxation operation can be performed. When the RRM measurement result obtained via the main radio is greater than (e.g., equal to or greater than) threshold 2, the terminal can perform RRM measurements using a low-power wake-up receiver. In this case, the terminal can suspend RRM measurements using the main radio. In other words, when the RRM measurement result obtained via the main radio is greater than (e.g., equal to or greater than) threshold 2, RRM measurement operations can be switched. Threshold 2 can be greater than threshold 1.

[0190] When the terminal performs RRM measurements using the main radio, the RRM measurement results can be transmitted to the base station via the terminal's main radio. When the terminal performs RRM measurements using a low-power wake-up receiver, the RRM measurement results can be transmitted to the base station via the terminal's main radio.

[0191] Figure 12 This is a sequence diagram illustrating an exemplary embodiment of RRM measurement operation using a low-power RRM signal (e.g., a low-power synchronization signal) in a communication network.

[0192] Reference Figure 12The terminal can send terminal configuration information to the base station (S1201). The terminal configuration information may be UE capability information, and the terminal can send a UE capability report including the UE capability information to the base station. The base station can receive the 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 functional information of the low-power wake-up receiver. The base station can configure RRM measurements based on the terminal configuration information (e.g., UE capability information) received from the terminal. In other words, the base station can generate RRM measurement configuration information based on the terminal configuration information (e.g., UE capability information). As another example, RRM measurement configuration information can be generated without considering the terminal configuration information.

[0193] The base station can send RRM measurement configuration information (e.g., measurement configuration information) to the terminal via signaling (S1202). The terminal can receive the RRM measurement configuration information from the base station via signaling (S1202). The terminal can configure RRM measurement based on the RRM measurement configuration information (S1203). The base station can send a signal for RRM measurement to the terminal (S1204). The signal for RRM measurement can be sent based on the RRM measurement configuration information. The signal for RRM measurement may include conventional RRM signals and / or low-power RRM signals. The terminal can receive the 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). RRM measurement can be performed using the terminal's main radio and / or low-power wake-up receiver. The terminal can send the RRM measurement result to the base station (S1206). The RRM measurement result can be sent via the terminal's main radio. The base station can receive the RRM measurement result from the terminal (S1206).

[0194] RRM measurement relaxation operations can be performed on terminals in RRC idle or RRC inactive states. Terminals in RRC connected states may not perform RRM measurement relaxation operations. Alternatively, terminals in RRC connected states may perform RRM measurement relaxation operations. RRM measurement switching operations can be performed on terminals in RRC idle or RRC inactive states. Terminals in RRC connected states may not perform RRM measurement switching operations. Alternatively, terminals in RRC connected states may perform RRM measurement switching operations.

[0195] RRM measurement relaxation operations can be applied to (e.g., performed) the serving cell. RRM measurements of neighboring cells can be performed using the terminal's main radio. Neighboring cells may not support RRM measurements using a low-power wake-up receiver. In other words, the terminal may not use a low-power wake-up receiver to perform RRM measurements of neighboring cells.

[0196] When performing RRM measurements on the serving cell using a low-power wake-up receiver, the RRM measurement criteria for neighboring cells can be relaxed (e.g., using the master radio for RRM measurements). When the RRM measurements for the serving cell are switched, a low-power wake-up receiver can be used instead of the master radio to perform RRM measurements on the serving cell. In this case, the RRM measurement criteria for neighboring cells can be relaxed (e.g., using the master radio for RRM measurements).

[0197] The method according to this disclosure can be implemented in the form of program commands executable by various computer devices and can be recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, etc., individually or in combination. The program commands recorded in the computer-readable recording medium may be specifically designed and configured for this disclosure, or may be known and available to those skilled in the art of computer software.

[0198] Examples of computer-readable recording media may include hardware devices specifically configured to store and execute program commands, such as read-only memory (ROM), random access memory (RAM), and flash memory. Examples of program commands may include not only machine language code, such as code generated by a compiler, but also high-level language code executable by a computer using an interpreter or similar means. The aforementioned hardware device may be configured to operate as at least one software module to perform the operations of this disclosure, and vice versa.

[0199] Although the present disclosure has been described above with reference to exemplary embodiments, those skilled in the art will understand that various modifications and changes may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A method for using a terminal, comprising: The terminal's main radio is used to perform a first measurement operation on the first signal received from the base station; The result of the first measurement operation is compared with the first threshold. and In response to the result of the first measurement operation being equal to or greater than the first threshold, a second measurement operation is performed on the second signal received from the base station using the low-power receiver of the terminal.

2. The method according to claim 1, further comprising: The result of the second measurement operation is compared with the second threshold. and In response to the result of the second measurement operation being less than or equal to the second threshold, the first measurement operation is performed on the first signal received from the base station using the main radio, without performing the second measurement operation.

3. The method according to claim 2, further comprising: The measurement configuration information is received from the base station, wherein the measurement configuration information includes information for the first measurement operation, information for the second measurement operation, and at least one of the first threshold or the second threshold.

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

5. The method according to claim 1, wherein, The first measurement operation is paused while the second measurement operation is being performed.

6. The method according to claim 1, wherein, The first measurement operation is a measurement operation for at least one of the serving cell or neighboring cells, and the second measurement operation is a measurement operation for the serving cell.

7. The method according to claim 1, wherein, Each of the first measurement operation and the second measurement operation is a Radio Resource Management (RRM) measurement operation.

8. The method according to claim 1, wherein, The first signal is a conventional measurement signal, and the second signal is a low-power measurement signal. The conventional 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.

9. A method for using a terminal, comprising: The terminal's main radio is used to perform a first measurement operation on the first signal received from the base station; The result of the first measurement operation is compared with the first threshold. and In response to the result of the first measurement operation being equal to or greater than the first threshold, a first relaxation measurement operation is performed on the first signal received from the base station using the main radio.

10. The method according to claim 9, wherein, The period of the first relaxation measurement operation is set to be longer than the period of the first measurement operation.

11. The method of claim 9, further comprising: In response to the result of the first measurement operation being greater than or equal to the first threshold, a second measurement operation is performed on the second signal received from the base station using the low-power receiver of the terminal.

12. The method of claim 11, further comprising: The result of the second measurement operation is compared with the second threshold. and In response to the result of the second measurement operation being less than or equal to the second threshold, the first measurement operation is performed on the first signal received from the base station using the main radio, without performing the first relaxation measurement operation and the second measurement operation.

13. The method of claim 12, further comprising: Measurement configuration information is received from the base station, wherein the measurement configuration information includes information for the first measurement operation, information for the first relaxation measurement operation, information for the second measurement operation, and at least one of the first threshold or the second threshold.

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

15. The method according to claim 11, wherein, Each of the first measurement operation and the first relaxation measurement operation is a measurement operation for at least one of the serving cell or neighboring cells, and the second measurement operation is a measurement operation for the serving cell.

16. The method according to claim 11, wherein, The first signal is a conventional measurement signal, and the second signal is a low-power measurement signal. The conventional 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.

17. A terminal, comprising: Main radio; Low-power receiver; and At least one processor, Wherein, the at least one processor causes the terminal to execute: The terminal's main radio is used to perform a first measurement operation on the first signal received from the base station; The result of the first measurement operation is compared with a first threshold; and In response to the result of the first measurement operation being equal to or greater than the first threshold, a second measurement operation is performed on the second signal received from the base station using the low-power receiver of the terminal.

18. The terminal according to claim 17, wherein, The at least one processor also causes the terminal to perform: The result of the second measurement operation is compared with the second threshold. and In response to the result of the second measurement operation being less than or equal to the second threshold, the first measurement operation is performed on the first signal received from the base station using the main radio, without performing the second measurement operation.

19. The terminal according to claim 18, wherein, The at least one processor further causes the terminal to perform: receiving measurement configuration information from the base station, wherein the measurement configuration information includes information for the first measurement operation, information for the second measurement operation, and at least one of the first threshold or the second threshold.

20. The terminal according to claim 17, wherein, The first measurement operation is a measurement operation for at least one of the serving cell or neighboring cells, and the second measurement operation is a measurement operation for the serving cell.

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