Method performed by user equipment, user equipment, processing device, storage medium, method performed by base station, and base station

Abstract

This UE may: receive a first DTX configuration related to a first radio resource control (RRC) state and a second DTX configuration related to a second RRC state; on the basis that the UE is in the first RRC state, monitor a first-type downlink (DL) signal at a first period within an active section of the first DTX configuration, and monitor the first-type DL signal at a second period within a non-active section of the first DTX configuration; on the basis that the UE is in a second RRC state, monitor a second-type DL signal at a third period within an active section of the second DTX configuration, and monitor the second-type DL signal at a fourth period within a non-active section of the second DTX configuration.

Description

A method performed by a user device, a user device, a processing device and a storage medium, and a method performed by a base station and a base station

[0001] This specification relates to a wireless communication system.

[0002] Various devices and technologies, such as machine-to-machine (M2M) communication, machine type communication (MTC), and devices requiring high data transmission rates like smartphones and tablet PCs (Personal Computers), are emerging and becoming widespread. Consequently, the amount of data required to be processed in cellular networks is increasing very rapidly. To satisfy this rapidly increasing demand for data processing, technologies such as carrier aggregation and cognitive radio are being developed to efficiently utilize more frequency bands, while technologies such as multi-antenna technology and multi-BS cooperation are being developed to increase the data capacity transmitted within a limited frequency range.

[0003] As more communication devices require greater communication capacity, the need for enhanced mobile broadband (eMBB) communication is emerging compared to legacy radio access technology (RAT). In addition, massive machine type communication (mMTC), which connects multiple devices and objects to provide various services anytime and anywhere, is one of the key issues to consider in next-generation communication.

[0004] In addition, discussions are underway regarding communication systems to be designed with user equipment (UE) in mind, which is sensitive to reliability and latency. The introduction of next-generation wireless access technologies is being discussed with consideration of eMBB communication, mMTC, and ultra-reliable and low-latency communication (URLLC).

[0005] As the number of services and UEs that the network must support increases rapidly, the need for energy conservation in the network, as well as power conservation in the UEs, is gradually growing.

[0006] One technical objective of this specification is to provide methods and processes for network energy saving.

[0007] Another technical objective of this specification is to provide methods and processes for transmitting downlink signals to enable network energy saving.

[0008] The technical problems that this specification aims to solve are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art related to this specification from the detailed description below.

[0009] In one aspect of the present specification, a method by means of a user device is provided. In another aspect of the present specification, the user device is provided, comprising at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. In yet another aspect of the present specification, a processing device is provided, comprising at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. In yet another aspect of the present specification, a computer-readable non-transitory storage medium is provided, storing at least one program code including instructions that, when executed, cause the at least one processor to perform operations.The above method or above operations may include: receiving a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, wherein the plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; based on the UE being in the first RRC state, monitoring a first type downlink (DL) signal in a first period during the active period of the first DTX setting and monitoring the first type DL signal in a second period during the non-active period of the first DTX setting; and based on the UE being in the second RRC state, monitoring a second type DL signal in a third period during the active period of the second DTX setting and monitoring the second type DL signal in a fourth period during the non-active period of the second DTX setting.

[0010] In one aspect of the present specification, a method by means of a base station is provided. In another aspect of the present specification, a base station is provided comprising: at least one transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and, when executed, storing instructions that cause the at least one processor to perform operations. The method or the operations include: transmitting a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, wherein the plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the fact that the user equipment (UE) is in the first RRC state, the first type downlink (DL) signal is transmitted on the cell in a first period during the active period of the first DTX setting, and the first type DL signal is transmitted on the cell in a second period during the non-active period of the first DTX setting; and based on the fact that the UE is in the second RRC state, the second type DL signal is transmitted on the cell in a third period during the active period of the second DTX setting, and the second type DL signal is transmitted on the cell in a fourth period during the non-active period of the second DTX setting.

[0011] In each aspect of the present specification, the first cell DTX setting may include information regarding the active and non-active intervals of the first cell DTX setting, and the second cell DTX setting may include information regarding the active and non-active intervals of the second cell DTX setting.

[0012] In each aspect of the present specification, the first cell DTX setting may include information regarding the first type DL signal, information regarding the first period, and information regarding the second period.

[0013] In each aspect of the present specification, the second cell DTX setting may include information regarding the second type DL signal, information regarding the third cycle, and information regarding the fourth cycle.

[0014] In each aspect of the present specification, the first type DL signal and the second type DL signal may be synchronization signal blocks.

[0015] In each aspect of the present specification, the plurality of cell DTX / DRX settings may include a first cell DRX setting associated with the first RRC state or a second DRX setting associated with the second RRC state.

[0016] In each aspect of the present specification, the first cell DRX setting or the second DRX setting may include information regarding a physical random access channel (PRACH) mask index value for a non-active period of the cell DRX setting.

[0017] In each aspect of the present specification, the first cell DRX setting or the second DRX setting may include information regarding an uplink signal type associated with the cell DRX setting.

[0018] In each aspect of the present specification, the first RRC state may be an RRC connected state, and the second RRC state may be a state that is not an RRC connected state.

[0019] The above-mentioned problem-solving methods are merely some of the examples of this specification, and various examples reflecting the technical features of this specification can be derived and understood by a person with ordinary knowledge in the relevant technical field based on the detailed description below.

[0020] According to some implementations of this specification, methods and procedures for energy saving of networks, BS and / or UEs may be provided.

[0021] According to some implementations of this specification, methods and procedures for transmitting downlink signals can be provided to enable energy saving of the network, BS and / or UE.

[0022] The effects of this specification are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art related to this specification from the detailed description below.

[0023] The attached drawings, included as part of the detailed description to aid in understanding the implementations of this specification, provide examples of the implementations of this specification and describe the implementations of this specification together with the detailed description:

[0024] FIG. 1 illustrates an example of a communication system 1 to which the implementations of the present specification are applied;

[0025] FIG. 2 is a block diagram illustrating examples of communication devices capable of performing the method according to the present specification;

[0026] FIG. 3 illustrates another example of a wireless device capable of performing implementation(s) of the present specification;

[0027] FIG. 4 illustrates an example of a frame structure available in a 3rd generation partnership project (3GPP)-based wireless communication system;

[0028] FIG. 5 illustrates a resource grid of slots;

[0029] FIG. 6 illustrates physical channels used in a 3rd generation partnership project (3GPP)-based communication system, which is an example of a wireless communication system, and the signal transmission / reception process using them;

[0030] FIG. 7 illustrates synchronization signal (SS) / physical broadcast channel (PBCH) blocks (SSB) on a cell.

[0031] FIG. 8 is illustrated to explain the bitmaps used to indicate the SSBs actually being transmitted;

[0032] FIG. 9 illustrates the process of acquiring system information (SI);

[0033] FIG. 10 illustrates an arbitrary connection process that may be applied to the implementation(s) of the present specification;

[0034] FIG. 11 illustrates an example of time-domain resource allocation of a physical downlink shared channel (PDSCH) by a physical downlink control channel (PDCCH) and an example of time-domain resource allocation of a physical uplink shared channel (PUSCH) by a PDCCH;

[0035] FIG. 12 illustrates a discontinuous reception (DRX) operation;

[0036] FIG. 13 illustrates a case where a Long DRX cycle and a Short DRX cycle are set;

[0037] FIG. 14 illustrates paging times according to several scenarios;

[0038] FIG. 15 illustrates an operation procedure in a BS that supports network energy saving (NES) technology;

[0039] FIG. 16 illustrates the mapping relationship between random access channel (RACH) periods and SSBs;

[0040] FIG. 17 illustrates the flow of signal transmission / reception in a UE according to some implementations of the present specification;

[0041] FIG. 18 illustrates the flow of signal transmission / reception in a BS according to some implementations of the present specification.

[0042] Implementations according to this specification are described below with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary implementations of this specification and is not intended to represent the only form in which this specification may be practiced. The detailed description below includes specific details to provide a complete understanding of this specification. However, a person skilled in the art will know that this specification may be practiced without such specific details.

[0043] In some cases, to avoid ambiguity regarding the concepts of this specification, known structures and devices may be omitted or depicted in the form of block diagrams focusing on the core functions of each structure and device. Additionally, the same reference numerals are used to describe identical components throughout this specification.

[0044] In this specification, "A or B" may mean "only A," "only B," or "both A and B." Alternatively, in this specification, "A or B" may be interpreted as "A and / or B." For example, in this specification, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C."

[0045] A slash ( / ) or comma used in this specification may mean "and / or." For example, "A / B" may mean "A and / or B." Accordingly, "A / B" may mean "only A," "only B," or "both A and B." For example, "A, B, C" may mean "A, B or C."

[0046] In this specification, "at least one of A and B" may mean "only A," "only B," or "both A and B." Additionally, in this specification, the expressions "at least one of A or B" or "at least one of A and / or B" may be interpreted as synonymous with "at least one of A and B."

[0047] Additionally, in this specification, "at least one of A, B and C" may mean "only A," "only B," "only C," or "any combination of A, B and C." Also, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C."

[0048] In addition, terms such as "first," "second," etc. in this specification are used solely for the purpose of distinguishing one component from another and are not used to limit the components, nor do they limit the order or importance of the components unless specifically limited. Accordingly, the first component in one embodiment of this specification may be referred to as the second component in another embodiment, and likewise, the second component in one embodiment may be referred to as the first component in another embodiment.

[0049] In the following explanation, 'when ~, if ~, in case of ~' can be replaced with 'based on'.

[0050] In this specification, higher layer parameters may be set for the UE, pre-configured, or pre-defined. For example, the BS may transmit higher layer parameter(s) to the UE. For example, the UE may transmit parameters such as capability to the BS as higher layer parameters. For example, higher layer parameters may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0051] In this specification, information / status / parameters being "configured or pre-configured" may be interpreted as information / status / parameters being provided or pre-provided to the UE through pre-defined signaling from the BS (e.g., system information block (SIB), medium access control (MAC), radio resource control (RRC)). In this specification, information / status / parameters being "defined or pre-defined" may be interpreted as information / status / parameters being known or stored in advance by the BS and the UE without signaling between the base station and the UE.

[0052] Technical features described individually within a single drawing in this specification may be implemented individually or simultaneously.

[0053] The techniques, devices, and systems described below can be applied to various wireless multiple access systems. Examples of multiple access systems include CDMA (code division multiple access) systems, FDMA (frequency division multiple access) systems, TDMA (time division multiple access) systems, OFDMA (orthogonal frequency division multiple access) systems, SC-FDMA (single carrier frequency division multiple access) systems, and MC-FDMA (multi carrier frequency division multiple access) systems. CDMA can be implemented in wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented in wireless technologies such as GSM (Global System for Mobile communication), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution) (i.e., GERAN). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved-UTRA). UTRA is part of UMTS (Universal Mobile Telecommunication System), and 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS that utilizes E-UTRA.3GPP LTE adopts OFDMA for the downlink (DL) and SC-FDMA for the uplink (UL). LTE-A (LTE-advanced) is an evolved form of 3GPP LTE.

[0054] For the convenience of explanation, the following description assumes that this specification applies to 3GPP-based communication systems, such as LTE and NR. However, the technical features of this specification are not limited thereto. For example, even though the following detailed description is based on a mobile communication system corresponding to a 3GPP LTE / NR system, it may be applied to any other mobile communication system, except for matters specific to 3GPP LTE / NR.

[0055] For terms and technologies used in this specification that are not specifically described, reference may be made to 3GPP-based standard documents, e.g., 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300 and 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.

[0056] In the examples of this specification described below, the expression that the device "assumes" may mean that the entity transmitting the channel transmits the channel in accordance with said "assume." It may mean that the entity receiving the channel receives or decodes the channel in a form that conforms to said "assume," under the premise that the channel was transmitted in accordance with said "assume."

[0057] In this specification, UEs may be fixed or mobile and include various devices that communicate with a base station (BS) to transmit and / or receive user data and / or various control information. A UE may be referred to as Terminal Equipment, Mobile Station (MS), Mobile Terminal (MT), User Terminal (UT), Subscribe Station (SS), wireless device, Personal Digital Assistant (PDA), wireless modem, handheld device, etc. Additionally, in this specification, a BS generally refers to a fixed station that communicates with a UE and / or other BSs and exchanges various data and control information by communicating with a UE and other BSs. A BS may be referred to by other terms such as Advanced Base Station (ABS), Node-B (NB), eNB (evolved-NodeB), Base Transceiver System (BTS), Access Point, Processing Server (PS), etc. In particular, BSs of UTRAN are called Node-Bs, BSs of E-UTRAN are called eNBs, and BSs of new radio access technology networks are called gNBs. For convenience of explanation, BSs will be collectively referred to as BSs regardless of the type or version of the communication technology.

[0058] In this specification, a node refers to a fixed point capable of transmitting or receiving wireless signals by communicating with a UE. Various types of BSs may be used as nodes regardless of their designation. For example, a BS, NB, eNB, pico-cell eNB (PeNB), home eNB (HeNB), relay, repeater, etc., may serve as a node. Additionally, a node does not have to be a BS. For example, it may be a radio remote head (RRH) or a radio remote unit (RRU). RRHs, RRUs, etc. generally have a power level lower than that of a BS. Since an RRH or RRU (or RRH / RRU) is generally connected to a BS via a dedicated line such as an optical cable, cooperative communication between an RRH / RRU and a BS can be performed more smoothly compared to cooperative communication between BSs connected via wireless lines. At least one antenna is installed at a node. This antenna may refer to a physical antenna, an antenna port, a virtual antenna, or an antenna group. Nodes are also referred to as points.

[0059] In this specification, the term "cell" refers to a specific geographical area where one or more nodes provide communication services. Accordingly, in this specification, communicating with a specific cell may mean communicating with a BS or node that provides communication services to said specific cell. Furthermore, the downlink / uplink signals of a specific cell refer to downlink / uplink signals from to or to the BS or node that provides communication services to said specific cell. A cell that provides uplink / downlink communication services to a UE is specifically referred to as a serving cell. Additionally, the channel state / quality of a specific cell refers to the channel state / quality of the channel or communication link formed between the BS or node providing communication services to said specific cell and the UE. In a 3GPP-based communication system, a UE can measure the downlink channel state from a specific node using the CRS(s) transmitted by the antenna port(s) of the specific node over the CRS (Cell-specific Reference Signal) resource assigned to the specific node and / or the CSI-RS(s) transmitted over the CSI-RS (Channel State Information Reference Signal) resource.

[0060] Meanwhile, 3GPP-based communication systems use the concept of a cell to manage wireless resources, and a cell associated with wireless resources is distinguished from a cell in a geographical area.

[0061] A “cell” of a geographical area can be understood as the coverage over which a node can provide services using a carrier wave, and a “cell” of a wireless resource is associated with the bandwidth (BW), which is the frequency range configured by said carrier wave. Since downlink coverage, which is the range over which a node can transmit a valid signal, and uplink coverage, which is the range over which a valid signal can be received from a UE, depend on the carrier wave carrying the signal, the coverage of a node is also associated with the coverage of the “cell” of the wireless resource used by said node. Therefore, the term “cell” can be used to refer sometimes to the coverage of a service by a node, sometimes to a wireless resource, and sometimes to the range over which a signal using said wireless resource can reach with effective strength.

[0062] Meanwhile, 3GPP communication standards use the concept of a cell to manage radio resources. A "cell" associated with radio resources is defined as a combination of downlink resources (DL resources) and uplink resources (UL resources), that is, a combination of a DL component carrier (CC) and a UL CC. A cell can be configured as a DL resource alone or as a combination of a DL resource and a UL resource. Where carrier aggregation is supported, the linkage between the carrier frequency of a DL resource (or DL ​​CC) and the carrier frequency of a UL resource (or UL CC) can be indicated by system information. For example, the combination of DL resources and UL resources can be indicated by a System Information Block Type 2 (SIB2) linkage. Here, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When Carrier Aggregation (CA) is established, the UE has only one Radio Resource Control (RRC) connection with the network. One serving cell provides Non-Access Stratum (NAS) mobility information during RRC establishment / re-establishment / handover, and one serving cell provides security input during RRC re-establishment / handover. This cell is called a primary cell (Pcell). A Pcell is a cell operating on the primary frequency where the UE performs the initial connection establishment procedure or initiates the connection re-establishment procedure.Depending on the UE capability, secondary cells (Scells) can be configured to form a set of serving cells together with Pcells. Scells can be configured after a Radio Resource Control (RRC) connection is established and are cells that provide additional radio resources in addition to the resources of special cells (SpCells). The carrier corresponding to a Pcell in the downlink is called the Downlink Primary CC (DL PCC), and the carrier corresponding to a Pcell in the uplink is called the UL Primary CC (UL PCC). The carrier corresponding to an Scell ​​in the downlink is called the DL Secondary CC (DL SCC), and the carrier corresponding to the Scell ​​in the uplink is called the UL Secondary CC (UL SCC).

[0063] In a UE where CA is configured and DC is not configured, a Pcell PUCCH group (also referred to as a primary PUCCH group) consisting of a Pcell and zero or more Scells, and an Scell ​​PUCCH group (also referred to as a secondary PUCCH group) consisting only of Scell(s) may be configured. In the case of an Scell, an Scell ​​(hereinafter referred to as a PUCCH Scell) to which a PUCCH associated with that cell is transmitted may be configured. An Scell ​​designated as a PUCCH Scell ​​belongs to the Scell ​​PUCCH group (i.e., secondary PUCCH group), and the PUCCH transmission of the associated UCI is performed on the said PUCCH Scell; an Scell ​​that is not designated as a PUCCH Scell, or an Scell ​​in which the cell designated as a PUCCH transmission cell is a Pcell, belongs to the Pcell PUCCH group (i.e., primary PUCCH group), and the PUCCH transmission of the associated UCI is performed on the said Pcell. In the following, if the UE is configured with an SCG and some implementations of this specification related to PUCCH apply 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 this specification related to PUCCH apply to a secondary PUCCH group, the primary cell may refer to the PUCCH Scell ​​of the secondary PUCCH group.

[0064] In a wireless communication system, the UE receives information from the BS via the downlink (DL) and transmits information to the BS via the uplink (UL). The information transmitted and / or received by the BS and the UE includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and / or receive.

[0065] 3GPP-based communication standards define downlink physical channels corresponding to resource elements that carry information originating from upper layers, and downlink physical signals corresponding to resource elements used by the physical layer but not carrying information originating from upper layers. For example, the physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), and physical downlink control channel (PDCCH) are defined as downlink physical channels, while the reference signal and synchronization signal are defined as downlink physical signals. The reference signal (RS), also referred to as a pilot, refers to a signal of a specific, predefined waveform known to both the BS and the UE. For example, the demodulation reference signal (DMRS), channel state information RS (CSI-RS), and positioning reference signal (PRS) are defined as downlink reference signals. 3GPP-based communication standards define uplink physical channels corresponding to resource elements that carry information originating from the upper layer, and uplink physical signals corresponding to resource elements that are used by the physical layer but do not carry information originating from the upper layer.For example, the physical uplink shared channel (PUSCH), physical uplink control channel (PCCH), and physical random access channel (PRACH) are defined as uplink physical channels, and the demodulation reference signal (DMRS) for uplink control / data signals and the sounding reference signal (SRS) used for uplink channel measurement are defined.

[0066] In this specification, PDCCH (Physical Downlink Control Channel) refers to a set of time-frequency resources (e.g., resource elements (REs)) carrying DCI (Downlink Control Information), and PDSCH (Physical Downlink Shared Channel) refers to a set of time-frequency resources carrying downlink data. Additionally, PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), and PRACH (Physical Random Access Channel) respectively refer to sets of time-frequency resources carrying UCI (Uplink Control Information), uplink data, and random access signals. In the following, the expression that a user device transmits / receives PUCCH / PUSCH / PRACH is used to mean that the user device transmits / receives uplink control information / uplink data / random access signals on or through PUCCH / PUSCH / PRACH, respectively. In addition, the expression that BS transmits / receives PBCH / PDCCH / PDSCH is used with the same meaning as transmitting broadcast information / downlink control information / downlink data on or through PBCH / PDCCH / PDSCH, respectively.

[0067] In this specification, radio resources (e.g., time-frequency resources) scheduled or set for a UE by a BS for the transmission or reception of PUCCH / PUSCH / PDSCH are also referred to as PUCCH / PUSCH / PDSCH resources.

[0068] Since the communication device receives a synchronization signal (SS), DMRS, CSI-RS, PRS, PBCH, PDCCH, PDSCH, PUSCH, and / or PUCCH in the form of radio signals on the cell, it is not possible to selectively receive only radio signals containing only a specific physical channel or a specific physical signal through the RF receiver, or to selectively receive only radio signals excluding only a specific physical channel or a specific physical signal through the RF receiver. In actual operation, the communication device first receives radio signals on the cell through the RF receiver, converts the radio signals, which are RF band signals, into baseband signals, and uses one or more processors to decode the physical signals and / or physical channels within the baseband signals. Accordingly, in some implementations of this specification, not receiving a physical signal and / or physical channel may actually mean that the communication device does not receive wireless signals containing the physical signal and / or physical channel at all, but rather does not attempt to recover the physical signal and / or physical channel from the wireless signals, for example, not attempt to decode the physical signal and / or physical channel.

[0069] As more communication devices require larger communication capacities, the need for improved mobile broadband communication compared to existing radio access technology (RAT) is emerging. Furthermore, Massive Mobile Telecommunications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the key issues to be considered in next-generation communication. In addition, communication system designs that consider reliability and latency-sensitive services / UEs are being discussed. Accordingly, the introduction of next-generation RATs that incorporate advanced mobile broadband communication, Massive MTC, and Ultra-Reliable and Low Latency Communication (URLC) is being discussed. Currently, 3GPP is conducting studies on next-generation mobile communication systems following the EPC. For convenience, this specification refers to the technology as New RAT (NR) or 5G RAT, and systems that use or support NR are referred to as NR systems.

[0070] FIG. 1 illustrates an example of a communication system 1 to which the implementations of the present specification apply. Referring to FIG. 1, the communication system (1) to which the present specification applies includes a wireless device, a BS, and a network. Here, a wireless device refers to a device that performs communication using wireless access technology (e.g., 5G NR (New RAT), LTE (e.g., E-UTRA)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, a wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Thing) device (100f), and an AI device / server (400). For example, a vehicle may include a vehicle equipped with wireless communication capabilities, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, etc. Here, vehicles may include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices and may be implemented in the form of HMDs (Head-Mounted Devices), HUDs (Head-Up Displays) equipped in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Portable devices may include smartphones, smartpads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., laptops, etc.). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, BS and networks may be implemented as wireless devices, and specific wireless devices may operate as BS / network nodes to other wireless devices.

[0071] Wireless devices (100a to 100f) can be connected to a network (300) via a BS (200). Artificial Intelligence (AI) technology may be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices (100a to 100f) may communicate with each other via the BS (200) / network (300), but they may also communicate directly (e.g., sidelink communication) without using the BS / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0072] Wireless communication / connection (150a, 150b) may be established between wireless devices (100a~100f) / BS (200) and BS (200) / wireless devices (100a~100f). Here, the wireless communication / connection may be established through uplink / downlink communication (150a) and sidelink communication (150b) (or D2D communication) using various wireless access technologies (e.g., 5G NR). Through the wireless communication / connection (150a, 150b), wireless devices and BS / wireless devices may transmit / receive wireless signals to / from each other. To this end, based on various proposals of the present specification, at least some of the following may be performed: a process for setting various configuration information for transmitting / receiving wireless signals, a process for various signal processing (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and a resource allocation process.

[0073] FIG. 2 is a block diagram illustrating examples of communication devices capable of performing the method according to the present specification. Referring to FIG. 2, a first wireless device (100) and a second wireless device (200) can transmit and / or receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} may correspond to {wireless device (100x), BS (200)} and / or {wireless device (100x), wireless device (100x)} of FIG. 1.

[0074] The first wireless device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memory (104) and / or transceivers (106) and may be configured to implement the functions, procedures and / or methods described / suggested below. For example, the processor (102) may process information within the memory (104) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (106). Additionally, the processor (102) may receive a wireless signal containing a second information / signal through the transceiver (106) and then store information obtained from the signal processing of the second information / signal in the memory (104). Memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, memory (104) may store software code containing instructions for performing some or all of the processes controlled by the processor (102) or for performing the procedures and / or methods described / suggested below. Here, the processor (102) and memory (104) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals through one or more antennas (108). The transceiver (106) may include a transmitter and / or receiver. The transceiver (106) may be interchangeably used with an RF (Radio Frequency) unit. In this specification, a wireless device may mean a communication modem / circuit / chip.

[0075] The second wireless device (200) includes one or more processors (202) and one or more memories (204), and may additionally include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memory (204) and / or transceivers (206) and may be configured to implement the functions, procedures and / or methods described / suggested below. For example, the processor (202) may process information within the memory (204) to generate a third information / signal and then transmit a wireless signal containing the third information / signal through the transceiver (206). Additionally, the processor (202) may receive a wireless signal containing a fourth information / signal through the transceiver (206) and then store information obtained from the signal processing of the fourth information / signal in the memory (204). Memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, memory (204) may store software code containing instructions for performing some or all of the processes controlled by the processor (202) or for performing the procedures and / or methods described / suggested below. Here, the processor (202) and memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals through one or more antennas (208). The transceiver (206) may include a transmitter and / or receiver. The transceiver (206) may be interchangeably used with an RF unit. In this specification, a wireless device may mean a communication modem / circuit / chip.

[0076] The wireless communication technology implemented in the wireless device (100, 200) of this specification may include LTE, NR, and 6G, as well as Narrowband Internet of Things for low-power communication. In this case, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented according to standards such as LTE Cat NB1 and / or LTE Cat NB2, but is not limited to the names mentioned above. Additionally, or generally, the wireless communication technology implemented in the wireless device (XXX, YYY) of this specification may perform communication based on LTE-M technology. In this case, for example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the names mentioned above. Additionally or generally, wireless communication technology implemented in the wireless device (XXX, YYY) of this specification may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) with consideration for low-power communication, and is not limited to the names mentioned above. As an example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and may be referred to by various names.

[0077] Hereinafter, hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 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, 202) may generate one or more protocol data units (PDU) and / or one or more service data units (SDU) according to the functions, procedures, proposals and / or methods disclosed in this specification. One or more processors (102, 202) may generate messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this specification. One or more processors (102, 202) may generate a signal (e.g., baseband signal) containing a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this specification and provide it to one or more transceivers (106, 206). One or more processors (102, 202) may receive a signal (e.g., baseband signal) from one or more transceivers (106, 206) and may obtain a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this specification.

[0078] One or more processors (102, 202) may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For 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, 202). The functions, procedures, proposals, and / or methods disclosed in this specification may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the functions, procedures, proposals and / or methods disclosed in this specification may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) and driven by one or more processors (102, 202). The functions, procedures, proposals and / or methods disclosed in this specification may be implemented using firmware or software in the form of code, instructions and / or sets of instructions.

[0079] One or more memories (104, 204) may be connected to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories (104, 204) may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer read storage media, and / or combinations thereof. One or more memories (104, 204) may be located inside and / or outside of one or more processors (102, 202). Additionally, one or more memories (104, 204) may be connected to one or more processors (102, 202) through various technologies such as wired or wireless connections.

[0080] One or more transceivers (106, 206) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc. of this specification to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, wireless signals / channels, etc., as mentioned in the functions, procedures, proposals, methods and / or operation flowcharts, etc. disclosed in this specification from one or more other devices. For example, one or more transceivers (106, 206) may be connected to one or more processors (102, 202) and may transmit and / or receive wireless signals. For example, one or more processors (102, 202) may control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and / or receive user data, control information, wireless signals / channels, etc., as mentioned in the functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this specification through one or more antennas (108, 208). In this specification, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert the received wireless signal / channel, etc. from an RF band signal to a baseband signal in order to process the received user data, control information, wireless signal / channel, etc. using one or more processors (102, 202).One or more transceivers (106, 206) can convert user data, control information, wireless signals / channels, etc. processed using one or more processors (102, 202) from baseband signals to RF band signals. To this end, one or more transceivers (106, 206) may include (analog) oscillators and / or filters.

[0081] FIG. 3 illustrates another example of a wireless device capable of performing implementation(s) of the present specification. Referring to FIG. 3, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 2 and may be composed of various elements, components, units / parts, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and additional elements (140). The communication unit may include a communication circuit (112) and transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 2. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 2. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and additional elements (140) and controls the general operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on a program / code / command / information stored in the memory unit (130). Additionally, the control unit (120) may transmit information stored in the memory unit (130) to the outside (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from the outside (e.g., another communication device) via a wireless / wired interface through the communication unit (110) in the memory unit (130).

[0082] The additional element (140) may be configured in various ways depending on the type of wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 1, 100a), a vehicle (Fig. 1, 100b-1, 100b-2), an XR device (Fig. 1, 100c), a portable device (Fig. 1, 100d), a home appliance (Fig. 1, 100e), an IoT device (Fig. 1, 100f), a UE for digital broadcasting, a holographic device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device (Fig. 1, 400), a BS (Fig. 1, 200), a network node, etc. Depending on the use—e.g., service—the wireless device may be movable or used in a fixed location.

[0083] In FIG. 3, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least a portion may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 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, 140) may be wirelessly connected via the communication unit (110). Additionally, each element, component, unit / part, and / or module within the wireless device (100, 200) may include one or more additional elements. For example, the control unit (120) may be composed of one or more sets of processors. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, transitory memory, non-transitory memory and / or a combination thereof.

[0084] In this specification, at least one memory (e.g., 104 or 204) may store instructions or programs, and said instructions or programs may, when executed, cause at least one processor operablely connected to said at least one memory to perform operations according to some embodiments or implementations of this specification.

[0085] In this specification, a computer-readable (non-transient) storage medium may store at least one instruction or computer program, and when executed by at least one processor, said at least one instruction or computer program may cause said at least one processor to perform operations according to some embodiments or implementations of this specification.

[0086] In this specification, a processing device or apparatus may include at least one processor and at least one computer memory connectable to said at least one processor. said at least one computer memory may store instructions or programs, and said instructions or programs, when executed, may cause at least one processor operablely connected to said at least one memory to perform operations according to some embodiments or implementations of this specification.

[0087] In this specification, a computer program may include program code stored on at least one computer-readable (non-transient) storage medium and, when executed, perform operations according to some implementations of this specification or cause at least one processor to perform operations according to some implementations of this specification. 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-transient) storage medium.

[0088] A communication device of this specification comprises at least one processor; and at least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations according to the examples(s) of this specification described below.

[0089] Figure 4 illustrates an example of a frame structure available in a 3GPP-based wireless communication system.

[0090] The structure of the frame in Fig. 4 is merely an example, and the number of subframes, slots, and symbols in the frame can be varied. In an NR system, OFDM numerology (e.g., subcarrier spacing (SCS)) may be configured differently among multiple cells aggregated to a single UE. Accordingly, the (absolute time) duration of a time resource (e.g., subframe, slot, or transmission time interval (TTI)) consisting of the same number of symbols may be configured differently among the aggregated cells. Here, symbols may include OFDM symbols (or cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) symbols) and SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols). In this specification, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols, and DFT-s-OFDM Symbols can be substituted for each other.

[0091] Referring to Fig. 4, uplink and downlink transmissions in an NR system are organized into frames. Each frame is T f = (△f max *N f / 100)*T c = It has a duration of 10 ms and is divided into two half-frames, each with a duration of 5 ms. Here, T is the basic time unit for NR. c = 1 / (△fmax *N f ) and, △f max = 480*10 3 It is Hz, and N f = 4096. For reference, T is the standard time unit for LTE. s = 1 / (△f ref *N f,ref ) and, △f ref = 15*10 3 It is Hz, and N f,ref =2048. T s Wow T c is a constant κ = T s / T c It has a relationship of = 64. Each half-frame consists of 5 subframes, and the period T of a single subframe. sf is 1ms. Subframes are further divided into slots, and the number of slots within a subframe depends on the subcarrier spacing. Each slot consists of 14 or 12 OFDM symbols based on a cyclic prefix. For a normal cyclic prefix (CP), each slot consists of 14 OFDM symbols, while for an extended CP, each slot consists of 12 OFDM symbols. The above numerology is an exponentially scalable subcarrier spacing △f = 2 u It depends on 15 kHz. The following table shows the subcarrier spacing △f = 2 for normalized CP. u *Number of OFDM symbols per slot according to 15 kHz (N slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot It represents ).

[0092]

[0093] The following table shows the subcarrier spacing △f = 2 for extended CP. uThis shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe according to *15 kHz.

[0094]

[0095] For a subcarrier interval setting u, the slots are arranged in increasing order n within the subframe. u s ∈ {0, ..., nsubframe,u slot - 1} and n in increasing order within the frame u s,f ∈ {0, ..., n frame,u slot - 1} is numbered.

[0096] FIG. 5 illustrates a resource grid of a slot. A slot contains multiple (e.g., 14 or 12) symbols in the time domain. For each numerator (e.g., subcarrier interval) and carrier, a common resource block (CRB) N indicated by upper-layer signaling (e.g., radio resource control (RRC) signaling) start,u grid Starting from,N size,u grid,x *N RB sc individual subcarriers and N subframe,u symb A resource grid of N OFDM symbols is defined. Here, N size,u grid,x is the number of resource blocks (RB) in the resource grid, and the subscript x is DL for downlinks and UL for uplinks. RB sc is the number of subcarriers per RB, and in 3GPP-based wireless communication systems, N RB scis typically 12. There is one resource grid for a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL). Carrier bandwidth N for subcarrier spacing configuration u. size,u grid This is given to the UE by upper-layer parameters (e.g., RRC parameters) from the network. Each element within the resource grid for antenna port p and subcarrier spacing u is referred to as a resource element (RE), and one complex symbol can be mapped to each resource element. Each resource element within the resource grid is uniquely identified by an index k in the frequency domain and an index l indicating the symbol position relative to a reference point in the time domain. In an NR system, RBs are defined by 12 consecutive subcarriers in the frequency domain. In an NR system, RBs can be classified into Common Resource Blocks (CRBs) and Physical Resource Blocks (PRBs). CRBs are numbered upwards from 0 in the frequency domain for subcarrier spacing u. The center of subcarrier 0 of CRB 0 for subcarrier spacing u coincides with 'Point A', which is the common reference point for the resource block grids. The PRBs for the subcarrier spacing setting u are defined within the bandwidth part (BWP), and range from 0 to N size,u BWP,i Numbered up to -1, where i is the number of the above bandwidth part. Common resource block n u CRB and physical resource block n within bandwidth part i PRB The relationships between them are as follows: n u PRB = n u CRB +N start,u BWP,i , here N start,u BWP,iis a common resource block where the above bandwidth part starts relative to CRB 0. A BWP contains multiple consecutive RBs in the frequency domain. For example, a BWP is a given numerator u within a BWP i on a given carrier. i It is a subset of contiguous CRBs defined for. The carrier may contain up to N (e.g., 5) BWPs. A UE may be configured to have one or more BWPs on a given component carrier. Data communication is performed through the enabled BWPs, and only a predetermined number (e.g., 1) of the BWPs configured for the UE may be enabled on the carrier.

[0097] For each serving cell within a set of DL BWPs or UL BWPs, the network establishes at least an initial DL BWP and one initial UL BWP (if the serving cell is configured with an uplink) or two initial UL BWPs (if using a supplementary uplink). The network may also establish additional ULs and DL BWPs for the serving cell. For each DL BWP or UL BWP, the UE is provided with the following parameters for the serving cell: i) subcarrier spacing, ii) circular prefix, iii) N start BWP Assuming = 275, offset RB set and length L RB CRBN provided by the RRC parameter locationAndBandwidth, which indicates as the resource indicator value (RIV). start BWP =O carrier +RB start and the number of contiguous RBs N size BWP =L RB , and O provided by the RRC parameter offsetToCarrier for the subcarrier spacing carrier; Index within the set of the above DL BWPs or UL BWPs; set of BWP-common parameters and set of BWP-exclusive parameters.

[0098] Switching between configured BWPs may occur using RRC signaling, DCI, an inactivity timer, or upon the initiation of a random connection. If an inactivity timer is configured for a serving cell, the expiration of the inactivity timer associated with said serving cell switches the active BWP to the default BWP configured by the network.

[0099] Virtual resource blocks (VRBs) are defined within the bandwidth part and range from 0 to N size,u BWP,i Numbered up to -1, where i is the number of the above bandwidth part. VRBs are mapped to physical resource blocks (PRBs) according to interleaved or non-interleaved mapping. In some implementations, for non-interleaved VRB-to-PRB mapping, VRB n can be mapped to PRB n.

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

[0101]

[0102] Figure 6 illustrates physical channels used in a 3GPP-based communication system, which is an example of a wireless communication system, and the signal transmission / reception process using them.

[0103] A UE that has been turned on again after being turned off or has lost connection with a wireless communication system first performs an initial cell search process, such as searching for a suitable cell to camp on and synchronizing with said cell or the BS of said cell (S11). During the initial cell search process, the UE receives a synchronization signal block (SSB) (also called an SSB / PBCH block) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). Based on the PSS / SSS, the UE synchronizes with the BS and obtains information such as the cell identifier (ID). Additionally, the UE can obtain broadcast information within the cell based on the PBCH. Meanwhile, during the initial cell search process, the UE can receive a downlink reference signal (DL RS) to check the downlink channel status.

[0104] After completing the initial cell search, the UE can camp on the cell. After camping on the cell, the UE monitors the PDCCH on the cell and receives the PDSCH according to the downlink control information (DCI) carried by the PDCCH to obtain more specific system information (S12).

[0105] Subsequently, the UE may perform a random access procedure to complete access to the BS (S13 to S16). For example, during the random access procedure, the UE may transmit a preamble through a physical random access channel (PRACH) (S13) and receive a random access response (RAR) for the preamble through a PDCCH and a corresponding PDSCH (S14). If the reception of the RAR for the UE fails, the UE may attempt to re-transmit the preamble. In the case of contention-based random access, a contention resolution procedure (S16) may be performed, which includes transmitting a PUSCH based on the UL resource allocation included in the RAR (S15) and receiving a PDCCH and a corresponding PDSCH.

[0106] A UE that has performed the procedure described above may subsequently perform the reception of PDCCH / PDSCH (S17) and the transmission of PUSCH / PUCCH (S18) as part of a general uplink / downlink signal transmission process. The control information transmitted by the UE to the BS is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK) (also called HARQ-ACK), scheduling request (SR), channel state information (CSI), etc. CSI may include channel quality indicator (CQI), precoding matrix indicator (PMI), and / or rank indicator, etc. UCI is generally transmitted via PUCCH, but may be transmitted via PUSCH if control information and traffic data need to be transmitted simultaneously. In addition, the UE can transmit UCI atypically via PUSCH based on network requests / instructions.

[0107] Figure 7 illustrates SS / PBCH blocks (SSB) on a cell.

[0108] In 3GPP-based systems, each SSB is associated with each beam. For example, during a half-frame, different SSBs may be transmitted in different spatial directions (using different beams that span the cell's coverage area). The possible time positions of SSBs within a half-frame are determined by the subcarriers, and the periododicity of the half-frames in which the SSBs are transmitted is set by the network. Multiple SSBs may be transmitted within the carrier frequency span. Different indices of SSBs transmitted / detected on a single cell may correspond to different BS (wide) Tx beams. Multiple SSBs may be transmitted within the carrier frequency span. The physical (layer) cell identifiers (PCIs) of SSBs transmitted at different frequency locations do not need to be unique, and different SSBs in the frequency domain may have different PCIs. If the SSB is associated with remaining minimum system information (RMSI), the SSB is referred to as a cell-defining SSB (CD-SSB), and the PCell is always associated with the CD-SSB located on the synchronization raster (sync raster). If the SSB is not associated with the RMSI, the SSB is referred to as a non-cell defining SSB (NCD-SSB), which can be used to perform RLM, BFD, and RRM measurements, and measurements for random access resource selection within the active DL BWP if the active DL BWP does not include the CD-SSB.In 3GPP-based systems, multi-beam operation is based on beam switching / beam scanning, which transmits / receives signals while changing the beam direction over time. Beam sweeping refers to the transmission and reception point (TRP) (e.g., BS / cell) changing the beam (direction) of the radio signal over time. In this specification, beam and beam direction may be used interchangeably. SSBs may be transmitted periodically using beam sweeping. In this case, the SSB index is implicitly linked to the SSB beam. The SSB beam may change on an SSB (index) basis or on an SSB (index) group basis. In the latter case, the SSB beam remains the same within the SSB (index) group. For example, referring to Fig. 7, the transmission beam direction of an SSB may be repeated across multiple consecutive SSBs. A set of SSBs is transmitted within a 5 ms half-frame. The set transmitted within a 5 ms half-frame of SSB transmission is called an SSB burst set. The maximum number of SSB transmissions L within an SSB burst set. max has a value of 4, 8, or 64 depending on the frequency band to which the carrier belongs. For example, L is the maximum number of SSBs in an SSB burst set. max It can be given as follows.

[0109] - For frequency range up to 3 GHz, L max = 4

[0110] - For frequency range from 3GHz to 6 GHz, L max = 8

[0111] - For frequency range from 6 GHz to 52.6 GHz, L max = 64

[0112] The actual number of transmitted SSBs can be configured, with a maximum number Lmax It can be smaller.

[0113] When multi-beam transmission is not applied, the number of SSB beams is 1.

[0114] Figure 8 is illustrated to explain the bitmaps used to indicate the SSBs actually being transmitted.

[0115] Up to L SSBs can be transmitted within an SSB burst set, and the number / locations of the SSBs actually transmitted may vary depending on the BS / cell. The number / locations of the SSBs actually transmitted are used for rate-matching and measurement, and information regarding the SSBs actually transmitted (e.g., RRC setting ssb-PositionsInBurst) may be indicated as follows.

[0116] - In the case of rate-matching: This may be indicated via UE-specific RRC signaling or RMSI. UE-specific RRC signaling includes a full (e.g., length L) bitmap in both the below 6 GHz and above 6 GHz frequency ranges. On the other hand, the remaining minimum system information (RMSI) (e.g., SIB1) includes a full bitmap below 6 GHz and a compressed bitmap above 6 GHz as illustrated. Specifically, information regarding the SSB actually transmitted may be indicated using a group bitmap (8-bit) and an in-group bitmap (8-bit). Here, the resources indicated via UE-specific RRC signaling or RMSI (e.g., resource elements (REs)) are reserved for SSB transmission, and PDSCH / PUSCH, etc., may be rate-matched considering the SSB resources.

[0117] - In relation to measurement: When in RRC_CONNECTED mode, the network (e.g., BS) can specify the set of SSBs to be measured within the measurement interval. The set of SSBs can be specified by frequency layer. If no specification is given for the set of SSBs, the default set of SSBs is used. The default set of SSBs includes all SSBs within the measurement interval. The set of SSBs can be specified using a full (e.g., length L) bitmap of the RRC signaling. When in RRC_IDLE mode, the default set of SSBs is used.

[0118] Figure 9 illustrates the system information (SI) acquisition process. A UE can acquire AS- / NAS- information through the SI acquisition process. The SI acquisition process can be applied to UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states. RRC_CONNECTED is a state in which the UE has established an RRC connection with the network. RRC_IDLE is a state in which the UE is not registered with a specific cell and has not received the access stratum (AS) context and other information received from the network. RRC_INACTIVE is a state in which the UE remains in CM-CONNECTED, a state in which it has a signaling connection with the core network for connection management (CM), and can move within an area set by the RAN (e.g., BS(s)) without notifying the radio access network (RAN). CM_CONNECTED is a state in which the UE has a non-access stratum (NAS) signaling connection with the core network, and CM_IDLE is a state in which the UE has no NAS signaling.

[0119] In 3GPP-based systems, SI can be divided into a master information block (MIB) and multiple system information blocks (SIBs). The MIB and multiple SIBs can be further divided into minimum SI and other SI. Here, the minimum SI may consist of an MIB and SystemInformationBlock1 (SIB1), and includes basic information required for initial connection and information for obtaining other SI. Here, SIB1 may be referred to as remaining minimum system information (RMSI). For details, refer to the following.

[0120] - The MIB is always transmitted over a BCH with a periododicity of 80 ms and repetitions created within 80 ms. The MIB contains information / parameters related to the reception of SIB1 and is transmitted via the SSB's PBCH. During initial cell selection, the UE assumes that half-frames containing the SSB(s) repeat at a period of 20 ms. Based on the MIB, the UE can check whether a control resource set (CORESET) exists for the Type0-PDCCH common search space. The Type0-PDCCH common search space is a type of PDCCH search space and is used to transmit the PDCCH that schedules SI messages. If a Type0-PDCCH common seek space exists, the UE can determine (i) multiple consecutive RBs and one or more consecutive symbols that constitute a CORESET and (ii) the PDCCH time (i.e., the time domain location for receiving the PDCCH) based on information within the MIB (e.g., pdcch-ConfigSIB1). If a Type0-PDCCH common seek space does not exist, pdcch-ConfigSIB1 provides information regarding frequency locations where SSB / SIB1 exists and frequency ranges where SSB / SIB1 does not exist.

[0121] - SIB1 is transmitted over a downlink shared channel (DL-SCH) with a periododicity of 160 ms and a variable transmission repetition period within 160 ms. The default transmission repetition period of SIB1 is 20 ms, but the actual transmission repetition period may vary depending on the network implementation. SIB1 contains information regarding the availability and scheduling (e.g., transmission period, SI-window size) of the remaining SIBs (hereinafter SIBx, where x is an integer greater than or equal to 2). For example, SIB1 can indicate whether SIBx is broadcast periodically or provided on-demand by a UE's request. If SIBx is provided on-demand, SIB1 may contain information necessary for the UE to perform an SI request. SIB1 is a cell-specific SIB. The PDCCH scheduling SIB1 is transmitted through the Type0-PDCCH common seek space, and SIB1 is transmitted through the PDSCH directed by the said PDCCH.

[0122] - SIBx is included in SI messages and transmitted via PDSCH. Each SI message is transmitted within a time window (i.e., SI window) that occurs periodically according to SI-scheduling information provided by SIB1.

[0123] Changes to SI (not for earthquake and tsunami warning systems (ETWS) and commercial mobile alert services (CMAS)) occur only within a specific number of radio frames. These specific number of radio frames are called the SI modification period. The SI may be transmitted multiple times with the same content within the SI modification period. The boundaries of the SI modification period are defined by SFN values ​​satisfying the following: SFN mod m = 0, where m is the number of radio frames containing the SI modification period. The SI modification period may be set by SIB1. When the network changes the SI, the network may notify the UEs of this change through the SI modification period and then transmit the updated SI in the next SI modification period.

[0124] FIG. 10 illustrates a random connection process that can be applied to the implementation(s) of the present specification. In particular, FIG. 10(a) illustrates a four-step random connection process, and FIG. 10(b) illustrates a two-step random connection process.

[0125] The random access process can be used for various purposes, such as initial access, uplink adjustment, resource allocation, handover, reconfiguration after a wireless link failure, and location measurement. Random access processes are classified into contention-based and dedicated (i.e., non-contention-based) processes. Contention-based random access processes are generally used for initial access, while dedicated random access processes are used for handover, when downlink data reaches the network, and when reconfiguring uplink synchronization for location measurement. In a contention-based random access process, the UE randomly selects a random access (RA) preamble. Therefore, it is possible for multiple UEs to transmit the same RA preamble simultaneously, which necessitates a subsequent contention resolution process. In contrast, in a dedicated random access process, the UE uses an RA preamble uniquely assigned to it by the BS. Consequently, the UE can perform the random access process without conflicts with other UEs.

[0126] Referring to FIG. 10(a), the contention-based random access process includes the following four steps. Hereinafter, the messages transmitted in steps 1 through 4 may be referred to as Msg1 through Msg4, respectively.

[0127] - Step 1: The UE transmits the RA preamble via PRACH.

[0128] - Step 2: The UE receives a random access response (RAR) from the BS via PDSCH.

[0129] - Step 3: The UE transmits UL data to the BS via PUSCH based on RAR. Here, the UL data includes Layer 2 and / or Layer 3 messages.

[0130] - Step 4: The UE receives a contention resolution message from the BS via PDSCH.

[0131] The UE may receive information regarding random access from the BS through system information. For example, information regarding RACH occasions associated with SSBs on the cell may be provided through system information. In this specification, a RACH occasion is also referred to as a PRACH occasion and may mean a time-frequency resource for transmitting a random access preamble for Msg1. The UE may select an SSB among those received on the cell for which the reference signal received power (RSRP) measured based on the SSB exceeds a threshold, and transmit a RA preamble through the PRACH associated with the selected SSB. For example, if random access is required, the UE transmits Msg1 (e.g., preamble) to the BS over the PRACH. The BS can distinguish each random access preamble through the time / frequency resource (RA Occasion, RO) where the random access preamble was transmitted and the random access preamble index (Preamble Index, PI). When the BS receives a random access preamble from the UE, the BS transmits a RAR message to the UE over the PDSCH. To receive the RAR message, the UE monitors a L1 / L2 control channel (PDCCH) masked with a cyclic redundancy check (CRC) containing scheduling information for the RAR message via RA-RNTI (Random Access-RNTI) within a preset time window (e.g., ra-ResponseWindow). If scheduling information is received via the PDCCH masked with RA-RNTI, the UE can receive the RAR message from the PDSCH indicated by the scheduling information. Subsequently, the UE determines whether there is a RAR for itself among the RAR messages.Whether a RAR exists for itself can be determined by checking whether a RAPID (Random Access preamble ID) exists for the preamble sent by the UE. The index of the preamble sent by the UE and the RAPID can be the same. A RAR includes a corresponding random access preamble index, timing offset information for UL synchronization (e.g., a timing advance command (TAC)), UL scheduling information for sending Msg3 (e.g., a UL grant), and temporary UE identification information (e.g., Temporary-C-RNTI, TC-RNTI). Upon receiving the RAR, the UE sends Msg3 via PUSCH according to the UL scheduling information and timing offset values ​​within the RAR. Msg3 may include the UE's ID (or the UE's global ID). Additionally, Msg3 may include information related to an RRC connection request for initial access to the network (e.g., an RRCSetupRequest message). After receiving Msg3, the BS sends Msg4, a contention resolution message, to the UE. If the UE receives the contention resolution message and the contention is successfully resolved, TC-RNTI is changed to C-RNTI. Msg4 includes the UE's ID and / or It may include information related to the RRC connection (e.g., RRCSetup message). If the information transmitted via Msg3 does not match the information received via Msg4, or if Msg4 is not received for a certain period of time, the UE may report that the contention resolution failed and retransmit Msg3.

[0132] Meanwhile, the dedicated random access process includes the following three steps. Hereinafter, the messages transmitted in steps 0 to 2 may be referred to as Msg0 to Msg2, respectively. The dedicated random access process may be triggered by the UE by the BS using a PDCCH (hereinafter referred to as the PDCCH order) intended to command the transmission of an RA preamble.

[0133] - Step 0: BS assigns the RA preamble to the UE via dedicated signaling.

[0134] - Step 1: The UE transmits the RA preamble via PRACH.

[0135] - Step 2: The UE receives the RAR via the PDSCH from the BS.

[0136] The operations of steps 1 to 2 of a dedicated random access process may be the same as steps 1 to 2 of a contention-based random access process.

[0137] In NR systems, lower latency than in existing systems may be required. Additionally, a four-stage random access process may not be desirable, particularly for latency-sensitive services such as URLLC. A low-latency random access process may be required within various scenarios of NR systems. When the implementation(s) of this specification are performed with a random access process, to reduce latency in the random access process, the implementation(s) of this specification may be performed with the following two-stage random access process.

[0138] Referring to FIG. 10(b), the two-stage random access process may consist of two stages: the transmission of MsgA from the UE to the BS and the transmission of MsgB from the BS to the UE. The transmission of MsgA may include the transmission of an RA preamble via PRACH and the transmission of a UL payload via PUSCH. In the transmission of MsgA, PRACH and PUSCH may be transmitted using time division multiplexing (TDM). Alternatively, in the transmission of MsgA, PRACH and PUSCH may be transmitted using frequency division multiplexing (FDM).

[0139] A BS that receives MsgA may send MsgB to a UE. MsgB may include a RAR for said UE.

[0140] A message related to an RRC connection request (e.g., RRCSetupRequest message) requesting to establish a connection between the RRC layer of the BS and the RRC layer of the UE may be transmitted by being included in the payload of MsgA. In this case, MsgB may be used to transmit RRC connection-related information (e.g., RRCSetup message). Alternatively, the RRC connection request message (e.g., RRCSetupRequest message) may be transmitted via PUSCH transmitted based on a UL grant within MsgB. In this case, the RRC connection-related information (e.g., RRCSetup message) related to the RRC connection request may be transmitted via PDSCH associated with said PUSCH transmission after the PUSCH transmission based on MsgB.

[0141] Below, physical channels that can be used in 3GPP-based wireless communication systems are described in more detail.

[0142] A PDCCH carries a DCI. For example, a PDCCH (i.e., a DCI) carries the transmission format and resource allocation of the downlink shared channel (DL-SCH), resource allocation information for the uplink shared channel (UL-SCH), paging information for the paging channel (PCH), system information on the DL-SCH, resource allocation information for control messages of the layer above the physical layer (hereinafter referred to as the upper layer) among the protocol stacks of the UE / BS, such as random access response (RAR) transmitted on the PDSCH, transmission power control commands, and the activation / deactivation of configured scheduling (CS). A DCI containing resource allocation information for the DL-SCH is also called a PDSCH scheduling DCI, and a DCI containing resource allocation information for the UL-SCH is also called a PUSCH scheduling DCI. The DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled with various identifiers (e.g., radio network temporary identifier (RNTI)) depending on the owner or use of the PDCCH. For example, if the PDCCH is for a specific UE, the CRC is masked with the UE identifier (e.g., cell RNTI (C-RNTI)). If the PDCCH is for paging, the CRC is masked with the paging RNTI (P-RNTI). If the PDCCH is for system information (e.g., system information block (SIB)), the CRC is masked with the system information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the random access RNTI (RA-RATI).

[0143] The scheduling of a PDCCH on one serving cell to a PDSCH or PUSCH on another serving cell is called cross-carrier scheduling. Cross-carrier scheduling using a carrier indicator field (CIF) may allow a PDCCH on a serving cell to schedule resources on another serving cell. Meanwhile, the scheduling of a PDSCH or PUSCH on a serving cell to a serving cell is called self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide the UE with information regarding the cell scheduling said cell. For example, the BS may provide the UE with whether the serving cell is scheduled by a PDCCH on another (scheduling) cell or by said serving cell, and if said serving cell is scheduled by another (scheduling) cell, which cell signals downlink assignments and uplink grants for said serving cell. In this specification, a cell carrying a PDCCH is referred to as a scheduling cell, and a cell in which the transmission of a PUSCH or PDSCH is scheduled by a DCI included in the PDCCH, that is, a cell carrying a PUSCH or PDSCH scheduled by the PDCCH, is referred to as a scheduled cell.

[0144] PDSCH is a physical layer DL channel for DL ​​data transport. PDSCH carries downlink data (e.g., DL-SCH transport blocks) and applies modulation methods such as QPSK (Quadrature Phase Shift Keying), 16 QAM (Quadrature Amplitude Modulation), 64 QAM, and 256 QAM. Codewords are generated by encoding transport blocks (TB). PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and the modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to a radio resource along with DMRS to generate an OFDM symbol signal, which is then transmitted through the corresponding antenna port.

[0145] The UE must have uplink resources available to it for UL-SCH data transmission and downlink resources available to it for DL-SCH data reception. Uplink resources and downlink resources are assigned to the UE through resource allocation by the BS. Resource allocation may include time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA). In this specification, uplink resource allocation is also referred to as uplink grant, and downlink resource allocation is also referred to as downlink assignment. Uplink grant is dynamically received by the UE on the PDCCH or within the RAR, or is semi-persistently set to the UE by RRC signaling from the BS. Downlink assignment is dynamically received by the UE on the PDCCH, or is semi-persistently set to the UE by RRC signaling from the BS.

[0146] In UL, the BS can dynamically allocate uplink resources to the UE via PDCCH(s) addressed to a cell radio network temporary Identifier (C-RNTI). The UE monitors the PDCCH(s) to find available uplink grant(s) for UL transmission. Additionally, the BS can allocate uplink resources to the UE using configured grants. Two types of configured grants, Type 1 and Type 2, may be used. In the case of Type 1, the BS directly provides the configured uplink grant (including periodicity) via RRC signaling. In the case of Type 2, the BS sets the period of the RRC-configured uplink grant via RRC signaling and can signal and activate or deactivate the configured uplink grant via a PDCCH addressed to a configured scheduling RNTI (CS-RNTI). For example, in the case of Type 2, the PDCCH addressed by CS-RNTI indicates that the corresponding uplink grant may be implicitly reused according to the period set by RRC signaling until it is deactivated.

[0147] In DL, the BS can dynamically allocate downlink resources to the UE via PDCCH(s) addressed by C-RNTI. The UE monitors the PDCCH(s) to identify potential downlink assignments. Additionally, the BS can allocate downlink resources to the UE using semi-persistent scheduling (SPS). The BS can set the period of the configured downlink assignments via RRC signaling and signal and enable or disable the configured downlink assignments via PDCCHs addressed by CS-RNTI. For example, a PDCCH addressed by CS-RNTI indicates that the corresponding downlink assignment may be implicitly reused according to the period set by RRC signaling until it is disabled.

[0148] In this specification, a PDSCH based on DL SPS is referred to as SPS PDSCH, a PUSCH based on UL CG is referred to as CG PUSCH, a PDSCH dynamically scheduled by a DCI carried by a PDCCH is referred to as DG PDSCH, and a PUSCH dynamically scheduled by a DCI carried by a PDCCH is referred to as DG PUSCH.

[0149] Figure 11 illustrates an example of PDSCH time domain resource allocation by PDCCH and an example of PUSCH time domain resource allocation by PDCCH.

[0150] The DCI carried by PDCCH to schedule PDSCH or PUSCH includes a time domain resource assignment (TDRA) field, said TDRA field provides a value m for row index m+1 to the allocation table for PDSCH or PUSCH. A predefined default PDSCH time domain assignment is applied as the allocation table for PDSCH, or a PDSCH time domain resource assignment table set by BS via RRC signaling pdsch-TimeDomainAllocationList is applied as the allocation table for PDSCH. A predefined default PUSCH time domain assignment is applied as the allocation table for PUSCH, or a PUSCH time domain resource assignment table set by BS via RRC signaling pdsch-TimeDomainAllocationList is applied as the allocation table for PUSCH. The PDSCH time domain resource allocation table to be applied and / or the PUSCH time domain resource allocation table to be applied may be determined according to fixed / predefined rules (e.g., see 3GPP TS 38.214).

[0151] In the PDSCH time domain resource settings, each indexed row defines the DL allocation-to-PDSCH slot offset K0, the start and length indicator value SLIV (or directly the starting position of the PDSCH within the slot (e.g., start symbol index S) and the allocation length (e.g., number of symbols L)), and the PDSCH mapping type. In the PUSCH time domain resource settings, each indexed row defines the UL grant-to-PUSCH slot offset K2, the starting position of the PUSCH within the slot (e.g., start symbol index S) and the allocation length (e.g., number of symbols L), and the PUSCH mapping type. K0 for PDSCH or K2 for PUSCH indicates the difference between the slot containing the PDSCH and the slot containing the PDSCH or PUSCH corresponding to said PDSCH. SLIV is a joint indicator of the starting symbol S relative to the start of the slot containing the PDSCH or PUSCH and the number of consecutive symbols L counted from said symbol S. For PDSCH / PUSCH mapping types, there are two mapping types: one is mapping type A and the other is mapping type B. In the case of PDSCH / PUSCH mapping type A, the demodulation reference signal (DMRS) is mapped to the PDSCH / PUSCH resource based on the start of the slot, and depending on other DMRS parameters, one or two symbols from the PDSCH / PUSCH resource may be used as DMRS symbol(s). For example, in the case of PDSCH / PUSCH mapping type A, the DMRS is located at the third symbol (symbol #2) or the fourth symbol (symbol #3) in the slot according to RRC signaling. In the case of PDSCH / PUSCH mapping type B, the DMRS is mapped based on the first OFDM symbol of the PDSCH / PUSCH resource, and depending on other DMRS parameters, one or two symbols starting from the first symbol of the PDSCH / PUSCH resource may be used as DMRS symbol(s).For example, in the case of PDSCH / PUSCH mapping type B, DMRS is located at the first symbol allocated for PDSCH / PUSCH. In this specification, PDSCH / PUSCH mapping types may be referred to as mapping types or DMRS mapping types. For example, in this 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.

[0152] The above scheduling DCI includes a frequency domain resource assignment (FDRA) field that provides assignment information regarding resource blocks used for PDSCH or PUSCH. For example, the FDRA field provides the UE with information regarding a cell for PDSCH or PUSCH transmission, information regarding a BWP for PDSCH or PUSCH transmission, and information regarding resource blocks for PDSCH or PUSCH transmission.

[0153] A control resource set (CORESET), which is a set of time-frequency resources that allows the UE to monitor a PDCCH, may be defined and / or configured. The CORESET consists of a set of physical resource blocks (PRBs) with a duration of one to three OFDM symbols. The PRBs constituting the CORESET and the CORESET duration may be provided to the UE via upper-layer (e.g., RRC) signaling. Within the configured CORESET(s), a set of PDCCH candidates is monitored according to the corresponding search space sets. In this specification, monitoring implies decoding (also known as blind decoding) each PDCCH candidate according to the monitored DCI formats. The master information block (MIB) on the PBCH provides the UE with parameters for monitoring the PDCCH (e.g., CORESET#0 configuration) to schedule the PDCCH carrying the system information block (SIB1). The PBCH may also indicate that there is no associated SIB1; in this case, the UE may be instructed on a frequency range where it can assume there is no SSB associated with SSB1, as well as other frequencies to search for the SSB associated with SIB1. At least CORESET#0, which is the CORESET for scheduling SIB1, can be set via MIB or dedicated RRC signaling.

[0154] One or more CORESETs can be configured for the UE, and multiple CORESETs can overlap in the time / frequency domain.

[0155] The set of PDCCH candidates monitored by the UE is defined in terms of PDCCH search space sets. A search space set can be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET setting is associated with one or more search space sets, and each search space set is associated with one CORESET setting.

[0156] A set of PDCCH candidates can be monitored on one or more CORESETs on active DL BWPs on each active serving cell where PDCCH monitoring is configured, wherein monitoring implies receiving each PDCCH candidate and decoding it according to the monitored DCI formats. For example, the following DCI formats may exist.

[0157]

[0158] SS sets can be configured via system information (e.g., MIB) or UE-specific upper layer (e.g., RRC) signaling. Each DL BWP in a serving cell may have up to S (e.g., 10) SS sets configured. For example, the following parameters / information may be provided for each SS set. Each SS set is associated with one CORESET, and each CORESET configuration may be associated with one or more SS sets.

[0159] - searchSpaceId: Represents the ID of the SS set.

[0160] - controlResourceSetId: Represents the CORESET associated with the SS set.

[0161] - monitoringSlotPeriodicityAndOffset: Represents the PDCCH monitoring period interval (in slots) and the PDCCH monitoring interval offset (in slots).

[0162] - monitoringSymbolsWithinSlot: Represents the first OFDMA symbol(s) for PDCCH monitoring within the slot where PDCCH monitoring is configured. It is indicated by a bitmap, where each bit corresponds to each OFDMA symbol within the slot. The MSB of the bitmap corresponds to the first OFDMA symbol within the slot. The OFDMA symbol(s) corresponding to bit(s) with a bit value of 1 correspond to the first symbol(s) of the CORESET within the slot.

[0163] - nrofCandidates: AL={1, 2, 4, 8, 16} represents the number of star PDCCH candidates (e.g., one of 0, 1, 2, 3, 4, 5, 6, 8).

[0164] - searchSpaceType: Indicates whether the SS type is CSS or USS.

[0165] - DCI Format: Indicates the DCI format of the PDCCH candidate.

[0166] Based on the CORESET / SS set configuration, the UE can monitor PDCCH candidates from one or more SS sets within the slot. The occasion (e.g., time / frequency resources) when PDCCH candidates must be monitored is defined as a PDCCH (monitoring) time. One or more PDCCH (monitoring) times can be configured within the slot.

[0167] PUCCH refers to a physical layer UL channel for UCI transmission. PUCCH carries Uplink Control Information (UCI). The UCI types transmitted in PUCCH include hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information, scheduling request (SR), and channel state information (CSI). The UCI bits include HARQ-ACK information bits, SR information bits, LRR information bits, and CSI bits, if present. In this specification, the HARQ-ACK information bits correspond to the HARQ-ACK codebook. In particular, a bit sequence in which HARQ-ACK information bits are arranged according to a defined rule is referred to as the HARQ-ACK codebook.

[0168] - Scheduling request (SR): Information used to request UL-SCH resources.

[0169] - Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK): This is a response to a downlink data packet (e.g., codeword) on the PDSCH. It indicates whether the downlink data packet has been successfully received by the communication device. A 1-bit HARQ-ACK is transmitted in response to a single codeword, and a 2-bit HARQ-ACK may be transmitted in response to two codewords. HARQ-ACK responses include a positive ACK (simply ACK), a negative ACK (NACK), a DTX, or a NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ ACK / NACK, ACK / NACK, or A / N.

[0170] - Channel state information (CSI): Feedback information for downlink channels. CSI may include channel quality information (CQI), rank indicator (RI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SS / PBCH resource block indicator (SSBRI), layer indicator (LI), etc.

[0171] - Link recovery request (LRR)

[0172] In this specification, for convenience, the PUCCH resources that BS sets and / or directs to the UE for HARQ-ACK, SR, and CSI transmission are respectively referred to as the HARQ-ACK PUCCH resource, SR PUCCH resource, and CSI PUCCH resource.

[0173] PUCCH formats can be classified as follows based on the UCI payload size and / or transmission length (e.g., the number of symbols constituting the PUCCH resource). For details regarding PUCCH formats, refer to Table 5.

[0174] (0) PUCCH format 0 (PF0, F0)

[0175] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0176] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0177] - Transmission structure: PUCCH format 0 consists only of UCI signals without DMRS, and the UE transmits the UCI state by selecting and transmitting one of multiple sequences. For example, the UE transmits a specific UCI to the BS by transmitting one of multiple sequences through a PUCCH that is PUCCH format 0. The UE transmits a PUCCH that is PUCCH format 0 within the PUCCH resource for the corresponding SR setting only when transmitting a positive SR.

[0178] - The configuration for PUCCH format 0 includes the following parameters for the corresponding PUCCH resource: an index for the initial cycle transition, the number of symbols for the PUCCH transmission, and the first symbol for the PUCCH transmission.

[0179] (1) PUCCH format 1 (PF1, F1)

[0180] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0181] - Number of OFDM symbols constituting a single PUCCH: Y ~ Z symbols (e.g., Y = 4, Z = 14)

[0182] - Transmission Structure: DMRS and UCI are configured / mapped in a TDM form to different OFDM symbols. That is, DMRS is transmitted in symbols where modulation symbols are not transmitted. UCI is represented by multiplying a modulation (e.g., QPSK) symbol by a specific sequence (e.g., orthogonal cover code, OCC). Code division multiplexing (CDM) is supported between multiple PUCCH resources (following PUCCH format 1) (within the same RB) by applying cyclic shift (CS) / OCC to both UCI and DMRS. PUCCH format 1 carries a UCI of up to 2 bits, and modulation symbols are spread by an orthogonal cover code (OCC) in the time domain (configured differently depending on whether frequency hopping occurs).

[0183] - The configuration for PUCCH format 1 includes the following parameters for the corresponding PUCCH resource: an index for the initial circular transition, the number of symbols for the PUCCH transmission, the first symbol for the PUCCH transmission, and an index for the orthogonal cover code.

[0184] (2) PUCCH format 2 (PF2, F2)

[0185] - Supported UCI payload size: more than K bits (e.g., K = 2)

[0186] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0187] - Transmission Structure: DMRS and UCI are configured / mapped within the same symbol in the form of Frequency Division Multiplex (FDM). The UE transmits by applying only the IFFT without the DFT to the coded UCI bits. PUCCH Format 2 carries a UCI with a bit size greater than K bits, and the modulated symbol is transmitted via DMRS and FDM. For example, DMRS is located at symbol indices #1, #4, #7, and #10 within a given resource block at a density of 1 / 3. A pseudo-noise (PN) sequence is used for the DMRS sequence. Frequency hopping can be enabled for 2-symbol PUCCH Format 2.

[0188] - The configuration for PUCCH format 2 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols for PUCCH transmission, and the first symbol for said PUCCH transmission.

[0189] (3) PUCCH format 3 (PF3, F3)

[0190] - Supported UCI payload size: more than K bits (e.g., K = 2)

[0191] - Number of OFDM symbols constituting a single PUCCH: Y ~ Z symbols (e.g., Y = 4, Z = 14)

[0192] - Transmission Structure: DMRS and UCI are configured / mapped to different symbols in the form of TDM. The UE transmits by applying the DFT to the coded UCI bits. PUCCH Format 3 does not support UE multiplexing for the same time-frequency resource (e.g., same PRB).

[0193] - The configuration for PUCCH format 3 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols for PUCCH transmission, and the first symbol for said PUCCH transmission.

[0194] (4) PUCCH format 4 (PF4, F4)

[0195] - Supported UCI payload size: more than K bits (e.g., K = 2)

[0196] - Number of OFDM symbols constituting a single PUCCH: Y ~ Z symbols (e.g., Y = 4, Z = 14)

[0197] - Transmission structure: DMRS and UCI are configured / mapped in the form of TDM to different symbols. PUCCH format 4 can multiplex up to 4 UEs within the same PRB by applying OCC before the DFT and applying CS (or interleaved FDM, IFDM) mapping to DMRS. In other words, the modulated symbols of UCI are transmitted by TDM (Time Division Multiplexing) with DMRS.

[0198] - The configuration for PUCCH format 4 includes the following parameters for the corresponding PUCCH resource: the number of symbols for PUCCH transmission, the length for the orthogonal cover code, the index for the orthogonal cover code, and the first symbol for the PUCCH transmission.

[0199] The following table provides examples of PUCCH formats. Depending on the PUCCH transmission length, they can be classified into short PUCCH (formats 0, 2) and long PUCCH (formats 1, 3, 4).

[0200]

[0201] If the UE does not have a dedicated PUCCH configuration provided by the PUCCH-ResourceSet within the RRC configuration PUCCH-Config, for example, before the UE acquires the PUCCH-Config, the PUCCH resource set is N size BWPFor the transmission of HARQ-ACK information on the PUCCH within the initial UL BWP of the PRBs, it may be provided by the push-ResourceCommon within the SIB through an index to the row of the following table. The following table is Table 9.2.1-1 of 3GPP TS 38.213 and exemplifies the sets of PUCCH resources (also referred to as initial PUCCH resource sets) and their corresponding parameters that may be used prior to the establishment of a dedicated PUCCH resource. The BS specifically sets / instructs one of the index values ​​0 through 15 of the following table through the parameter push-ResourceCommon within the SIB.

[0202]

[0203] Each of the above PUCCH resource sets comprises, for PUCCH transmission, a PUCCH format, a first symbol, a duration, a PRB offset, and an RB offset. offset BWP It includes 16 (PUCCH) resources corresponding to the cyclic shift (CS) index set. The UE transmits PUCCH using frequency hopping. For the set of PUCCH resources defined by index, the 16 PUCCH resources (r) are used with the parameters predefined in the table above. PUCCH = 0, 1, 2, ..., 15) can be formed. For example, if BS sets / indicates index 0, 1, or 4 through SIB, the parameter values ​​for each of the 16 different PUCCH resources may be as follows.

[0204]

[0205] If the UE is not provided with the RRC parameter pdsch-HARQ-ACK-Codebook regarding whether the PDSCH HARQ-ACK codebook is semi-static or dynamic, the UE generates at most one HARQ-ACK bit. If the UE provides HARQ-ACK information in a PUCCH transmission in response to detecting DCI format 1_0 or DCI format 1_1, the UE selects the PUCCH resource for the PUCCH transmission from among the 16 PUCCH resources belonging to the PUCCH resource set corresponding to the index obtained through the pucch-ResourceCommon in the SIB, and N, the number of CCEs in the CORESET of the PDCCH reception with DCI format 1_0 or DCI 1_1. CCE , index n of the first CCE for receiving the above PDCCH CCE,0 , the value of the PUCCH resource indicator (PRI) field in the above DCI format 1_0 or DCI format 1_1 △ PRI It can be determined based on. For example, if the UE provides HARQ-ACK information in a PUCCH transmission in response to detecting DCI format 1_0 or DCI format 1_1, the UE uses index r PUCCH r PUCCH resources PUCCH = floor{(2*n CCE,0 ) / N CCE} + 2*△ PRI It is determined as, where 1 ≤ r PUCCH ≤ 15. floor(r PUCCH If / 8) = 0, then the UE, at the first hop, uses the PRB index of the PUCCH transmission as RB offset BWP + floor(r PUCCH / N CS Determined as ), and in the second hop, the PRB index of the above PUCCH transmission is Nsize BWP - 1 - RB offset BWP - floor(r PUCCH / N CS Determined as ), where N CS is the total number of initial cyclic transition indices within the set of initial cyclic transition indices, and the UE is the initial cyclic transition index within the set of initial cyclic transition indices r PUCCH mod N CS It can be determined as. floor(r PUCCH If / 8) = 1, then the UE uses N as the PRB index of the PUCCH transmission at the first hop. size BWP - 1 - RB offset BWP - floor{(r PUCCH - 8) / N CS Determined as}, and in the second hop, the PRB index of the above PUCCH transmission is RB offset BWP + floor{(r PUCCH - 8) / N CS} is determined as, and the UE determines the initial cyclic transition index within the set of initial cyclic transition indices (r PUCCH - 8) mod N CS It can be determined as.

[0206] If a UE has a dedicated PUCCH resource configuration, the UE is provided with one or more PUCCH resources by upper-layer signaling. PUCCH resources may be determined by UCI type (e.g., A / N, SR, CSI). The PUCCH resources used for UCI transmission may be determined based on the UCI (payload) size. For example, the BS configures multiple PUCCH resource sets for the UE, and the UE can select a specific PUCCH resource set corresponding to a specific range based on the range of UCI (payload) sizes (e.g., number of UCI bits). For example, the UE [selects] the number of UCI bits (N UCI You can select one of the following sets of PUCCH resources based on ).

[0207] - PUCCH resource set #0, if UCI bit count =< 2

[0208] - PUCCH resource set #1, if 2 < UCI bit count =< N1

[0209] ...

[0210] - PUCCH resource set #(K-1), if N K-2 < UCI bit count =< N K-1

[0211] Here, K is the number of PUCCH resource sets (K>1), and N i is the maximum number of UCI bits supported by PUCCH resource set #i. For example, PUCCH resource set #1 can be composed of resources of PUCCH format 0 to 1, and other PUCCH resource sets can be composed of resources of PUCCH format 2 to 4 (see Table 5).

[0212] The settings for each PUCCH resource include the PUCCH resource index, the index of the starting PRB, and the settings for one of PUCCH formats 0 through 4. The code rate for multiplexing HARQ-ACK, SR, and CSI report(s) within a PUCCH transmission using PUCCH format 2, PUCCH format 3, or PUCCH format 4 is set for the UE by the BS through the upper layer parameter maxCodeRate. The upper layer parameter maxCodeRate is used to determine how to feed back the UCI on the PUCCH resource for PUCCH format 2, 3, or 4.

[0213] If the UCI type is SR or CSI, the PUCCH resource to be used for UCI transmission within the PUCCH resource set can be set to the UE by the network via upper-layer signaling (e.g., RRC signaling). If the UCI type is HARQ-ACK for SPS (Semi-Persistent Scheduling) PDSCH, the PUCCH resource to be used for UCI transmission within the PUCCH resource set can be set to the UE by the network via upper-layer signaling (e.g., RRC signaling). On the other hand, if the UCI type is HARQ-ACK for PDSCH scheduled by DCI, the PUCCH resource to be used for UCI transmission within the PUCCH resource set can be scheduled based on DCI.

[0214] In the case of DCI-based PUCCH resource scheduling, the BS transmits the DCI to the UE via PDCCH and can indicate the PUCCH resources to be used for UCI transmission within a specific set of PUCCH resources through the ACK / NACK resource indicator (ARI) within the DCI. The ARI is used to indicate PUCCH resources for ACK / NACK transmission and may also be referred to as the PUCCH resource indicator (PRI). Here, the DCI is the DCI used for PDSCH scheduling, and the UCI may include HARQ-ACK for PDSCH. Meanwhile, the BS can set a set of PUCCH resources to the UE using (UE-specific) upper-layer (e.g., RRC) signals, consisting of more PUCCH resources than the number of states that the ARI can represent. In this case, the ARI indicates a subset of PUCCH resources within the PUCCH resource set, and which PUCCH resource to use within the indicated subset of PUCCH resources may be determined according to an implicit rule based on transmission resource information for the PDCCH (e.g., the index of the PDCCH's control channel element (CCE)).

[0215] UCI can also be transmitted through PUSCH, through which UL data is transmitted, and UCI can be transmitted without UL-SCH.

[0216] The UE uses DRX to reduce power consumption. A UE operating based on DRX repeatedly switches ON / OFF for receiving operations. The characteristics of DRX, which is utilized for the purpose of reducing unnecessary power consumption of the UE, are as follows. DRX is defined with a structure for a UE in the RRC_IDLE state where an RRC connection between the UE and the BS is not set up (hereinafter referred to as I-DRX) and a structure for a UE in the RRC_CONNECTED state where an RRC connection between the UE and the BS is set up (hereinafter referred to as C-DRX). Both DRX structures are designed to reduce unnecessary power consumption in periods other than those defined by defining a period during which the UE can expect to receive a DL signal (e.g., active time period or on-duration period) to occur periodically. For reference, in the case of C-DRX, the Rel-16 standard states that the on-duration start position occurs periodically, and the size of the period that can be configured at this time (i.e., DRX cycle) can be determined / set through higher-level signaling, such as RRC signaling provided by the BS to the UE.

[0217] FIG. 12 illustrates a discontinuous reception (DRX) operation. In particular, FIG. 12 illustrates a DRX cycle for a UE in the RRC_CONNECTED state.

[0218] Referring to FIG. 12, the DRX cycle consists of an ON period and an Opportunity for DRX. The DRX cycle defines a time interval in which the ON period is periodically repeated, followed by a possible period of inactivity. The ON period represents the time interval during which the UE performs PDCCH monitoring to receive PDCCHs. When the DRX is set, the UE performs PDCCH monitoring during the ON period. If a PDCCH is successfully detected during the PDCCH monitoring, the UE activates the inactivity timer and remains awake. Conversely, if no PDCCH is successfully detected during the PDCCH monitoring, the UE enters a sleep state after the ON period ends. Thus, when the DRX is set, the UE may perform PDCCH monitoring / reception discontinuously in the time domain when performing the process and / or method according to the implementation(s) of this specification. For example, if DRX is set, the PDCCH reception occasion (e.g., a slot with a PDCCH seek space) in this specification may be set discontinuously according to the DRX setting. On the other hand, if DRX is not set, the UE may perform PDCCH monitoring / reception continuously in the time domain. For example, if DRX is not set, the PDCCH reception occasion (e.g., a slot with a PDCCH seek space) may be set continuously. Meanwhile, regardless of whether DRX is set, PDCCH monitoring may be restricted in time intervals set as measurement gaps. DRX setting information is received through upper layer (e.g., RRC) signaling, and whether DRX is ON / OFF is controlled by the DRX command of the MAC layer. When DRX is set, the UE may perform PDCCH monitoring discontinuously, as exemplified in FIG. 12.

[0219] The following table illustrates the UE process related to DRX. Referring to the table, DRX configuration information is received via upper layer (e.g., RRC) signaling, and whether DRX is ON / OFF is controlled by DRX commands at the MAC layer. When DRX is configured, the UE can perform discontinuous PDCCH monitoring, as illustrated in FIG. 12.

[0220]

[0221] Here, MAC-CellGroupConfig includes configuration information necessary to set MAC parameters for a cell group. MAC-CellGroupConfig may also include configuration information regarding DRX. For example, MAC-CellGroupConfig may include information related to DRX as follows.

[0222] - Value of drx-onDurationTimer: Sets the duration at the start of the DRX cycle.

[0223] - Value of drx-SlotOffset: Sets the delay before starting drx-onDurationTimer.

[0224] - Value of drx-InactivityTimer: Sets the period after the PDCCH that contains a PDCCH directing a new UL or DL ​​transfer for the MAC entity.

[0225] - Value of drxRetransmissionTimerDL (per DL HARQ process except for the broadcast process): Sets the maximum duration until a DL retransmission is received.

[0226] - Value of drxRetransmissionTimerUL (per UL HARQ process): Sets the maximum duration until a grant for UL retransmission is received.

[0227] - Value of drx-HARQ-RTT-TimerDL (per DL HARQ process except for the broadcast process): Sets the maximum period from when the initial DL transmission is received until a DL assignment for HARQ retransmission is received.

[0228] - Value of drx-HARQ-RTT-TimerUL (per UL HARQ process): Sets the maximum period from when a grant for an initial UL transmission is received until a grant for a UL retransmission is received.

[0229] - drx-LongCycleStartOffset: Sets the Long DRX cycle and drx-StartOffset, defining the subframe where the Long and Short DRX cycles start.

[0230] - drx-ShortCycle (optional): Sets the Short DRX cycle.

[0231] - drx-ShortCycleTimer (optional): Sets the duration for which the UE must follow the Short DRX cycle. For example, a value in multiples of the Short DRX cycle can be set by drx-CycleTimer. For example, the value of n can correspond to n*drx-ShortCycle.

[0232] The UE may perform PDCCH monitoring on serving cells within the DRX group if the DRX group is within the active time. Here, the DRX group is a group of serving cells configured by the RRC and having the same DRX active time. Here, the active time is the total duration during which the UE monitors the PDCCH, and may include the ON period of the DRX cycle, the time during which the UE performs continuous reception while the inactivity timer has not expired, and the time during which the UE performs continuous reception while waiting for a retransmission opportunity. For example, when the DRX is configured, the active time for serving cells within the DRX group is i) when the drx-onDurationTimer or drx-InactivityTimer configured for the DRX group is running; or ii) when the drx-RetransmissionTimerDL or drx-RetransmissionTimerUL is running on any serving cell within the DRX group; Or ra-ContentionResolutionTimer or msgB-RsponseWindow is running; or may include a time when a PDCCH directing a new transmission addressed to a C-RNTI addressed to the UE's MAC entity is not received after the successful reception of a random access response to a random access preamble that was not selected by the MAC entity during a contention-based random access preamble.

[0233] The UE can receive one or more DRX groups through RRC signaling from the BS. For example, if two DRX groups are set, each serving cell is uniquely assigned to one of the two DRX groups. The DRX parameters drx-onDurationTimer and drx-InactivityTimer are set separately for each DRX group, and 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 of the DRX groups, and the DRX parameters drx-onDurationTimer and drx-InactivityTimer are set for each DRX group and the remaining DRX parameters are common to the DRX groups, it can be said that the serving cell is associated with only one set of DRX parameters.

[0234] FIG. 13 illustrates the case where Long DRX cycle and Short DRX cycle are set. In particular, FIG. 13 illustrates the case where drx-ShortCycleTimer is set to 2.

[0235] BS can set a Long DRX cycle and an additional Short DRX cycle that is shorter than the Long DRX cycle. If the Short DRX cycle is not set, the UE follows the Long DRX cycle. When setting the Short DRX cycle, BS sets the duration of the Long DRX cycle to be a positive integer multiple of the Short DRX cycle. The same onDurationTimer value is set for both the Long DRX cycle and the Short DRX cycle. If there is no data activity during the ON period of the Long DRX cycle (e.g., no PDCCH reception), the UE follows the Long DRX cycle as if the Short DRX cycle were not set. If there is data activity during the ON period of the Long DRX cycle, for example, while drx-onDurationTimer is running, the UE switches to the Short DRX cycle and follows the Short DRX cycle for a certain period of time (e.g., while drx-ShortCycleTimer is running). At this time, the start of the ON duration in the Short DRX cycle is determined by drx-StartOffset and drx-SlotOffset, just as in the Long DRX cycle. Referring to Fig. 13, if there is no data activity during the time following the Short DRX cycle, for example, if there is no data activity during the interval defined by drx-ShortCycleTimer*drx-ShortCycle, the UE switches to a Long DRX cycle after drx-ShortCycleTimer Short DRX cycles.

[0236] FIG. 14 illustrates paging times that can be monitored by a UE with a specific UE identifier.

[0237] If the UE does not have any ongoing data transmissions or receptions, the UE enters RRC_IDLE or RRC_INACTIVE to conserve power. When DL data for the UE arrives at the network, the network sends a paging message (e.g., Paging DCI) at the paging occasion (PO) to trigger RRC setup procedures, RRC Connection Resume procedures, etc. In multi-beam operations, the UE assumes that the same paging message is repeated in all transmitted beams. The paging message is the same for both radio access network (RAN) initiation paging and core network (CN) initiation paging.

[0238] In this specification, a PDCCH carrying a DCI format with a CRC scrambled in P-RNTI is referred to as a paging PDCCH, and a PDSCH scheduled by said paging PDCCH is referred to as a paging PDSCH. A UE can decode said paging PDSCH based on scheduling information (e.g., frequency domain resource allocation, modulation and coding scheme, etc.) within said paging PDCCH. A paging PDSCH carries paging messages, which are used for notification to one or more UEs and may include one or more UE identifiers (IDs).

[0239] In each DRX cycle, the UE remains in sleep mode during the OFF period but is expected to wake up during the paging period to monitor the PDCCH for paging. The UE monitors one PO per DRX cycle. A paging DRX (also called an idle mode DRX) is defined, which requires a UE that is RRC_IDLE or RRC_INACTIVE to monitor paging channels for only one PO per DRX cycle. In each idle mode DRX (I-DRX) cycle, the UE monitors only one PO within a specific paging frame (PF). When a PDCCH for paging is received in a PO, the UE decodes the PDCCH to receive paging messages. If the paging is not for the UE, the UE goes back to sleep until the next PO.

[0240] A paging frame (PF) is a radio frame and may contain one or more PO(s) or a starting point of PO. The PF and PO for paging can be determined by predefined formulas. For example, in some implementations, the system frame number (SFN) for the PF can be determined by (SFN + PF_offset) mod T = (T div N) * (UE_ID mod N), and the index i_s indicating the index of the PO can be determined by i_s = floor(UE_ID) mod Ns, where T is the DRX cycle of the UE determined by the minimum value of the default DRX value broadcast as UE-specific DRX value(s) and / or system information, N is the total number of paging frames in T, Ns is the number of paging times for the PF, PF_offset is the offset used for determining the PF, and UE_ID is a value determined based on 5G-S-TMSI. A parameter Ns regarding the number of paging occurrences per paging frame, a parameter nAndPagingFrameOffset used to derive the total number of paging frames in T, a parameter nrofPDCCH-MonitoringOccasionsPerSSB-InPO regarding the number of PDCCH monitoring occurrences corresponding to SSBs in paging occurrences, and the length of the default DRX cycle can be signaled by SIB1, and the values ​​of N and PF_offset are derived from the parameter nAndPagingFrameOffset.

[0241] A PO is a set of PDCCH monitoring times and may consist of multiple time slots (e.g., subframes or OFDM symbols), and a DCI with a CRC scrambled from the PO to P-RNTI may be transmitted. For example, a PO is a set of 'S*X' consecutive PDCCH monitoring times, where 'S' is the number of actually transmitted SSBs determined by the parameter ssb-PositionsInBurst in SIB1, and 'X' is nrofPDCCH-MonitoringOccasionPerSSB-InPO if set and equal to 1 otherwise. The parameter ssb-PositionsInBurst indicates the time domain indications of SSBs transmitted within a half frame containing SS / PBCH blocks, and the parameter nrofPDCCH-MonitoringOccasionPerSSB-InPO indicates the number of PDCCH monitoring times corresponding to SSBs within the paging time. PDCCH monitoring times for paging can be determined based on the parameter firstPDCCH-MonitoringOccasionOfPO, which indicates the first PDCCH monitoring time for paging of each PO of the PF, and the parameter nrofPDCCH-MonitoringOccasionsPerSSB-InPO. The parameter firstPDCCH-MonitoringOccasionOfPO may be signaled by SIB1 for paging in the initial downlink BWP, and may be signaled by the corresponding BWP setting for paging in DL BWPs other than the initial downlink BWP.

[0242] Indicates the number of PDCCH monitoring periods corresponding to SSB within the paging period.

[0243] Energy conservation in BSs is considered important in wireless communication systems, including 3GPP, because it can contribute to building eco-friendly networks by reducing carbon emissions and lowering the operational expenditure (OPEX) of telecommunication operators. In particular, as the introduction of 5G communication requires high transmission rates, BSs must equip a larger number of antennas and provide services through wider bandwidths and frequency bands. As a result, energy costs for BSs have reportedly reached 20% of total OPEX, according to recent studies. Due to this increased interest in BS energy conservation, a new study item titled "study on network energy savings" was approved in 3GPP NR release 18. For example, to improve energy saving capabilities in terms of transmission and reception of BS, this study investigates how to achieve more efficient operation of transmission and / or reception with one or more network energy saving techniques in time, frequency, space, and power domains, dynamically and / or semi-statically, and with finer granularity adaptation, using potential support / feedback and potential UE support information of the UE.

[0244] The following enhancement techniques may be considered.

[0245] Specify SSB-less SCell operation for inter-band CA for FR1 and co-located cells, where a UE measures SSB transmitted on PCell or another SCell for an SCell's time / frequency synchronization (including downlink AGC), and L1 / L3 measurements, including potential enhancement on SCell activation procedures if necessary.

[0246] Specify enhancement on cell DTX / DRX mechanism including the alignment of cell DTX / DRX and UE DRX in RRC_CONNECTED mode, and inter-node information exchange on cell DTX / DRX

[0247] Specify the following techniques in spatial and power domains

[0248] Specify necessary enhancements on CSI and beam management related procedures, including measurement and report, and signaling, to enable efficient adaptation of spatial elements (e.g., antenna ports, active transceiver chains).

[0249] Specify necessary enhancements on CSI-related procedures, including measurement and report, and signaling, to enable efficient adaptation of power offset values ​​between PDSCH and CSI-RS.

[0250] Specify mechanism(s) to prevent legacy UEs camping on cells adopting the Rel-18 NES techniques, if necessary.

[0251] Specify conditional handover (CHO) procedure enhancement(s) in case source / target cell is in NES mode.

[0252] Specify inter-node beam activation and enhancements on restricting paging in a limited area.

[0253] If necessary, specify the corresponding radio resource management / radio frequency (RRM / RF) core requirements for the above features.

[0254] BS can apply techniques such as adjusting the on / off duration in the time axis for NES purposes, adjusting transmit / receive resources for UE-common or UE-specific signals / channels, changing the amount of resources in the frequency axis, adjusting the transmission power, or turning on / off antenna port(s) or TRP(s), etc. in the spatial domain. The state in which such techniques(s) (hereinafter referred to as NES_tech for convenience) are applied is called NES mode or NES state.

[0255] Figure 15 illustrates the operation procedure in a BS that supports network energy saving (NES) technology.

[0256] Referring to FIG. 15, the BS identifies or determines the NES solution(s) to be applied (S1501). The NES solution(s) may be related to the control of signal transmission / reception (e.g., on / off), beam operation, handover procedures, channel measurement and reporting, etc. Which NES solution(s) to apply may be adaptedly selected based on the current situation (e.g., cell load level, characteristics of connected UEs, etc.) or may be predefined. The BS that has identified (or determined) the NES solution(s) may perform signaling for the NES (S1503). The specific signaling procedure may vary depending on the identified NES solution(s). For example, the BS may transmit common information regarding the NES solution(s), transmit configuration information necessary for NES operation to at least one UE, or transmit control information regarding the progress of NES operation to at least one UE. Additionally, the BS may receive capability information related to the NES from at least one UE. Afterward, BS can perform operations for NES (S1505). At this time, BS can perform operations for NES based on the signaling performed earlier. For example, depending on the system information, configuration information, and control information transmitted through the signaling, BS can turn on or off the transmission / reception of a specific signal, turn on / off elements of the spatial domain, or adjust resources for the transmission / reception of a measurement signal.

[0257] NES technology can be performed through a procedure as shown in Fig. 15. Examples of NES solutions that can be performed by a procedure as shown in Fig. 15 are as follows.

[0258] Intra-system energy saving solution: A radio access network (RAN) node may request a neighbor RAN node to switch at least one SSB beam into its deactivated cell, or perform paging using a limited set of beams to an inactive UE (e.g., stationary UE).

[0259] Inter-system energy saving solution: An NG-RAN node owning a capacity booster cell can autonomously switch the cell to an inactive state.

[0260] > SSB-less SCell solution: If an SSB measurement timing configuration (SMTC), which is an SSB-based radio resource management (RRM) measurement timing configuration, is not provided for the SCell, the UE can obtain timing reference and automatic gain control (AGC) sources from other serving cells. In FR1 or FR2, the BS can set up intra-band carrier aggregation (CA) or inter-band CA including the SCell without SSB transmission, in which case SSB / SIB transmission can be triggered by the UE's wake-up signal (WUS). Accordingly, as the periododicity of common channels / signals such as SSB increases, the BS can remain in a sleep state for a longer time.

[0261] Cell DTX / DRX Solution: To reduce the downlink transmission / uplink reception active time of a BS, periodic cell DTX / DRX patterns (e.g., active and inactive periods) may be configured commonly for UEs within a cell having the corresponding feature. Here, the cell DTX pattern and the cell DRX pattern may be configured and activated separately, and up to two cell DTX / DRX patterns may be configured per MAC entity. When cell DTX is configured and activated, at least one of monitoring for semi-persistent scheduling (SPS) occasions or PDCCH monitoring may be suspended during the cell DTX inactive period. When cell DRX is configured and activated, at least one of transmission or scheduling request (SR) transmission from a configured grant (CG) resource may be suspended during the cell DRX inactive period. Cell DTX / DRX can be enabled / disabled via RRC signaling or L1 group common signaling (e.g., PDCCH over CSS). Parameters such as active duration and cycle can be set for Cell DTX / DRX. The active duration is the period during which the UE waits to transmit an SR or CG after receiving a PDCCH or SPS occasion, and the cycle specifies the periodic repetition of the active and inactive periods. When both Cell DTX and Cell DRX are enabled, parameters such as the active duration and cycle are common.If the BS detects an emergency call or a public safety-related service (e.g., multimedia priority service (MPS) or mission critical service (MCS)), the network may release or deactivate the cell DTX / DRX settings so as not to affect the service. Additionally, at least some overlap is required between the active period of the UE's connected mode DRX and the active period of the cell DTX / DRX. For example, the UE's connected mode DRX periododicity may be a multiple of the cell DTX / DRX periododicity, or vice versa.

[0262] Conditional Handover (CHO) Solution: A CHO procedure, performed in such a way that the execution of a handover is determined by the UE, is used while NES technology is applied (e.g., when a cell enables or disables Cell DTX / DRX). In this case, the UE may use NES-specific CHO events to execute a CHO for a candidate cell, and as an additional triggering condition for this, the reception of a DCI that enables CHO condition(s) set as NES event indications may be applied.

[0263] Spatial and power domain adaptation solution: To support BS for transceiver muting and / or transmission power adaptation, the UE can be configured to report multiple CSI entries in CSI reporting based on multiple sub-configurations. Each sub-configuration can correspond to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a data channel (e.g., PDSCH) and power offset between CSI-RS. Depending on the application of the spatial and power domain adaptation solution, CSI configuration, measurement, and / or reporting behavior may be affected.

[0264] The current standard document 3GPP TS 38.213 discloses the random access process and PRACH configuration as follows. For a more detailed description of the RRC parameters mentioned below, refer to 3GPP TS 38.331.

[0265] Prior to the initiation of the physical random access process, Layer 1 receives a set of SS / PBCH block indices from the upper layers and provides the corresponding set of RSRP measurements to the upper layers.

[0266] Prior to the initiation of the physical random access process, Layer 1 may receive an indication from the upper layers to perform a Type-1 random access process or a Type-2 random access process.

[0267] Prior to the initiation of the physical random access process, Layer 1 receives the following information from the upper layers:

[0268] - Physical Random Access Channel (PRACH) transmission parameters (PRACH preamble format, time resources, and frequency resources for PRACH transmission).

[0269] - Parameters for determining the root sequences within the PRACH preamble sequence set and their cylic shifts (index to logical root sequence table, cylic shifts (N CS ), and set type (unrestricted, restricted set A, or restricted set B)).

[0270] From a physical layer perspective, the type-1 L1 random access process includes the transmission of a random access preamble (Msg1) in a PRACH, a random access response (RAR) with a PDCCH / PDSCH (Msg2), and, when applicable, a PUSCH scheduled by a RAR UL grant, and a transmission of a PDSCH for contention resolution.

[0271] From a physical layer perspective, the above-mentioned type-2 L1 random access process includes a random access preamble in a PRACH and the transmission of a PUSCH (MsgA), the reception of a RAR message with a PDCCH / PDSCH (MsgB), and, if applicable, the transmission of a PDSCH for contention resolution with a PUSCH scheduled by a fallback RAR UL grant.

[0272] When a random access process for a UE is initiated by a PDCCH order, the PRACH transmission has the same subcarrier spacing (SCS) as the PRACH transmission initiated by the upper layers.

[0273] When a UE is configured to have two UL carriers for a serving cell and the UE detects a PDCCH command, the UE determines the UL carrier for the corresponding PRACH transmission using the UL / supplementary (supplementary UL, SUL) indicator field value from the detected PDCCH command.

[0274] The physical random access process for the UE is triggered upon a request for a PRACH transmission by upper layers or by a PDCCH command to the cell. Configuration by upper layers for a PRACH transmission includes the following:

[0275] - Settings for PRACH transmission on the above cell.

[0276] - Preamble Index, Preamble SCS, PRACH Target Reception Power P PRACH,target , when applicable, the corresponding RA-RNTI, PRACH resource for the above cell.

[0277] - If the UE would transmit the PRACH with repetitions, N for transmitting the PRACH rep preamble >1 Number of preamble iterations.

[0278] The UE, on the designated PRACH resource or N rep preamble For preamble iterations, use the same spatial filter to N rep preamble On a determined set of resources, transmission power P as described in Section 7.4 of 3GPP TS 38.214 PRACH,b,f,c(i) A UE transmits a PRACH on a cell using the selected PRACH format with transmission power P PRACH,b,f,c (i), as described in section 7.4 of 3GPP TS 38.214, on the indicated PRACH resource or on a determined set of N rep preamble resources using a same spatial filter in case of N rep preamble preamble repetitions.)

[0279] For a Type-1 random access process, the UE is provided by the RRC parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB with the number N of SS / PBCH block indexes associated with a single PRACH occasion and the number R of contention-based preambles per SS / PBCH block index per valid PRACH occasion.

[0280] In the case of a Type-1 random access process having a common configuration of PRACH times, the UE is provided with the number of SS / PBCH block indices N associated with one PRACH time by the RRC parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB and the number of contention-based preambles Q per SS / PBCH block index per valid PRACH time by the RRC parameter msgA-CB-PreamblesPerSSB-PerSharedRO. PRACH transmission may take place on a subset of PRACH times associated with the same SS / PBCH block index within an SSB-RO mapping cycle for a UE provided with a PRACH mask index by the RRC parameter msgA-SSB-SharedRO-MaskIndex in accordance with 3GPP TS 38.321.

[0281] For a Type-2 random access procedure with a separate configuration of PRACH occasions with a Type-1 random access procedure, the UE is provided with the number of SS / PBCH block indices N associated with one PRACH occasion and the number of contention-based preambles R per SS / PBCH block index per valid PRACH occasion, the number of SS / PBCH block indices N associated with one PRACH occation, by the RRC parameter msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB when provided, and otherwise by ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0282] For a random access process associated with a feature combination indicated by the RRC information element FeatureCombinationPreambles (which associates a set of feature combinations with preambles), the UE is provided with the number of SS / PBCH block indices N associated with one PRACH time by the RRC parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB or, if provided, msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB, and the number of contention-based preambles S per SS / PBCH block index per valid PRACH time by the RRC parameter startPreambleForThisPartition and the RRC parameter numberOfPreamblesPerSSB-ForThisPartition. For a UE provided with a PRACH mask index by ssb-SharedRO-MaskIndex in accordance with 3GPP TS 38.321, the PRACH associated with the same SS / PBCH block index within the SSB-RO mapping cycle It can be done on subsets of periods.

[0283] Figure 16 illustrates the mapping relationship between RACH periods and SSBs. In Figure 16, msg1-FDM is the number of ROs multiplexed in the frequency domain, and ssb-perRACH-Occasion is the number of SSBs mapped to one RO.

[0284] For a Type-1 random access process, or for a Type-2 random access process having a separate configuration of PRACH periods from the Type-1 random access process, if N < 1, one SS / PBCH block index is mapped to 1 / N consecutive valid PRACH periods, and per valid PRACH period, R contention-based preambles with consecutive indices associated with the said SS / PBCH block index start from preamble index 0. If N ≥ 1, per valid PRACH period, R contention-based preambles with consecutive indices associated with the SS / PBCH block index n start from preamble index n*N total preamble Starting from / N, 0 ≤ n ≤ N-1, and N total preamble is provided by totalNumberOfRA-Preambles for a type-1 random connection process, or by msgA-TotalNumberOfRA-Preambles for a type-2 random connection process that has a separate configuration of PRACH times from the type-1 random connection process, and is an integer multiple of N.

[0285] For a Type-2 random access process having common settings for PRACH periods with a Type-1 random access process, if N < 1, a single SS / PBCH block index is mapped to 1 / N consecutive valid PRACH periods, and Q contention-based preambles having consecutive indices associated with the said SS / PBCH block index per valid PRACH period start from preamble index R. If N ≥ 1, Q contention-based preambles having consecutive indices associated with the SS / PBCH block index n per valid PRACH period start from preamble index n*N total preamble Starting from / N + R, where 0 ≤ n ≤ N-1 and N total preambleThe type-1 random connection process is provided by totalNumberOfRA-Preambles.

[0286] In the case of link recovery, the UE is provided with N SS / PBCH block indices associated with a single PRACH time by the RRC parameter ssb-perRACH-Occasion in the RRC configuration BeamFailureRecoveryConfig. In the case of a dedicated RACH configuration provided by the RRC configuration RACH-ConfigDedicated, if parameters cfra for contention-free random access to a given target cell are provided, the UE is provided with N SS / PBCH block indices associated with a single PRACH time by the parameter ssb-perRACH-Occasion regarding random access times for contention-free random access. If N < 1, a single SS / PBCH block index is mapped to 1 / N consecutive valid PRACH times. If N ≥ 1, all N consecutive SS / PBCH block indices are associated with a single PRACH time.

[0287] The SS / PBCH block indices provided by ssb-PositionsInBurst in SIB1 or RRC configuration ServingCellConfigCommon are mapped to valid PRACH times in the following order, and the parameters are described in 3GPP TS 38.211.

[0288] First, in the increasing order of preamble indices within a single PRACH period

[0289] Second, in increasing order of frequency resource indices for frequency-multiplexed PRACH periods

[0290] Third, in increasing order of time resource indices for time-multiplexed PRACH periods within the PRACH slot

[0291] Fourth, in increasing order of the indices for the PRACH slots

[0292] The association period, starting from frame 0, for mapping SS / PBCH block indexes to PRACH periods is N SSB Tx an association period, starting from frame 0, for mapping SS / PBCH block indexes to PRACH occasions is the smallest integer number in the set determined by the PRACH configuration period according to the following table such that N SSB Tx SS / PBCH block indexes are mapped at least once to the PRACH occasions within the association period), where UE is N from the value of ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon SSB Tx Gets.

[0293] The following table illustrates the mapping between the PRACH setting period and the association period between the SS / PBCH block and the PRACH occasion.

[0294]

[0295] In the case of a PRACH transmission triggered by upper layers, if the RRC parameter ssb-ResourceList is provided, the PRACH mask index is indicated by the RRC parameter ra-ssb-OccasionMaskIndex, which indicates the PRACH timing for the PRACH transmission.

[0296] PRACH periods are mapped consecutively per corresponding SS / PBCH block index. The indexing of the PRACH periods indicated by the mask index value is reset per mapping cycle of consecutive PRACH periods per SS / PBCH block index. Within the first available mapping cycle, the UE selects the PRACH period indicated by the PRACH mask index value for the indicated SS / PBCH block index for PRACH transmission.

[0297] For the preamble index indicated above, the ordering of the PRACH periods is

[0298] First, regarding the frequency multiplexed PRACH periods, it is an increasing order of frequency resource indices.

[0299] Second, regarding the time-multiplexed PRACH periods within the PRACH slot, it is an increasing order of time resource indices.

[0300] Third, it is the increasing order of the indices for the PRACH slots.

[0301] Technologies found to be useful through research related to base station energy saving need to be adopted, even if they have not yet been adopted into standards. Currently, the cell DTX / DRX mechanism introduced for network energy saving is designed to affect only the transmission / reception of UE-dedicated signals / channels for connected-mode UEs, and since common signals / channels such as SSB / SIB1 / PRACH are always transmitted periodically, the energy saving gains and opportunities for BS are limited.

[0302] Some implementations of this specification are described below regarding a method for configuring different transmission occasions of common signals / channels such as SSB / PRACH during active / non-active periods for energy saving of BS, a configuration method considering the interaction between connected cell DTX and idle / inactive cell DTX, a method of operating active / non-active periods from the perspective of BS when configuring idle mode cell DTX / DRX, and a neighbor cell measurement configuration method considering the active / non-active periods of cell DTX / DRX.

[0303] Cell DTX / DRX settings may include parameters such as periodicity, slot / offset, and duration, similar to the UE's C-DRX settings. Cell DTX settings and Cell DRX settings may be configured and activated / deactivated independently, allowing the cell to operate according to the cell DTX and / or cell DRX settings. For example, the cell may operate according to the cell DTX settings by configuring and activating only the cell DTX without configuring the cell DRX, or conversely, the cell may operate according to the DRX settings by configuring only the cell DRX without configuring the cell DTX. Even if both cell DTX and cell DRX are configured, only one of the settings may be activated, allowing the cell to operate according to the activated setting. Cell DTX / DRX operation can be configured with a structure similar to the UE's C-DRX, comprising an active period (e.g., On period) during which all signals and channels are transmitted / received without restriction, and a non-active period during which transmission / reception of all signals and channels is turned OFF, or transmission / reception of specific signals and channels is performed restrictively, for example, during time periods outside the active period, only reception such as PDCCH transmission or RACH / SR PUCCH is allowed. Cell DTX / DRX configuration can be set and enabled solely via RRC, or all / some parameter(s) can be set via RRC and enabled through L1 signaling such as PDCCH / DCI (e.g., Group Common DCI). During the active period of Cell DTX / DRX, transmission / reception of all signals and channels can be performed without special transmission / reception restrictions, just like the normal operation of the BS.Time intervals outside the active interval are basically considered to be non-active intervals, and there may be restrictions on transmission / reception other than signals and channels defined in advance (standards, etc.). Since BS can obtain energy saving (ES) gains through operations that perform only minimal transmission / reception, the operation during time intervals outside the active interval can be considered as the operation when the NES state / mode is ON.

[0304] Even for a UE in the RRC_IDLE or RRC_INACTIVE state, a semi-static ON / OFF duration pattern can be set via the Cell DTX / DRX settings, and signals / channels that will not perform transmission / reception during the OFF period can be pre-configured. For example, during a paging occasion (PO) that is fully included in or partially overlaps with the Cell DTX non-active period, the UE does not need to monitor the paging DCI, or the reception of common broadcast signals / channels such as SSB / SIB1 may be turned OFF. Additionally, for a RACH occasion (RO) resource that is fully included in or partially overlaps with the Cell DRX non-active period, the corresponding RO may be considered a resource that cannot be used for PRACH transmission. Additionally, the UE may maintain the cell DTX / DRX settings received in connected mode even when transitioning to a different RRC state (due to RRC release, etc.), or it may separately receive parameter(s) to be applied per RRC state or settings for signals / channels to be turned OFF via DTX / DRX settings and apply them according to its own RRC state.

[0305] Meanwhile, in the RRC_IDLE state, the UE is not registered with a specific cell and does not possess the access stratum (AS) context or information received from the BS. The BS can initiate the RRC disconnection process to transition a UE in the RRC_CONNECTED state to the RRC_IDLE state, or the UE may request this from the BS. In the RRC_IDLE state, the UE is in a kind of sleep mode and periodically wakes up according to the (I-)DRX cycle set via the SIB (e.g., SIB1) or by the BS to monitor paging messages transmitted by the BS. The BS can inform UEs in the RRC_IDLE state whether there is data to receive via paging messages, and can notify them of system information (SI) changes and ETWS / CMAS instructions via short messages.

[0306] A UE in the RRC_IDLE state monitors paging channels for core network (CN) initiated paging, and a UE in the RRC_INACTIVE state monitors paging channels for radio access network (RAN) initiated paging. However, UEs do not need to monitor these paging channels continuously; power consumption can be reduced by monitoring paging channel(s) only at one paging occasion (PO) per DRX cycle, depending on the paging DRX cycle. A UE in the RRC_IDLE state may send a PRACH to the BS when it wishes to transition to the RRC_CONNECTED state or request an on-demand SI, but may not perform any UL transmissions other than PRACH.

[0307] As previously explained, the RRC_INACTIVE state is used not only to reduce the signaling overhead of the BS but also to reduce the latency associated with the transition to the RRC_CONNECTED state. Additionally, a UE in the RRC_INACTIVE state can behave similarly to the RRC_IDLE state to conserve power. In the RRC_INACTIVE state, the state transition from the inactive state to the connected state can be performed more quickly because the AS context is stored in the UE and the BS. In the RRC_INACTIVE state, the UE remains in the CN-CONNECTED state.

[0308] Similar to RRC_IDLE, the UE is in a sleep mode and periodically wakes up according to the DRX cycle set by the SIB or BS to monitor for paging messages transmitted by the BS. The BS can notify the UE in the RRC_INACTIVE state whether there is data to receive via paging messages, and can perform SI changes and ETWS / CMAS instructions to the UE in the RRC_INACTIVE state via short messages. As with the RRC_IDLE state, the PDCCH containing paging messages and short messages is scrambled into a P-RNTI, and an inactive RNTI (I-RNTI) may be used to identify the suspended UE context. When the BS moves the UE from the RRC_CONNECTED state to the RRC_INACTIVE state, it can assign an I-RNTI to the UE via SuspendConfig within the RRCRelease message. In the RRC_INACTIVE state, the UE may transmit PRACH to transition to the RRC_CONNECTED state or to request an on-demand SI, and may not transmit any UL signals / channels other than PRACH.

[0309] For convenience, a UE in the RRC_IDLE state may be referred to as a UE operating in idle mode, and a UE in the RRC_INACTIVE state may be referred to as a UE operating in inactive mode.

[0310] <Method #1> A method of setting different timings for the common signal / channel for the non-active and active periods of Cell DTX / DRX.

[0311] In cases where multiple cell DTX / DRX settings can be configured for a single cell (e.g., multiple cell DTX / DRX settings), the UE can receive cell DTX / DRX settings to be applied to the active and inactive periods separately, allowing the type, periododicity, and timing of signals / channels to be transmitted / received to be configured differently during the active and inactive periods. Cell DTX / DRX settings may be provided based on the RRC status. The types of signals / channels with varying periods may also differ depending on the active / inactive period for each cell DTX / DR setting.

[0312] For example, Cell DTX setting #1 is a setting applied to idle / inactive mode and the SSB periods for active and inactive periods are set to 20ms and 80ms, respectively; Cell DTX setting #2 is a setting applied to idle / inactive mode and the SSB periods for active and inactive periods are set to 20ms and 160ms, respectively; and Cell DTX setting #3 is a setting applied to connected mode and the SSB periods for active and inactive periods are set to 20ms and 40ms, respectively, and so on, the transmission periods of the SSB for active and inactive periods can be set differently for each Cell DTX setting. If multiple Cell DTX / DRX settings are provided for a single RRC state, which Cell DTX / DRX setting is applied first may be provided, or the standard document may specify that the Cell DTX / DRX setting with the lowest or highest setting index is applied.

[0313] In some implementations, cell DTX / DRX settings are provided only for active periods, and for non-active periods, the timing of a specific signal / channel for the non-active period may be determined by applying a mask or windowing / puncturing, etc., to a time or time group determined according to the settings. For example, if an SSB is configured (via cell DTX / DRX settings or other higher-level signals) and / or defined (in standard documents, etc.) as a signal / channel affected by a cell DTX setting, for SSB bursts included within a time period configured as a non-active period, some or all SSB indices constituting the SSB burst may be configured / instructed via a (group-common) DCI or MAC control element (CE) so that some or all SSB indices constituting the SSB burst are punctured (e.g., if the SSBs constituting the SSB burst overlap with the non-active period, instead of the entire SSB burst being dropped / omitted, only the SSB(s) of the overlapping SSB index(s) are dropped). At this time, the SSB index to be punctured may be pre-configured, or the respective SSB indices for the multiple SSBs included in the SSB burst, or the SSB index(s) or SSB index group(s) of the SSB(s) that are not punctured or transmitted among the pre-configured multiple candidate SSB indices / SSB index groups, may be dynamically indicated via (group-common) DCI or MAC CE. Alternatively, if a pre-configured window / timer / duration is set and windowing is indicated via (group-common) DCI or MAC CE, all SSB transmissions may be turned OFF during the window / timer / duration within the non-active period after a certain delay (e.g., considering the UE's processing delay). In this case, regarding the window / timer / duration, multiple candidate values ​​may be set via upper-layer signals, and one of those values ​​may be directly indicated via (group-common) DCI or MAC CE.

[0314] As another example, if PRACH is defined as a signal / channel affected by a cell DRX setting (through a cell DTX / DRX setting or other higher-level signal) and / or (in standard documents, etc.), some or all of the ROs configured within the non-active period may be turned OFF / deactivated through PRACH masking.

[0315] Referring to 3GPP TS 38.321, the UE may dynamically be indicated one of the PRACH mask indices in Table 7.4-1 of 3GPP TS 38.321 via a 4-bit field in DCI format 1_0, and these parameters (e.g., PRACH mask index) indicate one of the indices in Table 7.4-1 of 3GPP TS 38.321 as an integer value from 0 to 15, and the PRACH timing index is determined by SSB-to-RO mapping. Referring to 3GPP TS 38.213, for example, PRACH timings are mapped consequentially by the corresponding SS / PBCH block index (also called the SSB index). The indexing of the PRACH occasion indicated by the mask index value is reset per mapping cycle of consecutive PRACH occasions per SS / PBCH block index. The UE selects for a PRACH transmission the PRACH occasion indicated by the PRACH mask index value for the SS / PBCH block index indicated by the PDCCH order in the first available mapping cycle. For example, the PRACH occasion index is 3GPP TS 38.Indexing is performed as described in 213, determined by the parameter ssb-perRACH-Occasion value N, which relates to the number of SSBs mapped per RO; if N is greater than 1, all ROs have the same PRACH time index, and if N is less than 1, N PRACH time indices mapped to the same SSB index in the frequency domain can be indexed sequentially starting from the lowest frequency RO. The following table is Table 7.4-1 of 3GPP TS 38.321 and provides examples of PRACH mask index values.

[0316]

[0317] Referring to the table above, the PRACH mask index values ​​defined in the current TS 38.321 standard range from 0 to 10, and it is possible to indicate various available PRACH occasion indices (POI), specific PRACH occasion indices, and even / odd PRACH occasion indices. The UE can set / instruct specific PRACH mask index values ​​defined in the table above via (group-common) DCI or MAC CE, and use only the corresponding PRACH occasion index as an allowed RO, or conversely, interpret it as a muted RO, thereby allowing only some ROs / RO groups among the ROs set within the cell DRX non-active period to be used for PRACH transmission. Additionally, among the PRACH mask indices defined in the table above, unused reserved states may be utilized to indicate additional PRACH timing indices (groups), or to indicate new PRACH timing indices by overriding the allowed PRACH timings indicated by existing PRACH mask index values. Alternatively, a table of PRACH mask values ​​for masking RO within non-active intervals may be separately defined in the standard document or configured from the BS through cell DRX settings.

[0318] Although some implementations of this specification have been described above using SSB as a signal / channel affected by cell DTX settings and PRACH as a signal / channel affected by cell DRX settings as examples, the previously proposed methods can also be applied to other common signal(s) / channel(s) (e.g., paging / SIB1, etc.) and UE-specific signal(s) / channel(s) (e.g., SRS / (CG-)PUSCH, etc.) to set different transmission timings for non-active periods.

[0319] <Method #2> Method for configuring multiple cell DTX / DRX settings considering the interaction between connected mode cell DTX / DRX settings and idle / inactive mode cell DTX / DRX settings, and method for UE transmit / receive operations in active / inactive periods

[0320] When multiple cell DTX / DRX settings can be configured for a single cell, the UE may receive connected mode cell DTX / DRX settings and idle / inactive mode cell DTX / DRX settings separately. For example, in a situation where the respective cell DTX / DRX ON / OFF patterns for the non-connected mode RRC state and the connected mode RRC state are configured to overlap, the UE may be considered to operate by following the cell DTX / DRX pattern associated with its own RRC state while also taking into account the ON / OFF pattern associated with the other RRC state. In such a situation where two cell DTX / DRX settings are configured independently, if the active / inactive intervals of the connected mode cell DTX / DRX settings and the active / inactive intervals of the idle / inactive mode cell DTX / DRX settings overlap, it may be necessary to pre-define / configure the UE's behavior during the overlapping intervals. For example, with the idle / inactive mode cell DTX / DRX configured first, the active / inactive period of the connection mode cell DTX / DRX configuration can be configured / defined to be configured only within the active period of the idle / inactive mode cell DTX / DRX configuration. Specifically, during the inactive period of the idle / inactive mode cell DTX / DRX configuration, the UE behaves as if it were in the inactive period of the connection mode cell DTX / DRX configuration, and the transmission / reception of signals / channels configured / defined to be affected by the connection mode cell DTX / DRX configuration only within the inactive period of the connection mode cell DTX / DRX configuration that is included within the active period of the idle / inactive mode cell DTX / DRX configuration can be configured differently from the active period.

[0321] For example, if CG PUSCH transmission is allowed during the active period of the connection mode cell DRX setting and not allowed during the inactive period, the UE's CG PUSCH transmission may be allowed during the CG period that falls within the active period of the connection mode cell DRX setting within the active period of the idle / inactive mode cell DRX setting (e.g., within the time period where the active periods of the two settings overlap), but may be configured / defined so that CG PUSCH transmission is not allowed during the CG period that falls within the active period of the connection mode cell DRX setting within the inactive period of the idle / inactive mode cell DRX setting (e.g., within the time period where the active periods of the two settings overlap).

[0322] In some implementations, when a UE receives an idle / inactive mode cell DTX / DRX setting and a connected mode cell DTX / DRX setting, an association can be established between the two settings, and since one or more cell DTX / DRX settings can be established for each mode (e.g., one or more DTX / DRX settings are provided for a non-connected mode RRC state and one or more DTX / DRX settings are provided for a connected mode RRC state), an association is established between the multiple configured idle / inactive mode cell DTX / DRX settings and the connected mode cell DTX / DRX setting, so that when a specific idle / inactive mode cell DTX / DRX setting is activated, the associated connected mode cell DTX / DRX setting is activated and applied to the UE. For example, if idle / inactive mode cell DTX / DRX settings #1 and #2, and connected mode cell DTX / DRX settings #1, #2, and #3 are provided for a cell, an association can be established between connected mode cell DTX / DRX setting #3 and idle / inactive mode cell DTX / DRX setting #2 and connected mode cell DTX / DRX setting #1.

[0323] <Method #3> Method for BS and UE Transmit / Receive Operations in Active / Inactive Periods When Cell DTX / DRX Settings in Idle / Inactive Mode Are Enabled

[0324] High energy saving gains can be achieved by setting a long period for common signals / channels, such as periodically transmitted SSB / SIB, or by turning off SSB / SIB transmission during specific time intervals. However, since SSB and SIB are important channels used not only for time / frequency synchronization but also for radio link monitoring (RLM) / radio resource management (RRM) measurements and acquiring system information, changing the transmission period to a long one or turning off the transmission itself may degrade UE performance. Therefore, the common signal / channel transmission periods in the active and inactive periods of the cell DTX / DRX settings can be set differently; for example, an SSB with a period of 20ms can be transmitted during the active period, and an SSB with a period of 80ms can be transmitted during the inactive period. However, since setting the time(s) of sparse common signal / channel within these non-active periods can degrade NES gain or the reception performance of the common signal / channel, a method may be considered to transmit the common signal / channel (e.g., SSB / SIB / PRACH / Paging / other SI, etc.) always-on during the active period of the cell DTX / DRX setting and to operate / transmit on an on-demand basis during the non-active period.

[0325] For example, if the active period of the cell DTX settings is always configured to have periodic SSB / SIB1 transmission with a 20ms period, and the inactive period is configured to have SSB / SIB1 transmission only on demand, the UE can notify the BS that it needs to receive SSB / SIB1 by sending a UL wakeup signal (WUS) (e.g., PRACH / (CG-)PUSCH / (SR-)PUCCH / SRS, etc.) from a pre-configured resource only when it needs to receive SSB / SIB1 during the inactive period, thereby receiving SSB / SIB1 again with a 20ms period (or a specific period pre-configured / instructed for the inactive period) in all or part of the time interval within the inactive period (e.g., within a pre-configured time window).

[0326] <Method #4> A method for setting independent SMTC or measObjectNR settings based on the active / inactive intervals of cells where cell DTX / DRX settings are enabled and activated.

[0327] SMTC refers to an SSB-based RRM measurement timing configuration, and is a period in which measurement resources for RRM are set, similar to the discovery measurement timing configuration (DMTC) of an LTE system. The UE sets up the first SS / PBCH block measurement timing configuration according to the periododicityAndOffset received within the RRC configuration SSB-MTC, which is used to set the measurement timing configurations—that is, the timing times—for the UE to measure SSBs. The first subframe of each SMTC occasion occurs at the system frame number (SFN) and subframe of an NR special cell (SpCell) that satisfies the following conditions:

[0328] > SFN modT= (FLOOR(Offset / 10)),

[0329] If the above Periodicity is greater than sf5: subframe =Offsetmod 10;

[0330] Otherwise (else): subframe = Offset or (Offset + 5);

[0331] T= CELI(Periodicity / 10).

[0332] DMTC is a time interval (e.g., window) during which the discovery reference signal (DRX), defined for small cell enhancement in Release-12 for UE synchronization and channel estimation, can be transmitted because it is difficult to periodically transmit signals such as PSS / SSS / cell-specific reference signal (CRS) due to the characteristics of a cell operating as a secondary cell (SCell) in LTE-license assisted access (LTE-LAA). DRS is a control signal that includes PSS / SSS / CRS and is transmitted periodically every 40ms. SMTC is a time interval in which measurement resources for RRM measurement can be configured in NR. Since there is no reference signal that is always transmitted in NR, unlike LTE's CRS, the UE can perform RRM measurement through the SSS and PBCH-DMRS of the SS / PBCH block that can be transmitted within SMTC, and the CSI-RS configured within the active BWP. Through the settings related to SMTC, the SMTC window duration, periodicity, and timing offset can be configured, and multiple periods can be configured as SMTC1 and SMTC2.

[0333] The RRC setting measObjectNR specifies information applicable to SS / PBCH block(s) intra / inter-frequency measurements and / or CSI-RS intra / inter-frequency measurements. If a cell DTX / DRX setting is configured for a cell to which the UE is configured to perform measurements, signals / channels such as SSB or CSI-RS may be configured / instructed not to be transmitted during the inactive period of that cell; therefore, the SMTC or measObjectNR must also be configured or the UE behavior must be varied considering the active / inactive period of the cell DTX / DRX setting. In some implementations of this specification, the BS may configure the SMTC or measObjectNR separately for the active and inactive periods of the cell DTX / DRX setting, respectively, or a single SMTC / measObjectNR may be provided for the cell DTX / DRX setting, but the period, etc., may be configured differently depending on the active and inactive periods. For example, when measurement settings are configured for neighbor cells, BS may consider the settings for neighbor cells and the active / inactive intervals of the activated cell DTX / DRX settings, and 1) provide a separate list of cells with and without cell DTX / DRX settings configured and activated, and a list of cells without and without configured / inactive settings, so that measurements for the list of cells where cell DTX / DRX settings are not in operation are configured and UE operations are performed in the same way as before. 2) For the list of cells where cell DTX / DRX settings are configured and activated and are in operation, two SMTCs (information on cell DTX / DRX settings and) may be configured instead of one, one to be applied to the active interval of the cell DTX / DRX settings and the other to the inactive interval. Alternatively, 3) only one SMTC may be provided as before, and the UE may be configured / defined to perform measurement / averaging only in the active interval, and not to perform measurement / averaging in the inactive interval.Additionally, since multiple cell DTX / DRX settings can be configured for a single cell, in some implementations of this specification, different SMTC or measObjectNR may be configured for each cell DTX / DRX setting.

[0334] <Method #5> Initial PUCCH transmission method considering the active / inactive periods of cell DTX / DRX settings

[0335] When a UE triggers a random access process (also called a RACH process) by starting the transmission of Msg1 (e.g., PRACH, or MsgA PRACH / PUSCH in the case of a 2-step RACH) to attempt to access a cell, it subsequently receives Msg2 RAR PDCCH / PDSCH from the BS in response to Msg1, transmits Msg3 PUSCH, and receives Msg4 in response to Msg3. At this time, as a response that it has successfully received Msg4 (MsgB in the case of a 2-step RACH) transmitted by the BS, the UE may transmit an initial PUCCH (e.g., HARQ-ACK through the initial PUCCH) using the initial PUCCH resource configured through the remaining system information (RMSI) (e.g., a PUCCH resource within the set of PUCCH resources specifically configured via the parameter pucch-ResourceCommon in the SIB). However, if the cell DTX / DRX setting is configured and enabled for the cell to which the UE attempts a random connection, the transmission of PUCCH during the cell DRX non-active period may also be configured / defined so as not to be allowed. In this case, the UE may be pre-configured or defined in standard documents, etc., to not transmit the instructed initial PUCCH during the cell DRX setting's non-active period, but to defer transmission until the next active period, and then transmit PUCCH when the active period begins. Alternatively, when the UE applies the instructed HARQ timing via Msg4 PDCCH (or via MsgB in the case of 2-stage RACH), it is also possible to apply the HARQ timing using the start time of the cell DRX active period as a reference point.

[0336] Meanwhile, in some implementations, if the timing for the UE to transmit the initial PUCCH overlaps with the cell DRX inactive period, the BS may consider that the UE did not transmit the PUCCH because it failed to successfully receive Msg4, but rather because the transmission of the initial PUCCH was not allowed during the cell DRX inactive period, and may attempt to receive the PUCCH again during the active period. Meanwhile, in some implementations, information regarding the cell DTX / DRX configuration and operation status for the cell (e.g., cell DTX / DRX configuration and information regarding whether said cell DTX / DRX configuration is enabled or disabled in the cell) may be provided to a UE connecting to the cell for the first time through a predefined specific SSB pattern / payload within the PBCH / SIB1 PDCCH / PDSCH, etc.

[0337] The methods or implementations of the aforementioned specification may be applied independently, but may also be applied in the form of a combination (or merger) of some proposed methods. Information regarding the application of the methods / implements of the aforementioned specification (or information regarding the rules of the methods / implements of the aforementioned specification) may be provided by the BS to the UE via a predefined signal (e.g., a physical layer signal or an upper layer signal). In the aforementioned specification, the upper layer may include one or more of functional layers such as MAC, RLC, PDCP, RRC, SDAP, etc.

[0338] According to some implementations of this specification, when the cell DTX / DRX setting is configured and enabled, the timings of common signals / channels for active and inactive periods can be set differently. According to some implementations of this specification, since the types of common signals / channels with different cycles in active and inactive periods can vary depending on the cell DTX / DRX setting, the degree of energy saving for the UE and BS can be flexibly adjusted according to the situation. According to some implementations of this specification, opportunities for energy saving gains for the BS can be provided while minimizing performance degradation of the UEs within the cell.

[0339] FIG. 17 illustrates the flow of signal transmission / reception in a UE according to some implementations of the present specification.

[0340] A UE may perform operations according to some implementations of this specification in relation to the transmission of an arbitrary access preamble. The UE may include at least one transceiver; at least one processor; and at least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations according to some implementations of this specification. A processing device for a UE may include at least one processor; and at least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations according to some implementations of this specification. A computer-readable (non-transient) storage medium may store at least one computer program including instructions that, when executed by said at least one processor, cause said at least one processor to perform operations according to some implementations of this specification. A computer program or computer program product is written on at least one computer-readable (non-transient) storage medium and may include instructions that, when executed, cause (at least one processor) to perform operations according to some implementations of this specification.

[0341] In a method performed by the above UE, or in the above UE, the processing device, the computer-readable (non-transient) storage medium, and / or the computer program product, the operations are: receiving a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell (S1701), the plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; based on the fact that the UE is in the first RRC state, monitoring a first type downlink (DL) signal in a first period during the active period of the first DTX setting and monitoring the first type DL signal in a second period during the non-active period of the first DTX setting (S1703); And based on the fact that the UE is in the second RRC state, it may include monitoring the second type DL signal in a third period during the active period of the second DTX setting, and monitoring the second type DL signal in a fourth period during the non-active period of the second DTX setting (S1703).

[0342] FIG. 18 illustrates the flow of signal transmission / reception in a BS according to some implementations of the present specification.

[0343] A BS may perform operations according to some implementations of this specification in relation to receiving an arbitrary access preamble. A BS may include at least one transceiver; at least one processor; and at least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations according to some implementations of this specification. A processing device for a BS may include at least one processor; and at least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations according to some implementations of this specification. A computer-readable (non-transient) storage medium may store at least one computer program including instructions that, when executed by said at least one processor, cause said at least one processor to perform operations according to some implementations of this specification. A computer program or computer program product is written on at least one computer-readable (non-transient) storage medium and may include instructions that, when executed, cause (at least one processor) to perform operations according to some implementations of this specification.

[0344] In a method performed by the above BS, or in the above BS, the processing device, the computer-readable (non-transient) storage medium, and / or the computer program product, the operations are: transmitting a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell (S1801), wherein the plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; and, based on the user equipment (UE) being in the first RRC state, transmitting a first type downlink (DL) signal on the cell in a first period during the active period of the first DTX setting, and transmitting the first type DL signal on the cell in a second period during the non-active period of the first DTX setting (S1803); And based on the fact that the UE is in the second RRC state, it may include transmitting a second type DL signal on the cell in a third period during the active period of the second DTX setting, and transmitting the second type DL signal on the cell in a fourth period during the non-active period of the second DTX setting (S1803).

[0345] In some implementations related to FIG. 17 or FIG. 18, the first cell DTX setting may include information regarding the active and inactive intervals of the first cell DTX setting, and the second cell DTX setting may include information regarding the active and inactive intervals of the second cell DTX setting.

[0346] In some implementations related to FIG. 17 or FIG. 18, the first cell DTX setting may include information regarding the first type DL signal, information regarding the first period, and information regarding the second period.

[0347] In some implementations related to FIG. 17 or FIG. 18, the second cell DTX setting may include information regarding the second type DL signal, information regarding the third period, and information regarding the fourth period.

[0348] In some implementations related to FIG. 17 or FIG. 18, the first type DL signal and the second type DL signal may be synchronization signal blocks.

[0349] In some implementations related to FIG. 17 or FIG. 18, the plurality of cell DTX / DRX settings may include a first cell DRX setting related to the first RRC state or a second DRX setting related to the second RRC state.

[0350] In some implementations related to FIG. 17 or FIG. 18, the first cell DRX setting or the second DRX setting may include information regarding physical random access channel (PRACH) mask index values ​​for the non-active period of the cell DRX setting.

[0351] In some implementations related to FIG. 17 or FIG. 18, the first cell DRX setting or the second DRX setting may include information regarding an uplink signal type associated with the cell DRX setting.

[0352] In some implementations related to FIG. 17 or FIG. 18, the first RRC state may be an RRC connected state, and the second RRC state may be a state that is not an RRC connected state.

[0353] As described above, the examples of this specification disclosed are provided to enable a person skilled in the art related to this specification to implement and practice this specification. Although the foregoing has been described by reference to the examples of this specification, a person skilled in the art may modify and change the examples of this specification in various ways. Accordingly, this specification is not intended to be limited to the examples described herein, but to be given the broadest possible scope consistent with the principles and novel features disclosed herein.

[0354] Implementations of this specification may be used in wireless communication systems, BS or user devices, and other equipment.

Claims

1. A method performed by user equipment (UE), Receiving a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, said plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the fact that the above UE is in the above first RRC state, the first type downlink (DL) signal is monitored in a first period during the active period of the first DTX setting, and the first type DL signal is monitored in a second period during the non-active period of the first DTX setting; and Based on the fact that the UE is in the second RRC state, the method includes monitoring the second type DL signal in a third period during the active period of the second DTX setting and monitoring the second type DL signal in a fourth period during the non-active period of the second DTX setting. The first cell DTX setting comprises information regarding the active and non-active intervals of the first cell DTX setting, information regarding the first type DL signal, information regarding the first period, and information regarding the second period. method.

2. In Paragraph 1, The second cell DTX setting comprises information regarding the active and non-active intervals of the second cell DTX setting, information regarding the second type DL signal, information regarding the third period, and information regarding the fourth period. method.

3. In Paragraph 1, The first type DL signal and the second type DL signal are synchronization signal blocks, method.

4. In Paragraph 1, The plurality of cell DTX / DRX settings include a first cell DRX setting associated with the first RRC state or a second DRX setting associated with the second RRC state, method.

5. In Paragraph 4, The first cell DRX setting or the second DRX setting includes information regarding a physical random access channel (PRACH) mask index value for a non-active period of the cell DRX setting, method.

6. In Paragraph 4, The first cell DRX setting or the second DRX setting includes information regarding an uplink signal type associated with the cell DRX setting, method.

7. In Paragraph 1, The first RRC state is an RRC connected state, and the second RRC state is a state that is not an RRC connected state. method.

8. At least one transmitter / receiver; At least one processor; and It includes at least one computer memory operablely connectable to the at least one processor and, when executed, stores instructions that cause the at least one processor to perform operations, wherein the operations are: Receiving a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, said plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the user equipment (UE) being in the first RRC state, a first type downlink (DL) signal is monitored in a first period during the active period of the first DTX setting, and the first type DL signal is monitored in a second period during the non-active period of the first DTX setting; and Based on the fact that the UE is in the second RRC state, the method includes monitoring the second type DL signal in a third period during the active period of the second DTX setting and monitoring the second type DL signal in a fourth period during the non-active period of the second DTX setting. The first cell DTX setting comprises information regarding the active and non-active intervals of the first cell DTX setting, information regarding the first type DL signal, information regarding the first period, and information regarding the second period. including, User device.

9. At least one processor; and It includes at least one computer memory operablely connectable to the at least one processor and, when executed, stores instructions that cause the at least one processor to perform operations, wherein the operations are: Receiving a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, said plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the user equipment (UE) being in the first RRC state, a first type downlink (DL) signal is monitored in a first period during the active period of the first DTX setting, and the first type DL signal is monitored in a second period during the non-active period of the first DTX setting; and Based on the fact that the UE is in the second RRC state, the method includes monitoring the second type DL signal in a third period during the active period of the second DTX setting and monitoring the second type DL signal in a fourth period during the non-active period of the second DTX setting. The first cell DTX setting comprises information regarding the active and non-active intervals of the first cell DTX setting, information regarding the first type DL signal, information regarding the first period, and information regarding the second period. Processing unit.

10. In a computer-readable non-transitory storage medium, The above storage medium stores at least one program code including instructions that cause at least one processor to perform operations when executed, and said operations are: Receiving a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, said plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the user equipment (UE) being in the first RRC state, a first type downlink (DL) signal is monitored in a first period during the active period of the first DTX setting, and the first type DL signal is monitored in a second period during the non-active period of the first DTX setting; and Based on the fact that the UE is in the second RRC state, the method includes monitoring the second type DL signal in a third period during the active period of the second DTX setting and monitoring the second type DL signal in a fourth period during the non-active period of the second DTX setting. The first cell DTX setting comprises information regarding the active and non-active intervals of the first cell DTX setting, information regarding the first type DL signal, information regarding the first period, and information regarding the second period. Storage medium.

11. In a method performed by a base station, Transmitting a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, wherein the plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the user equipment (UE) being in the first RRC state, a first type downlink (DL) signal is transmitted on the cell in a first period during the active period of the first DTX setting, and the first type DL signal is transmitted on the cell in a second period during the non-active period of the first DTX setting; and Based on the fact that the UE is in the second RRC state, the method includes transmitting a second type DL signal on the cell in a third period during the active period of the second DTX setting, and transmitting the second type DL signal on the cell in a fourth period during the non-active period of the second DTX setting. The first cell DTX setting comprises information regarding the active and non-active intervals of the first cell DTX setting, information regarding the first type DL signal, information regarding the first period, and information regarding the second period. method.

12. In Paragraph 11, The second cell DTX setting comprises information regarding the active and non-active intervals of the second cell DTX setting, information regarding the second type DL signal, information regarding the third period, and information regarding the fourth period. method.

13. In Paragraph 11, The first type DL signal and the second type DL signal are synchronization signal blocks, method.

14. In Paragraph 11, The plurality of cell DTX / DRX settings include a first cell DRX setting associated with the first RRC state or a second DRX setting associated with the second RRC state, method.

15. In Paragraph 14, The first cell DRX setting or the second DRX setting includes information regarding a physical random access channel (PRACH) mask index value for a non-active period of the cell DRX setting, method.

16. In Paragraph 14, The first cell DRX setting or the second DRX setting includes information regarding an uplink signal type associated with the cell DRX setting, method.

17. In Paragraph 11, The first RRC state is an RRC connected state, and the second RRC state is a state that is not an RRC connected state. method.

18. At least one transmitter / receiver; At least one processor; and It includes at least one computer memory operablely connectable to the at least one processor and, when executed, stores instructions that cause the at least one processor to perform operations, wherein the operations are: Transmitting a plurality of cell discontinuous transmission (DTX) / discontinuous reception (DRX) settings for a cell, wherein the plurality of cell DTX / DRX settings include a first DTX setting associated with a first radio resource control (RRC) state and a second DTX setting associated with a second RRC state; Based on the user equipment (UE) being in the first RRC state, a first type downlink (DL) signal is transmitted on the cell in a first period during the active period of the first DTX setting, and the first type DL signal is transmitted on the cell in a second period during the non-active period of the first DTX setting; and Based on the fact that the UE is in the second RRC state, the method includes transmitting a second type DL signal on the cell in a third period during the active period of the second DTX setting, and transmitting the second type DL signal on the cell in a fourth period during the non-active period of the second DTX setting. The first cell DTX setting comprises information regarding the active and non-active intervals of the first cell DTX setting, information regarding the first type DL signal, information regarding the first period, and information regarding the second period. Base station.

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