Method for receiving downlink signal, user equipment, processing device, storage medium, method for transmitting downlink signal, and base station

Abstract

A plurality of DRX configurations associated with respective different resources with respect to at least one of the frequency domain, time domain, spatial domain, and power domain may be provided to the UE by the BS. If the BS indicates one of the plurality of DRX configurations, the BS and UE may operate using frequency domain, time domain, spatial domain, or power domain resources associated with the indicated DRX configuration.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system. Background Art

[0002] Various technologies such as machine-to-machine (M2M) communication, machine-type communication (MTC), and various devices requiring high data throughput (e.g., smart phones and tablet personal computers (PCs)) have emerged and become popular. Therefore, the data throughput required to be processed in cellular networks has increased rapidly. In order to meet this rapidly increasing data throughput, carrier aggregation technology or cognitive radio technology for effectively using more frequency bands and multiple input multiple output (MIMO) technology or multiple base station (BS) cooperation technology for increasing the data capacity transmitted on limited frequency resources have been developed.

[0003] As more and more communication devices require greater communication capacity, enhanced mobile broadband (eMBB) communication is needed relative to traditional radio access technology (RAT). In addition, massive machine type communication (mMTC), which provides various services anytime and anywhere by connecting multiple devices and objects to each other, is a major issue to be considered in next-generation communications.

[0004] Discussions are also underway to design communication systems that take into account services / user equipment (UE) that are sensitive to reliability and latency. Discussions are also underway to introduce next generation RATs that take into account eMBB communications, mMTC, ultra-reliable low latency communications (URLLC), etc.

[0005] As the number of services / user equipments (UEs) that a network needs to support increases rapidly, there is an increasing demand for not only UE power saving but also network power saving. Summary of the invention

[0006] Technical issues

[0007] One object of the present disclosure is to provide a method and process for network energy saving.

[0008] Another object of the present disclosure is to provide a method and process for sending a downlink signal to achieve network energy saving.

[0009] The objects to be achieved by using the present disclosure are not limited to those specifically described above, and other objects not described herein will be more clearly understood by those skilled in the art from the following detailed description.

[0010] Technical Solution

[0011] In one aspect of the present disclosure, a method for receiving a downlink signal by a user equipment (UE) in a wireless communication system is provided herein. The method comprises the following steps: detecting a synchronization signal block (SSB) on a cell, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); acquiring time and frequency synchronization with the cell based on the SSB; receiving multiple discontinuous reception (DRX) configurations; and performing physical downlink control channel (PDCCH) monitoring during an active time according to the first DRX configuration based on receiving a first group of common downlink signals indicating a first DRX configuration related to the cell among multiple DRX configurations. Multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain, or power domain.

[0012] In another aspect of the present disclosure, a UE configured to receive downlink signals in a wireless communication system is provided herein. The UE includes: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which, when executed, cause the at least one processor to perform operations. The operations include: detecting SSBs on a cell, wherein the SSBs include PSSs, SSSs, and PBCHs; acquiring time and frequency synchronization with the cell based on the SSBs; receiving multiple DRX configurations; and performing PDCCH monitoring during an active time according to the first DRX configuration based on receiving a first group of common downlink signals indicating a first DRX configuration related to the cell among multiple DRX configurations. Multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, the time domain, the space domain, or the power domain.

[0013] In another aspect of the present disclosure, a processing device is provided herein. The processing device includes: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which, when executed, cause the at least one processor to perform operations. The operations include: detecting SSBs on a cell, wherein the SSBs include PSSs, SSSs, and PBCHs; acquiring time and frequency synchronization with the cell based on the SSBs; receiving multiple DRX configurations; and performing PDCCH monitoring during an active time according to the first DRX configuration based on receiving a first group of common downlink signals indicating a first DRX configuration related to the cell among multiple DRX configurations. Multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, the time domain, the space domain, or the power domain.

[0014] In another aspect of the present disclosure, a computer-readable storage medium is provided herein, which is configured to store at least one program code including instructions, which, when executed, cause at least one processor to perform operations. The operations include: detecting SSB on a cell, wherein the SSB includes PSS, SSS, and PBCH; acquiring time and frequency synchronization with the cell based on the SSB; receiving multiple DRX configurations; and performing PDCCH monitoring during an active time according to the first DRX configuration based on receiving a first group of common downlink signals indicating a first DRX configuration related to the cell among the multiple DRX configurations. The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, the time domain, the space domain, or the power domain.

[0015] In another aspect of the present disclosure, a method for transmitting a downlink signal by a base station (BS) to a UE in a wireless communication system is provided herein. The method comprises the following steps: transmitting an SSB on a cell, wherein the SSB includes a PSS, an SSS, and a PBCH; transmitting multiple DRX configurations; and transmitting a PDCCH during an active time according to the first DRX configuration based on transmitting a first group of common downlink signals indicating a first DRX configuration related to the cell among the multiple DRX configurations. The multiple DRX configurations are respectively associated with different resources in at least one of a frequency domain, a time domain, a space domain, or a power domain.

[0016] In another aspect of the present disclosure, a BS configured to send a downlink signal to a UE in a wireless communication system is provided herein. The BS includes: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which, when executed, cause the at least one processor to perform operations. The operations include: sending an SSB on a cell, wherein the SSB includes a PSS, an SSS, and a PBCH; sending multiple DRX configurations; and sending a PDCCH during an active time according to the first DRX configuration based on sending a first group of common downlink signals indicating a first DRX configuration related to the cell among multiple DRX configurations. The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, the time domain, the space domain, or the power domain.

[0017] In various aspects of the present disclosure, the plurality of DRX configurations may include a DRX configuration associated with a BWP different from a BWP associated with the first DRX configuration.

[0018] In various aspects of the present disclosure, the plurality of DRX configurations may include a DRX configuration associated with a time domain on / off pattern different from a time domain on / off pattern associated with the first DRX configuration.

[0019] In various aspects of the present disclosure, the plurality of DRX configurations may include DRX configurations associated with a number of antenna ports that is different from a number of antenna ports associated with the first DRX configuration.

[0020] In various aspects of the disclosure, the plurality of DRX configurations may include a DRX configuration associated with a power parameter different from a power parameter associated with the first DRX configuration.

[0021] In various aspects of the present disclosure, a method or operation of the UE may include performing overlapping downlink reception or uplink transmission even if downlink reception or uplink transmission configured to be repeatedly performed overlaps with an inactive time according to a first DRX configuration.

[0022] In various aspects of the present disclosure, the method or operation of the UE may include: receiving a configuration related to a network energy saving mode; and skipping the overlapping downlink reception or uplink transmission based on the downlink reception or uplink transmission configured to be repeatedly performed overlapping with the time period for the network energy saving mode.

[0023] In various aspects of the present disclosure, the method or operation of the UE may include: receiving a configuration related to a network energy saving mode; and performing overlapping downlink reception or uplink transmission based on the downlink reception or uplink transmission overlapping with the time period for the network energy saving mode being scheduled by the DCI format.

[0024] In various aspects of the present disclosure, a method or operation of the BS may include performing overlapping downlink transmission or uplink reception even if downlink transmission or uplink reception configured to be repeatedly performed overlaps with an inactive time according to a first DRX configuration.

[0025] In various aspects of the present disclosure, the method or operation of the BS may include: sending a configuration related to a network energy saving mode; and skipping the overlapping downlink transmission or uplink reception based on the downlink transmission or uplink reception configured to be repeatedly performed overlapping with the time period for the network energy saving mode.

[0026] In various aspects of the present disclosure, the method or operation of the BS may include: sending a configuration related to a network energy saving mode; and performing overlapping downlink transmission or uplink reception based on the downlink transmission or uplink reception overlapping with the time period for the network energy saving mode being scheduled by the DCI format.

[0027] The above solutions are only some examples of the present disclosure, and those skilled in the art can deduce and understand various examples into which the technical features of the present disclosure are incorporated from the following detailed description.

[0028] Beneficial Effects

[0029] According to implementations of the present disclosure, energy saving methods and processes for a network, a base station (BS) and / or a user equipment (UE) may be provided.

[0030] According to an implementation of the present disclosure, a method and process for transmitting a downlink signal may be provided to achieve energy saving of a network, a BS and / or a UE.

[0031] Effects according to the present disclosure are not limited to those specifically described above, and other effects not described herein will be more clearly understood by those skilled in the art to which the present disclosure relates from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are included to provide a further understanding of the present disclosure, and illustrate examples of implementations of the present disclosure and together with the detailed description serve to explain the implementations of the present disclosure:

[0033] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown;

[0034] Figure 2 is a block diagram illustrating an example of a communication device capable of executing the method according to the present disclosure;

[0035] Figure 3 Another example of a wireless device capable of performing implementations of the present disclosure is shown;

[0036] Figure 4 An example of a frame structure used in a wireless communication system based on the 3rd Generation Partnership Project (3GPP) is shown;

[0037] Figure 5 a resource grid showing time slots;

[0038] Figure 6 Showing physical channels in a 3rd Generation Partnership Project (3GPP)-based communication system as an exemplary wireless communication system and a signal transmission / reception process using the physical channels;

[0039] Figure 7 Shows the system information (SI) acquisition process;

[0040] Figure 8 A random access procedure applicable to an implementation of the present disclosure is shown;

[0041] Fig. 9 An example of physical downlink shared channel (PDSCH) time domain resource assignment (TDRA) over a physical downlink control channel (PDCCH) and an example of physical uplink shared channel (PUSCH) TDRA over the PDCCH are shown;

[0042] Fig.10Shows SSB and CORESET multiplexing patterns;

[0043] Fig.11 illustrates discontinuous reception (DRX) operations suitable for implementations of the present disclosure;

[0044] Fig.12 The configuration of a long DRX cycle and a short DRX cycle is shown;

[0045] Fig.13 and Fig.14 Showing energy saving methods according to some implementations of the present disclosure;

[0046] Fig.15 A flow chart showing a downlink (DL) signal reception process by a user equipment (UE) according to some implementations of the present disclosure; and

[0047] Fig.16 A flow of DL signal transmission by a base station (BS) according to some implementations of the present disclosure is shown. DETAILED DESCRIPTION

[0048] Hereinafter, implementations according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to illustrate exemplary implementations of the present disclosure, rather than to show the only implementations that can be implemented according to the present disclosure. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure can be practiced without these specific details.

[0049] In some cases, known structures and devices may be omitted or may be shown in block diagram form, thereby focusing on important features of the structures and devices so as not to obscure the concepts of the present disclosure. The same reference numerals will be used throughout the present disclosure to refer to the same or similar parts.

[0050] The following techniques, devices and systems can be applied to various wireless multiple access systems. For example, multiple access systems may include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, multi-carrier frequency division multiple access (MC-FDMA) systems, etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Enhanced Data Rate for GSM Evolution (EDGE) (i.e., GERAN), etc. OFDMA can be specifically implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS), and 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA. 3GPP LTE adopts OFDMA on downlink (DL) and SC-FDMA on uplink (UL). LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.

[0051] For the convenience of description, the description will be given under the assumption that the present disclosure is applied to LTE and / or new RAT (NR). However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP LTE / NR system, the mobile communication system is applicable to any other mobile communication system except for matters specific to the 3GPP LTE / NR system.

[0052] For terms and techniques used in the present disclosure that are not described in detail, reference may be made to standard specifications based on 3GPP (for example, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.304, 3GPP TS 38.331, etc.).

[0053] In an example of the present disclosure described later, if a device "assumes" something, this may mean that a channel transmission entity transmits a channel in accordance with the corresponding "assumption". This may also mean that a channel reception entity receives or decodes a channel in a form that conforms to the "assumption" under the premise that the channel is transmitted in accordance with the "assumption".

[0054] In the present disclosure, a user equipment (UE) may be fixed or mobile. Each of the various devices that transmit and / or receive user data and / or control information by communicating with a base station (BS) may be a UE. The term UE may be referred to as a terminal device, a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), a wireless modem, a handheld device, etc. In the present disclosure, a BS refers to a fixed station that communicates with a UE and / or another BS and exchanges data and control information with the UE and another BS. The term BS may be referred to as an advanced base station (ABS), a node B (NB), an evolved node B (eNB), a base transceiver system (BTS), an access point (AP), a processing server (PS), etc. Specifically, a BS of a universal terrestrial radio access (UTRAN) is referred to as an NB, a BS of an evolved UTRAN (E-UTRAN) is referred to as an eNB, and a BS of a new radio access technology network is referred to as a gNB. In the following, for the convenience of description, NB, eNB or gNB will be referred to as a BS regardless of the type or version of the communication technology.

[0055] In the present disclosure, a node refers to a fixed point that can send / receive a radio signal to / from a UE by communicating with the UE. Regardless of its name, various types of BSs can be used as nodes. For example, a BS, NB, eNB, picocell eNB (PeNB), home eNB (HeNB), repeater, transponder, etc. can be a node. In addition, a node may not be a BS. For example, a radio remote head (RRH) or a radio remote unit (RRU) can be a node. Typically, RRH and RRU have a power level lower than that of the BS. Since the RRH or RRU (hereinafter, RRH / RRU) is usually connected to the BS via a dedicated line such as an optical cable, the collaborative communication according to the RRH / RRU and the BS can be smoothly performed compared to the collaborative communication according to the BS connected via a wireless link. At least one antenna is installed per node. The antenna may refer to a physical antenna port or to a virtual antenna or an antenna group. A node may also be referred to as a point.

[0056] In the present disclosure, a cell refers to a specific geographical area where one or more nodes provide communication services. Therefore, in the present disclosure, communication with a specific cell may mean communication with a BS or node that provides communication services to a specific cell. The DL / UL signal of a specific cell refers to the DL / UL signal from / to the BS or node that provides communication services to the specific cell. A cell that provides UL / DL communication services to a UE is particularly referred to as a service cell. In addition, the channel state / quality of a specific cell refers to the channel state / quality of a channel or communication link generated between a BS or node that provides communication services to a specific cell and the UE. In a 3GPP-based communication system, a UE can use a CRS sent on a cell-specific reference signal (CRS) resource and / or a CSI-RS sent on a channel state information reference signal (CSI-RS) resource (allocated to a specific node by an antenna port of a specific node) to measure the DL channel state from a specific node.

[0057] The 3GPP-based communication system uses the concept of a cell in order to manage radio resources, and distinguishes a cell related to radio resources from a cell of a geographical area.

[0058] A "cell" of a geographic area may be understood as a coverage area in which a node can use a carrier to provide services, and a "cell" of radio resources is associated with a bandwidth (BW) which is a frequency range configured by a carrier. Since the DL coverage (the range in which a node can send a valid signal) and the UL coverage (the range in which a node can receive a valid signal from a UE) depend on the carrier that carries the signal, the coverage of a node may also be associated with the coverage of a "cell" of radio resources used by the node. Therefore, the term "cell" may be used to indicate the service coverage of a node at times, to indicate a radio resource at other times, or to indicate a range that a signal using a radio resource can reach with effective strength at other times.

[0059] In the 3GPP communication standard, the concept of a cell is used to manage radio resources. A "cell" associated with a radio resource is defined by a combination of DL resources and UL resources (i.e., a combination of DL component carriers (CCs) and UL CCs). A cell may be configured only by DL resources, or by a combination of DL resources and UL resources. If carrier aggregation is supported, the link between the carrier frequency of a DL resource (or DL ​​CC) and the carrier frequency of a UL resource (or UL CC) may be indicated by system information. For example, the combination of DL resources and UL resources may be indicated by a system information block type 2 (SIB2) link. In this case, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When carrier aggregation (CA) is configured, the UE has only one radio resource control (RRC) connection with the network. During RRC connection establishment / reestablishment / handover, one serving cell provides non-access layer (NAS) mobility information. During RRC connection reestablishment / handover, one serving cell provides security input. The cell is called a primary cell (Pcell). Pcell refers to a cell operating on the primary frequency where the UE performs an initial connection establishment process or initiates a connection reestablishment process. According to the UE capabilities, the secondary cell (Scell) can be configured to form a set of serving cells together with the Pcell. The Scell ​​can be configured after the RRC connection establishment is completed and is used to provide additional radio resources in addition to the resources of the specific cell (SpCell). The carrier corresponding to the Pcell on the DL is called the downlink primary CC (DL PCC), and the carrier corresponding to the Pcell on the UL is called the uplink primary CC (UL PCC). The carrier corresponding to the Scell ​​on the DL is called the downlink secondary CC (DL SCC), and the carrier corresponding to the Scell ​​on the UL is called the uplink secondary CC (UL SCC).

[0060] In dual connectivity (DC) operation, the term special cell (SpCell) refers to a Pcell of a primary cell group (MCG) or a primary secondary cell (Pcell) of a secondary cell group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always enabled. MCG is a group of service cells associated with a master node (e.g., BS) and includes SpCell (Pcell) and optionally one or more Scells. For a UE configured with DC, SCG is a subset of the service cells associated with the secondary node and includes PSCell and 0 or more Scells. PSCell is the primary Scell ​​of the SCG. For a UE in RRC_CONNECTED state that is not configured with CA or DC, there is only one service cell that includes only Pcell. For a UE in RRC_CONNECTED state that is configured with CA or DC, the term service cell refers to a set of cells including SpCell and all Scells. In DC, two medium access control (MAC) entities are configured for the UE, i.e., one MAC entity for MCG and one MAC entity for SCG.

[0061] For a UE configured with CA but not configured with DC, a Pcell PUCCH group (also referred to as a primary PUCCH group) including a Pcell and 0 or more Scells and a Scell ​​PUCCH group (also referred to as a secondary PUCCH group) including only Scells may be configured. For an Scell, a Scell ​​(hereinafter, PUCCH Scell) that transmits a PUCCH associated with a corresponding cell may be configured. The Scell ​​indicating that the PUCCH Scell ​​belongs to the Scell ​​PUCCH group (i.e., the secondary PUCCH group) and performs PUCCH transmission of related uplink control information (UCI) on the PUCCH Scell. If the PUCCH Scell ​​is not indicated for the Scell ​​or the cell indicating that the PUCCH transmission for the Scell ​​is the Pcell, the Scell ​​belongs to the Pcell PUCCH group (i.e., the primary PUCCH group) and performs PUCCH transmission of related UCI on the Pcell. In the following, if the UE is configured with an SCG and some implementations of the present disclosure related to PUCCH are applied to the SCG, the primary cell may refer to the PSCell of the SCG. If the UE is configured with a PUCCH Scell ​​and some implementations of the present disclosure related to PUCCH are applied to a secondary PUCCH group, the primary cell may refer to a PUCCH Scell ​​of the secondary PUCCH group.

[0062] In a wireless communication system, a UE receives information from a BS on DL, and a UE transmits information to a BS on UL. The information transmitted and / or received by the BS and the UE includes data and various control information, and there are various physical channels according to the type / purpose of the information transmitted and / or received by the UE and the BS.

[0063] The communication standards based on 3GPP define DL physical channels corresponding to resource elements carrying information from high layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information from high layers. For example, physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), physical multicast channel (PMCH), physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), etc. are defined as DL physical channels, and reference signals (RS) and synchronization signals are defined as DL physical signals. RS (also called pilot) represents a signal with a predefined special waveform known to both BS and UE. For example, demodulation reference signal (DMRS), channel state information RS (CSI-RS), positioning reference signal (PRS), etc. are defined as DL RS. The communication standards based on 3GPP define UL physical channels corresponding to resource elements carrying information from high layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information from high layers. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are defined as UL physical channels, and a DMRS for UL control / data signals, a sounding reference signal (SRS) for UL channel measurement, etc. are defined.

[0064] In the present disclosure, PDCCH refers to a set of time-frequency resources (e.g., resource elements (REs)) carrying downlink control information (DCI), and PDSCH refers to a set of time-frequency resources carrying DL data. PUCCH, PUSCH, and PRACH refer to a set of time-frequency resources carrying UCI, a set of time-frequency resources carrying UL data, and a set of time-frequency resources carrying random access signals, respectively. In the following description, "UE sends / receives PUCCH / PUSCH / PRACH" is used as the same meaning as the UE sends / receives UCI / UL data / random access signals on PUCCH / PUSCH / PRACH or through PUSCH / PUCCH / PRACH, respectively. In addition, "BS sends / receives PBCH / PDCCH / PDSCH" is used as the same meaning as the BS sends broadcast information / DCI / DL data on PBCH / PDCCH / PDSCH or through PBCH / PDCCH / PDSCH, respectively.

[0065] In the present specification, radio resources (eg, time-frequency resources) scheduled or configured by a BS for a UE to transmit or receive a PUCCH / PUSCH / PDSCH may be referred to as PUCCH / PUSCH / PDSCH resources.

[0066] Since the communication device receives a synchronization signal (SS), DMRS, CSI-RS, PRS, PBCH, PDCCH, PDSCH, PUSCH and / or PUCCH in the form of a radio signal on a cell, the communication device may not select and receive a radio signal including only a specific physical channel or a specific physical signal through a radio frequency (RF) receiver, or may not select and receive a radio signal without a specific physical channel or a specific physical signal through an RF receiver. In actual operation, the communication device receives a radio signal on a cell via an RF receiver, converts the radio signal as an RF band signal into a baseband signal, and then uses one or more processors to decode the physical signal and / or physical channel in the baseband signal. Therefore, in some implementations of the present disclosure, not receiving a physical signal and / or a physical channel may mean that the communication device does not attempt to recover the physical signal and / or the physical channel from the radio signal, for example, does not attempt to decode the physical signal and / or the physical channel, rather than the non-communication device actually receiving a radio signal including the corresponding physical signal and / or the physical channel.

[0067] As more and more communication devices require greater communication capacity, eMBB communication relative to traditional radio access technology (RAT) is needed. In addition, large-scale MTC, which provides various services anytime and anywhere by connecting multiple devices and objects to each other, is a major issue to be considered in the next generation of communications. In addition, the design of communication systems that take into account services / UEs that are sensitive to reliability and delay is also being discussed. Considering eMBB communication, large-scale MTC, ultra-reliable low-latency communication (URLLC), etc., the introduction of the next generation RAT is being discussed. Currently, in 3GPP, research on the next generation mobile communication system after EPC is underway. In this disclosure, for convenience, the corresponding technology is referred to as a new RAT (NR) or a fifth generation (5G) RAT, and a system using NR or supporting NR is referred to as an NR system.

[0068] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown. Figure 1, the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, the wireless device refers to a device that performs communication using a RAT (e.g., 5G NR or LTE (e.g., E-UTRA)), and may be referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include 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) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, BSs and networks may also be implemented as wireless devices, and a specific wireless device may operate as a BS / network node relative to another wireless device.

[0069] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0070] Wireless communication / connection 150a and 150b may be established between wireless devices 100a to 100f and BS200, and between wireless devices 100a to 100f. Here, wireless communication / connection such as UL / DL communication 150a and sidelink communication 150b (or device-to-device (D2D) communication) may be established through various RATs (e.g., 5G NR). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of a resource allocation process may be performed based on various proposals of the present disclosure.

[0071] Figure 2 is a block diagram showing an example of a communication device capable of executing the method according to the present disclosure. Figure 2 , the first wireless device 100 and the second wireless device 200 may transmit and / or receive radio signals through various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 1 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0072] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the functions, processes and / or methods described / proposed below. For example, the processor 102 may process the information in the memory 104 to generate first information / signal, and then transmit a radio signal including the first information / signal through the transceiver 106. The processor 102 may receive a radio signal including second information / signal through the transceiver 106, and then store information obtained by processing the second information / signal in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may execute part or all of the processes controlled by the processor 102 or store software codes including commands for executing the processes and / or methods described / proposed below. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0073] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the functions, processes and / or methods described / proposed below. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals 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, the memory 204 may execute part or all of the processes controlled by the processor 202 or store software codes including commands for executing the processes and / or methods described / proposed below. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0074] The wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may include narrowband Internet of Things for low-power communication as well as LTE, NR and 6G. For example, NB-IoT technology may be an example of low-power wide area network (LPWAN) technology and is implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. However, NB-IoT technology is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices XXX and YYY of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and is referred to as various names including enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented in accordance with at least one of the following various standards: 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, etc., but LTE-M technology is not limited to the above names. Additionally or alternatively, in consideration of low power communication, the wireless communication technology implemented in the wireless devices XXX and YYY of the present disclosure may include at least one of ZigBee, Bluetooth, and LPWAN, but the wireless communication technology is not limited to the above names. For example, ZigBee technology may be based on various standards such as IEEE 802.15.4 to create a personal area network (PAN) related to small / low power digital communication, and ZigBee technology may be referred to as various names.

[0075] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, an SDU, a message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure.

[0076] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The functions, processes, proposals, and / or methods disclosed in the present disclosure may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the functions, processes, proposals, and / or methods disclosed in the present disclosure may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The functions, processes, proposals, and / or methods disclosed in the present disclosure may be implemented using firmware or software in the form of code, commands, and / or command sets.

[0077] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, commands and / or instructions. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0078] One or more transceivers 106 and 206 may send the user data, control information and / or radio signal / channel mentioned in the method and / or operation flow chart of the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information and / or radio signal / channel mentioned in the function, process, proposal, method and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signal to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signal from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. One or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the functional, process, proposal, method and / or operation flow chart disclosed in the present disclosure through one or more antennas 108 and 208. In the present disclosure, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0079] Figure 3 Another example of a wireless device capable of executing implementations of the present disclosure is shown. Figure 3 , the wireless devices 100 and 200 may correspond to Figure 2 The wireless devices 100 and 200 of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 2One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Figure 2 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 may send information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0080] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 1 100a), vehicles ( Figure 1 100b-1 and 100b-2), XR devices ( Figure 1 100c), handheld device ( Figure 1 100d), household appliances ( Figure 1 100e), IoT devices ( Figure 1 100f), digital broadcast UE, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 1 400), BS( Figure 1 200), network nodes, etc. The wireless device can be used in a mobile or fixed location depending on the usage / service.

[0081] exist Figure 3In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM)), a flash memory, a temporary memory, a non-temporary memory and / or a combination thereof.

[0082] In the present disclosure, at least one memory (e.g., 104 or 204) may store instructions or programs, and these instructions or programs, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0083] In the present disclosure, a computer-readable (non-temporary) storage medium may store at least one instruction or program, and when the at least one instruction or program is executed by at least one processor, the at least one processor may cause the at least one processor to perform operations according to some embodiments or implementations of the present disclosure.

[0084] In the present disclosure, a processing device or apparatus may include at least one processor and at least one computer memory operatively connected to the at least one processor. The at least one computer memory may store instructions or programs, and these instructions or programs, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0085] In the present disclosure, a computer program may include program code stored on at least one computer-readable (non-transitory) storage medium, and when executed, it is configured to perform operations according to some implementations of the present disclosure or cause at least one processor to perform operations according to some implementations of the present disclosure. The computer program may be provided in the form of a computer program product. The computer program product may include at least one computer-readable (non-transitory) storage medium.

[0086] The communication device of the present disclosure includes: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and configured to store instructions, which when executed cause the at least one processor to perform operations according to examples of the present disclosure described later.

[0087] Figure 4 An example of a frame structure used in a 3GPP-based wireless communication system is shown.

[0088] Figure 4 The frame structure is only exemplary, and the number of subframes, the number of time slots, and the number of symbols in the frame may be changed differently. In the NR system, different OFDM parameter sets (e.g., subcarrier spacing (SCS)) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of time resources including the same number of symbols (e.g., subframes, time slots, or transmission time intervals (TTIs)) may be configured differently for the aggregated cells. Here, the symbol may include an OFDM symbol (or a cyclic prefix-OFDM (CP-OFDM) symbol) and an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol). In the present disclosure, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols, and DFT-s-OFDM symbols may be used interchangeably.

[0089] Reference Figure 4 In the NR system, UL transmission and DL transmission are organized into frames. Each frame has T f =(△f max *N f / 100)*T c = 10 ms duration and is divided into two half frames of 5 ms each. The basic time unit of NR is T c =1 / (△f max *N f ), where △f max =480*10 3 Hz and N f =4096. For reference, the basic time unit of LTE is T s =1 / (△f ref *N f,ref ), where △f ref =15*10 3 Hz and N f,ref =2048. c and T f With constant κ = T c / T f =64. Each half frame includes 5 subframes, and the duration of a single subframe is T sfThe subframe is further divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on the cyclic prefix. In normal CP, each slot includes 14 OFDM symbols, and in extended CP, each slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing △f=2 u *15kHz. The following table shows the number of OFDM symbols per time slot (N slot symb ), the number of time slots per frame (N frame,u slot ) and the number of time slots per subframe (N subframe,u slot ).

[0090] [Table 1]

[0091] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32 6 14 640 64

[0092] The following table shows the subcarrier spacing △f = 2 u *15kHz, number of OFDM symbols per slot, number of slots per frame and number of slots per subframe.

[0093] [Table 2]

[0094] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 2 12 40 4

[0095] For subcarrier spacing configuration u, the time slots may be indexed in ascending order within a subframe as follows: n u s ∈{0,...,n subframe ,u slot -1}, and are indexed in ascending order within the frame as follows: n u s,f ∈{0,...,n frame,u slot -1}.

[0096] Figure 5 A resource grid of a time slot is shown. A time slot includes multiple (e.g., 14 or 12) symbols in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, a common resource block (CRB) N is indicated by higher layer signaling (e.g., RRC signaling). start,u grid Begins to define N size,u grid,x *N RB sc subcarriers and N subframe,u symb OFDM symbol resource grid, where N size,u grid,xis the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. N RB sc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission link (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u is given to the UE through higher-layer parameters (e.g., RRC parameters) size,u grid . Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing the symbol position relative to a reference point in the time domain. In the NR system, an RB is defined by 12 consecutive subcarriers in the frequency domain. In the NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 of subcarrier spacing configuration u is equal to "point A" used as a common reference point for the RB grid. PRBs for subcarrier spacing configuration u are defined within a bandwidth part (BWP) and are numbered from 0 to N. size,u BWP,i -1 numbering, where i is the number of BWPs. PRB n in BWPi PRB With CRB u CRB The relationship between n u PRB =n u CRB +N size,u BWP,i Given, where N size BWP,i is the CRB at which the BWP starts relative to CRB 0. A BWP includes multiple consecutive RBs in the frequency domain. For example, a BWP may be a CRB with a given parameter set u in BWP i on a given carrier. i A subset of contiguous CRBs defined by the UE. A carrier may include up to N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Data communication is performed through enabled BWPs, and only a predetermined number of BWPs (e.g., one BWP) among the BWPs configured for the UE may be active on the component carrier.

[0097] For each serving cell in the set of DL BWPs or UL BWPs, the network may configure at least an initial DL BWP and one (if the serving cell is configured with uplink) or two (if supplementary uplink is used) initial UL BWPs. The network may configure additional UL and DL BWPs. For each DL BWP or UL BWP, the following parameters may be provided to the UE for the serving cell: i) SCS; ii) CP; iii) start BWP＝ 275 indicates the offset RB set and length L RB CRB N provided as the RRC parameter locationAndBandwidth of the Resource Indicator Value (RIV) start BWP =O carrier +RB start and the number of adjacent RBs N size BWP =L RB , and the value O provided by the RRC parameter offsetToCarrier for SCS carrier ; an index into a set of DL BWP or UL BWP; a set of BWP common parameters; and a set of BWP dedicated parameters.

[0098] Switching between configured BWPs may occur using RRC signaling, DCI and / or inactivity timers or during random access initiation. If an inactivity timer is configured for the serving cell, expiration of the inactivity timer associated with the serving cell causes the active BWP to switch to the default BWP configured by the network.

[0099] Virtual Resource Blocks (VRBs) can be defined within a BWP and are numbered from 0 to N. size,u BWP,i -1 index, where i represents the BWP number. VRBs may be mapped to PRBs according to an interleaved mapping or a non-interleaved mapping. In some implementations, for non-interleaved VRB to PRB mapping, VRB n may be mapped to PRB n.

[0100] NR frequency bands are defined as two types of frequency ranges, namely, FR1 and FR2. FR2 is also known as millimeter wave (mmW). The following table shows the frequency ranges in which NR can operate.

[0101] [Table 3]

[0102] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0103] Figure 6is a diagram showing physical channels in a 3GPP-based communication system as an exemplary wireless communication system and a signal transmission / reception process using the physical channels.

[0104] When the UE is powered on or when the UE has been disconnected from the wireless communication system, the UE searches for a cell to reside in and performs an initial cell search, involving synchronization with a BS in the cell (S11). For the initial cell search, the UE receives a synchronization signal block (SSB) (also called an SS / PBCH block) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as a cell identification (ID). The UE can obtain broadcast information in the cell based on the PBCH. The UE can receive a DL reference signal (RS) during the initial cell search to monitor the DL channel status.

[0105] After the initial cell search, the UE may camp on the cell. Subsequently, the UE may monitor the PDCCH in the cell and acquire more specific system information by receiving the PDSCH based on the DCI carried on the PDCCH (S12).

[0106] Subsequently, in order to complete the connection with the BS, the UE may perform a random access procedure (S13 to S16). In the random access procedure, for example, the UE may send a preamble on the PRACH (S13) and receive a PDCCH and a random access response (RAR) to the preamble on the PDSCH corresponding to the PDCCH (S14). When the UE fails to receive the RAR directed to the UE, the UE may attempt to retransmit the preamble. In the case of contention-based random access, the UE may send a PUSCH based on the UL resource assignment included in the RAR (S15), and perform a contention resolution procedure including reception of the PDCCH and the PDSCH corresponding to the PDCCH (S16).

[0107] After the above process, the UE may receive PDCCH / PDSCH from the BS (S17) and send PUSCH / PUCCH to the BS (S18) during general UL / DL signal transmission. The control information sent by the UE to the BS is generally referred to as uplink control information (UCI). UCI includes hybrid automatic repeat request acknowledgment / negative acknowledgment (HARQ ACK / NACK), scheduling request (SR) and channel state information (CSI). CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI) and / or rank indication (RI). Typically, UCI is sent on PUCCH. However, when control information and data should be sent simultaneously, control information may be sent on PUSCH. In addition, upon receiving a request / command from the network, the UE may send UCI on PUSCH aperiodically.

[0108] Figure 7 The system information (SI) acquisition process is shown. The UE can acquire access stratum / non-access stratum (AS / NAS) information from the SI acquisition process. The SI acquisition process can be applied to UEs in the following states: RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED. RRC_CONNECTED refers to a state in which the UE has established an RRC connection with the network. RRC_IDLE refers to a state in which the UE is not registered in a specific cell and has not received an AS context and other information from the network. RRC_INACTIVE refers to a state in which the UE remains in a state called CM-CONNECTED, in which the UE has a signaling connection with the core network for connection management (CM) and is able to move within an area defined by a radio access network (RAN) (e.g., BS) without notifying the RAN. CM_CONNECTED refers to a state in which the UE has a NAS signaling connection with the core network. CM_IDLE refers to a state in which the UE has no NAS signaling connection.

[0109] In a 3GPP-based system, system information (SI) may be classified into a master information block (MIB) and multiple system information blocks (SIBs). The MIB and multiple SIBs are divided into minimum system information (SI) and other SI, where the minimum SI consists of the MIB and system information block 1 (SIB1), and includes basic information required for initial access and information for acquiring any other SI. SIB1 may be referred to as remaining minimum system information (RMSI). Details are provided below.

[0110] -MIB is always sent on BCH with a periodicity of 80ms and is repeated within 80ms. MIB includes information / parameters related to SIB1 reception and is sent through PBCH in SSB. During initial cell selection, the UE assumes that the half frame including the SSB is repeated with a periodicity of 20ms. The UE can determine whether there is a control resource set (CORESET) for the Type0-PDCCH common search space based on the MIB. The Type0-PDCCH common search space is a PDCCH search space and is used to send a PDCCH that schedules SI messages. When a Type0-PDCCH common search space exists, the UE can determine (i) multiple consecutive RBs and one or more consecutive symbols included in the CORESET and (ii) the PDCCH timing (i.e., the time domain position for PDCCH reception) based on the information in the MIB (e.g., pdcch-ConfigSIB1). When there is no Type0-PDCCH common search space, pdcch-ConfigSIB1 provides information about the frequency position where SSB / SIB1 exists and information about the frequency range where SSB / SIB1 does not exist.

[0111] -SIB1 is sent on the downlink shared channel (DL-SCH) with a periodicity of 160ms and a variable transmission repetition periodicity within 160ms. The default transmission repetition periodicity of SIB1 is 20ms, but the actual transmission repetition periodicity depends on the network implementation. SIB1 includes information about the availability and scheduling (e.g., transmission periodicity and SI window size) of the remaining SIBs (hereinafter referred to as SIBx, where x is an integer greater than or equal to 2). For example, SIB1 may indicate whether SIBx is broadcast periodically or provided on demand at the request of the UE. When SIBx is provided on demand, SIB1 may include the information required by the UE to perform an SI request. SIB1 is a cell-specific SIB. The PDCCH that schedules SIB1 is sent in the Type0-PDCCH common search space, and SIB1 is sent via the PDSCH indicated by the PDCCH.

[0112] -SIBx is included in the SI message and transmitted through the PDSCH. Each SI message is transmitted within a time window (ie, SI window) that occurs periodically.

[0113] Figure 8 The random access process applicable to the implementation of the present disclosure is shown. Specifically, Figure 8 (a) shows a 4-step random access process, Figure 8 (b) shows a 2-step random access process.

[0114] The random access procedure can be used for various purposes, including initial access, UL synchronization adjustment, resource allocation, switching, radio link reconfiguration after radio link failure, and positioning. The random access procedure is classified into a contention-based procedure and a dedicated (i.e., non-contention-based) procedure. The contention-based random access procedure generally involves initial access, while the dedicated random access procedure is used for UL synchronization reconfiguration in the case of switching, DL data arriving at the network, and positioning. In the contention-based random access procedure, the UE randomly selects a random access (RA) preamble. Therefore, multiple UEs may send the same RA preamble at the same time, so a subsequent contention resolution procedure is required. In the dedicated random access procedure, the UE uses the RA preamble uniquely allocated by the BS to the UE. Therefore, the UE can perform a random access procedure without conflicting with other UEs.

[0115] Reference Figure 8 (a) of the present invention, the contention-based random access procedure includes the following four steps. The messages sent in steps 1 to 4 may be referred to as message 1 (Msg1) to message 4 (Msg4), respectively.

[0116] - Step 1: UE sends RA preamble on PRACH.

[0117] - Step 2: The UE receives the RAR from the BS on the PDSCH.

[0118] -Step 3: The UE sends UL data to the BS on the PUSCH. The UL data includes a layer 2 (L2) / layer 3 (L3) message.

[0119] - Step 4: The UE receives a contention resolution message from the BS on the PDSCH.

[0120] The UE may receive random access information from the BS in the system information. For example, information about the RACH timing associated with the SSB on the cell may be provided in the system information. The UE may select an SSB whose reference signal received power (RSRP) measured based on the SSB exceeds a threshold among the SSBs received on the cell. The UE may then send an RA preamble on the PRACH associated with the selected SSB. For example, when the UE requires random access, the UE sends Msg1 (e.g., a preamble) to the BS on the PRACH. The BS may identify each RA preamble by the time / frequency resource (RA timing (RO)) carrying the RA preamble and the preamble index (PI). Upon receiving the RA preamble from the UE, the BS sends a RAR message to the UE on the PDSCH. In order to receive the RAR message, the UE monitors the L1 / L2 control channel (PDCCH) with a cyclic redundancy check (CRC) masked with a random access-RNTI (RA-RNTI) within a preconfigured time window (e.g., ra-ResponseWindow), including scheduling information for the RAR message. When scheduling information is received on the PDCCH masked with RA-RNTI, the UE may receive a RAR message on the PDSCH indicated by the scheduling information. The UE then checks whether there is a RAR pointing to the UE in the RAR message. Whether there is a RAR pointing to the UE can be determined by checking whether there is a random access preamble ID (RAPID) of the preamble sent by the UE. The index of the preamble sent by the UE may be the same as the RAPID. The RAR includes the index of the corresponding RA preamble, the timing offset information of UL synchronization (e.g., timing advance command (TAC)), the UL scheduling information (e.g., UL grant) transmitted by Msg3, and the UE temporary identification information (e.g., temporary-C-RNTI (TC-RNTI)). Upon receiving the RAR, the UE sends Msg3 on the PUSCH according to the UL scheduling information and timing offset value in the RAR. Msg3 may include the ID (or global ID) of the UE. In addition, Msg3 may include RRC connection request related information (e.g., RRCSetupRequest message) for initial access to the network. After receiving Msg3, the BS sends a contention resolution message (i.e., Msg4) to the UE. When the UE receives the contention resolution message and the contention resolution is successful, the TC-RNTI is changed to the C-RNTI. Msg4 may include the ID of the UE / RRC connection related information (e.g., RRCSetup message). When the information sent in Msg3 does not match the information received in Msg4 or when the UE does not receive Msg4 within a predetermined time, the UE may determine that the contention resolution has failed and retransmit Msg3.

[0121] The dedicated random access procedure includes the following three steps. The messages sent in step 0 to step 2 may be referred to as Msg0 to Msg2, respectively. The BS may trigger the dedicated random access procedure through a PDCCH serving the purpose of commanding RA preamble transmission (hereinafter, referred to as a PDCCH command).

[0122] - Step 0: The BS allocates a RA preamble to the UE through dedicated signaling.

[0123] - Step 1: UE sends RA preamble on PRACH.

[0124] - Step 2: The UE receives the RAR from the BS on the PDSCH.

[0125] Step 1 and step 2 of the dedicated random access procedure may be the same as step 1 and step 2 of the contention-based random access procedure.

[0126] NR systems may require lower latency than legacy systems. In particular, for delay-sensitive services such as URLLC, a 4-step random access procedure may not be preferred. Various scenarios in NR systems may require a low-latency random access procedure. When the implementation of the present disclosure is implemented together with a random access procedure, the implementation of the present disclosure may be implemented together with the following 2-step random access procedure to reduce the delay involved in the random access procedure.

[0127] Reference Figure 8 (b), the 2-step random access procedure may be performed in two steps: MsgA transmission from the UE to the BS and MsgB transmission from the BS to the UE. MsgA transmission may include transmission of an RA preamble on the PRACH and transmission of an UL payload on the PUSCH. In MsgA transmission, the PRACH and the PUSCH may be transmitted in time division multiplexing (TDM). Alternatively, in MsgA transmission, the PRACH and the PUSCH may be transmitted in frequency division multiplexing (FDM).

[0128] Upon receiving MsgA, the BS may send MsgB to the UE. MsgB may include the RAR for the UE.

[0129] An RRC connection request related message (e.g., an RRCSetupRequest message) requesting establishment of a connection between the RRC layer of the BS and the RRC layer of the UE may be included in the payload of MsgA. In this case, MsgB may be used to send RRC connection related information (e.g., an RRCSetup message). In contrast, an RRC connection request related message (e.g., an RRCSetupRequest message) may be sent on the PUSCH based on the UL grant in MsgB. In this case, RRC connection related information (e.g., an RRCSetup message) related to the RRC connection request may be sent on the PDSCH associated with the PUSCH transmission after the PUSCH transmission based on MsgB.

[0130] Hereinafter, physical channels available in a 3GPP-based wireless communication system will be described in detail.

[0131] PDCCH carries DCI. For example, PDCCH (i.e., DCI) carries information about the transmission format and resource allocation of the downlink shared channel (DL-SCH), information about the resource allocation of the uplink shared channel (UL-SCH), paging information about the paging channel (PCH), system information about DL-SCH, resource allocation information of control messages of a layer higher than the physical layer (hereinafter, high layer) in the protocol stack of UE / BS (e.g., random access response (RAR) sent on PDSCH), transmission power control commands, information about the activation / deactivation of configuration scheduling (CS), etc. DCI including resource allocation information about DL-SCH is called PDSCH scheduling DCI, and DCI including resource allocation information about UL-SCH is called PUSCH scheduling DCI. DCI includes a cyclic redundancy check (CRC). The CRC is masked / scrambled with various identifiers (e.g., radio network temporary identifier (RNTI)) according to the owner and purpose of the PDCCH. For example, if the PDCCH is for a specific UE, the CRS is masked with a UE identifier (e.g., cell-RNTI (C-RNTI)). If the PDCCH is for a paging message, the CRC is masked with a paging RNTI (P-RNTI). If the PDCCH is for system information (e.g., system information block (SIB)), the CRC is masked with a system information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with a random access-RNTI (RA-RNTI).

[0132] When the PDCCH on one serving cell schedules the PDSCH or PUSCH on another serving cell, it is called cross-carrier scheduling. Cross-carrier scheduling with a carrier indicator field (CIF) allows the PDCCH on the serving cell to schedule resources on another serving cell. When the PDSCH on the serving cell schedules the PDSCH or PUSCH on the serving cell, it is called self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide information about the cell of the scheduling cell to the UE. For example, the BS may inform the UE whether the serving cell is scheduled by the PDCCH on another (scheduling) cell or by the serving cell. If the serving cell is scheduled by another (scheduling) cell, the BS may inform the UE which cell signals the DL assignment and UL grant of the serving cell. In the present disclosure, the cell carrying the PDCCH is referred to as the scheduling cell, and the cell whose transmission of the PUSCH or PDSCH is scheduled by the DCI included in the PDCCH (i.e., the cell carrying the PUSCH or PDSCH scheduled by the PDCCH) is referred to as the scheduled cell.

[0133] PDSCH is a physical layer UL channel for UL data transmission. PDSCH carries DL data (e.g., DL-SCH transport block) and is subjected to modulation such as quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM, 256QAM, etc. Codewords are generated by encoding transport blocks (TBs). PDSCH can carry up to two codewords. Scrambling and modulation mapping of each codeword can be performed, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to a radio resource together with a DMRS and generated as an OFDM symbol signal. Then, the OFDM symbol signal is sent through the corresponding antenna port.

[0134] For UL-SCH data transmission, the UE needs to have UL resources available for the UE, and for DL-SCH data reception, the UE needs to have DL resources available for the UE. The BS assigns UL and DL resources to the UE through resource allocation. Resource allocation may include time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA). In the present disclosure, UL resource allocation is also referred to as UL grant, and DL resource allocation is also referred to as DL assignment. The UL grant may be dynamically received by the UE on the PDCCH or in the RAR, or the UL grant may be semi-persistently configured to the UE from the BS through RRC signaling. The DL assignment may be dynamically received by the UE on the PDCCH, or semi-persistently configured to the UE from the BS through RRC signaling.

[0135] On the UL, the BS can dynamically allocate UL resources to the UE via a PDCCH addressed to a temporary identifier (cell radio network temporary identifier, C-RNTI). The UE monitors the PDCCH to detect possible UL grants for UL transmission. The BS can use the configuration grant to allocate UL resources to the UE. Two types of configuration grants can be used, type 1 and type 2. In the case of type 1, the BS directly provides the configured UL grant (including periodicity) via RRC signaling. In the case of type 2, the BS configures the periodicity of the RRC-configured UL grant via RRC signaling, and can signal and enable or disable the configured UL grant by addressing the PDCCH to the configuration scheduling RNTI (CS-RNTI). For example, in the case of type 2, the PDCCH addressed to the CS-RNTI indicates that until deactivation, the corresponding UL grant can be implicitly reused according to the periodicity configured via RRC signaling.

[0136] On the DL, the BS may dynamically allocate DL resources to the UE via a PDCCH addressed to the C-RNTI. The UE monitors the PDCCH to detect possible DL assignments. The BS may allocate DL resources to the UE using semi-persistent scheduling (SPS). The BS may configure the periodicity of the configured DL assignments via RRC signaling, and signal and enable or disable the configured DL assignments via a PDCCH addressed to the CS-RNTI. For example, the PDCCH addressed to the CS-RNTI indicates that until deactivation, the corresponding DL assignment may be implicitly reused according to the periodicity configured via RRC signaling.

[0137] Fig. 9 An example of PDSCH TDRA caused by PDCCH and an example of PUSCH TDRA caused by PDCCH are shown.

[0138] The DCI carried by the PDCCH for scheduling PDSCH or PUSCH includes a TDRA field. The TDRA field provides a value m of row index m+1 for the allocation table of PDSCH or PUSCH. The predefined default PDSCH time domain allocation is applied as the allocation table of PDSCH, or the PDSCH TDRA table configured by the BS through the RRC signal pdsch-TimeDomainAllocationList is applied as the allocation table of PDSCH. The predefined default PUSCH time domain allocation is applied as the allocation table of PUSCH, or the PUSCH TDRA table configured by the BS through the RRC signal pusch-TimeDomainAllocationList is applied as the allocation table of PUSCH. The PDSCH TDRA table to be applied and / or the PUSCH TDRA table to be applied can be determined according to fixed / predefined rules (for example, refer to 3GPPTS 38.214).

[0139] In the PDSCH time domain resource configuration, each index row defines the DL assignment with the PDSCH slot offset K0, the start and length indicator SLIV (or the starting position (e.g., starting symbol index S) and allocation length (e.g., number of symbols L) of the PDSCH in the direct slot), and the PDSCH mapping type. In the PUSCH time domain resource configuration, each index row defines the UL grant with the PUSCH slot offset K2, the starting position (e.g., starting symbol index S) and allocation length (e.g., number of symbols L) of the PUSCH in the slot, and the PUSCH mapping type. K0 of PDSCH and K2 of PUSCH indicate the difference between the slot with PDCCH and the slot with PDSCH or PUSCH corresponding to the PDCCH. SLIV represents a joint indicator of the starting symbol S relative to the beginning of the slot with PDSCH or PUSCH and the number of consecutive symbols L counted from symbol S. There are two PDSCH / PUSCH mapping types: one is mapping type A and the other is mapping type B. In the case of PDSCH / PUSCH mapping type A, DMRS is mapped to the PDSCH / PUSCH resource relative to the beginning of the time slot. Depending on other DMRS parameters, one or two symbols of the PDSCH / PUSCH resource may be used as DMRS symbols. For example, in the case of PDSCH / PUSCH mapping type A, according to RRC signaling, the DMRS is located in the third symbol (symbol #2) or the fourth symbol (symbol #3) in the time slot. In the case of PDSCH / PUSCH mapping type B, DMRS is mapped relative to the first OFDM symbol of the PDSCH / PUSCH resource. Depending on other DMRS parameters, one or two symbols from the first symbol of the PDSCH / PUSCH resource may be used as DMRS symbols. For example, in the case of PDSCH / PUSCH mapping type B, DMRS is located at the first symbol allocated for PDSCH / PUSCH. In the present disclosure, the PDSCH / PUSCH mapping type may be referred to as a mapping type or a DMRS mapping type. For example, in the present specification, PUSCH mapping type A may be referred to as mapping type A or DMRS mapping type A, and PUSCH mapping type B may be referred to as mapping type B or DMRS mapping type B.

[0140] The scheduling DCI includes an FDRA field that provides assignment information about RBs for PDSCH or PUSCH. For example, the FDRA field provides information about a cell used for PDSCH or PUSCH transmission to a UE, information about a BWP used for PDSCH or PUSCH transmission, and / or information about RBs used for PDSCH or PUSCH transmission.

[0141] A CORESET may be defined and / or configured as a set of time-frequency resources in which a UE can monitor a PDCCH. A CORESET has a duration of one to three OFDM symbols and includes a set of PRBs. The PRBs included in the CORESET and the CORESET duration may be provided to the UE via high-level (e.g., RRC) signaling. The UE may monitor the PDCCH candidate set in the configured CORESET according to the corresponding search space set. In the present disclosure, monitoring means decoding (blind decoding) of each PDCCH candidate based on the monitored DCI format. The MIB on the PBCH provides the UE with parameters (e.g., CORESET#0 configuration) for monitoring the PDCCH that schedules the PDSCH carrying SIB1. The PBCH may indicate that there is no associated SIB1. In this case, the UE may be provided not only with a frequency range in which the UE is allowed to assume that there is no SSB associated with SSB1, but also with another frequency range in which the UE is allowed to discover the SSB associated with SIB1. As a CORESET for scheduling at least SIB1, CORESET#0 may be configured via MIB or dedicated RRC signaling.

[0142] One or more CORESETs may be configured for a UE, and multiple CORESETs may overlap in the time / frequency domain. To configure a CORESET, the following parameters may be provided by the BS.

[0143] -controlResourceSetId: indicates information about the identification (ID) of CORESET.

[0144] -frequencyDomainResources: represents the frequency domain resources of the CORESET and is indicated by a bitmap, where each bit corresponds to an RB group (= 6 consecutive RBs). For example, the MSB (most significant bit) of the bitmap corresponds to the first RB group within the BWP. The RB group corresponding to the bit with a value of 1 is allocated as the frequency domain resource of the CORESET.

[0145] -duration: represents the time domain resource of CORESET, specifically, indicates the number of consecutive OFDMA symbols included in CORESET. For example, duration may have a value in the range of 1 to 3.

[0146] -cce-REG-MappingType: indicates the CCE to REG mapping type. Both interleaved and non-interleaved types are supported.

[0147] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0148] -tci-StatesPDCCH: Information about the Transmission Configuration Indication (TCI) state of PDCCH (e.g., TCI-StateID)

[0149] -tci-PresentInDCI: indicates whether the TCI field is included in the DCI.

[0150] -pdcch-DMRS-ScramblingID: indicates information used for initialization of the PDCCH DMRS scrambling sequence.

[0151] The TCI state includes a quasi-colocation (QCL) relationship between one or more DL RSs and the DM-RS port of the PDSCH, the DM-RS port of the PDCCH, or the CSI-RS port of the CSI-RS resource. The TCI state index corresponding to each code point in the "Transmission Configuration Indication" field among the fields in the DCI that schedules the PDSCH is enabled by the MAC control element (CE). The TCI state configuration of each TCI state index is performed through RRC signaling.

[0152] The PDCCH candidate set monitored by the UE is defined according to the PDCCH search space set. The search space set can be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration.

[0153] The UE monitors a set of PDCCH candidates in one or more CORESETs on an active DLBWP on each enabled serving cell configured with PDCCH monitoring according to a corresponding search space set, where monitoring means receiving each PDCCH candidate and decoding according to the monitored DCI format.

[0154] The following table shows the PDCCH search space.

[0155] [Table 4]

[0156]

[0157] The SS set may be configured via system information (e.g., MIB) or UE-specific high-layer (e.g., RRC) signaling. S (e.g., 10) SS sets or fewer SS sets may be configured in each DL BWP of a serving cell. For example, the following parameters / information may be provided for each SS set. Each SS set may be associated with one CORESET, and each CORESET configuration may be associated with one or more SS sets.

[0158] -searchSpaceId: indicates the ID of the SS set.

[0159] -controlResourceSetId: Indicates the CORESET associated with the SS set.

[0160] - monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring periodicity (in time slots) and the PDCCH monitoring offset (in time slots).

[0161] -monitoringSymbolsWithinSlot: Indicates the first OFDMA symbol for PDCCH monitoring in the slot where PDCCH monitoring is configured. The first OFDMA symbol is indicated by a bitmap, and each bit corresponds to a corresponding one of the OFDMA symbols in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDMA symbol corresponding to the bit with a value of 1 corresponds to the first symbol in the CORESET in the slot.

[0162] -nrofCandidates: indicates the number (eg, one of 0, 1, 2, 3, 4, 5, 6, and 8) of PDCCH candidates for each AL (where AL={1, 2, 4, 8, 16}).

[0163] -searchSpaceType: Indicates whether the SS type is CSS or USS.

[0164] -DCI format: indicates the DCI format of the PDCCH candidate.

[0165] The UE may monitor PDCCH candidates in one or more SS sets in a time slot according to the configuration of the CORESET / SS set. The timing (e.g., time / frequency resource) of monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities may be configured in a time slot.

[0166] Fig.10 The SSB and CORESET multiplexing patterns are shown. Specifically, Fig.10 (a) shows SSB and CORESET multiplexing pattern 1, Fig.10 (b) shows SSB and CORESET multiplexing pattern 2, Fig.10 (c) shows SSB and CORESET multiplexing pattern 3. The SSB and CORESET multiplexing patterns may be defined according to a frequency range (FR) to which a corresponding cell belongs or a subcarrier spacing of an SSB or a PDCCH.

[0167] like Fig.10 As shown, SSB and CORESET can be multiplexed in the time domain, in the time domain and frequency domain, or in the frequency domain.

[0168] The PDCCH candidate set monitored by the UE is defined according to the PDCCH search space set. The search space set can be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration.

[0169] The UE monitors a set of PDCCH candidates in one or more CORESETs on an active DLBWP on each enabled serving cell configured with PDCCH monitoring according to a corresponding search space set, where monitoring means receiving each PDCCH candidate and decoding according to the monitored DCI format.

[0170] Fig.11 1 shows a discontinuous reception (DRX) operation. Specifically, Fig.11 The DRX cycle of a UE in RRC_CONNECTED state is shown.

[0171] The UE may perform DRX operation while executing the processing and / or method according to the implementation mode of the present disclosure. The DRX configuration / operation is defined in the NR specification (e.g., Rel-17). DRX for reducing unnecessary power consumption of the UE has the following features. In DRX, the structure of the UE in the RRC_IDLE state (hereinafter referred to as I-DRX) and the structure of the UE in the RRC_CONNECTED state (hereinafter referred to as C-DRX) are separately defined. The two DRX structures are designed so that the period (e.g., the active time period or the on-duration period) in which the UE expects to receive the DL signal occurs periodically, thereby reducing the unnecessary power consumption of the UE in other periods. In particular, in the case of C-DRX, the starting position of the on-duration period is periodically defined according to the NR Rel-16 specification. In this case, the size of the configured period (i.e., DRX cycle) can be determined / configured by high-layer signaling such as RRC signaling provided by the BS to the UE.

[0172] Reference Fig.11, the DRX cycle includes an on-duration and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the on-duration, followed by a possible period of inactivity. The on-duration is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on-duration. When the UE successfully detects the PDCCH during the PDCCH monitoring period, the UE starts the inactivity timer and remains awake. On the contrary, when the UE fails to detect any PDCCH during the PDCCH monitoring period, the UE transitions to a sleep state after the on-duration. Therefore, when DRX is configured, the UE may perform PDCCH monitoring / reception discontinuously in the time domain in the process and / or method according to the implementation of the present disclosure. For example, when DRX is configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH search space) may be configured discontinuously according to the DRX configuration in the present disclosure. On the contrary, when DRX is not configured, the UE may perform PDCCH monitoring / reception continuously in the time domain. For example, when DRX is not configured, the PDCCH reception opportunities (e.g., time slots with PDCCH search spaces) may be continuously configured in the present disclosure. Regardless of whether DRX is configured, PDCCH monitoring may be limited during time periods configured as measurement gaps. DRX configuration information is received through high-layer (e.g., RRC) signaling, and DRX on / off is controlled by a DRX command from the MAC layer. Once DRX is configured, the UE may perform PDCCH monitoring discontinuously, such as Figure 8 shown.

[0173] The following table describes the DRX operation of the UE. Referring to the following table, DRX configuration information is received through high-layer signaling (e.g., RRC signaling), and DRX on / off is controlled by a DRX command from the MAC layer. Once DRX is configured, the UE may perform PDCCH monitoring discontinuously, such as Fig.11 shown.

[0174] [Table 5]

[0175]

[0176] MAC-CellGroupConfig includes configuration information required to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, when defining DRX, MAC-CellGroupConfig may include the following information.

[0177] -drx-OnDurationTimer value: Configure the duration when the DRX cycle starts.

[0178] -drx-SlotOffset value: configures the delay before starting drx-onDurationTimer.

[0179] - Value of drx-InactivityTimer: Duration after the PDCCH opportunity when the PDCCH indicates a new UL or DL ​​transmission by the MAC entity.

[0180] - Value of drxRetransmissionTimerDL (per DL HARQ process except broadcast process): configures the maximum duration until a DL retransmission is received.

[0181] - Value of drxRetransmissionTimerUL (per UL HARQ process): configures the maximum duration until a grant for UL retransmission is received.

[0182] - Value of drx-HARQ-RTT-TimerDL (per DL HARQ process except broadcast process): configures the maximum duration from reception of initial DL transmission to reception of DL assignment for HARQ retransmission.

[0183] - Value of drx-HARQ-RTT-TimerUL (per UL HARQ process): configures the maximum duration from receiving a grant for an initial UL transmission to receiving a grant for a UL retransmission.

[0184] -drx-LongCycleStartOffset: configures the long DRX cycle and drx-StartOffset, which defines the subframes where the long and short DRX cycles start.

[0185] -drx-ShortCycle (optional): Configure a short DRX cycle.

[0186] -drx-ShortCycleTimer (optional): configures the duration of the short DRX cycle that the UE should follow. For example, the value of the multiple of the short DRX cycle can be configured by drx-CycleTimer. For example, the value of n can correspond to n*drx-ShortCycle.

[0187] If the DRX group is within the active time, the UE may perform PDCCH monitoring on the serving cells within the DRX group. In this case, the DRX group refers to a group of serving cells configured by RRC and having the same DRX active time. Here, the active time refers to the total duration for which the UE monitors the PDCCH. The active time may include the on-duration of the DRX cycle, the time for which the UE performs continuous reception while the inactivity timer has not expired, and the time for which the UE performs continuous reception while waiting for a retransmission opportunity. For example, when DRX is configured, the active time of the service cells in the DRX group includes i) the time when the drx-onDurationTimer or drx-InactivityTimer configured for the DRX group is running; or ii) the drx-RetransmissionTimerDL or drx-RetransmissionTimerUL is running on any service cell in the DRX group; or the ra-ContentionResoultionTimer or msgB-RsponseWindow is running; or the time when no PDCCH indicating a new transmission of the C-RNTI sent to the MAC entity of the UE is received after successfully receiving a random access response to a random access preamble that was not selected by the MAC entity among the contention-based random access preambles.

[0188] One or more DRX groups can be configured to the UE through RRC signaling from the BS. For example, if two DRX groups are configured, each serving cell is uniquely assigned to one of the two DRX groups. The DRX parameters: drx-onDurationTimer and drx-InactivityTimer are configured separately for each DRX group. The DRX parameters: drx-SlotOffset, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, drx-LongCycleStartOffset, drx-ShortCycle (optional), drx-ShortCycleTimer (optional), drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerUL are common to the DRX groups. Since each serving cell belongs to only one DRX group, and DRX parameters drx-onDurationTimer and drx-InactivityTimer are configured for each DRX group, and other DRX parameters are common to the DRX group, it can be considered that the serving cell is associated with only one DRX parameter set.

[0189] Fig.12 The configuration of the long DRX cycle and the short DRX cycle is shown. Specifically, Fig.12The case where drx-ShortCycleTimer is set to 2 is shown.

[0190] The BS may configure a long DRX cycle and an additional short DRX cycle that is shorter than the long DRX cycle. If the short DRX cycle is not configured, the UE may follow the long DRX cycle. When the short DRX cycle is configured, the BS may set the duration of the long DRX cycle to a positive integer multiple of the short DRX cycle. If there is no data activity during the on-duration of the long DRX cycle, the UE may follow the long DRX cycle as if the short DRX cycle was not configured. If there is data activity during the on-duration of the long DRX cycle, for example, while drx-onDurationTimer is running, the UE switches to the short DRX cycle and follows the short DRX cycle for a specific time period (for example, while drx-ShortCycleTimer is running). Reference Fig.12 If there is no data activity during the time when the UE follows the short DRX cycle, for example, if there is no data activity during the period defined by drx-ShortCycleTimer*drx-ShortCycle, the UE switches from a short DRX cycle to a long DRX cycle, each having a duration of drx-ShortCycleTimer.

[0191] The UE does not need to monitor PDCCH across the entire frequency of the cell, in this case, the UE monitors PDCCH only on one active BWP of the cell. Independent of the DRX inactivity timer, a BWP inactivity timer can be configured for the cell and used to switch the active BWP to the default BWP. The BWP inactivity timer is restarted on successful PDCCH decoding, and switching to the default BWP occurs when the BWP inactivity timer expires.

[0192] According to the current 5G specifications, Fig.13In the DL-SCH, SIB1 is sent with a periodicity of 160ms or a variable transmission repetition periodicity within 160ms as part of the minimum system information required for cell access. The default transmission repetition periodicity of SIB1 is 20ms, but the actual transmission repetition periodicity depends on the network implementation. For SSB and CORESET multiplexing pattern 1, the transmission repetition period of SIB1 is 20ms. For SSB and CORESET multiplexing patterns 2 / 3, the transmission repetition period of SIB1 is the same as the SSB period. The PDCCH monitoring timing at which the UE attempts to decode the SIB1 PDCCH can be determined based on information in the MIB (e.g., pdcch-ConfigSIB1). For example, during cell search, if the UE determines that there is a Type0-PDCCH CSS set based on the MIB, the UE can determine the number of consecutive RBs and the number of consecutive symbols of the CORESET of the Type0-PDCCH CSS set from controlResourceSetZero in pdcch-ConfigSIB1. The UE may also determine the PDCCH monitoring opportunity from searchSpaceZero in pdcch-ConfigSIB1. For example, for an SSB with index i, searchSpaceZero may provide the system frame number (SFN) of the frame of the relevant CORESET. C ; and SFN C The corresponding frame includes the first time slot of the Type-0 monitoring opportunity, time slot n0; and the parameter value combination required to determine the index of the first symbol of the corresponding CORESET in time slot n0. The UE can monitor the Type0-PDCCH CSS set in the PDCCH monitoring opportunity to detect the SIB1 PDCCH. The UE can determine the frequency resource allocation and time resource allocation of the SIB1 PDSCH from the DCI carried by the SIB1 PDCCH. The UE can receive / decode SIB1 based on the frequency resource allocation and the time resource allocation.

[0193] When the UE has no ongoing data transmission / reception, the UE enters RRC_IDLE or RRC_INACTIVE to save power. When DL data for the UE arrives at the network, the network sends a paging message on a paging occasion (PO) to trigger the RRC setup process and the RRC connection recovery process. PO refers to a set of PDCCH monitoring opportunities and may consist of multiple time slots (e.g., subframes or OFDM symbols). DCI with a CRC scrambled with P-RNTI may be sent on the PO. In multi-beam operation, the UE assumes that the same paging message is repeated in all transmitted beams. The paging message is the same for both paging initiated by the radio access network (RAN) and paging initiated by the core network (CN). A paging frame (PF) is a radio frame and may contain one or more POs or the starting point of a PO. The UE monitors one paging occasion (PO) per DRX cycle. The PF and PO used for paging can be determined by a predetermined equation. For example, in some implementations, the system frame number (SFN) of the PF may be determined by (SFN+PF_offset) mod T = (Tdiv N) * (UE_ID mod N), and the index i_s indicating the index of the PO may be determined by i_s = floor(UE_ID) mod Ns, where T is the DRX cycle of the UE and is determined by the shortest of the UE-specific DRX value and / or the default DRX value broadcast in the system information, N is the total number of paging frames in T, Ns is the number of paging occasions used for the PF, PF_offset is an offset for PF determination, and UE_ID is a value determined based on the 5G-S-TMSI. The following parameters may be signaled in SIB1: a parameter related to the number of POs per paging frame, Ns; ​​a parameter for deriving the total number of paging frames in T, nAndPagingFrameOffset; a parameter related to the number of PDCCH monitoring occasions corresponding to SSBs in the PO, nrofPDCCH-MonitoringOccasionsPerSSB-InPO; and the length of the default DRX cycle. The values ​​of N and PF_offset are derived from the parameter nAndPagingFrameOffset. The PDCCH monitoring occasion for paging is determined based on the following parameters: a parameter indicating the first PDCCH monitoring occasion for paging for each PO of the PF, firstPDCCH-MonitoringOccasionOfPO; and a parameter nrofPDCCH-MonitoringOccasionsPerSSB-InPO. For paging in the initial DL BWP, the parameter firstPDCCH-MonitoringOccasionOfPO may be signaled in SIB1.For paging in a DLBWP other than the initial DL BWP, the parameter firstPDCCH-MonitoringOccasionOfPO may be signaled in the corresponding BWP configuration. Paging DRX is defined which requires a UE in RRC_IDLE or RRC_INACTIVE state to monitor the paging channel during one PO per DRX cycle. The network may configure the following paging DRX cycles: i) for CN initiated paging, a default cycle is broadcast in the system information, ii) for CN initiated paging, a UE specific cycle may be configured via non-access stratum (NAS) signaling, iii) for RAN initiated paging, a UE specific cycle may be configured via RRC signaling. The UE uses the shortest cycle among the applicable DRX cycles. For example, a UE in RRC_IDLE may use the shortest of the first two DRX cycles mentioned above, and a UE in RRC_INACTIVE may use the shortest of the three DRX cycles.

[0194] Energy saving of BS is significantly considered in wireless communication systems including 3GPP due to its potential contribution to building environmentally friendly networks by reducing carbon emissions and cutting the operating expenditure (OPEX) of communication operators. In particular, as the demand for high transmission rates continues to escalate with the emergence of 5G communications, BSs need to be equipped with a larger number of antennas and provide services in wider bandwidths and frequency bands. According to recent studies, the energy cost of BSs has reached as high as 20% of the total OPEX. Due to the increased attention to BS energy saving, 3GPP NR Release 18 approved a new research project called "Network Energy Saving Research". For example, in order to enhance the energy-saving capabilities in terms of transmission and reception of BS, this study investigates how to use potential support / feedback from UE and potential UE support information based on one or more network energy-saving technologies with finer adaptive granularity to dynamically and / or semi-statically achieve more efficient transmission and / or reception operations in time, frequency, space and power domains.

[0195] In some implementations of the present disclosure, the BS may switch to a network energy saving (NES) mode (e.g., sleep mode) by turning off some hardware components of the BS under light load conditions or when there is no data to send / receive. However, if the BS needs to send a signal / channel periodically, if DL data needs to be sent suddenly, or if an SR is received from the UE, the BS needs to turn on the hardware components again and switch to a non-NES mode (e.g., non-sleep mode or active mode) to perform sending / receiving. Therefore, in some implementations of the present disclosure, the BS may configure or define multiple sleep modes, and predefine which hardware components of the BS may be turned off for each sleep mode. When there is frequent data to send / receive, the BS operates between a shallow sleep mode and an active mode to turn off only hardware components that can be turned on and off quickly. As the time without sending / receiving increases, the BS enters a deep sleep mode to turn off more hardware components, thereby saving more energy. However, although the deep sleep mode can save more energy by turning off more hardware, compared to the shallow sleep mode, when data to be sent / received appears, a longer delay and higher transition energy may be required to switch back to the active mode. In some implementations of the present disclosure, when the BS operates in multiple sleep modes, the BS may associate frequency domain resources with each sleep mode. Based on the transition between sleep modes, the BS may adjust the frequency domain resources to achieve energy saving. The energy saving method of associating the above resources with each sleep mode can be applied not only to the frequency domain, but also to the time domain, space domain and / or power domain individually or in combination to further enhance the energy saving effect.

[0196] Hereinafter, implementations of the present disclosure utilizing multiple sleep modes will be described.For convenience of explanation, the sleep time or sleep duration during which the BS and / or UE operates in the sleep mode will be referred to as inactive time / duration, inactive time / duration, or off time / duration.

[0197] Hereinafter, operation of a BS in an NES mode for energy saving (ES) may mean that the BS preconfigures a plurality of off periods (i.e., discontinuous transmission (DTX) periods) during a specific time period to turn off transmission of a specific DL signal, and then dynamically indicates one of the off periods to notify that the corresponding DL signal will not be sent during the predefined time period, so as to achieve power consumption reduction for both the BS and the UE. The NES mode may be applied not only to the time domain, but also to the following operations in the frequency domain: BWP switching, dynamic RB adaptation, etc. For the spatial domain, the NES mode may refer to an operation mode in which the BS avoids performing transmission and / or reception on a corresponding antenna port to achieve power consumption reduction for both the BS and the UE when the BS semi-statically or dynamically disables a specific reception antenna port.

[0198] In the following description, the term "DRX" is used mainly for convenience, but DRX from the perspective of the UE may correspond to DTX from the perspective of the network, and DRX from the perspective of the network may correspond to DTX from the perspective of the UE. Therefore, in some of the above-mentioned implementations, DRX may be a concept including DTX, and DTX may be a concept including DRX. In particular, although the expression "DRX of the BS" is mainly used to describe the NES mode operation of the BS, the transmission / reception turned off during the shutdown duration in the NES mode of the BS may include not only DL signals / channels, but also UL signals / channels. Therefore, in the implementation of the present disclosure described later, the DRX operation may involve turning off both the transmission and reception operations as well as turning off the reception or transmission operations.

[0199] <Method #1> A method of configuring association between each sleep mode and resources in the frequency domain / time domain / space domain / power domain (e.g., bandwidth of BWP) and adjusting the associated resources according to the sleep mode transition of the BS when the BS operates in multiple sleep modes for energy saving

[0200] >(1-1) A method for pre-configuring associations between resources for each sleep mode of a BS and using resources associated with each sleep mode in each domain according to a sleep mode transition indication / configuration of the BS

[0201] >>i. In the case of frequency domain resources, the deeper the sleep mode, the BWP switches to a smaller bandwidth, the bandwidth of the BWP decreases, or is associated with a smaller set (group) of RBs within the BWP.

[0202] >>ii. In the case of time domain resources, the deeper the sleep mode, the longer the BS's off duration is configured, or the more UE groups' on durations are aligned (or switched to a specific DRX (C-DRX or I-DRX) group). Alternatively, reduce the transmission of common signals / channels, or extend their transmission periodicity.

[0203] >>iii. In case of spatial domain resources, the deeper the sleep mode, the more transmission and reception (TRX) is turned off (antenna port, panel or transmit and receive point (TRP) on / off). Alternatively, CSI-RS resources and reporting are turned off, or a reduced TCI state list is applied.

[0204] >(1-2) Method for operating a timer when a UE independently adjusts resources associated with a sleep mode without a separate instruction from a BS

[0205] >>i. Method of operating an existing inactivity timer (eg, BWP inactivity timer, C-DRX inactivity timer, or I-DRX related timer) together with an NES timer for sleep mode transition

[0206] >>>If either of the two timers expires, a transition to sleep mode occurs.

[0207] >>>Priority is given to one of the two timers, and when the corresponding timer expires, a transition to sleep mode occurs.

[0208] >>>The transition to sleep mode occurs only when both timers expire.

[0209] >>ii. Pre-configure multiple maximum values ​​for the NES timer and then indicate one of the maximum values ​​through the DCI / MAC CE

[0210] >>> If there is no activity until the timer reaches the maximum value (or starts from the maximum value and reaches 0), the UE

[0211] >>>From the time the NES sleep mode timer reaches the (indicated) maximum value (or from the time the timer starts from the maximum value and reaches 0), the UE stops running the existing BWP inactivity timer and keeps the timer in the reset state.

[0212] >>iii. Method for distinguishing the determination of "inactivity" when operating the existing BWP inactivity timer from the determination of "inactivity" when operating the NES sleep mode timer

[0213] >>>NES sleep mode timer is related to inactivity in the network (NW) rather than inactivity of the UE. Therefore, the UE restarts the timer when any DCI indication / signaling is received that does not include a DL / UL grant or when any DCI indication / signaling is detected that includes a DL / UL grant and / or any DL signal / channel (e.g., SSB / CSI-RS / SPS PDSCH).

[0214] >>>When indicated to operate the NES sleep mode timer (with maximum value), the UE operates to release all configuration grants (CGs) and / or semi-persistent scheduling (SPS) that were pre-configured / indicated.

[0215] The methods in (1-1) and (1-2) may be applied alone or in combination. Hereinafter, the methods described in (1-1) and (1-2) will be described in more detail.

[0216] Fig.13 and Fig.14 The energy saving method according to some implementations of the present disclosure is shown. Fig.13 and Fig.14In the above description, "F" represents frequency, "T" represents time, "S" represents space, and "P" represents power. F / T / S / P domain resources #i refer to a collection of frequency domain resources, time domain resources, space domain resources, and / or power domain resources. In the present disclosure, frequency domain / time domain / space domain / power domain resources #i are also referred to as frequency domain / time domain / space domain / power domain NES technology #i.

[0217] Regarding UE power saving mode, three sleep modes (e.g., micro sleep, light sleep, and deep sleep) are defined and studied according to the energy saving level. Energy saving is achieved by transitioning between sleep modes based on the duration of the idle state without data activity. Similarly, referring to Fig.13 BS can have multiple sleep modes with different energy saving levels (such as Fig.13 As shown in FIG. 1 , the BS can switch from active mode to each sleep mode based on the idle duration (sleep mode #1, sleep mode #2, sleep mode #3, ...) to achieve energy saving. The deeper the level of the sleep mode, the longer the period of time the BS needs to remain inactive to switch to the sleep mode. The BS can save more energy by shutting down more hardware components. In addition, Fig.13 As shown, the BS can achieve energy saving by associating the time domain / frequency domain / space domain / power domain resources used in the transmission between the BS and the UE with each sleep mode. That is, the deeper the sleep mode, the less resources are used for transmission, thereby achieving energy saving.

[0218] Therefore, when the BS operates in multiple sleep modes for energy saving, the BS may configure the association between each sleep mode level and resources in the frequency domain / time domain / spatial domain / power domain (e.g., the bandwidth of the BWP), and adjust the associated resources according to the sleep mode transition of the BS. In some implementations, when transitioning from an active mode to each sleep mode, the BS may indicate or configure the transition to the sleep mode to the UE in the cell via a group-common DCI (or a group-common MAC CE). In addition, the indication / configuration may include information about the specific sleep mode to which the BS intends to transition. Based on the indication, the UE may use the frequency domain / time domain / spatial domain / power domain resources pre-associated with the specific sleep mode to send / receive. Even if the BS does not indicate the resources for sending / receiving separately for each domain, the UE may adjust the amount of resources, so that both the BS and the UE can achieve energy saving effects.

[0219] For example, in the case of frequency domain resources, the deeper the sleep mode, the smaller the bandwidth of the BWP can be switched to, the bandwidth of the BWP can be reduced, or it can be associated with a smaller RB set (group) within the BWP. When the sleep mode is associated with the RB set (group), it means that among the RBs included in the BWP, the RB set or RB set group is predefined or configured, and according to the sleep mode, only a specific RB set or RB set group can be used to perform transmission / reception instead of using all RBs of the BWP. In addition, in the case of BWP switching, for example, the BS can configure multiple BWPs with different bandwidth sizes for each sleep mode of the BS, and switch the BWP according to the sleep mode transition of the BS. Therefore, as the BS switches to the sleep mode, the UE can save energy by using fewer frequency resources (e.g., RBs) for transmission / reception.

[0220] In the case of time domain resources, as the sleep mode becomes deeper, the BS may configure a longer off duration of the BS, align the on durations of more UE groups (or switch to a specific DRX (C-DRX or I-DRX) group), reduce the transmission of common signals / channels, or extend their transmission periodicity. For example, the BS may pre-configure multiple time domain symbol on / off patterns and apply specific time domain on / off patterns based on the sleep mode transition configuration / indication of the BS. In this case, as the sleep mode becomes deeper, the BS may use the symbol OFF to configure a longer DTX cycle (e.g., by configuring a time period in which transmission or reception (or both) is not performed at the symbol level). In addition, for UEs configured with C-DRX in a cell, the start point and duration of the on duration may be different for each UE. In order to check whether the UE has transmission / reception during the on duration (e.g., sending DL assignments or UL grants to each UE configured with C-DRX or receiving CSI reports), the BS needs to wake up periodically and transition to active mode. As a result, from the perspective of the BS, due to the on durations of multiple UEs, transitions between sleep and active modes are required, so the sleep time may be significantly short. Alternatively, a UE configured with I-DRX performs PDCCH monitoring during a paging occasion (PO) to check whether there is any paging directed to the UE in each DRX cycle. From the perspective of the BS, since paging needs to be sent during the PO of multiple UEs rather than a single UE, if the PO is distributed, the available sleep time may be significantly short. Therefore, based on the sleep mode configuration / indication of the BS, the on-duration (or PO) of the UE configured with C-DRX (or I-DRX) needs to be aligned to allow the BS to maximize its sleep time while multiple UEs are in the off-duration, thereby saving energy. Alternatively, from the perspective of the UE, the UE may receive multiple candidate on-duration positions from the BS. The UE may be associated with a specific on-duration position among the candidates of each sleep mode to adjust the on-duration position based on the sleep mode of the BS. Alternatively, the BS may configure multiple DRX (C-DRX or I-DRX) groups for NES, and according to the sleep mode indication / configuration of the BS, the UE may apply the DRX parameters of a specific DRX group among the DRX groups configured to the UE. In this case, each DRX group may be associated with the sleep mode of the BS. In addition, the BS may associate the transmission periodicity or number of transmissions of a normally open common signal / channel such as SSB / SIB1 with the sleep mode of the BS. As the BS transitions to a deeper sleep mode, the BS may reduce the number of transmissions or extend the transmission periodicity, thereby maximizing the sleep time of the BS and achieving energy saving. The UE may also save energy by maintaining a sleep mode during the symbol off duration based on the BS's indication without performing transmission / reception. If the transmission of a common signal / channel such as SSB / SIB1 is reduced or the transmission periodicity is extended, the UE may maintain the sleep mode for a longer period accordingly.

[0221] In the case of spatial domain resources, as the sleep mode becomes deeper, the BS may turn off more TRXs (antenna ports, patterns, or TRPs on / off), turn off CSI-RS resource reporting, or apply a reduced TCI state list as the sleep mode becomes deeper. For example, if the BS performs transmission / reception through 64 TX / RX radio units (RUs) in active mode, the BS may use only 32 TX / RX RUs in sleep mode 1. In sleep mode 2, the BS may use only 16 TX / RX RUs for transmission / reception, thereby saving energy. Alternatively, in active mode, all 4 TRPs may be used. However, in sleep mode 1, only 2 TRPs are turned on, and in sleep mode 2, only 1 TRP is turned on, while the remaining TRPs are turned off, thereby saving energy. In addition, among the CSI-RS resources pre-configured for the UE, a specific resource may be inactive for each sleep mode. The BS does not send CSI-RS on the specific resource, and the UE does not expect to receive CSI-RS or send any reports, thereby saving energy.

[0222] In addition, the UE can independently adjust the resources associated with the sleep mode based on the timer without a separate indication from the BS, in which case the NES timer for sleep mode transition can be configured / used. When the UE is configured with C-DRX, the inactivity timer is semi-statically configured, and the NES timer for the sleep mode transition of the BS can be additionally configured. In this case, if either of the two timers (i.e., the DRX inactivity timer or the NES timer) expires, the UE can transition to sleep mode. Alternatively, the UE can give priority to a specific one of the two timers and transition to sleep mode when the specific timer expires, or the UE can transition to sleep mode only when the two timers expire. In addition, the existing BWP or C-DRX inactivity timer is semi-statically configured by high-level signaling (e.g., RRC signaling). In some implementations of the present disclosure, the NES timer can be operated more dynamically. For example, the BS can pre-configure multiple maximum values ​​for the NES timer and indicate one of the maximum values ​​by (group common) DCI / MAC CE. The UE can operate the timer. If there is no activity until the timer reaches the maximum value (or starts from the maximum value and reaches 0), the UE may assume the NES sleep mode and operate accordingly. In other words, even without a specific indication from the BS, if there is no data activity until the timer reaches the maximum value (or starts from the maximum value and reaches 0), the UE may assume that the BS will transition to NES mode. The UE may also transition to sleep mode to save energy. In addition, when the NES sleep mode timer reaches the (indicated) maximum value (or starts from the maximum value and reaches 0), the UE may stop the (running) inactivity timer and keep the timer in a reset state to ensure that the existing inactivity timer does not continue.

[0223] Next, it may be necessary to distinguish between the determination of "inactivity" when operating an existing inactivity timer and the determination of "inactivity" when operating the NES sleep mode timer. For example, according to the current 3GPP 38.321MAC standard, the BWP inactivity timer is started or restarted when a DL / UL grant PDCCH is received or when data transmission / reception occurs through a CG / SPS. However, the timer continues to run without being affected by other DCI indications or signaling (i.e., no restart is required). Since the NES sleep mode timer is related to inactivity in the BS rather than inactivity in the UE, the UE may restart the timer when any DCI indication / signaling that does not include a DL / UL grant is received or when any DCI indication / signaling that includes a DL / UL grant and / or any DL signal / channel (e.g., SSB / CSI-RS / SPSPDSCH) is detected. In addition, when the UE is instructed to operate the NES sleep mode timer (with a maximum value), the UE may operate to release all pre-configured / indicated CG / SPS.

[0224] In some implementations, when the UE is configured with DRX (C-DRX or I-DRX), the frequency domain / time domain / space domain / power domain NES technology may be applied differently according to the active time period and the inactive time period within the DRX cycle. For example, the frequency domain / time domain / space domain / power domain NES technology may be applied during the active time of the DRX cycle, but not outside the active time period. For example, assuming that the BS performs transmission / reception with 64 antenna ports and 100MHz bandwidth during the active time when the NES technology is not applied, if the NES technology is applied, PDCCH / PDSCH transmission / reception can be performed by reducing the number of antenna ports used during the active time to 32 and reducing the bandwidth to 50MHz, which can lead to energy saving. Outside the UE C-DRX active time period, the UE does not receive PDCCH / PDSCH, and only performs SR or CSI-RS reception. Therefore, the energy saving benefits that can be obtained by the NES technology may not be significant. As a result, the time domain / frequency domain / space domain / power domain NES technology proposed above may not be applied outside the active time period of the DRX cycle. For example, when the UE is configured with C-DRX, an onDuration timer is provided to the UE, and during each onDuration in the DRX cycle, the UE performs monitoring for PDCCH reception in each time slot. If the UE receives a PDCCH during the onDuration, the UE may wait for a transmission / reception schedule from the BS until the inactivity timer starts and expires. In addition, when the retransmission timer is running, the UE maintains an active state for retransmission. Here, the active time within the DRX cycle refers to the union of the periods during which the UE performs PDCCH monitoring in each time slot while operating according to the DRX configuration provided by the BS. Alternatively, in some implementations, the active time may be limited to the period during which the onDuration timer is running, or the active time may be limited to the period corresponding to the union of the time period during which the onDuration timer is running and the time period during which the inactivity timer is running. In addition, when the timer (for defining / determining the active time) expires, or when the UE receives a DRX command during the active time, the UE enters the inactive time, during which the UE does not receive the PDCCH until the next onDuration in the subsequent DRX cycle.

[0225] In addition, in some implementations, when the BS provides multiple DRX configurations to the UE and switches to one of the multiple DRX configurations via a specific (group common) DCI indication, the BS may configure / indicate, for example, that frequency domain / time domain / space domain / power domain NES techniques are applied to DRX configuration #1, while these techniques are not applied to DRX configuration #2. Alternatively, the BS may configure / indicate that frequency domain / time domain / space domain / power domain NES technique #1 is applied to DRX configuration #1, while frequency domain / time domain / space domain / power domain NES technique #2 is applied to DRX configuration #2. For example, referring to Fig.14 , the BS may configure or associate frequency domain / time domain / space domain / power domain resource #1 with DRX configuration #1, configure or associate frequency domain / time domain / space domain / power domain resource #2 with DRX configuration #2, and configure or associate frequency domain / time domain / space domain / power domain resource #2 with DRX configuration #3. These configurations and / or associations may be provided to the UE.

[0226] In some implementations, a method of replacing the DRX configuration with a BWP may be considered. For example, when the BWP of the UE is switched to a specific BWP, the frequency domain / time domain / space domain / power domain NES technology may be applied only to the BWP. Alternatively, the frequency domain / time domain / space domain / power domain NES technology #1 may be applied in BWP #1, and the frequency domain / time domain / space domain / power domain NES technology #2 may be applied in BWP #2. It is worth noting that when the BS provides multiple DRX configurations and indicates switching to a specific DRX configuration, the BS and the UE may change the DRX configuration while jointly performing the BWP switching. Depending on the DRX configuration and the switched BWP, the frequency domain / time domain / space domain / power domain NES technology may be applied differently. On the other hand, if the BWP switching is performed after the BWP switching is pre-linked with the DRX configuration, the BS and the UE may also switch to the DRX configuration linked to the corresponding BWP (wherein the DRX configuration may be used for NES mode operation or non-NES operation). For example, BWP #1 may be linked to DRX configuration #1, and BWP #2 may be linked to DRX configuration #2. The BS and the UE may change the DRX configuration to a DRX configuration linked to the BWP to which the BS and the UE are switched. In addition, BWP#1 may be linked only to DRX configuration#1, while BWP#2 may be linked to both DRX configuration#1 and DRX configuration#2. In this case, when switching to BWP#2, DRX configurations#1 and#2 may be switched dynamically. That is, by using the TDM method, DRX configuration#1 may be applied during a specific time period, and DRX configuration#2 may be applied during other time periods. In this case, DRX configuration#1 may be a DRX configuration for NES mode operation, and DRX configuration#2 may be a DRX configuration for non-NES operation. The DRX configuration for NES mode operation refers to a DRX configuration associated with NES operation or a DRX configuration configured by a cell-specific RRC (e.g., cell-specific RRC signaling / parameters). Depending on the DRX configuration for NES mode operation, the UE may not perform PDCCH monitoring during active time in the DRX cycle, and during time periods outside the active time, the UE may omit reception of common signals / channels such as SSB / SIB1, or only receive common signals / channels with long periodicity.In addition, when signals such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS are configured (semi-statically configured or pre-configured (for example, via RRC signaling)) to be repeatedly transmitted / received during time periods outside active times, compared to general DRX operations in which repetitions are performed during time periods outside active times, for a DRX configuration intended for NES mode operation, even if signals and channels such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS are configured to be repeatedly transmitted / received during time periods outside active times, transmission / reception is not performed on resources used for these signals and channels.

[0227] <Method #2> Transmission / reception method when DRX configuration and NES mode are configured / indicated to the UE

[0228] <Method #2-1> If the BS is capable of configuring multiple DRX groups for NES purposes for the UE in addition to the primary DRX group and the secondary DRX group, the BS may assign indexes to the respective DRX groups, using specific DRX indexes for DRX configurations that operate in the same manner as conventional UE DRX, and other DRX indexes for DRX configurations for NES mode operation. By indicating the index, the BS may configure / indicate whether the UE needs to perform DRX operation or NES operation. In this case, for the DRX configuration for NES mode operation, the UE may skip / omit PDCCH reception during the active time period, or may not receive CSI-RS outside the active time period. Similarly, during time periods outside the active time, the UE may not receive CSI-RS or even SSB, operating differently from conventional DRX operation. The DRX configuration for NES mode operation refers to a DRX configuration associated with NES operation or a DRX configuration configured by cell-specific RRC (e.g., cell-specific RRC signaling / parameters). The above method can be applied not only to C-DRX (i.e., connected mode DRX) but also to I-DRX (idle mode DRX). For example, if the BS provides multiple I-DRX configurations to the UE and indicates the same index as the existing I-DRX configuration, the UE may wake up at the periodicity of the DRX cycle to check the paging on the PO that the UE should monitor. However, when the I-DRX index configured for NES purposes is indicated, the UE may be allowed to skip specific POs by monitoring only on POs with a longer periodicity (than one DRX cycle) or monitoring only odd or even POs starting from the existing POs.

[0229] <Method #2-2> According to the provided DRX configuration, the UE performs PDCCH monitoring while the onDuration timer is running within the DRX cycle. When the UE receives a PDCCH, the UE starts the inactivity timer and maintains an active state during the corresponding time period. Once the timer expires, the UE may enter sleep mode and stop performing PDCCH monitoring until the next onDuration. For example, when the UE is configured with C-DRX, an onDuration is provided to the UE, and during each onDuration in the DRX cycle, the UE performs monitoring for PDCCH reception in each time slot. If the UE receives a PDCCH during the onDuration, the UE may wait for a transmit / receive schedule from the BS until the inactivity timer expires after it is started. In addition, when the retransmission timer is running, the UE maintains an active state to facilitate retransmission. Here, the active time within the DRX cycle refers to the union of the periods during which the UE performs PDCCH monitoring in each time slot while operating according to the DRX configuration provided by the BS. Alternatively, in some implementations, the active time may be limited to a period during which the onDuration timer is running, or the active time may be limited to a period corresponding to the union of the time period during which the onDuration timer is running and the time period during which the inactivity timer is running. In addition, when the timer (used to define / determine the active time) expires, or when the UE receives a DRX command during the active time, the UE enters the inactive time, during which the UE does not receive the PDCCH until the next onDuration in the subsequent DRX cycle. In a general DRX configuration, if signals such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS are configured to be repeatedly transmitted / received (semi-statically (e.g., via RRC signaling)), the UE may transmit / receive signals even during time periods outside the active time. However, if the active period of DRX operation or the resources configured to be repeatedly transmitted such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS overlaps with the time period in which the UE operates in NES mode, the following method may be applied to UE transmission / reception, which is different from the conventional operation. In addition, regardless of the DRX operation of the BS (e.g., the time period based on the BS not transmitting or receiving and the periodic repeated time period), if the signals and channels configured to be repeatedly transmitted / received overlap with the time period in which the UE operates in NES mode, the following method may be applied.

[0230] >(2-2-1) The UE may postpone or extend timers related to DRX operation (e.g., onDuration timer, inactivity timer, retransmission timer, etc.). In this case, postponement means that if the activity time is expected to overlap with the NES cycle, the UE may delay starting the timer until the end of the NES cycle. After the end of the NES cycle, the timer may be started immediately or after a pre-configured / indicated offset value after the end of the NES cycle.

[0231] >(2-2-2) PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS resources configured for repeated transmission / reception may be skipped / omitted / postponed (e.g., semi-statically, via RRC signaling). For example, if the PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS resources overlap with an NES time period (e.g., a predetermined time period during which a specific channel is not transmitted / received when the BS operates in NES mode, similar to cell DRX / DTX), or if the PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS resources are included in the NES time period, transmission and reception on these resources may be skipped or omitted. Alternatively, transmission and reception may be performed after the NES time period ends. In addition, for consecutive PDSCH repetitions, the PDSCH overlapping with the NES time period may be skipped / omitted / postponed, or the entire PDSCH repetition may be abandoned.

[0232] >(2-2-3) For DL / UL signals (e.g., PDSCH / PUSCH / PUCCH / SRS / CSI-RS) that are not (e.g., semi-statically) configured for repeated transmission / reception but can be dynamically scheduled by DL assignment or UL grant, as an exception, even if these DL / UL signals are scheduled during the NES mode time period, transmission / reception can still be performed according to the BS's scheduling. Alternatively, if any of the above dynamically scheduled DL / UL signals overlaps with the NES time period, similar to the semi-static DL / UL signals and channels, the UE may discard or ignore the scheduling indication and not perform transmission / reception.

[0233] <Method #2-3> In the above-proposed method, for timers such as an inactivity timer, a retransmission timer, and / or an onDuration timer included in a C-DRX configuration, when multiple cells are configured for a UE configured with a DRX configuration, if the timer of a cell is skipped or postponed for NES mode operation on a specific cell, this may affect not only the timer of the cell but also the timers of all cells. Therefore, in order to operate only a specific cell in NES mode instead of all cells configured for the UE, cells belonging to the same DRX group need to be grouped in advance. If there is a cell that the BS expects to operate in NES mode, the timer of the cell may be skipped or postponed based on a cell subgroup, where the cell subgroup refers to a cell subgroup to which the corresponding cell belongs.

[0234] In some implementations of the present disclosure, a DRX configuration for NES purposes (or a cell-specific DRX configuration) refers to a (cell-specific) DTX / DRX pattern or an active / inactive pattern in which a BS performs transmission / reception to a minimum or completely shuts down transmission / reception during a predefined or preconfigured time period (in a standard document), and a time period during which the BS performs normal operations is periodically repeated. For example, in the case of a DRX configuration for NES purposes, the UE may not perform PDCCH monitoring during the active time within the DRX cycle, and during the time period outside the active time, the UE may omit receiving signals such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS of SSB / SIB1 (semi-statically (e.g., via RRC signaling)) configured for repeated transmission / reception during the time period outside the active time, and the UE may not perform transmission / reception on the resources used for these signals and channels. In addition, when cell-specific DTX / DRX is configured or applied, an NES mode / state may be defined. When the NES mode / state is configured / indicated, the UE and the BS may turn off the transmission / reception of some or all DL / UL signals, reduce the amount of frequency resources used for transmission / reception, reduce the number of antenna ports used for transmission, or reduce the transmission power, so as to save energy during a specific time period when the BS and the UE operate in the NES mode, thereby saving energy. In addition, the BWP for NES purposes may refer to a specific BWP that is switched when the NES mode=ON is indicated. The BWP may be a BWP with a small amount of frequency resources among the BWPs configured for the UE, such as a BWP including a very small number of RBs. If the BS operates in a non-NES mode (i.e., when the NES mode=OFF is indicated / configured for the UE in the cell), it is expected that the transmission / reception of DL / UL signals is performed in the same manner as normal BS operation. In addition, the DRX configuration for NES purposes may be the same as the conventional UE C-DRX / I-DRX configuration. (For example, although UE C-DRX and I-DRX are configurations for UE energy saving, the BS can also save energy. If the BS appropriately configures the on / off cycles of each UE (for example, aligning the ON cycles of all UEs), the BS can also achieve energy saving. As a result, the C-DRX / I-DRX configuration configured for the UE can be one of the DRX configurations for NES purposes.) In addition, the DRX configuration for NES purposes may also refer to the dynamic indication of the time domain on / off pattern of (multiple) predetermined DL / UL signals and channels through L1 signaling (for example, group common DCI) or L2 signaling (for example, MAC CE).

[0235] The methods described in Method #1 and Method #2 can be applied individually or together.

[0236] According to some implementations of the present disclosure, since different levels of sleep modes or DRX configurations may be applied according to the situation of the BS, energy of both the BS and the UE may be operated more efficiently.

[0237] According to some implementations of the present disclosure, the sleep mode or DRX configuration may be associated with the configuration of frequency domain / time domain / space domain / power domain resources, so that a change in one of the DRX configurations (or sleep mode) may result in a change in the associated configuration, thereby reducing signaling overhead.

[0238] In a conventional DRX configuration, changes are made through signaling from an RRC layer higher than a physical layer or a MAC layer. In contrast, according to some implementations of the present disclosure, from the perspective of a cell, multiple sleep modes or DRX configurations applicable to the cell may be provided. The BS may indicate one of multiple sleep modes or DRX configurations through a group-common DCI or a group-common MAC CE, and may relatively quickly change the DRX configuration or sleep mode to be applied to the cell.

[0239] In addition, compared with traditional DRX in which a cell is associated with only one DRX parameter set, according to some implementations of the present disclosure, a cell may be associated with multiple DRX parameter sets.

[0240] In addition, compared with conventional DRX in which DRX / DTX is controlled in the time domain, according to some implementations of the present disclosure, DRX / DTX may also be controlled in the frequency domain, the space domain, and / or the power domain.

[0241] In addition, according to some implementations of the present disclosure, the BS may control energy usage more accurately based on the DRX configuration and the NES mode.

[0242] In addition, according to some implementations of the present disclosure, energy saving of a BS or a network may be achieved while minimizing the impact on data communication between a UE and the BS.

[0243] Fig.15 A flow of DL signal reception by a UE according to some implementations of the present disclosure is shown.

[0244] The UE may perform operations according to some implementations of the present disclosure in association with DL signal reception. The UE may include: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connectable to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A processing device for a UE may include: at least one processor; and at least one computer memory, which is operatively connectable to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program including instructions, which when executed by at least one processor cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer program or computer program product may include instructions, which are recorded on at least one computer-readable (non-transitory) storage medium and when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure.

[0245] The method performed by the UE or the operation of the UE, the processing device, the computer-readable (non-temporary) storage medium and / or the computer program product may include: receiving multiple DRX configurations associated with different resources in at least one of the frequency domain, the time domain, the spatial domain or the power domain (S1501); and based on receiving a first group of common DL signals indicating a first DRX configuration related to a cell (S1503), performing PDCCH monitoring during the active time according to the first DRX configuration (S1505).

[0246] In some implementations, the method or operations may include: detecting an SSB on a cell; and acquiring time and frequency synchronization with the cell based on the SSB.

[0247] In some implementations, the plurality of DRX configurations may include a DRX configuration associated with a BWP different from a BWP associated with the first DRX configuration.

[0248] In some implementations, the plurality of DRX configurations may include a DRX configuration associated with a time domain on / off pattern that is different from a time domain on / off pattern associated with the first DRX configuration.

[0249] In some implementations, the plurality of DRX configurations may include DRX configurations associated with a number of antenna ports that is different than the number of antenna ports associated with the first DRX configuration.

[0250] In some implementations, the plurality of DRX configurations may include a DRX configuration associated with a power parameter that is different from a power parameter associated with the first DRX configuration.

[0251] In some implementations, the method or operation may include: performing overlapping DL reception or UL transmission even if the DL reception or UL transmission configured to be repeatedly performed overlaps with the inactivity time according to the first DRX configuration.

[0252] In some implementations, the method or operation may include: receiving a configuration related to a network energy saving mode; and omitting overlapping DL reception or UL transmission configured to be repeatedly performed based on the overlap with a time period for the network energy saving mode.

[0253] In some implementations, the method or operation may include: receiving a configuration related to a network energy saving mode; and performing overlapping DL reception or UL transmission based on DL reception or UL transmission overlapping with a time period for the network energy saving mode being scheduled by a DCI format.

[0254] Fig.16 A flow of DL signal transmission by a BS according to some implementations of the present disclosure is shown.

[0255] The BS may perform operations according to some implementations of the present disclosure in association with DL signal transmission. The BS may include: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connectable to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A processing device for a BS may include: at least one processor; and at least one computer memory, which is operatively connectable to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable (non-volatile) storage medium may store at least one computer program including instructions, which when executed by at least one processor cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer program or computer program product may include instructions, which are recorded on at least one computer-readable (non-volatile) storage medium and when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure.

[0256] The method performed by the BS or the operations of the BS, the processing device, the computer-readable (non-temporary) storage medium and / or the computer program product may include: sending multiple DRX configurations associated with different resources in at least one of the frequency domain, the time domain, the spatial domain or the power domain, respectively (S1601); and based on sending a first group of common downlink signals indicating a first DRX configuration related to a cell (S1603), performing PDCCH transmission during an active time according to the first DRX configuration (S1605).

[0257] In some implementations, the method or operation may include sending the SSB on the cell.

[0258] In some implementations, the method or operations may include receiving a RACH associated with the SSB.

[0259] In some implementations, the plurality of DRX configurations may include a DRX configuration associated with a BWP different from a BWP associated with the first DRX configuration.

[0260] In some implementations, the plurality of DRX configurations may include a DRX configuration associated with a time domain on / off pattern that is different from a time domain on / off pattern associated with the first DRX configuration.

[0261] In some implementations, the plurality of DRX configurations may include DRX configurations associated with a number of antenna ports that is different than the number of antenna ports associated with the first DRX configuration.

[0262] In some implementations, the plurality of DRX configurations may include a DRX configuration associated with a power parameter that is different from a power parameter associated with the first DRX configuration.

[0263] In some implementations, the method or operation may include: performing overlapping DL transmission or UL reception even if the DL transmission or UL reception configured to be repeatedly performed overlaps with the inactivity time according to the first DRX configuration.

[0264] In some implementations, the method or operation may include: sending a configuration related to a network energy saving mode; and omitting overlapping DL transmission or UL reception configured to be repeatedly performed based on the overlap with a time period for the network energy saving mode.

[0265] In some implementations, the method or operation may include: sending a configuration related to the network energy saving mode; and performing overlapping DL transmission or UL reception based on the DL transmission or UL reception overlapping with the time period for the network energy saving mode being scheduled by the DCI format.

[0266] The examples of the present disclosure as described above have been presented to enable those of ordinary skill in the art to implement and practice the present disclosure. Although the present disclosure is described with reference to the examples, those skilled in the art may make various modifications and changes in the examples of the present disclosure. Therefore, the present disclosure is not intended to be limited to the examples set forth herein, but to conform to the widest scope consistent with the principles and features disclosed herein.

[0267] Implementations of the present disclosure may be used in a BS, a UE, or other devices in a wireless communication system.

Claims

1. A method for receiving a downlink signal by a user equipment UE in a wireless communication system, the method comprising the following steps: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; acquiring time and frequency synchronization with the cell based on the SSB; receiving a plurality of discontinuous reception (DRX) configurations; and performing physical downlink control channel (PDCCH) monitoring during an active time according to a first DRX configuration based on receiving a first set of common downlink signals indicating a first DRX configuration related to the cell among the plurality of DRX configurations, The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain or power domain.

2. The method according to claim 1, wherein: The plurality of DRX configurations comprises a DRX configuration associated with a BWP different from a bandwidth part BWP associated with the first DRX configuration.

3. The method according to claim 1, wherein: The plurality of DRX configurations include a DRX configuration associated with a time domain on / off pattern different from a time domain on / off pattern associated with the first DRX configuration.

4. The method according to claim 1, wherein: The plurality of DRX configurations includes a DRX configuration associated with a number of antenna ports that is different from a number of antenna ports associated with the first DRX configuration.

5. The method according to claim 1, wherein: The plurality of DRX configurations includes a DRX configuration associated with a power parameter different from a power parameter associated with the first DRX configuration.

6. The method according to claim 1, comprising the steps of: Even when downlink reception or uplink transmission configured to be repeatedly performed overlaps with the inactivity time according to the first DRX configuration, the overlapping downlink reception or uplink transmission is performed.

7. The method according to claim 1, comprising the steps of: receiving a configuration related to a network energy saving mode; as well as Based on the fact that the downlink reception or uplink transmission configured to be repeatedly performed overlaps with the time period for the network energy saving mode, the overlapping downlink reception or uplink transmission is omitted.

8. The method according to claim 1, comprising the steps of: receiving a configuration related to a network energy saving mode; as well as Based on the fact that the downlink reception or uplink transmission overlapping with the time period for the network power saving mode is scheduled by a downlink control information DCI format, the overlapping downlink reception or uplink transmission is performed.

9. A user equipment UE configured to receive a downlink signal in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; acquiring time and frequency synchronization with the cell based on the SSB; receiving a plurality of discontinuous reception (DRX) configurations; and performing physical downlink control channel (PDCCH) monitoring during an active time according to a first DRX configuration based on receiving a first set of common downlink signals indicating a first DRX configuration related to the cell among the plurality of DRX configurations, The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain or power domain.

10. A processing device in a wireless communication system, the processing device comprising: at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; acquiring time and frequency synchronization with the cell based on the SSB; receiving a plurality of discontinuous reception (DRX) configurations; and performing physical downlink control channel (PDCCH) monitoring during an active time according to a first DRX configuration based on receiving a first set of common downlink signals indicating a first DRX configuration related to the cell among the plurality of DRX configurations, The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain or power domain.

11. A computer-readable storage medium configured to store at least one program code comprising instructions that, when executed, cause at least one processor to perform operations comprising: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; acquiring time and frequency synchronization with the cell based on the SSB; receiving a plurality of discontinuous reception (DRX) configurations; and performing physical downlink control channel (PDCCH) monitoring during an active time according to a first DRX configuration based on receiving a first set of common downlink signals indicating a first DRX configuration related to the cell among the plurality of DRX configurations, The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain or power domain.

12. A method for sending a downlink signal by a base station BS to a user equipment UE in a wireless communication system, the method comprising the following steps: Sending a synchronization signal block SSB on the cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH; sending a plurality of discontinuous reception (DRX) configurations; and transmitting a physical downlink control channel (PDCCH) during an active time according to a first DRX configuration based on transmitting a first set of common downlink signals indicating a first DRX configuration related to the cell among the plurality of DRX configurations, The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain or power domain.

13. A base station BS configured to send a downlink signal to a user equipment UE in a wireless communication system, the BS comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Sending a synchronization signal block SSB on the cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH; sending a plurality of discontinuous reception (DRX) configurations; and transmitting a physical downlink control channel (PDCCH) during an active time according to a first DRX configuration based on transmitting a first set of common downlink signals indicating a first DRX configuration related to the cell among the plurality of DRX configurations, The multiple DRX configurations are respectively associated with different resources in at least one of the frequency domain, time domain, space domain or power domain.

14. The BS according to claim 13, wherein: The plurality of DRX configurations comprises a DRX configuration associated with a BWP different from a bandwidth part BWP associated with the first DRX configuration.

15. The BS according to claim 13, wherein: The plurality of DRX configurations include a DRX configuration associated with a time domain on / off pattern different from a time domain on / off pattern associated with the first DRX configuration.

16. The BS according to claim 13, wherein: The plurality of DRX configurations includes a DRX configuration associated with a number of antenna ports that is different from a number of antenna ports associated with the first DRX configuration.

17. The BS according to claim 13, wherein: The plurality of DRX configurations includes a DRX configuration associated with a power parameter different from a power parameter associated with the first DRX configuration.

18. The BS according to claim 13, wherein: The operations include: Even when downlink transmission or uplink reception configured to be repeatedly performed overlaps with the inactivity time according to the first DRX configuration, the overlapping downlink transmission or the uplink reception is performed.

19. The BS according to claim 13, wherein: The operations include: Sending configuration related to network energy saving mode; and Based on the fact that the downlink transmission or uplink reception configured to be repeatedly performed overlaps with the time period for the network power saving mode, the overlapping downlink transmission or uplink reception is omitted.

20. The BS according to claim 13, wherein: The operations include: Sending configuration related to network energy saving mode; and Based on the fact that downlink transmission or uplink reception overlapping with the time period for the network power saving mode is scheduled by a downlink control information DCI format, the overlapping downlink transmission or uplink reception is performed.

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