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

Abstract

A UE includes: detecting, in a cell, a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); acquiring, from the SSB, information relating to whether a system information block 1 (SIB1) is on-demand system information (SI); sending an SIB1 request on the basis that the SIB1 is on-demand SI; monitoring a physical downlink control channel (PDCCH) associated with the SIB1 based on the SIB1 request; and receiving a physical downlink shared channel (PDSCH) for carrying the SIB1 on the basis of the detected PDCCH.

Description

Technical Field

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

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

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

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

[0005] Technical issues

[0006] An object of the present disclosure is to provide a method and / or process for a Base Station (BS) to transmit a common signal / channel.

[0007] Another object of the present disclosure is to provide a method and / or process for a BS to operate by performing transmission / reception of a specific signal / channel based on detection of an uplink (UL) wake-up signal (WUS) for network energy saving (NES) purposes.

[0008] Another object of the present disclosure is to provide a method and / or process for secondary cell (SCell) activation of a user equipment (UE).

[0009] Another object of the present disclosure is to provide a method and / or process for compensating load-based cell activation.

[0010] Another object of the present disclosure is to provide a method and / or process for UE to adjust the power of UL WUS.

[0011] The objects to be achieved by using the present disclosure are not limited to those specifically described above, and other objects not described herein will be more clearly understood by those skilled in the art from the following detailed description.

[0012] Technical Solution

[0013] In one aspect of the present disclosure, a method for receiving a downlink signal by a user equipment (UE) in a wireless communication system is provided herein. The method comprises the following steps: detecting a synchronization signal block (SSB) on a cell, wherein the SSB comprises a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH); obtaining information from the SSB as to whether the system information block 1 (SIB1) is on-demand system information (SI); based on the fact that SIB1 is on-demand SI, sending a SIB1 request; based on the SIB1 request, monitoring a physical downlink control channel (PDCCH) related to SIB1; and based on the detection of the PDCCH, receiving a physical downlink shared channel (PDSCH) carrying SIB1.

[0014] In another aspect of the present disclosure, a UE configured to receive a downlink signal in a wireless communication system is provided herein. The UE includes: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which, when executed, cause the at least one processor to perform operations. The operations include: detecting SSBs on a cell, wherein the SSBs include PSS, SSS, and PBCH; obtaining information from the SSBs about whether SIB1 is SI on demand; based on SIB1 being SI on demand, sending a SIB1 request; based on the SIB1 request, monitoring a PDCCH related to SIB1; and based on detecting the PDCCH, receiving a PDSCH carrying SIB1.

[0015] In another aspect of the present disclosure, a processing device is provided herein. The processing device includes: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which, when executed, cause the at least one processor to perform operations. The operations include: detecting SSB on a cell, wherein the SSB includes PSS, SSS, and PBCH; obtaining information from the SSB about whether SIB1 is on-demand SI; based on SIB1 being on-demand SI, sending a SIB1 request; based on the SIB1 request, monitoring a PDCCH related to SIB1; and based on detecting the PDCCH, receiving a PDSCH carrying SIB1.

[0016] In another aspect of the present disclosure, a computer-readable storage medium is provided herein, which is configured to store at least one program including instructions, which, when executed by at least one processor, causes the at least one processor to perform operations for a UE. The operations include: detecting SSB on a cell, wherein the SSB includes PSS, SSS, and PBCH; obtaining information from the SSB about whether SIB1 is SI on demand; based on SIB1 being SI on demand, sending a SIB1 request; based on the SIB1 request, monitoring a PDCCH related to SIB1; and based on detecting the PDCCH, receiving a PDSCH carrying SIB1.

[0017] In another aspect of the present disclosure, a computer program stored on a computer-readable storage medium is provided herein. The computer program includes at least one program code, which includes instructions, and when the instructions are executed, at least one processor performs operations. The operations include: detecting SSB on a cell, wherein the SSB includes PSS, SSS, and PBCH; obtaining information from the SSB about whether SIB1 is on-demand SI; based on SIB1 being on-demand SI, sending a SIB1 request; based on the SIB1 request, monitoring PDCCH related to SIB1; and based on detecting the PDCCH, receiving a PDSCH carrying SIB1.

[0018] In another aspect of the present disclosure, a method for transmitting a downlink signal from a base station (BS) to a UE in a wireless communication system is provided herein. The method comprises the following steps: transmitting an SSB on a cell, wherein the SSB comprises a PSS, an SSS and a PBCH, and wherein the SSB comprises information about whether SIB1 is SI on demand; based on SIB1 being SI on demand, receiving a SIB1 request; based on the SIB1 request, transmitting a PDCCH related to SIB1; and transmitting a PDSCH carrying SIB1.

[0019] In another aspect of the present disclosure, a BS configured to send a downlink signal to a UE in a wireless communication system is provided herein. The BS includes: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, and the instructions, when executed, cause the at least one processor to perform operations. The operations include: sending an SSB on a cell, wherein the SSB includes a PSS, an SSS, and a PBCH, and wherein the SSB includes information about whether SIB1 is on-demand SI; based on SIB1 being on-demand SI, receiving a SIB1 request; based on the SIB1 request, sending a PDCCH related to SIB1; and sending a PDSCH carrying SIB1.

[0020] In various aspects of the present disclosure, information on whether SIB1 is on-demand SI may be obtained based on at least one of a specific bit in the PBCH, a demodulation reference signal (DMRS) sequence for the PBCH, or a synchronization signal sequence.

[0021] In various aspects of the present disclosure, information on whether SIB1 is on-demand SI may be obtained based on a SIB1-related PDCCH configuration field in a master information block (MIB) carried by a PBCH.

[0022] In various aspects of the present disclosure, the method or operation may include: determining whether SIB1 is on-demand SI based on that the SIB1-related PDCCH configuration field has a predetermined value; and sending a SIB1 request based on determining that SIB1 is on-demand SI.

[0023] In various aspects of the present disclosure, information on whether SIB1 is on-demand SI may be obtained based on the SSB subcarrier offset field in the MIB carried by the PBCH.

[0024] In various aspects of the present disclosure, the method or operation may include: determining whether SIB1 is on-demand SI based on the SSB subcarrier offset field in the MIB having a predetermined value; and sending a SIB1 request based on determining that SIB1 is on-demand SI.

[0025] In various aspects of the present disclosure, sending the SIB1 request may include sending a random access channel (RACH) related to the SSB, and the SIB1 may be related to a predetermined SSB index corresponding to the RACH.

[0026] In various aspects of the present disclosure, sending a SIB1 request may include sending a RACH related to an SSB, and the SIB1 may be related to all transmitted SSB indices.

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

[0028] Beneficial Effects

[0029] According to an embodiment of the present disclosure, a method and / or process for energy saving of a base station (BS) and a user equipment (UE) may be provided.

[0030] According to an embodiment of the present disclosure, a method and / or process for a BS to transmit a common signal / channel may be provided.

[0031] According to an embodiment of the present disclosure, a method and / or process of a BS operating by performing transmission / reception of a specific signal / channel based on detection of an uplink (UL) wake-up signal (WUS) for network energy saving (NES) purposes may be provided.

[0032] According to an embodiment of the present disclosure, a method and / or process for enabling a secondary cell (SCell) of a UE may be provided.

[0033] According to an embodiment of the present disclosure, a method and / or process for compensating for load-based cell activation may be provided.

[0034] According to an embodiment of the present disclosure, a method and / or process for a UE to adjust the power of a UL WUS may be provided.

[0035] According to implementations of the present disclosure, power consumption of a BS and a UE may be reduced.

[0036] Effects according to the present disclosure are not limited to those specifically described above, and other effects not described herein will be more clearly understood by those skilled in the art to which the present disclosure relates from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown.

[0038] Figure 2 is a block diagram illustrating an example of a communication device capable of executing the method according to the present disclosure.

[0039] Figure 3 Another example of a wireless device capable of performing implementations of the present disclosure is shown.

[0040] Figure 4 An example of a frame structure available in a wireless communication system such as a 3rd Generation Partnership Project (3GPP)-based wireless communication system is shown.

[0041] Figure 5 A resource grid showing time slots.

[0042] Figure 6 An example of physical channels used in a 3GPP-based communication system and a signal transmission / reception process using these channels is shown.

[0043] Figure 7 The system information (SI) acquisition process is shown.

[0044] Figure 8 A random access procedure suitable for implementation of the present disclosure is shown.

[0045] Fig. 9 The multiplexing pattern of synchronization signal blocks (SSBs) and control resource sets (CORESETs) is shown.

[0046] Fig.10 Discontinuous reception (DRX) operation suitable for implementations of the present disclosure is shown.

[0047] Fig.11 The case where a long DRX cycle and a short DRX cycle are configured is shown.

[0048] Fig.12 Transmission of system information block 1 (SIB1) in a 3GPP based system is shown.

[0049] Fig.13 A DL channel reception process in a UE according to some implementations of the present disclosure is shown.

[0050] Fig.14 A DL channel transmission process in a BS according to some implementations of the present disclosure is shown. DETAILED DESCRIPTION

[0051] Hereinafter, implementations according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to illustrate exemplary implementations of the present disclosure, rather than to show the only implementations that can be implemented according to the present disclosure. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure can be practiced without these specific details.

[0052] In some cases, known structures and devices may be omitted or may be shown in block diagram form, thereby focusing on important features of the structures and devices so as not to obscure the concepts of the present disclosure. The same reference numerals will be used throughout the present disclosure to refer to the same or similar parts.

[0053] The following techniques, devices and systems can be applied to various wireless multiple access systems. For example, multiple access systems may include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Enhanced Data Rate GSM Evolution (EDGE), etc. OFDMA can be specifically implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS), and 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA. 3GPP LTE adopts OFDMA on the downlink (DL) and SC-FDMA on the uplink (UL). LTE-advanced (LTE-A) is an evolved version of 3GPP LTE, and 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0054] For the convenience of description, the description will be given under the assumption that the present disclosure is applied to LTE and / or new RAT (NR). However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP LTE / NR system, the mobile communication system is applicable to any other mobile communication system except for matters specific to the 3GPP LTE / NR system.

[0055] For terms and techniques not described in detail among the terms and techniques used in the present disclosure, reference may be made to standard specifications based on 3GPP (for example, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.321, 3GPP TS 38.331, etc.).

[0056] In an example of the present disclosure described later, if a device "assumes" something, this may mean that a channel transmission entity transmits a channel in accordance with the corresponding "assumption". This may also mean that a channel reception entity receives or decodes a channel in a form that conforms to the "assumption" under the premise that the channel is transmitted in accordance with the "assumption".

[0057] In the present disclosure, a user equipment (UE) may be fixed or mobile. Each of the various devices that transmit and / or receive user data and / or control information by communicating with a base station (BS) may be a UE. The term UE may be referred to as a terminal device, a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), a wireless modem, a handheld device, etc. In the present disclosure, a BS refers to a fixed station that communicates with a UE and / or another BS and exchanges data and control information with the UE and another BS. The term BS may be referred to as an advanced base station (ABS), a node B (NB), an evolved node B (eNB), a base transceiver system (BTS), an access point (AP), a processing server (PS), etc. Specifically, a BS of a universal terrestrial radio access (UTRAN) is referred to as an NB, a BS of an evolved UTRAN (E-UTRAN) is referred to as an eNB, and a BS of a new radio access technology network is referred to as a gNB. In the following, for the convenience of description, NB, eNB or gNB will be referred to as a BS regardless of the type or version of the communication technology.

[0058] In the present disclosure, a node refers to a fixed point that can send / receive a radio signal to / from a UE by communicating with the UE. Regardless of its name, various types of BSs can be used as nodes. For example, a BS, NB, eNB, picocell eNB (PeNB), home eNB (HeNB), repeater, transponder, etc. can be a node. In addition, a node may not be a BS. For example, a radio remote head (RRH) or a radio remote unit (RRU) can be a node. Typically, RRH and RRU have a power level lower than that of the BS. Since the RRH or RRU (hereinafter, RRH / RRU) is usually connected to the BS via a dedicated line such as an optical cable, the collaborative communication according to the RRH / RRU and the BS can be smoothly performed compared to the collaborative communication according to the BS connected via a wireless link. At least one antenna is installed per node. The antenna may refer to a physical antenna port or to a virtual antenna or an antenna group. A node may also be referred to as a point.

[0059] In the present disclosure, a cell refers to a specific geographical area where one or more nodes provide communication services. Therefore, in the present disclosure, communication with a specific cell may mean communication with a BS or node that provides communication services to a specific cell. The DL / UL signal of a specific cell refers to the DL / UL signal from / to the BS or node that provides communication services to the specific cell. A cell that provides UL / DL communication services to a UE is particularly referred to as a service cell. In addition, the channel state / quality of a specific cell refers to the channel state / quality of a channel or communication link generated between a BS or node that provides communication services to a specific cell and the UE. In a 3GPP-based communication system, a UE can use a CRS sent on a cell-specific reference signal (CRS) resource and / or a CSI-RS sent on a channel state information reference signal (CSI-RS) resource (allocated to a specific node by an antenna port of a specific node) to measure the DL channel state from a specific node.

[0060] The 3GPP-based communication system uses the concept of a cell in order to manage radio resources, and distinguishes a cell related to radio resources from a cell of a geographical area.

[0061] A "cell" of a geographic area may be understood as a coverage area in which a node can use a carrier to provide services, and a "cell" of radio resources is associated with a bandwidth (BW) which is a frequency range configured by a carrier. Since the DL coverage (the range in which a node can send a valid signal) and the UL coverage (the range in which a node can receive a valid signal from a UE) depend on the carrier that carries the signal, the coverage of a node may also be associated with the coverage of a "cell" of radio resources used by the node. Therefore, the term "cell" may be used to indicate the service coverage of a node at times, to indicate a radio resource at other times, or to indicate a range that a signal using a radio resource can reach with effective strength at other times.

[0062] In the 3GPP communication standard, the concept of a cell is used to manage radio resources. A "cell" associated with a radio resource is defined by a combination of DL resources and UL resources (i.e., a combination of DL component carriers (CCs) and UL CCs). A cell may be configured only by DL resources, or by a combination of DL resources and UL resources. If carrier aggregation is supported, the link between the carrier frequency of a DL resource (or DL ​​CC) and the carrier frequency of a UL resource (or UL CC) may be indicated by system information. For example, the combination of DL resources and UL resources may be indicated by a system information block type 2 (SIB2) link. In this case, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When carrier aggregation (CA) is configured, the UE has only one radio resource control (RRC) connection with the network. During RRC connection establishment / reestablishment / handover, one serving cell provides non-access layer (NAS) mobility information. During RRC connection reestablishment / handover, one serving cell provides security input. The cell is called a primary cell (Pcell). Pcell refers to a cell operating on the primary frequency where the UE performs an initial connection establishment process or initiates a connection reestablishment process. According to the UE capabilities, the secondary cell (Scell) can be configured to form a set of serving cells together with the Pcell. The Scell ​​can be configured after the RRC connection establishment is completed and is used to provide additional radio resources in addition to the resources of the specific cell (SpCell). The carrier corresponding to the Pcell on the DL is called the downlink primary CC (DL PCC), and the carrier corresponding to the Pcell on the UL is called the uplink primary CC (UL PCC). The carrier corresponding to the Scell ​​on the DL is called the downlink secondary CC (DL SCC), and the carrier corresponding to the Scell ​​on the UL is called the uplink secondary CC (UL SCC).

[0063] For dual connectivity (DC) operation, the term primary SCG cell (PSCell) refers to the secondary cell group (SCG) cell to which the UE performs random access when performing RRC reconfiguration and synchronization processes.

[0064] In dual connectivity (DC) operation, the term special cell (SpCell) refers to the Pcell of the main cell group (MCG) or the Pcell of the secondary cell group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always enabled. MCG is a group of service cells associated with a master node (e.g., BS) and includes SpCell (Pcell) and optionally one or more Scells. For a UE configured with DC, SCG is a subset of the service cells associated with the secondary node and includes PSCell and 0 or more Scells. For a UE in RRC_CONNECTED state that is not configured with CA or DC, there is only one service cell that includes only Pcell. For a UE in RRC_CONNECTED state that is configured with CA or DC, the term service cell refers to a set of cells including SpCell and all Scells. In DC, two medium access control (MAC) entities are configured for the UE, i.e., one MAC entity for MCG and one MAC entity for SCG.

[0065] For a UE configured with CA but not with DC, a PcellPUCCH group including a Pcell and 0 or more Scells and a Scell ​​PUCCH group including only Scells may be configured. In the case of an Scell, an Scell ​​of a PUCCH related to a corresponding cell (hereinafter referred to as a PUCCH cell) may be configured. An Scell ​​indicating a PUCCH Scell ​​belongs to a Scell ​​PUCCH group and performs PUCCH transmission of related UCI on the PUCCH Scell, an Scell ​​not indicating a PUCCH Scell ​​or indicating a Pcell as a cell for PUCCH transmission belongs to a Pcell PUCCH group and performs PUCCH transmission of related UCI on the PUCCH Scell.

[0066] In a wireless communication system, a UE receives information from a BS on DL, and a UE transmits information to a BS on UL. The information transmitted and / or received by the BS and the UE includes data and various control information, and there are various physical channels according to the type / purpose of the information transmitted and / or received by the UE and the BS.

[0067] The communication standards based on 3GPP define DL physical channels corresponding to resource elements carrying information from high layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information from high layers. For example, physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), physical multicast channel (PMCH), physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), etc. are defined as DL physical channels, and reference signals (RS) and synchronization signals are defined as DL physical signals. RS (also called pilot) represents a signal with a predefined special waveform known to both BS and UE. For example, demodulation reference signal (DMRS), channel state information RS (CSI-RS), positioning reference signal (PRS), etc. are defined as DL RS. The communication standards based on 3GPP define UL physical channels corresponding to resource elements carrying information from high layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information from high layers. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are defined as UL physical channels, and a DMRS for UL control / data signals, a sounding reference signal (SRS) for UL channel measurement, etc. are defined.

[0068] In the present disclosure, PDCCH refers to a set of time-frequency resources (e.g., resource elements (REs)) carrying downlink control information (DCI), and PDSCH refers to a set of time-frequency resources carrying DL data. PUCCH, PUSCH, and PRACH refer to a set of time-frequency resources carrying UCI, a set of time-frequency resources carrying UL data, and a set of time-frequency resources carrying random access signals, respectively. In the following description, "UE sends / receives PUSCH / PUCCH / PRACH" is used as the same meaning as the UE sends / receives UCI / UL data / random access signals on or through PUCCH / PUSCH / PRACH, respectively. In addition, "BS sends / receives PBCH / PDCCH / PDSCH" is used as the same meaning as the BS sends broadcast information / DL data / DL control information on or through PBCH / PDCCH / PDSCH, respectively.

[0069] As more and more communication devices require greater communication capacity, eMBB communication relative to traditional radio access technology (RAT) is needed. In addition, large-scale MTC, which provides various services anytime and anywhere by connecting multiple devices and objects to each other, is a major issue to be considered in the next generation of communications. In addition, the design of communication systems that take into account services / UEs that are sensitive to reliability and delay is also being discussed. Considering eMBB communication, large-scale MTC, ultra-reliable low-latency communication (URLLC), etc., the introduction of the next generation RAT is being discussed. Currently, in 3GPP, research on the next generation mobile communication system after EPC is underway. In this disclosure, for convenience, the corresponding technology is referred to as a new RAT (NR) or a fifth generation (5G) RAT, and a system using NR or supporting NR is referred to as an NR system.

[0070] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown.

[0071] Reference Figure 1 , the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, the wireless device refers to a device that performs communication using a RAT (e.g., 5G NR or LTE (e.g., E-UTRA)), and may be referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, BSs and networks may also be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to another wireless device.

[0072] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0073] Wireless communication / connection 150a and 150b may be established between wireless devices 100a to 100f and BS200, and between wireless devices 100a to 100f. Here, wireless communication / connection such as UL / DL communication 150a and sidelink communication 150b (or device-to-device (D2D) communication) may be established through various RATs (e.g., 5G NR). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of a resource allocation process may be performed based on various proposals of the present disclosure.

[0074] Figure 2 is a block diagram illustrating an example of a communication device capable of executing the method according to the present disclosure.

[0075] Reference Figure 2 , the first wireless device 100 and the second wireless device 200 may transmit and / or receive radio signals through various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 1 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0076] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the functions, processes and / or methods described / proposed above. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may execute part or all of the processes controlled by the processor 102 or store software codes including commands for executing the processes and / or methods described / proposed above. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0077] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the functions, processes and / or methods described / proposed above. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 may execute part or all of the processes controlled by the processor 202 or store software codes including commands for executing the processes and / or methods described / proposed above. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0078] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, an SDU, a message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure.

[0079] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The functions, processes, proposals, and / or methods disclosed in the present disclosure may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the functions, processes, proposals, and / or methods disclosed in the present disclosure may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The functions, processes, proposals, and / or methods disclosed in the present disclosure may be implemented using firmware or software in the form of code, commands, and / or command sets.

[0080] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, commands and / or instructions. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0081] One or more transceivers 106 and 206 may send the user data, control information and / or radio signal / channel mentioned in the method and / or operation flow chart of the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information and / or radio signal / channel mentioned in the function, process, proposal, method and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signal to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signal from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. One or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the functional, process, proposal, method and / or operation flow chart disclosed in the present disclosure through one or more antennas 108 and 208. In the present disclosure, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0082] Figure 3 Another example of a wireless device capable of performing implementations of the present disclosure is shown.

[0083] Reference Figure 3 , the wireless devices 100 and 200 may correspond to Figure 2 The wireless devices 100 and 200 of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 2One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Figure 2 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 may send information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0084] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 1 100a), vehicles ( Figure 1 100b-1 and 100b-2), XR devices ( Figure 1 100c), handheld device ( Figure 1 100d), household appliances ( Figure 1 100e), IoT devices ( Figure 1 100f), digital broadcast UE, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 1 400), BS( Figure 1 200), network nodes, etc. The wireless device can be used in a mobile or fixed location depending on the usage / service.

[0085] exist Figure 3In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM)), a flash memory, a volatile memory, a non-temporary memory and / or a combination thereof.

[0086] In the present disclosure, at least one memory (e.g., 104 or 204) may store instructions or programs, and these instructions or programs, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0087] In the present disclosure, a computer-readable storage medium may store at least one instruction or program, and when the at least one instruction or program is executed by at least one processor, the at least one processor may cause the at least one processor to perform operations according to some embodiments or implementations of the present disclosure.

[0088] In the present disclosure, a processing device or apparatus may include at least one processor and at least one computer memory operatively connected to the at least one processor. The at least one computer memory may store instructions or programs, and these instructions or programs, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0089] The communication device of the present disclosure includes: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and configured to store instructions, which when executed cause the at least one processor to perform operations according to examples of the present disclosure described later.

[0090] Figure 4 An example of a frame structure available in a wireless communication system such as a 3rd Generation Partnership Project (3GPP)-based wireless communication system is shown.

[0091] Figure 4 The frame structure is only exemplary, and the number of subframes, the number of time slots, and the number of symbols in the frame may be changed differently. In the NR system, different OFDM parameter sets (e.g., subcarrier spacing (SCS)) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of time resources including the same number of symbols (e.g., subframes, time slots, or transmission time intervals (TTIs)) may be configured differently for the aggregated cells. Here, the symbol may include an OFDM symbol (or a cyclic prefix-OFDM (CP-OFDM) symbol) and an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol). In the present disclosure, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols, and DFT-s-OFDM symbols may be used interchangeably.

[0092] Reference Figure 4 In the NR system, UL transmission and DL transmission are organized into frames. Each frame has T f =(△f max *N f / 100)*T c = 10 ms duration and is divided into two half frames of 5 ms each. The basic time unit of NR is T c =1 / (△f max *N f ), where △f max =480*10 3 Hz and N f =4096. For reference, the basic time unit of LTE is T s =1 / (△f ref *N f,ref ), where △f ref =15*10 3 Hz and N f,ref =2048. c and T f With constant κ = T c / T f =64. Each half frame includes 5 subframes, and the duration of a single subframe is T sf The subframe is further divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on the cyclic prefix. In normal CP, each slot includes 14 OFDM symbols, and in extended CP, each slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing △f=2 u *15kHz. The following table shows the number of OFDM symbols per time slot (N slot symb), the number of time slots per frame (N frame,u slot ) and the number of time slots per subframe (N subframe,u slot ).

[0093] [Table 1]

[0094] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32 6 14 640 64

[0095] The following table shows the subcarrier spacing △f = 2 u *15kHz, number of OFDM symbols per slot, number of slots per frame and number of slots per subframe.

[0096] [Table 2]

[0097] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 2 12 40 4

[0098] For subcarrier spacing configuration u, the time slots may be indexed in ascending order within a subframe as follows: n u s ∈{0,...,n subframe ,u slot -1}, and are indexed in ascending order within the frame as follows: n u s,f ∈{0,...,n frame,u slot -1}.

[0099] The NR band is defined as two frequency ranges, namely, FR1 and FR2. FR2 is also known as millimeter wave (mmW). The following table shows the frequency range in which NR can operate.

[0100] [Table 3]

[0101] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0102] Figure 5 A resource grid showing time slots.

[0103] A slot includes multiple (e.g., 14 or 12) symbols in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, a common resource block (CRB) N indicated by higher layer signaling (e.g., RRC signaling) is allocated. start,u grid Begins to define N size,u grid,x *N RB sc subcarriers and N subframe,u symb OFDM symbol resource grid, where N size,u grid,xis the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. N RB sc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission link (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u is given to the UE through higher-layer parameters (e.g., RRC parameters) size,u grid . Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing the symbol position relative to a reference point in the time domain. In the NR system, an RB is defined by 12 consecutive subcarriers in the frequency domain. In the NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For SCS configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 of subcarrier spacing configuration u is equal to "point A" used as a common reference point for the RB grid. PRBs are defined within a bandwidth part (BWP) and are numbered from 0 to N size BWP,i -1 numbering, where i is the number of BWPs. PRB n in BWP i PRB With CRB CRB The relationship between n PRB＝ n CRB+ N size BWP,i Given, where N size BWP,i is the CRB where the BWP starts relative to CRB 0. A BWP includes multiple consecutive RBs in the frequency domain. A carrier may include up to N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Data communication is performed through enabled BWPs, and only a predetermined number of BWPs (e.g., one BWP) among the BWPs configured for the UE may be active on the component carrier.

[0104] For each serving cell in the set of DL BWPs or UL BWPs, the network may configure at least an initial DL BWP and one (if the serving cell is configured with uplink) or two (if supplementary uplink is used) initial UL BWPs. The network may configure additional UL and DL BWPs. For each DL BWP or UL BWP, the following parameters may be provided to the UE for the serving cell: i) SCS; ii) CP; iii) start BWP＝275 indicates the offset RB set and length L RB CRB N provided as the RRC parameter locationAndBandwidth of the Resource Indicator Value (RIV) start BWP =O carrier +RB start and the number of adjacent RBs N size BWP =L RB , and the value O provided by the RRC parameter offsetToCarrier for SCS carrier ; an index into a set of DL BWP or UL BWP; a set of BWP common parameters; and a set of BWP dedicated parameters.

[0105] Virtual Resource Blocks (VRBs) can be defined within a BWP and are numbered from 0 to N. size,u BWP,i -1 index, where i represents the BWP number. VRBs may be mapped to PRBs according to an interleaved mapping or a non-interleaved mapping. In some implementations, for non-interleaved VRB to PRB mapping, VRB n may be mapped to PRB n.

[0106] Hereinafter, physical channels available in a 3GPP-based wireless communication system will be described in detail.

[0107] PDCCH carries DCI. For example, PDCCH (i.e., DCI) carries information about the transmission format and resource allocation of the downlink shared channel (DL-SCH), information about the resource allocation of the uplink shared channel (UL-SCH), paging information about the paging channel (PCH), system information about DL-SCH, resource allocation information of control messages of a layer higher than the physical layer (hereinafter, high layer) in the protocol stack of UE / BS (e.g., random access response (RAR) sent on PDSCH), transmission power control commands, information about the activation / deactivation of configuration scheduling (CS), etc. DCI including resource allocation information about DL-SCH is called PDSCH scheduling DCI, and DCI including resource allocation information about UL-SCH is called PUSCH scheduling DCI. DCI includes a cyclic redundancy check (CRC). The CRC is masked / scrambled with various identifiers (e.g., radio network temporary identifier (RNTI)) according to the owner and purpose of the PDCCH. For example, if the PDCCH is for a specific UE, the CRS is masked with a UE identifier (e.g., cell-RNTI (C-RNTI)). If the PDCCH is for a paging message, the CRC is masked with a paging RNTI (P-RNTI). If the PDCCH is for system information (e.g., system information block (SIB)), the CRC is masked with a system information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with a random access-RNTI (RA-RNTI).

[0108] When the PDCCH on one serving cell schedules the PDSCH or PUSCH on another serving cell, it is called cross-carrier scheduling. Cross-carrier scheduling with a carrier indicator field (CIF) allows the PDCCH on the serving cell to schedule resources on another serving cell. When the PDSCH on the serving cell schedules the PDSCH or PUSCH on the serving cell, it is called self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide information about the cell of the scheduling cell to the UE. For example, the BS may inform the UE whether the serving cell is scheduled by the PDCCH on another (scheduling) cell or by the serving cell. If the serving cell is scheduled by another (scheduling) cell, the BS may inform the UE which cell signals the DL assignment and UL grant of the serving cell. In the present disclosure, the cell carrying the PDCCH is referred to as the scheduling cell, and the cell whose transmission of the PUSCH or PDSCH is scheduled by the DCI included in the PDCCH (i.e., the cell carrying the PUSCH or PDSCH scheduled by the PDCCH) is referred to as the scheduled cell.

[0109] PDCCH is sent via a control resource set (CORESET). One or more CORESETs may be configured for a UE. CORESET is determined based on the following parameters.

[0110] -controlResourceSetId: ID of CORESET.

[0111] -frequencyDomainResources: Frequency domain resources of CORESET. The frequency domain resources of CORESET are indicated by a bitmap, and each bit corresponds to an RB group (six consecutive RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit with a bit value of 1 is allocated to the frequency domain resources of CORESET.

[0112] -duration: The time domain resource of CORESET. The time domain resource of CORESET indicates the number of consecutive OFDMA symbols constituting CORESET. For example, duration has a value of 1 to 3.

[0113] -cce-REG-MappingType: CCE to REG mapping type. Supports interleaved and non-interleaved types.

[0114] -precoderGranularity: Precoder granularity in the frequency domain.

[0115] -tci-StatesPDCCH: Information indicating the transmission configuration indication (TCI) state of the PDCCH (eg, TCI-StateID). The TCI state is used to provide a quasi-co-location (QCL) relationship (TCI-state) between DL RS and PDCCH DMRS ports within an RS set.

[0116] -tci-PresentInDCI: Whether the TCI field is included in the DCI.

[0117] -pdcch-DMRS-ScramblingID: information used to initialize the PDCCH DMRS scrambling sequence.

[0118] A CORESET may be defined and / or configured as a set of time-frequency resources in which a UE can monitor a PDCCH. A UE may be configured with one or more CORESETs. A CORESET has a duration of one to three OFDM symbols and includes a set of PRBs. The PRBs included in the CORESET and the CORESET duration may be provided to the UE via high-level (e.g., RRC) signaling. The UE may monitor a set of PDCCH candidates in the configured CORESET according to a corresponding search space set. In the present disclosure, monitoring means decoding (blind decoding) of each PDCCH candidate based on the monitored DCI format. The MIB on the PBCH provides the UE with parameters (e.g., CORESET#0 configuration) for monitoring the PDCCH that schedules the PDSCH carrying SIB1. The PBCH may indicate that there is no associated SIB1. In this case, the UE may be provided not only with a frequency range in which the UE is allowed to assume that there is no SSB associated with SSB1, but also with another frequency range in which the UE is allowed to discover SSBs associated with SIB1. As a CORESET for scheduling at least SIB1, CORESET#0 may be configured through MIB or dedicated RRC signaling.

[0119] The PDCCH candidate set monitored by the UE is defined according to the PDCCH search space set. The search space set can be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration. The search space set is determined based on the following parameters provided by the BS to the UE.

[0120] -serachSpaceId: SS set identifier that identifies the SS set.

[0121] -controlResourceSetId: Identifies the identifier of the CORESET associated with the search space.

[0122] -monitoringSlotPeriodicityAndOffset: configures the PDCCH monitoring periodicity and PDCCH monitoring offset of the timeslot used for PDCCH monitoring.

[0123] - duration: The number of consecutive slots that last in the search space at each occasion, ie at each period, is given by monitoringSlotPeriodicityAndOffset.

[0124] - monitoringSymbolsWithinSlot: PDCCH monitoring pattern within a slot, indicating the first symbol of the CORESET within the slot used for PDCCH monitoring.

[0125] -nrofCandidates: Number of PDCCH candidates per CCE aggregation level.

[0126] The UE monitors PDCCH candidates only during the PDCCH monitoring opportunities. The UE determines the PDCCH monitoring opportunities from the PDCCH monitoring periodicity, PDCCH monitoring offset and PDCCH monitoring pattern within the time slot. The parameter monitoringSymbolsWithinSlot may indicate the first symbol used for PDCCH monitoring in the time slot configured for PDCCH monitoring (e.g., see monitoringSlotPeriodicityAndOffset and duration). For example, when monitoringSymbolsWithinSlot is a 14-bit parameter, the most significant (leftmost) bit may represent the first OFDM symbol in the time slot, and the second most significant (leftmost) bit may represent the second OFDM symbol in the time slot. In this way, the bits of monitoringSymbolsWithinSlot may represent the 14 OFDM symbols of the time slot respectively. For example, the bit set to 1 among the bits in monitoringSymbolsWithinSlot may identify the first symbol of the CORESET in the time slot.

[0127] The following table shows the search space sets and their associated RNTIs along with usage examples.

[0128] [Table 4]

[0129]

[0130]

[0131] The following table shows the DCI format carried by PDCCH.

[0132] [Table 5]

[0133]

[0134] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG) (or CBG level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or CBG (or CBG level) PDSCH. For CSS, after the RRC initially gives the BWP size, DCI format 0_0 and DCI format 1_0 have a fixed size. For USS, the size of the fields other than the frequency domain resource assignment (FDRA) field of DCI format 0_0 and DCI format 1_0 is fixed, and the size of the FDRA field may vary according to the relevant parameter configuration of the BS. In DCI format 0_1 ​​and DCI format 1_1, the size of the DCI field may change according to various RRC reconfigurations of the BS. DCI format 2_0 can be used to transmit dynamic slot format information (e.g., SFIDCI) to the UE, and DCI format 2_1 can be used to transmit downlink preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be transmitted to UEs in the corresponding group via a group common PDCCH (a PDCCH transmitted to UEs defined as a group).

[0135] PDSCH is a physical layer UL channel for UL data transmission. PDSCH carries DL data (e.g., DL-SCH transport block) and is subjected to modulation such as quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM, 256QAM, etc. Codewords are generated by encoding transport blocks (TBs). PDSCH can carry up to two codewords. Scrambling and modulation mapping of each codeword can be performed, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to a radio resource together with DMRS and generated as an OFDM symbol signal. Then, the OFDM symbol signal is sent through the corresponding antenna port. PDSCH can be dynamically scheduled (dynamic scheduling) by PDCCH or semi-statically scheduled (configuration scheduling (CS)) based on high-level (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)). Therefore, in dynamic scheduling, PDSCH transmission accompanies PDCCH, but in CS, PDSCH transmission does not accompany PDCCH. CS includes Semi-Persistent Scheduling (SPS).

[0136] PUCCH is a physical layer UL channel used for uplink control information (UCI) transmission. PUCCH carries UCI. UCI includes the following information.

[0137] - Scheduling Request (SR): information used to request UL-SCH resources.

[0138] - Hybrid Automatic Repeat Request (HARQ) - Acknowledgement (ACK): A response to a DL data packet (e.g., a codeword) on the PDSCH. HARQ-ACK indicates whether the communication device successfully received the DL data packet. In response to a single codeword, a 1-bit HARQ-ACK may be sent. In response to two codewords, a 2-bit HARQ-ACK may be sent. HARQ-ACK responses include positive ACK (abbreviated as ACK), negative ACK (NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK may be used interchangeably with HARQ ACK / NACK, ACK / NACK, or A / N.

[0139] - Channel State Information (CSI): Feedback information about a DL channel. 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), and layer indicator (L1). According to the type of UCI included in the CSI, the CSI may be classified into CSI part 1 and CSI part 2. For example, the CRI, RI, and / or CQI of the first codeword may be included in CSI part 1, and the LI, PMI, and / or CQI of the second codeword may be included in CSI part 2.

[0140] In the present disclosure, for convenience, the PUCCH resources configured / indicated by the BS for / to the UE for HARQ-ACK, SR, and CSI transmission are respectively referred to as HARQ-ACK PUCCH resources, SR PUCCH resources, and CSI PUCCH resources.

[0141] According to the UCI payload size and / or transmission length (eg, the number of symbols included in the PUCCH resource), the PUCCH format may be defined as follows: For the PUCCH format, reference may also be made to Table 6.

[0142] (0) PUCCH format 0 (PF0 or F0)

[0143] - Supported UCI payload size: up to K bits (e.g., K=2)

[0144] -The number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

[0145] -Transmission structure: Only UCI signal without DMRS is included in PUCCH format 0. UE sends UCI status by selecting and sending one of multiple sequences. For example, UE sends specific UCI to BS by sending one of multiple sequences via PUCCH (PUCCH format 0). UE sends PUCCH (PUCCH format 0) in PUCCH resources for corresponding SR configuration only when sending positive SR.

[0146] - The configuration of PUCCH format 0 includes the following parameters corresponding to the PUCCH resource: the index of the initial cyclic shift, the number of symbols used for PUCCH transmission and / or the first symbol used for PUCCH transmission.

[0147] (1) PUCCH format 1 (PF1 or F1)

[0148] - Supported UCI payload size: up to K bits (e.g., K=2)

[0149] -The number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0150] -Transmission structure: DMRS and UCI are configured / mapped to different OFDM symbols by TDM. In other words, DMRS is transmitted in symbols where modulation symbols are not transmitted, and UCI is expressed as the product between a specific sequence (e.g., orthogonal cover code (OCC)) and a modulation (e.g., QPSK) symbol. Code division multiplexing (CDM) is supported between multiple PUCCH resources (compliant with PUCCH format 1) (within the same RB) by applying cyclic shift (CS) / OCC to both UCI and DMRS. PUCCH format 1 carries up to 2 bits of UCI, and modulation symbols are spread in the time domain by OCC (configured differently depending on whether frequency hopping is performed).

[0151] - The configuration of PUCCH format 1 includes the following parameters corresponding to the PUCCH resource: the index of the initial cyclic shift, the number of symbols used for PUCCH transmission, the first symbol used for PUCCH transmission and / or the index of the OCC.

[0152] (2) PUCCH format 2 (PF2 or F2)

[0153] - Supported UCI payload size: more than K bits (e.g., K=2)

[0154] -The number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

[0155] -Transmission structure: DMRS and UCI are configured / mapped using frequency division multiplexing (FDM) within the same symbol. The UE transmits UCI by applying IFFT without DFT to the coded UCI bits. PUCCH format 2 carries UCI of a larger bit size than K bits, and the modulation symbols are subjected to FDM with DMRS for transmission. For example, DMRS is located in symbol indexes #1, #4, #7, and #10 within a given RB with a density of 1 / 3. Pseudo-noise (PN) sequences are used for DMRS sequences. Frequency hopping can be enabled for 2-symbol PUCCH format 2.

[0156] - The configuration of PUCCH format 2 includes the following parameters corresponding to the PUCCH resources: the number of PRBs, the number of symbols used for PUCCH transmission and / or the first symbol used for PUCCH transmission.

[0157] (3) PUCCH format 3 (PF3 or F3)

[0158] - Supported UCI payload size: more than K bits (e.g., K=2)

[0159] -The number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0160] - Transmission structure: DMRS and UCI are configured / mapped to different OFDM symbols by TDM. UE transmits UCI by applying DFT to the coded UCI bits. PUCCH format 3 does not support UE multiplexing for the same time-frequency resource (eg, the same PRB).

[0161] - The configuration of PUCCH format 3 includes the following parameters corresponding to the PUCCH resources: the number of PRBs, the number of symbols used for PUCCH transmission and / or the first symbol used for PUCCH transmission.

[0162] (4) PUCCH format 4 (PF4 or F4)

[0163] - Supported UCI payload size: more than K bits (e.g., K=2)

[0164] -The number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0165] -Transmission structure: DMRS and UCI are configured / mapped to different OFDM symbols by TDM. By applying OCC in the front end of DFT and applying CS (or interleaved FDM (IFDM) mapping) to DMRS, PUCCH format 4 can multiplex up to 4 UEs in the same PRB. In other words, the modulation symbol of UCI is subjected to TDM with DMRS for transmission.

[0166] - The configuration of PUCCH format 4 includes the following parameters for the corresponding PUCCH resources: the number of symbols for PUCCH transmission, the length of OCC, the index of OCC, and the first symbol for PUCCH transmission.

[0167] The following table shows PUCCH formats. According to the PUCCH transmission length, PUCCH formats can be divided into short PUCCH formats (format 0 and 2) and long PUCCH formats (format 1, 3, and 4).

[0168] [Table 6]

[0169]

[0170] PUCCH resources can be determined according to the UCI type (e.g., A / N, SR, or CSI). The PUCCH resources for UCI transmission can be determined based on the UCI (payload) size. For example, the BS can configure multiple PUCCH resource sets for the UE, and the UE can select a specific PUCCH resource set corresponding to a specific range according to the range of the UCI (payload) size (e.g., the number of UCI bits). For example, the UE can select one of the following PUCCH resource sets according to the number of UCI bits N UCI from among the following PUCCH resource sets.

[0171] - PUCCH resource set #0, if the number of UCI bits = <2

[0172] - PUCCH resource set #1, if 2 < the number of UCI bits = <N1 ...

[0174] - PUCCH resource set #(K - 1), if N K-2 < the number of UCI bits = <N K-1

[0175] Here, K represents the number of PUCCH resource sets (K > 1), and N i represents the maximum number of UCI bits supported by PUCCH resource set #i. For example, PUCCH resource set #1 can include resources for PUCCH formats 0 to 1, and other PUCCH resource sets can include resources for PUCCH formats 2 to 4.

[0176] The configuration of each PUCCH resource includes the configuration of a PUCCH resource index, a starting PRB index, and one of PUCCH formats 0 to PUCCH formats 4. The BS configures the UE, through the high-level parameter maxCodeRate, the code rate for multiplexing HARQ-ACK, SR, and CSI reports within a PUCCH transmission using PUCCH format 2, PUCCH format 3, or PUCCH format 4. The high-level parameter maxCodeRate is used to determine how to feed back UCI on a PUCCH resource of PUCCH format 2, 3, or 4.

[0177] If the UCI type is SR and CSI, the PUCCH resources to be used for UCI transmission in the PUCCH resource set may be configured for the UE through high-layer signaling (e.g., RRC signaling). If the UCI type is HARQ-ACK for a semi-persistently scheduled (SPS) PDSCH, the PUCCH resources to be used for UCI transmission in the PUCCH resource set may be configured for the UE through high-layer signaling (e.g., RRC signaling). On the other hand, if the UCI type is HARQ-ACK for a PDSCH scheduled by DCI, the PUCCH resources to be used for UCI transmission in the PUCCH resource set may be scheduled by DCI.

[0178] In the case of DCI-based PUCCH resource scheduling, the BS may send DCI to the UE on the PDCCH and indicate the PUCCH resources to be used for UCI transmission in a specific PUCCH resource set through an ACK / NACK resource indicator (ARI) in the DCI. The ARI may be used to indicate the PUCCH resources used for ACK / NACK transmission and is also referred to as a PUCCH resource indicator (PRI). Here, the DCI may be used for PDSCH scheduling and the UCI may include HARQ-ACK for the PDSCH. The BS may configure a PUCCH resource set including a greater number of PUCCH resources than the state that the ARI can represent for the UE through (UE-specific) high-level (e.g., RRC) signaling. The ARI may indicate a PUCCH resource subset of the PUCCH resource set, and which PUCCH resource in the indicated PUCCH resource subset to be used may be determined according to an implicit rule based on transmission resource information about the PDCCH (e.g., the starting CCE index of the PDCCH).

[0179] For UL-SCH data transmission, the UE should include UL resources available to the UE, and for DL-SCH data reception, the UE should include DL resources available to the UE. The BS assigns UL resources and DL resources to the UE through resource allocation. Resource allocation may include time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA). In the present disclosure, UL resource allocation is also referred to as UL grant, and DL resource allocation is referred to as DL assignment. The UL grant is dynamically received by the UE on the PDCCH or in the RAR, or semi-persistently configured by the BS for the UE through RRC signaling. The DL assignment is dynamically received by the UE on the PDCCH, or semi-persistently configured by the BS for the UE through RRC signaling.

[0180] On the UL, the BS can dynamically allocate UL resources to the UE via a PDCCH addressed to a cell radio network temporary identifier (C-RNTI). The UE monitors the PDCCH to discover possible UL grants for UL transmission. The BS can use a configuration grant to allocate UL resources to the UE. Two types of configuration grants can be used, type 1 and type 2. In type 1, the BS directly provides the configured UL grant (including periodicity) through RRC signaling. In type 2, the BS can configure the periodicity of the RRC-configured UL grant through RRC signaling, and signal, enable or disable the configured UL grant by addressing the PDCCH to the configuration scheduling RNTI (CS-RNTI). For example, in type 2, the PDCCH addressed to the CS-RNTI indicates that until deactivation, the corresponding UL grant can be implicitly reused according to the periodicity configured by RRC signaling.

[0181] On the DL, the BS may dynamically allocate DL resources to the UE via a PDCCH addressed to the C-RNTI. The UE monitors the PDCCH to discover possible DL grants. The BS may use SPS to allocate DL resources to the UE. The BS may configure the periodicity of the configured DL assignments via RRC signaling, and signal, enable, or disable the configured DL assignments via a PDCCH addressed to the CS-RNTI. For example, the PDCCH addressed to the CS-RNTI indicates that until deactivation, the corresponding DL assignment may be implicitly reused according to the periodicity configured via RRC signaling.

[0182] The PUSCH carries UL data (e.g., UL-SCH TB) and / or UL control information (UCI), and is transmitted based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled, the UE may transmit the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled, the UE may transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH may be dynamically scheduled by the PDCCH (dynamic scheduling) or semi-statically scheduled based on high-layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)) (configuration scheduling (CS)). Therefore, in dynamic scheduling, PUSCH transmission accompanies the PDCCH, but in CS, PUSCH transmission does not accompany the PDCCH. CS includes type 1 configuration grant (CG) PUSCH transmission and type 2CG PUSCH transmission. In type 1CG, all parameters of PUSCH transmission are signaled via higher layers. In type 2CG, some parameters of PUSCH transmission are signaled via higher layers, and the remaining parameters are signaled by PDCCH. Basically, in CS, PUSCH transmission is not accompanied by PDCCH.

[0183] Figure 6 is a diagram showing physical channels in a 3GPP-based communication system as an exemplary wireless communication system and a signal transmission / reception process using the physical channels.

[0184] Figure 6 An example of physical channels used in a 3GPP-based communication system and a signal transmission / reception process using these channels is shown.

[0185] When the UE is powered on or when the UE has been disconnected from the wireless communication system, the UE searches for a cell to reside in and performs an initial cell search, involving synchronization with a BS in the cell (S11). For the initial cell search, the UE receives a synchronization signal block (SSB) (also called an SS / PBCH block) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as a cell identification (ID). The UE can obtain broadcast information in the cell based on the PBCH. The UE can receive a DL reference signal (RS) during the initial cell search to monitor the DL channel status.

[0186] After the initial cell search, the UE may camp on the cell. Subsequently, the UE may monitor the PDCCH in the cell and acquire more specific system information by receiving the PDSCH based on the DCI carried on the PDCCH (S12).

[0187] Subsequently, in order to complete the connection with the BS, the UE may perform a random access procedure (S13 to S16). In the random access procedure, for example, the UE may send a preamble on the PRACH (S13) and receive a PDCCH and a random access response (RAR) to the preamble on the PDSCH corresponding to the PDCCH (S14). When the UE fails to receive the RAR directed to the UE, the UE may attempt to retransmit the preamble. In the case of contention-based random access, the UE may send a PUSCH based on the UL resource assignment included in the RAR (S15), and perform a contention resolution procedure including reception of the PDCCH and the PDSCH corresponding to the PDCCH (S16).

[0188] After the above process, the UE may receive PDCCH / PDSCH from the BS (S17) and send PUSCH / PUCCH to the BS (S18) during general UL / DL signal transmission. The control information sent by the UE to the BS is generally referred to as uplink control information (UCI). UCI includes hybrid automatic repeat request acknowledgment / negative acknowledgment (HARQ ACK / NACK), scheduling request (SR) and channel state information (CSI). CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI) and / or rank indication (RI). Typically, UCI is sent on PUCCH. However, when control information and data should be sent simultaneously, control information may be sent on PUSCH. In addition, upon receiving a request / command from the network, the UE may send UCI on PUSCH aperiodically.

[0189] Figure 7 The system information (SI) acquisition process is shown.

[0190] The UE can acquire access stratum / non-access stratum (AS / NAS) information from the SI acquisition process. The SI acquisition process can be applied to UEs in the following states: RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED. RRC_CONNECTED refers to a state in which the UE has established an RRC connection with the network. RRC_IDLE refers to a state in which the UE is not registered in a specific cell and has not received an AS context and other information from the network. RRC_INACTIVE refers to a state in which the UE remains in a state called CM-CONNECTED, in which the UE has a signaling connection with the core network for connection management (CM) and is able to move within an area defined by a radio access network (RAN) (e.g., BS) without notifying the RAN. CM_CONNECTED refers to a state in which the UE has a NAS signaling connection with the core network. CM_IDLE refers to a state in which the UE has no NAS signaling connection.

[0191] In a 3GPP-based system, system information (SI) may be classified into a master information block (MIB) and multiple system information blocks (SIBs). MIB and multiple SIBs are divided into minimum system information (SI) and other SI, where the minimum SI consists of MIB and system information block 1 (SIB1), and includes basic information required for initial access and information for acquiring any other SI. SIB1 may be referred to as remaining minimum system information (RMSI). Details are provided below.

[0192] -MIB is always sent on BCH with a periodicity of 80ms and is repeated within 80ms. MIB includes information / parameters related to SIB1 reception and is sent through PBCH in SSB. During initial cell selection, the UE assumes that the half frame including the SSB is repeated with a periodicity of 20ms. The UE can determine whether there is a control resource set (CORESET) for the Type0-PDCCH common search space based on the MIB. The Type0-PDCCH common search space is a PDCCH search space and is used to send a PDCCH that schedules SI messages. When a Type0-PDCCH common search space exists, the UE can determine (i) multiple consecutive RBs and one or more consecutive symbols included in the CORESET and (ii) the PDCCH timing (i.e., the time domain position for PDCCH reception) based on the information in the MIB (e.g., pdcch-ConfigSIB1). When there is no Type0-PDCCH common search space, pdcch-ConfigSIB1 provides information about the frequency position where SSB / SIB1 exists and information about the frequency range where SSB / SIB1 does not exist.

[0193] The MIB may include the following fields.

[0194] -subCarrierSpacingCommon ENUMERATED{scs15or60,scs30or120},

[0195] -ssb-SubcarrierOffset INTEGER(0..15),

[0196] -pdcch-ConfigSIB1 INTEGER(0..255), ...

[0198] -dmrs-TypeA-Position ENUMERATED{pos2,pos3},

[0199] The subCarrierSpacingCommon field indicates the SCS for SIB1, Msg2 / 4 for initial access, paging, and broadcast SI messages. When the UE acquires the MIB on the FR1 carrier frequency, the value of scs15or60 corresponds to 15kHz. When the UE acquires the MIB on the FR2 carrier frequency, the value of scs30or120 corresponds to 120kHz.

[0200] The pdcch-ConfigSIB1 field determines the common CORESET, CSS, and necessary PDCCH parameters. If the ssb-SubcarrierOffset field indicates that SIB1 does not exist, the pdcch-ConfigSIB1 field indicates the frequency location where the UE can find the SS / PBCH block containing SIB1 or the frequency range where the network does not provide the SS / PBCH block containing SIB1.

[0201] The ssb-SubcarrierOffset field corresponds to k SSB , where k SSB Indicates the frequency domain offset between the SSB and the entire resource block grid and is expressed as the number of subcarriers. As specified in 3GPP TS 38.213, the value range of the ssb-SubcarrierOffset field can be extended by encoding additional MSBs within the PBCH. The ssb-SubcarrierOffset field can also indicate that the cell does not provide SIB1 and there is no CORESET#0 configured by the MIB.

[0202] The dmrs-TypeA-Position field indicates the position of the first DMRS of DL (eg, PDSCH) and UL (eg, PUSCH). In addition, pos2 represents the second symbol of the time slot, and pos3 represents the third symbol of the time slot.

[0203] If k SSB (for FR1)≤23 or k SSB (for FR2)≤11, the UE may determine that there is a CORESET for Type0-PDCCHCSS. SSB (For FR1)>23 or k SSB (for FR2)>11, the UE may determine that there is no CORESET for Type0-PDCCH CSS.

[0204] -SIB1 is sent on the downlink shared channel (DL-SCH) with a periodicity of 160ms and a variable transmission repetition periodicity within 160ms. The default transmission repetition periodicity of SIB1 is 20ms, but the actual transmission repetition periodicity depends on the network implementation. SIB1 includes information about the availability and scheduling (e.g., transmission periodicity and SI window size) of the remaining SIBs (hereinafter referred to as SIBx, where x is an integer greater than or equal to 2). For example, SIB1 may indicate whether SIBx is broadcast periodically or provided on demand at the request of the UE. When SIBx is provided on demand, SIB1 may include the information required by the UE to perform an SI request. SIB1 is a cell-specific SIB. The PDCCH that schedules SIB1 is sent in the Type0-PDCCH common search space, and SIB1 is sent via the PDSCH indicated by the PDCCH.

[0205] -SIBx is included in the SI message and transmitted through the PDSCH. Each SI message is transmitted within a time window (ie, SI window) that occurs periodically.

[0206] Figure 8 The random access process applicable to the implementation of the present disclosure is shown. Specifically, Figure 8 (a) shows a 4-step random access process, Figure 8 (b) shows a 2-step random access process.

[0207] The random access procedure can be used for various purposes, including initial access, UL synchronization adjustment, resource allocation, switching, radio link reconfiguration after radio link failure, and positioning. The random access procedure is classified into a contention-based procedure and a dedicated (i.e., non-contention-based) procedure. The contention-based random access procedure generally involves initial access, while the dedicated random access procedure is used for UL synchronization reconfiguration in the case of switching, DL data arriving at the network, and positioning. In the contention-based random access procedure, the UE randomly selects a random access (RA) preamble. Therefore, multiple UEs may send the same RA preamble at the same time, so a subsequent contention resolution procedure is required. In the dedicated random access procedure, the UE uses the RA preamble uniquely allocated by the BS to the UE. Therefore, the UE can perform a random access procedure without conflicting with other UEs.

[0208] Reference Figure 8 (a) of the present invention, the contention-based random access procedure includes the following four steps. The messages sent in steps 1 to 4 may be referred to as message 1 (Msg1) to message 4 (Msg4), respectively.

[0209] - Step 1: UE sends RA preamble on PRACH.

[0210] - Step 2: The UE receives the RAR from the BS on the PDSCH.

[0211] -Step 3: The UE sends UL data to the BS on the PUSCH. The UL data includes a layer 2 (L2) / layer 3 (L3) message.

[0212] - Step 4: The UE receives a contention resolution message from the BS on the PDSCH.

[0213] The UE may receive random access information from the BS in the system information. For example, information about the RACH timing associated with the SSB on the cell may be provided in the system information. The UE may select an SSB whose reference signal received power (RSRP) measured based on the SSB exceeds a threshold among the SSBs received on the cell. The UE may then send an RA preamble on the PRACH associated with the selected SSB. For example, when the UE requires random access, the UE sends Msg1 (e.g., a preamble) to the BS on the PRACH. The BS may identify each RA preamble by the time / frequency resource (RA timing (RO)) carrying the RA preamble and the preamble index (PI). Upon receiving the RA preamble from the UE, the BS sends a RAR message to the UE on the PDSCH. In order to receive the RAR message, the UE monitors the L1 / L2 control channel (PDCCH) with a cyclic redundancy check (CRC) masked with a random access-RNTI (RA-RNTI) within a preconfigured time window (e.g., ra-ResponseWindow), including scheduling information for the RAR message. When scheduling information is received on the PDCCH masked with RA-RNTI, the UE may receive a RAR message on the PDSCH indicated by the scheduling information. The UE then checks whether there is a RAR pointing to the UE in the RAR message. Whether there is a RAR pointing to the UE can be determined by checking whether there is a random access preamble ID (RAPID) of the preamble sent by the UE. The index of the preamble sent by the UE may be the same as the RAPID. The RAR includes the index of the corresponding RA preamble, the timing offset information of UL synchronization (e.g., timing advance command (TAC)), the UL scheduling information (e.g., UL grant) transmitted by Msg3, and the UE temporary identification information (e.g., temporary-C-RNTI (TC-RNTI)). Upon receiving the RAR, the UE sends Msg3 on the PUSCH according to the UL scheduling information and timing offset value in the RAR. Msg3 may include the ID (or global ID) of the UE. In addition, Msg3 may include RRC connection request related information (e.g., RRCSetupRequest message) for initial access to the network. After receiving Msg3, the BS sends a contention resolution message (i.e., Msg4) to the UE. When the UE receives the contention resolution message and the contention resolution is successful, the TC-RNTI is changed to the C-RNTI. Msg4 may include the ID of the UE / RRC connection related information (e.g., RRCSetup message). When the information sent in Msg3 does not match the information received in Msg4 or when the UE does not receive Msg4 within a predetermined time, the UE may determine that the contention resolution has failed and retransmit Msg3.

[0214] The dedicated random access procedure includes the following three steps. The messages sent in step 0 to step 2 may be referred to as Msg0 to Msg2, respectively. The BS may trigger the dedicated random access procedure through a PDCCH serving the purpose of commanding RA preamble transmission (hereinafter, referred to as a PDCCH command).

[0215] - Step 0: The BS allocates a RA preamble to the UE through dedicated signaling.

[0216] - Step 1: UE sends RA preamble on PRACH.

[0217] - Step 2: The UE receives the RAR from the BS on the PDSCH.

[0218] Step 1 and step 2 of the dedicated random access procedure may be the same as step 1 and step 2 of the contention-based random access procedure.

[0219] NR systems may require lower latency than legacy systems. In particular, for delay-sensitive services such as URLLC, a 4-step random access procedure may not be preferred. Various scenarios in NR systems may require a low-latency random access procedure. When the implementation of the present disclosure is implemented together with a random access procedure, the implementation of the present disclosure may be implemented together with the following 2-step random access procedure to reduce the delay involved in the random access procedure.

[0220] Reference Figure 8 (b), the 2-step random access procedure may be performed in two steps: MsgA transmission from the UE to the BS and MsgB transmission from the BS to the UE. MsgA transmission may include transmission of an RA preamble on the PRACH and transmission of an UL payload on the PUSCH. In MsgA transmission, the PRACH and the PUSCH may be transmitted in time division multiplexing (TDM). Alternatively, in MsgA transmission, the PRACH and the PUSCH may be transmitted in frequency division multiplexing (FDM).

[0221] Upon receiving MsgA, the BS may send MsgB to the UE. MsgB may include the RAR for the UE.

[0222] An RRC connection request related message (e.g., an RRCSetupRequest message) requesting establishment of a connection between the RRC layer of the BS and the RRC layer of the UE may be included in the payload of MsgA. In this case, MsgB may be used to send RRC connection related information (e.g., an RRCSetup message). In contrast, an RRC connection request related message (e.g., an RRCSetupRequest message) may be sent on the PUSCH based on the UL grant in MsgB. In this case, RRC connection related information (e.g., an RRCSetup message) related to the RRC connection request may be sent on the PDSCH associated with the PUSCH transmission after the PUSCH transmission based on MsgB.

[0223] Fig. 9 The multiplexing pattern of SSB and CORESET is shown. Specifically, Fig. 9 (a) shows SSB and CORESET multiplexing pattern 1, Fig. 9 (b) shows SSB and CORESET multiplexing pattern 2, Fig. 9 (c) shows SSB and CORESET multiplexing pattern 3. The SSB and CORESET multiplexing pattern may be predetermined based on a frequency range (FR) to which a corresponding cell belongs or an SCS of an SSB or a PDCCH.

[0224] like Fig. 9 As shown, SSB and CORESET can be multiplexed in the time domain, in both the time domain and the frequency domain, or in the frequency domain.

[0225] The PDCCH candidate set monitored by the UE is defined according to the PDCCH search space set. The search space set can be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration.

[0226] The UE monitors a set of PDCCH candidates in one or more CORESETs on an active DLBWP on each enabled serving cell configured with PDCCH monitoring according to a corresponding search space set, where monitoring means receiving each PDCCH candidate and decoding according to the monitored DCI format.

[0227] Fig.10 Discontinuous Reception (DRX) operation is shown. In particular, Fig.10 The DRX cycle of the UE in the RRC_CONNECTED state is shown.

[0228] The UE may perform DRX operation while performing the processing and / or method according to some implementations of the present disclosure. A UE configured with DRX can reduce power consumption by discontinuously receiving DL signals. DRX operation may be performed in the RRC_IDLE state, the RRC_INACTIVE state, and the RRC_CONNECTED state. In the RRC_IDLE and RRC_INACTIVE states, DRX is used to discontinuously receive paging signals. In the following, DRX performed in the RRC_CONNECTED state (RRC_CONNECTED DRX) is described.

[0229] Reference Fig.10 , the DRX cycle is configured with an on-duration and a DRX opportunity. The DRX cycle defines the time interval at which the on-duration is periodically repeated. The on-duration represents the duration that the UE monitors to receive the PDCCH. When DRX is configured, the UE performs PDCCH monitoring during the on-duration. When the PDCCH is successfully detected while monitoring the PDCCH, the UE starts an inactivity timer and maintains the timer in an awake state. On the other hand, when the PDCCH is not successfully detected while monitoring the PDCCH, the UE enters a sleep state after the on-duration ends. Therefore, when DRX is configured, PDCCH monitoring / reception may be performed discontinuously in the time domain when performing methods and / or processes according to some implementations of the present disclosure. For example, when DRX is configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH search space) may be configured discontinuously according to the DRX configuration. On the other hand, when DRX is not configured, PDCCH monitoring / reception may be performed continuously in the time domain when performing methods and / or processes according to some implementations of the present disclosure. For example, when DRX is not configured, PDCCH reception opportunities (eg, time slots with PDCCH search spaces) may be configured continuously. Regardless of whether DRX is configured, PDCCH monitoring may be limited to a duration configured as a measurement gap.

[0230] The following table shows the UE processing related to DRX. Referring to the following table, DRX configuration information is received via high-layer (e.g., RRC) signaling, and whether DRX is turned on / off is controlled by the DRX command of the MAC layer. When configuring DRX, the UE can Fig.10 As shown, PDCCH monitoring is performed discontinuously.

[0231] [Table 7]

[0232]

[0233] MAC-CellGroupConfig includes configuration information required to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, MAC-CellGroupConfig may include the following parameter information to define DRX.

[0234] -drx-OnDurationTimer: The length of the start duration of the DRX cycle, also referred to as the on-duration timer in this disclosure

[0235] -drx-SlotOffset: Delay indication of the time slot before drx-OnDurationTimer starts

[0236] -drx-StartOffset: specifies the subframe where the DRX cycle starts

[0237] -drx-InactivityTimer: The length of time that the UE remains awake after detecting a PDCCH opportunity indicating initial UL or DL ​​data, also referred to as the inactivity timer in this disclosure.

[0238] -drx-HARQ-RTT-TimerDL: Maximum duration between receiving a DL initial transmission and receiving a DL retransmission

[0239] -drx-HARQ-RTT-TimerDL: Maximum duration between receiving an UL initial transmission grant and receiving an UL retransmission grant

[0240] -drx-RetransmissionTimerDL (per DL HARQ process): Maximum duration until a DL retransmission is received

[0241] -drx-RetransmissionTimerUL (per UL HARQ process): Maximum duration until receiving UL retransmission grant

[0242] -drx-LongCycleStartOffset: The length and starting point of the DRX cycle

[0243] -drx-ShortCycle (optional): The length of the short DRX cycle

[0244] -drx-ShortCycleTimer (optional): Short DRX cycle operation timing

[0245] For example, the value of the multiple of the short DRX cycle may be configured by drx-CycleTimer. For example, the value of n may correspond to n*drx-ShortCycle.

[0246] If the DRX group is in the active time, the UE may perform PDCCH monitoring on the service cells within the DRX group. In this case, the DRX group refers to a group of service cells configured by RRC and having the same DRX active time. When DRX is configured, the active time of the service cells in the DRX group includes i) the time when the drx-onDurationTimer or drx-InactivityTimer configured for the DRX group is running; or ii) the drx-RetransmissionTimerDL or drx-RetransmissionTimerUL is running on any service cell in the DRX group; or the ra-ContentionResoultionTimer or msgB-RsponseWindow is running; or the time when no PDCCH indicating a new transmission of the C-RNTI sent to the MAC entity of the UE is received after successfully receiving a random access response to a random access preamble that was not selected by the MAC entity among the contention-based random access preambles.

[0247] Fig.11 The configuration of the long DRX cycle and the short DRX cycle is shown. Specifically, Fig.11 The case where drx-ShortCycleTimer is set to 2 is shown.

[0248] The BS may configure a long DRX cycle and an additional short DRX cycle that is shorter than the long DRX cycle. If the short DRX cycle is not configured, the UE may follow the long DRX cycle. When the short DRX cycle is configured, the BS may set the duration of the long DRX cycle to a positive integer multiple of the short DRX cycle. If there is no data activity during the on-duration of the long DRX cycle, the UE may follow the long DRX cycle as if the short DRX cycle was not configured. If there is data activity during the on-duration of the long DRX cycle, for example, while drx-onDurationTimer is running, the UE switches to the short DRX cycle and follows the short DRX cycle for a specific time period (for example, while drx-ShortCycleTimer is running). Reference Fig.11 If there is no data activity during the time when the UE follows the short DRX cycle, for example, if there is no data activity during the period defined by drx-ShortCycleTimer*drx-ShortCycle, the UE switches from a short DRX cycle to a long DRX cycle, each having a duration of drx-ShortCycleTimer.

[0249] Fig.12FIG. 4 shows the transmission of SIB1 in a 3GPP-based system. Fig.12 In, P SIB1 Indicates the transmission periodicity or repetition periodicity of SIB1. SIB1 PDSCH refers to the PDSCH carrying SIB1. SIB1 PDCCH refers to the PDCCH in the DCI format carrying the scheduling SIB1 PDSCH.

[0250] According to the current 5G specifications, Fig.12 In , as part of the minimum system information required for cell access, SIB1 is sent on DL-SCH with a periodicity of 160ms or a variable transmission repetition periodicity within 160ms. The default transmission repetition periodicity of SIB1 is 20ms, but the actual transmission repetition periodicity depends on the network implementation. For SSB and CORESET multiplexing pattern 1, the transmission repetition period of SIB1 is 20ms. For SSB and CORESET multiplexing pattern 2 / 3, the transmission repetition period of SIB1 is the same as the SSB period.

[0251] The PDCCH monitoring timing at which the UE attempts to decode the SIB1 PDCCH may be determined based on information in the MIB (e.g., pdcch-ConfigSIB1). For example, during a cell search, if the UE determines based on the MIB that a Type0-PDCCH CSS set exists, the UE may determine the number of consecutive RBs and the number of consecutive symbols of the CORESET of the Type0-PDCCH CSS set from controlResourceSetZero in pdcch-ConfigSIB1. The UE may also determine the PDCCH monitoring timing from searchSpaceZero in pdcch-ConfigSIB1. For example, for an SSB with index i, the system frame number (SFN) of the frame of the relevant CORESET may be provided by searchSpaceZero, and the SFN C ; and SFN C The corresponding frame includes the first time slot of the Type-0 monitoring opportunity, time slot n0; and a combination of parameter values ​​required to determine the index of the first symbol of the corresponding CORESET in time slot n0.

[0252] The UE may monitor the Type0-PDCCH CSS set in the PDCCH monitoring opportunity to detect the SIB1 PDCCH. The UE may determine the frequency resource allocation and time resource allocation of the SIB1 PDSCH from the DCI carried by the SIB1 PDCCH. The UE may receive / decode the SIB1 based on the frequency resource allocation and time resource allocation.

[0253] When the UE has no ongoing data transmission / reception, the UE enters RRC_IDLE or RRC_INACTIVE to save power. When DL data for the UE arrives at the network, the network sends a paging message on a paging occasion (PO) to trigger the RRC setup process and the RRC connection recovery process. PO refers to a set of PDCCH monitoring opportunities and may consist of multiple time slots (e.g., subframes or OFDM symbols). DCI with a CRC scrambled with P-RNTI may be sent on the PO. In multi-beam operation, the UE assumes that the same paging message is repeated in all transmitted beams. The paging message is the same for both paging initiated by the radio access network (RAN) and paging initiated by the core network (CN). A paging frame (PF) is a radio frame and may contain one or more POs or the starting point of a PO. The UE monitors one paging occasion (PO) per DRX cycle. The PF and PO used for paging can be determined by a predetermined equation. For example, in some implementations, the system frame number (SFN) of the PF may be determined by (SFN+PF_offset) mod T = (Tdiv N) * (UE_ID mod N), and the index i_s indicating the index of the PO may be determined by i_s = floor(UE_ID) mod Ns, where T is the DRX cycle of the UE and is determined by the shortest of the UE-specific DRX value and / or the default DRX value broadcast in the system information, N is the total number of paging frames in T, Ns is the number of paging occasions used for the PF, PF_offset is an offset for PF determination, and UE_ID is a value determined based on the 5G-S-TMSI. The following parameters may be signaled in SIB1: a parameter related to the number of POs per paging frame, Ns; ​​a parameter for deriving the total number of paging frames in T, nAndPagingFrameOffset; a parameter related to the number of PDCCH monitoring occasions corresponding to SSBs in the PO, nrofPDCCH-MonitoringOccasionsPerSSB-InPO; and the length of the default DRX cycle. The values ​​of N and PF_offset are derived from the parameter nAndPagingFrameOffset. The PDCCH monitoring occasion for paging is determined based on the following parameters: a parameter indicating the first PDCCH monitoring occasion for paging for each PO of the PF, firstPDCCH-MonitoringOccasionOfPO; and a parameter nrofPDCCH-MonitoringOccasionsPerSSB-InPO. For paging in the initial DL BWP, the parameter firstPDCCH-MonitoringOccasionOfPO may be signaled in SIB1.For paging in a DL BWP other than the initial DL BWP, the parameter firstPDCCH-MonitoringOccasionOfPO may be signaled in the corresponding BWP configuration.

[0254] To reduce power consumption, the UE may use Paging Early Indication (PEI) in RRC_IDLE and RRC_INACTIVE states. When PEI configuration is provided in the system information, if the UE is in RRC_IDLE or RRC_INACTIVE state and supports PEI, the UE may use the PEI parameters in the system information to monitor PEI. The UE monitors one PEI per DRX cycle. A PEI opportunity (PEI-O) is a set of PDCCH monitoring opportunities, which may consist of multiple time slots (e.g., subframes or OFDM symbols) in which PEI can be sent. In multi-beam operation, the UE assumes that the same PEI is repeated across all transmitted beams. The temporal position of the PEI-O for the UE's PO is determined by a reference point and an offset. The reference point is the starting point of the reference frame, which is determined by a frame-level offset from the starting point of the first PF among the PFs associated with the PEI-O, and is provided by the pei-FrameOffset in SIB1. The offset is the symbol-level offset from the reference point to the start of the first PDCCH monitoring occasion of PEI-O, which is provided by firstPDCCH-MonitoringOccasionOfPEI-O in SIB1. If a single PEI-O is associated with the PO of two PFs, the two PFs are consecutive PFs calculated by the parameters PF_offset, T, Ns and N. For more detailed information on PEI, refer to 3GPP TS 38.304 and 3GPP TS 38.213.

[0255] Paging DRX is defined as follows: A UE in RRC_IDLE or RRC_INACTIVE state is required to monitor the paging channel during one PO per DRX cycle. The network can configure the following paging DRX cycles: i) For paging initiated by the core network (CN initiated paging), a default cycle is broadcast in the system information; ii) For paging initiated by CN, a UE-specific cycle can be configured through non-access stratum (NAS) signaling; and iii) For paging initiated by the radio access network (RAN), a UE-specific cycle can be configured through RRC signaling. The UE uses the shortest cycle among the applicable DRX cycles. For example, a UE in RRC_IDLE can use the shorter of the first two DRX cycles among the three DRX cycles, and a UE in RRC_INACTIVE can use the shortest of the three DRX cycles.

[0256] When there is no data to send, the BS can save energy based on symbol muting. However, common signals / channels such as SSB and SIB are always-on signals / channels that need to be sent at all times, so it is difficult to achieve energy saving effects based on symbol muting in relevant symbols. In NR, SSB / SIB are sent by beam sweeping with specific subcarrier spacing and multiple beams for each frequency range (FR), and the number of beams increases as the FR increases. Therefore, compared with FR1, the amount of time resources used to send common signals / channels such as SSB and SIB in FR2 can be relatively higher, which may result in a higher energy consumption ratio of the BS.

[0257] In order to reduce the energy consumed by the BS due to the transmission of always-on signals / channels such as SSB and SIB, the periodicity of SSB and SIB can be set to be longer. However, in this case, the time required for the UE to access the cell may increase, and problems such as the failure of the traditional UE to correctly discover the cell may occur. Therefore, in a scenario where the UE can receive common signals / channels such as SSB and SIB on a specific carrier, the BS may send common signals / channels such as SSB and SIB on other carriers with a significantly long periodicity or not send signals at all. The BS may only send the minimum signal required for cell discovery (e.g., discovery signal), thereby reducing the energy consumption caused by the transmission of common signals / channels such as SSB and SIB. When the UE sends a specific signal (e.g., wake-up signal (WUS)) to connect to the carrier, the BS may send SSB, SIB1, etc. to allow the connection. In the case of a UE having both an anchor component carrier (CC) that periodically sends SSB / SIB and a non-anchor CC that sends SSB / SIB or only sends a discovery signal with a significantly long periodicity, the anchor CC may send system information (SI) about the non-anchor CC. Based on the assistance information, if the UE needs to connect to the non-anchor CC, the UE can receive SI in an on-demand manner through a signal such as WUS. In this case, the BS can save energy by continuously skipping SSB / SIB transmission on the non-anchor CC.

[0258] In the present disclosure, when a BS operates in a network energy saving (NES) mode to save energy, it means that the BS configures a plurality of shutdown periods (DTX periods of the BS) in which transmission of a specific DL signal is turned off during a specific time period. By dynamically indicating one of the shutdown periods, the BS may indicate that a DL signal may not be sent during a predefined time period, thereby reducing power consumption of both the BS and the UE. In addition, in the time domain and in the frequency domain, BWP switching, dynamic resource block (RB) adaptation, and in the spatial domain, for example, when a specific receiving antenna port of the BS is semi-statically or dynamically turned off, the NES mode may refer to an operating mode in which the BS does not perform transmission and / or reception on the antenna port to achieve a power consumption saving effect for both the BS and the UE.

[0259] <Method 1> A method in which the BS informs the UE via a specific SSB or PBCH that a common signal / channel such as SIB1 will be transmitted on demand, and the UE requests transmission of a common signal / channel such as SIB1 on demand via UL WUS

[0260] >(1-1) While sending a specific SSB, the BS may notify that on-demand SIB1 is operating through a specific bit in the PBCH, a specific PSS and / or SSS sequence, or a PBCH DMRS sequence.

[0261] >(1-2) When the BS does not send SIB1 but continues to send SIB1 scheduling information (controlResourceSetZero and searchSpaceZero of pdcch-ConfigSIB1) through MIB, some reserved states of controlResourceSetZero or searchSpaceZero can be used to indicate that on-demand SIB1 is operating.

[0262] >>i. In some implementations, after the UE sends the RACH for the SIB1 request, the BS sends an ACK for the SIB1 request through CORESET 0. Upon successful reception of the ACK, the UE may monitor the SI-RNTI.

[0263] >>ii. In some implementations, the SIB1 transmitted by the BS after receiving the SIB1 request from the UE may refer to the SIB1 linked to a specific SSB index corresponding to the RACH transmitted by the UE or the SIB1 linked to all transmitted SSB indices.

[0264] >>iii. In some implementations, after RACH transmission, the UE may receive ACK via the predefined CORESET0 / SS0 (ie, search space set index 0). Alternatively, in the event that ACK is not received, the UE may check for valid controlResourceSetZero or searchSpaceZero information before receiving SIB1.

[0265] >(1-3) While sending a specific SSB, the BS can use specific information in the SSB or the ssb-SubcarrierOffset k in the MIB SSB Notification that on-demand SIB1 is operating. The BS may send SIB1 based on a request from the UE. In this case, the SSB may not include the configuration of the CORESET#0 / Type0-PDCCH CSS set.

[0266] >>i. In some implementations, if the BS indicates a reservation status for specific information in the SSB (the BS may use a portion of the SSB PBCH payload, such as reserving 1 bit), the UE may interpret this as the BS operating SIB1 on demand. Then, the UE may request the BS to send SIB1 through a pre-configured or pre-defined PRACH transmission in the corresponding state.

[0267] >>ii. In some implementations, if the BS passes a specific k SSB If the value indicates a reserved state, the advanced UE may interpret that the BS operates SIB1 on demand and transmit a RACH for requesting SIB1.

[0268] >>iii. In some implementations, if CORESET0 / SS0 information does not need to be sent for on-demand SIB1 reception, then for the (predefined) case without information (for the no information case), the advanced UE may interpret that the BS operates SIB1 on-demand and perform operations such as sending RACH for SIB1 request.

[0269] However, an advanced UE refers to a UE that has the ability to interpret information from the BS that informs the cell that it is operating in NES mode and is capable of operating according to the NES operation indication / configuration of the BS. The UL WUS resources used by the UE to request SIB1 transmission from the BS are defined in the standard document, or the resources configured in the SSB (or cell-defined SSB (CD-SSB)) can be used for WUS transmission. In this case, a predefined or preconfigured specific UL signal / channel (e.g., RACH) can be used for UL WUS. The methods and / or processes according to the present disclosure can be applied when the BS sends CD-SSB but operates SIB1 on demand, which means that SIB1 is not actually sent. That is, these methods and / or processes can be applied to scenarios where idle / inactive UEs send UL WUS (e.g., RACH) to request SIB1.

[0270] Hereinafter, the details of the methods described in (1-1) to (1-3) will be explained.

[0271] There are two types of SSBs within a carrier: cell-defined SSBs (CD-SSBs) and non-CD-SSBs (NCD-SSBs). According to Section 5.2.4 of 3GPPTS 38.300, multiple SSBs can be sent within the frequency range of a carrier. The physical cell identifier (PCI) of multiple SSBs sent at different frequency locations does not need to be unique. In other words, different SSBs in the frequency domain may have different PCIs. However, when an SSB is associated with an RMSI, the SSB is called a CD-SSB. The Pcell is always associated with a CD-SSB within a synchronization raster. A CD-SSB is an SSB associated with SIB1, which has the NR cell global identifier (NCGI) of the cell and is always in the initial BWP. The UE can determine the location of the CD-SSB by cell search in the synchronization raster. On the other hand, the NCD-SSB is not associated with SIB1 and can be used for EN-DC. The UE can determine the location of the NCD-SSB through RRC reconfiguration, and one or more types of SSBs may exist within the same BWP.

[0272] Specifically, even if the BS does not send SIBs for energy saving, the BS may need to send a minimum amount of SSBs to allow the UE to discover and connect to the cell. In addition, the BS may inform the UE that the BS does not send SIBs for network energy saving, but if the UE sends UL WUS, SIB1 may be sent on demand. The BS may send this information through specific bits in the PBCH payload, specific PSS and / or SSS sequences, or DMRS sequences in the PBCH. For example, in order to indicate that SIB1 can be sent on demand, the BS may set some or all of the 24 bits of the MIB within the PBCH payload consisting of a total of 56 bits to "1" or "0" based on a specific bit configuration pre-agreed or defined in the standard. Alternatively, the BS may use specific bits pre-agreed or defined in the standard to configure all or part of the 8 bits of the timing-related PBCH payload. Alternatively, the BS may use specific bits pre-agreed or defined in the standard to configure bits constituting all or some fields related to SCS, RMSI CORSET / search space, and initial active DL BWP. Alternatively, the BS may also indicate through a specific PSS sequence, a specific SSS sequence, or a combination of the two (or through a specific PBCH DMRS sequence) predefined or agreed upon in the standard that the BS is not currently sending SIB1, but may send SIB1 on demand.

[0273] Next, even when the BS operates in NES mode and does not transmit SIB1, if the BS transmits scheduling information about SIB1 (controlResourceSetZero and searchSpaceZero of pdcch-ConfigSIB1), the BS can use some reserved states of controlResourceSetZero or searchSpaceZero to indicate that the BS is not currently transmitting SIB1, but can transmit SIB1 on demand. The UE can use resources defined in the standard or configured in (CD-)SSB to send UL WUS to request SIB1 from the BS. In this case, the UL WUS can use a pre-agreed specific UL signal / channel, such as RACH. If the UE sends a RACH for the SIB1 request, the UE can check the ACK for the SIB1 request sent by the BS through CORESET0, and then perform SI-RNTI monitoring. The SIB1 sent by the BS after receiving the SIB1 request from the UE may refer to the SIB1 linked to the specific SSB index corresponding to the RACH sent by the UE, or the SIB1 may refer to the SIB1 linked to all transmitted SSB indexes. Alternatively, after the UE sends a WUS (eg, RACH), the UE may receive an ACK through a predefined CORESET0 / SS0 (ie, search space set index 0). Alternatively, in the event that an ACK is not received, the UE may check for valid controlResourceSetZero or searchSpaceZero information before receiving SIB1.

[0274] While sending a specific SSB, the BS may indicate that the BS is operating SIB1 on demand through specific information in the SSB and through a reservation status. In this case, the SSB may not have a configuration for the CORESET#0 / Type0-PDCCH CSS set. If the reservation status is indicated, the UE may determine whether the cell is operating SIB1 on demand based on the type / capability of the UE (e.g., a legacy UE or an advanced UE supporting Rel-18 NES). The UE may then request SIB1 transmission or perform a process to find another cell that sends a CD-SSB. Specific information within a specific SSB may be indicated by the reservation status. To this end, a portion of the SSB PBCH payload (e.g., 1 bit is reserved) may be used. A traditional UE may interpret this information as an NCD-SSB and move to another cell that sends a CD-SSB. However, an advanced UE supporting Rel-18 NES may interpret this information as a state in which it is actually a CD-SSB, but is operating SIB1 on demand. The advanced UE may then request SIB1 transmission from the BS through a predefined or preconfigured RACH transmission in the corresponding state.

[0275] Next, even when the BS operates in NES mode and does not transmit SIB1, if the BS transmits scheduling information about SIB1 (controlResourceSetZero and searchSpaceZero of pdcch-ConfigSIB1), the BS can use some reservation states of controlResourceSetZero or searchSpaceZero to indicate that the BS is not currently transmitting SIB1, but can transmit SIB1 on demand. The UE can use resources defined in the standard or configured in (CD-)SSB to send UL WUS to request SIB1 from the BS. In this case, the UL WUS can use a pre-agreed specific UL signal / channel (e.g., RACH). If the UE sends a RACH for the SIB1 request, the UE can check the ACK for the SIB1 request sent by the BS through CORESET0, and then perform SI-RNTI monitoring. The SIB1 sent by the BS after receiving the SIB1 request from the UE may refer to the SIB1 linked to the specific SSB index corresponding to the RACH sent by the UE, or the SIB1 may refer to the SIB1 linked to all transmitted SSB indexes. Alternatively, after the UE sends a WUS (eg, RACH), the UE may receive an ACK through a predefined CORESET0 / SS0 (ie, search space set index 0). Alternatively, in the event that an ACK is not received, the UE may check for valid controlResourceSetZero or searchSpaceZero information before receiving SIB1.

[0276] While sending a specific SSB, the BS may indicate that the BS is operating SIB1 on demand through specific information in the SSB and through a reservation status. In this case, the SSB may not have a configuration for the CORESET#0 / Type0-PDCCH CSS set. If the reservation status is indicated, the UE may determine whether the cell is operating SIB1 on demand based on the type / capability of the UE (e.g., a legacy UE or an advanced UE supporting Rel-18 NES). The UE may then request SIB1 transmission or perform a process to find another cell that sends a CD-SSB. Specific information within a specific SSB may be indicated by the reservation status. To this end, a portion of the SSB PBCH payload (e.g., 1 bit is reserved) may be used. A traditional UE may interpret this information as an NCD-SSB and move to another cell that sends a CD-SSB. However, an advanced UE supporting Rel-18 NES may interpret this information as a state in which it is actually a CD-SSB, but is operating SIB1 on demand. The advanced UE may then request SIB1 transmission from the BS through a predefined or preconfigured RACH transmission in the corresponding state.

[0277] The UE determines the number of consecutive RBs and the number of consecutive symbols of the CORESET of the Type0-PDCCH CSS set from controlResourceSetZero of pdcch-ConfigSIB1. In addition, the UE determines the PDCCH monitoring opportunity from searchSpaceZero of pdcch-ConfigSIB1 in the MIB. In some implementations of the present disclosure, the BS may inform the UE whether the on-demand SIB1 is operating by setting some reserved bit values ​​or reserved states in controlResourceSetZero, searchSpaceZero, or ssb-SubcarrierOffset of pdcch-ConfigSIB1 to specific values.

[0278] Referring to Table 13-16 or 13-17 in Section 13 of 3GPP TS 38.213, when the BS passes k SSB Value 30 or k in FR2 SSB When the value 14 indicates a reservation state, a legacy UE may interpret the reservation state as NCD-SSB, but a Rel-18 UE may interpret the reservation state as CD-SSB and is operating SIB1 on demand, and then send a RACH to request SIB1.

[0279] Table 8 below is from Tables 13-16 in 3GPP TS 38.213, showing that for FR1, k SSB and the combination of controlResourceSetZero and searchSpaceZero of pdcch-ConfigSIB1 to N Offset GSCN 's mapping.

[0280] [Table 8]

[0281]

[0282]

[0283] Table 9 below is from Tables 13-17 in TS 38.213, showing that for FR2, k SSB and the combination of controlResourceSetZero and searchSpaceZero of pdcch-ConfigSIB1 to N Offset GSCN 's mapping.

[0284] [Table 9]

[0285]

[0286] Referring to 3GPP TS 38.213, if the UE detects an SS / PBCH block and determines that there is no CORESET for Type0-PDCCHCSS set, and if for FR1, k SSB =31, or for FR2, k SSB =15, then the UE determines that [N Reference GSCN -N Start GSCN ,N Reference GSCN +N End GSCN There is no SS / PBCH block with Type0-PDCCH CSS set within the GSCN range of ]. Start GSCN and N End GSCN Determined by controlResourceSetZero and searchSpaceZero of pdcch-ConfigSIB1. Reference GSCN, N Reference GSCN ], the UE determines that there is no information about the second SS / PBCH block with the CORESET for the Type0-PDCCH CSS set in the detected SS / PBCH blocks.

[0287] Referring to 3GPP TS 38.213, if CORESET0 / SS0 (i.e., search space set index 0) information does not need to be provided for on-demand SIB1 reception (e.g., predefined), then for a case where there is no information (no information case), the Rel-18 UE can determine that the BS is operating SIB1 on demand and send a UL WUS (e.g., RACH) to request SIB1.

[0288] <Method 2> When the BS operates in NES mode, only UL WUS detection is performed on sparse RACH opportunity (RO) resources (which may be related to low-power WUS with significantly low received signal power) and other reception methods are turned off

[0289] >(2-1) may provide information about a carrier / cell operating in NES mode for a specific carrier / cell (eg, DL / UL BWP, RACH).

[0290] >(2-2) Compared with the dense RO for full SIB-based RACH transmission, the (RO) resources for UL WUS transmission can be more sparsely configured in the time domain.

[0291] >(2-3) If a UL WUS from a UE is detected on a carrier / cell operating in NES mode, full RACH reception may be started based on SSB transmission and SI.

[0292] However, information about UL WUS resources (e.g., RACH) for requesting initial access and transmission of common signals / channels such as SSB / SIB1 for a carrier / cell operating in NES mode may be provided by the carrier / cell operating in NES mode and / or other neighboring carriers / cells (e.g., via cell-specific RRC signaling such as SIB1). The information may include both a sparse RACH configuration for waking up a BS operating in NES mode and a traditional RACH configuration for a general RACH procedure. In addition, the methods and / or processes according to the present disclosure may be applied to a scenario in which a connected mode UE sends a WUS to a target cell when the target cell operates in NES mode during a conditional handover (HO) situation or a scenario in which a secondary cell group (SCG) is conditionally added.

[0293] Hereinafter, the details of the methods described in (2-1) to (2-3) will be explained.

[0294] While the BS operates in NES mode in which the BS does not send or only sends common signals / channels such as MIB and / or SIB with a significantly long periodicity for energy saving, the BS may perform MIB and / or SIB1 transmission and RACH procedures only when the UE sends a request through a pre-agreed or pre-configured UL WUS (e.g., RACH) for energy saving.

[0295] The UE may receive information about a carrier / cell (e.g., DL / UL BWP, RACH) operating in NES mode, send a UL WUS to request SSB / SIB1 through the carrier / cell operating in NES mode, and perform a process of connecting to the cell. In this case, the information about the UL WUS resources (e.g., SIB1) provided by a specific carrier / cell may include a sparse RACH configuration for waking up the carrier / cell operating in NES mode and a traditional RACH configuration for a general RACH process. The carrier / cell operating in NES mode may only perform detection of the UL WUS from the UE and turn off other receptions. When the UE sends a UL WUS, the target cell may receive the UL WUS before starting full SSB transmission and full RACH reception based on the SI of the cell, thereby saving energy.

[0296] Therefore, compared with the dense RO for RACH transmission based on full SIB, the (RO) resources for UL WUS transmission can be more sparsely configured in the time domain to facilitate BS energy saving. After sending the UL WUS, the UE can start full RACH transmission based on SSB and SI sent from the carrier / cell operating in NES mode. Alternatively, in the case of not receiving a separate ACK from the BS, the UE can attempt RACH transmission based on SIB1 (configured by the source cell or sent by the target cell) and continue with the connection process.

[0297] The method and / or process according to the present disclosure may be applied to a scenario in which a connected mode UE is configured for conditional HO to a target cell operating in NES mode or a scenario in which a cell operating in NES mode (e.g., a PScell ​​and / or Scell ​​belonging to an SCG) is conditionally added to an SCG. For example, the method and / or process according to the present disclosure may be applied to a scenario in which a source cell near a cell operating in NES mode provides a conditional HO command to instruct the connected mode UE to send a UL WUS (e.g., RACH) to a target cell operating in NES mode if a specific condition is met (e.g., if the RSRP is higher or lower than a pre-configured threshold) and a sparse RACH configuration as a UL WUS resource for waking up the target cell. If the specific condition is met, the UE may send a UL WUS toward the target cell (on the configured resources) and perform an existing HO process. As another example, the method and / or process according to the present disclosure may be applied to such a scenario: for dual connectivity in a cell belonging to an MCG, a cell operating in NES mode configures conditional SCG addition and WUS resources, and if a pre-configured condition is met (e.g., if RSRP is above or below a pre-configured threshold), the cell operating in NES mode sends a WUS to perform SCG addition. When a specific condition is met, the UE may send a UL WUS toward a cell belonging to the SCG (e.g., a PScell) on the configured resources and perform an existing SCG addition process.

[0298] <Method 3> While performing DL reception (RS measurement) on the configured SCell, when certain conditions are met (for example, if RSRP is above or below a pre-configured threshold), the UE sends a WUS for enabling the SCell on the WUS / RACH resources provided by the PCell

[0299] When the BS configures the SCell, but the SCell is not active, the corresponding cell operates in NES mode and only sends a minimum RS without sending common signals / channels such as SSB / SI. Alternatively, the cell sends common signals / channels with a significantly long periodicity. Upon receiving the WUS / RACH sent by the UE, the cell can switch to normal mode (non-NES mode). While performing DL reception (RS measurement) on the configured SCell, when certain conditions are met (for example, if the RSRP is higher or lower than a pre-configured threshold), the UE sends a WUS for SCell activation on the WUS / RACH resources provided by the PCell. In this case, UL WUS resources for requesting SIB1 transmission to the BS can be defined in standard documents. Alternatively, the resources configured by the PCell can be used to send WUS. A specific pre-agreed or configured UL signal / channel (for example, RACH) can be used as UL WUS. The method and / or process according to the present disclosure may be applicable to a scenario in which the UE enables the SCell through the WUS when the BS reduces SSB transmission for the SCell to save energy (eg, by configuring a longer periodicity) or completely turns off SSB transmission.

[0300] <Method 4> For network energy saving, the BS turns off or reduces SSB / SI / paging / RACH transmission / reception (for example, by configuring a significantly longer periodicity) during the time period other than the on-duration (or active time) of the UE configured with C-DRX

[0301] >(4-1) According to some implementations of the present disclosure, when a UE intending to send / receive SSB / SI / paging / RACH sends a UL WUS, the sending / receiving opportunities of a specific signal / channel may be increased.

[0302] >>i. Specific signals / channels may be pre-configured in association with respective UL WUSs (resources), and a single UL WUS may increase transmission / reception opportunities of all or some signals / channels.

[0303] The BS may send a response to the received UL WUS.The BS may increase a transmission opportunity at a specific time point when transmission of a specific signal / channel starts or during a specific time period through a pre-agreed or group common (GC) DCI.

[0304] >>ii. In some implementations, when SSB / TRS is sent only during the on-duration (or active time), the BS may configure a period of guaranteed transmission of SSB or TRS for time / frequency synchronization (synchronization raster) before the on-duration (or active time) to alleviate the RS shortage problem.

[0305] >>iii. In some implementations, since SSB or RS transmission is restricted outside the on-duration (or active time) period, the BS may concentrate RSs required for periodic measurement within the on-duration (or active time) period and relax measurement requirements.

[0306] >>iv. In some implementations, in addition to the UE-specific on-duration (or active time), the BS may configure a UE-common on-duration (or active time) for RS reception or indicate a UE-common on-duration (or active time) or window for RS reception through GC-DCI.

[0307] The above method can be applied to such a scenario: when the BS configures DRX for network energy saving, and when the BS turns off SSB / SI / paging / RACH transmission / reception or significantly reduces its density outside the on-duration (or active time), the UE sends a WUS. In this case, the active time refers to the time period during which the on-duration timer runs when the UE is configured and operates in C-DRX, the time period during which the inactivity timer runs during PDCCH reception, or the time period during which the UE needs to remain in the active state because the retransmission timer is running.

[0308] Hereinafter, the details of the method described in (4-1) will be explained.

[0309] After the UE establishes an initial connection with the BS and enters connected mode, the UE needs to continuously monitor the PDCCH for each configured search space (SS) to check whether there is any transmission scheduled for the UE. However, if such scheduling does not always exist, the UE's battery may be quickly consumed due to unnecessary PDCCH monitoring. Therefore, the BS can configure C-DRX by configuring the time period (on duration) during which the UE needs to perform PDCCH monitoring and the off duration (OFF duration) during which PDCCH monitoring is not required, thereby achieving energy saving of the UE. The UE performs PDCCH monitoring during the periodic on duration to check whether there is any DL / UL to be sent / received. Upon receiving the PDCCH, the UE performs DL reception or UL transmission based on the instruction. For UL, regardless of C-DRX, if there is data to be sent in the UL buffer, the UE can wake up from sleep mode and send an SR. In idle mode, the UE periodically performs paging monitoring, and if the UE is not a target UE, the UE can return to sleep mode and operate in idle mode DRX (I-DRX). Here, when it is said that the UE operates in sleep mode, it means that the UE can operate in sleep mode "regardless of the active time determined by C-DRX" or "during a time period outside the active time determined by C-DRX". In C-DRX operation, the repetition of a time period configured with an on-duration and an off-duration is called a DRX cycle. The length of the DRX cycle is defined as the period from the start of the on-duration to the next on-duration, and there are both long DRX cycles and short DRX cycles. If the DRX cycle length becomes longer, if there is a PDSCH to be sent immediately after the end of the current on-duration of the UE, the BS needs to wait until the next on-duration of the UE, which may increase the delay. From the perspective of the BS, since the UE does not send P-CSI or SRS during the off-duration, the BS can allocate resources to other UEs, thereby improving resource utilization. In addition, the BS can switch to energy saving mode during the off-duration of the UE to save power.

[0310] As described above, if the C-DRX operation of the UE is considered to maximize the time period during which the UE is in a sleep state to be used as the DTX period of the BS (i.e., operating in NES mode), energy saving effects can be expected. During the time period outside the on-duration (or active time) of the UE configured with C-DRX, the BS may turn off or significantly reduce SSB / SI / paging / RACH transmission / reception (e.g., by configuring a significantly long periodicity). In this case, in order to perform measurements, obtain SI, or send RACH through SSB, the UE may send UL WUS to increase the transmission / reception opportunities of specific signals / channels.

[0311] In this case, specific signals / channels can be pre-configured in association with each UL WUS (resource), and a single UL WUS can increase the transmission / reception opportunities of all or some signals / channels. For example, when the RACH is used as the UL WUS, a specific RACH index (e.g., RO and / or preamble index) is associated with the SSB, and another specific RACH index is associated with the SI. Based on the RACH index of the UL WUS transmitted by the UE, the transmission / reception opportunities of the associated signals / channels can be increased. Alternatively, when a specific WUS is transmitted, the transmission / reception of the SSB / SI / paging / RACH that has been turned off or reduced can be restored to normal operation (i.e., operating in a non-NES mode). For example, based on pre-configured information, the UE uses the RACH index of the UL WUS to request an increase in the transmission opportunities of a specific common signal / channel. After transmitting the UL WUS, the UE can expect signal reception at a period of Y(<X) ms (instead of the original X ms period).

[0312] The BS can send a response to the received UL WUS. The BS can increase the transmission opportunities at a specific time point at the start of the transmission of a specific signal / channel or during a specific time period through pre-agreement or group common (GC) DCI. For example, if the UE is configured with a specific RACH index associated with SIB1 and expects to receive SIB1 more frequently than the current periodicity during a specific time period, the UE can send the corresponding RACH index in the WUS. Then, the UE can receive a response from the BS via the RAR. The UE can expect to receive SIB1 at a specific time point or during a specific time period (e.g., 2 time slots later) indicated by pre-agreement (or GC) DCI.

[0313] In addition, when the SSB / TRS is only transmitted during the on-duration (or active time), the BS can configure a period that guarantees the transmission of the SSB or TRS for time / frequency synchronization (synchronization raster) before the on-duration (or active time) to alleviate the RS shortage problem. The UE can receive additional SSBs or TRSs in the configured period outside the on-duration (or active time) to supplement the insufficient RSs. Since the SSB or RS transmission is restricted outside the on-duration (or active time) period, the BS can concentrate the RSs required for periodic measurement within the on-duration (or active time) period and relax the measurement requirements. In addition to the UE-specific on-duration (or active time), the BS can also configure a UE-common on-duration (or active time) for RS reception or indicate a UE-common on-duration (or active time) or window for RS reception through GC-DCI.

[0314] <Method 5> Method of Assigning Specific UL WUS to Each Cell to Supplement Load-Based Cell Activation

[0315] >(5-1) When each UE tracking area is loaded, the cells to be enabled can be pre-configured.

[0316] >(5-2) The BS may assign a specific UL WUS targeting the cell to be activated based on the assistance information periodically sent by the UE.

[0317] >(5-3) Multiple UL WUS (e.g., different sequences) can be pre-configured for the UE, and if load is generated, a specific cell can become the activation target.

[0318] Hereinafter, the details of the methods described in (5-1) to (5-3) will be explained.

[0319] In addition to the PCell (cell A), the BS may also add a capacity enhancement cell (cell B) to enhance the throughput and capacity of the UE. In this case, the capacity enhancement cell (cell B) is located within the coverage of cell A and may be an SCell with a higher FR than cell A. Since the UE does not always require high throughput, cell B may operate in NES mode and be enabled for capacity enhancement when the UE requires high throughput or when a load occurs, thereby allowing cell B to send data to the UE. However, since the BS cannot determine whether a UE with a load among the UEs within the coverage area of ​​cell A is within the coverage area of ​​cell B, enabling cell B based on the load may be inefficient. For example, if the load of a UE outside the coverage area of ​​cell B causes cell B to wake up from NES mode (sleep mode), it can be seen that the wake-up is unnecessary, resulting in energy waste.

[0320] To solve the problem of load-based cell activation, the UE can send a UL WUS to activate cell B when capacity improvement is needed. In addition, considering the coverage of cell B, cell A can pre-configure the UE with the cell to be activated when load appears in each UE tracking area.

[0321] The BS may assign a specific UL WUS targeting the cell to be activated (based on the auxiliary information periodically sent by the UE). When the BS targets a specific cell for activation (if load occurs) by pre-configuring different UL WUS (e.g., different time / frequency / sequence resources) for each cell of the UE, the UE may perform activation of the cell by sending the UL WUS configured for the cell (here, activation may refer to activation of the SCell or requesting SSB and / or SI transmission from the corresponding cell).

[0322] In some embodiments of the present disclosure, the cell may be extended or replaced by a carrier, a frequency, or a physical cell ID, etc. For example, when UL WUS#1 is configured for frequency #A and UL WUS#2 is configured for frequency #B, the UE may send UL WUS#1 when requesting activation of frequency #A.

[0323] <Method 6> A method for adjusting the power of the UE UL WUS based on the power level of the DL discovery signal received by the UE according to the location of the UE in the cell

[0324] >(6-1) If the UE sends a UL WUS to a specific cell based on the received RS power but does not receive a response, the UE may perform power ramping on the UL WUS and resend the UL WUS.

[0325] When the UE transmits a UL WUS to request a common signal / channel such as SIB to the BS or to perform SCell activation, if the power of the UL WUS is too low, the BS may not be able to correctly receive the UL WUS. On the other hand, if the power of the UL WUS is too high, it may be inefficient in terms of interference or energy consumption of the UE. Therefore, in the method and / or process according to the present disclosure, the power of the UL WUS may be appropriately adjusted in consideration of the distance between the UE and the BS.

[0326] As one method, the UE may adjust the power of the UL WUS based on the power level of the DL signal (e.g., SSB, TRS, discovery signal) received by the UE according to its location within the cell. If the UE sends a WUS to a specific cell based on the received RS power but does not receive a response, the UE may perform a power ramp up on the UL WUS and resend the UL WUS.

[0327] Specifically, when the BS does not send a common signal / channel such as SSB / SIB1 for energy saving, the UE may not be able to receive the SSB and therefore may not be able to determine the SSB power. As a result, path loss (PL) estimation for WUS transmission may not be possible. To address this issue, the BS may predefine the SSB power as a fixed value (e.g., a minimum or maximum value of a configurable SSB power range) or provide the SSB power through a specific field or field combination in the MIB, which allows the UE to perform power configuration for WUS transmission based on this information. In addition, if the UE does not receive a response (e.g., RAR) from the BS after sending the WUS, the UE may gradually increase the power of the WUS in a predefined step size. If the UE reaches the maximum power (max power) or if the number of WUS retransmissions exceeds X (X predefined, signaled by the MIB, or signaled by the RRC) due to no response, the UE may be blocked from the cell (within a specific time period) or perform cell selection (reselection).

[0328] In the method and / or process according to the present disclosure, the C-DRX configuration of the BS for network energy saving may be the same as the existing UE C-DRX / I-DRX, or the C-DRX configuration may refer to a time domain on / off pattern of multiple DL / UL signals and channels dynamically indicated by L1 signaling (e.g., GC-DCI) or L2 signaling (e.g., MAC-CE). In other words, the DRX configuration (or cell-specific DRX configuration) for network energy saving (NES) refers to a (cell-specific) DTX / DRX pattern or an active / inactive pattern, in which the BS minimizes or completely shuts down the time period of transmission / reception and the time period during which the BS performs normal operation in a pre-configured or pre-agreed time period (e.g., in a standard document) for energy saving. More specifically, as an example of a DRX configuration for NES purposes, the UE may not perform PDCCH monitoring during the active time within the DRX cycle. In addition, during the time period outside the active time, the UE may skip the reception of common signals / channels such as SSB / SIB1, or may only receive common signals / channels with a significantly long periodicity. In addition, even if a signal / channel such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS is configured to be repeatedly transmitted / received during a time period outside the active time, transmission may not be performed on the resources used for the (these) signal / channel. In addition, when cell-specific DTX / DRX is configured or applied, an NES mode / state may be defined. When the NES mode / state is configured or indicated, during a specific time period operating in the NES mode, the transmission / reception of some or all DL / UL signals may be turned off, the amount of frequency resources used for transmission / reception may be reduced, the number of antenna ports used for transmission may be reduced, or the transmission power may be reduced, thereby saving energy. In addition, a BWP for NES purposes refers to a specific BWP that is switched when the on state of the NES mode is indicated (NES mode = ON). A BWP may refer to a BWP consisting of a small number of RBs, which represents the minimum amount of frequency resources (BW) among the BWPs configured for the UE. If the BS operates in non-NES mode (ie, when the off state of the NES mode (NES mode = OFF) is indicated / configured to UEs within the cell), DL / UL signal transmission / reception similar to normal BS operation can be expected.

[0329] Fig.13 A DL signal reception process in a UE according to some embodiments of the present disclosure is shown.

[0330] The UE may detect SSBs including PSS, SSS, and PBCH on the cell (S1301). The UE may obtain information about whether SIB1 is SI on demand from the SSB (S1302). Based on the fact that SIB1 is SI on demand, the UE may send a SIB1 request (S1303). The UE may monitor the PDCCH related to SIB1 based on the SIB1 request, and based on the detection of the PDCCH, the UE may receive the PDSCH carrying SIB1 (S1304).

[0331] Fig.14 A DL signal transmission procedure in a BS according to some embodiments of the present disclosure is shown.

[0332] The BS may transmit an SSB on the cell, the SSB including information on whether SIB1 is SI on demand, as well as PSS, SSS, and PBCH (S1401). Based on the fact that SIB1 is SI on demand, the BS may receive a SIB1 request (S1402). The BS may transmit a PDCCH related to SIB1 based on the SIB1 request (S1403). The BS may transmit a PDSCH carrying SIB1 (S1404).

[0333] In order to receive DL signals, the UE may perform operations according to some embodiments of the present disclosure. The UE may include: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some embodiments of the present disclosure. A processing device for a UE may include: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some embodiments of the present disclosure. A computer-readable (non-volatile) storage medium may store at least one program including instructions, which when executed by at least one processor cause the at least one processor to perform operations according to some embodiments of the present disclosure. A computer program or a computer program product may be recorded in at least one computer-readable (non-volatile) storage medium and may include instructions, which when executed, cause at least one processor to perform operations according to some embodiments of the present disclosure.

[0334] For a UE, a processing device, a computer-readable (non-volatile) storage medium and / or a computer program product, the operations may include: detecting an SSB on a cell, wherein the SSB includes a PSS, an SSS and a PBCH; obtaining information from the SSB about whether SIB1 is an on-demand SI; sending an SIB1 request based on that SIB1 is an on-demand SI; monitoring a PDCCH related to SIB1 based on the SIB1 request; and receiving a PDSCH carrying SIB1 based on detecting the PDCCH.

[0335] In some implementations of the present disclosure, the information on whether SIB1 is on-demand SI may be obtained based on at least one of a specific bit in the PBCH, a DMRS sequence for the PBCH, or a synchronization signal sequence.

[0336] In some implementations of the present disclosure, information on whether SIB1 is on-demand SI may be obtained based on the SIB1-related PDCCH configuration field in the MIB carried by the PBCH.

[0337] In some implementations of the present disclosure, the operations may include: determining whether SIB1 is on-demand SI based on that a SIB1-related PDCCH configuration field has a predetermined value; and sending a SIB1 request based on determining that SIB1 is on-demand SI.

[0338] In some implementations of the present disclosure, information about whether SIB1 is on-demand SI may be obtained based on the SSB subcarrier offset field in the MIB carried by the PBCH.

[0339] In some implementations of the present disclosure, the operation may include: determining whether SIB1 is on-demand SI based on that the SSB subcarrier offset field in the MIB has a predetermined value.

[0340] The operations may include sending a SIB1 request based on determining that the SIB1 is on-demand SI.

[0341] In some implementations of the present disclosure, sending the SIB1 request may include sending a RACH related to the SSB, and the SIB1 may be related to a predetermined SSB index corresponding to the RACH.

[0342] In some implementations of the present disclosure, sending a SIB1 request may include sending a RACH related to an SSB, and the SIB1 may be related to all transmitted SSB indexes.

[0343] In order to send a DL signal, the BS may perform operations according to some embodiments of the present disclosure. The BS may include: at least one transceiver; at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some embodiments of the present disclosure. A processing device for a BS may include: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and stores instructions, which when executed, cause the at least one processor to perform operations according to some embodiments of the present disclosure. A computer-readable (non-volatile) storage medium may store at least one program including instructions, which when executed by at least one processor cause the at least one processor to perform operations according to some embodiments of the present disclosure. A computer program or a computer program product may be recorded in at least one computer-readable (non-volatile) storage medium and may include instructions, which when executed, cause at least one processor to perform operations according to some embodiments of the present disclosure.

[0344] For a BS, a processing device, a computer-readable (non-volatile) storage medium and / or a computer program product, the operations may include: sending an SSB on a cell, wherein the SSB includes a PSS, an SSS and a PBCH, and wherein the SSB includes information about whether SIB1 is on-demand SI; based on SIB1 being on-demand SI, receiving a SIB1 request; based on the SIB1 request, sending a PDCCH related to SIB1; and sending a PDSCH carrying SIB1.

[0345] In some implementations of the present disclosure, the information on whether SIB1 is on-demand SI may be sent based on at least one of a specific bit in the PBCH, a DMRS sequence for the PBCH, or a synchronization signal sequence.

[0346] In some implementations of the present disclosure, information on whether SIB1 is on-demand SI may be sent based on a SIB1-related PDCCH configuration field in the MIB carried by the PBCH.

[0347] In some implementations of the present disclosure, information about whether SIB1 is on-demand SI may be sent based on the SSB subcarrier offset field in the MIB carried by the PBCH.

[0348] In some implementations of the present disclosure, receiving the SIB1 request may include receiving a RACH related to the SSB, and the SIB1 may be related to a predetermined SSB index corresponding to the RACH.

[0349] In some implementations of the present disclosure, receiving a SIB1 request may include receiving a RACH related to an SSB, and the SIB1 may be related to all transmitted SSB indices.

[0350] The examples of the present disclosure as described above have been presented to enable those of ordinary skill in the art to implement and practice the present disclosure. Although the present disclosure is described with reference to the examples, those skilled in the art may make various modifications and changes in the examples of the present disclosure. Therefore, the present disclosure is not intended to be limited to the examples set forth herein, but to conform to the widest scope consistent with the principles and features disclosed herein.

[0351] Implementations of the present disclosure may be used in a BS, a UE, or other devices in a wireless communication system.

[0352] Industrial Applicability

[0353] Implementations of the present disclosure may be used in a BS, a UE, or other devices in a wireless communication system.

Claims

1. A method for receiving a downlink signal by a user equipment UE in a wireless communication system, the method comprising the following steps: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; Obtaining information about whether system information block 1 SIB1 is on-demand system information SI from the SSB; Based on the SIB1 being the on-demand SI, sending a SIB1 request; Requesting monitoring of a physical downlink control channel PDCCH related to the SIB1 based on the SIB1; and Based on detecting the PDCCH, a physical downlink shared channel PDSCH carrying the SIB1 is received.

2. The method according to claim 1, wherein: The information on whether the SIB1 is the on-demand SI is obtained based on at least one of a specific bit in the PBCH, a demodulation reference signal DMRS sequence or a synchronization signal sequence used for the PBCH.

3. The method according to claim 1, wherein: The information on whether the SIB1 is the on-demand SI is obtained based on a SIB1-related PDCCH configuration field in a master information block MIB carried by the PBCH.

4. The method according to claim 3, comprising the following steps: Determining whether the SIB1 is the on-demand SI based on that the SIB1-related PDCCH configuration field has a predetermined value; and Based on determining that the SIB1 is the on-demand SI, the SIB1 request is sent.

5. The method according to claim 1, wherein: The information on whether the SIB1 is the on-demand SI is obtained based on the SSB subcarrier offset field in the master information block MIB carried by the PBCH.

6. The method according to claim 5, comprising the steps of: Determining whether the SIB1 is the on-demand SI based on that the SSB subcarrier offset field in the MIB has a predetermined value; as well as Based on determining that the SIB1 is the on-demand SI, the SIB1 request is sent.

7. The method according to claim 1, wherein: The step of sending the SIB1 request comprises the following steps: sending a random access channel RACH related to the SSB, and The SIB1 is related to a predetermined SSB index corresponding to the RACH.

8. The method according to claim 1, wherein: The step of sending the SIB1 request comprises the following steps: sending a random access channel RACH related to the SSB, and The SIB1 is related to all sent SSB indexes.

9. A user equipment UE configured to receive a downlink signal in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; Obtaining information about whether system information block 1 SIB1 is on-demand system information SI from the SSB; Based on the SIB1 being the on-demand SI, sending a SIB1 request; Requesting monitoring of a physical downlink control channel PDCCH related to the SIB1 based on the SIB1; and Based on detecting the PDCCH, a physical downlink shared channel PDSCH carrying the SIB1 is received.

10. A processing device in a wireless communication system, the processing device comprising: at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; Obtaining information about whether system information block 1 SIB1 is on-demand system information SI from the SSB; Based on the SIB1 being the on-demand SI, sending a SIB1 request; Requesting monitoring of a physical downlink control channel PDCCH related to the SIB1 based on the SIB1; and Based on detecting the PDCCH, a physical downlink shared channel PDSCH carrying the SIB1 is received.

11. A computer-readable storage medium configured to store at least one program including instructions, which when executed by at least one processor causes the at least one processor to perform operations for a user equipment UE, in, The operations include: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; Obtaining information about whether system information block 1 SIB1 is on-demand system information SI from the SSB; Based on the SIB1 being the on-demand SI, sending a SIB1 request; Requesting monitoring of a physical downlink control channel PDCCH related to the SIB1 based on the SIB1; and Based on detecting the PDCCH, a physical downlink shared channel PDSCH carrying the SIB1 is received.

12. A computer program stored on a computer-readable storage medium, the computer program comprising at least one program code, the at least one program code comprising instructions, the instructions when executed causing at least one processor to perform operations comprising: Detecting a synchronization signal block SSB on a cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH; Obtaining information about whether system information block 1 SIB1 is on-demand system information SI from the SSB; Based on the SIB1 being the on-demand SI, sending a SIB1 request; Requesting monitoring of a physical downlink control channel PDCCH related to the SIB1 based on the SIB1; and Based on detecting the PDCCH, a physical downlink shared channel PDSCH carrying the SIB1 is received.

13. A method for sending a downlink signal by a base station BS to a user equipment UE in a wireless communication system, the method comprising the following steps: Sending a synchronization signal block SSB on the cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH, and wherein the SSB includes information on whether a system information block 1 SIB1 is on-demand system information SI; Based on the SIB1 being the on-demand SI, receiving a SIB1 request; Requesting, based on the SIB1, to send a physical downlink control channel PDCCH related to the SIB1; and A physical downlink shared channel PDSCH carrying the SIB1 is sent.

14. A base station BS configured to send a downlink signal to a user equipment UE in a wireless communication system, the BS comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Sending a synchronization signal block SSB on the cell, wherein the SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH, and wherein the SSB includes information on whether a system information block 1 SIB1 is on-demand system information SI; Based on the SIB1 being the on-demand SI, receiving a SIB1 request; Requesting, based on the SIB1, to send a physical downlink control channel PDCCH related to the SIB1; and A physical downlink shared channel PDSCH carrying the SIB1 is sent.

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