Method for receiving paging message

Abstract

The present disclosure relates to a technique for providing a service requiring low latency while efficiently reducing battery consumption of a terminal, and can provide a method by which a terminal receives a paging message, and a device, the method comprising the steps of: receiving a wake-up signal (WUS) from a base station through a low power receiver; and monitoring a paging message in a dynamic paging occasion configured on the basis of the WUS.

Description

How to receive paging messages

[0001] The present disclosure relates to a technology for communication operation of a terminal that performs communication by configuring a low-power receiver.

[0002] 3GPP continues to research and develop wireless communication technologies. In wireless communication systems, in addition to latency, stability, and availability, energy efficiency of the terminal is also a crucial consideration. Current terminals may require frequent charging depending on individual usage. Designing for extended battery life is essential for improving energy efficiency and enhancing user experience. Energy efficiency is crucial for terminals without a continuous energy source.

[0003] Power consumption may vary depending on the configured wake-up period length. However, using large DRX cycles to meet battery life requirements, for example, results in high latency, making it unsuitable for services that require both long battery life and low latency.

[0004] As part of this aspect, specific designs are needed to enable terminals to consume power more efficiently when performing wake-up operations.

[0005] The present disclosure aims to provide a technology for providing a service requiring low latency while efficiently reducing battery consumption of a terminal.

[0006] In one aspect, the present embodiments may provide a method for a terminal to receive a paging message, the method including the steps of receiving a wake-up signal (WUS) from a base station through a low-power receiver and monitoring the paging message in a dynamic paging occasion set based on the wake-up signal.

[0007] In another aspect, the present embodiments may provide a method for a base station to transmit a paging message, the method including the steps of transmitting a wake-up signal (WUS) received through a low-power receiver configured in a terminal and controlling transmission of the paging message to the terminal in a dynamic paging occasion set based on the wake-up signal.

[0008] In another aspect, the present embodiments can provide a terminal device including a receiving unit that receives a wake-up signal (WUS) from a base station through a low-power receiver, and a control unit that monitors a paging message in a dynamic paging occasion set based on the wake-up signal, in a terminal that receives a paging message.

[0009] In another aspect, the present embodiments can provide a base station device including a transmitter that transmits a wake-up signal (WUS) received through a low-power receiver configured in a terminal, and a control unit that controls transmission of the paging message to the terminal in a dynamic paging occasion set based on the wake-up signal, in a base station that transmits a paging message.

[0010] The present disclosure can provide a service requiring low latency while efficiently reducing battery consumption of a terminal.

[0011] FIG. 1 is a schematic diagram illustrating the structure of an NR wireless communication system to which the present embodiment can be applied.

[0012] FIG. 2 is a drawing for explaining a frame structure in an NR system to which the present embodiment can be applied.

[0013] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0014] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0015] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0016] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0017] Figure 7 is a drawing for explaining CORESET.

[0018] FIG. 8 is a diagram for explaining a paging message reception operation in a paging occasion according to a conventional DRX cycle.

[0019] FIG. 9 is a diagram for explaining a paging message reception operation in a paging occasion based on a wake-up signal according to one embodiment.

[0020] Figure 10 is a flowchart for explaining terminal operation according to one embodiment.

[0021] Fig. 11 is a flowchart for explaining base station operation according to another embodiment.

[0022] FIG. 12 is a diagram for explaining a paging message monitoring operation in a dynamic paging occasion based on a wake-up signal according to one embodiment.

[0023] FIG. 13 is a diagram for explaining a paging message monitoring operation in a dynamic paging occasion based on a wake-up signal according to another embodiment.

[0024] FIG. 14 is a diagram for explaining a paging message monitoring operation in a dynamic paging occasion based on a wake-up signal according to another embodiment.

[0025] FIG. 15 is a signal diagram for explaining terminal and base station operations based on a wake-up signal according to one embodiment.

[0026] FIG. 16 is a signal diagram for explaining terminal and base station operations based on a wake-up signal according to another embodiment.

[0027] Fig. 17 is a drawing for explaining a terminal configuration according to one embodiment.

[0028] Fig. 18 is a drawing for explaining a base station configuration according to one embodiment.

[0029] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. When adding reference numerals to components in each drawing, identical components may have the same numerals as much as possible even if they are shown in different drawings. In addition, when describing the present embodiments, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the technical idea of ​​the present invention, the detailed description may be omitted. When "includes," "has," "consists of," etc. are used in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, it may include a case in which the plural is included unless specifically stated otherwise.

[0030] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of the present disclosure. These terms are only intended to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by the terms.

[0031] In a description of the positional relationship of components, when it is described that two or more components are "connected," "combined," or "connected," it should be understood that the two or more components may be directly "connected," "combined," or "connected," but that the two or more components may also be further "interposed" with another component to be "connected," "combined," or "connected." Here, the other component may be included in one or more of the two or more components that are "connected," "combined," or "connected" to each other.

[0032] In the description of the temporal flow relationship related to components, operation methods, or manufacturing methods, for example, when the temporal or flow relationship is described as “after”, “following”, “next to”, “before”, etc., it may also include cases where it is not continuous, unless “immediately” or “directly” is used.

[0033] Meanwhile, when numerical values ​​or corresponding information (e.g., levels, etc.) for components are mentioned, even without separate explicit description, the numerical values ​​or corresponding information may be interpreted as including an error range that may occur due to various factors (e.g., process factors, internal or external impact, noise, etc.).

[0034] The wireless communication system in this specification refers to a system for providing various communication services such as voice, data packets, etc. using wireless resources, and may include a terminal, a base station, or a core network.

[0035] The embodiments disclosed below can be applied to wireless communication systems using various wireless access technologies. For example, the embodiments can be applied to various wireless access technologies such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), or NOMA (non-orthogonal multiple access). In addition, the wireless access technology may not only refer to a specific access technology, but also to each generation of communication technologies established by various communication agreement organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTSterrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink. Thus, the present embodiments can be applied to currently disclosed or commercialized wireless access technologies, as well as wireless access technologies currently under development or to be developed in the future.

[0036] Meanwhile, the term "terminal" in this specification is a comprehensive concept that refers to a device that includes a wireless communication module that performs communication with a base station in a wireless communication system, and should be interpreted as a concept that includes not only UE (User Equipment) in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), but also MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), and wireless device in GSM. In addition, the terminal may be a user portable device such as a smartphone depending on the usage type, and in a V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, etc. In addition, in the case of a Machine Type Communication system, it may mean an MTC terminal, M2M terminal, URLLC terminal, etc. that is equipped with a communication module to perform machine type communication.

[0037] The base station or cell in this specification refers to an end that communicates with a terminal in terms of a network, and includes various coverage areas such as Node-B, eNB (evolved Node-B), gNB (gNode-B), LPN (Low Power Node), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Point (e.g., Transmission Point, Reception Point, Transmission / Reception Point), Relay Node, Mega Cell, Macro Cell, Micro Cell, Pico Cell, Femto Cell, RRH (Remote Radio Head), RU (Radio Unit), and Small Cell. In addition, a cell may mean including a BWP (Bandwidth Part) in the frequency domain. For example, a serving cell may mean an Activation BWP of a terminal.

[0038] Since the various cells listed above have a base station that controls one or more cells, the base station can be interpreted in two meanings. 1) It can be a device itself that provides a mega cell, macro cell, micro cell, pico cell, femto cell, or small cell in relation to a wireless area, or 2) it can indicate the wireless area itself. In 1), all devices that provide a given wireless area are controlled by the same entity or that interact to cooperatively configure the wireless area are all indicated as a base station. Depending on how the wireless area is configured, a point, a transceiver point, a transmission point, a reception point, etc. can be an embodiment of a base station. In 2), the wireless area itself that receives or transmits a signal from the perspective of a user terminal or a neighboring base station can also be indicated as a base station.

[0039] In this specification, a cell may mean a component carrier having coverage of a signal transmitted from a transmission / reception point or a transmission / reception point itself.

[0040] Uplink (UL, or uplink) refers to a method of transmitting and receiving data from a terminal to a base station, and downlink (DL, or downlink) refers to a method of transmitting and receiving data from a base station to a terminal. Downlink may refer to communication or a communication path from multiple transmission / reception points to a terminal, and uplink may refer to communication or a communication path from a terminal to multiple transmission / reception points. In this case, in the downlink, the transmitter may be part of the multiple transmission / reception points, and the receiver may be part of the terminal. In addition, in the uplink, the transmitter may be part of the terminal, and the receiver may be part of the multiple transmission / reception points.

[0041] Uplink and downlink transmit and receive control information through control channels such as PDCCH (Physical Downlink Control CHannel) and PUCCH (Physical Uplink Control CHannel), and transmit and receive data by configuring data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel). Hereinafter, the situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH is also expressed in the form of 'transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH.'

[0042] For clarity of explanation, the technical idea of ​​this invention is described below mainly with reference to the 3GPP LTE / LTE-A / NR (New RAT) communication system, but the technical features of this invention are not limited to the communication system.

[0043] After researching 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of the next-generation wireless access technology of the ITU-R. Specifically, 3GPP develops LTE-A pro, which is an enhancement of LTE-Advanced technology to meet the requirements of the ITU-R, as a 5G communication technology, and NR, a new communication technology separate from 4G communication technology. Both LTE-A pro and NR refer to 5G communication technology, and in the following, 5G communication technology will be explained with NR as the focus, unless a specific communication technology is specified.

[0044] The operating scenario in NR defines various operation scenarios by adding considerations for satellites, automobiles, and new verticals to the existing 4G LTE scenario, and in terms of service, it supports the eMBB (Enhanced Mobile Broadband) scenario, the mMTC (Massive Machine Communication) scenario that has high terminal density but is deployed over a wide area and requires low data rate and asynchronous access, and the URLLC (Ultra Reliability and Low Latency) scenario that requires high responsiveness and reliability and can support high-speed mobility.

[0045] To meet these scenarios, NR introduces a wireless communication system that incorporates new waveform and frame structure technologies, low latency technologies, support for ultra-high frequency bands (mmWave), and forward compatibility technologies. In particular, NR systems offer various technological changes in terms of flexibility to ensure forward compatibility. The key technical features of NR are described below with reference to the drawings.

[0046] <NR 시스템 일반>

[0047] Figure 1 is a schematic diagram illustrating the structure of an NR system to which the present embodiment can be applied.

[0048] Referring to Fig. 1, the NR system is divided into 5GC (5G Core Network) and NR-RAN parts, and the NG-RAN is composed of gNBs and ng-eNBs that provide user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocol termination for UE (User Equipment). gNBs or gNBs and ng-eNBs are interconnected via the Xn interface. gNBs and ng-eNBs are each connected to the 5GC via the NG interface. The 5GC can be configured to include an AMF (Access and Mobility Management Function) that is responsible for the control plane such as terminal access and mobility control functions, and an UPF (User Plane Function) that is responsible for the control function for user data. NR includes support for both frequency bands below 6 GHz (FR1, Frequency Range 1) and frequency bands above 6 GHz (FR2, Frequency Range 2).

[0049] gNB refers to a base station that provides NR user plane and control plane protocol termination to terminals, and ng-eNB refers to a base station that provides E-UTRA user plane and control plane protocol termination to terminals. The base station described in this specification should be understood to encompass both gNB and ng-eNB, and may also be used to refer to gNB or ng-eNB separately as needed.

[0050] <NR 웨이브 폼,뉴머롤러지 및 프레임 구조>

[0051] NR uses the CP-OFDM waveform with a cyclic prefix for downlink transmission, and CP-OFDM or DFT-s-OFDM for uplink transmission. OFDM technology is easily combined with MIMO (Multiple Input Multiple Output) and offers the advantages of high frequency efficiency and low-complexity receivers.

[0052] Meanwhile, in NR, the requirements for data rates, latency, and coverage differ across the three scenarios mentioned above. Therefore, it is necessary to efficiently satisfy these requirements across the frequency bands that comprise any NR system. To this end, technologies have been proposed to efficiently multiplex radio resources based on multiple different numerologies.

[0053] Specifically, the NR transmission numerator is determined based on the sub-carrier spacing and the cyclic prefix (CP), and is changed exponentially using the μ value as an exponent value of 2 based on 15 kHz, as shown in Table 1 below.

[0054] μsubcarrier intervalCyclic prefixSupported for dataSupported for synch015NormalYesYes130NormalYesYes260Normal, ExtendedYesNo3120NormalYesYes4240NormalNoYes

[0055] As shown in Table 1 above, the numerology of NR can be divided into five types according to the subcarrier spacing. This is different from the fixed 15 kHz subcarrier spacing of LTE, one of the 4G communication technologies. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, and 120 kHz, and the subcarrier spacing used for synchronization signal transmission is 15, 30, 120, and 240 kHz. In addition, the extended CP is applied only to the 60 kHz subcarrier spacing. Meanwhile, the frame structure in NR is defined as a 10 ms frame consisting of 10 subframes of the same length of 1 ms. One frame can be divided into 5 ms half frames, and each half frame contains 5 subframes. For a 15 kHz subcarrier spacing, one subframe consists of one slot, and each slot consists of 14 OFDM symbols.

[0056] FIG. 2 is a drawing for explaining a frame structure in an NR system to which the present embodiment can be applied.

[0057] Referring to Fig. 2, a slot is fixedly composed of 14 OFDM symbols in the case of a normal CP, but the length of the slot in the time domain may vary depending on the subcarrier spacing. For example, in the case of a numerology with a 15 kHz subcarrier spacing, a slot is composed of 1 ms in length, which is the same length as a subframe. In contrast, in the case of a numerology with a 30 kHz subcarrier spacing, a slot is composed of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. In other words, subframes and frames are defined with fixed time lengths, while slots are defined by the number of symbols, and their time lengths may vary depending on the subcarrier spacing.

[0058] Meanwhile, NR defines slots as the basic scheduling unit and also introduces mini-slots (or sub-slots, or non-slot-based scheduling) to reduce transmission delay in the wireless section. Using wider subcarrier spacing reduces transmission delay in the wireless section by shortening the length of each slot inversely. Mini-slots (or sub-slots) are designed to efficiently support URLLC scenarios and allow scheduling in units of 2, 4, or 7 symbols.

[0059] Furthermore, unlike LTE, NR defines uplink and downlink resource allocation at the symbol level within a single slot. To reduce HARQ delay, a slot structure was defined that allows HARQ ACK / NACKs to be transmitted directly within the transmission slot. This slot structure is referred to as a self-contained structure and will be described in detail.

[0060] NR is designed to support a total of 256 slot formats, of which 62 are used in 3GPP Rel-15. It also supports a common frame structure that configures FDD or TDD frames through various combinations of slots. For example, it supports a slot structure in which all symbols in a slot are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which downlink and uplink symbols are combined. NR also supports data transmission being distributed and scheduled across one or more slots. Therefore, a base station can use a slot format indicator (SFI) to inform a UE whether a slot is a downlink slot, an uplink slot, or a flexible slot. The base station can indicate the slot format by indicating an index of a table configured through UE-specific RRC signaling using the SFI, and can also indicate it dynamically through DCI (Downlink Control Information) or statically or semi-statically through RRC.

[0061] <NR 물리 자원 >

[0062] In relation to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, and bandwidth parts are considered.

[0063] Antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be quasi co-located (QC / QCL) if the large-scale properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on the other antenna port is carried. Here, the large-scale properties include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0064] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0065] Referring to Figure 3, a resource grid may exist for each numeral, as NR supports multiple numerals on the same carrier. Furthermore, resource grids may exist based on antenna ports, subcarrier spacing, and transmission direction.

[0066] A resource block (RB) consists of 12 subcarriers and is defined solely in the frequency domain. Furthermore, a resource element (RE) consists of one OFDM symbol and one subcarrier. Therefore, as shown in Figure 3, the size of a single RB can vary depending on the subcarrier spacing. NR also defines "Point A," which serves as a common reference point for the RB grid, as well as common RBs and virtual RBs.

[0067] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0068] Unlike LTE, where the carrier bandwidth is fixed at 20 MHz, NR sets the maximum carrier bandwidth from 50 MHz to 400 MHz for each subcarrier interval. Therefore, it is not assumed that all terminals will use the entire carrier bandwidth. Accordingly, NR allows terminals to designate bandwidth parts (BWPs) within the carrier bandwidth, as illustrated in Figure 4. Furthermore, bandwidth parts are associated with a single numerology, consist of a subset of consecutive common resource blocks, and can be dynamically activated over time. Each terminal is configured with up to four bandwidth parts for both the uplink and downlink, and data is transmitted and received using the bandwidth parts activated at a given time.

[0069] In the case of a paired spectrum, the uplink and downlink bandwidth parts are set independently, and in the case of an unpaired spectrum, the downlink and uplink bandwidth parts are set in pairs so that they can share a center frequency to prevent unnecessary frequency re-tuning between downlink and uplink operations.

[0070] <NR 초기 접속>

[0071] In NR, a terminal performs cell search and random access procedures to connect to a base station and perform communication.

[0072] Cell search is a procedure in which a terminal synchronizes to the cell of a corresponding base station, obtains a physical layer cell ID, and obtains system information using a synchronization signal block (SSB) transmitted by the base station.

[0073] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0074] Referring to FIG. 5, SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), each occupying 1 symbol and 127 subcarriers, and a PBCH spanning 3 OFDM symbols and 240 subcarriers.

[0075] The terminal receives SSB by monitoring SSB in the time and frequency domain.

[0076] SSB can be transmitted up to 64 times in 5ms. Multiple SSBs are transmitted in different transmission beams within 5ms, and the terminal performs detection assuming that SSBs are transmitted every 20ms based on a specific beam used for transmission. The number of beams that can be used for SSB transmission within 5ms can increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted below 3GHz, up to 8 in the frequency band between 3GHz and 6GHz, and up to 64 different beams can be used for SSB transmission in the frequency band above 6GHz.

[0077] SSB contains two symbols in one slot, and the starting symbol and number of repetitions within the slot are determined as follows depending on the subcarrier spacing.

[0078] Meanwhile, unlike SS in conventional LTE, SSB is not transmitted at the center frequency of the carrier bandwidth. This means that SSB can be transmitted even in locations other than the center of the system bandwidth, and when supporting wideband operation, multiple SSBs can be transmitted in the frequency domain. Accordingly, the terminal monitors SSB using the synchronization raster, which is a candidate frequency location for monitoring SSB. The carrier raster, which is the center frequency location information of the channel for initial access, and the synchronization raster are newly defined in NR. The synchronization raster has a wider frequency interval than the carrier raster, which can support the terminal's fast SSB search.

[0079] A UE can obtain the MIB through the PBCH of the SSB. The MIB (Master Information Block) includes the minimum information required for the UE to receive the remaining system information (RMSI, Remaining Minimum System Information) broadcast by the network. In addition, the PBCH may include information on the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (e.g., SIB1 numerology information, information related to SIB1 CORESET, search space information, PDCCH-related parameter information, etc.), offset information between the common resource block and the SSB (the absolute position of the SSB within the carrier is transmitted through SIB1), etc. Here, the SIB1 numerology information is also applied equally to some messages used in the random access procedure for the UE to access the base station after completing the cell search procedure. For example, the numerology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.

[0080] The aforementioned RMSI may refer to SIB1 (System Information Block 1), and SIB1 is broadcast periodically (e.g., every 160 ms) in the cell. SIB1 contains information necessary for the UE to perform the initial random access procedure and is periodically transmitted via PDSCH. In order for the UE to receive SIB1, it must receive numerology information used for SIB1 transmission and CORESET (Control Resource Set) information used for SIB1 scheduling via PBCH. The UE checks scheduling information for SIB1 using SI-RNTI in CORESET and acquires SIB1 on PDSCH according to the scheduling information. The remaining SIBs, excluding SIB1, may be transmitted periodically or upon request of the UE.

[0081] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0082] Referring to FIG. 6, once cell search is complete, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted via the PRACH. Specifically, the random access preamble is transmitted to the base station via the PRACH, which consists of consecutive radio resources in a specific slot that is periodically repeated. Generally, when a terminal initially accesses a cell, a contention-based random access procedure is performed, and when performing random access for beam failure recovery (BFR), a non-contention-based random access procedure is performed.

[0083] The terminal receives a random access response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), an UL Grant (uplink radio resource), a temporary C-RNTI (Temporary Cell - Radio Network Temporary Identifier), and a TAC (Time Alignment Command). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to indicate which terminal the included UL Grant, temporary C-RNTI, and TAC are valid for. The random access preamble identifier may be an identifier for the random access preamble received by the base station. The TAC may be included as information for the terminal to adjust uplink synchronization. The random access response may be indicated by a random access identifier on the PDCCH, i.e., an RA-RNTI (Random Access - Radio Network Temporary Identifier).

[0084] Upon receiving a valid random access response, the terminal processes the information contained in the random access response and performs scheduled transmission to the base station. For example, the terminal applies TAC and stores a temporary C-RNTI. Furthermore, using the UL Grant, the terminal transmits data stored in its buffer or newly generated data to the base station. In this case, information that identifies the terminal must be included.

[0085] Finally, the terminal receives a downlink message for contention resolution.

[0086] <NR CORESET>

[0087] The downlink control channel in NR is transmitted in a CORESET (Control Resource Set) with a length of 1 to 3 symbols, and transmits uplink / downlink scheduling information, SFI (Slot format Index), and TPC (Transmit Power Control) information.

[0088] To ensure system flexibility, NR introduced the CORESET concept. CORESET (Control Resource Set) refers to time-frequency resources for downlink control signals. A terminal can decode control channel candidates using one or more search spaces within the CORESET time-frequency resources. A QCL (Quasi CoLocation) assumption is established for each CORESET, which is used to inform the characteristics of analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay assumed by the conventional QCL.

[0089] Figure 7 is a drawing for explaining CORESET.

[0090] Referring to Figure 7, a CORESET can exist in various forms within the carrier bandwidth within a single slot, and in the time domain, a CORESET can consist of up to three OFDM symbols. In addition, a CORESET is defined as a multiple of six resource blocks up to the carrier bandwidth in the frequency domain.

[0091] The first CORESET is indicated via the MIB as part of the initial bandwidth part configuration, allowing the terminal to receive additional configuration and system information from the network. After establishing a connection with the base station, the terminal can receive and configure one or more CORESET information via RRC signaling.

[0092] In this specification, the terms frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals or various messages related to NR (New Radio) may be interpreted in the past or present meaning or in various meanings used in the future.

[0093] The present disclosure relates to a technology for efficiently receiving a paging message after waking up when an idle mode (Idle / Inactive state) terminal that seeks to minimize power consumption by using a low-power wake-up receiver (WUR) receives a wake-up signal (WUS) through the WUR.

[0094] In this specification, a low-power wake-up receiver (WUR) refers to a device configured to receive only a wake-up signal using physically low power, unlike a conventional transceiver configured within a terminal. A low-power wake-up receiver (WUR) may be replaced with various terms, and may also be described as a low-power receiver, LP-WUR, LP, etc. In other words, a device / chip / circuit, etc. configured to use low power, distinct from a conventional transceiver within a terminal, may refer to the same device as a low-power receiver or LP-WUR of the present disclosure, regardless of the terminology.

[0095] In mobile communication systems, DRX operation is performed to reduce terminal power consumption. However, DRX applied to NR requires long sleep durations to minimize terminal power consumption. Long-duration DRX operation provides a way to minimize terminal power consumption. However, it has been difficult to satisfy the delay requirements for terminals demanding low latency.

[0096] To address these issues, a technology is required that enables receiving wake-up signals from base stations while consuming minimal power even in short cycles or always-ON states to support terminals that require both low latency and low power.

[0097] For example, an ultra-low-power receiver that can be installed separately from a transceiver installed in a conventional terminal can be configured in the terminal. For example, the receiver is defined as a receiver that can receive only a wake-up signal and essential signals related thereto, and is separate from the transceiver used for conventional data transmission and reception. When the terminal enters deep sleep mode or low power WUR mode, the transceiver (Main Radio, MR tx. / rx. module) used to transmit and receive conventional NR signals / channels is turned off, and only the LP wake-up receiver is turned on so that only the wake-up signal and essential signals related thereto can be received. Through this, the power consumption of the terminal can be drastically reduced.

[0098] At this time, a terminal that receives a wake-up signal through the corresponding receiver (LR, Low Power Wakeup Receiver) may be instructed to switch to main radio (MR) mode. The terminal that has been instructed to switch the mode can switch from LR to MR and perform communication through the transceiver for existing NR data transmission and reception.

[0099] To this end, not only the design and reception method of the WUS (Wake-Up Signal), which is a method for switching from LR mode to MR mode, but also detailed technology is required for the method for switching from MR to LR mode and the issues related to the relationship between the power saving method of MR and LR.

[0100] Terminals operating in LP-WUR (LR) mode are defined separately from those operating in conventional NR transceiver modes. In LR mode, specific terminal operation descriptions are required.

[0101] For terminals with LR capability, downlink monitoring can be performed while minimizing power consumption through a low power receiver (LP-WUR) in both connected and idle / inactive states. In addition, a terminal in a conventional idle or inactive state calculates its own paging occasion (PO) according to the paging DRX cycle, then wakes up once within the paging DRX cycle and periodically checks for the presence of a paging message including its UE ID. However, for a terminal in LR mode, the paging message transmitted to the MR will be decoded only when an LP-WUS is received in LR.

[0102] In conventional MR, paging messages are configured to specify a period (PO) during which the UE must monitor the PDCCH based on the configured DRX cycle. To this end, the UE obtains DRX cycle information through the SIB received from the base station, calculates the PO it must monitor, and then decodes the paging message scrambled with P-RNTI and transmitted during the corresponding period to determine whether its own ID exists.

[0103] FIG. 8 is a diagram for explaining a paging message reception operation in a paging occasion according to a conventional DRX cycle.

[0104] Referring to FIG. 8, if WUS is applied to the MR transceiver to minimize power consumption of a conventional idle UE, the WUS can be set to be transmitted in advance through the PDCCH before the PO (810) at the same cycle as the paging DRX cycle. The UE monitors the WUS, and decodes the PDCCH to receive a corresponding paging message only when the WUS is received. In this case, since only the power consumed for PDCCH decoding can be saved, it is not very helpful in power saving. In other words, when monitoring the wake-up signal (WUS) in the MR, there is a problem that the function of preventing power consumption of the UE to the level of UE consumption saving according to the WUS cycle setting is weak when a paging message is received from the conventional PO.

[0105] FIG. 9 is a diagram for explaining a paging message reception operation in a paging occasion based on a wake-up signal according to one embodiment.

[0106] Referring to FIG. 9, a case in which WUS is received through a low-power receiver (LP-WUR or LR) for LR mode can be considered. In the LR mode, WUS can be monitored at a shorter cycle than always ON or paging through the low-power receiver. In this case, the terminal can quickly receive DL data occurrence through WUS on LR. However, if the same paging DRX as the conventional one is applied as a paging monitoring method in MR according to WUS reception, the reception of the paging message must be monitored at the PO (810), which is the same as the PO in FIG. 8. This has a problem in that a delay in the reception of the paging message may occur depending on the timing of the WUS reception due to the long cycle for paging transmission. That is, if the WUS is received just before or a short time before the PO (810), the paging message can be received at the PO immediately, but if the PO (810) is far away from the WUS for a long time, a delay occurs until the paging message is confirmed even if the mode is switched to MR.

[0107] To solve these problems, we propose a method to quickly receive paging messages in MR mode by receiving WUS through the LR (low power receiver) of an RRC idle / inactive terminal.

[0108] Figure 10 is a flowchart for explaining terminal operation according to one embodiment.

[0109] Referring to FIG. 10, a method for a terminal to receive a paging message may include a step of receiving a wake-up signal (WUS) from a base station through a low-power receiver (S1010).

[0110] For example, a terminal may configure a low-power receiver for receiving a wake-up signal separately from a conventional transceiver (e.g., MR) for transmission and reception. The terminal may receive a wake-up signal transmitted by a base station through the low-power receiver.

[0111] For example, the terminal may receive the wake-up signal in the RRC IDLE or RRC Inactive state. Alternatively, the terminal may receive the wake-up signal using a low-power receiver in a mode that is set to power off the terminal's conventional transceiver.

[0112] The low-power receiver is distinct from the receiver that monitors paging messages and can be configured to receive wake-up signals. That is, the low-power receiver only receives signals to wake up the terminal and performs operations related to receiving the wake-up signal. Paging message monitoring can be handled by the MR, which provides conventional mobile communication services, rather than the low-power receiver.

[0113] A terminal that receives a wake-up signal can transition the mode of the MR to monitor the paging message from the MR.

[0114] A method for a terminal to receive a paging message may include a step of monitoring a paging message in a dynamic paging occasion set based on a wake-up signal (S1020).

[0115] For example, a terminal can monitor paging messages on a dynamic paging occasion via MR when a wake-up signal is received. The dynamic paging occasion can be configured separately from the legacy paging occasion.

[0116] For example, a dynamic paging order is determined based on configuration information for setting an operation associated with a low-power receiver, and can be set separately from a paging order set according to a DRX (Discontinuous Reception) operation.

[0117] For example, dynamic paging orders can be configured based on configuration information received via upper-layer messages. The configuration information can include information for configuring low-power receiver operation on the terminal.

[0118] As another example, dynamic paging orders may be configured based on configuration information received via system information. The configuration information may include information for configuring low-power receiver operation on the terminal.

[0119] As another example, dynamic page occassion may be set based on configuration information pre-configured in the terminal.

[0120] As described above, the dynamic paging occasion can be set separately from the paging occasion set for monitoring paging messages according to the DRX operation of the conventional terminal.

[0121] Meanwhile, a dynamic paging occasion can be configured to arrive earlier in time than the first paging occasion that arrives after receiving a wake-up signal. For example, a dynamic paging occasion can be configured to be linked to the time of reception (or transmission) of the wake-up signal. This allows for faster monitoring of paging messages compared to legacy paging occasions.

[0122] For example, a dynamic paging occasion can be set to start after X slots, linked to the time of reception of a wake-up signal, where X is an integer greater than or equal to 1. That is, the dynamic paging occasion can be dynamically determined, linked to the time of reception of a wake-up signal. Information about X slots can be included in the aforementioned configuration information.

[0123] As another example, a dynamic paging order may consist of N consecutive time slots, where N is an integer greater than or equal to 1. That is, the dynamic paging order consists of one or more consecutive slots, where N may also be included in the aforementioned configuration information.

[0124] Terminals can determine the starting point and duration of a dynamic paging event through configuration information. Therefore, dynamic paging events enable faster monitoring of paging messages, even when there is a wide time interval between the wake-up signal and the legacy paging event.

[0125] Fig. 11 is a flowchart for explaining base station operation according to another embodiment.

[0126] Referring to FIG. 11, a method for a base station to transmit a paging message may include a step of transmitting a wake-up signal (WUS) received through a low-power receiver configured in a terminal (S1110).

[0127] For example, a terminal may configure a low-power receiver for receiving a wake-up signal separately from a conventional transceiver (e.g., MR) for transmission and reception. The base station may transmit the wake-up signal to the terminal via the low-power receiver.

[0128] The low-power receiver is distinct from the receiver that monitors paging messages and can be configured to receive wake-up signals. In other words, the low-power receiver only receives signals to wake up the terminal and performs operations related to receiving the wake-up signal. Paging message monitoring can be handled by the MR of the terminal, which provides conventional mobile communication services, rather than by the low-power receiver.

[0129] A method for a base station to transmit a paging message may include a step of controlling transmission of a paging message to a terminal in a dynamic paging occasion set based on a wake-up signal (S1120).

[0130] For example, a base station can transmit a paging message to a given terminal in a dynamic paging order. The dynamic paging order can be configured separately from the legacy paging order.

[0131] For example, a dynamic paging order is determined based on configuration information for setting an operation associated with a low-power receiver, and can be set separately from a paging order set according to a DRX (Discontinuous Reception) operation.

[0132] For example, dynamic paging ordering can be configured based on configuration information transmitted to the terminal via a higher-layer message. The configuration information can include information for configuring low-power receiver operation on the terminal.

[0133] As another example, dynamic paging orders may be configured based on configuration information broadcast via system information. The configuration information may include information for configuring low-power receiver operation on the terminal.

[0134] As another example, dynamic page occassion may be set based on configuration information pre-configured in the terminal.

[0135] The base station may transmit terminal-specific upper layer messages or system information to transmit the aforementioned configuration information.

[0136] As described above, the dynamic paging occasion can be set separately from the paging occasion set for monitoring paging messages according to the DRX operation of the conventional terminal.

[0137] Meanwhile, a dynamic paging occasion can be configured to arrive earlier in time than the first paging occasion that arrives after the wake-up signal is transmitted. For example, a dynamic paging occasion can be configured to be linked to the time of transmission (or terminal reception) of the wake-up signal. This allows for faster monitoring of paging messages compared to legacy paging occasions.

[0138] For example, a dynamic paging occasion can be set to start after X slots linked to the reception time when the terminal receives a wake-up signal, where X is an integer greater than or equal to 1. That is, the dynamic paging occasion can be dynamically determined linked to the reception time of the wake-up signal. Information about X slots can be included in the aforementioned configuration information.

[0139] As another example, a dynamic paging order may consist of N consecutive time slots, where N is an integer greater than or equal to 1. That is, the dynamic paging order consists of one or more consecutive slots, where N may also be included in the aforementioned configuration information.

[0140] The base station can use configuration information to inform the terminal of the start point and duration of a dynamic paging order. Therefore, even when there is a wide time interval between the wake-up signal and the legacy paging order, the terminal can monitor paging messages more quickly through dynamic paging order.

[0141] Below, we describe various embodiments that can be performed by the aforementioned terminals and base stations. Each embodiment or implementation configuration described below can be performed by the terminals and base stations individually or in any combination.

[0142] In this specification, LR mode refers to a state in which the main transceiver (MR) is turned off or monitoring operations via the MR are minimized to ensure low-power operation of the terminal. LR mode may also refer to a state in which the terminal can receive a wake-up signal via the LR.

[0143] As described above, the present embodiments propose a paging message reception method using a low power receiver (LR), which is one of the new power saving technologies for minimizing both downlink data reception delay and power consumption of a terminal.

[0144] For example, an idle or inactive terminal can receive LP-WUS through an ultra-low power receiver in LR mode, switch to MR mode, and monitor PDCCH for continuous N slot(s) (where N is an integer greater than 1). At this time, the paging message can be decoded using P-RNTI, or transmitted as a separate message from the paging message transmitted with the conventional P-RNTI through a newly defined paging RNTI for LR terminals.

[0145] Here, the base station can transmit PDCCH section (PO) information that the terminal must monitor after switching to MR mode through a message containing LR-related configuration information (e.g., UE-specific RRC message or SIB or LR-SIB).

[0146] The paging occasion (PO) proposed in these embodiments may mean a time resource section that is dynamically defined in relation to the LP-WUS reception time, unlike the PO defined once per DRX cycle in the prior art. That is, the PO may be defined as N consecutive time slot(s) in which the paging DCI of the terminal that received the LP-WUS can be transmitted. In addition, the starting point of the PO for the LR terminal may be defined as X slots after the LP-WUS reception time. Here, X may be an integer value greater than 0 or 1. Hereinafter, the PO that is dynamically defined in relation to the aforementioned LP-WUS reception time is described as a Dynamic PO (DPO) for convenience of explanation, but this may be replaced with another name.

[0147] Below, an embodiment according to terminal operation is described.

[0148] A terminal with LR functionality can receive DPO configuration information from a base station via LR-related system information or configuration information. This can have different values ​​for each cell. If cell information transmitted in LR mode is defined to enable idle / inactive UEs to perform cell reselection, the corresponding DPO information can also be included in the cell information. Alternatively, if it is decided to use the same DPO for all cells, this can be preset as a fixed value within the specification.

[0149] A terminal that enters LR mode obtains DPO information of the cell it has camped on through the above cell information and monitors LP-WUS transmitted to it. If a terminal in an idle or inactive state operates in always ON LR mode, the terminal will always keep the low-power receiver on and monitor LP-WUS that can be transmitted on the downlink. At this time, the terminal continuously checks whether the LP-WUS allocated to it is transmitted. Alternatively, the terminal may be configured to periodically monitor LP-WUS. The LP-WUS cycle may have a shorter period than the conventional DRX cycle.

[0150] In LR mode, a terminal that receives an LP-WUS through a low-power receiver attempts to receive a paging message by switching to MR. For example, after receiving an LP-WUS, the terminal can turn on the MR power and monitor the paging DCI for time slot(s) equal to DPO from the first slot of the MR. DPO is a value indicating the number of slots in which the terminal should attempt to receive a paging message with a paging-related RNTI, and can be expressed as N (an integer greater than 1). This assumes that the downlink synchronization and cell information acquired in LR mode can be applied as is in MR mode.

[0151] FIG. 12 is a diagram for explaining a paging message monitoring operation in a dynamic paging occasion based on a wake-up signal according to one embodiment.

[0152] Referring to Fig. 12, when a terminal receives an LP-WUS transmitted to itself, it switches to MR mode. At this time, the received LP-WUS can generally use the UE-group ID. After the terminal turns on the MR transceiver to receive the LP-WUS, it monitors the paging DCI that can be transmitted during the time corresponding to the DPO. When the terminal receives the paging DCI, it checks whether its terminal ID exists through paging message decoding. At this time, if its terminal ID exists in the paging message, the terminal switches to the connected state and can perform data transmission and reception through the MR.

[0153] FIG. 13 is a diagram for explaining a paging message monitoring operation in a dynamic paging occasion based on a wake-up signal according to another embodiment.

[0154] Referring to FIG. 13, when a terminal receives an LP-WUS transmitted to itself, it switches to MR mode. At this time, the received LP-WUS can generally use the UE-group ID. The terminal turns on the MR transceiver to receive the LP-WUS and then monitors the paging DCI that can be transmitted during the time corresponding to the DPO. When the terminal receives the paging DCI, it checks whether its terminal ID exists through paging message decoding. At this time, if the terminal has checked all paging messages transmitted during the set DPO but its terminal ID does not exist, it turns off the MR power after the set DPO and switches to LR mode. In the case of FIG. 12 and FIG. 13, the case of DPO = 2 slots is shown as an example, and this embodiment is about a case where the terminal checks for a paging message that can be transmitted on two consecutive slots from the first slot received immediately after switching to MR mode. As mentioned above, the starting point and duration of DPO can be set in various ways depending on the configuration information.

[0155] FIG. 14 is a diagram for explaining a paging message monitoring operation in a dynamic paging occasion based on a wake-up signal according to another embodiment.

[0156] Referring to FIG. 14, as an example, the starting point of the DPO may be the first receivable slot as soon as the MR is turned ON after receiving the LP-WUS. As another example, the starting point of the DPO may be a slot after a certain number of slots have passed since the MR is turned ON after receiving the LP-WUS. For example, if DL synchronization (SSB reception) and system information reception for the MR are additionally required before receiving a paging message through the MR, the PDCCH of the first slot after the time information (X slots, 1400) required to receive the SSB and SIB may be set as the starting point of the DPO. In this case, the base station may additionally include a setting for the X value (1400) in the message setting the DPO value.

[0157] Additionally, the starting point of DPO can be set after the X slot regardless of system information or SSB reception. This can be set by the base station considering the mode transition time of the terminal, etc.

[0158] In the present embodiments, as an example, a paging message that a terminal that has received a group-based LP-WUS attempts to decode may utilize a conventional paging-related RNTI. In this case, the base station may optionally include the UEID of a terminal with LR functionality in the paging message transmitted for a terminal without a conventional LR receiver functionality. That is, even if the terminal does not belong to a group according to the DRX cycle, the base station may include the UEID of the terminal that triggered the LP-WUS in the paging message transmitted to the DPO of the corresponding UE.

[0159] As another example, a new RNTI (DynamicPaging-RNTI, DP-RNTI) can be defined for LR terminals to transmit distinct paging messages only to those terminals. In this case, this means that paging messages for terminals that received LP-WUS in the same time resource of LR can be transmitted within the same DPO of MR. Terminals that received LP-WUS monitor the paging messages transmitted with DP-RNTI within the DPO.

[0160] More specifically, the operation of the terminal and base station according to the present embodiment will be described with reference to the drawings, distinguishing between LR and MR within the terminal.

[0161] FIG. 15 is a signal diagram for explaining terminal and base station operations based on a wake-up signal according to one embodiment. FIG. 16 is a signal diagram for explaining terminal and base station operations based on a wake-up signal according to another embodiment.

[0162] Referring to FIGS. 15 and 16, the terminal and the base station can perform the following operations.

[0163] [Terminal operation]

[0164] 1. The terminal receives LR-related configuration information from the base station. The message may include at least the following information:

[0165] A. Dynamic paging occasion information (N): At least one of information on N consecutive time slot(s) in which the paging DCI of the terminal receiving the LP-WUS can be transmitted and information on the starting point of the DPO defined in relation to the time of reception of the LP-WUS.

[0166] 2. The terminal enters IDLE LR mode based on base station instructions or related settings.

[0167] 3. The terminal performs at least one of the following actions in IDLE LR mode:

[0168] A. Perform RRM measurement

[0169] B. LP-WUS monitoring

[0170] 4. If the terminal receives LP-WUS, it switches to MR mode.

[0171] A. Includes the action of turning ON MR power.

[0172] 5. Monitor paging messages transmitted from MR's DPO.

[0173] A. After receiving LP-WUS, monitor DCI transmitted with paging RNTI for N slots starting from the first slot of MR (or after X slots).

[0174] B. If the paging message received as in Fig. 15 includes the UE ID of the terminal, RRC connection setup is initiated for data transmission and reception in MR mode.

[0175] C. If the paging message received as in Fig. 16 does not include the UE ID of the terminal, after DPO, MR power is turned off and LR mode is entered.

[0176] [Base station operation]

[0177] 1. The base station transmits LR-related configuration information. This message may include the following information:

[0178] A. Dynamic paging occasion information (N): At least one of information about N consecutive time slot(s) in which the paging DCI of the terminal receiving the LP-WUS can be transmitted and information about the starting point of the DPO defined in relation to the time of reception of the LP-WUS. The starting point of the DPO is defined as X slots after the MR based on the time of reception of the LP-WUS. Here, X is an integer value greater than 1.

[0179] 2. The base station recognizes that the terminal has entered IDLE LR mode.

[0180] 3. The base station that receives a paging message from the network to wake up the terminal transmits LP-WUS to the IDLE LR mode terminal.

[0181] 4. The base station transmits a paging message including the UEID of the terminal in the DPO of the MR calculated based on the transmission time of the LP-WUS.

[0182] As described above, according to the present disclosure, a terminal seeking to minimize power consumption can monitor downlink signals using a low-power receiver separate from the main radio transceiver, such as NR. This has the effect of minimizing the delay required for the terminal state transition from idle / inactive to connected by allowing the idle mode terminal to quickly confirm the paging message after receiving the WUS.

[0183] Below, the configuration of a terminal and a base station capable of performing all or any combination of the above-described embodiments is described again.

[0184] Fig. 17 is a drawing for explaining a terminal configuration according to one embodiment.

[0185] Referring to FIG. 17, a terminal (1700) receiving a paging message may include a receiving unit (1730) that receives a wake-up signal (WUS) from a base station through a low-power receiver, and a control unit (1710) that monitors a paging message in a dynamic paging occasion set based on the wake-up signal.

[0186] For example, the terminal (1700) may configure a low-power receiver for receiving a wake-up signal separately from a transceiver (e.g., MR) for conventional transmission and reception. The receiving unit (1730) may receive a wake-up signal transmitted by the base station through the low-power receiver.

[0187] For example, the receiver (1730) may receive a wake-up signal in an RRC IDLE or RRC Inactive state. Alternatively, the receiver (1730) may receive a wake-up signal using a low-power receiver in a mode that is set to turn off the power of the conventional transceiver of the terminal (1700).

[0188] The low-power receiver is distinct from the receiver that monitors paging messages and can be configured to receive wake-up signals. That is, the low-power receiver only receives signals to wake up the terminal and performs operations related to receiving the wake-up signal. Paging message monitoring can be handled by the MR, which provides conventional mobile communication services, rather than the low-power receiver.

[0189] When the control unit (1710) receives a wake-up signal, it can transition the mode of the MR so that the terminal monitors the paging message from the MR.

[0190] Additionally, the control unit (1710) can monitor paging messages on a dynamic paging occasion via MR when a wake-up signal is received. The dynamic paging occasion can be set separately from the legacy paging occasion.

[0191] For example, a dynamic paging order is determined based on configuration information for setting an operation associated with a low-power receiver, and can be set separately from a paging order set according to a DRX (Discontinuous Reception) operation.

[0192] For example, a dynamic paging order can be set based on configuration information received via a higher layer message. The configuration information can include information for configuring a low-power receiver operation in a terminal. As another example, a dynamic paging order can be set based on configuration information received via system information. The configuration information can include information for configuring a low-power receiver operation in a terminal. As another example, a dynamic page order can be set based on configuration information pre-configured in a terminal. As described above, a dynamic paging order can be set separately from a paging order that is set for monitoring paging messages based on a DRX operation of a conventional terminal.

[0193] Meanwhile, a dynamic paging occasion can be configured to arrive earlier in time than the first paging occasion that arrives after receiving a wake-up signal. For example, a dynamic paging occasion can be configured to be linked to the time of reception (or transmission) of the wake-up signal. This allows for faster monitoring of paging messages compared to legacy paging occasions.

[0194] For example, a dynamic paging occasion can be set to start after X slots, linked to the time of reception of a wake-up signal, where X is an integer greater than or equal to 1. That is, the dynamic paging occasion can be dynamically determined, linked to the time of reception of a wake-up signal. Information about X slots can be included in the aforementioned configuration information.

[0195] As another example, a dynamic paging order may consist of N consecutive time slots, where N is an integer greater than or equal to 1. That is, the dynamic paging order consists of one or more consecutive slots, where N may also be included in the aforementioned configuration information.

[0196] The control unit (1710) can determine the starting point and duration of a dynamic paging occasion through configuration information. Therefore, even when the time interval between a wake-up signal and a legacy paging occasion is wide, paging message monitoring is possible more quickly through the dynamic paging occasion.

[0197] In addition, the control unit (1710) controls the overall operation of the terminal (1700) according to the terminal's paging message reception operation required to perform the aforementioned disclosure.

[0198] The transmitter (1720) and receiver (1730) are used to transmit and receive signals, messages, and data necessary for carrying out the present invention described above with the base station.

[0199] Fig. 18 is a drawing for explaining a base station configuration according to one embodiment.

[0200] Referring to FIG. 18, a base station (1800) that transmits a paging message may include a transmitter (1820) that transmits a wake-up signal (WUS) received through a low-power receiver configured in a terminal, and a control unit (1810) that controls transmission of a paging message to a terminal in a dynamic paging occasion set based on the wake-up signal.

[0201] For example, the transmitter (1820) can transmit a wake-up signal to the terminal through a low-power receiver.

[0202] The low-power receiver is distinct from the receiver that monitors paging messages and can be configured to receive wake-up signals. In other words, the low-power receiver only receives signals to wake up the terminal and performs operations related to receiving the wake-up signal. Paging message monitoring can be handled by the MR of the terminal, which provides conventional mobile communication services, rather than by the low-power receiver.

[0203] Meanwhile, the transmitter (1820) can transmit a paging message to the corresponding terminal in a dynamic paging order. The dynamic paging order can be configured separately from the legacy paging order.

[0204] For example, a dynamic paging order is determined based on configuration information for setting an operation associated with a low-power receiver, and can be set separately from a paging order set according to a DRX (Discontinuous Reception) operation.

[0205] For example, a dynamic paging order may be configured based on configuration information transmitted to the terminal via a higher-layer message. The configuration information may include information for configuring low-power receiver operation on the terminal. As another example, a dynamic paging order may be configured based on configuration information broadcast via system information. The configuration information may include information for configuring low-power receiver operation on the terminal. As another example, a dynamic page order may be configured based on configuration information pre-configured on the terminal.

[0206] Additionally, the transmitter (1820) can transmit a terminal-specific upper layer message or system information to transmit the aforementioned setting information.

[0207] As described above, the dynamic paging occasion can be set separately from the paging occasion set for monitoring paging messages according to the DRX operation of the conventional terminal.

[0208] Meanwhile, a dynamic paging occasion can be configured to arrive earlier in time than the first paging occasion that arrives after the wake-up signal is transmitted. For example, a dynamic paging occasion can be configured to be linked to the time of transmission (or terminal reception) of the wake-up signal. This allows for faster monitoring of paging messages compared to legacy paging occasions.

[0209] For example, a dynamic paging occasion can be set to start after X slots linked to the reception time when the terminal receives a wake-up signal, where X is an integer greater than or equal to 1. That is, the dynamic paging occasion can be dynamically determined linked to the reception time of the wake-up signal. Information about X slots can be included in the aforementioned configuration information.

[0210] As another example, a dynamic paging order may consist of N consecutive time slots, where N is an integer greater than or equal to 1. That is, the dynamic paging order consists of one or more consecutive slots, where N may also be included in the aforementioned configuration information.

[0211] The transmitter (1820) can inform the terminal of the starting point and duration of a dynamic paging occasion through configuration information. Therefore, even when the time interval between the wake-up signal and the legacy paging occasion is wide, the terminal can monitor paging messages more quickly through the dynamic paging occasion.

[0212] In addition, the control unit (1810) controls the overall operation of the base station (1800) according to the paging message transmission operation of the terminal required to perform the aforementioned disclosure.

[0213] The transmitter (1820) and receiver (1830) are used to transmit and receive signals, messages, and data necessary for carrying out the present invention described above with terminals and core network entities.

[0214] The above-described embodiments may be supported by standard documents disclosed in at least one of the wireless access systems, IEEE 802, 3GPP, and 3GPP2. That is, steps, components, and parts not described in the present embodiments to clearly illustrate the technical concepts herein may be supported by the above-described standard documents. Furthermore, all terms disclosed in this specification may be explained by the above-described standard documents.

[0215] The embodiments described above may be implemented through various means. For example, the embodiments may be implemented through hardware, firmware, software, or a combination thereof.

[0216] In the case of hardware implementation, the method according to the present embodiments may be implemented by one or more ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, or microprocessors.

[0217] When implemented using firmware or software, the methods according to the present embodiments may be implemented in the form of devices, procedures, or functions that perform the functions or operations described above. The software code may be stored in a memory unit and executed by a processor. The memory unit may be located within or outside the processor and may exchange data with the processor using various known means.

[0218] Additionally, terms such as "system," "processor," "controller," "component," "module," "interface," "model," or "unit" as described above may generally refer to a computer-related entity, such as hardware, a combination of hardware and software, software, or software in execution. For example, the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, a thread of execution, a program, and / or a computer. For example, both an application running on a controller or a processor and the controller or the processor may be components. One or more components may be within a process and / or thread of execution, and the components may be located on a single device (e.g., a system, a computing device, etc.) or distributed across two or more devices.

[0219] The above description is merely an illustrative example of the technical idea of ​​the present disclosure, and those skilled in the art to which the present disclosure pertains will appreciate that various modifications and variations can be made without departing from the essential characteristics of the technical idea of ​​the present disclosure. In addition, the present embodiments are not intended to limit the technical idea of ​​the present disclosure but rather to explain it, and therefore the scope of the technical idea of ​​the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included within the scope of the rights of the present disclosure.

[0220]

[0221] CROSS-REFERENCE TO RELATED APPLICATION

[0222] This patent application claims priority under 35 USC §119(a) to Korean Patent Application No. 10-2023-0092730, filed in Korea on July 17, 2023, and Korean Patent Application No. 10-2024-0091142, filed in Korea on July 10, 2024, the entire contents of which are incorporated herein by reference. In addition, this patent application claims priority in countries other than the United States for the same reasons, the entire contents of which are incorporated herein by reference.

Claims

1. In the method for a terminal to receive a paging message, A step of receiving a wake-up signal (WUS) from a base station through a low-power receiver; and A method comprising the step of monitoring a paging message in a dynamic paging occasion set based on the wake-up signal.

2. In paragraph 1, The above low power receiver, A method characterized in that it is configured to receive the wake-up signal and is distinguished from a receiver that monitors the paging message.

3. In paragraph 1, The above dynamic paging occasion is, A method for setting an operation linked to the above low-power receiver based on configuration information, and set separately from a paging occasion set according to a DRX (Discontinuous Reception) operation.

4. In paragraph 3, The above dynamic paging occasion is, A method characterized in that the paging occasion that arrives first after receiving the wake-up signal is set to arrive earlier on the time axis.

5. In paragraph 1, The above dynamic paging occasion is, A method characterized in that it is set to start after X slots linked to the time of receiving the wake-up signal, wherein X is an integer greater than or equal to 1.

6. In paragraph 1, The above dynamic paging occasion is, A method characterized in that it consists of N consecutive time slots, wherein N is an integer greater than or equal to 1.

7. In the method of transmitting a paging message by a base station, A step of transmitting a wake-up signal (WUS) received through a low-power receiver configured in a terminal; and A method comprising a step of controlling a paging message to be transmitted to the terminal in a dynamic paging occasion set based on the wake-up signal.

8. In paragraph 7, The above dynamic paging occasion is, A method for setting an operation linked to the low-power receiver based on configuration information, and set separately from a paging occasion set according to the DRX (Discontinuous Reception) operation of the terminal.

9. In paragraph 8, The above dynamic paging occasion is, A method characterized in that the paging occasion that arrives first after the wake-up signal transmission is set to arrive earlier on the time axis.

10. In paragraph 7, The above dynamic paging occasion is, A method characterized in that the wake-up signal is set to start after X slots at a reception time when the terminal receives the wake-up signal, and X is an integer greater than or equal to 1.

11. In paragraph 7, The above dynamic paging occasion is, A method characterized in that it consists of N consecutive time slots, wherein N is an integer greater than or equal to 1.

12. In a terminal receiving a paging message, A receiving unit that receives a wake-up signal (WUS) from a base station through a low-power receiver; and A terminal including a control unit that monitors a paging message in a dynamic paging occasion set based on the wake-up signal.

13. In paragraph 12, The above low power receiver, A terminal characterized in that it is configured to receive the wake-up signal and is distinguished from a receiver that monitors the paging message.

14. In paragraph 12, The above dynamic paging occasion is, A terminal that is determined based on configuration information for setting an operation linked to the above low-power receiver, and is set separately from a paging occasion set according to a DRX (Discontinuous Reception) operation.

15. In paragraph 14, The above dynamic paging occasion is, A terminal characterized in that it is set to arrive earlier on the time axis than the paging occasion that first arrives after receiving the wake-up signal.

16. In paragraph 12, The above dynamic paging occasion is, A terminal characterized in that it is set to start after X slots at the time of receiving the wake-up signal, wherein X is an integer greater than or equal to 1.

17. In paragraph 12, The above dynamic paging occasion is, A terminal characterized in that it consists of N consecutive time slots, wherein N is an integer greater than or equal to 1.

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