Method and apparatus for transmitting and receiving signal for detecting synchronization signal transmitted by cells having hierarchical structure for saving network energy in next generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system according to the present disclosure may comprise the steps of: obtaining, from a second cell, wake-up signal (WUS)-related information and synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) measurement timing configuration (SMTC)-related information of a first cell; transmitting a WUS to the first cell on the basis of the WUS-related information; determining a monitoring timing of an SSB from the first cell on the basis of the SMTC-related information; and monitoring the SSB from the first cell on the basis of the timing.

Description

Method and device for transmitting and receiving signals for detecting synchronization signals transmitted by cells having a hierarchical structure for saving network energy in a next-generation mobile communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. More specifically, the present disclosure relates to a signal transmission and reception method and device for receiving synchronization signals from base stations or cells in sleep mode when the base station or cell's transceiver terminal enters sleep mode in a network energy saving (NES) system that supports power saving technology.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] Meanwhile, in non-terrestrial network systems, mobility support methods and devices utilizing terminal location information have been proposed, and for terminals that can utilize these, there is a growing need for a mobility support method that utilizes relative location measurement between the terminal and the network, which is different from the existing signal strength-based method.

[0009] The present disclosure provides a method and device for improving the performance of reception of synchronization signals (SS) and physical broadcast channel (PBCH) (SS / PBCH) blocks (hereinafter referred to as SSB) and transmission of random access (RA) preambles of a terminal by utilizing power saving mode operation information of a network in a wireless communication system.

[0010] The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0011] In a wireless communication system according to an embodiment of the present disclosure, a method performed by a user equipment (UE) may include: acquiring wake-up signal (WUS) related information and SSB measurement timing configuration (SMTC) related information of a first cell from a second cell; transmitting a WUS to the first cell based on the WUS related information; determining a monitoring timing of an SSB (synchronization signal (SS) / physical broadcast channel (PBCH) block) from the first cell based on the SMTC related information; and monitoring the SSB from the first cell based on the timing.

[0012] In a wireless communication system according to one embodiment of the present disclosure, a method performed by a first cell may include the steps of providing, to a second cell, information related to a wake-up signal (WUS) of the first cell and information related to an SSB measurement timing configuration (SMTC) of the first cell; receiving a WUS from a user equipment (UE) based on the WUS-related information; performing a wake-up based on the WUS; and transmitting a synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) based on the SMTC-related information.

[0013] In a wireless communication system according to one embodiment of the present disclosure, a user equipment (UE) includes a transceiver; and a control unit, wherein the control unit is configured to obtain wake-up signal (WUS) related information and SSB measurement timing configuration (SMTC) related information of a first cell from a second cell, transmit a WUS to the first cell based on the WUS related information, determine a monitoring timing of an SSB (synchronization signal (SS) / physical broadcast channel (PBCH) block) from the first cell based on the SMTC related information, and monitor the SSB from the first cell based on the timing.

[0014] In a wireless communication system according to one embodiment of the present disclosure, in a first cell, a transceiver unit is provided; and a control unit, wherein the control unit is configured to provide information related to a wake-up signal (WUS) of the first cell and information related to an SSB measurement timing configuration (SMTC) of the first cell to a second cell, receive a WUS from a user equipment (UE) based on the WUS-related information, perform a wake-up based on the WUS, and transmit an SSB (synchronization signal (SS) / physical broadcast channel (PBCH) block) based on the SMTC-related information.

[0015] According to one embodiment of the present disclosure, in a wireless communication system, efficient SSB reception and RA preamble transmission of a terminal can be performed by effectively utilizing network power saving mode operation information. According to one embodiment of the present disclosure, the purpose is to improve SSB reception and RA preamble transmission performance, thereby reducing power consumption and transmission / reception delay of the terminal.

[0016] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0017] FIG. 1 is a diagram illustrating a next-generation mobile communication system structure that supports network energy saving according to an embodiment of the present invention.

[0018] FIG. 2 is a drawing for explaining a next-generation mobile communication system that supports network energy saving according to an embodiment of the present invention.

[0019] FIG. 3 is a diagram for explaining the NES mode of a base station or cell according to one embodiment of the present disclosure.

[0020] FIG. 4 illustrates an example of an initial connection procedure of a terminal according to an embodiment of the present disclosure.

[0021] FIG. 5 is a diagram illustrating an embodiment in which a terminal receives and utilizes synchronization signal block (SSB) measurement timing configuration (SMTC) information of a data cell from a sync cell.

[0022] FIG. 6 is a diagram illustrating an embodiment in which a terminal receives and utilizes SMTC information of a data cell from a sync cell.

[0023] FIG. 7 is a diagram illustrating an initial connection procedure of a terminal according to an embodiment of the present disclosure.

[0024] FIG. 8 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0025] FIG. 9 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.

[0026] The operating principles of the present invention will be described in detail below with reference to the attached drawings. In the following description of the present invention, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0027] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, and terms referring to various identification information are provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0028] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which the embodiments of the present disclosure may be applied, and 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure. It will be appreciated that each block of the processing flow diagrams and combinations of the flow diagrams can be executed by computer program instructions.

[0029] These computer program instructions may be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that the instructions executed by the processor of the computer or other programmable data processing apparatus create means for performing the functions described in the flowchart block(s). These computer program instructions may also be stored in a computer-available or computer-readable memory that can be directed to a computer or other programmable data processing apparatus to implement functions in a particular manner, so that the instructions stored in the computer-available or computer-readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flowchart block(s). The computer program instructions may also be installed on a computer or other programmable data processing apparatus, so that a series of operational steps are performed on the computer or other programmable data processing apparatus to create a computer-implemented process, so that the instructions executing on the computer or other programmable data processing apparatus can provide steps for performing the functions described in the flowchart block(s).

[0030] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function. In this case, the term '~unit' used in the present embodiment means software or a hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the '~unit' may perform certain roles. However, the '~unit' is not limited to software or hardware. The '~unit' may be configured to be on an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, the components and '~ units' may be implemented to reproduce one or more CPUs within a device or a secure multimedia card. Also, in an embodiment, the '~ unit' may include one or more processors.

[0031] For convenience of explanation, this disclosure uses terms and names defined in the 5GS and NR standards, which are standards defined by the 3rd Generation Partnership Project (3GPP). However, the present invention is not limited to these terms and names and can be equally applied to wireless communication networks that comply with other standards. For example, the present invention can be applied to the 3GPP 5GS / NR (5th generation mobile communication standard).

[0032] FIG. 1 is a diagram illustrating a next-generation mobile communication system structure that supports network energy saving according to an embodiment of the present invention.

[0033] Referring to FIG. 1, a next-generation mobile communication system supporting network energy saving may be composed of a next-generation base station (1-01, next generation node B, hereinafter referred to as gNode B, gNB, Node B or base station), a sync cell (1-05, synchronization cell, Sync cell), a data cell (1-06, 1-07, 1-08, Data cell), and a terminal (1-09, user equipment (UE)). Here, the gNB may be composed of a CU (1-02, central unit) and one or more DUs (1-03, 1-04, distributed units).

[0034] A CU can support one or more DUs, and a DU (1-03, 1-04) can support one Sync cell (1-05), or one Data cell (1-06, 1-07, 1-08), or one or more Data cells (1-06, 1-07, 1-08), or one or more Sync cells (1-05) and one or more Data cells (1-06, 1-07, 1-08).

[0035] UE(1-09) can access an external network via gNB through a data cell.

[0036] Therefore, in the description of the present invention, the description of a base station may be interpreted as a description of a cell, where the cell may be, for example, a sync cell or a data cell. In addition, the description of a cell may be a description of a base station operating the cell or a base station corresponding to the cell.

[0037] FIG. 2 is a drawing for explaining a next-generation mobile communication system that supports network energy saving according to an embodiment of the present invention.

[0038] Referring to FIG. 2, a next-generation mobile communication system supporting network energy saving is composed of a Sync cell (2-01, synchronization cell, or sync cell), a Data cell (2-02, 2-03, 2-04, data cell), and a terminal (2-05, user equipment (UE)).

[0039] The Sync cell (2-01) may be powered on. The state of a cell that is powered on may be referred to as active, and the Sync cell (2-01) according to the present disclosure may always be active. The main functions of an Active Sync cell, which is a Sync cell in an active state, may include at least some of the following functions.

[0040] - Broadcast of Sync cell-SSB (synchronization signal block)

[0041] - Broadcast of Sync cell-SIB (system information block)

[0042] - Paging message transmission

[0043] - Mobility support of RRC_IDLE and RRC_INACTIVE UEs in radio resource control (RRC) idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE)

[0044] - Transmission of resource information on the availability of receiving the wake-up signal (WUS (wake up signal)) of the data cell (Broadcast / multicast / unicast of Sync cell-SSB (synchronization signal block))

[0045] - Setting the data cell synchronization signal transmission interval (SSB measurement timing configuration (SMTC) of Data Cell(s) within the Sync cell, or within the frequency)

[0046] As described above, the sync cell (2-01) can be operated in a low frequency band (e.g., 700 MHz) that is easy to secure wide coverage in order to transmit a control signal to the terminal and efficiently support the mobility of the terminal in RRC idle mode or RRC deactivation mode.

[0047] Data cells (2-02, 2-03, 2-04) can be operated by being separately equipped with a receiver (wake-up receiver or wake-up radio, hereinafter WUR) that can receive a wake-up signal (hereinafter WUS) transmitted by a terminal (2-05) and a transceiver (main transceiver or main radio, hereinafter MR) that can transmit and receive all control signals and data except for the wake-up signal with the terminal (2-05). For example, data cells (2-02, 2-03, 2-04) can be operated by being separately equipped with an MR that can transmit and receive all control signals and data except for the WUS transmitted by the terminal (2-05) with the terminal (2-05). Since it is difficult to predict when the terminal (2-05) will transmit a WUS to the data cell (2-02, 2-03, 2-04), the data cell (2-02, 2-03, 2-04) may operate with the WUR power always turned on. On the other hand, when the terminal (2-05) and the data cell (2-02, 2-03, 2-04) do not transmit or receive data for a predetermined period of time, the data cell (2-02, 2-03, 2-04) may turn off or turn on the MR for efficient energy saving. The state of a cell in which the MR of the data cell (2-03, 2-04) is turned off may be referred to as inactive, and the state of a cell in which the MR of the data cell (2-02) is turned on may be referred to as active. The data cell (2-02, 2-03, 2-04) according to the present disclosure may be an active data cell or an inactive data cell depending on certain conditions.For example, a specific data cell (2-02, 2-03, 2-04) may change its state from inactive to active when it receives a WUS transmitted by a terminal (2-05) with a signal strength greater than a certain level. The main functions of the active data cell (2-02) may include at least some of the following functions.

[0048] - Receiving wake-up signal transmitted by terminal (WUS reception)

[0049] - Data cell synchronization signal transmission (Broadcast of Data cell-SSB (synchronization signal block))

[0050] - Data cell system information transmission (Broadcast of Data cell-SIB (system information block))

[0051] - Support of Random Access Procedure

[0052] - Support of RRC_CONNECTED UE and its mobility

[0053] The main functions of the Inactive Data cell (2-03, 2-04) may include the following:

[0054] - Receiving wake-up signal transmitted by terminal (WUS reception)

[0055] The main functions of the terminal (2-05) may include at least some of the following functions.

[0056] - Sync cell selection or Sync cell reselection for mobility support in RRC idle mode or RRC disabled mode.

[0057] - Reception of paging message transmitted by sync cell

[0058] - Performance of random access procedure with data cell and establishment of RRC connection with data cell

[0059] - Data transmission and reception in data cell and RRC connection mode

[0060] FIG. 3 is a diagram for explaining the NES mode of a base station or cell according to one embodiment of the present disclosure.

[0061] Referring to FIG. 3, if a base station supporting a WUR function is called a WUR BS (3-01) and a terminal supporting a WUR function is called a WUR UE (3-04), the WUR BS (3-01) may have an MR (3-02) for performing wireless communication with the WUR UE (3-04) and a WUR (3-03) for performing a Wake Up operation, and the WUR UE (3-04) may have an MR (3-05) for performing wireless communication with the WUR BS (3-01) and a WUR (3-06) for performing a Wake Up operation. At this time, the MR (3-02) of the WUR BS (3-01) can perform wireless communication with the MR (3-05) of the WUR UE (3-04) or other UE, and the WUR (3-03) of the WUR BS (3-01) can perform wireless communication with the WUR (3-06) of the WUR UE (3-04).

[0062] In one embodiment, the WUR may be a single, but logically distinct module, rather than two physically distinct modules as part of the MR. For example, the WUR (3-03) may be a single, but logically distinct module as part of the MR (3-02).

[0063] In one embodiment, the WUR may be physically or logically part of the MR. For example, the WUR (3-03) may be physically or logically part of the MR (3-02).

[0064] WUR BS and WUR UE can have the following operational configuration states.

[0065] 1. Full On state with both MR and WUR turned on

[0066] 2. MR On state where only MR is on and WUR is off

[0067] 3. Deep Sleep state where MR is off and only WUR is on

[0068] 4. Full Off state with both MR and WUR turned off

[0069] FIG. 4 illustrates an example of an initial connection procedure of a terminal according to an embodiment of the present disclosure.

[0070] According to Fig. 4, the Synchronization cell (hereinafter referred to as the sync cell) (4-02) is always awake and provides information to terminals (4-01) within the coverage radius.

[0071] Data cell (hereinafter referred to as data cell) (4-03) operates in Deep Sleep mode most of the time, if possible, and can wake up from Deep Sleep mode and turn on MR according to certain judgment criteria after receiving WUS of terminal (4-01) through WUR.

[0072] A sync cell (4-02) determines how multiple data cells (4-03) with overlapping coverage within its coverage can receive WUS (periodic, aperiodic, etc.) through which resources (radio resources such as time and frequency) using WUR and shares this information with the data cells. Here, the information shared from the data cells may be WUS information (WUS info). (4-10)

[0073] The sync cell can transmit the WUS information shared from the data cells to an unspecified number of terminals by including it in a broadcast signal, such as a synchronization signal (PSS, SSS), a master information block (MIB) included in an SSB, or a system information block (SIB). (4-20)

[0074] Accordingly, a base station or cell (e.g., a sync cell, hereinafter referred to as a base station) can transmit a signal to a terminal to enable transmission of WUS. More specifically, the base station can transmit a signal containing all or part of the following WUS information to the terminal.

[0075] - Any resource information such as time / frequency at which WUS can be transmitted,

[0076] ■ Resource information including subframe / raioframe / slot time information that has some rule that repeats periodically, for example

[0077] ■ For example, resource information including WUS transmission time duration, absolute time, number of slots, number of frames, etc.

[0078] ■ Resource information including absolute time, number of slots, number of frames, timer, etc., to indicate a start time that can be transmitted after a certain period of time after receiving the signal.

[0079] ■ Resource information including, for example, the identification (ID) of a frequency band that refers to a certain frequency band,

[0080] ■ Resource information including, for example, the ID of the resource block indicating a starting frequency, the bandwidth indicating the frequency bandwidth, the number of unit resource block frequency bandwidths, etc.

[0081] ■ Resource information including, for example, the ID of the reference frequency to indicate the starting frequency from a certain reference frequency, the bandwidth indicating the difference between the reference frequency and the starting frequency, the number of unit resource block frequency bandwidths, etc.

[0082] - A sequence ID or list of sequence IDs that can specify sequences that can be transmitted to WUS.

[0083] - An ID of information or a list of information IDs that indicate the type of information that can be transmitted to WUS.

[0084] - A list of condition IDs or condition IDs that indicate the type of condition that can transmit WUS.

[0085] - An indicator that indicates that the terminal can transmit WUS when the base station is operating in Deep Sleep mode.

[0086] The above WUS information may be information about a base station transmitting the signal. The information may be information about a base station (or cell) adjacent to the base station transmitting the signal, and in this case, it may include a base station ID or cell ID or a base station ID list or a cell ID list.

[0087] The above WUS information may be applied to one or more base stations or cells, and may include a list of base station IDs or cell IDs that can use the corresponding WUS transmission information.

[0088] The above WUS information may be applied equally to all adjacent base stations or cells (cell common information), and in this case, may include an indicator (e.g., 1 bit indicator) that notifies the terminal of the relevant information.

[0089] The above WUS information may have a structure and format similar to or identical to PRACH (Physical Random Access Channel) configuration information.

[0090] The above WUS information may include an indicator that can distinguish the data cell currently operating in Deep Sleep mode, for example, an indicator in the form of including a 1-bit indicator in each data cell information.

[0091] The above WUS information may include an indicator that can distinguish the data cell in which the MR is currently on, for example, an indicator in the form of including a 1-bit indicator in each data cell information.

[0092] The above WUS information may implicitly imply that all data cells included in the information are operating in deep sleep mode. In other words, the base station may configure and transmit the above information only for data cells currently operating in deep sleep.

[0093] A signal including the above WUS information may be included in a broadcast signal transmitted by a base station to a terminal, for example, an MIB included in an SSB, or in any SIB. Alternatively, a signal including all or part of the above WUS information may be included and transmitted in a unicast signal transmitted by a base station specifically to a terminal, for example, an RRC signal, a MAC signal, or a PHY signal.

[0094] A WUR UE (4-01) transmits a WUS to a WUR BS (4-03) operating in a Deep Sleep state, and the WUR BS can receive the WUS. Here, the WUS transmitted to the WUR BS operating in a Deep Sleep state may be an uplink wake-up signal (UL WUS). (4-40)

[0095] At this time, WUS can be received through WUR of WUR BS.

[0096] The base station that receives the WUS wakes up from the Deep Sleep state and transitions to the MR On state or Full On state. (4-50)

[0097] In one embodiment, the WUR may be a single, but logically distinct, module, rather than two physically different modules as part of the MR.

[0098] In one embodiment, the WUR may be part of the MR, both physically and logically.

[0099] In the above scenarios, the terminal (4-01) may be an idle terminal operating in IDLE / Inactive mode, or may be a terminal connected to some other gNB and operating in Connected mode.

[0100] In the case of a terminal (4-01) operating in Connected mode, the terminal may receive WUS information (WUS info) from the gNB to which the terminal is connected through a broadcast signal (MIB, SIB) or a Unicast signal (RRC signal, MAC-CE, PHY signal), and the terminal may use it to transmit WUS to another adjacent base station or cell (e.g., Data cell).

[0101] In addition, the sync cell (4-02) may share the WUS information of each data cell (4-03) with the terminal (4-01), and if the downlink resource synchronization of the data cell (4-03) differs from the downlink resource synchronization of the sync cell (4-02), the sync cell may include this synchronization difference between cells in the signal transmitted to the terminal (4-01). Using this information, the terminal (4-01) may identify the synchronization of different data cells (4-03) and specify the WUS resource location accordingly.

[0102] If the downlink resource synchronization of the corresponding data cell (4-03) is not different from the downlink resource synchronization of the sync cell (4-02), the sync cell (4-02) may implicitly inform the terminal (4-01) of this by not providing information about this, for example, the synchronization difference between each data cell and the sync cell. Alternatively, an indicator that directly informs that the synchronization of each data cell is the same as the sync cell may be included in a signal transmitted to the terminal (4-01). The indicator may be a 1-bit indicator that informs that the synchronization of all data cells and the sync cell is the same, or a 1-bit indicator included in the WUS information of each data cell that informs that the synchronization of each data cell and the sync cell is the same.

[0103] Additionally, the sync cell (4-02) may include location information of each data cell (4-03) in the signal and transmit it to the terminal (4-01) to determine the connection of the terminal (4-01).

[0104] Additionally, the sync cell (4-02) may transmit to the terminal (4-01) a list of services that each data cell (4-03) can support or cannot support in the signal in order to determine the connection of the terminal (4-01).

[0105] The terminal (4-01) can select cells to transmit WUS based on information received from the sync cell (4-02). (4-30)

[0106] For example, a terminal (4-01) may compare the location of the terminal (4-01) with the locations of each data cell (4-03) and then decide to transmit a WUS by selecting the closest data cell or K data cells in the closest order. The K may be included in a signal containing information about the data cells transmitted by the base station.

[0107] For example, the terminal (4-01) may decide to transmit a WUS by selecting a data cell having temporally closest WUS resources that can be transmitted the fastest, or by selecting K data cells in the temporally closest order. The K may be included in a signal containing information about the data cells transmitted by the base station to the terminal.

[0108] For example, the terminal (4-01) may decide to transmit a WUS by selecting K data cells in the order of best or best data cell predicted to have the best received signal performance, such as reference signal received power (RSRP), reference signal received quality (RSRQ), channel quality indicator (CQI), signal to noise ratio (SNR), signal to interference plus noise ratio (SINR), etc., based on the record of reception of any signal, such as a synchronization signal, previously transmitted by each data cell (4-03). The K may be included in a signal including information on the data cells transmitted by the base station to the terminal.

[0109] Afterwards, the terminal (4-01) transmits a WUS signal to the selected data cells (4-03). (4-40)

[0110] If the above WUS signal is a single signal having a single sequence, etc. that can be transmitted as one identical resource that different data cells can receive simultaneously, the terminal (4-01) may transmit one WUS signal so that one or more data cells (4-03) can receive it simultaneously.

[0111] At this time, WUS can be received through WUR of WUR BS.

[0112] Base stations operating data cells that have received a WUS perform an operation to determine which base station operating the data cell will wake up. This decision operation can be one of the same operations described in Figure 6 (4-50).

[0113] The awakened data cell performs normal wireless communication cell operations, such as transmitting SSB and supporting terminal connections.

[0114] According to FIG. 4, a terminal must go through various procedures before initially connecting and transmitting and receiving data, and may experience connection delays accordingly. For example, the terminal may experience various delays, such as a delay in receiving an SSB from the aforementioned Sync cell, a transmission delay until the aforementioned WUS is transmitted to the Data Cells, a delay occurring while the Data Cells are waking up, a delay in receiving an SSB until the Data Cells transmit an SSB, and a Random Access delay, before establishing a connection.

[0115] In order to prevent power waste and performance degradation due to these various delays, the present disclosure proposes to transmit SSB transmission resource information of a data cell, for example, SMTC, to a terminal in advance from a sync cell so that the terminal can efficiently detect (or monitor) and receive SSB of the data cell.

[0116] Figure 5 illustrates an embodiment in which a terminal receives and utilizes SMTC information of a Data Cell from a Sync cell.

[0117] Referring to FIG. 5, the terminal can receive SMTC information on which the SSB of each data cell will be transmitted from the sync cell. (5-10) The SMTC signal can be included in a broadcast signal transmitted by the base station to the terminal. For example, the SMTC signal can be included in an MIB included in an SSB, or in any SIB. Alternatively, the SMTC signal can be included in a unicast signal transmitted by the base station specifically to the terminal. For example, the SMTC signal can be transmitted by being included in an RRC signal, a MAC signal, or a PHY signal.

[0118] SMTC Information

[0119] The above SMTC information may have all or part of an information structure including the following information.

[0120] - Periodicity of a series of data cells transmitting SSB

[0121] - Offset value that indicates the starting point of SMTC where a series of data cells start transmitting SSB

[0122] - The length (duration) of SMTC, which is the length of a series of data cells transmitting SSB.

[0123] - The center frequency of a series of data cells or its corresponding index (ARFCN, Absolute Radio Frequency Channel Number)

[0124] - Sync cell index (cell ID) to which a series of data cells belong

[0125] - offset1, which refers to the absolute time difference between the downlink synchronization of a series of data cells and the downlink synchronization of a sync cell.

[0126] - offset2, which refers to the ratio between the subframe size (time length) of a series of data cells and the subframe size (time length) of a sync cell.

[0127] In one embodiment, the terminal may receive the above information from a base station or cell (e.g., a Sync cell) in a form similar to the example in [Table 1] below. An example of SMTC is as shown in [Table 1] below.

[0128] [Table 1]

[0129]

[0130] duration: The duration of the measurement window in which synchronization signals (SS) and physical broadcast channel (PBCH) (SS / PBCH) blocks are received. It is given in the number of subframes.

[0131] periodicityAndOffset: The period and offset of the measurement window in which SS / PBCH blocks are received, see 5.5.2.10. Periodicity and offset are given in subframe numbers.

[0132] The terminal can calculate or determine the SSB measurement timing through the received SMTC information. (5-20) The terminal can calculate the period and offset values ​​through the received periodicityAndOffset parameters as follows. The first subframe of the measurement window identified based on each SMTC information can be calculated as follows through the subframe number (SFN) for a reference cell:

[0133] SFN modT= (FLOOR (Offset / 10));

[0134] if thePeriodicityis largerthansf5:

[0135] subframe =Offsetmod 10;

[0136] else:

[0137] subframe =Offsector (Offset+5);

[0138] withT= CEIL(Periodicity / 10).

[0139] Any of the above reference cells may be a serving Sync cell.

[0140] Any of the above reference cells may be the cell that transmitted the corresponding SMTC information.

[0141] Any of the above reference cells may be specific data cells.

[0142] Any of the above reference cells can be any other cell.

[0143] In one embodiment, the terminal can derive the SMTC value below by reflecting the above information and offset1 and offset2.

[0144] - duration_data_cell = duration*offset2

[0145] ■ The duration of the measurement window of the SSB to be transmitted by the data cell is derived by multiplying the calculated duration value by offset2, which is the ratio between the subframe sizes of the data cell and the sync cell.

[0146] - subframe_data_cell = subframe + offset1;

[0147] ■ The subframe start point of the measurement window of the SSB to be transmitted by the data cell is derived by adding offset1, which is the time difference between the data cell and the sync cell, to the subframe value calculated above.

[0148] ◆ if thePeriodicityis larger thansf5:

[0149] ● subframe = (Offsetmod 10) +offset1;

[0150] ◆ else:

[0151] ● subframe = (Offset+offset1) or (Offset+offset1+5);

[0152] The above sf5 may be a subframe of a different size. For example, the above sf5 may be sf10. Accordingly, the above (Offset+offset1+5) value may be changed to (Offset+offset1+10), etc.

[0153] The above-mentioned sync cell may also provide SMTC information for data cells belonging to adjacent frequencies other than the corresponding frequency to the terminal. For example, when the sync cell bundles SMTC information for a certain frequency into a single SMTC information element (IE), the sync cell may transmit a signal including one or more such SMTC IEs to the terminal.

[0154] The above SMTC information object may include an indicator for the unit to which the SMTC is to be applied. For example, the above SMTC information object may include the following indicators.

[0155] - A directive for a list of cell IDs (or one cell ID) to which SMTC will be applied.

[0156] ■ The above cell ID list may be a data cell ID list.

[0157] ■ The above cell ID list may be a Sync cell ID list.

[0158] ■ The above cell ID list can be a data cell and a sync cell ID list.

[0159] ■ The above cell ID list is a Data cell and a Sync cell ID list, and can be transmitted as two lists with different names so that each can be distinguished as a type of cell.

[0160] ■ The above cell ID list is a list of Data cell and Sync cell IDs, and may be a list that includes indicators indicating different types of cells so that each can be distinguished as to what type of cell it is, for example, a 1-bit indicator where 0 indicates a Sync cell and 1 indicates a Data cell, for each cell ID or for each group of cell IDs.

[0161] ■ The above cell ID list is a list of data cell and sync cell IDs, and may be a list including indicators indicating different types of cells so that each can be distinguished as to what type of cell it is, for example, indicators indicating data cells or sync cells defined (or promised) to the base station and terminal in advance, for each cell ID or for each group of cell IDs.

[0162] - An indicator for the list of frequencies (or one frequency band) to which SMTC is to be applied.

[0163] The above SMTC is not allocated by frequency, but can be configured to group data cells within a sync cell as a single entity. For example, each sync cell can be configured to have a different SMTC. The terminal may be aware that the SMTC is for the data cells within the sync cell.

[0164] The above Sync cell may also provide SMTC information for data cells belonging to adjacent Sync cells other than the Sync cell itself to the terminal. For example, when a Sync cell and SMTC information for the Sync cell are bundled into a single SMTC information object (information element, hereinafter referred to as IE), the Sync cell may transmit a signal including one or more such SMTC IEs to the terminal.

[0165] The signal through which the above SMTC information and cell information are transmitted may be included, for example, in a MIB included in an SSB, or in any SIB.

[0166] In one embodiment, a new SIB can be set up and allocated as follows to provide information and SMTC of the data cell.

[0167] A terminal that receives SMTC information from a sync cell can recognize when and with what resources the data cell will transmit SSB through the information, and (5-20) perform an operation to reduce power consumption or waste, such as a DRX operation, until that point in time.

[0168] The terminal receives the SSB transmitted by the data cell according to the SMTC information. (5-30)

[0169] Figure 6 illustrates an embodiment in which a terminal receives and utilizes SMTC information of a Data Cell from a Sync cell.

[0170] According to Fig. 6, a terminal can receive WUS information from a sync cell. The WUS information may be the information described above in Fig. 4. (6-10)

[0171] The terminal can receive SMTC information regarding the SSB transmission of each data cell from the sync cell. The SMTC signal may be the information described above in Fig. 5. (6-15)

[0172] A terminal that receives WUS information from a sync cell can recognize when and with what resources to transmit WUS to a data cell operating in deep sleep mode through the information, and (6-20) can perform an operation to reduce power consumption or waste, such as a DRX operation, until that point in time.

[0173] A terminal that receives SMTC information from a sync cell can recognize when and with what resources the data cell will transmit SSB through the information, and (6-30) can perform an operation to reduce power consumption or waste, such as a DRX operation, until that point in time.

[0174] The terminal transmits WUS to data cells using the above WUS information. (6-40)

[0175] Data cells that receive WUS through WUR wake up after going through a series of judgment procedures. (6-50)

[0176] The awakened data cells transmit SSB within the planned and announced SMTC, and the terminal receives the SSB transmitted by the data cell according to the SMTC information. (6-60)

[0177] Relative SMTC Config.

[0178] In one embodiment, SMTC may be set to a relative time value rather than an absolute time value. The sooner the data cells wake up and send SSBs, the less delay the terminal has to wait for the SSBs, allowing faster access to the data cells. To this end, the base station may set the SMTC of data cells to a relative time value that is relative to a specific reference signal, rather than an absolute time resource on a time axis, so that the terminal can receive SSBs more quickly.

[0179] For example, a base station may configure SMTC to start from a location having a specific offset value, for example, offset3, based on a specific downlink signal, for example, a downlink signal transmitted by a sync cell that configures SMTC. Various signals or resources that serve as the reference may be used, such as the following:

[0180] - Downlink signal containing information for setting SMTC of data cells

[0181] - A specific SSB signal referred to as an SSB ID

[0182] - A specific CSI-RS signal referred to as a CSI-RS ID.

[0183] - WUS resources that can receive WUS that the terminal can transmit

[0184] - Any other downlink or uplink signal or resource

[0185] The signal that serves as the above reference may be determined and specified in the standard, or may be indicated with an ID in the form of a list.

[0186] The above offset3 can be set in various units. For example, it can be set in subframe units, slot units, radio frame units, or any absolute time unit.

[0187] In one embodiment, the terminal may receive the above information in a form similar to the example below. An example of SMTC is as shown in [Table 2] below.

[0188] [Table 2]

[0189]

[0190] The terminal can calculate or determine the SSB measurement timing using the received SMTC information. The terminal can calculate the period and offset values ​​using the received periodicityAndOffset parameters as follows. The first subframe of each SMTC can be calculated as follows using the subframe number (SFN) for a reference cell:

[0191] SFN modT= (FLOOR (Offset / 10));

[0192] if thePeriodicityis largerthansf5:

[0193] subframe = (Offsetmod 10) +offset3;

[0194] else:

[0195] subframe = (Offset+offset3) or (Offset+offset3+5);

[0196] withT= CEIL(Periodicity / 10).

[0197] The above sf5 may be a subframe of a different size, for example, sf10. Accordingly, the above (Offset+offset3+5) value may be changed to (Offset+offset3+10), etc.

[0198] In addition, the base station can take the following measures to enable Data Cells to transmit SSB to the terminal more quickly:

[0199] In one embodiment, the base station may set the SMTC of the Data Cells for a long period of time (a very long duration) and transmit the SSB within it as quickly as possible.

[0200] In one embodiment, the base station may configure the SMTCs of data cells to repeat with a short period (very short periodicity), and transmit SSBs from the SMTC that can do so as quickly as possible. At this time, specific data cells may have a periodicity different from the SMTC. At this time, the periodicity of the SMTC of specific data cells may be a multiple of the period. In this case, the SSB transmitted by a specific data cell may be transmitted only from a selected portion of the SMTCs, rather than from all SMTCs.

[0201] In one embodiment, the base station may set one or more SMTCs with different periods and lengths for data cells, and may set an indicator that can designate each SMTC. Thereafter, the base station may transmit another indicator to the terminal that designates which SMTC the data cells are currently transmitting SSB through, and by transmitting an indicator designating one of the SMTCs in the indicator, the base station may inform the terminal of the SMTC that is currently in use or will be used from now on, and allow the terminal to receive the SSB of the data cells through the SMTC.

[0202] For example, a base station can transmit to a terminal an indicator indicating which SMTC the data cells transmit SSB through, and an indicator indicating the SMTC. Based on the indicators received from the base station, the terminal can identify the SMTC currently in use or to be used from now on, and can receive the SSB of the data cells through the corresponding SMTC.

[0203] Through the various embodiments proposed above, the base station can transmit SSB to the terminal more quickly, thereby reducing the delay time that occurs when the terminal performs the initial access procedure required to access the data cell, thereby enabling faster access and data transmission and reception.

[0204] Additionally, optimization is possible by allowing the data cell to flexibly change the location of the SSB it wants to transmit to the terminal.

[0205] In one embodiment, the base station may perform the following actions for newly awakened data cells when there are data cells that are already awake and transmitting SSB.

[0206] - The base station can transmit SSB in the same SMTC as the existing data cells for newly awakened data cells.

[0207] - The base station can assign a different SMTC to newly awakened data cells than the existing data cells and transmit SSB from the new SMTC. In this case,

[0208] ■ 1. The base station can configure one or more SMTCs that are different from the SMTCs in which existing data cells transmit SSB and the SMTCs in which newly awakened data cells transmit SSB, and provide the corresponding information to the terminals. For example, the base station can configure a new SMTC IE including the ID list and SMTC information of newly awakened data cells, and add the new IE to the signal transmitting the existing SMTC IE to create a signal composed of two or more SMTC IEs and transmit the signal to the terminals.

[0209] ■ 2. The base station can change the SMTC in which existing data cells transmit SSB to SMTC in which newly awakened data cells transmit SSB, and can also change the existing data cells to transmit SSB according to the new SMTC. In this case, the base station can change the signal transmitting the existing SMTC IE to the new SMTC and transmit the corresponding signal to the terminals.

[0210] ■ 3. The base station can create a single SMTC by combining the SMTCs in which existing data cells transmit SSB and the SMTCs in which newly awakened data cells transmit SSB, and change the data cells to transmit SSB according to this new SMTC. In this case, the base station can change the existing SMTC to the new SMTC instead of the signal that transmits the existing SMTC IE and transmit the corresponding signal to the terminals.

[0211] In one embodiment, the terminal may receive the above information in a form similar to the example below. An example of the SMTC IE list is as shown in [Table 3] below.

[0212] [Table 3]

[0213]

[0214] An example of SMTC IE is shown in [Table 4] below.

[0215] [Table 4]

[0216]

[0217] The above SMTC may be an SMTC for the corresponding frequency and may be applied not only to data cells belonging to one sync cell but also to all data cells existing in the corresponding frequency.

[0218] The above SMTC may be an SMTC for a series of data cells belonging to the corresponding sync cell, or may be an SMTC applied only to the corresponding data cells.

[0219] FIG. 7 is a diagram illustrating an initial connection procedure of a terminal according to an embodiment of the present disclosure.

[0220] According to Fig. 7, the terminal can receive WUS information from the Sync cell. (7-10) The WUS information may be the information described above in Fig. 4 or Fig. 6.

[0221] The terminal can receive SMTC information on which the SSB of each data cell will be transmitted from the sync cell. (7-15) The SMTC signal may be the information described above in FIG. 5 or FIG. 6.

[0222] A terminal that receives WUS information from a sync cell can recognize when and with what resources to transmit WUS to a data cell operating in deep sleep mode through the WUS information, and (7-20) can perform an operation to reduce power consumption or waste, such as a DRX operation, until that point in time.

[0223] A terminal that receives SMTC information from a sync cell can recognize when and with what resources a data cell will transmit SSB through the SMTC information, and (7-30) perform an operation to reduce power consumption or waste, such as a DRX operation, until that point in time.

[0224] The terminal can transmit WUS to data cells using the above WUS information. (7-40)

[0225] Data cells that receive WUS through WUR wake up after going through a series of judgment procedures. (7-50)

[0226] The awakened Data Cells transmit SSB within the planned and announced SMTC, and the terminal can receive the SSB transmitted by the Data Cell according to the SMTC information. (7-60)

[0227] The terminal can compare the received SSBs and select or decide on a specific cell to perform the connection. (7-70)

[0228] In one embodiment, the terminal may perform a comparison to select a specific cell to connect to, including not only the data cells that are now awake and transmitting SSB, but also any cells that were already awake and transmitting SSB, and select the best cell.

[0229] In one embodiment, the terminal may select a rank for each cell based on some formula or rule and select the cell with the highest rank. The method by which the terminal selects the rank may apply various rules and conditions, and may follow a standard.

[0230] According to one embodiment, a terminal can identify PRACH resources capable of transmitting an RA preamble to a given cell through MIB information included in a received SSB, or SIB information transmitted together with or subsequently transmitted with the SSB. In other words, the terminal can identify or acknowledge PRACH resource information included in a MIB or SIB. (7-80)

[0231] Relative PRACH Config.

[0232] In one embodiment, the PRACH resource that the terminal transmits the Random Access Preamble for accessing the base station may be set to a relative time value rather than an absolute time value. The sooner the PRACH resource is allocated and the Preamble is received after the data cells wake up, the shorter the delay time for the terminal to wait for the corresponding PRACH resource, and the faster the terminal can access the data cell. To this end, the base station may set the PRACH resource of the data cells to a relative time value at a relative position with respect to a specific reference signal rather than an absolute time resource on a certain time axis, thereby allowing the terminal to transmit the Random Access Preambles more quickly.

[0233] For example, a base station may configure a PRACH resource to start from a location having a specific offset value, for example, offset4, based on a specific downlink signal, for example, a downlink signal transmitted by a cell that configures the PRACH resource. Various signals may be used as the reference signal, as follows.

[0234] - Downlink signal containing information for setting SMTC of data cells

[0235] - A specific SSB signal referred to as an SSB ID

[0236] - SMTC of the corresponding cell included in the SMTC signal

[0237] - A specific CSI-RS signal referred to as a CSI-RS ID.

[0238] - WUS resources that can receive WUS that the terminal can transmit

[0239] The signal that serves as the above reference may be determined and specified in the standard, or may be indicated with an ID in the form of a list.

[0240] The above offset4 can be set in various units. For example, it can be set in subframe units, slot units, radio frame units, or any absolute time unit.

[0241] In one embodiment, the terminal may receive the above information in a form similar to the example below. An example of PRACH resource configuration is as shown in [Table 5] below.

[0242] [Table 5]

[0243]

[0244] Here, prach-ConfigurationIndex is an index of a resource that can tell when the terminal can transmit the Preamble. For example, in the table below, the terminal can identify the resource through various parameters indicated by one index.

[0245] As an example of the mapping between the index and resources for PRACH resource configuration, Random access configurations for FR1 and paired spectrum / supplementary uplink are as shown in [Table 6] below.

[0246] [Table 6]

[0247]

[0248]

[0249]

[0250]

[0251]

[0252]

[0253]

[0254]

[0255]

[0256]

[0257] In one embodiment, the base station of the cell may select the most appropriate resource among resources including resources located at an offset value of 4 from the reference signal, and transmit the PRACH resource configuration signal including an indicator of the resource to the terminal.

[0258] The above appropriate PRACH resources can be determined by the terminal according to certain criteria as follows.

[0259] - If there is only one PRACH resource configuration that includes a resource that is located at a distance of the offset 4 value, select the index that refers to the PRACH resource.

[0260] - If there is more than one PRACH resource setting that includes resources that are separated by the offset 4 value, select the index with the smallest / largest value.

[0261] - If there is more than one PRACH resource configuration that includes resources that are separated by the offset 4 value, the index with the shortest / longest period is selected.

[0262] In one embodiment, the terminal may receive the above information in a form similar to the example below.

[0263] An example of PRACH resource settings is shown in [Table 7] below.

[0264] [Table 7]

[0265]

[0266] Here, prach-ConfigurationIndex is an index of a resource that can determine the time when the terminal can transmit the Preamble. For example, the terminal can identify the resource through various parameters indicated by one index in Table 6 above.

[0267] When the above offset4 is set, the base station and the terminal recognize that the corresponding PRACH resource setting value is delayed by the offset, understand that the starting point of the corresponding PRACH resource is set by delaying it by the offset4, and can use the delayed resource as a PRACH resource as follows.

[0268] - PRACH start resource = start resource pointed to by prach-ConfigurationIndex + offset4

[0269] In another embodiment, when the offset4 is set, the base station and the terminal recognize that the corresponding PRACH resource setting value is pulled forward by the offset, understand that the starting point of the corresponding PRACH resource is set forward by the offset4, and can use the delayed resource as a PRACH resource.

[0270] - PRACH start resource = start resource pointed to by prach-ConfigurationIndex - offset4

[0271] In addition, the base station may take the following measures to enable the terminal to transmit the RA preamble to the data cells more quickly.

[0272] In one embodiment, the base station may configure the PRACH resources of the data cells to repeat with a short period (very short periodicity), and within that, the terminal may transmit the RA preamble on the PRACH resource that can transmit it as quickly as possible. At this time, specific data cells may have a periodicity different from the PRACH resources. At this time, the periodicity may be a multiple of the period of the PRACH resources of specific data cells. In this case, the RA preamble allocated to a specific data cell may be transmitted only on a selected portion of the PRACH resources, rather than on all PRACH resources.

[0273] In one embodiment, the base station may set one or more PRACH resources with different periods and lengths for data cells, and may set an indicator that can designate each resource. Thereafter, the base station may transmit to the terminal another indicator that designates which PRACH resource the data cells currently use to receive the RA preamble. By transmitting an indicator designating the one PRACH resource in the indicator, the base station may inform the terminal of the PRACH resource that is currently being used or will be used from now on, and may enable the terminal to transmit the RA preamble to the data cells through the PRACH resource. Through the various proposed embodiments, the base station may transmit the RA preamble to the terminal more quickly, thereby reducing the delay time that occurs when the terminal performs the initial access procedure required to access the data cell, thereby enabling faster access and data transmission and reception.

[0274] Additionally, optimization is possible by allowing the data cell to flexibly change the location of the RA preamble it wants to allocate to the terminal.

[0275] FIG. 8 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0276] Referring to FIG. 8, the base station (800) may include a transceiver (810), a control unit (base station control unit) (820), and a storage unit (830). The transceiver (810), the control unit (820), and the storage unit (830) may operate according to at least one or a combination of the communication methods of the base station (800) described above. In addition, a network device may also correspond to the structure of the base station (800). However, the components of the base station (800) are not limited to the examples described above. For example, the base station (800) may include more or fewer components than the components described above. For example, the base station (800) may include a transceiver (810) and a control unit (820). In addition, the transceiver (810), the control unit (820), and the storage unit (830) may be implemented in the form of a single chip.

[0277] The transceiver (810) is a general term for the receiver of the base station (800) and the transmitter of the base station (800), and can transmit and receive signals with terminals, other base stations (800), or other network devices. At this time, the transmitted and received signals may include control information and data. The transceiver (810) may, for example, transmit system information to the terminal, and transmit a synchronization signal or a reference signal. To this end, the transceiver (810) may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-down-converts a received signal. However, this is only one embodiment of the transceiver (810), and the components of the transceiver (810) are not limited to the RF transmitter and the RF receiver. The transceiver (810) may include a wired or wireless transceiver (810), and may include various configurations for transmitting and receiving signals. In addition, the transceiver (810) can receive a signal through a communication channel (e.g., a wireless channel) and output it to the control unit (820), and transmit the signal output from the control unit (820) through the communication channel. In addition, the transceiver (810) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to a terminal, another base station (800), or another entity through a wired or wireless network.

[0278] The storage unit (830) can store programs and data required for the operation of the base station (800). In addition, the storage unit (830) can store control information or data included in a signal acquired from the base station (800). The storage unit (830) can be configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, the storage unit (830) can store at least one of information transmitted and received through the transceiver unit (810) and information generated through the control unit (820).

[0279] In the present disclosure, the control unit (820) may be defined as a circuit or an application-specific integrated circuit or at least one processor. The processor may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit (820) may control the overall operation of the base station (800) according to the embodiment proposed in the present disclosure. The control unit (820) may control a series of procedures by which the base station (800) may operate according to the embodiment of the present disclosure described above. For example, the control unit (2202) may perform or control the operation of a terminal to perform at least one or a combination of the methods according to the embodiments of the present disclosure. For example, the control unit (820) may control the signal flow between each block to perform an operation according to the flowchart described in the embodiments of the present disclosure.

[0280] FIG. 9 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.

[0281] Referring to FIG. 9, the terminal (900) may include a transceiver (910), a control unit (terminal control unit) (920), and a storage unit (930). The transceiver (910), the control unit (920), and the storage unit (930) may operate according to at least one or a combination of the communication methods of the terminal (900) described above. However, the components of the terminal (900) are not limited to the examples described above. For example, the terminal (900) may include more or fewer components than the components described above. For example, the terminal (900) may include a transceiver (910) and a control unit (920). In addition, the transceiver (910), the control unit (920), and the storage unit (930) may be implemented in the form of a single chip.

[0282] The transceiver (910) is a general term for the receiver of the terminal (900) and the transmitter of the terminal (900), and can transmit and receive signals with a base station, another terminal (900), or a network entity. The signals transmitted and received with the base station may include control information and data. The transceiver (910) may, for example, receive system information from the base station and receive a synchronization signal or a reference signal. To this end, the transceiver (910) may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-down-converts the received signal. However, this is only one embodiment of the transceiver (910), and the components of the transceiver (910) are not limited to the RF transmitter and the RF receiver. In addition, the transceiver (910) may include a wired or wireless transceiver (910), and may include various configurations for transmitting and receiving signals. In addition, the transceiver (910) can receive a signal through a wireless channel and output it to the control unit (920), and transmit the signal output from the control unit (920) through the wireless channel. In addition, the transceiver (910) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to a network entity through a wired or wireless network.

[0283] The storage unit (930) can store programs and data required for the operation of the terminal (900). In addition, the memory can store control information or data included in a signal obtained from the terminal (900). The storage unit (930) can be configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD.

[0284] In the present disclosure, the control unit (920) may be defined as a circuit or application-specific integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit (920) may control the overall operation of the terminal (900) according to the embodiment proposed in the present disclosure. For example, the control unit (920) may control the signal flow between each block to perform operations according to the flowchart described above.

[0285] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0286] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present invention.

[0287] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0288] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present invention via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present invention.

[0289] In the specific embodiments of the present disclosure described above, components included in the invention are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present invention is not limited to singular or plural components. Even components expressed in the plural form may be composed of singular elements, or even components expressed in the singular form may be composed of plural elements.

[0290] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, A step of acquiring information related to a wake-up signal (WUS) of a first cell and information related to a SSB measurement timing configuration (SMTC) of a second cell; A step of transmitting WUS to the first cell based on the above WUS related information; A step of determining a monitoring timing of an SSB (synchronization signal (SS) / physical broadcast channel (PBCH) block) from the first cell based on the SMTC-related information; and A method comprising the step of monitoring the SSB from the first cell based on the timing.

2. In paragraph 1, The above SMTC related information includes SMTC information of the first cell, and A method wherein the SMTC information includes at least one of a periodicity, an offset, or a duration of a window for monitoring the SSB transmitted by the first cell.

3. In paragraph 1, The first cell and the second cell are assigned to the same frequency band, The above SMTC related information includes SMTC information for data cells in frequency bands adjacent to the above frequency band, and The above SMTC related information is set on a cell basis.

4. In paragraph 1, The above SMTC related information includes information related to the relative time for monitoring timing of the SSB transmitted by the first cell, The information related to the above relative time includes information about a reference signal and offset information from the reference signal, and A method in which the above-mentioned reference signal comprises at least one of a signal including the SMTC-related information, the WUS, or the SSB transmitted by the second cell.

5. In paragraph 1, Obtaining PRACH (physical random access channel) resource-related information for transmitting a random access preamble from the second cell to the first cell, and A method for determining timing for transmission of the random access preamble based on the PRACH resource related information and the reception time of the SSB from the first cell.

6. A method performed by a first cell in a wireless communication system, A step of providing WUS (wake-up signal) related information of the first cell and SMTC (SSB measurement timing configuration) related information of the first cell to the second cell; A step of receiving a WUS from a terminal (user equipment, UE) based on the above WUS-related information; A step of performing wake-up based on the above WUS; and A method comprising a step of transmitting a synchronization signal (SS) / physical broadcast channel (PBCH) block based on the above SMTC-related information.

7. In paragraph 6, The above SMTC related information includes SMTC information of the first cell, and A method wherein the SMTC information includes at least one of a periodicity, an offset, or a duration of a window during which the terminal monitors the SSB transmitted by the first cell.

8. In paragraph 6, The first cell and the second cell are assigned to the same frequency band, The above SMTC related information includes SMTC information for data cells in frequency bands adjacent to the above frequency band, and The above SMTC related information is set on a cell basis.

9. In paragraph 6, The above SMTC related information includes information related to the relative time for monitoring timing of the SSB transmitted by the first cell, The information related to the above relative time includes information about a reference signal and offset information from the reference signal, and A method in which the above-mentioned reference signal comprises at least one of a signal including the SMTC-related information, the WUS, or the SSB transmitted by the second cell.

10. In paragraph 6, Further comprising a step of receiving a random access preamble from the terminal that has received the SSB, A method in which the transmission timing of the random access preamble is determined based on information related to physical random access channel (PRACH) resources for transmitting the random access preamble to the first cell obtained from the second cell and the reception time of the SSB from the first cell.

11. In a wireless communication system, in a terminal (user equipment, UE), Transmitter and receiver; and Including a control unit, The above control unit, Obtain information related to the WUS (wake-up signal) and SMTC (SSB measurement timing configuration) of the first cell from the second cell, Transmitting WUS to the first cell based on the above WUS related information, Based on the above SMTC-related information, the monitoring timing of the SSB (synchronization signal (SS) / physical broadcast channel (PBCH) block) from the first cell is determined, and A terminal configured to monitor the SSB from the first cell based on the timing.

12. In paragraph 11, The above SMTC related information includes SMTC information of the first cell, and The terminal wherein the SMTC information includes at least one of a periodicity, an offset, or a duration of a window for monitoring the SSB transmitted by the first cell.

13. In paragraph 11, The first cell and the second cell are assigned to the same frequency band, The above SMTC related information includes SMTC information for data cells in frequency bands adjacent to the above frequency band, and The above SMTC related information is set based on the cell terminal.

14. In paragraph 11, The above SMTC related information includes information related to the relative time for monitoring timing of the SSB transmitted by the first cell, The information related to the above relative time includes information about a reference signal and offset information from the reference signal, and The above-mentioned reference signal is a terminal including at least one of a signal including the SMTC-related information, the WUS, or the SSB transmitted by the second cell.

15. In paragraph 11, Obtaining PRACH (physical random access channel) resource-related information for transmitting a random access preamble from the second cell to the first cell, and A terminal that determines timing for transmission of the random access preamble based on the PRACH resource related information and the time of reception of the SSB from the first cell.

16. In a first cell in a wireless communication system, Transmitter and receiver; and Including a control unit, The above control unit, Provides information related to the WUS (wake-up signal) of the first cell and information related to the SMTC (SSB measurement timing configuration) of the first cell to the second cell, Receive WUS from a terminal (user equipment, UE) based on the above WUS-related information, Perform wake-up based on the above WUS, and A first cell configured to transmit a synchronization signal (SS) / physical broadcast channel (PBCH) block based on the above SMTC-related information.

17. In paragraph 16, The above SMTC related information includes SMTC information of the first cell, and The SMTC information is a first cell including at least one of a periodicity, an offset, or a duration of a window during which the terminal monitors the SSB transmitted by the first cell.

18. In paragraph 16, The first cell and the second cell are assigned to the same frequency band, The above SMTC related information includes SMTC information for data cells in frequency bands adjacent to the above frequency band, and The above SMTC related information is set based on the first cell.

19. In Article 16, The above SMTC related information includes information related to the relative time for monitoring timing of the SSB transmitted by the first cell, The information related to the above relative time includes information about a reference signal and offset information from the reference signal, and The above reference signal is a first cell including at least one of a signal including the SMTC related information, the WUS or the SSB transmitted by the second cell.

20. In paragraph 16, The above control unit is further configured to receive a random access preamble from the terminal that has received the SSB, The transmission timing of the random access preamble is determined based on the PRACH (physical random access channel) resource related information for transmitting the random access preamble to the first cell obtained from the second cell and the reception time of the SSB from the first cell.

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