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

Abstract

A UE may detect, on a first cell, a DCI format having a CRC scrambled by a P-RNTI, obtain information about a second cell based on the DCI format, and transmit a RACH in a RACH occasion in the second cell.

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. Accordingly, the data throughput required to be processed in a cellular network has rapidly increased. To meet such rapidly increasing data throughput, carrier aggregation technology or cognitive radio technology for effectively adopting more frequency bands, and multiple-input multiple-output (MIMO) technology or multi-base station (BS) cooperation technology for increasing the data capacity transmitted over limited frequency resources have been developed.

[0003] As more and more communication devices require greater communication capacity, enhanced mobile broadband (eMBB) communication relative to traditional radio access technology (RAT) is needed. In addition, massive machine-type communication (mMTC) that 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 communication.

[0004] Communication system design considering services / user equipment (UE) sensitive to reliability and latency is also being discussed. Introduction of next-generation RAT is being discussed considering eMBB communication, mMTC, ultra-reliable low-latency communication (URLLC), etc. Summary of the Invention

[0005] Technical Problem

[0006] As the number of services / user equipment (UE) that a network needs to support rapidly increases, the need for not only UE power saving but also network energy saving gradually increases.

[0007] An object of the present disclosure is to provide methods and procedures for network energy saving.

[0008] Another object of the present disclosure is to provide methods and procedures for transmitting a downlink signal to achieve network energy saving.

[0009] Another object of the present disclosure is to provide energy saving methods and procedures for a network, a base station (BS), and / or a user equipment (UE) by reducing the transmission of common signals / channels such as a synchronization signal block (SSB), a system information block 1 (SIB1), other system information (SI), and / or paging or adjusting their periodicity.

[0010] Objects to be achieved by 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.

[0011] Technical solution

[0012] In one aspect of the present disclosure, a method for a user equipment (UE) to transmit an uplink signal in a wireless communication system is provided herein. The method may include the following steps: performing physical downlink control channel (PDCCH) monitoring on a first cell based on a paging radio network temporary identifier (P-RNTI); detecting a downlink control information (DCI) format having a cyclic redundancy check (CRC) scrambled by the P-RNTI on the first cell; obtaining information about a second cell based on the DCI format; and transmitting a random access channel (RACH) on the second cell at a RACH opportunity.

[0013] In another aspect of the present disclosure, a UE configured to transmit an uplink 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 operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. The operations may include: performing PDCCH monitoring on a first cell based on the P-RNTI; detecting a DCI format having a CRC scrambled by the P-RNTI on the first cell; obtaining information about a second cell based on the DCI format; and transmitting a RACH on the second cell at a RACH opportunity.

[0014] 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 operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. The operations may include: performing PDCCH monitoring on a first cell based on the P-RNTI; detecting a DCI format having a CRC scrambled by the P-RNTI on the first cell; obtaining information about a second cell based on the DCI format; and transmitting a RACH on the second cell at a RACH opportunity.

[0015] In another aspect of the present disclosure, a method for a base station (BS) to receive an uplink signal from a UE in a wireless communication system is provided herein. The method may include the following steps: transmitting a PDCCH carrying a DCI format having a CRC scrambled by the P-RNTI on a first cell; and receiving a RACH from the UE on a second cell at a RACH opportunity based on the DCI format.

[0016] In another aspect of the present disclosure, there is provided a BS configured to receive an uplink signal from a UE in a wireless communication system. The BS includes: at least one transceiver; at least one processor; and 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. The operations may include: transmitting a PDCCH carrying DCI format with a CRC scrambled by a P-RNTI on a first cell; and receiving a RACH from the UE on a second cell at a RACH occasion based on the DCI format.

[0017] In various aspects of the present disclosure, information about the second cell may be included in the DCI format.

[0018] In various aspects of the present disclosure, a physical downlink shared channel (PDSCH) carrying a paging message including an identifier (ID) of the UE based on the DCI format may be decoded and transmitted.

[0019] In various aspects of the present disclosure, the paging message may include information about the second cell and information about the RACH occasion.

[0020] In various aspects of the present disclosure, the DCI format may include information about a third cell for transmitting system information block 1 (SIB1).

[0021] In various aspects of the present disclosure, SIB1 may be received or transmitted on the third cell.

[0022] In various aspects of the present disclosure, information about the second cell may be included in SIB1.

[0023] In various aspects of the present disclosure, information about the second cell may be included in other system information scheduled by SIB1.

[0024] The above solutions are only part of the examples of the present disclosure, and those skilled in the art can derive and understand various examples in which the technical features of the present disclosure are incorporated from the following detailed description.

[0025] Beneficial effects

[0026] According to the implementation of the present disclosure, energy-saving methods and procedures for a network, a base station (BS), and / or a user equipment (UE) may be provided.

[0027] According to the implementation of the present disclosure, methods and procedures for transmitting downlink signals may be provided to achieve energy saving for a network, a BS, and / or a UE.

[0028] According to an implementation of the present disclosure, an energy-saving method and process for a network, a base station (BS), and / or a user equipment (UE) can be provided by reducing the transmission of a common signal / channel or adjusting its transmission periodicity.

[0029] The effects according to the present disclosure are not limited to those specifically described above, and those skilled in the art related to the present disclosure will more clearly understand other effects not described herein from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are included to provide a further understanding of the present disclosure, and the drawings illustrate examples of implementations of the present disclosure and are used together with the detailed description to explain the implementations of the present disclosure:

[0031] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown;

[0032] Figure 2 A block diagram showing an example of a communication device capable of executing the method according to the present disclosure;

[0033] Figure 3 Another example of a wireless device capable of executing an implementation of the present disclosure is shown;

[0034] Figure 4 An example of a frame structure used in a wireless communication system based on the 3rd Generation Partnership Project (3GPP) is shown;

[0035] Figure 5 A resource grid of a time slot is shown;

[0036] Figure 6 An example of physical channels in a communication system based on the 3rd Generation Partnership Project (3GPP-based) as an exemplary wireless communication system and a signal transmission / reception process using these physical channels are shown;

[0037] Figure 7 A system information (SI) acquisition process is shown;

[0038] Figure 8 A random access process applicable to an implementation of the present disclosure is shown;

[0039] Figure 9 Examples of PDSCH time-domain resource assignment via PDCCH and examples of PUSCH time-domain resource assignment via PDCCH are shown;

[0040] Figure 10 An SSB and CORESET multiplexing pattern is shown;

[0041] Figure 11 A discontinuous reception (DRX) operation applicable to an implementation of the present disclosure is shown;

[0042] Figure 12 Illustrates the cases of configuring long DRX cycles and short DRX cycles;

[0043] Figure 13 Illustrates the transmission of System Information Block 1 (SIB1) in a 3GPP-based system;

[0044] Figure 14 Illustrates the process of transmitting or receiving common signals / channels according to some implementations of the present disclosure;

[0045] Figure 15 Illustrates the process of DL / UL signal reception / transmission of a UE according to some implementations of the present disclosure;

[0046] Figure 16 Illustrates the process of DL / UL signal transmission / reception of a BS according to some implementations of the present disclosure. Detailed implementation manners

[0047] Hereinafter, implementations according to the present disclosure will be described in detail with reference to the drawings. The detailed description given below with reference to the drawings is intended to illustrate exemplary implementations of the present disclosure, rather than showing all the implementations that can be realized 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.

[0048] In some cases, known structures and devices may be omitted or may be shown in block diagram form, so as to focus on the important features of the structures and devices and 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.

[0049] The following techniques, apparatuses, and systems can be applied to various wireless multi-access systems. For example, a multi-access system can include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, a Multi-Carrier Frequency Division Multiple Access (MC-FDMA) system, 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 Rates for GSM Evolution (EDGE) (i.e., GERAN), etc. OFDMA can be specifically implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS), and the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of E-UMTS that uses E-UTRA. 3GPP LTE employs OFDMA on the downlink (DL) and SC-FDMA on the uplink (UL). LTE-Advanced (LTE-A) is an evolved version of 3GPP LTE.

[0050] For ease of description, the description will be given under the assumption that the present disclosure is applied to LTE and / or New Radio Access Technology (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 the 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.

[0051] For terms and techniques not detailed among the terms and techniques used in the present disclosure, reference can be made to 3GPP-based standard specifications (e.g., 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.304, 3GPP TS 38.331, etc.).

[0052] In an example of the present disclosure described later, if a device "assumes" something, this may mean that the channel transmission entity transmits the channel in accordance with the corresponding "assumption". This may also mean that the channel receiving entity receives or decodes the channel in a form that conforms to the "assumption" on the premise that the channel is transmitted in accordance with the "assumption".

[0053] In the present disclosure, a user equipment (UE) may be fixed or mobile. Each of various devices that communicate with a base station (BS) to transmit and / or receive user data and / or control information 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. Hereinafter, for convenience of description, regardless of the type or version of the communication technology, an NB, an eNB, or a gNB will be referred to as a BS.

[0054] In the present disclosure, a node refers to a fixed point that can transmit / receive radio signals 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, an NB, an eNB, a pico cell eNB (PeNB), a home eNB (HeNB), a repeater, a transponder, etc. may be nodes. In addition, a node may not be a BS. For example, a radio remote head (RRH) or a radio remote unit (RRU) may be a node. Generally, an RRH and an RRU have a lower power level than that of a BS. Since an RRH or an RRU (hereinafter, RRH / RRU) is usually connected to a BS through a dedicated line such as an optical cable, the cooperative communication according to the RRH / RRU and the BS can be performed more smoothly than the cooperative communication according to a BS connected through a wireless link. At least one antenna is installed per node. The antenna may refer to a physical antenna port or may refer to a virtual antenna or an antenna group. A node may also be referred to as a point.

[0055] In the present disclosure, a cell refers to a specific geographical area where one or more nodes provide communication services. Thus, in the present disclosure, communication with a specific cell may mean communication with a BS or node that provides communication services to the 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 serving cell. In addition, the channel state / quality of a specific cell refers to the channel state / quality of the channel or communication link generated between the BS or node that provides communication services to the specific cell and the UE. In a 3GPP-based communication system, a UE may use a cell-specific reference signal (CRS) transmitted on a CRS resource and / or a channel state information reference signal (CSI-RS) transmitted on a CSI-RS resource (assigned to a specific node by an antenna port of a specific node) to measure the DL channel state from the specific node.

[0056] A 3GPP-based communication system uses the concept of a cell to manage radio resources and differentiates the cell related to radio resources from the cell of a geographical area.

[0057] The "cell" of a geographical area can be understood as the coverage range where a node can use a carrier to provide services, and the "cell" of radio resources is associated with the bandwidth (BW) that is the frequency range configured by the carrier. Since the DL coverage range (the range where a node can transmit an effective signal) and the UL coverage range (the range where a node can receive an effective signal from a UE) depend on the carrier that carries the signal, the coverage range of a node can also be associated with the coverage range of the "cell" of the radio resources used by the node. Thus, the term "cell" can be used to sometimes indicate the service coverage range of a node, at other times indicate radio resources, or at other times indicate the range where a signal using radio resources can reach with an effective intensity.

[0058] In the 3GPP communication standard, the concept of a cell is used to manage radio resources. A "cell" associated with radio resources 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 can be configured by only DL resources or by a combination of DL resources and UL resources. If carrier aggregation is supported, the link between the carrier frequencies of the DL resources (or DL CCs) and the UL resources (or UL CCs) can be indicated by system information. For example, the combination of DL resources and UL resources can be indicated by a link in System Information Block Type 2 (SIB2). In this case, the carrier frequency can 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 / re - establishment / handover, one serving cell provides non - access stratum (NAS) mobility information. During RRC connection re - establishment / handover, one serving cell provides security input. This cell is called the primary cell (Pcell). The Pcell refers to the cell operating on the primary frequency where the UE performs the initial connection establishment process or initiates the connection re - establishment process. Depending on the UE's capabilities, secondary cells (Scells) can be configured to form a set of serving cells together with the Pcell. Scells can be configured after the completion of RRC connection establishment and are used to provide additional radio resources in addition to the resources of a 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 (DLSCC), and the carrier corresponding to the Scell on the UL is called the Uplink Secondary CC (UL SCC).

[0059] In dual connectivity (DC) operation, the term special cell (SpCell) refers to the Pcell of the master cell group (MCG) or the primary secondary cell (Pcell) of the secondary cell group (SCG). The SpCell supports PUCCH transmission and contention-based random access and is always enabled. The MCG is a set of serving cells associated with a master node (e.g., BS) and includes the SpCell (Pcell) and optionally one or more Scells. For a UE configured with DC, the SCG is a subset of serving cells associated with a secondary node and includes the PSCell and zero or more Scells. The PSCell is the primary Scell of the SCG. For a UE in the RRC_CONNECTED state that is not configured with CA or DC, there is only one serving cell that includes only the Pcell. For a UE in the RRC_CONNECTED state that is configured with CA or DC, the term serving cell refers to the set of cells that includes the SpCell and all Scells. In DC, two medium access control (MAC) entities are configured for the UE, i.e., one MAC entity for the MCG and one MAC entity for the SCG.

[0060] For a UE configured with CA but not configured with DC, a Pcell PUCCH group (also referred to as the primary PUCCH group) that includes the Pcell and zero or more Scells and a Scell PUCCH group (also referred to as the secondary PUCCH group) that includes only Scells can be configured. For a Scell, a Scell (hereinafter, PUCCH Scell) that transmits the PUCCH associated with the corresponding cell can be configured. The Scell indicating the PUCCH Scell belongs to the Scell PUCCH group (i.e., the secondary PUCCH group) and PUCCH transmission of relevant uplink control information (UCI) is performed on the PUCCH Scell. If no PUCCH Scell is indicated for the Scell or the cell indicating PUCCH transmission for the Scell is the Pcell, the Scell belongs to the Pcell PUCCH group (i.e., the primary PUCCH group) and PUCCH transmission of relevant UCI is performed on the Pcell. Hereinafter, if the UE is configured with an SCG and some implementations of the present disclosure related to the PUCCH are applied to the SCG, the primary cell may refer to the PSCell of the SCG. If the UE is configured with a PUCCH Scell and some implementations of the present disclosure related to the PUCCH are applied to the secondary PUCCH group, the primary cell may refer to the PUCCH Scell of the secondary PUCCH group.

[0061] In a wireless communication system, a UE receives information from a BS on the DL, and the UE transmits information to the BS on the 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 / usage of the information transmitted and / or received by the UE and the BS.

[0062] The communication standards based on 3GPP define DL physical channels corresponding to resource elements carrying information from higher layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information from higher layers. For example, the 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 the Reference Signal (RS) and Synchronization Signal are defined as DL physical signals. The RS (also referred to as a pilot) represents a signal with a predefined special waveform known to both the BS and the UE. For example, the Demodulation Reference Signal (DMRS), Channel State Information RS (CSI-RS), Positioning Reference Signal (PRS), etc. are defined as DL RSs. The communication standards based on 3GPP define UL physical channels corresponding to resource elements carrying information from higher layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information from higher layers. For example, the Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), and Physical Random Access Channel (PRACH) are defined as UL physical channels, and the DMRS for UL control / data signals, the Sounding Reference Signal (SRS) for UL channel measurement, etc. are defined.

[0063] In the present disclosure, the PDCCH refers to a set of time-frequency resources (e.g., resource elements (REs)) carrying Downlink Control Information (DCI), and the PDSCH refers to a set of time-frequency resources carrying DL data. The PUCCH, PUSCH, and PRACH respectively 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. In the following description, "UE transmits / receives PUCCH / PUSCH / PRACH" is used with the same meaning as the UE transmits / receives UCI / UL data / random access signals on or through the PUCCH / PUSCH / PRACH, respectively. Additionally, "BS transmits / receives PBCH / PDCCH / PDSCH" is used with the same meaning as the BS transmits broadcast information / DCI / DL data on or through the PBCH / PDCCH / PDSCH, respectively.

[0064] In the present disclosure, radio resources (e.g., time-frequency resources) scheduled or configured by the BS for the UE to transmit or receive PUCCH / PUSCH / PDSCH may be referred to as PUCCH / PUSCH / PDSCH resources.

[0065] Since a communication device receives synchronization signals (SS), DMRS, CSI-RS, PRS, PBCH, PDCCH, PDSCH, PUSCH, and / or PUCCH in the form of radio signals on a cell, the communication device may not select and receive a radio signal including only a specific physical channel or a specific physical signal through a radio frequency (RF) receiver, or may not select and receive a radio signal without a specific physical channel or a specific physical signal through the RF receiver. In actual operation, the communication device receives a radio signal on a cell via the RF receiver, converts the radio signal, which is an RF band signal, into a baseband signal, and then decodes the physical signal and / or physical channel in the baseband signal using one or more processors. Therefore, in some implementations of the present disclosure, not receiving a physical signal and / or a physical channel may mean that the communication device does not attempt to recover the physical signal and / or physical channel from the radio signal, e.g., does not attempt to decode the physical signal and / or physical channel, rather than the communication device not actually receiving the radio signal including the corresponding physical signal and / or physical channel.

[0066] As more and more communication devices require greater communication capacity, enhanced mobile broadband (eMBB) communication relative to traditional radio access technologies (RAT) is needed. 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 communication. Furthermore, the design of a communication system considering services / UEs sensitive to reliability and latency is also being discussed. Considering eMBB communication, mMTC, ultra-reliable low-latency communication (URLLC), etc., the introduction of a next-generation RAT is being discussed. Currently, in 3GPP, research on the next-generation mobile communication system after the EPC is underway. In the present 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.

[0067] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown. Refer to 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 can be referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a household appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle may include a vehicle with wireless communication capabilities, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, the 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 can be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a TV, a smart phone, a computer, a wearable device, a household appliance device, a digital sign, a vehicle, a robot, etc. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), and a computer (e.g., a notebook). The household appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include sensors and smart meters. For example, the BS and the network may also be implemented as wireless devices, and a specific wireless device may operate as a BS / network node relative to another wireless device.

[0068] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. 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 through the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0069] Wireless communications / connections 150a and 150b can be established between wireless devices 100a to 100f and BS 200, and between wireless devices 100a to 100f. Here, wireless communications / connections such as UL / DL communication 150a and sidelink communication 150b (or device-to-device (D2D) communication) can be established via various RATs (e.g., 5G NR). The wireless devices and the BS / wireless devices can send / receive radio signals to / from each other via wireless communications / connections 150a and 150b. To this end, at least a part of various configuration information configuration processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for sending / receiving radio signals can be performed based on various proposals of the present disclosure.

[0070] Figure 2 is a block diagram showing an example of a communication device capable of performing the method according to the present disclosure. Referring to Figure 2 , the first wireless device 100 and the second wireless device 200 can send and / or receive radio signals via various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} can correspond to Figure 1 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x} of

[0071] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the functions, processes, and / or methods described / proposed below. For example, the processor 102 may process the information within the memory 104 to generate first information / signals, and then transmit radio signals including the first information / signals through the transceiver 106. The processor 102 may receive radio signals including second information / signals through the transceiver 106, and then store the 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 some or all of the processes controlled by the processor 102 or store software code including commands for executing the processes and / or methods described / proposed below. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0072] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the functions, processes, and / or methods described / proposed below. For example, the processor 202 may process the information within the memory 204 to generate a third information / signal, and then transmit a radio signal including the third information / signal through the transceiver 206. The processor 202 may receive a radio signal including a fourth information / signal through the transceiver 206, and then store the information obtained by processing the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 may execute some or all of the processes controlled by the processor 202 or store software code including commands for executing the processes and / or methods described / proposed below. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with the RF unit. In the present disclosure, the wireless device may represent a communication modem / circuit / chip.

[0073] The wireless communication technologies implemented in the wireless devices 100 and 200 of the present disclosure may include NarrowBand Internet of Things for low-power communication, as well as LTE, NR, and 6G. For example, the NB-IoT technology may be an example of a Low-Power Wide-Area Network (LPWAN) technology and is implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. However, the NB-IoT technology is not limited to the above names. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices XXX and YYY of the present disclosure may perform communication based on the LTE-M technology. For example, the LTE-M technology may be an example of an LPWAN technology and is known by various names including enhanced machine-type communication (eMTC). For example, the LTE-M technology may be implemented according to at least one of the following various standards: 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine-type communication, and / or 7) LTE M, etc., but the LTE-M technology is not limited to the above names. Additionally or alternatively, considering low-power communication, the wireless communication technologies implemented in the wireless devices XXX and YYY of the present disclosure may include at least one of ZigBee, Bluetooth, and LPWAN, but the wireless communication technologies are not limited to the above names. For example, the ZigBee technology may create a personal area network (PAN) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and the ZigBee technology may be known by various names.

[0074] In the following, the hardware components of 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 (such as functional layers such as a physical (PHY) layer, a media 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, processes, 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, processes, proposals, and / or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate signals (such as baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, processes, proposals, and / or methods disclosed in the present disclosure, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (such as baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the functions, processes, proposals, and / or methods disclosed in the present disclosure.

[0075] One or more processors 102 and 202 may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. 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 processor 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. The firmware or software configured to execute 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.

[0076] 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, code, 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 combinations thereof. One or more memories 104 and 204 may be located inside and / or outside 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 through various techniques such as wired or wireless connections.

[0077] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the methods and / or operation flowcharts of the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the functions, processes, proposals, methods, and / or operation flowcharts 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 execute control such that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may execute control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals 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 functions, processes, proposals, methods, and / or operation flowcharts 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 the received radio signals / channels, etc. from RF band signals to baseband signals in order to process the 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 the 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 transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0078] Figure 3 Another example of a wireless device capable of implementing the present disclosure is shown. Referring to Figure 3 , the wireless devices 100 and 200 may correspond to Figure 2 the wireless devices 100 and 200, and 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 additional components 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, transceiver 114 may include Figure 2 one or more transceivers 106 and 206 and / or one or more antennas 108 and 208. Control unit 120 is electrically connected to communication unit 110, memory 130, and additional components 140, and controls the overall operation of the wireless device. For example, control unit 120 may control the electrical / mechanical operations of the wireless device based on programs / codes / commands / information stored in memory unit 130. Control unit 120 may send information stored in memory unit 130 to the outside (e.g., other communication devices) via communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via communication unit 110 in memory unit 130 through a wireless / wired interface.

[0079] Additional components 140 may be configured differently according to the type of wireless device. For example, additional components 140 may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented as (but not limited to) a robot ( Figure 1 100a), a vehicle ( Figure 1 100b-1 and 100b-2), an XR device ( Figure 1 100c), a handheld device ( Figure 1 100d), a household appliance ( Figure 1 100e), an IoT device ( Figure 1 100f), a digital broadcast UE, a holographic device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device ( Figure 1 400), a BS ( Figure 1 200), a network node, etc. The wireless device may be used at a mobile or fixed location according to usage / services.

[0080] In Figure 3In this case, various elements, components, units / parts, and / or modules in wireless devices 100 and 200 can all be connected to each other through a wired interface, or at least a part of them can be wirelessly connected through communication unit 110. For example, in each of wireless devices 100 and 200, control unit 120 and communication unit 110 can be wired-connected, and control unit 120 and the first units (e.g., 130 and 140) can be wirelessly connected through communication unit 110. Each element, component, unit / part, and / or module within wireless devices 100 and 200 can also include one or more elements. For example, control unit 120 can be configured by a set of one or more processors. As an example, control unit 120 can be configured by a set 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, memory 130 can be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a temporary memory, a non-temporary memory, and / or a combination thereof.

[0081] In this disclosure, at least one memory (e.g., 104 or 204) can store instructions or programs, and when these instructions or programs are executed, they can cause at least one processor operatively connected to the at least one memory to perform operations according to some embodiments or implementations of this disclosure.

[0082] In this disclosure, a computer-readable (non-temporary) storage medium can store at least one instruction or program, and when the at least one instruction or program is executed by at least one processor, it can cause the at least one processor to perform operations according to some embodiments or implementations of this disclosure.

[0083] In this disclosure, a processing device or apparatus can 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 can store instructions or programs, and when these instructions or programs are executed, they can cause at least one processor operatively connected to at least one memory to perform operations according to some embodiments or implementations of this disclosure.

[0084] In this disclosure, a computer program can include program code stored on at least one computer-readable (non-temporary) storage medium, and when it is executed, it is configured to perform operations according to some implementations of this disclosure or cause at least one processor to perform operations according to some implementations of this disclosure. The computer program can be provided in the form of a computer program product. The computer program product can include at least one computer-readable (non-temporary) storage medium.

[0085] The communication device of the present disclosure includes: at least one processor; and at least one computer memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations in accordance with examples of the present disclosure described later.

[0086] Figure 4 An example of a frame structure used in a 3GPP-based wireless communication system is shown.

[0087] Figure 4 The frame structure is only exemplary, and the number of subframes, the number of time slots, and the number of symbols in a frame can be changed differently. In the NR system, different sets of OFDM parameters (e.g., subcarrier spacing (SCS)) can 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)) can be configured differently for the aggregated cells. Here, a symbol can include an OFDM symbol (or cyclic prefix - OFDM (CP - OFDM) symbol) and an SC - FDMA symbol (or discrete Fourier transform - spread - OFDM (DFT - s - OFDM) symbol). In the present disclosure, a symbol, an OFDM - based symbol, an OFDM symbol, a CP - OFDM symbol, and a DFT - s - OFDM symbol can be used interchangeably.

[0088] Refer to Figure 4 , in the NR system, UL transmissions and DL transmissions are organized into frames. Each frame has a duration of T f =(Δf max *N f / 100)*T c =10 ms and is divided into two half - frames each of 5 ms. The basic time unit of NR is T c =1 / (Δf max *N f ), where Δf max =480*10 3 Hz and N f =4096. As a reference, the basic time unit of LTE is T s =1 / (Δf ref *N f,ref ), where Δf ref =15*10 3 Hz and N f,ref =2048. T c and T f have a relationship with a constant κ = T c / T f =64. Each half - frame includes 5 subframes, and the duration of a single subframe is T sfis 1 ms. A subframe is further divided into time slots, and the number of time slots in a subframe depends on the subcarrier spacing. Each time slot includes 14 or 12 OFDM symbols based on the cyclic prefix. In normal CP, each time slot includes 14 OFDM symbols, and in extended CP, each time slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing △f = 2 u *15 kHz. 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 ).

[0089] [Table 1]

[0090] 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

[0091] The following table shows the number of OFDM symbols per time slot, the number of time slots per frame, and the number of time slots per subframe according to the subcarrier spacing △f = 2 u *15 kHz.

[0092] [Table 2]

[0093] u <![CDATA[N slot symb > <![CDATA[N frame,u slot > <![CDATA[N subframe,u slot > 2 12 40 4

[0094] For the subcarrier spacing configuration u, the time slots can be indexed in ascending order within a subframe as follows: n u s ∈ {0,..., n subframe ,u slot - 1}, and within a frame as follows: n u s,f ∈ {0,..., n frame,u slot - 1}

[0095] Figure 5 shows the resource grid of the time slots. A time slot includes a plurality (e.g., 14 or 12) of symbols in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, starting from the common resource block (CRB) N start,u grid indicated by the higher layer signaling (e.g., RRC signaling), a resource grid of N size,u grid,x * N RB sc subcarriers and N subframe,u symb OFDM symbols is defined, where N size,u grid,xis the number of resource blocks (RBs) in the resource grid, and for the downlink, the subscript x is DL, and for the uplink it is UL. N RB sc is the number of subcarriers per RB. In a 3GPP-based wireless communication system, N RB sc is typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission link (DL or UL), there is a resource grid. The carrier bandwidth N of subcarrier spacing configuration u is given to the UE by 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 common resource blocks (CRBs) and physical resource blocks (PRBs). For subcarrier spacing configuration u, the CRBs are numbered upwards from 0 in the frequency domain. The center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u is equal to "Point A" which serves as the common reference point for the RB grid. The PRBs for subcarrier spacing configuration u are defined within a bandwidth part (BWP) and are numbered from 0 to N size,u BWP,i -1, where i is the number of BWPs. The PRB n in BWPi PRB is related to CRB n u CRB by n u PRB = n u CRB + N size,u BWP,i where N size BWP,i is the CRB at which the BWP starts relative to CRB 0. A BWP includes a plurality of consecutive RBs in the frequency domain. For example, a BWP can be a subset of adjacent CRBs defined for a given parameter set u in BWP i on a given carrier i . A carrier can include up to N (e.g., 5) BWPs. The UE can be configured to have one or more BWPs on a given component carrier. Data communication is performed through the enabled BWP, and among the BWPs configured only for the UE on the component carrier, a predetermined number of BWPs (e.g., one BWP) can be active.

[0096] For each serving cell in a 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 an 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) the CRB N indicated under the assumption of N start BWP＝ 275 that indicates the offset RB set and the length L RB as the RRC parameter locationAndBandwidth of the resource indicator value (RIV) provides the CRB N start BWP = O carrier + RB start and the number N of adjacent RBs size BWP = L RB , and the value O provided by the RRC parameter offsetToCarrier for the SCS carrier ; the index in the set of DL BWPs or UL BWPs; the set of BWP common parameters; and the set of BWP dedicated parameters.

[0097] Virtual resource blocks (VRBs) may be defined within a BWP and indexed from 0 to N size,u BWP,i - 1, where i represents the BWP number. The 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.

[0098] NR frequency bands are defined as two types of frequency ranges, namely, FR1 and FR2. FR2 is also known as millimeter wave (mmW). The following table shows the frequency ranges over which NR can operate.

[0099] [Table 3]

[0100] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410 MHz - 7125 MHz 15, 30, 60 kHz FR2 24250 MHz - 52600 MHz 60, 120, 240 kHz

[0101] Figure 6 is a diagram showing physical channels and signal transmission / reception processes using these physical channels in a 3GPP - based communication system as an exemplary wireless communication system.

[0102] 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 camp on and performs an initial cell search, which involves synchronization with the BS in the cell (S11). For the initial cell search, the UE receives a Synchronization Signal Block (SSB) (also referred to as an SSB / PBCH block) from the BS. The SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as the cell identifier (ID). The UE can obtain the broadcast information in the cell based on the PBCH. The UE can receive a DL reference signal (RS) during the initial cell search process to monitor the DL channel state.

[0103] After the initial cell search, the UE can camp on the cell. Subsequently, the UE can monitor the PDCCH in the cell and obtain more specific system information by receiving the PDSCH based on the DCI carried on the PDCCH (S12).

[0104] Subsequently, to complete the connection with the BS, the UE can perform a random access procedure (S13 to S16). During the random access procedure, for example, the UE can send a preamble on the PRACH (S13) and receive the PDCCH and a random access response (RAR) for the preamble on the PDSCH corresponding to the PDCCH (S14). When the UE fails to receive the RAR directed to the UE, the UE can attempt to retransmit the preamble. In the case of contention-based random access, the UE can send the PUSCH based on the UL resource allocation included in the RAR (S15), and perform a contention resolution procedure including the reception of the PDCCH and the PDSCH corresponding to the PDCCH (S16).

[0105] After the above process, the UE can receive the PDCCH / PDSCH from the BS during the general UL / DL signal transmission process (S17) and send the PUSCH / PUCCH to the BS (S18). 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 a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), and / or a Rank Indicator (RI). Generally, UCI is sent on the PUCCH. However, when the control information and data should be sent simultaneously, the control information can be sent on the PUSCH. Additionally, when receiving a request / command from the network, the UE can send UCI non-periodically on the PUSCH.

[0106] Figure 7Shows the system information (SI) acquisition process. The UE can obtain 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 the state where the UE has established an RRC connection with the network. RRC_IDLE refers to the state where the UE is not registered in a specific cell and has not received the AS context and other information from the network. RRC_INACTIVE refers to the state where the UE remains in a state called CM-CONNECTED, where the UE has a signaling connection with the core network for connection management (CM) and can move within the area defined by the radio access network (RAN) (e.g., BS) without notifying the RAN. CM_CONNECTED refers to the state where the UE has a NAS signaling connection with the core network. CM_IDLE refers to the state where the UE does not have a NAS signaling connection.

[0107] In a 3GPP-based system, the system information (SI) can be classified into a master information block (MIB) and multiple system information blocks (SIBs). The MIB and the multiple SIBs are divided into minimum system information (SI) and other SI, where the minimum SI consists of the MIB and system information block 1 (SIB1) and includes the basic information required for initial access and the information for obtaining any other SI. SIB1 can be referred to as the remaining minimum system information (RMSI). Details are as follows.

[0108] - The MIB is always sent on the BCH with a period of 80 ms and repeated within 80 ms. The MIB includes information / parameters related to the reception of SIB1 and is sent via the PBCH in the SSB. During initial cell selection, the UE assumes that the half-frame including the SSB is repeated with a period of 20 ms. 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 type of PDCCH search space and is used to send the PDCCH for scheduling SI messages. When there is a Type0-PDCCH common search space, the UE can determine (i) the multiple consecutive RBs and one or more consecutive symbols included in the CORESET and (ii) the PDCCH occasion (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 the SSB / SIB1 exists and information about the frequency range where the SSB / SIB1 does not exist.

[0109] -SIB1 is transmitted periodically on the downlink shared channel (DL-SCH) with a period of 160 ms and a variable transmission repetition period within 160 ms. The default transmission repetition period of SIB1 is 20 ms, but the actual transmission repetition period depends on the network implementation. SIB1 includes information about the availability and scheduling of the remaining SI messages (hereinafter referred to as SIBx, where x is an integer greater than or equal to 2) (e.g., transmission period and SI window size). For example, SIB1 may indicate whether SIBx is broadcast periodically or provided on demand in response to a UE request. When SIBx is provided on demand, SIB1 may include information required for the UE to perform an SI request. SIB1 is a cell-specific SIB. The PDCCH scheduling SIB1 is transmitted in the Type0-PDCCH common search space, and SIB1 is transmitted via the PDSCH indicated by the PDCCH.

[0110] -SIBx is included in the SI message and transmitted via the PDSCH. Each SI message is transmitted within a periodically occurring time window (i.e., SI window).

[0111] Figure 8 Shows a random access procedure applicable to the implementation of the present disclosure. Specifically, Figure 8 (a) of shows a 4-step random access procedure, Figure 8 (b) of shows a 2-step random access procedure.

[0112] The random access procedure can be used for various purposes, including initial access, UL synchronization adjustment, resource allocation, handover, 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 handover, DL data arrival 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 transmit the same RA preamble simultaneously, and a subsequent contention resolution process is required. In the dedicated random access procedure, the UE uses the RA preamble uniquely allocated by the BS for the UE. Therefore, the UE can perform the random access procedure without conflicting with other UEs.

[0113] Referring to Figure 8 (a) of, the contention-based random access procedure includes the following four steps. The messages transmitted in steps 1 to 4 may be referred to as message 1 (Msg1) to message 4 (Msg4), respectively.

[0114] -Step 1: The UE transmits an RA preamble on the PRACH.

[0115] -Step 2: The UE receives an RAR from the BS on the PDSCH.

[0116] - Step 3: The UE sends UL data to the BS on the PUSCH. The UL data includes layer 2 (L2) / layer 3 (L3) messages.

[0117] - Step 4: The UE receives a contention resolution message from the BS on the PDSCH.

[0118] The UE can receive random access information from the BS in the system information. For example, information about the RACH occasion associated with the SSB on the cell can be provided in the system information. The UE can select the SSB among the SSBs received on the cell for which the reference signal received power (RSRP) based on the SSB measurement exceeds a threshold. Then, the UE can send a RA preamble on the PRACH associated with the selected SSB. For example, when the UE needs to perform random access, the UE sends Msg1 (e.g., the preamble) to the BS on the PRACH. The BS can identify each RA preamble by the time / frequency resource (hereinafter, RA occasion (RO)) carrying the RA preamble and the preamble index (PI). When receiving the RA preamble from the UE, the BS sends a RAR message to the UE on the PDSCH. To receive the RAR message, the UE monitors the L1 / L2 control channel (e.g., PDCCH) with a cyclic redundancy check (CRC) masked by the random access - radio network temporary identifier (RA - RNTI) within a pre - configured time window (e.g., ra - ResponseWindow), including the scheduling information for the RAR message. When receiving the scheduling information on the PDCCH masked by the RA - RNTI, the UE can receive the RAR message on the PDSCH indicated by the scheduling information. Then, the UE checks whether there is a RAR pointing to the UE in the RAR message. It can be determined whether there is a RAR pointing to the UE 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 can be the same as the RAPID. The RAR includes the index of the corresponding RA preamble, the timing offset information for UL synchronization (e.g., timing advance command (TAC)), the UL scheduling information for Msg3 transmission (e.g., UL grant), and the UE temporary identification information (e.g., temporary - C - RNTI (TC - RNTI)). When receiving the RAR, the UE sends Msg3 on the PUSCH according to the UL scheduling information and the timing offset value in the RAR. Msg3 can include the ID of the UE (or global ID). In addition, Msg3 can include the RRC connection request - related information for initial access to the network (e.g., RRCSetupRequest message). 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 changes to C - RNTI. Msg4 can 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 can determine that the contention resolution fails and re - transmit Msg3.

[0119] The dedicated random access procedure includes the following three steps. The messages sent in steps 0 to 2 may be referred to as Msg0 to Msg2, respectively. The BS may trigger the dedicated random access procedure through a PDCCH (hereinafter referred to as a PDCCH command) that serves the purpose of the commanded RA preamble transmission.

[0120] - Step 0: The BS allocates an RA preamble to the UE through dedicated signaling.

[0121] - Step 1: The UE sends an RA preamble on the PRACH.

[0122] - Step 2: The UE receives an RAR from the BS on the PDSCH.

[0123] Steps 1 and 2 of the dedicated random access procedure may be the same as steps 1 and 2 of the contention-based random access procedure.

[0124] The NR system may require lower latency than traditional systems. Especially for latency-sensitive services such as URLLC, a 4-step random access procedure may not be preferred. Various scenarios in the NR system may require a low-latency random access procedure. When the implementation of the present disclosure is implemented together with the random access procedure, the implementation of the present disclosure may be implemented together with the following 2-step random access procedure to reduce the latency involved in the random access procedure.

[0125] Refer to Figure 8 In (b) of, 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 the transmission of an RA preamble on the PRACH and the transmission of a UL payload on the PUSCH. In MsgA transmission, the PRACH and the PUSCH may be sent in time-division multiplexing (TDM). Alternatively, in MsgA transmission, the PRACH and the PUSCH may be sent in frequency-division multiplexing (FDM).

[0126] Upon receiving MsgA, the BS may send MsgB to the UE. MsgB may include an RAR for the UE.

[0127] An RRC connection request related message (e.g., RRC Setup Request message) requesting to establish 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., RRC Setup message). In contrast, an RRC connection request related message (e.g., RRC Setup Request message) may be sent on the PUSCH based on the UL grant in MsgB. In this case, RRC connection related information related to the RRC connection request (e.g., RRC Setup message) may be sent on the PDSCH associated with the PUSCH transmission after the PUSCH transmission based on MsgB.

[0128] Hereinafter, the physical channels that can be used in a 3GPP-based wireless communication system will be described in detail.

[0129] The PDCCH carries DCI. For example, the PDCCH (i.e., DCI) carries information on the transmission format and resource allocation of the downlink shared channel (DL-SCH), information on the resource allocation of the uplink shared channel (UL-SCH), paging information on the paging channel (PCH), system information on the DL-SCH, control messages for layers higher than the physical layer (hereinafter, higher layers) in the UE / BS protocol stack (e.g., random access response (RAR) sent on the PDSCH) resource allocation information, transmit power control commands, information on the enabling / disabling of configured scheduling (CS), etc. The DCI including the resource allocation information of the DL-SCH is called PDSCH scheduling DCI, and the DCI including the resource allocation information of the UL-SCH is called PUSCH scheduling DCI. The 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 use of the PDCCH. For example, if the PDCCH is for a specific UE, the CRS is masked with the UE identifier (e.g., cell-RNTI (C-RNTI)). If the PDCCH is for a paging message, the CRC is masked with the paging RNTI (P-RNTI). If the PDCCH is for system information (e.g., system information block (SIB)), the CRC is masked with the system information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the random access-RNTI (RA-RNTI).

[0130] 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) may allow the PDCCH on a serving cell to schedule resources on another serving cell. When the PDSCH on a serving cell schedules the PDSCH or PUSCH on the serving cell itself, it is called self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide the UE with information about the cell that schedules the serving cell. 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 itself. 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 for the serving cell. In the present disclosure, the cell that carries the PDCCH is called the scheduling cell, and the cell on which the transmission of the PUSCH or PDSCH is scheduled by the DCI included in the PDCCH (i.e., the cell that carries the PUSCH or PDSCH scheduled by the PDCCH) is called the scheduled cell.

[0131] The PDSCH is a physical layer UL channel for UL data transmission. The PDSCH carries DL data (e.g., DL-SCH transport blocks) and undergoes modulation such as Quadrature Phase Shift Keying (QPSK), 16-Quadrature Amplitude Modulation (QAM), 64QAM, 256QAM, etc. Codewords are generated by encoding the transport block (TB). The PDSCH may carry up to two codewords. Scrambling and modulation mapping for each codeword may be performed, and the modulation symbols generated from each codeword may be mapped to one or more layers. Each layer is mapped to radio resources together with the DMRS and generated as an OFDM symbol signal. Then, the OFDM symbol signal is transmitted through the corresponding antenna port.

[0132] Figure 9 Examples of PDSCH TDRA caused by the PDCCH and examples of PUSCH TDRA caused by the PDCCH are shown.

[0133] The DCI carried by PDCCH for scheduling PDSCH or PUSCH includes a TDRA field. The TDRA field provides the value m of the row index m + 1 for the allocation table of PDSCH or PUSCH. The predefined default PDSCH time-domain allocation is applied as the allocation table of PDSCH, or the PDSCH TDRA table configured by the BS through the RRC signal pdsch-TimeDomainAllocationList is applied as the allocation table of PDSCH. The predefined default PUSCH time-domain allocation is applied as the allocation table of PUSCH, or the PUSCH TDRA table configured by the BS through the RRC signal pusch-TimeDomainAllocationList is applied as the allocation table of PUSCH. The PDSCH TDRA table to be applied and / or the PUSCH TDRA table to be applied can be determined according to fixed / predefined rules (e.g., refer to 3GPP TS 38.214).

[0134] In the PDSCH time-domain resource allocation, each index row defines the DL assignment and the PDSCH time slot offset K0, the start and length indicator SLIV (or the start position of the PDSCH in the direct time slot (e.g., the start symbol index S) and the allocation length (e.g., the number of symbols L)), and the PDSCH mapping type. In the PUSCH time-domain resource allocation, each index row defines the UL grant and the PUSCH time slot offset K2, the start position of the PUSCH in the time slot (e.g., the start symbol index S) and the allocation length (e.g., the number of symbols L), and the PUSCH mapping type. K0 of the PDSCH and K2 of the PUSCH indicate the difference between the time slot with the PDCCH and the time slot with the PDSCH or PUSCH corresponding to the PDCCH. SLIV represents the combined indicator of the start symbol S relative to the start of the time slot with the PDSCH or PUSCH and the number of consecutive symbols L counted from symbol S. There are two PDSCH / PUSCH mapping types: one is mapping type A and the other is mapping type B. In the case of PDSCH / PUSCH mapping type A, the DMRS is mapped to the PDSCH / PUSCH resource relative to the start of the time slot. Depending on other DMRS parameters, one or two symbols of the PDSCH / PUSCH resource can be used as DMRS symbols. For example, in the case of PDSCH / PUSCH mapping type A, according to the RRC signaling, the DMRS is located in the third symbol (symbol #2) or the fourth symbol (symbol #3) in the time slot. In the case of PDSCH / PUSCH mapping type B, the DMRS is mapped relative to the first OFDM symbol of the PDSCH / PUSCH resource. Depending on other DMRS parameters, one or two symbols starting from the first symbol of the PDSCH / PUSCH resource can be used as DMRS symbols. For example, in the case of PDSCH / PUSCH mapping type B, the DMRS is located at the first symbol allocated for the PDSCH / PUSCH. In the present disclosure, the PDSCH / PUSCH mapping type can be referred to as the mapping type or the DMRS mapping type. For example, in this specification, the PUSCH mapping type A can be referred to as mapping type A or DMRS mapping type A, and the PUSCH mapping type B can be referred to as mapping type B or DMRS mapping type B.

[0135] The scheduling DCI includes the FDRA field that provides the assignment information about the RBs for the PDSCH or PUSCH. For example, the FDRA field provides the information about the cell for the PDSCH or PUSCH transmission to the UE, the information about the BWP for the PDSCH or PUSCH transmission, and / or the information about the RBs for the PDSCH or PUSCH transmission.

[0136] As a time-frequency resource set that a UE can monitor for PDCCH, a CORESET can be defined and / or configured. One or more CORESETS can be configured for the UE. 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 can be provided to the UE via higher layer (e.g., RRC) signaling. The UE can monitor a set of PDCCH candidates in the configured CORESET according to the corresponding search space set. In the present disclosure, monitoring means decoding (blind decoding) 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 for the PDSCH that schedules the SIB1. The PBCH can indicate the absence of an associated SIB1. In this case, the UE can be provided not only with the frequency range in which the UE is allowed to assume the absence of an SSB associated with the SSB1, but also with another frequency range in which the UE is allowed to discover an SSB associated with the SIB1. As the CORESET for scheduling at least the SIB1, CORESET #0 can be configured via the MIB or dedicated RRC signaling.

[0137] The set of PDCCH candidates 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 a CORESET configuration.

[0138] The UE monitors the set of PDCCH candidates in one or more CORESETS on the active DL BWP of each enabled serving cell configured for PDCCH monitoring according to the corresponding search space set, where monitoring means receiving each PDCCH candidate and decoding it according to the monitored DCI format.

[0139] The following table shows the PDCCH search space.

[0140] [Table 4]

[0141]

[0142] The SS set can be configured via system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. S (e.g., 10) SS sets or fewer can be configured in each DL BWP of the serving cell. For example, the following parameters / information can be provided for each SS set. Each SS set can be associated with a CORESET, and each CORESET configuration can be associated with one or more SS sets.

[0143] - searchSpaceId: Indicates the ID of the SS set.

[0144] - controlResourceSetId: Indicates the CORESET associated with the SS set.

[0145] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring periodicity (in terms of slots) and the PDCCH monitoring offset (in terms of slots).

[0146] - monitoringSymbolsWithinSlot: Indicates the first OFDMA symbol for PDCCH monitoring in the slot configured for PDCCH monitoring. The first OFDMA symbol is indicated by a bitmap, and each bit corresponds to a respective OFDMA symbol in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDMA symbol corresponding to a bit with a value of 1 corresponds to the first symbol in the CORESET in the slot.

[0147] - nrofCandidates: Indicates the number of PDCCH candidates for each AL (where AL = {1, 2, 4, 8, 16}) (e.g., one of 0, 1, 2, 3, 4, 5, 6, and 8).

[0148] - searchSpaceType: Indicates whether the SS type is CSS or USS.

[0149] - DCI format: Indicates the DCI format of the PDCCH candidate.

[0150] The UE can monitor PDCCH candidates in one or more SS sets in a slot according to the configuration of the CORESET / SS set. The timing (e.g., time / frequency resources) for monitoring PDCCH candidates is defined as the PDCCH (monitoring) occasion. One or more PDCCH (monitoring) occasions can be configured within a slot.

[0151] Figure 10 Shows the multiplexing pattern of the SSB and the CORESET. Specifically, Figure 10 (a) of shows the SSB and CORESET multiplexing pattern 1, Figure 10 (b) of shows the SSB and CORESET multiplexing pattern 2, Figure 10 (c) of shows the SSB and CORESET multiplexing pattern 3. The SSB and CORESET multiplexing pattern can be predefined based on the frequency range (FR) to which the corresponding cell belongs or the SCS of the SSB or PDCCH.

[0152] As Figure 10As shown, SSB and CORESET can be multiplexed in the time domain, in both the time and frequency domains, or in the frequency domain. As Figure 10 shown, SSB and CORESET can be multiplexed in the time domain, in both the time and frequency domains, or in the frequency domain.

[0153] The set of PDCCH candidates 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 a CORESET configuration.

[0154] The set of PDCCH candidates can be monitored in one or more CORESETs on the active DL BWP of each enabled serving cell configured for PDCCH monitoring. Here, monitoring means receiving each PDCCH candidate and performing decoding according to the monitored DCI format.

[0155] Figure 11 Discontinuous reception (DRX) operation is shown. Specifically, Figure 11 the DRX cycle of a UE in the RRC_CONNECTED state is shown.

[0156] The UE can perform DRX operation while executing the processing and / or method according to the implementation of the present disclosure. The DRX configuration / operation is defined in the NR specification (e.g., Rel-17). DRX for reducing unnecessary power consumption of the UE has the following characteristics. In DRX, the structure of a UE in the RRC_IDLE state (hereinafter referred to as I-DRX) and the structure of a UE in the RRC_CONNECTED state (hereinafter referred to as C-DRX) are defined separately. The two DRX structures are designed such that the period during which the UE expects to receive DL signals (e.g., the active time period or the on-duration period) appears periodically, thereby reducing the unnecessary power consumption of the UE in other periods. In particular, in the case of C-DRX, the start position of the on-duration period is defined periodically according to the NR Rel-16 specification. In this case, the size of the configured period (i.e., the DRX cycle) can be determined / configured by higher layer signaling such as RRC signaling provided by the BS to the UE.

[0157] Refer to Figure 11, the DRX cycle includes an on-duration and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the on-duration. The on-duration is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on-duration. When the UE successfully detects a PDCCH during PDCCH monitoring, the UE starts an inactivity timer and remains awake. Conversely, when the UE fails to detect any PDCCH during PDCCH monitoring, the UE transitions to a sleep state after the on-duration. Thus, when DRX is configured, the UE can perform PDCCH monitoring / reception discontinuously in the time domain in a process and / or method according to an implementation of the present disclosure. For example, when DRX is configured, the PDCCH reception occasion (e.g., a time slot with a PDCCH search space) can be configured discontinuously according to the DRX configuration in the present disclosure. Conversely, when DRX is not configured, the UE can perform PDCCH monitoring / reception continuously in the time domain. For example, when DRX is not configured, the PDCCH reception occasion (e.g., a time slot with a PDCCH search space) can be configured continuously in the present disclosure. Regardless of whether DRX is configured, PDCCH monitoring can be restricted during a time period configured as a measurement gap. DRX configuration information is received via higher layer (e.g., RRC) signaling, and DRX on / off is controlled via a DRX command from the MAC layer. Once DRX is configured, the UE can perform PDCCH monitoring discontinuously, as Figure 8 shown.

[0158] The following table describes the DRX operation of the UE. Referring to the following table, DRX configuration information is received via higher layer signaling (e.g., RRC signaling), and DRX on / off is controlled via a DRX command from the MAC layer. Once DRX is configured, the UE can perform PDCCH monitoring discontinuously, as Figure 11 shown.

[0159] [Table 5]

[0160]

[0161] MAC-CellGroupConfig includes the 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 information when defining DRX.

[0162] - The value of drx-OnDurationTimer: Configures the duration at the start of the DRX cycle.

[0163] - Value of drx-SlotOffset: Configures the delay before starting drx-onDurationTimer.

[0164] - Value of drx-InactivityTimer: The duration after a PDCCH occasion indicating a new UL or DL transmission to the MAC entity.

[0165] - Value of drxRetransmissionTimerDL (for each DL HARQ process except broadcast handling): Configures the maximum duration until a DL retransmission is received.

[0166] - Value of drxRetransmissionTimerUL (for each UL HARQ process): Configures the maximum duration until a grant for a UL retransmission is received.

[0167] - Value of drx-HARQ-RTT-TimerDL (for each DL HARQ process except broadcast handling): Configures the maximum duration from receiving an initial DL transmission to receiving a DL assignment for a HARQ retransmission.

[0168] - Value of drx-HARQ-RTT-TimerUL (for each UL HARQ process): Configures the maximum duration from receiving a grant for an initial UL transmission to receiving a grant for a UL retransmission.

[0169] - drx-LongCycleStartOffset: Configures the long DRX cycle and drx-StartOffset, which define the subframes at which the long and short DRX cycles start.

[0170] - drx-ShortCycle (optional): Configures the short DRX cycle.

[0171] - drx-ShortCycleTimer (optional): Configures the duration for which the UE should follow the short DRX cycle. For example, the value of a multiple of the short DRX cycle can be configured via drx-CycleTimer. For example, the value of n can correspond to n * drx-ShortCycle.

[0172] If the DRX group is within the active time, the UE may perform PDCCH monitoring on the serving cells within the DRX group. In this case, the DRX group refers to a set of serving cells configured by RRC and having the same DRX active time. When DRX is configured, the active time of the serving 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 time when drx-RetransmissionTimerDL or drx-RetransmissionTimerUL is running on any serving cell in the DRX group; or the ra-ContentionResoultionTimer or msgB-RsponseWindow is running; or the time when no new transmission PDCCH indicating the C-RNTI of the MAC entity destined for the UE is received after successfully receiving a random access response for a random access preamble not selected by the MAC entity among the contention-based random access preambles.

[0173] Figure 12 Illustrates the cases of configuring long DRX cycles and short DRX cycles. Specifically, Figure 12 Illustrates the case where the drx-ShortCycleTimer is set to 2.

[0174] The BS may configure a long DRX cycle and an additional short DRX cycle shorter than the long DRX cycle. If no short DRX cycle is configured, the UE may follow the long DRX cycle. When a 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 no short DRX cycle were configured. If there is data activity during the on-duration of the long DRX cycle, for example, while the drx-onDurationTimer is running, the UE switches to the short DRX cycle and follows the short DRX cycle for a specific period (e.g., while the drx-ShortCycleTimer is running). Referring to Figure 12 , if there is no data activity during the time 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 the short DRX cycle, each having the duration of the drx-ShortCycleTimer, to the long DRX cycle.

[0175] Figure 13 Illustrates the SIB1 transmission in a 3GPP-based system. In Figure 13 In, PSIB1 Indicates the transmission periodicity or transmission repetition periodicity of SIB1. Additionally, SIB1 PDSCH refers to the PDSCH carrying SIB1, and SIB1 PDCCH refers to the PDCCH carrying the DCI format for scheduling the SIB1 PDSCH.

[0176] According to the current 5G specification, in Figure 13 , as part of the minimum system information required for cell access, SIB1 is sent on the DL-SCH with a periodicity of 160 ms or a variable transmission repetition periodicity within 160 ms. The default transmission repetition periodicity of SIB1 is 20 ms, but the actual transmission repetition periodicity depends on the network implementation. For the SSB and CORESET multiplexing pattern 1, the transmission repetition period of SIB1 is 20 ms. For the SSB and CORESET multiplexing patterns 2 / 3, the transmission repetition period of SIB1 is the same as the SSB period.

[0177] The PDCCH monitoring occasion for the UE to attempt to decode the SIB1 PDCCH can be determined based on the information in the MIB (e.g., pdcch-ConfigSIB1). For example, during cell search, if the UE determines based on the MIB that there is a Type0-PDCCH CSS set, the UE can determine the number of consecutive RBs and the number of consecutive symbols of the CORESET of the Type0-PDCCH CSS set from controlResourceSetZero in pdcch-ConfigSIB1. The UE can also determine the PDCCH monitoring occasion 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 can be provided by searchSpaceZero, SFN C ; the first time slot, time slot n0, including the Type-0 monitoring occasion in the frame corresponding to SFN C ; and the parameter value combination required to determine the index of the first symbol of the corresponding CORESET in time slot n0.

[0178] The UE can monitor the Type0-PDCCH CSS set in the PDCCH monitoring occasion to detect the SIB1 PDCCH. The UE can determine the frequency resource allocation and time resource allocation of the SIB1 PDSCH from the DCI carried by the SIB1 PDCCH. The UE can receive / decode SIB1 based on the frequency resource allocation and time resource allocation.

[0179] 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 procedure and the RRC connection resume procedure. A PO refers to a set of PDCCH monitoring occasions and can be composed of multiple time slots (e.g., subframes or OFDM symbols). A DCI with a CRC scrambled by P-RNTI can be sent on the PO. The following information can be sent through a DCI format (e.g., DCI format 1_0) with a CRC scrambled by P-RNTI.

[0180] - Short message indicator according to Table 6

[0181] - Short message according to Table 7. In Table 7, bit 1 is the most significant bit (MSB).

[0182] - Frequency domain resource allocation

[0183] - Time domain resource allocation

[0184] - VRB to PRB mapping according to Table 8

[0185] - Modulation and coding scheme

[0186] - Transport block (TB) scaling

[0187] - Tracking reference signal (TRS) availability indication

[0188] - Reserved bits

[0189] [Table 6]

[0190]

[0191] [Table 7]

[0192]

[0193] [Table 8]

[0194] Bit field mapped to index VRB to PRB mapping 0 Non-interleaved 1 Interleaved

[0195] In this disclosure, a PDCCH carrying a DCI format with a CRC scrambled by P-RNTI is referred to as a paging PDCCH. A PDSCH scheduled by the paging PDCCH is referred to as a paging PDSCH. The UE can decode the paging PDSCH based on the scheduling information (e.g., frequency domain resource allocation, modulation and coding scheme, etc.) in the paging PDCCH. The paging PDSCH carries a paging message. The paging message is used to notify one or more UEs and can include one or more UE identifiers (IDs).

[0196] 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 procedure and the RRC connection resume procedure. A PO refers to a set of PDCCH monitoring occasions and can be composed of multiple time slots (e.g., subframes or OFDM symbols). A DCI with a CRC scrambled by P-RNTI can 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 radio access network (RAN)-initiated paging and core network (CN)-initiated paging. A paging frame (PF) is a radio frame and can contain one or more POs or the starting points of POs. The UE monitors one paging occasion (PO) per DRX cycle. The PF and PO for paging can be determined by a predefined equation. For example, in some implementations, the system frame number (SFN) of the PF can be determined by (SFN + PF_offset) mod T = (T div N) * (UE_ID mod N), and the index i_s indicating the index of the PO can be determined by i_s = floor(UE_ID) mod Ns, where T is the UE's DRX cycle and is determined by the shortest value among 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 for the PF, PF_offset is the offset for PF determination, and UE_ID is a value determined based on 5G-S-TMSI. The following parameters can be signaled in SIB1: the parameter related to the number of POs per paging frame, Ns; the parameter for deriving the total number of paging frames in T, nAndPagingFrameOffset; the parameter related to the number of PDCCH monitoring occasions corresponding to the SSB 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: the parameter indicating the first PDCCH monitoring occasion for paging of each PO for the PF, firstPDCCH-MonitoringOccasionOfPO; and the parameter nrofPDCCH-MonitoringOccasionsPerSSB-InPO. For paging in the initial DL BWP, the parameter firstPDCCH-MonitoringOccasionOfPO can be signaled in SIB1.For paging in a DL BWP other than the initial DL BWP, the parameter firstPDCCH-MonitoringOccasionOfPO can be signaled in the corresponding BWP configuration.

[0197] The UE can use paging early indication (PEI) in the RRC_IDLE and RRC_INACTIVE states to reduce power consumption. If the PEI configuration is provided in the system information, a UE in the RRC_IDLE or RRC_INACTIVE state that supports PEI can use the PEI parameters in the system information to monitor the PEI. The UE monitors one PEI occasion per DRX cycle. A PEI occasion (PEI-O) is a set of PDCCH monitoring occasions and can consist of multiple time slots (e.g., subframes or OFDM symbols) on which the PEI can be sent. In multi-beam operation, the UE assumes that the same PEI is repeated across all transmitted beams. The time position of the PEI-O for the PO of the UE is determined by a reference point and an offset. The reference point is the start of the reference frame determined by a frame-level offset (provided by pei-FrameOffset in SIB1) from the start of the first PF in the PF associated with the PEI-O, and the offset is a symbol-level offset from the reference point to the start of the first PDCCH MO of that PEI-O (provided by firstPDCCH-MonitoringOccasionOfPEI-O in SIB1). If a PEI-O is associated with the POs of two PFs, the two PFs are consecutive PFs calculated by the parameters PF_offset, T, Ns, and N. Details of the PEI can be found in 3GPP TS 38.304 and 3GPP TS 38.213.

[0198] Paging DRX is defined, which requires a UE in the RRC_IDLE or RRC_INACTIVE state to monitor the paging channel during one PO per DRX cycle. The network can configure the following paging DRX cycles: i) for CN-initiated paging, broadcast the default cycle in the system information, ii) for CN-initiated paging, configure a UE-specific cycle via non-access stratum (NAS) signaling, and iii) for RAN-initiated paging, configure a UE-specific cycle via RRC signaling. The UE uses the shortest cycle among the applicable DRX cycles. For example, a UE in the RRC_IDLE state can use the shortest cycle among the first two cycles above, and a UE in the RRC_INACTIVE state can use the shortest cycle among the three cycles.

[0199] Due to its potential contribution to building an environment-friendly network by reducing carbon emissions and cutting down the operating expenditure (OPEX) of communication operators, energy saving of BSs is significantly considered in wireless communication systems including 3GPP. In particular, with the escalating demand for high transmission rates with the advent of 5G communication, BSs need to be equipped with a larger number of antennas and provide services within a wider bandwidth and frequency band. According to recent research, the energy cost of BSs has reached as high as 20% of the total OPEX. Due to the increasing attention to BS energy saving, 3GPP NR Release 18 approved a new research project called "Network Energy Saving Research". For example, to enhance the energy saving capabilities in the transmission and reception of BSs, this research investigated how to use potential support / feedback from UEs and potential UE support information to dynamically and / or semi-statically achieve more efficient transmission and / or reception operations in the time, frequency, space, and power domains with finer adaptive granularity based on one or more network energy saving technologies.

[0200] In the following, methods and procedures for BS energy saving will be described by allocating the transmission / reception of common signals / channels such as SSB, SIB1, other SI, and / or paging, rather than performing transmission / reception only on serving cells.

[0201] According to some implementations of the present disclosure, in a light load situation where the BS has little data to transmit, the BS can save energy by shutting down the transmission / reception of specific DL / UL signals and channels within a specific time period or by reducing the amount of frequency resources such as operating BWPs. For example, the BS can control the transmission / reception on a carrier / cell based on scheduling on the carrier / cell. However, considering that the transmission of common signals / channels such as SSB / SIB1 / other SI / paging is crucial for cell selection (reselection), initial access, radio resource management (RRM) measurement, etc., the common signals / channels are regarded as always-on signals / channels that need to be transmitted periodically. If the BS does not transmit signals at all or transmits signals with an overly long period, problems may occur in cell detection, time and frequency synchronization, paging, radio link management (RLM), and / or RRM measurement of the UE. As a result, the performance of UEs accessing the corresponding cell may deteriorate. Therefore, when the BS intends to discard or reduce the transmission of cell common signals / channels related to cell detection, time and frequency synchronization, paging, RLM, and / or RRM measurement of the UE in addition to the signals / channels that the BS can schedule or configure according to the load condition of the BS (e.g., PDCCH / PUSCH / PDSCH / CSI-RS / SRS, etc.) in order to operate in a network energy saving (NES) mode on the cell, a method for minimizing the impact on the UE is required.

[0202] In view of the above, in some implementations of the present disclosure, the following scenarios may be considered. The SSB and / or SIB (hereinafter, SSB / SIB) are not transmitted in the serving cell. Instead, broadcast common signals and channels such as SSB / SIB are transmitted in another cell, carrier, and / or frequency (hereinafter, cell / carrier / frequency). In this case, the serving cell is mainly responsible for transmitting / receiving all or part of the random access and paging, thereby achieving network energy saving benefits. For example, some implementations of the present disclosure are described, in which the serving cell indicates the cell / carrier / frequency for performing initial access or the cell / carrier / frequency for performing on-demand system information (SI) and SI updates via SI or paging. According to some implementations of the present disclosure, the serving cell does not need to transmit signals such as SSB / SIB1 that need to be transmitted periodically, thereby ensuring a relatively long sleep mode (i.e., power saving mode) operation time and achieving power consumption reduction and interference mitigation effects. Therefore, the effect of reducing the power consumption in the BS / network while minimizing the degradation of the UE's performance can be achieved.

[0203] Hereinafter, the operation of the BS in the NES mode for energy saving (ES) may mean that the BS pre-configures multiple off-periods (i.e., discontinuous transmission (DTX)) for turning off the transmission of specific DL / UL signals during a specific time period, and then dynamically indicates one of the off-periods to notify that the corresponding DL signal will not be transmitted during a predefined time period, so as to achieve power consumption reduction for both the BS and the UE. The NES mode can be applied not only to the time domain but also to the following operations in the frequency domain: BWP switching, dynamic RB adaptation, etc. For the spatial domain, the NES mode may refer to an operation mode in which when the BS semi-statically or dynamically disables a specific receiving antenna port, the BS avoids performing transmission and / or reception on the corresponding antenna port to achieve power consumption reduction for both the BS and the UE.

[0204] <Method #1> For the purpose of NES, the BS / UE performs the transmission / reception of common signals / channels such as SSB / SIB1 / other SI / paging and / or the random access process only on a specific cell / carrier / physical cell identifier (PCID) / frequency, and does not perform (such as the entire or partial transmission / reception of common signals / channels such as SSB / SIB1 / other SI / paging and / or the random access process) on another cell / carrier / PCID / frequency.

[0205] <Method #1-1> An additional CORESET / search space (SS) set is configured for receiving system information (such as SIB1) on another cell / carrier / PCID / frequency (such as a non-anchor carrier) on a specific carrier (such as an anchor carrier).

[0206] In the present disclosure, the anchor carrier may be the carrier of the PCell, and the non-anchor carrier may be the carrier of the SCell, but the anchor carrier is not necessarily limited to the PCell.

[0207] Figure 14 A process of transmitting or receiving a common signal / channel according to some implementations of the present disclosure is shown.

[0208] For energy saving purposes on a specific carrier (e.g., the anchor carrier), the BS may turn off the transmission of system information (e.g., SIB1) or change the transmission periodically to be significantly longer. The BS may configure another cell / carrier / PCID / frequency or multiple (candidate) cells / carriers / PCID / frequencies for the UE to receive system information on the specific carrier (e.g., the anchor carrier). In some implementations, the BS may configure different CORESET / SS sets for each cell / carrier / PCID / frequency. In this case, the SIB1 (or MIB or other SI) of the specific carrier may directly include the CORESET / SS set information of another non-anchor carrier. Alternatively, the SIB1 of the specific carrier may include the scheduling information of other SIs containing the corresponding information, and the UE may be allowed to obtain the CORESET / SS set information of another cell / carrier / PCID / frequency through other SIs to receive the SI. The UE receiving the common signal / channel on the specific carrier (e.g., the anchor carrier) may receive the system information (e.g., SIB1) of the specific carrier (e.g., the anchor carrier) from other cells / carriers / PCID / frequencies (e.g., non-anchor carriers) based on the information about other cells / carriers / PCID / frequencies and the CORESET / SS set included in the SIB1 of the specific carrier or other SIs scheduled by the SIB1. In other words, the BS may inform the UE through the SIB1 or other SIs of the specific carrier of another cell / carrier / PCID / frequency and the CORESET / SS set that will carry the SIB1 and other SIs originally carried by the specific carrier. Referring to Figure 14 , for example, the BS may transmit the common signal / channel of the first cell on the first cell, and the UE may monitor the common signal / channel of the first cell on the first cell (S1401). The BS may provide, through the SI of the first cell, the information about other cells / carriers / PCID / frequencies where the SI of the first cell (e.g., SIB1 or other SIs scheduled by the SIB1) will be transmitted and the information about the CORESET / SS set (S1403). Based on the information about other cells / carriers / PCID / frequencies and the information about the CORESET / SS set, the BS / UE may transmit / receive the SIB1 PDCCH on another cell / carrier / PCID / frequency (e.g., the second cell) based on the CORESET and the SS set (S1405). The SIB1 PDSCH scheduled by the SIB1 PDCCH may be transmitted / received on the second cell.

[0209] In some implementations, the cell / carrier / PCID / frequency for receiving SI of a specific carrier may be not one but multiple. Since each CORESET / SS set can be configured, the cell / carrier / PCID / frequency list and index may be included in SIB1 or other SI (OSI) scheduled by SIB1. The index of the specific cell / carrier / PCID / frequency for the UE to receive SIB1 may be directly indicated, or according to a prior agreement / configuration, the UE may always receive SIB1 from the cell / carrier / PCID / frequency with the lowest / highest index. For example, the UE may be configured to receive SIB1 on the serving cell with the lowest or highest index among the serving cells configured for the UE. Alternatively, the index of the specific cell / carrier / PCID / frequency for the UE to receive SIB1 may be selected by applying weights to the cell / carrier / PCID / frequency list and / or the UEID.

[0210] On the other hand, to allow the UE to receive system information of other cells / carriers / PCID / frequencies (e.g., non-anchor carriers) on a specific carrier (e.g., the anchor carrier), the BS may configure the CORESET / SS set separately for the other cells / carriers / PCID / frequencies within the specific carrier (e.g., the anchor carrier). The CORESET / SS set configuration information of the other cells / carriers / PCID / frequencies may be sent through the MIB / SIB1 of the specific carrier (e.g., the anchor carrier) or the OSI scheduled by SIB1. In this case, to obtain the necessary information, the UE may need to receive the OSI including SIB1 of other non-anchor carriers through the configured CORESET / SS set. As a result, the non-anchor carriers can offload the signals / channels that need to be periodically transmitted from the anchor carrier, thereby achieving relatively more energy saving.

[0211] <Method #1-2> When sending paging DCI on a specific carrier (e.g., the anchor carrier), indicate through the paging DCI or the paging PDSCH for which cell / carrier / PCID / frequency the paging message is sent or whether there is an SI update.

[0212] In LTE, SI update information is included in the paging PDSCH message. Therefore, when the UE receives a paging PDCCH on a PO, the UE needs to decode the PDSCH to check for SI update information and then receive SIB1. In NR, for SI updates, two types of SI update information can be indicated by a short message field masked with a P-RNTI in the PDCCH, without the need to decode the PDSCH. One bit can indicate the existence of a general SI update and instruct the UE to receive SI update information in the next modification period. Another bit can indicate modification information such as an earthquake and tsunami warning system (ETWS) or a commercial mobile alert system (CMAS) that should not wait until the next update period, thus allowing immediate execution of SI updates without waiting for the modification period. However, in both cases, the short message does not specify which SIB the UE should receive. Therefore, the UE needs to receive SIB1 to check which SIB to update and then check the OSI scheduling information to update the OSI. When paging DCI is sent on a specific carrier (e.g., an anchor carrier), it is necessary to inform the UE for which cell / carrier / PCID / frequency the paging message is sent or whether there is an SI update. In some implementations of the present disclosure, the transmission status of the paging message or the existence of an SI update can be notified by a specific field (e.g., by reusing an existing field or using reserved bits) or a combination of specific fields in the paging DCI sent on a specific carrier (e.g., an anchor carrier). The UE can receive the PDSCH scheduled by the corresponding DCI to check for which cell / carrier / PCID / frequency the paging message is or whether an SI update needs to be performed. Alternatively, if there is not enough space in the paging PDCCH or paging PDSCH to provide information about the cell / carrier / PCID / frequency carrying the paging message or updating the SI. The paging PDCCH or paging DCI can indicate the index of the cell / carrier / PCID / frequency for which the UE should receive SIB1. Which cell / carrier / PCID / frequency the paging message is sent or whether there is an SI update can be notified directly in SIB1 or through the OSI scheduled by SIB1. Additionally, which cell / carrier / PCID / frequency the paging message is sent or whether there is an SI update can be notified directly through SIB1 or through the OSI scheduled by SIB1.

[0213] <Method #1-3> For (existing) on-demand SI, the wake-up signal (WUS) resources (e.g., RACH opportunity / preamble configuration for sending RACH to a specific cell / carrier / PCID / frequency) are adjusted according to which cell / carrier / PCID / frequency the SI request is for.

[0214] For energy saving purposes, the BS may not transmit SSB / SIB1 / OSI on a specific carrier (e.g., the anchor carrier), or may transmit SSB / SIB1 / OSI only with a significantly long period. However, if the UE requests SI transmission using a pre-configured specific UL WUS (e.g., RACH), the BS may operate SI on demand to transmit the corresponding SSB / SIB1 / OSI. If the UE receives SSB / SIB1 on another cell / carrier / PCID / frequency, different WUS resources may be configured according to which cell / carrier / PCID / frequency among the multiple cells / carriers / PCID / frequencies configured for the UE makes the SI request. Therefore, the BS may configure UL BWP and / or RACH configuration (e.g., RACH occasion and / or RACH preamble index) for each cell / carrier / PCID / frequency index through SIB1 transmitted on a specific carrier (e.g., the anchor carrier). According to which cell / carrier / PCID / frequency makes the SI request, the UE may perform the SI request by transmitting RACH at the RACH occasion (RO) and / or in the preamble in the RACH configuration configured for the corresponding cell / carrier / PCID / frequency index.

[0215] <Method #1-4> indicates on which cell / carrier / PCID / frequency to perform initial access through paging. Alternatively, it indicates the RO / preamble resources corresponding to the corresponding cell / carrier / PCID / frequency through paging.

[0216] According to the current standard, the paging PDCCH and paging PDSCH do not include information related to RACH selection. The paging PDCCH includes the scheduling information of the paging PDSCH, and the paging PDSCH includes information about the (multiple) UE IDs. Therefore, if the UE ID of the UE is included in the received paging PDSCH, similar to the initial access procedure, the UE may use the RO / preamble corresponding to the best beam among the received SSBs to transmit RACH based on the RACH / RO configuration configured in the initial UL BWP through SIB1.

[0217] To allow the UE to perform initial access on a cell / carrier / PCID / frequency other than a specific carrier (e.g., the anchor carrier), the BS needs to directly indicate via paging on which cell / carrier / PCID / frequency to perform initial access or indicate the RO / preamble resources corresponding to the cell / carrier / PCID / frequency. This can be notified via a specific field in the paging DCI (e.g., by reusing an existing field or using reserved bits), a combination of specific fields, or the paging PDSCH. If there is not enough space in the paging PDCCH or paging PDSCH to directly indicate information about the cell / carrier / PCID / frequency or RO / preamble resources for the UE to perform initial access, the index of the cell / carrier / PCID / frequency on which the UE performs initial access can be directly indicated via SIB1 or indicated via an OSI scheduled by SIB1, or the RO / preamble resources corresponding to the cell / carrier / PCID / frequency can be indicated.

[0218] According to Method #1-4, different from the prior art where paging can be transmitted on any one of multiple cells / carriers / PCID / frequencies, paging can be performed on a specific cell / carrier / PCID / frequency. Therefore, according to Method #1-4, the BS energy for operating other cells / carriers / PCID / frequencies can be saved, and the UE can save energy by only monitoring the specific cell / carrier / PCID / frequency for paging. According to Method #1-4, different from the prior art where initial access is performed on the cell where the paging message is sent, the BS can specify the cell / carrier / PCID / frequency on which the UE performs initial access via the paging PDCCH or paging PDSCH. Therefore, the number of cells / carriers / PCID / frequencies for random access can be appropriately adjusted according to the channel state or the number of UEs attempting to access.

[0219] <Method #1-5> Indicate in Msg4 (Msg2 or MsgB) the cell / carrier / PCID / frequency for DL / UL signal and channel transmission / reception after random access is completed.

[0220] When the UE performs a random access procedure on a specific carrier (e.g., an anchor carrier), the BS may indicate to the UE different cells / carriers / PCIDs / frequencies for sending / receiving specific DL / UL signals after the random access is completed. In other words, during the random access procedure via a specific carrier, the BS may indicate to the UE different cells / carriers / PCIDs / frequencies for communication after the random access is completed. In this case, in addition to common signals and channels such as SSB / SIB1 / OSI / paging, the UL / DL signals and channels that the UE can send / receive via the indicated cells / carriers / PCIDs / frequencies may include all UL / DL signals and channels, such as periodic or semi-persistent PUCCH / (configured grant) PUSCH / SRS / PDSCH that are pre-configured and periodically retransmitted. Alternatively, the UL / DL signals and channels may include other UL / DL signals and channels except for the common signals and channels (e.g., SSB / SIB1 / OSI / paging) sent / received on a specific carrier (e.g., an anchor carrier). The BS may indicate to the UE the cells / carriers / PCIDs / frequencies for sending / receiving DL / UL signals and channels via Msg4 (in the case of 2-step RACH, Msg2 or MsgB) during the random access procedure. In this case, the UE may pre-receive a list and index of cells / carriers / PCIDs / frequencies capable of sending / receiving DL / UL signals and channels via SIB1. Based on this configuration, the BS may directly indicate a specific cell / carrier / PCID / frequency to the UE via Msg4 (Msg2 or MsgB). In Method #1-5, Msg4 or Msg2 may refer to the DCI scheduling the relevant PDSCH, or Msg4 or Msg2 may refer to the PDSCH containing Msg4 or Msg2 (Msg2 may be a RAR). Additionally, in Method #1-5, MsgB may refer to the DCI scheduling the relevant PDSCH, or MsgB may refer to the PDSCH containing MsgB (or the MAC control element (CE) carried on the PDSCH).

[0221] The above Method #1-1 to Method #1-5 can be applied individually or in combination.

[0222] According to any of the above Method #1-1 to Method #1-5, the BS can save relatively more energy (over a longer period) by offloading the common signals / channels of some cells operated by the BS to other cells. From the UE's perspective, the UE can save relatively more energy (over a longer period) by performing the reception / transmission of the common signals / channels of some of its serving cells on other serving cells.

[0223] Figure 15 Shows the process of DL / UL signal reception / transmission of a UE according to some implementations of the present disclosure.

[0224] The UE may perform operations in association with DL / UL signal reception / transmission according to some implementations 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 that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The processing apparatus for the 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 that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program including instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer program or computer program product may include instructions that are recorded on at least one computer-readable (non-transitory) storage medium and that, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure.

[0225] The method performed by the UE or the operations of the UE, the processing apparatus, the computer-readable (non-transitory) storage medium, and / or the computer program product may include: performing PDCCH monitoring on a first cell based on a P-RNTI (S1501); detecting a DCI format having a CRC scrambled by the P-RNTI on the first cell (S1503); obtaining information about a second cell based on the DCI format; and transmitting a RACH on the second cell at a RACH occasion (S1505).

[0226] In some implementations, the information about the second cell may be included in the DCI format.

[0227] In some implementations, the method or operation may include decoding a PDSCH carrying a paging message including the ID of the UE based on the DCI format.

[0228] In some implementations, the paging message may include information about the second cell and information about the RACH occasion.

[0229] In some implementations, the DCI format may include information about a third cell for receiving SIB1. The method or operation may include receiving SIB1 on the third cell. In some implementations, obtaining information about the second cell based on the DCI format may include obtaining information about the second cell based on SIB1.

[0230] In some implementations, the information about the second cell may be included in SIB1.

[0231] In some implementations, information about the second cell is included in the OSI scheduled by SIB1.

[0232] Figure 16 Shows the process of DL / UL signal transmission / reception of the BS according to some implementations of the present disclosure.

[0233] The BS may perform operations associated with DL / UL signal transmission / reception according to some implementations 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 that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The processing device for the 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 that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program including instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer program or computer program product may include instructions that are recorded on at least one computer-readable (non-transitory) storage medium and that, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure.

[0234] The method performed by the BS or the operations of the BS, processing device, computer-readable (non-transitory) storage medium, and / or computer program product may include: transmitting a PDCCH of DCI format carrying a CRC scrambled by P-RNTI on a first cell (S1601); and receiving a RACH from the UE in a RACH occasion on a second cell based on the DCI format (S1603).

[0235] In some implementations, information about the second cell may be included in the DCI format.

[0236] In some implementations, the method or operation may include transmitting a PDSCH carrying a paging message including an identifier of the UE based on the DCI format.

[0237] In some implementations, the paging message may include information about the second cell and information about the RACH occasion.

[0238] In some implementations, the DCI format may include information about a third cell for receiving SIB1. The method and operation may include transmitting SIB1 on the third cell.

[0239] In some implementations, information about the second cell may be included in SIB1.

[0240] In some implementations, information about the second cell may be included in the OSI scheduled by SIB1.

[0241] Examples of the present disclosure have been presented above so that those of ordinary skill in the art can implement and practice the present disclosure. Although the present disclosure has been described with reference to the examples, those skilled in the art can make various modifications and variations in the examples of the present disclosure. Therefore, the present disclosure is not intended to be limited to the examples set forth herein, but rather to the broadest scope consistent with the principles and features disclosed herein.

[0242] Implementations of the present disclosure can be used in a BS, a UE, or other devices in a wireless communication system.

Claims

1. A method for a user equipment (UE) to transmit an uplink signal in a wireless communication system, the method comprising the following steps: Perform physical downlink control channel (PDCCH) monitoring on a first cell based on a paging radio network temporary identifier (P-RNTI); Detect a downlink control information (DCI) format having a cyclic redundancy check (CRC) scrambled by the P-RNTI on the first cell; Obtain information about a second cell based on the DCI format; And Transmit a random access channel (RACH) on the second cell in a RACH opportunity.

2. The method according to claim 1, wherein, The information about the second cell is included in the DCI format.

3. The method according to claim 1, the method comprising the following steps: Decode a physical downlink shared channel (PDSCH) carrying a paging message including an identifier (ID) of the UE based on the DCI format.

4. The method according to claim 3, wherein, The information about the second cell is included in the DCI format.

5. The method according to claim 3, wherein, The paging message includes the information about the second cell and information about the RACH opportunity.

6. The method according to claim 1, wherein, The DCI format includes information about a third cell for receiving system information block 1 (SIB1), and the method includes the steps of: Receiving the SIB1 on the third cell, and Wherein the step of obtaining the information about the second cell based on the DCI format includes obtaining the information about the second cell based on the SIB1.

7. The method according to claim 6, wherein, The information about the second cell is included in the SIB1.

8. The method according to claim 6, wherein, The information about the second cell is included in other system information scheduled by the SIB1.

9. A user equipment (UE) configured to transmit an uplink signal in a wireless communication system, the UE comprising: At least one transceiver; At least one processor; And At least one computer memory, the at least one computer memory being operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including: Perform physical downlink control channel (PDCCH) monitoring on a first cell based on a paging radio network temporary identifier (P-RNTI); Detect a downlink control information (DCI) format having a cyclic redundancy check (CRC) scrambled by the P-RNTI on the first cell; Obtain information about a second cell based on the DCI format; and Transmit a random access channel (RACH) on the second cell in a RACH opportunity.

10. A processing device in a wireless communication system, the processing device comprising: At least one processor; And At least one computer memory, the at least one computer memory being operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including: Perform physical downlink control channel (PDCCH) monitoring on a first cell based on a paging radio network temporary identifier (P-RNTI); Detect a downlink control information (DCI) format having a cyclic redundancy check (CRC) scrambled by the P-RNTI on the first cell; Obtain information about a second cell based on the DCI format; and Transmit a random access channel (RACH) on the second cell in a RACH opportunity.

11. A computer-readable storage medium configured to store at least one program code including instructions, the instructions, when executed, causing at least one processor to perform operations, the operations including: Perform physical downlink control channel (PDCCH) monitoring on a first cell based on a paging radio network temporary identifier (P-RNTI); Detect a downlink control information DCI format having a cyclic redundancy check CRC scrambled by the P-RNTI on the first cell; Obtain information about a second cell based on the DCI format; And Transmit a RACH on the second cell in a random access channel RACH occasion.

12. A method for a base station BS to receive an uplink signal from a user equipment UE in a wireless communication system, the method comprising the steps of: Transmit a physical downlink control channel PDCCH carrying a downlink control information DCI format on the first cell, the DCI format having a cyclic redundancy check CRC scrambled by a paging radio network temporary identifier P-RNTI; and Receive a RACH from the UE on the second cell in a random access channel RACH occasion based on the DCI format.

13. A base station BS configured to receive an uplink signal from a user equipment UE in a wireless communication system, the BS comprising: At least one transceiver; At least one processor; And At least one computer memory, the at least one computer memory being operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including: Transmit a physical downlink control channel PDCCH carrying a downlink control information DCI format on the first cell, the DCI format having a cyclic redundancy check CRC scrambled by a paging radio network temporary identifier P-RNTI; and Receive a RACH from the UE on the second cell in a random access channel RACH occasion based on the DCI format.

14. The BS according to claim 13, wherein, Information about the second cell is included in the DCI format.

15. The BS according to claim 13, wherein, The operations include transmitting a physical downlink shared channel PDSCH carrying a paging message including an identifier ID of the UE based on the DCI format.

16. The BS according to claim 15, wherein, Information about the second cell is included in the DCI format.

17. The BS according to claim 15, wherein, The paging message includes the information about the second cell and information about the RACH occasion.

18. The BS according to claim 13, wherein, The DCI format includes information about a third cell for transmitting system information block 1 SIB1, and Wherein, the operations include transmitting the SIB1 on the third cell.

19. The BS according to claim 18, wherein, The information about the second cell is included in the SIB1.

20. The BS according to claim 18, wherein, The information about the second cell is included in other system information scheduled by the SIB1.

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