Method and device for transmitting and receiving signals in wireless communication system

Abstract

Disclosed are methods for, in relation to WUS transmission and reception, determining whether a WUS monitoring occasion is valid when a cell DTX active period and a DRX active time of a terminal partially or fully overlap. Specifically, whether a monitoring occasion is valid is determined on the basis of whether a DRX active time partially overlapping a cell DTX active period is valid, a time interval configured on the basis of a wake-up delay, a length of a timer related to a start of the DRX active time, and the like.

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] This specification relates to methods and devices used in wireless communication systems.

[0002] Wireless communication systems are being widely deployed to provide various types of communication services, such as voice and data. Generally, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include CDMA (Code Division Multiple Access), FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), and SC-FDMA (Single Carrier Frequency Division Multiple Access).

[0003] The technical problem to be solved by the present specification is to provide a method for efficiently transmitting and receiving wireless communication signals and an apparatus for doing so.

[0004] The technical challenges are not limited to those described above, and other technical challenges can be inferred from the embodiments.

[0005] The present specification provides a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0006] As an embodiment of the present specification, a method is provided comprising: receiving first configuration information for a cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and receiving second configuration information for a WUS (Wake-Up Signal); and monitoring the WUS based on the first configuration information and the second configuration information; wherein, based on the cell DTX active period based on the first configuration information overlapping with the terminal's DRX active time, a WUS monitoring opportunity between a first time point and a second time point among the WUS monitoring opportunities based on the second configuration information is determined to be valid, and monitoring of the WUS is performed during the valid monitoring opportunity.

[0007] In another aspect of the present specification, a device for performing the method comprises a terminal, a processor, and a storage medium.

[0008] In another aspect of the present specification, a method is provided comprising: transmitting first configuration information for a cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and transmitting second configuration information for a WUS (Wake-Up Signal); and transmitting the WUS based on the first configuration information and the second configuration information, wherein, based on the cell DTX active period based on the first configuration information overlapping with the terminal's DRX active time, a WUS monitoring opportunity between a first time point and a second time point among WUS monitoring opportunities based on the second configuration information is determined to be valid, and transmission of the WUS is performed during the valid monitoring opportunity.

[0009] In another aspect of the present specification, a base station, a processor, and a storage medium are provided as an apparatus for performing the method.

[0010] The above devices may include at least a terminal, a network, and an autonomous vehicle capable of communicating with other autonomous vehicles other than the device.

[0011] The embodiments of this specification described above are merely some of the preferred embodiments of this specification, and various embodiments reflecting the technical features can be derived and understood by those skilled in the art based on the detailed description.

[0012] According to one embodiment of the present specification, when a signal is transmitted and received between communication devices, there is an advantage that more efficient signal transmission and reception can be performed through an operation differentiated from the prior art.

[0013] The technical effects are not limited to those described above, and other technical effects may be inferred from the examples.

[0014] FIG. 1 illustrates an exemplary flexible network topology to which some of the examples of the present specification may be applied.

[0015] FIG. 2 illustrates an example of a communication system applicable to the present disclosure.

[0016] FIG. 3 illustrates an example of a wireless device that can be applied to the present disclosure.

[0017] FIG. 4 illustrates a communication procedure between a first node (e.g., a terminal) and a second node (e.g., a base station) applicable to the present disclosure.

[0018] FIGS. 5 to 13 are drawings for explaining a signal transmission and reception method according to an embodiment of the present disclosure.

[0019] In this specification, "A or B" may mean "only A," "only B," or "both A and B." Alternatively, in this specification, "A or B" may be interpreted as "A and / or B." For example, in this specification, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C."

[0020] A slash ( / ) or a comma used in this specification may mean "and / or." For example, "A / B" may mean "A and / or B." Accordingly, "A / B" may mean "only A," "only B," or "both A and B." For example, "A, B, C" may mean "A, B or C."

[0021] In this specification, "at least one of A and B" may mean "only A," "only B," or "both A and B." Additionally, in this specification, the expressions "at least one of A or B" or "at least one of A and / or B" may be interpreted as synonymous with "at least one of A and B."

[0022] Additionally, in this specification, "at least one of A, B and C" may mean "only A," "only B," "only C," or "any combination of A, B and C." Also, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C."

[0023] Additionally, parentheses used in this specification may mean "for example." Specifically, when indicated as "control information (ABC)," "ABC" may be described as an example of "control information." For example, "control information" may include DEF as another example. In other words, "control information" in this specification is not limited to "ABC," and "ABC" may be described as an example of "control information." Also, when indicated as "control information (i.e., ABC)," "ABC" may be described as an example of "control information."

[0024] In addition, terms such as "first," "second," etc. in this specification are used solely for the purpose of distinguishing one component from another and are not used to limit the components, nor are they used to limit the order or importance of the components unless specifically limited. Accordingly, a first component in one embodiment of this specification may be referred to as a second component in another embodiment, and likewise, a second component in one embodiment may be referred to as a first component in another embodiment.

[0025] In the following explanation, 'when, if, in case of' can be replaced with 'based on'.

[0026] Technical features described individually within a single drawing in this specification may be implemented individually or simultaneously.

[0027] In this specification, a terminal is a user-side device (user equipment, UE) or a consumer-side device, and may also be referred to as a first node that receives / transmits signals from / to a base station / second node / IAB node / Transmission-Reception Point (TRP). A terminal may correspond to a physical node or a logical node. A terminal may correspond to a user-side endpoint or an intermediate point between other endpoints. In communication between two points not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a terminal may correspond to a served node. A terminal may be a fixed-location node or a non-fixed-location (or mobile) node.

[0028] In this specification, a Base Station (BS) is a device on the network side and may also be referred to as a second node / IAB node / x-NodeB (x-NodeB, where x may be an abbreviation related to Radio Access Technology (RAT)) / Transmission-Reception Point (TRP). A Base Station may correspond to a physical node or a logical node. A Base Station may correspond to an endpoint on the network side or an intermediate point between other endpoints. In communication between two points not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a Base Station may correspond to a serving node. A Base Station may be a node with a fixed location or a node with an indefinite location.

[0029] In this specification, higher layer parameters may be set for the terminal, pre-set, or pre-defined. For example, a base station may transmit higher layer parameters to the terminal. For example, the terminal may transmit parameters such as capability to the base station as higher layer parameters. For example, higher layer parameters may be transmitted via RRC (radio resource control) signaling or MAC (medium access control) signaling.

[0030] In this specification, information / state / parameters being "configured" or "pre-configured" may be interpreted as the information / state / parameters being provided / pre-provided to the terminal through pre-defined signaling (e.g., SIB, MAC, RRC) from the base station. In this specification, information / state / parameters being "defined" or "pre-defined" may be interpreted as being known or stored in advance by the base station and the terminal without signaling between the base station and the terminal.

[0031] The technology described in this specification can be used in various wireless communication systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). 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 with wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), LTE (long term evolution), and 5G NR.

[0032] The technology described in this specification can be implemented as 6G wireless technology and applied to various 6G systems. For example, 6G systems may have key factors such as eMBB (enhanced mobile broadband), URLLC (ultra-reliable low latency communications), mMTC (massive machine-type communication), AI (artificial intelligence) integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0033] In a wireless communication system, a terminal receives information from a base station via the downlink (DL) and transmits information to the base station via the uplink (UL). The information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels and signals exist depending on the type and purpose of the information being transmitted and received. A physical channel corresponds to a set of resource elements (REs) that carry information originating from the upper layer. A physical signal corresponds to a set of resource elements (REs) used by the physical layer (PHY), but it does not carry information originating from the upper layer. The upper layer includes the MAC (Medium Access Control) layer, RLC (Radio Link Control) layer, PDCP (Packet Data Convergence Protocol) layer, RRC (Radio Resource Control) layer, etc.

[0034] DL physical channels include PBCH (Physical Broadcast Channel), PDSCH (Physical Downlink Shared Channel), and PDCCH (Physical Downlink Control Channel). DL physical signals include DL RS (Reference Signal), PSS (Primary Synchronization Signal), and SSS (Secondary Synchronization Signal). DL RS includes DM-RS (Demodulation RS), PT-RS (Phase-tracking RS), and CSI-RS (Channel-state Information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RS. UL RS includes DM-RS, PT-RS, and SRS (Sounding RS).

[0035] FIG. 1 illustrates an exemplary flexible network topology to which some of the examples of the present specification may be applied.

[0036] To compensate for incomplete areas of network coverage, a network topology in which the Split Radio Access Network (RAN) is configured more flexibly and resiliently may be considered. To this end, various nodes such as IAB nodes, relays, and RF repeaters, as exemplified in Fig. 1, may be applied, and NTN may be integrated. For example, an IAB node may correspond to a node that provides wireless backhaul. For example, a relay may refer to any intermediate point, and in the case of a sidelink relay where a terminal functions as a relay, it may collectively refer to a terminal-to-network (U2N) relay and a terminal-to-terminal (U2U) relay. For example, an RF repeater may correspond to a node that performs simple signal amplification and forwarding functions, and in the case of a network-controlled repeater, it may adjust transmit / receive settings based on information provided by the network as well as signal amplification and forwarding. For example, an NTN node may correspond to a satellite or aircraft that provides NTN coverage that is difficult for a terrestrial network to provide. In addition to these examples, various intermediate points can be introduced to improve network topology.

[0037] Referring to FIG. 1, a split RAN can support the division of a base station into one centralized unit (CU) and one or more distributed units (DU). The CU and DU may correspond to logical units. The CU may be further divided into a control plane (CP) portion and one or more user plane (UP) portions. Since a failure in the CU-CP affects not only the CU-UP but also the DU, various intermediate points may be introduced to compensate for this.

[0038] An intermediate point may correspond to a terminal or a base station depending on its relative relationship with other nodes. For example, an IAB node may include a mobile-termination (MT) portion and a DU. The MT can connect the IAB node to a donor node. The DU of the IAB node may serve other terminals or connect to other IAB nodes to provide multi-hop wireless backhaul to terminals. In other words, an IAB node may correspond to a base station in its relative relationship with user-side nodes and to a terminal in its relative relationship with network-side nodes.

[0039] In some examples of this specification, the description of a terminal may apply equally to an intermediate point corresponding to a terminal in relation to a network-side endpoint as well as to a user-side endpoint. Similarly, in some examples of this specification, the description of a base station may apply equally to an intermediate point corresponding to a base station in relation to a user-side endpoint as well as to a network-side endpoint. However, in most cases where there is no additional description of the operation of three or more entities, the communication entities in this specification are briefly described by the term terminal and / or base station (or first node and / or second node), wherein the term terminal and / or base station (or first node and / or second node) is interpreted to include or replace any endpoint or any intermediate point in relation to other nodes.

[0040] That is, for the sake of brevity of description in some examples of this specification, the subject of the operation may be referred to as a base station and / or terminal (or a first node and / or a second node). Additionally, the term base station and / or terminal (or a first node and / or a second node) may be interpreted or substituted as in the following examples: for example, the base station (or the first node) and the terminal (or the second node) may correspond to a first endpoint and a second endpoint, respectively; may correspond to an endpoint and an intermediate point, respectively; may correspond to an intermediate point and an endpoint, respectively; or may correspond to a first intermediate point and a second intermediate point, respectively.

[0041] In this specification, there may be no intermediate points between the base station and the terminal, or there may be one or more. If intermediate points exist, the intermediate points may correspond to IAB nodes, relays, RF repeaters, NTN (non-terrestrial network) nodes, or nodes supporting other functions. The intermediate points may be nodes with a fixed location or nodes with an indefinite location.

[0042] FIG. 2 illustrates a communication system applicable to the present disclosure.

[0043] The communication system (100) of FIG. 2 includes a wireless device (110), a network device (120), and a network (130). Here, the wireless device (110) refers to a device that performs communication using wireless access technology (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G) and may be referred to as a communication / wireless / 5G / 6G device. Although not limited thereto, the wireless device (110) may include a robot (110a), a vehicle (110b-1, 110b-2), an XR (extended reality) device (110c), a hand-held device (110d), a home appliance (110e), an IoT (Internet of Thing) device (110f), and an AI (artificial intelligence) device / server (110g). For example, the vehicle may include a vehicle equipped with wireless communication capabilities, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, etc. Here, the vehicle (110b-1, 110b-2) may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device (110c) includes an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) equipped in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. The portable device (110d) may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch, smart glasses), a computer (e.g., a laptop, etc.). The home appliance (110e) may include a TV, a refrigerator, a washing machine, etc. The IoT device (110f) may include a sensor, a smart meter, etc. The wireless device (110) may correspond to a terminal (or first node) or an intermediate point.The network device (120) may correspond to a base station (or a second node) or another intermediate point. For example, the network device (120) may also be implemented as a wireless device (110), and a specific wireless device (120a) may operate as a network device (120) to another wireless device (110).

[0044] Wireless devices (110a to 110f) can be connected to a network (130) through a network device (120). AI technology may be applied to the wireless devices (110a to 110f), and the wireless devices (110a to 110f) can be connected to an AI server (110g) through the network (130). The network (130) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, or a 6G network. The wireless devices (110a to 110f) may communicate with each other through the network device (120) / network (130), but may also communicate directly (e.g., sidelink communication) without going through the network device (120) / network (130). For example, vehicles (110b-1, 110b-2) can communicate directly (e.g., V2V (vehicle to vehicle) / V2X (vehicle to everything) communication). Also, an IoT device (110f) (e.g., a sensor) can communicate directly with another IoT device (e.g., a sensor) or other wireless devices (110a to 110f).

[0045] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (110a to 110f) / network devices (120) and between network devices (120). Here, wireless communication / connection can be established through various wireless access technologies such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and communication between network devices (150c) (e.g., relay, IAB (integrated access backhaul)). Through wireless communication / connection (150a, 150b, 150c), wireless devices and network devices / wireless devices, and network devices and network devices can transmit / receive wireless signals to / from each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, based on the various descriptions of the present disclosure, at least some of the following may be performed: a process for setting various configuration information for the transmission / reception of a wireless signal, a process for various signal processing (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), a resource allocation process, etc.

[0046] FIG. 3 illustrates an example of a wireless device that can be applied to the present disclosure.

[0047] Referring to FIG. 3, the wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G). The wireless device (200) includes at least one processor (202) and at least one memory (204), and may additionally include at least one transceiver (206) and / or at least one antenna (208).

[0048] The processor (202) controls the memory (204) and / or the transceiver (206) and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or sequences of operation disclosed in this document. For example, the processor (202) may process information within the memory (204) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (206). Additionally, the processor (202) may receive a wireless signal containing a second information / signal through the transceiver (206) and then store information obtained from the signal processing of the second information / signal in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, memory (204) may store software code containing instructions for performing some or all of the processes controlled by the processor (202) or for performing the descriptions, functions, procedures, proposals, methods, and / or sequences of operations disclosed in this document. Here, the processor (202) and memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology. A transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals through at least one antenna (208). The transceiver (206) may include a transmitter and / or receiver. The transceiver (206) may be interchangeable with an RF (radio frequency) unit. In this disclosure, a wireless device may mean a communication modem / circuit / chip.

[0049] Hereinafter, hardware elements of the wireless device (200) will be described in more detail. Although not limited thereto, at least one protocol layer may be implemented by at least one processor (202). For example, at least one processor (202) may implement at least one layer (e.g., functional layers such as PHY (physical), MAC (media access control), RLC (radio link control), PDCP (packet data convergence protocol), RRC (radio resource control), and SDAP (service data adaptation protocol). At least one processor (202) may generate at least one PDU (Protocol Data Unit) and / or at least one SDU (service data unit) according to the descriptions, functions, procedures, proposals, methods and / or operation sequences disclosed in this document. At least one processor (202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods and / or operation sequences disclosed in this document. At least one processor (202) may generate a signal (e.g., baseband signal) including a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document and provide it to at least one transceiver (206). At least one processor (202) may receive a signal (e.g., baseband signal) from at least one transceiver (206) and may obtain a PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document.

[0050] At least one processor (202) may be referred to as a controller, microcontroller, microprocessor, or microcomputer. At least one processor (202) may be implemented by hardware, firmware, software, or a combination thereof. For example, at least one application-specific integrated circuit (ASIC), at least one digital signal processor (DSP), at least one digital signal processing device (DSPD), at least one programmable logic device (PLD), or at least one field programmable gate array (FPGA) may be included in at least one processor (202). The descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document may be included in at least one processor (202) or stored in at least one memory (204) and driven by at least one processor (202). The descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this document may be implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0051] At least one memory (204) may be connected to at least one processor (202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. At least one memory (204) may be composed of ROM (read-only memory), RAM (random access memory), EPROM (erasable programmable read-only memory), flash memory, hard drive, registers, cache memory, computer read storage media, and / or combinations thereof. At least one memory (204) may be located inside and / or outside of at least one processor (202). Additionally, at least one memory (204) may be connected to at least one processor (202) via various technologies, such as wired or wireless connections.

[0052] At least one transceiver (206) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc. of this document to at least one other device. At least one transceiver (206) may receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or operation flowcharts, etc. disclosed in this document from at least one other device. For example, at least one transceiver (206) may be connected to at least one processor (202) and may transmit and receive wireless signals. For example, at least one processor (202) may control at least one transceiver (206) to transmit user data, control information, or wireless signals to at least one other device. Additionally, at least one processor (202) may control at least one transceiver (206) to receive user data, control information, or wireless signals from at least one other device. Additionally, at least one transceiver (206) may be connected to at least one antenna (208), and at least one transceiver (206) may be configured to transmit and receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in this document through at least one antenna (208). In this document, at least one antenna may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). At least one transceiver (206) may convert the received wireless signals / channels, etc., from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc., using at least one processor (202). At least one transceiver (206) may convert the processed user data, control information, wireless signals / channels, etc., from baseband signals to RF band signals using at least one processor (202).To this end, at least one transceiver (206) may include an (analog) oscillator and / or filter.

[0053] The components of the wireless device described with reference to FIG. 3 may be referred to by other terms in terms of their function. For example, the processor (202) may be referred to as the control unit, the transceiver (206) as the communication unit, and the memory (204) as the storage unit. In some cases, the communication unit may be used to mean at least a part of the processor (202) and the transceiver (206).

[0054] The structure of the wireless device described with reference to FIG. 3 can be understood as the structure of at least part of various devices. For example, the structure of the wireless device illustrated in FIG. 3 may be at least part of the various devices described with reference to FIG. 2 (e.g., robot (110a), vehicle (110b-1, 110b-2), XR device (110c), portable device (110d), home appliance (110e), IoT device (110f), AI device / server (110g)). Furthermore, according to various embodiments, the device may include other components in addition to the components illustrated in FIG. 3.

[0055] For example, the device may be a portable device such as a smartphone, smartpad, wearable device (e.g., smart watch, smart glasses), or portable computer (e.g., laptop, etc.). In this case, the device may further include at least one of a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc., an interface unit that includes at least one port for connection with another device (e.g., audio input / output port, video input / output port), and an input / output unit for inputting and outputting video information / signals, audio information / signals, data, and / or information input by a user.

[0056] For example, the device may be a mobile device such as a mobile robot, vehicle, train, manned / unmanned aerial vehicle (AV), or ship. In this case, the device may further include at least one of a drive unit comprising at least one of an engine, motor, power train, wheel, brake, and steering device of the device; a power supply unit that supplies power and includes a wired / wireless charging circuit, battery, etc.; a sensor unit that senses state information, environmental information, and user information of the device or its surroundings; an autonomous driving unit that performs functions such as path maintenance, speed control, and destination setting; and a position measurement unit that acquires position information of the moving body through a GPS (global positioning system) and various sensors.

[0057] For example, the device may be an XR device such as an HMD, a HUD (head-up display) equipped in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. In this case, the device may further include at least one of a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc., an input / output unit that acquires control information, data, etc. from the outside and outputs a generated XR object, and a sensor unit that senses state information, environment information, and user information of the device or the surroundings of the device.

[0058] For example, the device may be a robot that can be classified into industrial, medical, household, military, etc., depending on the purpose or field of use. In this case, the device may further include at least one of a sensor unit that senses state information, environmental information, and user information of the device or its surroundings, and a drive unit that performs various physical actions, such as moving robot joints.

[0059] For example, the device may be an AI device such as a TV, projector, smartphone, PC, laptop, digital broadcasting terminal, tablet PC, wearable device, set-top box (STB), radio, washing machine, refrigerator, digital signage, robot, vehicle, etc. In this case, the device may further include at least one of an input unit that acquires various types of data from the outside, an output unit that generates output related to sight, hearing, or touch, a sensor unit that senses state information, environmental information, and user information of the device or its surroundings, and a training unit that learns a model composed of an artificial neural network using training data.

[0060] The structure of the wireless device exemplified in FIG. 3 may be understood as part of a terminal (or first node), or part of an intermediate point, or part of a base station (or second node). If the device exemplified in FIG. 3 is a base station (or second node), the device may further include a wired transceiver for front haul and / or back haul communication. However, if the front haul and / or back haul communication is based on wireless communication, at least one transceiver (206) exemplified in FIG. 3 is used for front haul and / or back haul communication, and the wired transceiver may not be included.

[0061] FIG. 4 illustrates a communication procedure between a first node (e.g., a terminal) and a second node (e.g., a base station) applicable to the present disclosure.

[0062] The second node of FIG. 4 supports dynamic spectrum sharing (DSS) and can provide connectivity to both nodes where 6G technology is implemented and nodes where pre-6G wireless communication technology (e.g., 5G, 4G) is implemented. That is, the first node of FIG. 4 may have 6G technology implemented or pre-6G wireless communication technology (e.g., 5G, 4G) implemented. Additionally, the first node and / or the second node may support full duplex mode as well as non-overlapping full duplex mode.

[0063] In FIG. 4, for the sake of simplicity of explanation, the first node and the second node are assumed to be a terminal and a base station, respectively, and the operation of the terminal (110) and the base station (120) transmitting and / or receiving data, and the operation performed prior to this, are illustrated. However, the operation of FIG. 4 is not limited to the operation between the terminal and the base station, but can be interpreted as the operation between the first node and the second node. Additionally, FIG. 4 illustrates the operation of direct transmission and reception of wireless signals between the terminal (110) and the base station (120), but there may be one or more intermediate points between the terminal (110) and the base station (120), and wireless signals may be transmitted and received via one or more intermediate points.

[0064] Referring to FIG. 4, the terminal (110) and the base station (120) can perform synchronization (401). For example, the terminal (110) performs an initial cell search operation. Specifically, the terminal (110) can detect a synchronization signal for at least one base station connection transmitted from the base station (120) according to a predefined rule. Here, the synchronization signal may include a plurality of synchronization signals classified according to structure or use (e.g., a first synchronization signal (e.g., a primary synchronization signal), a second synchronization signal (e.g., a secondary synchronization signal), etc.). Through this, the terminal (110) can identify the boundary of the unit (e.g., frame, subframe, slot and / or symbol) constituting the wireless signal transmission of the base station (120) and obtain information about the base station (120) (e.g., cell identifier).

[0065] The terminal (110) can obtain system information transmitted from the base station (120) (403). System information is information related to the attributes, characteristics, and / or capabilities of the base station (120) required to connect to the base station (120) and use the service, and can be classified according to content (e.g., whether it is essential for connection), transmission structure (e.g., channel used, whether it is provided on-demand), etc., and can be classified, for example, into first system information (e.g., MIB (master information block), primary system information), second system information (e.g., SIB (system information block), secondary system information), etc. If necessary, the terminal (110) may transmit a signal requesting system information prior to receiving the system information. However, the request and provision of system information may be performed after the random access procedure described later.

[0066] A terminal (110) and a base station (120) can perform a random access procedure (405). The terminal (110) can transmit and / or receive at least one message for a random access procedure (e.g., random access preamble, RAR (random access response) message, etc.) based on information related to the channel for the random access procedure of the base station (120) obtained through system information (e.g., channel location, channel structure, structure of supported preamble, etc.). For example, the terminal (110) can transmit a first message (e.g., preamble, MSG1) through the channel for the random access procedure, receive a second message (e.g., RAR message, MSG2), transmit a third message (e.g., MSG3) containing information related to the terminal (110) (e.g., identification information) to the base station (120) using scheduling information included in the second message, and receive a fourth message (e.g., MSG4) for contention resolution and / or connection establishment. As another example, the first message and the third message can be transmitted and received as a single message, or the second message and the fourth message can be transmitted and received as a single message.

[0067] The terminal (110) and the base station (120) can perform signaling of control information (407). Here, the control information can be defined in various layers, such as a layer that controls the connection (e.g., a radio resource control (RRC) layer), a layer that handles mapping between logical channels and transmission channels (e.g., a media access control (MAC) layer), and a layer that handles physical channels (e.g., a physical (PHY) layer). For example, the terminal (110) and the base station (120) can perform at least one of signaling to establish a connection, signaling to determine settings related to communication, and signaling to indicate allocated resources.

[0068] The terminal (110) and the base station (120) can transmit and / or receive data (409). In other words, the terminal (110) and the base station (120) can process, transmit and / or receive data based on the signaling of control information. For example, when transmitting data, the terminal (110) or the base station (120) can perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and resource mapping on the information bits. Conversely, when receiving data, the terminal (110) or the base station (120) can perform at least one of signal extraction from resources, antenna-specific waveform demodulation, signal placement considering layer mapping, constellation demapping, descrambling, and channel decoding.

[0069] 6G System Core Technology

[0070] The 6G (wireless communication) system aims for (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption of battery-free IoT (internet of things) devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity.

[0071] As core implementation technologies for 6G systems, technologies such as artificial intelligence (AI), THz (Terahertz) communication, optical wireless technology, FSO backhaul network, massive MIMO technology, blockchain, 3D networking, quantum communication, unmanned aerial vehicles, cell-free communication, wireless information and energy transfer (WIET), integration of sensing and communication, integration of access backhaul networks, holographic beamforming, big data analysis, and large intelligent surface (LIS) can be adopted.

[0072] LP-WUS

[0073] The contents examined above can be applied in combination with the proposed methods described below, or can be supplemented to clarify the technical characteristics of the proposed methods.

[0074] In addition, the methods described below can be applied in the same way to the NR system (licensed band) or shared spectrum described above, and it goes without saying that the technical concept proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that it can be implemented in the system as well.

[0075] In the Rel-18 NR standard, discussions are underway to introduce LP-WUS (low power wake-up signal) and LP-WUR (low power wake-up receiver or low power wake-up radio), a separate receiver capable of receiving it, as a method for reducing power consumption that differs slightly from the terminal power consumption reduction techniques introduced or supported in Rel-16 / 17 and others. When the receiver within the terminal (the receiver in the downlink) in existing NR systems is referred to as MR (Main radio / receiver), LP-WUR refers to a separate receiver (i.e., companion radio / receiver) that can be introduced to reduce the power consumption of the MR. LP-WUR can be simply represented as LR.

[0076] Meanwhile, a separate LP-SS (low power synchronization signal) may be defined and transmitted for time / frequency synchronization required for receiving the LP-WUR transmitted from the LP-WUR. The LP-SS may be a signal / waveform generated according to an OOK or FSK waveform generation method (similar to the LP-WUS), and an overlaid sequence may be applied. The LP-SS may be a signal transmitted periodically or aperiodisically. Based on the LP-SS, the LP-WUR may measure the power of the received signal, etc., to offload or relax the RRM measurement of the MR.

[0077] In the proposal below, the term "occasion" may refer to a transmission occasion (TO) where the base station transmits a signal, or a monitoring occasion (MO) where the receiver (such as an LP-WUR) monitors the signal, depending on the context. Since TO signifies an opportunity for a signal to be transmitted, the signal may not be transmitted at that location (depending on the configuration or the needs of the base station). Since MO signifies an opportunity to monitor the signal, the receiver may not monitor the signal at that location (depending on the configuration or the needs / situations of the base station / terminal). Additionally, for the sake of convenience, even if expressed simply as MO or TO, MO, TO, or MO and TO may be indicated depending on the proposed method and context.

[0078] In the proposal below, setting the opportunity for LP-SS / LP-WUS can be interpreted as setting one or more of the period, starting time, ending time, duration, offset within the period, and the frequency at which the corresponding signal is transmitted.

[0079] Various candidates are being considered for the architecture of LP-WUR, and depending on the architecture adopted, the power consumption of LP-WUR in the on and off states may vary.

[0080] At this time, the power consumption of the LP-WUR in the ON state may be at a level that cannot be ignored, or for other reasons, the terminal may be required to activate or deactivate the LP-WUR. To support this, entry conditions for the terminal to enter the activated state of the LP-WUR and exit conditions for the terminal to exit the activated state may be defined.

[0081] Generally, terminals in RRC_CONNECTED mode (hereinafter referred to as CONNECTED mode or connection mode) consume a significant amount of power for PDDCH monitoring. Since the terminal monitors the PDCCH using MR, the longer the MR remains in a sleep state, the more power the terminal can reduce. To reduce power consumption, DRX operations, WUS (wake-up signal), and PDCCH monitoring adaptation operations have been introduced. All of these operations were introduced to reduce the time the terminal monitors the PDCCH and to guarantee the sleep time of the MR, thereby reducing the terminal's power consumption.

[0082] By utilizing LP-WUS / LP-WUR, the frequency of PDCCH monitoring performed by the terminal's MR can be reduced. Since the terminal's LP-WUR operates at relatively low power, it consumes less power compared to MR. A terminal in CONNECTED mode can reduce power consumption by operating the MR in a (deep / light / micro) sleep state, thereby not performing PDCCH monitoring. Additionally, if the terminal receives LP-WUS via LR and wakes up the MR based on the instructions in the received signal, the MR's sleep time can be extended. Furthermore, the terminal can receive other instructions via LP-WUS and operate the MR accordingly. For example, the terminal can receive instructions via LP-WUS to temporarily switch the MR to a sleep state.

[0083] When the terminal's PDCCH monitoring status is indicated via LP-WUS, the frequency of PDCCH monitoring performed by the terminal's MR can be adjusted. For example, when the MR is off or in a sleep state, the terminal receives LP-WUS using LP-WUR. The terminal activates the MR to perform PDCCH monitoring only when the correct LP-WUS is received. By triggering the operation of the MR via LP-WUS, unnecessary PDCCH monitoring is reduced. Lowering the frequency of PDCCH monitoring can reduce the terminal's power consumption.

[0084] LP-WUS is modulated with OOK (On-Off Keying) to align with the slot or symbol structure of the time axis, but can be transmitted without aligning with the RE structure of the frequency axis. LP-WUS is configured to have a signal or no signal within a specific time interval, and the terminal can receive the signal simply by energy detection within that specific time interval. A sequence for spectrum flattening may be superimposed on the OOK symbol of the LP-WUS, or an OFDM sequence for extending transmission coverage or transmitting additional information may be superimposed.

[0085] Meanwhile, the LP-WUS signal may be used in conjunction with the OOK waveform with an overlaid sequence. Depending on how the overlaid sequence is overlaid on each OOK signal or OFDM signal, it may affect the LP-WUS transmission time and / or the frequency resources occupied by the LP-WUS. Additionally, if information is transmitted through the overlaid sequence, this may serve as a method to expand the utilization of the LP-WUS signal. However, not all LP-WUSs can detect / decode the overlaid sequence. If the overlaid sequence modulates each subcarrier in the frequency domain, only LP-WUSs possessing Fast Fourier Transform (FFT) and / or frequency domain sequence correlation capabilities can receive the overlaid sequence. Even if the sequence is overlaid on each OOK symbol or OFDM symbol in the time domain, only LP-WUSes possessing time domain sequence correlation capabilities can receive the sequence. Since the LP-WUR of the lowest complexity may only distinguish between ON / OFF of OOK symbols, the overlaid sequence needs to be designed to take these various types of LP-WURs into account.

[0086] A WUR capable of only energy detection can be defined as LP-WUR Type 1, and a WUR capable of sequence detection can be defined as LP-WUR Type 2. LP-WUR Type 1 is configured at a low cost and can receive only information transmitted through the payload of OOK symbols. LP-WUR Type 2 is configured at a higher cost than LP-WUR Type 1 and can detect an overlaid OFDM sequence in addition to the payload of OOK symbols. LP-WUR Type 2 can also receive PSS / SSS, which are signals related to MR.

[0087] The operation of a terminal triggering PDCCH monitoring based on a received LP-WUS can be implemented in various ways. An example of a method for triggering PDCCH monitoring by LP-WUS for a terminal configured with C-DRX (Connected mode discontinuous reception) is as follows.

[0088] Example 1) The terminal may receive LP-WUS in a time interval preceding the start time of the periodically configured drx-onDurationTimer to be instructed on whether to start the drx-onDurationTimer. (This may be an operation that replaces the DCP.)

[0089] Example 2) The terminal can receive LP-WUS outside of the existing C-DRX active time to be instructed to an additional potential PDCCH monitoring period in addition to the existing periodic drx-onDurationTimer.

[0090] Example 1 can be understood as an operation where LP-WUS replaces the wake-up indication of DCP. For example, when LP-WUS is received instead of the existing DCI format 2_6, it may indicate whether to start the periodically configured drx-onDurationTimer. During periods when there is no potential DRX active time, the terminal keeps the MR in a sleep state to reduce power consumption and operates LP-WUR to receive the LP-WUS. Based on the reception of LP-WUS, the start of drx-onDurationTimer may be determined according to the preset DRX operation.

[0091] Example 2 may be an operation in which the LP-WUS is received outside the existing C-DRX active time, thereby indicating an additional potential PDCCH monitoring period. This may be an operation in which the terminal's PDCCH monitoring operation is always indicated solely by the LP-WUS, regardless of the DRX configured on the terminal. The PDCCH monitoring operation may be performed within the time interval in which the new timer introduced for the operation of Example 2 is in operation. Therefore, the new timer may refer to a timer capable of starting a non-periodic DRX active time that can be initiated by the instruction of the LP-WUS. Even if the existing periodic drx-onDurationTimer is started, PDCCH monitoring may not be performed by the terminal without an instruction from the LP-WUS. The terminal may perform only the operations that can be performed during the other DRX active time, in accordance with the current standard. The operations that can be performed may include measurement and reporting.

[0092] In addition, Example 2 can also be considered as the operation when periodic C-DRX is not configured on the terminal. Without a pre-configured reception interval to start or not start at regular intervals, the terminal may be instructed by the LP-WUS to perform PDCCH monitoring with MR only.

[0093] Generally, the DRX active time may refer to the period during which PDCCH monitoring is performed by operating a related timer by the terminal. As in the example operation above, PDCCH monitoring may be performed within the time interval during which a specific timer is operating. The specific timer may include DRX timers such as drx-onDurationTimer and a new timer. Therefore, in the operation within the proposed method, the start time of PDCCH monitoring may refer to the start time of the timer. Consequently, the operation in which the start time of PDCCH monitoring is determined through the proposed method may be identical to the operation in which the start time of the timer is determined. Unless otherwise noted, the timer in this specification may refer to a DRX timer or a new timer.

[0094] In this specification, it may be assumed that when PDCCH monitoring of a terminal is triggered by the LP-WUS in a cell where Cell Discontinuous Transmission (Cell DTX) is configured, the DRX active time of said terminal does not completely overlap with the Cell DTX active time. In existing NR standards, the DRX active times of terminals may be configured to be located within the Cell DTX active time. However, the DRX active time of all terminals is not necessarily restricted to being configured only within the Cell DTX active time. Furthermore, as in the operation of Example 2 above, when a non-periodic DRX active time operation period is directly indicated by the LP-WUS, cases where the DRX active time does not completely overlap with the Cell DTX active time and is misaligned may occur more frequently. For some reason, there may be cases where the DRX active time for a specific terminal is not aligned within the Cell DTX active time period. Therefore, it is necessary to define the terminal operation during the misaligned time period.

[0095] In this specification, two cases may be assumed where the cell DTX active period and the DRX active time indicated by LP-WUS are out of sync. In this specification, a period other than the cell DTX active period may be referred to as the cell DTX inactive period.

[0096] Referring to FIG. 5, the first case in this specification may represent a case where the start time of the DRX active time indicated by the LP-WUS is located in the cell DTX inactive period, but part of the operating period overlaps with the cell DTX active period. FG101 represents the cell DTX active period of the cell, which is the period during which the base station transmits a signal. FG102 represents the operation in which the terminal receives the LP-WUS using LR. Additionally, the terminal triggers MR by confirming the wake-up signal. FG103 represents the period during which the terminal performs PDCCH monitoring via MR based on the reception of the LP-WUS. That is, FG103 may represent the period during which the terminal operates based on the DRX active time.

[0097] Referring to FIG. 6, the second case in this specification represents a case where the start time of the DRX active time indicated by the LP-WUS is located within the cell DTX active period, but part of the operating period overlaps with the cell DTX inactive period. FG201 represents the cell DTX active period of the cell, which is the period during which the base station transmits a signal. FG202 represents the operation in which the terminal receives the LP-WUS using the LP-WUR. Additionally, the terminal triggers MR by confirming the wake-up signal. FG203 represents the period during which the terminal performs PDCCH monitoring via MR based on the reception of the LP-WUS. That is, FG203 may represent the period during which the terminal operates based on the DRX active time.

[0098] In the present specification, a method for determining the validity of an LP-WUS MO is proposed for indicating the PDCCH monitoring and / or DRX activation time of a terminal when a first case and / or a second case occurs. For a valid monitoring opportunity (valid MO), the terminal may expect reception of the LP-WUS at the corresponding MO and perform monitoring. For an invalid monitoring opportunity (invalid MO), the terminal may not perform monitoring because it does not expect reception of the LP-WUS at the corresponding MO. The validity of an MO may mean that the terminal determines whether the MO is valid or invalid. An MO described in the present specification without separate explanation may refer to an LP-WUS MO, which is a monitoring opportunity for the LP-WUS.

[0099] Specifically, a method is proposed for determining the validity of an LP-WUS MO that allows a terminal to be instructed on a DRX activation time when a first case and / or a second case occurs. A valid LP-WUS MO may include one or more of the LP-WUS MOs corresponding to the following cases.

[0100] - When the DRX activation time indicated by the LP-WUS MO completely overlaps with the cell DTX activation period

[0101] - When the LP-WUS MO is located within the cell DTX active range

[0102] An invalid LP-WUS MO may include an LP-WUS MO corresponding to the following cases.

[0103] - When the LP-WUS MO is located outside the cell DTX active period and the DRX active time that can be indicated by the LP-WUS MO does not overlap with the cell DTX active period at all

[0104] If the DRX active time indicated by the LP-WUS MO partially overlaps with the cell DTX active time, the validity of the LP-WUS MO may be determined by the setting. The setting may be determined based on the priority between the monitoring of the LP-WUS and the operation of the cell DTX.

[0105] The validity of the LP-WUS MO can be determined based on a threshold value for the overlapping time or ratio of the DRX active time and the cell DTX active time that can be indicated in the LP-WUS MO.

[0106] Method 1: Method for Determining the Validity of LP-WUS Monitoring Opportunities

[0107] A valid LP-WUS MO that a terminal can expect to monitor or receive from an LP-WUS may include one or more of the following LP-WUSes.

[0108] - When the DRX activation time indicated by the LP-WUS MO completely overlaps with the cell DTX activation period

[0109] - When LP-WUS MO is located within the cell DTX active range

[0110] FIG. 7 illustrates a valid LP-WUS MO. Referring to FIG. 7, LP-WUSs that can be received using LR, DRX active times that can be indicated through the LP-WUSs, and cell DTX active intervals are shown. In FIG. 7, a valid LP-WUS MO is indicated by a solid line, and an invalid LP-WUS MO is indicated by a dotted line.

[0111] If the position on the time axis of the DRX active time that can be indicated in the LP-WUS MO completely overlaps with the cell DTX active period, the LP-WUS MO can be determined to be valid. The LP-WUS MO represented as MO_A in FIG. 7 is located outside the cell DTX active period, but the DRX active time associated with the LP-WUS MO completely overlaps with the cell DTX active period. Therefore, MO_A can be a valid LP-WUS MO. The terminal expects to receive the LP-WUS from MO_A and monitors MO_A.

[0112] A certain gap or offset may be required from the reception of the LP-WUS until the MR operates. This is represented as t1 in FIG. 7. This can be referred to as the transition time from LR to MR, or simply the transition time. t1 may be the preparation time for the terminal to operate as MR while operating as LR. t1 may be a value set by the base station based on the capability of the terminal or based on a capability report. Due to t1, even if the LP-WUS MO is not located within the cell DTX active period, the DRX active time indicated by the LP-WUS received from that MO may completely overlap with the cell DTX active period. Therefore, a valid LP-WUS MO can be determined based on t1 and the start time of the cell DTX active period.

[0113] FIG. 8 illustrates a process in which t1 is calculated from the start time of the cell DTX active period to determine from what point in time a valid LP-WUS MO can begin. Through the cell DTX active period setting and t1, the terminal can know from what point in time to expect reception of the LP-WUS and start monitoring.

[0114] If the LP-WUS MO is located within the cell DTX active period, the terminal can determine the LP-WUS MO as a valid LP-WUS MO. If the LP-WUS MO is located within the cell DTX active period and the DRX active time associated with the LP-WUS MO completely overlaps with the cell DTX active period, the terminal can always recognize the LP-WUS MO as a valid LP-WUS MO. LP-WUS MOs that are close to the end of the cell DTX active period can be determined as valid LP-WUS MOs even if the DRX active time associated with each LP-WUS MO partially overlaps with the cell DTX active period or does not overlap at all. This is because the base station transmitting an LP-WUS within the cell DTX active period may imply that there is information to be transmitted later, and even if the indicated DRX active time is outside the cell DTX active period, the terminal can perform PDCCH monitoring and expect to receive subsequent information.

[0115] An LP-WUS MO that is not a valid LP-WUS MO proposed through Method 1 may be determined to be an invalid LP-WUS MO. The terminal does not expect to monitor or receive LP-WUS from an invalid LP-WUS MO.

[0116] An invalid LP-WUS MO may be an LP-WUS MO corresponding to the following cases.

[0117] - When the LP-WUS MO is located outside the cell DTX active period, and the DRX active time that can be indicated by the LP-WUS MO does not overlap with the cell DTX active period at all

[0118] Method 2: How to Set Validity for LP-WUS Monitoring Opportunities

[0119] The validity of the LP-WUS MO can be determined by a preset standard. As in the proposed method 1 above, in addition to cases where the DRX active time completely overlaps with the cell DTX active time or does not overlap at all, cases where it partially overlaps may occur. When the LP-WUS MO is intended to indicate a DRX active time that partially overlaps with the cell DTX active time, the validity of the LP-WUS MO can be set and / or indicated to the terminal.

[0120] An LP-WUS MO for indicating a DRX active time that partially overlaps with a cell DTX active time can be set to be valid. A valid LP-WUS MO can be determined based on the length (t2) and transition time (t1) of a timer (e.g., onDuration timer or a new timer) that starts the first DRX active time. In other words, since the LP-WUS MO is valid from a time point t1+t2 prior to the start of the cell DTX active time, the terminal can perform LP-WUS monitoring on the LP-WUS MO after that time point.

[0121] FIG. 9 illustrates the length of a timer (e.g., onDuration timer or a new timer) that starts the first DRX active time and a transition time (t1) calculated from the start of the cell DTX active period, showing from what point in time the LP-WUS MO is valid. The terminal can know from what point in time to expect reception of the LP-WUS and start monitoring through the cell DTX active period setting, t1, and DRX active time setting.

[0122] Since the LP-WUS MO for indicating a DRX active time that partially overlaps with the cell DTX active time is valid, the LP-WUS MO for indicating a DRX active time that does not completely overlap with the cell DTX active time can be set as invalid. Based on the end time of the cell DTX active time and t1, an invalid LP-WUS MO can be determined. Since the LP-WUS MO is invalid from a point t1 earlier than the end time of the cell DTX active time, the terminal may not perform LP-WUS monitoring on the LP-WUS MO after that point. Since the LP-WUS MO is valid up to a point t1 earlier than the end time of the cell DTX active time, the terminal may perform LP-WUS monitoring on the LP-WUS MO before that point.

[0123] FIG. 10 illustrates the length of a timer (e.g., onDuration timer or a new timer) that starts the initial DRX active time and t1, which is calculated from the end point of the cell DTX active period, and at what point the LP-WUS MO is not valid. The terminal can determine at what point the monitoring of the LP-WUS will not be performed through the cell DTX active period setting, t1, and DRX active time setting.

[0124] An LP-WUS MO indicating a DRX active time that partially overlaps with a cell DTX active time can be set as invalid. Therefore, an LP-WUS MO can be set as valid only when the cell DTX active time and the DRX active time completely overlap. This may be the same as the case in Method 1 where an LP-WUS MO is valid only when the DRX active time completely overlaps with the cell DTX active time.

[0125] FIG. 11 illustrates the determination of validity of an LP-WUS MO when the end time of the cell DTX active period and the end time of the DRX active period are close. Since an LP-WUS MO intended to indicate a DRX active period that partially overlaps with the cell DTX active period is invalid, an invalid LP-WUS MO can be determined based on the length (t2) of the timer that starts the first DRX active period (e.g., onDuration timer or a new timer) and t1. Since the LP-WUS MO is invalid from the time point t1+t2 prior to the end time of the cell DTX active period, the terminal may not perform LP-WUS monitoring from the LP-WUS MO after that time point. Since the LP-WUS MO is valid from the time point t1+t2 prior to the end time of the cell DTX active period, the terminal may perform LP-WUS monitoring up to the LP-WUS MO prior to that time point.

[0126] The validity of an LP-WUS MO indicating a DRX active time that partially overlaps with a cell DTX active time may depend on the priority settings of LP-WUS monitoring and cell DTX operation. If LP-WUS monitoring is set to have a higher priority than cell DTX operation, this may be equivalent to setting an LP-WUS MO indicating a DRX active time that partially overlaps with a cell DTX active time as valid. If cell DTX operation is set to have a higher priority than LP-WUS monitoring, this may be equivalent to setting an LP-WUS MO indicating a DRX active time that partially overlaps with a cell DTX active time as invalid. In other words, even if the validity of an LP-WUS MO indicating a DRX active time that partially overlaps with a cell DTX active time is not directly set, if the priorities of LP-WUS monitoring and cell DTX operation can be set, the terminal may operate accordingly.

[0127] Method 3: Method for determining the validity of LP-WUS monitoring opportunities based on the overlap between DRX active time and cell DTX active time.

[0128] The validity of the LP-WUS MO can be determined based on a threshold value for the time (or ratio thereof) during which the DRX active time and the cell DTX active period overlap (which can be indicated based on the LP-WUS MO). Depending on whether the time (or ratio thereof) during which the cell DTX active period and the DRX active time overlap is greater or smaller than the threshold value, the terminal can determine whether to perform LP-WUS monitoring in the corresponding MO. The DRX active time described in Method 3 refers to the DRX active time that can be started by the terminal that has received a wake-up instruction from the LP-WUS. In other words, it may refer to the operating period of a timer (e.g., an onDuration timer or a new timer) that starts the first DRX active time.

[0129] FIG. 12 is a diagram showing the time (or ratio thereof) during which the cell DTX active period and the DRX active period overlap. Referring to FIG. 12, the operating period of the DRX active period that can be initiated by the LP-WUS or the timer that initiates the first DRX active period (e.g., onDuration timer or new timer) may be represented as t_a, and the time during which the cell DTX active period and the DRX active period overlap may be represented as t_b. The ratio of the time during which the cell DTX active period and the DRX active period overlap may be represented as 't_b / t_a'. The validity of the LP-WUS MO indicating the DRX active period overlapping with the cell DTX active period can be determined as follows.

[0130] - If t_b is greater than or equal to X ms, or if 't_b / t_a' is greater than or equal to Y%, the LP-WUS MO indicating the DRX active time of the time interval given by t_b can be determined to be valid. Here, X and Y may represent threshold values ​​in units of time and percentage, respectively.

[0131] In addition, validity may be determined based on the time or ratio during which the cell DTX activation period and the DRX activation period do not overlap.

[0132] - If 't_a - t_b', which is a time that does not overlap with the cell DTX active interval, is greater than or equal to X ms, or if '(t_a - t_b) / t_a' is greater than or equal to Y%, the LP-WUS MO indicating the DRX active time of the time interval given by t_b may be determined to be invalid. Here, X and Y may represent threshold values ​​in units of time and percentage, respectively.

[0133] It is evident that the examples of the proposed methods described above can also be included as one of the implementation methods and thus can be regarded as a type of proposed method. Furthermore, while the proposed methods described above may be implemented independently, they may also be implemented in the form of a combination (or merger) of some proposed methods. Rules may be defined so that information regarding the application of the proposed methods (or information regarding the rules of the proposed methods) is communicated by a base station to a terminal or by a transmitting terminal to a receiving terminal via a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0134] Implementation example

[0135] FIG. 13 is a flowchart according to one embodiment.

[0136] Referring to FIG. 13, one embodiment based on the methods of the present specification may be a method comprising: receiving first configuration information for a cell DTX / DRX and receiving second configuration information for a WUS (S1301); and monitoring the WUS based on the first configuration information and the second configuration information (S1303). Additionally, a corresponding method may be included in the embodiment, comprising: transmitting first configuration information for a cell DTX / DRX and transmitting second configuration information for a WUS (S1301); and transmitting the WUS based on the first configuration information and the second configuration information (S1303).

[0137] The WUS of FIG. 13 may be the LP-WUS previously described in this specification. Alternatively, the WUS may be a downlink signal associated with PDCCH monitoring and / or paging monitoring, referred to as a 'specific signal'. Monitoring and reception of the signal may be performed through a first receiver, and configuration information for the signal may be received through a second receiver.

[0138] The first receiver corresponds to a separate receiver (i.e., LR) for receiving LP-WUS, and the second receiver corresponds to the main receiver (i.e., MR). The second receiver may be a receiver for receiving paging signals or control signals for paging signals. Alternatively, the second receiver may be a receiver capable of receiving PDCCH. Although specific names may be changed from LR and MR to others, the first receiver is designed to consume relatively less power than the second receiver. The main receiver may be a receiver of an existing NR system, and even if it is a receiver by a communication system other than an NR system, it may correspond to the main receiver if it is a receiver triggered based on the reception of a signal from another receiver that consumes relatively less power.

[0139] The first receiver and the second receiver may not be physically distinguishable. In the case of an A-IoT (Ambient Internet of Things) device, only the first receiver may be included among the first receiver and the second receiver. If the first receiver and the second receiver are not distinguishable in terms of physical and / or software modules, the WUS and other signals may be distinguished based on the magnitude of the received power of the terminal. In this regard, t1 described above in this specification may mean the time required (for signal processing, etc.) to start the DRX active time from the MO of the WUS (or the start or end time associated with said MO) (without consideration of the switching time between the two receivers).

[0140] Example 1, described above in relation to PDCCH monitoring based on LP-WUS, may be referred to as Option 1-1, and Example 2 as Option 1-2. The new timer described in relation to Example 2 may be referred to, for example, wus-PDCCHMonitoringTimer, lpwus-PDCCH-MonitoringTimer, or a specific timer. In the methods of this specification, the timer that first starts the DRX active time of the terminal may mean drx-onDurationTimer, wus-PDCCHMonitoringTimer, and / or lpwus-PDCCH-MonitoringTimer.

[0141] When both cell DTX and cell DRX are configured, the active interval and period parameters can be applied commonly between the cell DTX and the cell DRX. Therefore, the active / inactive interval pattern of cell DTX and the active / inactive interval pattern of cell DRX can be identical, and consequently, the contents described through cell DTX in this specification can be applied identically even when cell DTX is replaced with cell DRX.

[0142] In step S1301, the terminal can receive first configuration information for the cell DTX / DRX and second configuration information for the WUS from the base station through a transceiver. The first configuration information can be transmitted through CellDTXDRX-Config, which is an upper layer parameter.

[0143] The second configuration information may include information indicating the number of time-frequency resources, periods, offsets, and monitoring occasions (MOs) for receiving the LP-WUS. The first configuration information may be transmitted through the upper layer parameter LPWUS-Config. The PDCCH monitoring trigger operation by the LP-WUS may replace the start of drx-onDurationTimer within the existing connection mode (C-DRX) active time, or may indicate the start of a new timer (e.g., lpwus-PDCCH-MonitoringTimer) to indicate a non-periodic PDCCH monitoring period independently of the C-DRX configuration.

[0144] The terminal performs WUS monitoring in a valid MO according to the validity determined in step S1303.

[0145] Referring to Method 1, as a first criterion for determining validity, assuming that a WUS is received at the WUS MO, if the DRX activation time triggered by the WUS fully overlaps with the cell DTX activation period, the LP-WUS MO can be determined to be valid. In this case, even if the LP-WUS MO itself is located in the cell DTX inactive period and is received in advance, the terminal can monitor the LP-WUS normally because the period during which the actual MR wakes up and operates falls within the base station's active period.

[0146] Referring to Method 1, as a second criterion for determining validity, if the WUS MO is located within the cell DTX active period, the WUS MO can be determined to be valid. Since the fact that a base station transmits a WUS within its cell DTX active period implies a high probability of further transmitting downlink data or control information to the terminal, even if the DRX active time triggered by the WUS of the WUS MO is outside the cell DTX active period, the terminal can treat it as valid and perform monitoring.

[0147] To clarify the temporal criteria for the validity of MO, t1 can be used in the definition of the first and second time points.

[0148] For UE in RRC_IDLE and RRC_INACTIVE configured with LP-WUS, three candidate values ​​for wake-up delay are supported for UE to report via capability signaling, where wake-up delay is defined as the minimum time gap between the LP-WUS reception and MR to start PDCCH monitoring. Alternatively, the minimum time gap may be the minimum time gap between WUS reception and the start of PDCCH monitoring, regardless of whether it is LR or MR. The UE may report several of these minimum time gaps in milliseconds. The above t1 may be a value determined based on this wake-up delay or minimum time gap. Alternatively, the above t1 may be a value determined based on an offset set by the base station in relation to, and / or independently of, the wake-up delay or minimum time interval. The above t1 may be the same as the wake-up delay, minimum time interval, and / or offset, but is not necessarily the same. Since the minimum time interval is the minimum time required for the terminal to monitor the PDCCH after receiving the WUS, to ensure this, t1 may be set to a value greater than the wake-up delay, minimum time interval, and / or offset.

[0149] When the MOs between the first time point and the second time point are called valid MOs, the first time point may be a time point that is t1 ahead of the start time of the cell DTX active period. The terminal can determine that the WUS MOs after the first time point are valid. Through this, the terminal can prepare for MR operation in accordance with the cell DTX active period in which the base station's transmission is activated.

[0150] An invalid monitoring opportunity refers to a period during which the terminal does not perform monitoring because it does not expect reception of the WUS. If the MO is located outside the cell DTX active period (inactive period) and the DRX active time that can be indicated by the MO does not overlap at all with the cell DTX active period, the terminal determines that the MO is invalid.

[0151] Referring to Method 2, the DRX active time and the cell DTX active interval may partially overlap in the time domain.

[0152] If the terminal is configured to consider an MO that causes partial overlap as valid, the terminal can determine a first time point and a second time point based on t2 and / or t1.

[0153] The above t2 may be a setting value of the terminal's drx-onDurationTimer or correspond to a setting value of lpwus-PDCCH-MonitoringTimer. When an MO that causes partial overlap is set to be valid, the end point of the DRX active time may be located at the start point of the cell DTX active period; therefore, the terminal sets a time point that is earlier than the start point of the cell DTX active period by the sum of t1 and t2 as the first time point, determines that the MO located after that time point is valid, and performs monitoring. When an MO that causes partial overlap is set to be valid, the start point of the DRX active time may be located at the end point of the cell DTX active period; therefore, the terminal sets a time point that is earlier than the end point of the cell DTX active period by t1 as the second time point, determines that the MO located before that time point is valid, and performs monitoring.

[0154] When an MO that causes partial overlap is set to be invalid, the end point of the DRX active time must be located before the end point of the cell DTX active period. Therefore, the terminal sets the time point that is earlier than the end point of the cell DTX active period by the sum of t1 and t2 as the second time point, determines the MO located before that time point as valid, and performs monitoring.

[0155] Whether an MO causing partial overlap is valid can be determined based on the length of the time interval in which the cell DTX activation interval and the DRX activation time overlap, as disclosed in Method 3. Specific determination factors and threshold values ​​may be referenced in Method 3.

[0156] Alternatively, whether an MO causing partial overlap is valid may be determined based on the priority between the cell DTX / DRX setting and the terminal's DRX setting. For example, if the priority of the cell DTX / DRX setting is higher, the MO causing partial overlap is determined to be invalid, and if the priority of the terminal's DRX setting is higher, the MO causing partial overlap is determined to be valid.

[0157] If only a part of the MO is located between the first and second time points, the entire MO may be determined to be valid or invalid, or partial monitoring may be performed only on the symbols belonging to the valid interval.

[0158] The embodiments described above are combinations of the components and features of the present disclosure in a specific form. Each component or feature should be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, it is possible to construct embodiments of the present disclosure by combining some components and / or features. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that embodiments may be constructed by combining claims that are not explicitly related in the claims, or that they may be included as new claims by amendment after filing.

[0159] It is obvious to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the features of the present disclosure. Accordingly, the foregoing detailed description should not be interpreted restrictively in all respects and should be considered exemplary. The scope of the present disclosure shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure are included within the scope of the present disclosure.

[0160] As described above, the embodiments of this specification can be applied to various wireless communication systems.

Claims

1. Regarding the method, A step of receiving first configuration information for cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and receiving second configuration information for WUS (Wake-Up Signal); The method includes the step of monitoring the WUS based on the first setting information and the second setting information. Based on the fact that the cell DTX active period based on the first setting information overlaps with the terminal's DRX active time, among the WUS monitoring opportunities based on the second setting information, the WUS monitoring opportunity between the first time point and the second time point is determined to be valid, and Monitoring of the WUS is performed during the above valid monitoring opportunity, method.

2. In Paragraph 1, The above first time point is a time point t1 ahead of the starting point of the cell DTX activation period, and The above t1 is a time interval set based on the minimum time interval between WUS reception and the start of PDCCH monitoring, which is reported as terminal capability, method.

3. In Paragraph 1, The above first time point is a time point preceding the starting point of the cell DTX activation interval by the sum of t1 and t2, and The above t1 is a time interval set based on the minimum time interval between WUS reception and the start of PDCCH monitoring, reported as terminal capability, and The above t2 is the length of the timer associated with the start of the DRX activation time, method.

4. In Paragraph 1, The above second time point is a time point t1 ahead of the end point of the cell DTX activation period, and The above t1 is a time interval set based on the minimum time interval between WUS reception and the start of PDCCH monitoring, which is reported as terminal capability, method.

5. In Paragraph 1, The above second point in time is the end point of the cell DTX activation period, method.

6. In Paragraph 1, The second time point is a time point preceding the end point of the cell DTX activation period by the sum of t1 and t2, and The above t1 is a time interval set based on the minimum time interval between WUS reception and the start of PDCCH monitoring, reported as terminal capability, and The above t2 is the length of the timer associated with the start of the DRX activation time, method.

7. In Paragraph 1, The first time point or the second time point is determined based on whether the DRX activation time, which partially overlaps with the cell DTX activation period, is valid, method.

8. In Paragraph 1, Whether the DRX activation time that partially overlaps with the cell DTX activation period is valid is determined based on the length of the time interval in which the cell DTX activation period and the DRX activation time overlap, method.

9. In the device, At least one processor; and It includes at least one memory connected to the at least one processor to be operable, and storing instructions that cause the at least one processor to perform a specific operation when executed. The above specific operation is: A step of receiving first configuration information for cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and receiving second configuration information for WUS (Wake-Up Signal); The method includes the step of monitoring the WUS based on the first setting information and the second setting information. Based on the fact that the cell DTX active period based on the first setting information overlaps with the terminal's DRX active time, among the WUS monitoring opportunities based on the second setting information, the WUS monitoring opportunity between the first time point and the second time point is determined to be valid, and Monitoring of the WUS is performed during the above valid monitoring opportunity, device.

10. In Paragraph 9, The above device is a terminal comprising at least one transceiver or a processor for controlling the terminal, device.

11. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, wherein the operation is: A step of receiving first configuration information for cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and receiving second configuration information for WUS (Wake-Up Signal); The method includes the step of monitoring the WUS based on the first setting information and the second setting information. Based on the fact that the cell DTX active period based on the first setting information overlaps with the terminal's DRX active time, among the WUS monitoring opportunities based on the second setting information, the WUS monitoring opportunity between the first time point and the second time point is determined to be valid, and Monitoring of the WUS is performed during the above valid monitoring opportunity, Storage medium.

12. Regarding the method, A step of transmitting first configuration information for cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and transmitting second configuration information for WUS (Wake-Up Signal); The method includes the step of transmitting the WUS based on the first setting information and the second setting information. Based on the fact that the cell DTX active period based on the first setting information overlaps with the terminal's DRX active time, among the WUS monitoring opportunities based on the second setting information, the WUS monitoring opportunity between the first time point and the second time point is determined to be valid, and In the above valid monitoring opportunity, the transmission of the WUS is performed, method.

13. In the device, At least one processor; and It includes at least one memory connected to the at least one processor to be operable, and storing instructions that cause the at least one processor to perform a specific operation when executed. The above specific operation is: A step of transmitting first configuration information for cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) and transmitting second configuration information for WUS (Wake-Up Signal); The method includes the step of transmitting the WUS based on the first setting information and the second setting information. Based on the fact that the cell DTX active period based on the first setting information overlaps with the terminal's DRX active time, among the WUS monitoring opportunities based on the second setting information, the WUS monitoring opportunity between the first time point and the second time point is determined to be valid, and In the above valid monitoring opportunity, the transmission of the WUS is performed, device.

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