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

Abstract

A UE may include receiving a slot configuration providing slot formats for slots, where each slot format is at least a combination of downlink symbols, uplink symbols, or flexible symbols; performing PDCCH monitoring for a first DCI format related to the specific mode; determining, on the basis of detecting the first DCI format, a symbol for a specific mode among symbols of a specific type configured by the slot configuration; and operating in the particular mode in the symbols for the particular mode.

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] According to 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. The method may include the following steps: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol; performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining a symbol for a specific mode among symbols of a specific type configured by the slot configuration based on detecting the first DCI format; and operating in a specific mode in a symbol for a specific mode.

[0012] According to another aspect of the present disclosure, a user equipment (UE) for receiving a downlink signal in a wireless communication system is provided. The UE may include at least one transceiver, at least one processor, and at least one computer memory, the at least one computer memory being operatively connected to the at least one processor and storing instructions, the instructions causing the at least one processor to perform operations when executed. The operations include: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol; performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining a symbol for a specific mode among symbols of a specific type configured by the slot configuration based on detecting the first DCI format; and operating in a specific mode in a symbol for a specific mode.

[0013] According to another aspect of the present disclosure, a processing device in a wireless communication system is provided. The processing device includes at least one processor and at least one computer memory, the at least one computer memory is operatively connected to the at least one processor and stores instructions, and the instructions, when executed, cause the at least one processor to perform operations. The operations may include: receiving a radio resource control (RRC) configuration including a slot configuration that provides a slot format for a slot, each slot format being at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol; performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; based on detecting the first DCI format, determining a symbol for a specific mode among symbols of a specific type configured by the slot configuration; and operating in a specific mode in a symbol for a specific mode.

[0014] According to another aspect of the present disclosure, a computer-readable storage medium is provided. The storage medium may store at least one computer program code including instructions, which, when executed, causes at least one processor to perform operations, the operations may include: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol; performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining a symbol for a specific mode among symbols of a specific type configured by the slot configuration based on detecting the first DCI format; and operating in a specific mode in a symbol for a specific mode.

[0015] According to another aspect of the present disclosure, a method for transmitting a downlink signal by a base station (BS) to a user equipment (UE) in a wireless communication system is provided. The method may include the following steps: transmitting a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol; performing a physical downlink control channel (PDCCH) transmission for a first downlink control information (DCI) format related to a specific mode; and operating in a specific mode in a symbol for a specific mode among symbols of a specific type configured by the slot configuration based on transmitting the first DCI format.

[0016] According to another aspect of the present disclosure, a base station (BS) for transmitting a downlink signal to a user equipment (UE) in a wireless communication system is provided. The BS includes at least one transceiver, at least one processor, and at least one computer memory, the at least one computer memory being operatively connected to the at least one processor and storing instructions, which, when executed, cause the at least one processor to perform operations. The operations may include: sending a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol; performing a physical downlink control channel (PDCCH) transmission for a first downlink control information (DCI) format related to a specific mode; and operating in a specific mode in a symbol for a specific mode among symbols of a specific type configured by the slot configuration based on sending the first DCI format.

[0017] According to various aspects of the present disclosure, the configured time slot may be provided through a radio resource control (RRC) configuration.

[0018] According to various aspects of the present disclosure, the time slot configuration may be determined via RRC configuration and the second DCI format. Here, the RRC configuration may include a plurality of time slot format combinations, and the second DCI format may include information indicating one of the plurality of time slot format combinations.

[0019] According to various aspects of the present disclosure, the first DCI format may include information indicating a symbol used for a specific mode.

[0020] According to various aspects of the present disclosure, the RRC configuration may include configuration regarding a specific type.

[0021] According to various aspects of the present disclosure, each slot format is a combination of a downlink symbol, an uplink symbol, a flexible symbol, and an N symbol, where the N symbol may be a symbol that can be used for a specific mode.

[0022] According to various aspects of the present disclosure, the symbol type may include at least one of downlink, uplink, or flexible.

[0023] According to various aspects of the present disclosure, the symbol type may include at least one of downlink, uplink, flexible, or N.

[0024] According to various aspects of the present disclosure, the first DCI format may be received via a group-common PDCCH.

[0025] According to various aspects of the present disclosure, the first DCI format may include information about a time period during which a specific mode is turned on, and symbols in a time slot that overlap with the time period and are configured as a specific type through a time slot configuration may be determined as symbols for the specific mode.

[0026] 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.

[0027] Beneficial Effects

[0028] 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.

[0029] 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.

[0030] 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

[0031] 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:

[0032] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown;

[0033] Figure 2 is a block diagram illustrating an example of a communication device capable of executing the method according to the present disclosure;

[0034] Figure 3 Another example of a wireless device capable of performing implementations of the present disclosure is shown;

[0035] Figure 4 An example of a frame structure used in a wireless communication system based on the 3rd Generation Partnership Project (3GPP) is shown;

[0036] Figure 5 a resource grid showing time slots;

[0037] Figure 6 shows the time slot structure available in a 3GPP based system;

[0038] Figure 7 shows the time slot configuration via RRC signaling;

[0039] Figure 8 shows the predefined time slot format;

[0040] Fig. 9 Showing the time slot format combination;

[0041] Fig.10 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.11 illustrates discontinuous reception (DRX) operations suitable for implementations of the present disclosure;

[0043] Fig.12 A flow chart showing a downlink (DL) signal reception process by a user equipment (UE) according to some implementations of the present disclosure; and

[0044] Fig.13 A flow of DL signal transmission by a base station (BS) according to some implementations of the present disclosure is shown. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.).

[0050] 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".

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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).

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] In the present disclosure, 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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}.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Figure 4 An example of a frame structure used in a 3GPP-based wireless communication system is shown.

[0085] 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.

[0086] 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 ).

[0087] [Table 1]

[0088] 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

[0089] 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.

[0090] [Table 2]

[0091] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 2 12 40 4

[0092] 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}.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] Figure 6The time slot structure used in a 3GPP-based system is shown. In all 3GPP-based systems (e.g., in NR systems), each time slot may have a self-contained structure that includes i) a DL control channel, ii) DL or UL data, and / or iii) a UL control channel. For example, the first N symbols in a time slot may be used to send a DL control channel (hereinafter, a DL control region), and the last M symbols in a time slot may be used to send a UL control channel (hereinafter, a UL control region), where N and M are integers other than negative numbers. The resource region (hereinafter, a data region) between the DL control region and the UL control region may be used to send DL data or UL data. The symbols in a single time slot may be divided into groups of consecutive symbols that may be used as DL symbols, UL symbols, or flexible symbols. Hereinafter, information indicating how each symbol in a time slot is used will be referred to as a time slot format. For example, a time slot format may define which symbols in a time slot are used for UL and which symbols in a time slot are used for DL.

[0098] The slot format can be configured in a static, semi-static or fully dynamic manner. Static and semi-static slot configuration can be performed using RRC, and dynamic slot configuration can be configured using PDCCH DCI. When the network does not provide slot configuration, all slots / symbols can be considered flexible by default. Slot configuration via RRC can be obtained by providing tdd-UL-DL-ConfigurationCommon of cell-specific DL / UL patterns to all UEs in the cell and / or providing tdd-UL-DL-ConfigurationDedicated of UE-specific DL / UL patterns that modify / allocate (flexible) slots and symbols that are not allocated through tdd-UL-DL-ConfigurationCommon.

[0099] For example, when the BS is intended to operate the serving cell in time division duplex (TDD) mode, the BS may configure UL and DL allocation patterns for the serving cell through high-layer (e.g., RRC) signaling. For example, the following parameters may be used to configure the TDD DL-UL pattern:

[0100] - A reference subcarrier spacing, which is used to determine the time domain boundaries in the UL-DL pattern that is common across all subcarrier-specific carriers, independent of the actual subcarrier spacing used for data transmission;

[0101] -dl-UL-TransmissionPeriodicity, which provides the periodicity of the DL-UL pattern;

[0102] -nrofDownlinkSlots, which provides the number of consecutive full DL slots at the beginning of each DL-UL pattern, where a full DL slot is a slot with only DL symbols;

[0103] -nrofDownlinkSymbols which provides the number of consecutive DL symbols at the beginning of the slot immediately following the last full DL slot;

[0104] -nrofUplinkSlots which provides the number of consecutive full UL slots at the end of each DL-UL pattern, where a full UL slot is a slot with only UL symbols; and

[0105] -nrofUplinkSymbols which provides the number of consecutive UL symbols at the end of the slot immediately preceding the first full UL slot.

[0106] The remaining symbols that are not configured as DL symbols or UL symbols among the symbols in the DL-UL pattern are flexible symbols.

[0107] If the configuration of the TDD DL-UL pattern, i.e., the TDD UL-DL configuration (e.g., tdd-UL-DL-ConfigurationCommon or tdd-UL-DLConfigurationDedicated) is provided to the UE through high-layer signaling, the UE sets the slot format per slot over multiple slots based on the configuration. When tdd-UL-DL-ConfigurationDedicated is not provided, the UE uses only tdd-UL-DL-ConfigurationCommon to derive the slot configuration.

[0108] Figure 7 The time slot configuration via RRC signaling is shown. Figure 7 In the example, it is assumed that the TDD UL-DL pattern is configured by the following parameters: reference subcarrier spacing configuration u = 3, dl-UL-TransmissionPeriodicity P = 2.5ms, total number of time slots = P*2 u =20,nrofDownlinkSlots d slots =6, nrofUplinkSlots u slots =4,nrofDownlinkSymbols d sym =4 and nrofUplinkSymbols u sym = 10. In this case, the total number of time slots = P*2 u =20.

[0109] As described above, slot configuration using RRC may be performed in a cell-specific and / or UE-specific manner, which may leave some flexible slots / symbols unallocated. The remaining flexible symbols may be dynamically reconfigured using layer 1 signaling.

[0110] Figure 8 Shows the defined time slot format, Fig. 9 Shows the time slot format combination. Figure 8 and Fig. 9 In the , D represents DL symbol, U represents UL symbol, and F represents flexible symbol. Fig. 9 The example shows a case where the time slot format combination is a combination of two time slot formats of two consecutive time slots, but each time slot format combination in the present disclosure can be a combination of one or more time slot formats (for example, a time slot format combination indicated by a combination of one or more time slot format indices).

[0111] In order to indicate which time slot format is used in a specific time slot among the predefined time slot formats, the BS can configure a set of time slot format combinations applicable to the corresponding service cell for each cell of the service cell set through high-level (e.g., RRC) signaling, and enable the UE to monitor the group common PDCCH of the time slot format indicator (SFI) through high-level (e.g., RRC) signaling (e.g., information element (IE) SlotFormatIndicator). In the following, the DCI carried by the group common PDCCH of the SFI will be referred to as SFIDCI. DCI format 2_0 is used as SFIDCI. For example, for each service cell in the service cell set, the BS can provide the UE with the (starting) position of the time slot format combination ID (i.e., SFI index) of the corresponding service cell in the SFIDCI, the set of time slot format combinations applicable to the service cell, and the reference subcarrier spacing configuration of each time slot format in the time slot format combination indicated by the SFI index value in the SFIDCI. One or more slot formats are configured for each slot format combination in a set of slot format combinations, and a slot format combination ID (i.e., SFI index) is assigned to the slot format combination. For example, when the BS intends to configure a slot format combination with N slot formats, N slot format indices among the slot format indices of the predefined slot formats may be indicated for the slot format combination. In order to configure the group common PDCCH for the UE to monitor the SFI, the BS informs the UE of the SFI-RNTI corresponding to the radio network temporary identifier (RNTI) for the SFI and the total length of the DCI payload with the CRC scrambled with the SFI-RNTI. The SFI index field in the SFIDCI (e.g., DCI format 2_0) indicates to the UE the slot format of each slot within a plurality of slots of each DL BWP or each UL BWP starting from the slot in which the UE detects the SFIDCI format, where the number of slots is greater than or equal to the PDCCH monitoring cycle of the SFIDCI. When the PDCCH is detected based on the SFI-RNTI, the UE can determine the slot format of the corresponding serving cell from the SFI index of the serving cell among the SFI indexes in the DCI payload in the PDCCH. Figure 8 and Fig. 9, when the serving cell is configured as Fig. 9 When the time slot format combination illustrated in the example, and the SFI index = 0 is indicated for the serving cell through SFIDCI, the UE receiving the SFIDCI can apply the time slot format combination with SFI index = 0 for the time slot of the serving cell.

[0112] Symbols indicated as flexible symbols by the TDD DL-UL pattern configuration may be indicated as UL symbols, DL symbols or flexible symbols by SFIDCI.Symbols indicated as DL / UL symbols by the TDD DL-UL pattern configuration are not overwritten by SFIDCI as UL / DL symbols or flexible symbols.

[0113] If the TDD DL-UL pattern is not configured, the UE determines whether each time slot is used for UL or DL ​​and determines the symbol allocation in each time slot based on the SFIDCI and / or DCI used to schedule or trigger DL or UL signal transmission (e.g., DCI format 1_0, DCI format 1_1, DCI format 1_2, DCI format 0_0, DCI format 0_1, DCI format 0_2, and DCI format 2_3).

[0114] The UE may determine the time slot format based on the following priorities for the signal that transmits the above-mentioned time slot format related information. For example, when the UE receives the time slot format related information through multiple signals, only in order to identify the purpose of the symbol flexibly indicated by the signal with a higher priority, the UE considers the indication information in the following order: time slot format information via cell-specific high-level signaling (e.g., TDD-UL-DL-ConfigurationCommon) > time slot format information via UE-specific high-level signaling (e.g., TDD-UL-DL-ConfigDedicated) > time slot format information via group common PDCCH (e.g., DCI format 2_0) > UE-specific data transmission scheduling information > measurement-related scheduling information. Therefore, when a specific symbol within a time slot is indicated to the UE in DL / UL via cell-specific RRC signaling or UE-specific RRC signaling, the UE does not expect DCI format 2_0 (or a group-specific PDCCH including DCI format 2_0) to indicate UL / DL or flexibly indicate for a specific symbol. When a specific symbol within a time slot is indicated as flexible via DCI format 2_0 (or a group-specific PDCCH including DCI format 2_0), the UE sends / receives related signals in the specific symbol only when receiving separate scheduling information (e.g., UE-specific scheduling DCI), and does not perform signal sending / reception in the specific symbol when no separate scheduling information is received.

[0115] 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.

[0116] [Table 3]

[0117] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0118] Hereinafter, physical channels available in a 3GPP-based wireless communication system will be described in detail.

[0119] 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).

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] Fig.10 An example of PDSCH TDRA caused by PDCCH and an example of PUSCH TDRA caused by PDCCH are shown.

[0126] 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).

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] -controlResourceSetId: indicates information about the identification (ID) of CORESET.

[0132] -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.

[0133] -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.

[0134] -cce-REG-MappingType: indicates the CCE to REG mapping type. Both interleaved and non-interleaved types are supported.

[0135] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0136] -tci-StatesPDCCH: Information about the Transmission Configuration Indication (TCI) state of PDCCH (e.g., TCI-StateID)

[0137] -tci-PresentInDCI: indicates whether the TCI field is included in the DCI.

[0138] -pdcch-DMRS-ScramblingID: indicates information used for initialization of the PDCCH DMRS scrambling sequence.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] The following table shows the PDCCH search space.

[0143] [Table 4]

[0144]

[0145] 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.

[0146] -searchSpaceId: indicates the ID of the SS set.

[0147] -controlResourceSetId: Indicates the CORESET associated with the SS set.

[0148] - monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring periodicity (in time slots) and the PDCCH monitoring offset (in time slots).

[0149] -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.

[0150] -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}).

[0151] -searchSpaceType: Indicates whether the SS type is CSS or USS.

[0152] -DCI format: indicates the DCI format of the PDCCH candidate.

[0153] 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.

[0154] Fig.11 1 shows a discontinuous reception (DRX) operation. Specifically, Fig.11 The DRX cycle of a UE in RRC_CONNECTED state is shown.

[0155] The UE may perform DRX operation while executing the processing and / or method according to the implementation 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 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., the DRX cycle) can be determined / configured by high-layer signaling such as RRC signaling provided by the BS to the UE.

[0156] 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.

[0157] 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.

[0158] [Table 5]

[0159]

[0160] 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.

[0161] -drx-OnDurationTimer value: Configure the duration when the DRX cycle starts.

[0162] -drx-SlotOffset value: configures the delay before starting drx-onDurationTimer.

[0163] - Value of drx-InactivityTimer: Duration after the PDCCH opportunity when the PDCCH indicates a new UL or DL ​​transmission by the MAC entity.

[0164] - Value of drxRetransmissionTimerDL (per DL HARQ process except broadcast process): configures the maximum duration until a DL retransmission is received.

[0165] - Value of drxRetransmissionTimerUL (per UL HARQ process): configures the maximum duration until a grant for UL retransmission is received.

[0166] - 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.

[0167] - 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.

[0168] -drx-LongCycleStartOffset: configures the long DRX cycle and drx-StartOffset, which defines the subframes where the long and short DRX cycles start.

[0169] -drx-ShortCycle (optional): Configure a short DRX cycle.

[0170] -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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] For efficient NES, cells may need to be turned on / off (dynamically) only during certain time periods and / or with a smaller resolution such as symbol level depending on the load conditions of the BS. A method is needed to allow the BS to freely adjust the time periods for transmission / reception on the cell without having to deactivate the cell for individual UEs or turn off the cell itself.

[0175] 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.

[0176] Hereinafter, operation of a BS in an NES mode for energy saving (ES) may mean that the BS preconfigures a plurality of shutdown periods (i.e., discontinuous transmission (DTX) and / or DRX periods) during a specific time period to shut down transmission of a specific DL signal and / or reception of a UL signal, and then dynamically indicates one of the shutdown periods to notify that the corresponding DL / UL signal will not be transmitted / received 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.

[0177] Hereinafter, multiple implementations of the present disclosure are described, which semi-statically configure a time slot format similar to a time slot format indicator (SFI) framework and indicate a time period during which a BS operates in NES mode via a specific (group common) DCI format to flexibly and / or dynamically operate the NES mode. Hereinafter, some implementations of the present disclosure are described with respect to a default operation when a UE misses a corresponding DCI format indicating a time period during which a BS operates in NES mode.

[0178] Hereinafter, NES symbols or N symbols may refer to symbols in which the UE and the BS operate in the NES mode (eg, symbols in which the UE and the BS operate in DTX and / or DRX).

[0179] Hereinafter, D / U / F may refer to downlink, uplink and / or flexible, and D / U / F / N may refer to downlink, uplink, flexible and / or NES.

[0180] Information indicating how each symbol in a slot is used is called a slot format. Hereinafter, a slot format D, U, F, or N (or a slot format of D, U, F, or N) may refer to a downlink, uplink, flexible, or NES symbol.

[0181] 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.

[0182] <Method #1> When a slot format (i.e., a slot format of D / U / F symbols within a slot) is semi-statically configured to a UE through a (e.g., cell-specific and UE-specific) higher layer signal such as RRC, and a time period (e.g., slot format) during which the UE and the BS operate in the NES mode is represented as N, a method in which the BS dynamically (e.g., in symbol units) indicates a specific time period as an operation period of the NES mode through a specific (group-common) DCI format (however, the specific (group-common) DCI format may be an extension of the existing DCI format 2_0 or a new (group-common) DCI format indicating whether the NES mode is on or off)

[0183] >A. Method of indicating a specific symbol among D / U / F symbols as an N symbol by a specific DCI format in a slot format semi-statically configured as D / U / F

[0184] >>i. Specifically, when N can be configured in addition to the time slot format of D / U / F, the BS can semi-statically configure the time slot format of N to a minimum (i.e., when the time slot format is semi-statically configured, the number or ratio of N symbols is configured to a minimum), and indicate some specific symbols among the D / U / F symbols as N symbols through a specific DCI format.

[0185] >B. A method of changing a specific symbol among D / U / F symbols overlapping with a corresponding period to an N symbol by indicating an NES mode=ON period via a specific DCI format in a slot format semi-statically configured as D / U / F

[0186] >>i. Specifically, when N can be configured in addition to the time slot format of D / U / F, the BS can semi-statically configure the time slot format of N to a maximum limit (i.e., when the time slot format is semi-statically configured, the number or ratio of N symbols is configured to a maximum limit) and indicate some N symbols as D / U( / F) symbols through a specific DCI format.

[0187] As reference Figures 6 to 9 As described, the UE can receive a semi-static time slot format from the BS through parameters tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, and determine the time slot format through a time slot format indicator (SFI) in DCI format 2_0. In this case, the types of time slot formats include downlink (D), uplink (U), and flexible (F).

[0188] The BS can save energy by turning off the transmission / reception of specific DL or UL signals and channels during a specific time period when little or no data is expected to be sent / received, controlling the amount of frequency domain resources for sending / receiving DL or UL signals and channels, controlling the number of transmission (TX) radio units (RUs), or switching to NES mode to control transmission power. The BS can configure / indicate the time period of NES mode=on to the UE to perform the transmission / reception operation for energy saving agreed / configured in advance with the BS during the corresponding time period. In this case, in some implementations of the present disclosure, similar to the existing SFI framework, the BS can semi-statically configure the time slot format (of continuous time slots) to the UE via (cell-specific and / or UE-specific) high-layer signaling such as RRC, and when the time period (e.g., time slot format) operating in NES mode is represented as N, the BS can dynamically indicate the specific time period as the NES mode operation period via a specific (group common) DCI format. In this case, the specific (group common) DCI format can be an extension of the existing DCI format 2_0 or a new (group common) DCI format indicating whether the NES mode is on or off. For example, when the BS configures the TDD UL-DL pattern of consecutive time slots via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated and indicates a time slot format combination via a specific (group common) DCI format, the UE may determine that a symbol indicated as N by the indicated time slot format combination among symbols indicated as D, U, and / or F in tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated is an NES mode operation period (e.g., DTX and / or DRX period). In some implementations, when tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated is not provided, the UE may regard all time slots / symbols as flexible and determine that a symbol indicated as N is an NES mode operation period (e.g., DTX and / or DRX period) by the time slot format combination indicated via a specific (group common) DCI format. As another example, according to the new (group common) DCI format indicating that NES mode is turned on, i) a specific type of symbol predefined / configured among the D / U / F symbols configured via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated or ii) indicated via SlotFormatIndciator and DCI format 2_0 can be the time period operating in NES mode.

[0189] By using the SFI of the existing DCI format 2_0, the BS can indicate D / U / F of the remaining F slot formats (i.e., symbols configured as F) that are not semi-statically configured as D / U to the UE, so that the UE performs the above-mentioned slot direction or transmission / reception operation symbol by symbol. However, for the time period operating in the NES mode, in some implementations of the present disclosure, in addition to the slot format configured as F (i.e., symbols configured as F), the BS can also indicate N for all slot formats configured as D / U / F (i.e., all symbols configured as D / U / F) via a specific DCI format. In other words, a subset of a symbol set configured as D and / or U and a subset of symbols configured as F via a semi-static configuration (e.g., RRC configuration) can be indicated as N via a specific DCI format. In this case, for example, according to a pre-defined / agreed / configured configuration, N can be indicated for all slot formats among the slot formats configured as D / U / F, or N can be indicated only for a specific slot format among D / U / F. For example, it may be predefined / agreed / configured that D and N may be indicated as N among the symbol types of D, U, and F through a specific DCI format, and in this case, among the symbols configured as downlink and flexible through tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, the symbol indicated as N through the specific DCI format may be determined as a time period of the NES mode.

[0190] In some implementations of the present disclosure, in addition to the slot format including only D / U / F, a semi-static slot format N may be configured. For example, N may be semi-statically configured for symbols within a slot as well as D, U, or F. In this case, in some implementations, the BS may semi-statically provide a slot configuration (e.g., a TDD UL-DL pattern) in which the N slot format has a relatively small ratio, and may indicate some specific symbols among the D / U / F symbols as N symbols through a specific DCI format. For example, when a slot is to be semi-statically configured to include D symbols, UL symbols, F symbols, and N symbols, the BS may provide a slot configuration with a relatively small ratio of N symbols when semi-statically configuring D, U, F, and N symbols for one or more consecutive slots (via cell-specific or UE-specific RRC signaling), and may indicate some D, U, and F symbols as N through a specific DCI format. In this case, for example, in addition to the symbols semi-statically configured as N, the symbols indicated as N through a specific DCI format may be determined as a time period of the NES mode. This may mean that the BS considers a mode in which the BS minimizes the time period of the NES mode and operates as a default operation mode (default mode). Therefore, when the operation according to the semi-statically configured time slot format is pre-agreed / configured as the default operation when the UE misses (e.g., fails to receive or decode) a specific DCI format indicating a time slot format of N (i.e., N symbols), the time period in which the UE operates in the NES mode can be minimized. In contrast, the method may be one of the configuration methods in which the BS mainly operates in a non-NES mode (also referred to as a normal mode), that is, mainly operates in a normal BS operation mode. For example, in some scenarios, a time period and the number of DL symbols and the number of UL symbols in the corresponding time period are semi-statically specified via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, the remaining symbols are defined as F symbols, and there may be UEs configured to monitor SFI for F symbols and UEs not configured to monitor SFI for F symbols, and in these scenarios, as UE default operation, the UE configured to monitor SFI may follow the SFI when detecting SFI and perform PDCCH monitoring when no SFI is detected, but may not perform (e.g., via RRC signaling) semi-statically configured UL / DL transmission / reception, and the UE not configured to monitor SFI may be defined as performing semi-statically configured UL / DL transmission / reception in F symbols.According to the UE default operation based on these scenarios, when N symbols are semi-statically configured (via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated), the N symbols can be the time period during which the UE and BS always operate in NES mode regardless of the SFI via the DCI format. Therefore, a BS that wants to operate in NES mode only when necessary can operate by semi-statically configuring a small number of N symbols and indicating some semi-statically configured D, U and F symbols as N via dynamic SFI only when necessary.

[0191] In some implementations, the BS may semi-statically configure the time slot format of D / U / F to the UE as before (e.g., configure the TDD UL-DL pattern via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated), and may change specific symbols among the D / U / F symbols overlapping with the corresponding period to N symbols by indicating the NES mode=ON period via a specific DCI format. For example, specific symbols (e.g., D symbols, U symbols, F symbols, D and U symbols, U and F symbols, or D and F symbols) overlapping with the NES mode=ON period among the D / U / F symbols configured via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated may be determined as N symbols. Here, the types of specific symbols (D, U, and / F) determined as N when overlapping with the NES mode=ON period may be predefined or preconfigured. In this case, in some implementations, the specific DCI format may be a format indicating the NES mode of the BS. The BS may indicate a new (group-common) DCI format for turning on / off or an extension of an existing (group-common) DCI format. The BS may indicate the NES mode = on period by indicating one of a plurality of time period candidates pre-semi-statically agreed / configured (e.g., specified in a standard document) via a specific (group-common) DCI format or by indicating one of a plurality of timer candidates pre-semi-statically agreed / configured (e.g., specified in a standard document). Based on the corresponding indication, the UE may perform the pre-agreed NES mode = on period by changing a specific symbol among the D / U / F symbols that overlaps with the period indicated as NES mode = on to an N symbol. NES mode operation. In this case, according to a pre-agreed / configured configuration, N may be indicated for all time slot formats among the time slot formats of D / U / F, or may be indicated only for a specific time slot format among D / U / F. For example, when it is pre-agreed (e.g., specified in a standard document) and / or configured (via RRC signaling) that a subset of symbols configured (or indicated) as D and F may be indicated as N via layer 1 signaling (e.g., DCI), the UE may determine the D and F symbols among the symbols configured / indicated as D and F that overlap with the NES mode = on period as the symbol period of the NES mode.

[0192] In some implementations, specifically, when a semi-static slot format N is to be configured in addition to a slot format including only D / U / F, the BS may semi-statically provide a slot configuration (e.g., TDD U-DL pattern) in which the slot format of N has a relatively large ratio, and indicate the NES mode=ON period through a specific DCI format to indicate that some specific symbols among the D / U / F symbols are the slot format of N. For example, when a slot is to be semi-statically configured to include D symbols, UL symbols, F symbols, and N symbols, the BS may provide a slot configuration with a relatively high ratio of N symbols when semi-statically configuring D, U, F, and N symbols for one or more consecutive slots (via cell-specific or UE-specific RRC signaling), and may indicate some D, U, and F symbols as N through a specific DCI format. In this case, for example, in addition to the symbol semi-statically configured as N, the symbol indicated as N through a specific DCI format among the D / U / F symbols semi-statically configured as N may be determined as a time period of the NES mode. Alternatively, in some implementations, when N and D, U, or F are to be semi-statically configured for symbols in a time slot, the BS may configure the N symbols relatively more semi-statically, and indicate some of the semi-statically configured N symbols as D / U( / F) symbols through a specific DCI format. For example, when a time slot is to be semi-statically configured to include D symbols, UL symbols, F symbols, and N symbols, the BS may provide a time slot configuration with a relatively high ratio of N symbols when semi-statically configuring D, U, F, and N symbols for one or more consecutive time slots (via cell-specific or UE-specific RRC signaling), and may indicate that some of the semi-statically configured N symbols are D / U( / F) through a specific DCI format. In this case, for example, the remaining N symbols among the semi-statically configured N symbols, except for the symbols indicated as D / U( / F) through the DCI format, may be determined as a time period of the NES mode. This may mean that the BS regards a mode in which the BS operates when the NES mode time period is maximized as a default mode. Therefore, when the UE is operated in the NES mode as a default operation upon missing a specific DCI format indicating a slot format of N (e.g., failing to receive or decode the DCI) in advance / configured, the period of time during which the UE operates in the NES mode can be maximized. Conversely, this can be one of the configuration methods for making the default operation of the BS operate in the NES mode for energy saving rather than a normal BS operation mode in which the BS operates in the non-NES mode.For example, in some scenarios, a time period and the number of DL symbols and the number of UL symbols in the corresponding time period are semi-statically specified via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, the remaining symbols are defined as F symbols, and there may be UEs configured to monitor SFI of F symbols and UEs not configured to monitor SFI of F symbols, and in these scenarios, as the UE default operation, the UE configured to monitor SFI may follow the SFI when the SFI is detected, and perform PDCCH monitoring when the SFI is not detected, but may not perform (for example, via RRC signaling) the semi-statically configured UL / DL transmission / reception, and the UE not configured to monitor SFI may be defined as performing the semi-statically configured UL / DL transmission / reception in F symbols. According to the UE default operation based on these scenarios, when N symbols are semi-statically configured (via tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated), the N symbols can be the time period during which the UE and BS always operate in NES mode regardless of the SFI via the DCI format. Therefore, a BS that wants to operate in NES mode as much as possible can operate by semi-statically configuring as many N symbols as possible and indicating some N symbols as D, U or F only when necessary.

[0193] <Method #2> When the slot format of D / U / F is configured and the time period (e.g., slot format) operating in NES mode is N, a basic operation method of the UE in the case where the DCI format 2_0 including the SFI is not received for the slot format semi-statically configured as N (or F) or the DCI is not received during the monitoring opportunity (MO) of the (group common) DCI format indicating NES mode on / off

[0194] >A. When there is a separate (group common) DCI monitoring opportunity for each time domain (T) / frequency domain (F) / spatial domain (S) / power domain (P) and the UE does not receive DCI in the MO of a specific domain,

[0195] >>i. A method in which the UE performs the NES operation indicated by the last (group common) DCI or applies a pre-configured / agreed (eg, defined in a standard document) default operation for the corresponding domain.

[0196] >>ii. Method of falling back to non-NES operation of the corresponding domain (However, when the time period after the MO in which the UE does not receive DCI is the NES mode operation time period pre-configured or indicated by the BS, the pre-configured NES technology of the specific domain can be applied.)

[0197] >B. When there is no separate (group common) DCI monitoring opportunity for each time domain (T) / frequency domain (F) / spatial domain (S) / power domain (P) (i.e., when NES operation of all domains is indicated in one MO), and the UE does not receive DCI,

[0198] >>i. A method in which the UE performs the NES operation indicated by the last (group common) DCI or applies a pre-configured / agreed (eg, defined in a standard document) default operation for each domain.

[0199] >>ii. Method of falling back to non-NES mode (i.e., NES mode = off) as the normal operation mode for all domains (However, when the time period after the MO in which the UE does not receive DCI is the NES mode operation time period pre-configured or indicated by the BS, the pre-configured NES technology for a specific domain may be applied.)

[0200] >C. When there are separate (group-common) DCI monitoring opportunities for each NES technology group and the UE does not receive DCI in the MO for a specific NES technology group,

[0201] >>i. For a group of NES technology applications, a method for applying a default operation pre-configured / agreed (e.g., defined in a standard document) to the corresponding NES technology indicated by the last (group common) DCI (e.g., indicated in the previous MO) or applying

[0202] >>ii. Method for disabling NES technology applications belonging to the corresponding NES technology group

[0203] >>iii. Method to fall back to non-NES operation as normal operation mode

[0204] >>iv. However, when the time period after the MO in which the UE fails to receive the DCI in ii and iii is the NES mode operation time period preconfigured or indicated by the BS, the preconfigured NES technology (group) may be applied, and this group of NES technologies may include a single NES technology.

[0205] >D. In the case where there are no separate MOs for the (group-common) DCI formats of the respective NES technology groups (i.e., in the case where the DCI formats indicating NES operations for all NES technology groups need to be sent in one MO), when the UE does not receive DCI indicating NES operations,

[0206] >>i. A method for applying a default operation pre-configured / agreed (eg, defined in a standard document) to the corresponding NES technology or applying the last (group common) DCI indication (indicated in the previous MO) for each NES technology group

[0207] >>ii. Method of falling back to normal operation mode, non-NES mode (i.e., NES mode = off). However, when the time period after the MO in which the UE fails to receive DCI in ii is a NES mode operation time period pre-configured or indicated by the BS, the pre-configured NES technology (group) may be applied, and this group of NES technologies may include a single NES technology.

[0208] >E. The UE may maintain these methods until the MO immediately following the MO in which the UE does not receive DCI, apply these methods for a pre-agreed / configured time period and fall back to normal operation mode which is a non-NES mode, or maintain the last indicated operation until otherwise indicated.

[0209] > Method of notifying the BS of non-reception through pre-agreed / configured specific UL signal / channel (e.g., PRACH / PUCCH / SRS / CG-PUSCH) resources when (group common) DCI is not received in MO

[0210] >Similar to the method of turning off all transmission / reception except the positioning reference signal (PRS) for the slot format configured as semi-static N when no SFI is received for the slot format configured as semi-static F

[0211] The BS can semi-statically configure U / D / F for symbols within a time slot through cell-specific or UE-specific signaling, and dynamically indicate to the UE configured to monitor DCI format 2_0 that the symbol configured as flexible is one of D / U / F. For symbols configured as F, in the case of a UE that is not configured to monitor SFI, DL / UL configured via RRC can be sent / received. In the case of a UE configured to monitor SFI, 1) when SFI is not received, only PDCCH monitoring is performed, 2) when SFI is received and flexible is indicated, DL / UL configured via RRC including PDCCH monitoring is not sent / received.

[0212] As in method #1 above, when the BS semi-statically configures the time slot format of D / U / F to the UE and the time period (e.g., time slot format) for operating in NES mode is N, if the time period for operating in NES mode is indicated by DCI format 2_0 including SFI or by a (group common) DCI format indicating NES mode on / off for the time slot format (e.g., symbol) semi-statically configured as N (or F), then when DCI is not received in the corresponding monitoring opportunity (MO), the default operation of the UE needs to be defined, just like the case where the UE configured with SFI monitoring does not receive SFI as described above.

[0213] When receiving the NES mode = on instruction from the BS, the UE may be pre-configured with operations for energy saving for each T / F / S / P domain. For example, the UE may be pre-configured (e.g., via RRC signaling) to not perform transmission on the included configured permitted PUSCH resources during a specific time period when NES mode = on, or to perform BWP switching to a pre-agreed BWP for NES, or to perform transmission / reception using only some RBs of the BW of the current UE's active BWP. Alternatively, the UE may be pre-configured with operations for energy saving when NES mode = on is indicated for each domain, such as shutting down a pre-agreed specific antenna port or transmitting at a reduced transmission power, which may be pre-configured for the UE.

[0214] There may be a separate (group common) DCI monitoring opportunity for each T / F / S / P domain, or the NES mode indication for all domains or specific domains may be performed in one MO. When there is a separate MO for each domain and the UE does not receive DCI in the MO corresponding to the specific domain, the UE may perform the NES operation indicated by the last (group common) DCI for the domain, or apply a pre-configured / agreed (e.g., defined in a standard document) default operation (e.g., a default NES operation mode pre-configured / agreed (e.g., defined in a standard) for each domain). Alternatively, for the corresponding domain for which the UE does not receive DCI, the UE may fall back to non-NES operation. However, when the time period for performing the fallback after the MO in which the DCI is not received is a NES mode operation time period pre-configured or indicated by the BS (e.g., a time period for semi-statically configuring the time slot format of N or a NES mode operation time period indicated by a group common DCI), the pre-configured NES technology for the specific domain may be applied.

[0215] When there is no separate MO of (group common) DCI format for each T / F / S / P domain (i.e., when NES operation of all domains is indicated in one MO) and the UE does not receive DCI in the MO, the UE may perform the NES operation indicated by the last (group common) DCI for each domain, or apply the default operation of pre-configuration / agreement (e.g., defined in the standard document). In this case, for example, the default operation may mean the default NES operation mode pre-configured / agreement (e.g., defined in the standard) for each domain. Alternatively, when DCI is not received in the MO, it is possible to fall back to the non-NES mode (i.e., NES mode = off) as the normal operation mode for all domains. However, when the time period for performing the fallback after the MO in which the DCI is not received is the NES mode operation time period pre-configured or indicated by the BS (e.g., the time period for semi-statically configuring the time slot format of N in the above method #1 or the NES mode operation time period indicated by the group common DCI), the pre-configured NES technology of the specific domain may be applied.

[0216] Instead of instructing the UE to use NES technology according to the T / F / S / P domain through (group common) DCI, the BS can pre-configure the NES technology group by grouping the NES technology, and configure the (group common) DCI monitoring opportunity separately according to the NES technology group. Here, the NES technology group may include two NES technologies, which skip transmission on pre-configured semi-static resources (e.g., licensed PUSCH) within a specific time period and only utilize half of the antenna ports compared to the non-NES mode. In this case, when the UE does not receive DCI in the MO of a specific NES technology group, the UE may apply the NES technology indicated by the last (group common) DCI (in the previous MO) for the corresponding NES technology group, or apply the default operation of pre-configuration / agreement (e.g., defined in the standard document). Alternatively, it is possible to turn off and only operate the NES technology belonging to the NES technology group indicated in the MO. Another method may be a method of falling back to normal operation mode, non-NES operation, where the preconfigured NES technology (group) may be applied when the time period after the MO in which no DCI is received is a NES mode operation time period preconfigured or indicated by the BS.

[0217] When there is no separate MO in the (group-common) DCI format for each NES technology group (i.e., when NES operation for all NES technology groups is indicated in one MO) and the UE does not receive DCI, the NES technology indicated by the last (group-common) DCI (in the previous MO) or the pre-configured / agreed (e.g., defined in the standard document) default operation for each NES technology group may be applied. Alternatively, the UE may fall back to normal operation mode, non-NES mode (i.e., NES mode = off), but if the time interval after the MO in which the DCI was not received is a NES mode operation time interval pre-configured or indicated by the BS (e.g., a semi-static N slot format or a NES mode operation interval indicated via a specific group-common DCI), the pre-agreed / configured default NES technology (group) may be applied.

[0218] The UE may maintain these methods until the MO immediately following the MO in which the DCI is not received, or apply these methods within a pre-agreed / configured time period and fall back to normal operation mode, non-NES mode, or maintain the last indicated operation until otherwise instructed. It may be difficult for the BS to know whether the UE has correctly received the DCI sent by the BS, so when the UE does not receive the (group common) DCI in the MO, the BS may be notified of non-reception through a pre-agreed / configured specific UL signal / channel (e.g., PRACH / PUCCH / SRS / CG-PUSCH) resource. Similar to not receiving the SFI for a time slot format semi-statically configured as F, a method of turning off all transmission / reception except PRS for a time slot format semi-statically configured as N may also be considered.

[0219] The above method #1 and method #2 can be applied individually or in combination of two or more.

[0220] According to some implementations of the present disclosure, a sleep mode or a DRX configuration may be applied at various levels according to the situation of the BS, and thus the energy of the BS and the UE may be operated more efficiently.

[0221] According to some implementations of the present disclosure, the BS may pre-semi-statically configure the time periods in which the BS can operate in energy-saving mode and shut down the transmitted / received signals / channels during the corresponding time periods, and dynamically indicate whether to operate in energy-saving mode through a group common DCI according to the actual cell situation, thereby allowing a quick response when emergency data services occur.

[0222] According to some implementations of the present disclosure, the BS may use a framework similar to SFI to control energy usage in more detail.

[0223] 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.

[0224] Fig.12 A flow of DL signal reception by a UE according to some implementations of the present disclosure is shown.

[0225] 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.

[0226] Reference Fig.12, in a method performed by a UE, a UE, a processing device, a computer-readable (non-transitory) storage medium, and / or a computer program product, the operation may include receiving a time slot configuration that provides a time slot format for a time slot (S1201). Here, each time slot format may be at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol. The method or operation may include performing physical downlink control channel (PDCCH) monitoring (S1203) for a first downlink control information (DCI) format related to a specific mode. The method or operation may include determining, based on detecting a first DCI format (S1205), a symbol for a specific mode among symbols of a specific type configured by the time slot configuration (S1207). The method or operation may include operating in a specific mode on a symbol for a specific mode.

[0227] In some implementations, the timeslot configuration may be provided via RRC configuration.

[0228] In some implementations, the slot configuration may be determined via an RRC configuration and a second DCI format. Here, the RRC configuration may include a plurality of slot format combinations, and the second DCI format may include information indicating one of the plurality of slot format combinations.

[0229] In some implementations, the first DCI format may include information indicating symbols used for a specific mode.

[0230] In some implementations, the RRC configuration may include configuration regarding a specific type.

[0231] In some implementations, each slot format is a combination of downlink symbols, uplink symbols, flexible symbols, and N symbols, where the N symbols may be symbols that may be used for a specific mode.

[0232] In some implementations, the symbol type may include at least one of downlink, uplink, or flexible.

[0233] In some implementations, the symbol type may include at least one of downlink, uplink, flexible, or N.

[0234] In some implementations, the first DCI format may be received via a group-common PDCCH.

[0235] In some implementations, the first DCI format may include information about a time period during which a specific mode is on, and determining a symbol for the specific mode may include determining a symbol configured as a specific type by a time slot configuration among symbols in a time slot that overlap with the time period as a symbol for the specific mode.

[0236] Fig.13A flow of DL signal transmission by a BS according to some implementations of the present disclosure is shown.

[0237] 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-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.

[0238] Reference Fig.13 , in a method, a BS, a processing device, a computer-readable (non-transitory) storage medium, and / or a computer program product performed by a BS, the operation may include sending a slot configuration that provides a slot format for a slot (S1301). Here, each slot format may be at least a combination of a downlink symbol, an uplink symbol, or a flexible symbol. The method or operation may include performing a physical downlink control channel (PDCCH) transmission for a first downlink control information (DCI) format related to a specific mode (S1303). The method or operation may include operating in a specific mode in a symbol for a specific mode among symbols of a specific type configured by the slot configuration based on sending a first DCI format (S1305).

[0239] In some implementations, the timeslot configuration may be provided via RRC configuration.

[0240] In some implementations, the slot configuration may be determined via an RRC configuration and a second DCI format. Here, the RRC configuration may include a plurality of slot format combinations, and the second DCI format may include information indicating one of the plurality of slot format combinations.

[0241] In some implementations, the first DCI format may include information indicating symbols used for a specific mode.

[0242] In some implementations, the RRC configuration may include configuration regarding a specific type.

[0243] In some implementations, each slot format is a combination of downlink symbols, uplink symbols, flexible symbols, and N symbols, where the N symbols may be symbols that may be used for a specific mode.

[0244] In some implementations, the symbol type may include at least one of downlink, uplink, or flexible.

[0245] In some implementations, the symbol type may include at least one of downlink, uplink, flexible, or N.

[0246] In some implementations, the first DCI format may be sent via a group-common PDCCH.

[0247] In some implementations, the first DCI format may include information about a time period during which a specific mode is turned on, and symbols configured as a specific type by the time slot configuration among symbols in the time slot that overlap with the time period may be determined as symbols for the specific mode.

[0248] 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.

[0249] 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: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being a combination of at least a downlink symbol, an uplink symbol or a flexible symbol; Performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining, based on detecting the first DCI format, a symbol for the specific mode among symbols of a specific type configured by the time slot configuration; as well as Operate in the particular mode in the symbols for the particular mode.

2. The method according to claim 1, wherein: The first DCI format includes information indicating the symbol used for the specific mode.

3. The method according to claim 1, wherein: The RRC configuration includes a configuration for the specific type.

4. The method according to claim 1, wherein: Each slot format is a combination of a downlink symbol, an uplink symbol, a flexible symbol, and N symbols, where the N symbols are symbols that can be used for the specific mode.

5. The method according to claim 3, wherein: The symbol type includes at least one of downlink, uplink, or flexible.

6. The method according to claim 4, wherein: The symbol type includes at least one of downlink, uplink, flexible, or N.

7. The method according to claim 1, wherein: The first DCI format is received via a group-common PDCCH.

8. The method according to claim 1, wherein: The first DCI format includes information about a time period during which the specific mode is turned on, and The step of determining the symbol for the specific mode includes determining, as the symbol for the specific mode, a symbol configured as the specific type by the time slot configuration among the symbols overlapping the time period in the time slot.

9. A user equipment UE for receiving 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: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being a combination of at least a downlink symbol, an uplink symbol or a flexible symbol; Performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining, based on detecting the first DCI format, a symbol for the specific mode among symbols of a specific type configured by the time slot configuration; and Operate in the particular mode in the symbols for the particular mode.

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: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being a combination of at least a downlink symbol, an uplink symbol or a flexible symbol; Performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining, based on detecting the first DCI format, a symbol for the specific mode among symbols of a specific type configured by the time slot configuration; and Operate in the particular mode in the symbols for the particular mode.

11. A computer readable storage medium storing at least one computer program code comprising instructions which, when executed, cause at least one processor to perform operations comprising: receiving a radio resource control (RRC) configuration including a slot configuration providing a slot format for a slot, each slot format being a combination of at least a downlink symbol, an uplink symbol or a flexible symbol; Performing physical downlink control channel (PDCCH) monitoring for a first downlink control information (DCI) format related to a specific mode; determining, based on detecting the first DCI format, a symbol for the specific mode among symbols of a specific type configured by the time slot configuration; as well as Operate in the particular mode in the symbols for the particular mode.

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 radio resource control (RRC) configuration including a slot configuration providing a slot format for the slot, each slot format being at least a combination of a downlink symbol, an uplink symbol or a flexible symbol; Performing physical downlink control channel (PDCCH) transmission for a first downlink control information (DCI) format related to a specific mode; as well as Based on transmitting the first DCI format, operating in the specific mode in a symbol used for the specific mode among symbols of a specific type configured by the time slot configuration.

13. A base station BS for sending 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 radio resource control (RRC) configuration including a slot configuration providing a slot format for the slot, each slot format being at least a combination of a downlink symbol, an uplink symbol or a flexible symbol; Performing physical downlink control channel (PDCCH) transmission for a first downlink control information (DCI) format related to a specific mode; as well as Based on transmitting the first DCI format, operating in the specific mode in a symbol used for the specific mode among symbols of a specific type configured by the time slot configuration.

14. The BS according to claim 13, wherein: The first DCI format includes information indicating the symbol used for the specific mode.

15. The BS according to claim 13, wherein: The RRC configuration includes a configuration for the specific type.

16. The BS according to claim 13, wherein: Each slot format is a combination of a downlink symbol, an uplink symbol, a flexible symbol, and N symbols, where the N symbols are symbols that can be used for the specific mode.

17. The BS according to claim 15, wherein: The symbol type includes at least one of downlink, uplink, or flexible.

18. The BS according to claim 16, wherein: The symbol type includes at least one of downlink, uplink, flexible, or N.

19. The BS according to claim 13, wherein: The first DCI format is transmitted via a group-common PDCCH.

20. The BS according to claim 13, wherein: The first DCI format includes information about a time period during which the specific mode is turned on, and Among the symbols in the time slot that overlap with the time period, the symbols configured as the specific type by the time slot configuration are determined as the symbols used for the specific mode.

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