Method and device for energy-saving in communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method performed by a base station in a communication system according to an embodiment of the present disclosure may comprise the steps of: transmitting information related to one or more second cells via a first cell; receiving at least one uplink (UL) wake-up signal (WUS) via the one or more second cells; determining the activation of at least one second cell among the one or more second cells; and performing communication via the at least one activated second cell.

Description

Method and device for energy saving in communication systems

[0001] The present disclosure relates generally to wireless communication systems, and more particularly to methods and devices for energy saving in wireless communication systems.

[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] With the recent development of 5G / 6G communication systems that take the environment into consideration, the need for methods to reduce energy consumption of communication systems (e.g., terminals, base stations, networks, etc.) or methods for energy saving is emerging.

[0009] The present disclosure relates to a communication technique and system that integrates a 5G or 6G communication system, which supports higher data rates than 4G systems, with IoT technology. The present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart or connected cars, healthcare, digital education, retail, security, and safety-related services) based on 5G communication technology and IoT-related technologies. The present disclosure also discloses a method for saving energy in a base station.

[0010] Various embodiments of the present disclosure provide a new cell definition for reducing energy consumption of a base station in a wireless communication system.

[0011] Various embodiments of the present disclosure provide a structure of a base station having a wake-up receiver (WUR) for receiving a wake-up signal (WUS) transmitted by a terminal for on-demand cell activation.

[0012] Various embodiments of the present disclosure provide circuit configurations and functions of a base station including a WUR.

[0013] 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 can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure pertains from the description below.

[0014] According to one embodiment of the present disclosure, a method performed by a base station in a communication system may be provided.

[0015] According to one embodiment of the present disclosure, the method may include a step of activating a cell for access and / or synchronization (e.g., an Access / Sync cell) and deactivating an on-demand cell for traffic (and / or packet) processing (e.g., a Data cell), a step of setting WUS (wake up signal) configuration information for activating the on-demand cell through upper layer signaling and / or L1 (layer-1) signaling to terminals that performed initial access (or RACH procedure) through the Access / Sync cell, and a step of activating the on-demand cell from the terminal based on the configuration information.

[0016] According to one embodiment of the present disclosure, a method performed by a terminal in a communication system may be provided.

[0017] According to one embodiment of the present disclosure, the method may include the steps of performing initial access (or RACH (random access channel) procedure / random access) to an Access / Sync cell, receiving configuration information of an on-demand cell for processing traffic (and / or packet) from a base station through upper layer signaling and / or L1 signaling, determining transmission power of a WUS for activating the on-demand cell based on the received configuration information, and transmitting the WUS with the determined transmission power of the WUS.

[0018] A method performed by a base station in a communication system according to one embodiment of the present disclosure may include the steps of: transmitting information related to one or more second cells through a first cell; receiving one or more UL (uplink) WUS (wake up signal) through the one or more second cells; determining activation of at least one second cell among the one or more second cells; and performing communication through the at least one activated second cell.

[0019] According to one embodiment of the present disclosure, activation of the at least one second cell can be performed by a radio unit (RU) of the base station and a distributed unit (DU) of the base station based on information shared between the RU and the DU of the base station.

[0020] According to one embodiment of the present disclosure, the shared information may include information about measurement results for the one or more UL WUSs transmitted from the RU of the base station to the DU of the base station.

[0021] According to one embodiment of the present disclosure, the shared information may include information about a threshold associated with a measurement result for the one or more UL WUS.

[0022] According to one embodiment of the present disclosure, the transmission of information about the measurement results for the one or more UL WUSs from the RU of the base station to the DU of the base station may be based on information about a threshold associated with the measurement results for the one or more UL WUSs.

[0023] According to one embodiment of the present disclosure, the information about the measurement result for the one or more UL WUS may be information about the reference signal received power (RSRP), signal to interference noise ratio (SINR), or reference signal received quality (RSRQ) for the one or more UL WUS measured by the RU of the base station.

[0024] According to one embodiment of the present disclosure, the shared information may further include one or more of one or more WUS IDs (identifiers) corresponding to the one or more UL WUSs or synchronization information between an RU of the base station and a DU of the base station.

[0025] According to one embodiment of the present disclosure, initial access may be performed through the first cell, and the one or more second cells may be configured for data communication.

[0026] According to one embodiment of the present disclosure, the one or more UL WUSs can be received using a wake up receiver (WUR) included in an RU of the base station.

[0027] According to one embodiment of the present disclosure, the WUR may share some of the plurality of components included in the MR (main radio) of the base station.

[0028] According to one embodiment of the present disclosure, the element shared between the MR and the WUR includes a low noise amplifier (LNA), and the LNA can be connected to a switch for switching between the MR and the WUR.

[0029] A base station of a communication system according to one embodiment of the present disclosure includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: transmit information related to one or more second cells via a first cell; receive one or more UL (uplink) WUS (wake up signal) via the one or more second cells; determine activation for at least one second cell among the one or more second cells; and perform communication via the at least one activated second cell.

[0030] According to one embodiment of the present disclosure, activation of the at least one second cell can be performed by a radio unit (RU) of the base station and a distributed unit (DU) of the base station based on information shared between the RU and the DU of the base station.

[0031] According to one embodiment of the present disclosure, the shared information may include information about measurement results for the one or more UL WUSs transmitted from the RU of the base station to the DU of the base station.

[0032] According to one embodiment of the present disclosure, the shared information may include information about a threshold associated with a measurement result for the one or more UL WUS.

[0033] According to one embodiment of the present disclosure, the transmission of information about the measurement results for the one or more UL WUSs from the RU of the base station to the DU of the base station may be based on information about a threshold associated with the measurement results for the one or more UL WUSs.

[0034] According to one embodiment of the present disclosure, the information about the measurement result for the one or more UL WUS may be information about the reference signal received power (RSRP), signal to interference noise ratio (SINR), or reference signal received quality (RSRQ) for the one or more UL WUS measured by the RU of the base station.

[0035] According to one embodiment of the present disclosure, the shared information may further include one or more of one or more WUS IDs (identifiers) corresponding to the one or more UL WUSs or synchronization information between an RU of the base station and a DU of the base station.

[0036] According to one embodiment of the present disclosure, initial access may be performed through the first cell, and the one or more second cells may be configured for data communication.

[0037] According to one embodiment of the present disclosure, the one or more UL WUSs can be received using a wake up receiver (WUR) included in an RU of the base station.

[0038] According to one embodiment of the present disclosure, the WUR may share some of the plurality of components included in the MR (main radio) of the base station.

[0039] According to one embodiment of the present disclosure, the element shared between the MR and the WUR includes a low noise amplifier (LNA), and the LNA can be connected to a switch for switching between the MR and the WUR.

[0040] A method performed by a terminal in a communication system according to one embodiment of the present disclosure may include the steps of: receiving information related to one or more second cells from a base station through a first cell; transmitting one or more UL (uplink) WUS (wake up signal) to the base station through the one or more second cells; and performing communication with the base station through at least one activated second cell among the one or more second cells.

[0041] According to one embodiment of the present disclosure, the activated at least one second cell may be based on information shared between a radio unit (RU) of the base station and a distributed unit (DU) of the base station.

[0042] According to one embodiment of the present disclosure, the shared information may include information about measurement results for the one or more UL WUSs transmitted from the RU of the base station to the DU of the base station.

[0043] According to one embodiment of the present disclosure, initial access may be performed through the first cell, and the one or more second cells may be configured for data communication.

[0044] A terminal of a communication system according to one embodiment of the present disclosure includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive information related to one or more second cells from a base station through a first cell; transmit one or more UL (uplink) WUS (wake up signal) to the base station through the one or more second cells; and communicate with the base station through at least one activated second cell among the one or more second cells.

[0045] According to one embodiment of the present disclosure, the activated at least one second cell may be based on information shared between a radio unit (RU) of the base station and a distributed unit (DU) of the base station.

[0046] According to one embodiment of the present disclosure, the shared information may include information about measurement results for the one or more UL WUSs transmitted from the RU of the base station to the DU of the base station.

[0047] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0048] According to one embodiment of the present disclosure, energy consumption of a base station can be reduced.

[0049] According to one embodiment of the present disclosure, a definition of cells having different functions for energy saving of a base station in a mobile communication system and a structure of a base station capable of receiving a WUS for activating an on-demand cell can be provided.

[0050] According to one embodiment of the present disclosure, a base station having a WUR can share some of the receiver components of an existing NR main radio (MR). Therefore, the base station can be designed more efficiently in size and its cost can be reduced.

[0051] According to one embodiment of the present disclosure, the overhead required for a base station to periodically activate cells for common channel and / or signal transmission can be reduced. Accordingly, the energy of the base station can be managed more efficiently, and energy of the base station can be saved.

[0052] According to one embodiment of the present disclosure, a base station can efficiently control the number of on-demand cells for activation. Accordingly, the base station can maintain an inactivity state for a greater number of non-on-demand cells for a longer period of time, thereby saving energy.

[0053] 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 can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0054] FIG. 1 is a diagram illustrating the basic structure of a time-frequency domain, which is a wireless resource domain, in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0055] FIG. 2 is a diagram illustrating a slot structure considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0056] FIG. 3 is a diagram showing an example of a time domain mapping structure and beam sweeping operation of a synchronization signal in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0057] FIG. 4 is a diagram illustrating a synchronization signal block considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0058] FIG. 5 is a diagram illustrating various transmission cases of a synchronization signal block in a frequency band below 6 GHz considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0059] FIG. 6 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0060] FIG. 7 is a diagram illustrating transmission cases of a synchronization signal block according to a subcarrier interval within 5 ms in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0061] FIG. 8 is a diagram illustrating DMRS patterns (type 1 and type 2) used for communication between a base station and a terminal in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0062] FIG. 9 is a diagram illustrating an example of channel estimation using DMRS received on one PUSCH in a time band of a wireless communication system to which one embodiment of the present disclosure is applicable.

[0063] FIG. 10 is a diagram illustrating a method for re-establishing SSB transmission through dynamic signaling in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0064] FIG. 11 is a diagram illustrating a method for resetting BWP and BW through dynamic signaling of a wireless communication system to which one embodiment of the present disclosure is applicable.

[0065] FIG. 12 is a diagram illustrating a method for re-establishing DRX through dynamic signaling of a wireless communication system to which one embodiment of the present disclosure is applicable.

[0066] FIG. 13 is a diagram illustrating a DTx method for base station energy saving to which one embodiment of the present disclosure is applicable.

[0067] FIG. 14 is a diagram for explaining the operation of a base station according to a gNB wake-up signal according to one embodiment of the present disclosure.

[0068] FIG. 15 is a diagram illustrating an antenna adaptation method of a base station for energy saving in a wireless communication system according to one embodiment of the present disclosure.

[0069] FIG. 16 is a diagram illustrating an example of a cell concept having different functions for energy saving in a wireless communication system according to one embodiment of the present disclosure.

[0070] FIG. 17 is a diagram illustrating an example of an on-demand cell selection method of a wireless communication system according to one embodiment of the present disclosure.

[0071] FIG. 18a is a diagram illustrating an example of a procedure for on-demand cell selection in a wireless communication system according to one embodiment of the present disclosure.

[0072] FIG. 18b is a diagram illustrating an example of a procedure for on-demand cell selection in a wireless communication system according to one embodiment of the present disclosure.

[0073] FIG. 19 is a diagram illustrating a new structure of a wireless communication system according to one embodiment of the present disclosure.

[0074] FIG. 20 is a diagram illustrating a new structure of a wireless communication system according to one embodiment of the present disclosure.

[0075] FIG. 21 is a diagram illustrating a new structure of a wireless communication system according to one embodiment of the present disclosure.

[0076] FIG. 22 is a diagram illustrating a new digital front end structure of a wireless communication system according to one embodiment of the present disclosure.

[0077] FIG. 23 is a diagram illustrating a new structure of a wireless communication system according to one embodiment of the present disclosure.

[0078] FIG. 24 is a flowchart showing an example of an operation of a terminal applying a cell selection / activation method in a wireless communication system according to one embodiment of the present disclosure.

[0079] FIG. 25 is a flowchart illustrating an example of the operation of a base station applying a cell selection / activation method in a wireless communication system according to one embodiment of the present disclosure.

[0080] FIG. 26 is a block diagram of a terminal according to one embodiment of the present disclosure.

[0081] FIG. 27 is a block diagram of a base station according to one embodiment of the present disclosure.

[0082] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. In describing the embodiments of the present disclosure below, descriptions of technical details that are well-known in the technical field of the present disclosure and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0083] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0084] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments described below and may be implemented in various different forms. These embodiments are provided only to make the present disclosure complete and to fully inform those skilled in the art of the present disclosure of the scope of the technical idea, and the present disclosure is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, a detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, their definitions should be made based on the contents throughout the specification.

[0085] 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 a similar technical background or channel type. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0086] At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flow diagram block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flow diagram block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0087] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0088] The term '~ unit' used in this disclosure means a software or hardware component such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), and the '~ unit' performs 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 play 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'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0089] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The methods and devices proposed in the embodiments of the present disclosure are not limited to each embodiment, and may be utilized as a combination of one or more embodiments proposed in the disclosure, all or part of the embodiments. Accordingly, the embodiments of the present disclosure may be applied with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as determined by a person skilled in the art.

[0090] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0091] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as 3GPP's HSPA (high speed packet access), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE's 802.17e communication standards.

[0092] In the LTE system, which is a representative example of a broadband wireless communication system, the downlink (DL) adopts the orthogonal frequency division multiplexing (OFDM) method, and the uplink (UL) adopts the single carrier frequency division multiple access (SC-FDMA) method. The uplink refers to a wireless link in which a terminal (hereinafter referred to as user equipment (UE)) (or mobile station (MS)) transmits data or control signals to a base station (eNode B (eNB) or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal (UE). In addition, the aforementioned multiple access method typically allocates and operates time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality, thereby distinguishing the data or control information of each user.

[0093] 5G communication systems, the successor to LTE, must support services that simultaneously satisfy diverse requirements, allowing them to freely reflect the diverse needs of users and service providers. Services being considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low-latency communication (URLLC).

[0094] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must provide not only the peak data rate but also the increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, may be required. Furthermore, while LTE systems transmit signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3 to 6 GHz or higher frequency bands.

[0095] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the Internet of Things, mMTC requires supporting a large number of terminals within a cell, improving terminal coverage, extending battery life, and reducing terminal costs. The Internet of Things provides communication functions by attaching various sensors and various devices, so a large number of terminals (e.g., 1,000,000 terminals / km) are required within a cell. 2) must be able to support. Furthermore, terminals supporting mMTC are likely to be located in shadow areas not covered by cells, such as basements of buildings, due to the nature of the service, requiring wider coverage than other services provided by 5G communication systems. Terminals supporting mMTC must be composed of low-cost terminals, and since it is difficult to frequently replace the terminal's battery, they require a very long battery life time, such as 10 to 16 years.

[0096] Finally, URLLC refers to a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services can be considered for remote control of robots or machinery, industrial automation, unmanaged aerial vehicles, remote health care, or emergency alerts. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and, at the same time, must have a 10 -5 The following packet error rate requirements must be met. Therefore, for services supporting URLLC, 5G systems must provide a smaller transmit time interval (TTI) than other services, while simultaneously allocating extensive resources in the frequency band to ensure communication link reliability.

[0097] The three services of the 5G communication system (hereinafter, "interoperable with 5G systems")—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the different requirements of each service, different transmission and reception techniques and parameters can be used across the services.

[0098] The frame structure of the 5G system will be described in more detail below with reference to the drawings. For convenience of explanation, the wireless communication system to which the present disclosure applies will be described below using the configuration of a 5G system as an example. However, the embodiments of the present disclosure can be applied in the same or similar manner to systems beyond 5G or other communication systems to which the present disclosure applies.

[0099] FIG. 1 is a diagram illustrating the basic structure of a time-frequency domain, which is a wireless resource domain, in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0100] In Fig. 1, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE, 101), which can be defined as one OFDM (Orthogonal Frequency Division Multiplexing) symbol (or DFT-s-OFDM (discrete Fourier transform spread OFDM) symbol) (102) in the time axis and one subcarrier (subcarrier, 103) in the frequency axis. Indicates the number of subcarriers per resource block (RB) in the frequency domain. (For example, 12) consecutive REs can form one resource block (RB, 104). In addition, the number of symbols per subframe according to the setting value μ for the subcarrier spacing in the time domain is indicated. A number of consecutive OFDM symbols can constitute one subframe (subframe, 110).

[0101] FIG. 2 is a diagram illustrating a slot structure considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0102] FIG. 2 illustrates an example of a slot structure including a frame (200), a subframe (201), and a slot (202 or 203). One frame (200) can be defined as 10 ms. One subframe (201) can be defined as 1 ms, and thus one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( ))=14). One subframe (201) may be composed of one or more slots (202 or 203), and the number of slots (202 or 203) per one subframe (201) may vary depending on μ (204 or 205), which is a setting value for the subcarrier space (SCS).

[0103] The slot structure is illustrated when μ=0 (204) and μ=1 (205) as the subcarrier spacing setting value. When μ=0 (204), one subframe (201) can be composed of one slot (202), and when μ=1 (205), one subframe (201) can be composed of two slots (including slot (203) for example). That is, depending on the setting value μ for the subcarrier spacing, the number of slots per subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. For example, depending on the subcarrier spacing setting μ and can be defined as in below.

[0104] [Table 1]

[0105]

[0106] In a 5G wireless communication system, a synchronization signal block (SSB, which may be used interchangeably with an SS block or an SS / PBCH block) may be transmitted for initial connection of a terminal, and the synchronization signal block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0107] In the initial access phase when a terminal connects to the system, the terminal can first obtain downlink time and frequency domain synchronization from a synchronization signal through cell search and obtain a cell ID. The synchronization signal may include PSS and SSS. In addition, the terminal can obtain transmission-related system information and basic parameter values, such as system bandwidth or related control information, by receiving a PBCH that transmits a master information block (MIB) from a base station. Based on this information, the terminal can perform decoding on the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) to obtain a system information block (SIB). Thereafter, the terminal can exchange identification-related information between the base station and the terminal through a random access phase and go through registration and authentication steps to initially access the network. Additionally, the terminal can obtain cell-common transmission and reception-related control information by receiving system information (System Information Block, SIB) transmitted by the base station. The cell-common transmission and reception-related control information may include random access-related control information, paging-related control information, and common control information for various physical channels.

[0108] A synchronization signal is a signal that serves as a reference for cell search, and subcarrier spacing can be applied to suit channel environments such as phase noise for each frequency band. In the case of a data channel or control channel, as described above, different subcarrier spacings can be applied depending on the service type in order to support various services.

[0109] FIG. 3 is a diagram showing an example of a time domain mapping structure and beam sweeping operation of a synchronization signal in a wireless communication system to which one embodiment of the disclosure is applicable.

[0110] For the purpose of explanation, the following components can be defined:

[0111] - PSS (Primary Synchronization Signal): This signal serves as the basis for DL ​​time / frequency synchronization and provides some cell ID information.

[0112] - SSS (Secondary Synchronization Signal): Serves as a reference for DL ​​time / frequency synchronization and provides some remaining information, including the cell ID. Additionally, it can serve as a reference signal for PBCH demodulation.

[0113] - PBCH (Physical Broadcast Channel): Provides MIB (Master Information Block), which is essential system information required for transmission and reception of data channels and control channels of the terminal. The essential system information may include search space-related control information indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel that transmits system information, and SFN (System Frame Number), which is a frame-unit index that serves as a timing reference.

[0114] - SS / PBCH Block (Synchronization Signal / PBCH Block or SSB): An SS / PBCH block consists of N OFDM symbols and is a combination of PSS, SSS, PBCH, etc. In a system where beam sweeping technology is applied, the SS / PBCH block is the minimum unit to which beam sweeping is applied. In a 5G system, N can be 4. The base station can transmit up to L SS / PBCH blocks, and the L SS / PBCH blocks are mapped within a half frame (0.5 ms). In addition, the L SS / PBCH blocks are periodically repeated in units of a predetermined period P. The period P can be notified to the terminal by the base station through signaling. If there is no separate signaling for the period P, the terminal applies a pre-agreed default value.

[0115] Referring to FIG. 3, FIG. 3 illustrates an example in which beam sweeping is applied to SS / PBCH block units over time. In the example of FIG. 3, terminal 1 (305) receives an SS / PBCH block using a beam radiated in the direction of #d0 (303) by beamforming applied to SS / PBCH block #0 at time t1 (301). Terminal 2 (306) receives an SS / PBCH block using a beam radiated in the direction of #d4 (304) by beamforming applied to SS / PBCH block #4 at time t2 (302). The terminal can obtain an optimal synchronization signal through a beam radiated from the base station in the direction where the terminal is located. For example, terminal 1 (305) may have difficulty in obtaining time / frequency synchronization and essential system information from an SS / PBCH block through a beam radiated in the direction of #d4, which is far from the location of terminal 1.

[0116] In addition to the initial connection procedure described above, the terminal may also receive SS / PBCH blocks to determine whether the radio link quality of the current cell is maintained at a certain level or higher. Furthermore, during a handover procedure in which the terminal moves from the current cell to a neighboring cell, the terminal may receive SS / PBCH blocks from the neighboring cell to determine the radio link quality of the neighboring cell and obtain time / frequency synchronization with the neighboring cell.

[0117] Below, the cell initial access operation procedure of a 5G wireless communication system will be described in more detail with reference to drawings.

[0118] Synchronization signals serve as a reference for cell search and can be transmitted with subcarrier spacing appropriate for the channel environment (e.g., phase noise) for each frequency band. 5G base stations can transmit multiple synchronization signal blocks depending on the number of analog beams they intend to operate. For example, PSS and SSS can be mapped and transmitted across 12 RBs, and PBCH can be mapped and transmitted across 24 RBs. The following describes the structure by which synchronization signals and PBCHs are transmitted in a 5G communication system.

[0119] FIG. 4 is a diagram illustrating a synchronization signal block considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0120] According to FIG. 4, the synchronization signal block (SS block) (400) may include a PSS (401), an SSS (403), and a PBCH (Broadcast Channel) (402).

[0121] The synchronization signal block (400) can be mapped to four OFDM symbols (404) on the time axis. The PSS (401) and the SSS (403) can be transmitted in 12 RBs (405) on the frequency axis and in the first and third OFDM symbols on the time axis, respectively. In a 5G system, for example, a total of 1008 different cell IDs can be defined. Depending on the physical cell ID (PCI) of the cell, the PSS (401) can have three different values, and the SSS (403) can have 336 different values. The terminal can obtain one of (336 X 3 =) 1008 cell IDs by detecting the PSS (401) and the SSS (403) and combining them. This can be expressed by the following <Mathematical Formula 1>.

[0122] [Mathematical Formula 1]

[0123]

[0124] Here can be estimated from SSS(403) and can have a value between 0 and 335. can be estimated from PSS (401) and can have a value between 0 and 2. The terminal class Cell ID is a combination of The value can be estimated.

[0125] PBCH (402) can be transmitted in resources including 6 RBs (407, 408) on both sides, excluding 12 RBs (405) in the middle, while SSS (403) is transmitted in 24 RBs (406) in the frequency axis and in the 2nd to 4th OFDM symbols of the SS block in the time axis. PBCH (402) can include PBCH payload and PBCH DMRS (demodulation reference signal), and various system information called MIB can be transmitted in the PBCH payload. For example, MIB can include information as shown in below.

[0126] [Table 2]

[0127]

[0128] - Synchronization signal block information: The frequency domain offset of the synchronization signal block can be indicated through the 4-bit ssb-SubcarrierOffset in the MIB. The index of the synchronization signal block including the PBCH can be indirectly obtained through decoding the PBCH DMRS and the PBCH. In one embodiment, in a frequency band below 6 GHz, 3 bits obtained through decoding the PBCH DMRS indicate the synchronization signal block index, and in a frequency band above 6 GHz, a total of 6 bits, including 3 bits obtained through decoding the PBCH DMRS and 3 bits obtained through decoding the PBCH included in the PBCH payload, can indicate the synchronization signal block index including the PBCH.

[0129] - PDCCH (physical downlink control channel) configuration information: The subcarrier spacing of the common downlink control channel can be indicated through 1 bit (subCarrierSpacingCommon) in the MIB, and the time-frequency resource configuration information of the CORESET (control resource set) and search space (SS) can be indicated through 8 bits (pdcch-ConfigSIB1).

[0130] - SFN (system frame number): 6 bits (systemFrameNumber) within the MIB can be used to indicate a portion of the SFN. The 4 least significant bits (LSBs) of the SFN are included in the PBCH payload, so the terminal can indirectly obtain them through PBCH decoding.

[0131] - Timing information within a radio frame: The terminal can indirectly determine whether the synchronization signal block was transmitted in the first or second half frame of the radio frame by using the synchronization signal block index described above and 1 bit (half frame) obtained through PBCH decoding included in the PBCH payload.

[0132] Since the transmission bandwidths (12 RB (405)) of PSS (401) and SSS (403) and the transmission bandwidth (24 RB (406)) of PBCH (402) are different from each other, in the first OFDM symbol in which PSS (401) is transmitted within the transmission bandwidth of PBCH (402), 6 RBs (407, 408) on both sides exist except for the 12 RBs in the middle in which PSS (401) is transmitted, and the above areas can be used to transmit other signals or can be empty.

[0133] Synchronization signal blocks can be transmitted using the same analog beam. For example, PSS (401), SSS (403), and PBCH (402) can all be transmitted using the same beam. Since analog beams have the characteristic that they cannot be applied differently in the frequency axis, the same analog beam can be applied to all frequency axis RBs within a specific OFDM symbol to which a specific analog beam is applied. For example, all four OFDM symbols in which PSS (401), SSS (403), and PBCH (402) are transmitted can be transmitted using the same analog beam.

[0134] FIG. 5 is a diagram illustrating various transmission cases of a synchronization signal block in a frequency band below 6 GHz considered in a communication system to which one embodiment of the present disclosure is applicable.

[0135] Referring to FIG. 5, in a 5G communication system, a 15 kHz subcarrier spacing (SCS) (520) and a 30 kHz subcarrier spacing (SCS) (530, 440) may be used for transmission of a synchronization signal block in a frequency band below 6 GHz (or, FR1 (frequency range 1), e.g., 410 MHz-7125 MHz). In the 15 kHz subcarrier spacing (520), there may be one transmission case (e.g., case #1 (501)) for the synchronization signal block, and in the 30 kHz subcarrier spacing (530, 540), there may be two transmission cases (e.g., case #2 (402) and case #3 (503)) for the synchronization signal block.

[0136] In case #1 (501) at the subcarrier spacing of 15 kHz (520) in FIG. 5, a maximum of two synchronization signal blocks can be transmitted within 1 ms (504) (or equivalent to 1 slot length when 1 slot consists of 14 OFDM symbols). In the example of FIG. 4, synchronization signal block #0 (507) and synchronization signal block #1 (508) are illustrated. For example, synchronization signal block #0 (507) can be mapped to 4 consecutive symbols from the 3rd OFDM symbol, and synchronization signal block #1 (508) can be mapped to 4 consecutive symbols from the 9th OFDM symbol.

[0137] Different analog beams may be applied to the synchronization signal block #0 (507) and synchronization signal block #1 (508). The same beam may be applied to all 3rd to 6th OFDM symbols to which synchronization signal block #0 (507) is mapped, and the same beam may be applied to all 9th ​​to 12th OFDM symbols to which synchronization signal block #1 (508) is mapped. In the 7th, 8th, 13th, and 14th OFDM symbols to which synchronization signal blocks are not mapped, the analog beam may be freely determined at the discretion of the base station as to which beam to use.

[0138] In case #2 (502) at subcarrier spacing of 30 kHz (530) in FIG. 5, a maximum of two synchronization signal blocks can be transmitted within 0.5 ms (505) (or 1 slot length when 1 slot consists of 14 OFDM symbols), and accordingly, a maximum of four synchronization signal blocks can be transmitted within 1 ms (or 2 slot lengths when 1 slot consists of 14 OFDM symbols). In one example of FIG. 4, a case is illustrated where synchronization signal block #0 (509), synchronization signal block #1 (510), synchronization signal block #2 (511), and synchronization signal block #3 (512) are transmitted within 1 ms (i.e., two slots) of time. Synchronization signal block #0 (509) and synchronization signal block #1 (510) can be mapped from the 5th OFDM symbol and the 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (511) and synchronization signal block #3 (512) can be mapped from the 3rd OFDM symbol and the 7th OFDM symbol of the second slot, respectively.

[0139] Different analog beams may be applied to the synchronization signal block #0 (509), synchronization signal block #1 (510), synchronization signal block #2 (511), and synchronization signal block #3 (512), respectively. In addition, the same analog beam may be applied to the 5th to 8th OFDM symbols of the first slot in which synchronization signal block #0 (509) is transmitted, the 9th to 12th OFDM symbols of the first slot in which synchronization signal block #1 (510) is transmitted, the 3rd to 6th symbols of the second slot in which synchronization signal block #2 (511) is transmitted, and the 7th to 10th symbols of the second slot in which synchronization signal block #3 (512) is transmitted. In OFDM symbols in which synchronization signal blocks are not mapped, the analog beam may be freely determined at the discretion of the base station as to which beam to use.

[0140] In case #3 (503) at subcarrier spacing of 30 kHz (540) in FIG. 5, a maximum of two synchronization signal blocks can be transmitted within 0.5 ms (506) (or 1 slot length when 1 slot consists of 14 OFDM symbols), and accordingly, a maximum of four synchronization signal blocks can be transmitted within 1 ms (or 2 slot lengths when 1 slot consists of 14 OFDM symbols). In one example of FIG. 4, synchronization signal block #0 (513), synchronization signal block #1 (514), synchronization signal block #2 (515), and synchronization signal block #3 (516) are illustrated as being transmitted within 1 ms (i.e., two slots) of time. Synchronization signal block #0 (513) and synchronization signal block #1 (514) can be mapped from the 3rd OFDM symbol and the 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (515) and synchronization signal block #3 (516) can be mapped from the 3rd OFDM symbol and the 9th OFDM symbol of the second slot, respectively.

[0141] Different analog beams may be used for the above synchronization signal block #0 (513), synchronization signal block #1 (514), synchronization signal block #2 (515), and synchronization signal block #3 (516), respectively. As described in the examples above, the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and which beam to use in OFDM symbols to which the synchronization signal block is not mapped may be freely determined at the discretion of the base station.

[0142] FIG. 6 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0143] In the 5G communication system, in the frequency band above 6 GHz (or, FR2, e.g., 24250 MHz-52600 MHz), a subcarrier spacing of 120 kHz (630) as in the example of Case #4 (610) and a subcarrier spacing of 240 kHz (640) as in the example of Case #5 (620) may be used for transmission of synchronization signal blocks.

[0144] In case #4 (610) with a subcarrier spacing of 120 kHz (630), up to four synchronization signal blocks can be transmitted within a time period of 0.25 ms (601) (or equivalent to two slot lengths when one slot consists of 14 OFDM symbols). In the example of Fig. 6, synchronization signal block #0 (603), synchronization signal block #1 (604), synchronization signal block #2 (605), and synchronization signal block #3 (606) are illustrated as being transmitted within 0.25 ms (i.e., two slots). Synchronization signal block #0 (603) and synchronization signal block #1 (604) can be mapped to 4 consecutive symbols starting from the 5th OFDM symbol of the first slot, and to 4 consecutive symbols starting from the 9th OFDM symbol, respectively, and synchronization signal block #2 (605) and synchronization signal block #3 (606) can be mapped to 4 consecutive symbols starting from the 3rd OFDM symbol of the second slot, and to 4 consecutive symbols starting from the 7th OFDM symbol, respectively.

[0145] As described in the above embodiment, different analog beams may be used for synchronization signal block #0 (603), synchronization signal block #1 (604), synchronization signal block #2 (605), and synchronization signal block #3 (606), respectively. In addition, the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and in OFDM symbols to which the synchronization signal block is not mapped, the beam to be used may be freely determined at the discretion of the base station.

[0146] In case #5 (620) at subcarrier spacing of 240 kHz (640), up to 8 synchronization signal blocks can be transmitted within 0.25 ms (602) (or 4 slot length when 1 slot consists of 14 OFDM symbols). In the example of Fig. 6, synchronization signal block #0 (607), synchronization signal block #1 (608), synchronization signal block #2 (609), synchronization signal block #3 (610), synchronization signal block #4 (611), synchronization signal block #5 (612), synchronization signal block #6 (613), and synchronization signal block #7 (614) are illustrated as being transmitted within 0.25 ms (i.e. 4 slots).

[0147] Synchronization signal block #0 (607) and synchronization signal block #1 (608) can be mapped to 4 consecutive symbols from the 9th OFDM symbol of the first slot, and 4 consecutive symbols from the 13th OFDM symbol, respectively; synchronization signal block #2 (609) and synchronization signal block #3 (610) can be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the second slot, and 4 consecutive symbols from the 7th OFDM symbol, respectively; synchronization signal block #4 (611), synchronization signal block #5 (612), and synchronization signal block #6 (613) can be mapped to 4 consecutive symbols from the 5th OFDM symbol of the third slot, and 4 consecutive symbols from the 9th OFDM symbol, and 4 consecutive symbols from the 13th OFDM symbol, respectively; synchronization signal block #7 (614) can be mapped to 4 consecutive symbols from the 4th slot, and 4 consecutive symbols from the 9th OFDM symbol, respectively; It can be mapped to four consecutive symbols starting from the third OFDM symbol.

[0148] As described in the above embodiment, different analog beams may be used for synchronization signal block #0 (607), synchronization signal block #1 (608), synchronization signal block #2 (609), synchronization signal block #3 (610), synchronization signal block #4 (611), synchronization signal block #5 (612), synchronization signal block #6 (613), and synchronization signal block #7 (614), respectively. In addition, the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and in OFDM symbols to which the synchronization signal block is not mapped, which beam to be used may be freely determined at the discretion of the base station.

[0149] FIG. 7 is a diagram illustrating transmission cases of a synchronization signal block according to a subcarrier interval within 5 ms in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0150] Referring to FIG. 7, in a 5G communication system, a synchronization signal block may be periodically transmitted in units of, for example, a time interval (710) of 5 ms (corresponding to 5 subframes or half frames).

[0151] In the frequency band below 3 GHz, up to 4 synchronization signal blocks can be transmitted within a 5 ms (710) period. In the frequency band above 3 GHz and below 6 GHz, up to 8 synchronization signal blocks can be transmitted. In the frequency band above 6 GHz, up to 64 synchronization signal blocks can be transmitted. As described above, subcarrier spacings of 15 kHz and 30 kHz can be used in the frequency below 6 GHz.

[0152] In the example of FIG. 7, in case #1 (501) of FIG. 5, which consists of one slot and has a subcarrier spacing of 15 kHz, synchronization signal blocks can be mapped to the first and second slots in a frequency band of 3 GHz or less, so that up to 4 (721) can be transmitted, and in the frequency band of more than 3 GHz and less than 6 GHz, synchronization signal blocks can be mapped to the first, second, third, and fourth slots, so that up to 8 (721) can be transmitted. In case #2 (502) or case #3 (503) with a subcarrier spacing of 30 kHz and consisting of two slots of FIG. 5, synchronization signal blocks can be mapped starting from the first slot in a frequency band of 3 GHz or less, so that up to 4 (731, 741) can be transmitted, and in a frequency band exceeding 3 GHz and below 6 GHz, synchronization signal blocks can be mapped starting from the first and third slots, so that up to 8 (732, 742) can be transmitted.

[0153] Subcarrier spacings of 120 kHz and 240 kHz can be used in frequencies exceeding 6 GHz. In the example of Fig. 6, in case #4 (610) with subcarrier spacing of 120 kHz consisting of two slots of Fig. 6, synchronization signal blocks can be mapped starting from the 1st, 3rd, 5th, 7th, 11th, 13th, 15th, 17th, 21st, 22nd, 25th, 27th, 31st, 33rd, 35th, and 37th slots in the frequency band exceeding 6 GHz, so that up to 64 (751) can be transmitted. In the example of FIG. 7, in case #5 (620) of FIG. 6, which consists of 4 slots and has a subcarrier spacing of 240 kHz, synchronization signal blocks in a frequency band exceeding 6 GHz can be mapped starting from the 1st, 5th, 9th, 13th, 21st, 25th, 29th, and 33rd slots, so that up to 64 (761) can be transmitted.

[0154] The terminal can decode the PDCCH and PDSCH based on the system information included in the received MIB and then acquire the SIB. The SIB may include at least one of uplink cell bandwidth-related information, random access parameters, paging parameters, or parameters related to uplink power control.

[0155] Typically, a terminal can establish a wireless link with a network through a random access procedure based on synchronization with the network and system information acquired during the cell search process. Random access can be either contention-based or contention-free. When a terminal performs cell selection and reselection during the initial cell access phase, for example, contention-based random access can be used to transition from the RRC_IDLE state to the RRC_CONNECTED state. Contention-free random access can be used to reestablish uplink synchronization when downlink data arrives, in the case of a handover, or for positioning. Table 3 below illustrates the conditions (events) that trigger the random access procedure in a 5G system.

[0156] [Table 3]

[0157]

[0158] Below, a method for setting a measurement time for Radio Resource Management (RRM) based on a synchronization signal block (SS block or SSB) of a 5G wireless communication system is described.

[0159] The terminal receives MeasObjectNR from MeasObjectToAddModList via upper-layer signaling for SSB-based intra / inter-frequency measurements and CSI-RS-based intra / inter-frequency measurements. For example, MeasObjectNR can be configured as shown in Table 4 below.

[0160] [Table 4]

[0161]

[0162]

[0163] -ssbFrequency:You can set the frequency of the synchronization signal associated with MeasObjectNR.

[0164] -ssbSubcarrierSpacing: Sets the subcarrier spacing of SSB. FR1 can only be applied to 15 kHz or 30 kHz, and FR2 can only be applied to 120 kHz or 240 kHz.

[0165] -smtc1: Indicates SS / PBCH block measurement timing configuration, and can set the primary measurement timing configuration and the timing offset and duration for SSB.

[0166] -smtc2:pci-List allows you to set the secondary measurement timing configuration for SSBs associated with MeasObjectNRs with PCIs listed in pci-list.

[0167] In addition to this, SMTC can be configured to the UE through other higher layer signaling, for example, SIB2 for intra-frequency, inter-frequency and inter-RAT cell reselection, or reconfigurationWithSync for NR PSCell change and NR PCell change, and SCellConfig for NR SCell addition.

[0168] For SSB measurement, the terminal can set the first SS / PBCH block measurement timing configuration (SMTC) according to periodictiyAndOffset (providing Periodicity and Offset) through smtc1 set through upper layer signaling. In one embodiment, the first subframe of each SMTC occasion can start from the system frame number (SFN) and the subframe of SpCell that satisfy the conditions of Table 5 below.

[0169] [Table 5]

[0170]

[0171] If smtc2 is configured, the UE can configure additional SMTCs according to the configured smtc2 periodicity and the offset and duration of smtc1 for the cells indicated by the pci-List value of smtc2 in the same MeasObjectNR. In addition, the UE can configure smtc and measure SSB through smtc2-LP (with long periodicity) and smtc3list for IAB-MT (integrated access and backhaul - mobile termination) for the same frequency (e.g., frequency for intra-frequency cell reselection) or different frequencies (e.g., frequencies for inter-frequency cell reselection). In one embodiment, the UE may not consider SSB transmitted in subframes other than SMTC occasions for SSB-based RRM measurement at the configured ssbFrequency.

[0172] A base station can utilize various multi-TRP (transmit / receive point) operation methods depending on serving cell configuration and physical cell identifier (PCI) settings. Among these, when two physically separated TRPs have different PCIs, there are two possible methods for operating the two TRPs.

[0173] [Operation Method 1]

[0174] Two TRPs with different PCIs can be operated with two serving cell configurations.

[0175] The base station can configure channels and signals transmitted from different TRPs by including them in different serving cell configurations through [Operation Method 1]. That is, each TRP has an independent serving cell configuration, and the frequency band values ​​FrequencyInfoDLs indicated by DownlinkConfigCommon in each serving cell configuration can indicate at least some overlapping bands. Since the above multiple TRPs operate based on multiple ServCellIndexes (e.g., ServCellIndex #1 and ServCellIndex #2), it is possible for each TRP to use a separate PCI. That is, the base station can allocate one PCI per ServCellIndex.

[0176] In this case, if multiple SSBs are transmitted from TRP 1 and TRP 2, and the SSBs have different PCIs (e.g., PCI #1 and PCI #2), the base station can appropriately select the value of ServCellIndex indicated by the cell parameter in QCL-Info to map the PCI suitable for each TRP and designate the SSB transmitted from either TRP 1 or TRP 2 as the source reference RS of the QCL configuration information. However, this configuration applies one serving cell configuration that can be used for carrier aggregation (CA) of the terminal to multiple TRPs, which has the problem of limiting the degree of freedom of CA configuration or increasing the signaling burden.

[0177] [Operation Method 2]

[0178] Two TRPs with different PCIs can be operated with one serving cell configuration.

[0179] The base station can configure channels and signals transmitted in different TRPs through a single serving cell configuration using [Operation Method 2]. Since the terminal operates based on a single ServCellIndex (e.g., ServCellIndex #1), it is impossible for it to recognize the PCI (e.g., PCI #2) allocated to the second TRP. [Operation Method 1] may have greater freedom in CA configuration compared to the above-described [Operation Method 1], but if multiple SSBs are transmitted in TRP 1 and TRP 2, the SSBs may have different PCIs (e.g., PCI #1 and PCI #2), and the base station may not be able to map the PCI (e.g., PCI #2) of the second TRP through the ServCellIndex indicated by the cell parameter in the QCL-Info. The base station may only be able to designate the SSB transmitted in TRP 1 as the source reference RS of the QCL configuration information, but may not be able to designate the SSB transmitted in TRP 2.

[0180] As described above, [Operation Method 1] can perform multi-TRP operation for two TRPs with different PCIs through additional serving cell configuration without additional standard support, but [Operation Method 2] can operate based on the following additional terminal capability report and base station configuration information.

[0181] Terminal capability reporting for [Operation Method 2]

[0182] - A terminal can report to the base station via upper layer signaling that it can configure additional PCIs other than the PCI of the serving cell, through the terminal capability. The terminal capability may include two independent numbers, X1 and X2, or each X1 and X2 may be reported as an independent terminal capability.

[0183] - X1 means the maximum number of additional PCIs that can be set for the terminal, and the PCI may be different from the PCI of the serving cell. In this case, the time domain position and periodicity of the SSB corresponding to the additional PCI may be the same as the SSB of the serving cell.

[0184] - X2 means the maximum number of additional PCIs that can be set for the terminal, and the PCI at this time may be different from the PCI of the serving cell, and the time domain position and periodicity of the SSB corresponding to the additional PCI may be different from the SSB corresponding to the PCI reported as X1.

[0185] - By definition, the PCIs corresponding to the values ​​reported by X1 and X2 cannot be set simultaneously.

[0186] - The values ​​reported as X1 and X2 through the terminal capability report can each have an integer value from 0 to 7.

[0187] - The values ​​reported as X1 and X2 may have different values ​​reported in FR1 and FR2.

[0188] Regarding upper layer signaling settings for [Operation Method 2]

[0189] - The terminal may receive from the base station the upper layer signaling SSB-MTCAdditionalPCI-r17 based on the terminal capability report described above, and the upper layer signaling may include at least a plurality of additional PCIs having different values ​​from the serving cell, SSB transmission power corresponding to each additional PCI, and ssb-PositionInBurst corresponding to each additional PCI, and the maximum number of additional PCIs that can be set may be 7.

[0190] - The terminal can assume that the SSB corresponding to the additional PCI of a different value from the serving cell has the same center frequency, subcarrier spacing, and subframe number offset as the SSB of the serving cell.

[0191] - The terminal can assume that the reference RS (e.g., SSB or CSI-RS) corresponding to the PCI of the serving cell is always connected to the activated TCI state, and in case of an additionally configured PCI with a different value from the serving cell, when there is one or more PCIs, it can assume that only one PCI among those PCIs is connected to the activated TCI state.

[0192] - If a terminal is configured with two different coresetPoolIndexes, and a reference RS corresponding to a serving cell PCI is connected to one or more activated TCI states, and a reference RS corresponding to an additionally configured PCI having a different value from the serving cell is connected to one or more activated TCI states, the terminal can expect that the activated TCI state(s) connected to the serving cell PCI will be connected to one of the two coresetPoolIndexes, and the activated TCI state(s) connected to the additionally configured PCI having a different value from the serving cell will be connected to the remaining one coresetPoolIndex.

[0193] The terminal capability report and the upper layer signaling of the base station for the above-described [Operation Method 2] can set an additional PCI with a different value from the PCI of the serving cell. If the above setting does not exist, the SSB corresponding to the additional PCI with a different value from the PCI of the serving cell that cannot be designated as the source reference RS can be used for the purpose of designating the source reference RS of the QCL configuration information. In addition, unlike the SSB that can be set for purposes such as RRM, mobility, or handover, like the configuration information for the SSB that can be set in the upper layer signaling smtc1 and smtc2, it can be used to serve as a QCL source RS to support multiple TRP operations with different PCIs.

[0194] Next, we will specifically explain DMRS (demodulation reference signal), one of the reference signals in the 5G system.

[0195] A DMRS can be composed of multiple DMRS ports, and each port maintains orthogonality to avoid interference with each other by using code division multiplexing (CDM) or frequency division multiplexing (FDM). However, the term for DMRS can be expressed with different terms depending on the user's intention and the purpose of using the reference signal. The term DMRS is only provided as a specific example to easily explain the technical content of the present disclosure and to help understand the present disclosure, and is not intended to limit the scope of the present disclosure. In other words, it is obvious to a person skilled in the art to which the present disclosure pertains that the technical idea of ​​the present disclosure can be implemented for any reference signal.

[0196] FIG. 8 is a diagram illustrating DMRS patterns (type 1 and type 2) used for communication between a base station and a terminal in a wireless communication system to which one embodiment of the present disclosure is applicable. In a 5G system, two DMRS patterns may be supported. FIG. 8 illustrates the two DMRS patterns.

[0197] Referring to FIG. 8, reference numbers 801 and 802 correspond to DMRS type 1, where reference number 801 represents a 1 symbol pattern and reference number 802 represents a 2 symbol pattern. DMRS type 1 of reference numbers 801 and 802 is a DMRS pattern of a comb 2 structure, which can be composed of two CDM groups, and different CDM groups can be FDMed.

[0198] In the 1 symbol pattern (801), frequency-based CDM is applied to the same CDM group to distinguish two DMRS ports, and thus a total of four orthogonal DMRS ports can be configured. The 1 symbol pattern (801) may include a DMRS port ID mapped to each CDM group (the DMRS port ID for downlink may be indicated by the illustrated number + 1000). In the 2 symbol pattern (802), time / frequency-based CDM is applied to the same CDM group to distinguish four DMRS ports, and thus a total of eight orthogonal DMRS ports can be configured. The 2 symbol pattern (802) may include a DMRS port ID mapped to each CDM group (the DMRS port ID for downlink may be indicated by the illustrated number + 1000).

[0199] DMRS type 2, illustrated in reference numbers 803 and 804, is a DMRS pattern having a structure in which FD-OCC (frequency domain orthogonal cover codes) are applied to frequency-adjacent subcarriers, and can be composed of three CDM groups, and different CDM groups can be FDMed.

[0200] In the 1 symbol pattern (803), frequency-based CDM is applied to the same CDM group to distinguish two DMRS ports, and thus a total of six orthogonal DMRS ports can be configured. The 1 symbol pattern (803) may include a DMRS port ID mapped to each CDM group (the DMRS port ID for downlink may be indicated by the illustrated number + 1000). In the 2 symbol pattern (704), time / frequency-based CDM is applied to the same CDM group to distinguish four DMRS ports, and thus a total of twelve orthogonal DMRS ports can be configured. The 2 symbol pattern (804) may include a DMRS port ID mapped to each CDM group (the DMRS port ID for downlink may be indicated by the illustrated number + 1000).

[0201] As described above, in the NR system, two different DMRS patterns (e.g., DMRS patterns (801, 802) or DMRS patterns (803, 804)) can be configured, and it can also be configured whether each DMRS pattern is a one symbol pattern (801 or 803) or two adjacent symbol patterns (802 or 804). In addition, in the NR system, not only the DMRS port number is scheduled, but also the number of CDM groups scheduled together for PDSCH rate matching can be configured and signaled. In addition, in the case of CP-OFDM (cyclic prefix based orthogonal frequency division multiplex), both of the above-described DMRS patterns can be supported in the DL and UL, and in the case of DFT-S-OFDM (discrete Fourier transform spread OFDM), only DMRS type 1 among the above-described DMRS patterns can be supported in the UL.

[0202] Additionally, support may be provided for setting additional DMRS. Front-loaded DMRS refers to the first DMRS transmitted and received in the frontmost symbol in the time domain among DMRSs, and additional DMRS refers to DMRS transmitted and received in the symbol after the front-loaded DMRS in the time domain. In the NR system, the number of additional DMRSs can be set from a minimum of 0 to a maximum of 3. Additionally, when additional DMRSs are set, the same pattern as the front-loaded DMRS may be assumed. In one embodiment, when information on whether the DMRS pattern type described above is type 1 or type 2, information on whether the DMRS pattern is a one-symbol pattern or an adjacent two-symbol pattern, and information on the number of CDM groups used with the DMRS port are indicated for the front-loaded DMRS, when additional DMRSs are additionally set, it may be assumed that the additional DMRS has the same DMRS information as the front-loaded DMRS.

[0203] In one embodiment, the downlink DMRS settings described above can be set via RRC signaling as shown in below.

[0204] [Table 6]

[0205]

[0206] Here, dmrs-Type can set the DMRS type, dmrs-AdditionalPosition can set additional DMRS OFDM symbols, maxLength can set a 1 symbol DMRS pattern or a 2 symbol DMRS pattern, scramblingID0 and scramblingID1 can set scrambling IDs, and phaseTrackingRS can set PTRS (phase tracking reference signal).

[0207] Additionally, the uplink DMRS settings described above can be set through RRC signaling as shown in below.

[0208] [Table 7]

[0209]

[0210] Here, dmrs-Type can set the DMRS type, dmrs-AdditionalPosition (additional DMRS OFDM symbols can be set), phaseTrackingRS can set PTRS, maxLength can set 1 symbol DMRS pattern or 2 symbol DMRS pattern, scramblingID0 and scramblingID1 can set scrambling ID0s, nPUSCH-Identity can set cell ID for DFT-s-OFDM, sequenceGroupHopping can disable sequence group hopping, and sequenceHopping can enable sequence hopping.

[0211] FIG. 9 is a diagram illustrating an example of channel estimation using DMRS received on one PUSCH in a time band of a wireless communication system to which one embodiment of the present disclosure is applicable.

[0212] Referring to Fig. 9, when performing channel estimation for data decoding using DMRS, channel estimation can be performed within a PRG (precoding resource block group), which is a bundling unit, by utilizing PRB (physical resource blocks) bundling linked to the system band in the frequency band. In addition, in the time unit, the channel is estimated by assuming that only DMRS received on one PUSCH has the same precoding.

[0213] Below, we describe a time domain resource allocation (TDRA) method for data channels in a 5G communication system. A base station can configure a time domain resource allocation information table for a downlink data channel (physical downlink shared channel; PDSCH) and an uplink data channel (physical uplink shared channel; PUSCH) to a terminal through higher layer signaling (e.g., RRC signaling).

[0214] The base station may set a table with a maximum of maxNrofDL-Allocations=17 entries for PDSCH, and may set a table with a maximum of maxNrofUL-Allocations=17 entries for PUSCH. The time domain resource allocation information may include, for example, at least one of PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between a time point when a PDCCH is received and a time point when a PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between a time point when a PDCCH is received and a time point when a PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information on the position and length of a start symbol at which a PDSCH or a PUSCH is scheduled within a slot, and a mapping type of a PDSCH or a PUSCH.

[0215] In one embodiment, time domain resource allocation information for PDSCH can be set to a terminal through RRC signaling as shown in below.

[0216] [Table 8]

[0217]

[0218] Here, k0 represents the PDCCH-to-PDSCH timing (i.e., the slot offset between the DCI and the scheduled PDSCH) in slot units, mappingType represents the PDSCH mapping type, startSymbolAndLength represents the start symbol and length of the PDSCH, and repetitionNumber can represent the number of PDSCH transmission occasions according to the slot-based repetition method.

[0219] In one embodiment, time domain resource allocation information for PUSCH can be set to the terminal through RRC signaling as shown in below.

[0220] [Table 9]

[0221]

[0222] Here, k2 represents the PDCCH-to-PUSCH timing (i.e., the slot offset between the DCI and the scheduled PUSCH) in slot units, mappingType represents the PUSCH mapping type, startSymbolAndLength or StartSymbol and length represent the start symbol and length of the PUSCH, and numberOfRepetitions may represent the number of repetitions applied to the PUSCH transmission.

[0223] The base station can indicate to the terminal at least one entry of the table for the time domain resource allocation information via L1 signaling (e.g., downlink control information (DCI)) (e.g., by a 'time domain resource allocation' field in the DCI). The terminal can obtain the time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

[0224] The following describes the transmission of the uplink data channel (physical uplink shared channel; PUSCH) in a 5G system. PUSCH transmission can be dynamically scheduled by an UL grant in the DCI (e.g., referred to as dynamic grant (DG)-PUSCH) or by configured grant Type 1 or configured grant Type 2 (e.g., referred to as configured grant (CG)-PUSCH). Dynamic scheduling for PUSCH transmission can be indicated, for example, by DCI format 0_0 or 0_1.

[0225] PUSCH transmission of Configured Grant Type 1 can be semi-statically scheduled by receiving configuredGrantConfig containing rrc-ConfiguredUplinkGrant of Table 10 via higher layer signaling, without receiving UL grant in DCI. PUSCH transmission of Configured Grant Type 2 can be semi-persistently scheduled by UL grant in DCI after receiving configuredGrantConfig not containing rrc-ConfiguredUplinkGrant of Table 10 via higher layer signaling.

[0226] In one embodiment, when PUSCH transmission is scheduled by configured grant, parameters applied to PUSCH transmission can be configured through configuredGrantConfig, which is a higher layer signaling of , except for certain parameters (e.g., dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, or scaling of UCI-OnPUSCH) provided by pusch-Config, which is a higher layer signaling of . For example, if a terminal is provided with transformPrecoder in configuredGrantConfig, which is a higher layer signaling of , the terminal can apply tp-pi2BPSK in pusch-Config, which is a higher layer signaling of , to PUSCH transmission operated by configured grant.

[0227] [Table 10]

[0228]

[0229]

[0230] Next, the PUSCH transmission method is described. The DMRS antenna port for PUSCH transmission can be the same as the antenna port for SRS transmission. PUSCH transmission can follow a codebook-based transmission method or a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in the upper signaling, pusch-Config in [Table 7], is 'codebook' or 'nonCodebook'. As described above, PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can be semi-statically set by a configured grant.

[0231] If the UE is instructed to schedule PUSCH transmission via DCI format 0_0, the UE may perform beam configuration for PUSCH transmission using pucch-spatialRelationInfoID corresponding to a UE-specific, dedicated PUCCH resource with the lowest ID within an activated uplink partial bandwidth (BWP) within the serving cell. In one embodiment, PUSCH transmission may be performed based on a single antenna port. The UE may not expect scheduling for PUSCH transmission via DCI format 0_0 within a BWP where a PUCCH resource including pucch-spatialRelationInfo is not configured. If the UE has not configured txConfig in pusch-Config of [Table 11], the UE may not expect to be scheduled with DCI format 0_1.

[0232] [Table 11]

[0233]

[0234] Next, we describe codebook-based PUSCH transmission. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can operate semi-statically based on a configured grant. When codebook-based PUSCH transmission is dynamically scheduled via DCI format 0_1 ​​or semi-statically set via a configured grant, the UE can determine a precoder for PUSCH transmission based on the SRS resource indicator (SRI), the transmission precoding matrix indicator (TPMI), and the transmission rank (the number of PUSCH transmission layers).

[0235] In one embodiment, the SRI may be given through the SRS resource indicator field in the DCI or configured through the srs-ResourceIndicator higher-level signaling. The UE may be configured with at least one SRS resource when transmitting a codebook-based PUSCH, and may be configured with up to two SRS resources, for example. When the UE receives the SRI through the DCI, the SRS resource indicated by the SRI may refer to an SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. In addition, the TPMI and transmission rank may be given through the precoding information and number of layers fields in the DCI or configured through the precodingAndNumberOfLayers higher-level signaling. The TPMI may be used to indicate a precoder applied to PUSCH transmission.

[0236] The precoder to be used for PUSCH transmission can be selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper signaling SRS-Config. In codebook-based PUSCH transmission, the UE can determine the codebook subset based on the TPMI and the codebookSubset in the upper signaling pusch-Config. In one embodiment, the codebookSubset in the upper signaling pusch-Config can be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the UE to the base station.

[0237] If the UE reports 'partialAndNonCoherent' as the UE capability, the UE may not expect the value of the upper signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent'. Also, if the UE reports 'nonCoherent' as the UE capability, the UE may not expect the value of the upper signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports in the upper signaling SRS-ResourceSet indicates two SRS antenna ports, the UE may not expect the value of the upper signaling codebookSubset to be set to 'partialAndNonCoherent'.

[0238] A terminal can be configured with one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource within the SRS resource set can be indicated via SRI. If multiple SRS resources are configured in an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal can expect that the value of nrofSRS-Ports in the upper signaling SRS-Resource is set to the same value for all SRS resources.

[0239] The terminal transmits to the base station one or more SRS resources included in the SRS resource set in which the usage value is set to 'codebook' according to upper signaling, and the base station can select one of the SRS resources transmitted by the terminal and instruct the terminal to perform PUSCH transmission using transmission beam information of the corresponding SRS resource. In one embodiment, in codebook-based PUSCH transmission, the SRI is used as information for selecting an index of one SRS resource and can be included in the DCI. Additionally, the base station can transmit information indicating a TPMI and rank to be used by the terminal for PUSCH transmission, including this in the DCI. The terminal can perform PUSCH transmission by applying a precoder indicated by the indicated TPMI and rank based on the transmission beam of the corresponding SRS resource, using the SRS resource indicated by the SRI.

[0240] Next, we describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or can operate semi-statically via a configured grant. If at least one SRS resource is configured within an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be scheduled for non-codebook-based PUSCH transmission via DCI format 0_1.

[0241] For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be configured with an NZP (non-zero power) CSI-RS resource associated with one SRS resource set. The UE can perform calculations for a precoder for SRS transmission through measurements on the NZP CSI-RS resource associated with the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource associated with the SRS resource set and the first symbol of the aperiodic SRS transmission at the UE is less than a specific symbol (e.g., 42 symbols), the UE may not expect that information for the precoder for SRS transmission is updated.

[0242] If the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the NZP CSI-RS associated with the SRS-ResourceSet may be indicated by the SRS request field in DCI format 0_1 ​​or 1_1. In one embodiment, if the NZP CSI-RS resource associated with the SRS-ResourceSet is an aperiodic NZP CSI resource, and the value of the field SRS request in DCI format 0_1 ​​or 1_1 is not '00', it may indicate that the NZP CSI-RS associated with the SRS-ResourceSet exists. The DCI may not indicate cross carrier or cross BWP scheduling. If the value of the SRS request indicates the existence of the NZP CSI-RS, the NZP CSI-RS may be located in a slot in which a PDCCH including the SRS request field is transmitted. The TCI states set in the scheduled subcarriers may not be set to QCL-TypeD.

[0243] If a periodic or semi-persistent SRS resource set is configured, the NZP CSI-RS associated with the SRS resource set can be indicated through the associatedCSI-RS in the upper signaling SRS-ResourceSet. For non-codebook-based transmission, the UE may not expect that the upper signaling spatialRelationInfo for the SRS resource and the associatedCSI-RS in the upper signaling SRS-ResourceSet are configured together.

[0244] When multiple SRS resources are configured, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. In one embodiment, the SRI can be indicated through the SRS resource indicator field in the DCI or can be set through the srs-ResourceIndicator, which is a higher-order signaling. Similar to the codebook-based PUSCH transmission described above, when the UE is provided with an SRI through the DCI, the SRS resource indicated by the SRI can refer to an SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources can be determined by the UE capability reported by the UE to the base station. SRS resources transmitted simultaneously by the UE can occupy the same RB. The UE can configure one SRS port for each SRS resource. Only one SRS resource set with the usage value set to 'nonCodebook' in the upper signaling SRS-ResourceSet can be set, and up to four SRS resources for non-codebook-based PUSCH transmission can be set.

[0245] The base station transmits one NZP CSI-RS associated with an SRS resource set to the terminal, and the terminal can calculate a precoder to be used when transmitting one or more SRS resources within the SRS resource set based on the result measured upon reception of the NZP CSI-RS. When the terminal transmits one or more SRS resources within the SRS resource set in which usage is set to 'nonCodebook' to the base station, the terminal applies the calculated precoder, and the base station can select one or more SRS resources from among the received one or more SRS resources. In non-codebook based PUSCH transmission, the SRI can indicate an index that can express a combination of one or more SRS resources, and the SRI can be included in the DCI. The number of SRS resources indicated by the SRI transmitted by the base station can be the number of transmission layers of the PUSCH, and the terminal can transmit the PUSCH by applying the precoder applied to the SRS resource transmission for each layer.

[0246] The following describes a method for transmitting a single TB over multiple slots and for transmitting an uplink data channel (PUSCH) repeatedly in a 5G system. A 5G system can support two types of repeated transmission methods for an uplink data channel (e.g., PUSCH repetition transmission type A and PUSCH repetition transmission type B) and TB processing over multi-slot PUSCH (TBoMS), which transmits multiple PUSCHs over multiple slots in a single TB. Furthermore, a UE can be configured with either PUSCH repetition transmission type A or B through upper layer signaling. Furthermore, the UE can transmit TBoMS by receiving 'numberOfSlotsTBoMS' through a resource allocation table.

[0247] PUSCH repetitive transmission type A

[0248] - As described above, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method within one slot, and the base station can transmit the number of repeated transmissions to the terminal through upper layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The number of slots N set to numberOfSlotsTBoMS to determine TBS is 1.

[0249] - The terminal may repeatedly transmit an uplink data channel having the same start symbol and length as the uplink data channel set above in consecutive slots based on the number of repeated transmissions received from the base station. In one embodiment, if at least one symbol among the symbols in the slot set by the base station as downlink to the terminal or the slot for repeated transmission of uplink data channels set by the terminal is set as downlink, the terminal may omit uplink data channel transmission in the corresponding slot. For example, the terminal may not transmit an uplink data channel within the number of repeated transmissions of uplink data channels. On the other hand, a terminal supporting Rel-17 repeated transmission of uplink data determines a slot in which repeated transmission of uplink data is possible as an available slot, and can count the number of transmissions when repeatedly transmitting uplink data channels in a slot determined to be an available slot. If repeated transmission of an uplink data channel determined to be an available slot is omitted, repeated transmission can be performed through a slot that is available after postponing. Using below, a redundancy version can be applied according to the redundancy version pattern set for each nth PUSCH transmission occasion.

[0250] PUSCH repetitive transmission type B

[0251] - As described above, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method within one slot, and the base station can transmit the number of repetitions to the terminal through upper signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). In one embodiment, the number of slots N set to numberOfSlotsTBoMS to determine TBS is 1.

[0252] - First, based on the start symbol and length of the uplink data channel set above, the nominal repetition of the uplink data channel can be determined as follows. Here, the nominal repetition can mean the resource of the symbol set by the base station for PUSCH repetitive transmission, and the terminal can determine the resource that can be used for uplink from the set nominal repetition. In this case, the slot where the nth nominal repetition starts is The symbol given by and the nominal repetition starts from the starting slot is can be given by . The slot where the nth nominal repetition ends is The symbol given by and whose nominal repetition ends in the last slot is can be given by . Here, n=0,…numberofrepetitions-1, S represents the start symbol of the established uplink data channel, and L represents the symbol length of the established uplink data channel. indicates the slot in which the PUSCH transmission starts. can represent the number of symbols per slot.

[0253] - The terminal can determine an invalid symbol for PUSCH repetition transmission type B. A symbol configured for downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated can be determined as an invalid symbol for PUSCH repetition transmission type B. Additionally, an invalid symbol can be set based on a higher layer parameter (e.g., InvalidSymbolPattern). As an example, the higher layer parameter (e.g., InvalidSymbolPattern) can set an invalid symbol by providing a symbol-level bitmap spanning one or two slots. In one embodiment, a 1 in the bitmap can indicate an invalid symbol. Additionally, the period and pattern of the bitmap can be set via a higher layer parameter (e.g., periodicityAndPattern). If a higher layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the terminal may apply the invalid symbol pattern, and if it indicates 0, the terminal may not apply the invalid symbol pattern. Alternatively, if a higher layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not set, the terminal may apply the invalid symbol pattern.

[0254] - After an invalid symbol is determined in each nominal repetition, the terminal can consider symbols excluding the determined invalid symbol as valid symbols. If at least one valid symbol is included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Here, each actual repetition may refer to a symbol actually used for PUSCH repetitive transmission among the symbols set to the configured nominal repetition, and may include a continuous set of valid symbols that can be used for PUSCH repetitive transmission type B within one slot. The terminal may omit actual repetition transmission if an actual repetition with one symbol is set to valid, except when the symbol length L=1 of the configured uplink data channel. Using [Table 8] below, a redundancy version may be applied according to the configured redundancy version pattern for each n-th actual repetition.

[0255] TB processing over multiple slots (TBoMS)

[0256] - As described above, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method within one slot, and the base station can transmit the number of repeated transmissions to the terminal through higher layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). In one embodiment, TBS can be determined using a value of N greater than or equal to the number of slots set to numberOfSlotsTBoMS.

[0257] - The terminal may transmit an uplink data channel having the same start symbol and length as the uplink data channel set above in consecutive slots based on the number of slots and the number of repeated transmissions for determining the TBS received from the base station. In one embodiment, if at least one symbol among the symbols in the slots set by the base station as downlink to the terminal or the slots for repeated transmission of the uplink data channel set by the terminal is set as downlink, the terminal may omit uplink data channel transmission in the corresponding slot. For example, it may be included in the number of repeated transmissions of the uplink data channel but may not be transmitted.

[0258] On the other hand, a terminal supporting Rel-17 uplink data repetition transmission determines a slot in which uplink data repetition transmission is possible as an available slot, and can count the number of transmissions in the slot determined as an available slot when repeating uplink data channels. If the repeat transmission of the uplink data channel determined as an available slot is omitted, repeat transmission can be performed through a slot that is available after postponement. In one embodiment, using the following , a redundancy version can be applied according to a redundancy version pattern set for each nth PUSCH transmission occasion.

[0259] [Table 12]

[0260]

[0261] Below, we describe a method for determining uplink available slots for single or multiple PUSCH transmissions in a 5G system.

[0262] In one embodiment, when the terminal sets AvailableSlotCounting to enable, the terminal can determine an available slot based on the tdd-UL-DL-ConfigurationCommon, tdd-UL-DL-ConfigurationDedicated, ssb-PositionsInBurst, and TDRA (time domain resource allocation) information field values ​​for Type A PUSCH repeated transmission and TBoMS PUSCH transmission. That is, if at least one symbol set as TDRA for PUSCH in a slot for PUSCH transmission overlaps with at least one symbol for a purpose other than uplink transmission, the slot can be determined as an unavailable slot.

[0263] Below, we describe a method for reducing SSB density through dynamic signaling to save base station energy in 5G systems.

[0264] FIG. 10 is a diagram illustrating a method for re-establishing SSB transmission through dynamic signaling in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0265] Referring to FIG. 10, the terminal receives ssb-PositionsInBurst = '11110000' (1002) from the base station through upper layer signaling (SIB1 or ServingCellConfigCommon), and a maximum of two synchronization signal blocks at a subcarrier spacing of 30 kHz can be transmitted within 0.5 ms (or 1 slot length when 1 slot consists of 14 OFDM symbols), and accordingly, the terminal can receive 4 synchronization signal blocks (SSBs) within 1 ms (or 2 slot lengths when 1 slot consists of 14 OFDM symbols). At this time, the base station can reset the SSB transmission configuration information by broadcasting bitmap '1010xxxx' (1004) through Group / Cell common DCI (1003) having nwes-RNTI (network energy saving-Radio Network Temporary Identifier) ​​(or, es-RNTI) to reduce the density of SSB transmission for energy saving. At this time, transmission of SS block#1 (1005) and SSblock#3 (1006) can be canceled based on the bitmap (1004) set by Group / Cell common DCI. FIG. 10 provides a method (1001) for resetting SSB transmission through bitmap-based group / Cell common DCI.

[0266] In addition, the base station can reset the ssb-periodicity set through upper layer signaling via Group / Cell common DCI. In addition, by additionally setting timer information to indicate the application time of Group / Cell common DCI, SSB can be transmitted through SSB transmission information reset to Group / Cell common DCI during the set timer. Afterwards, when the timer expires, the base station can operate with the SSB transmission information set through the existing upper layer signaling. This can change the setting from normal mode to energy saving mode through the timer, and thereby reset the SSB configuration information. Alternatively, the base station can set the application time and period of the SSB configuration information reset through Group / Cell common DCI to the terminal using Offset and Duration information. In this case, the terminal may not monitor SSB during the Duration from the moment when the Group / Cell common DCI is received to the moment when the Offset is applied.

[0267] Below, we describe a BWP or BW adaptation method through dynamic signaling for base station energy saving in 5G systems.

[0268] FIG. 11 is a diagram illustrating a method for resetting BWP and BW through dynamic signaling in a wireless communication system to which one embodiment of the present disclosure is applicable.

[0269] Referring to Figure 11, the terminal can operate in activated BWP or BW through upper layer signaling and L1 signaling from the base station (1101). For example, a fixed power PSD B It can operate through a full BW of 100MHz. At this time, the base station uses the same power PSD for energy saving. BBW and BWP can be adjusted to activate a narrower BW of 40 MHz for the terminal (1102). At this time, the BW or BWP adjustment operation for energy saving of the base station can be set to match the BWP and BW settings that are set UE-specifically through the Group common DCI and the Cell specific DCI (1103). For example, UE#0 and UE#1 can have different BWP configurations and locations. At this time, the BW and BWP of all terminals can be set to be the same in order to save energy by reducing the BW used by the base station. At this time, the BWP or BW in the operation for energy saving can be set to one or more, and this can be used to set the BWP for each UE group.

[0270] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, 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. Although the embodiments of the present disclosure are described below using a 5G system as an example, the embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, this may include LTE or LTE-A mobile communication and mobile communication technologies developed after 5G. Therefore, the embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure as determined by a person skilled in the art. For example, the contents of the present disclosure can be applied to FDD (frequency division duplex), TDD (time division duplex), and XDD (cross division duplex) systems.

[0271] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0272] In describing the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0273] - MIB (Master Information Block)

[0274] - SIB (System Information Block) or SIB

[0275] - RRC (Radio Resource Control)

[0276] - MAC (Medium Access Control) CE (Control Element)

[0277] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the following physical layer channels or signaling.

[0278] - PDCCH (Physical Downlink Control Channel)

[0279] - DCI (Downlink Control Information)

[0280] - UE-specific DCI

[0281] - Group common DCI

[0282] - Common DCI

[0283] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0284] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0285] - PUCCH (Physical Uplink Control Channel)

[0286] - UCI (Uplink Control Information)

[0287] Hereinafter, the present disclosure will describe the above examples through a number of embodiments, but these are not independent, and one or more embodiments may be applied simultaneously or in combination. In the description of the present disclosure below, expressions such as that a specific device / component performs only a specific operation, performs only a specific function, or performs only a specific role, are not necessarily interpreted as being limited to the specific device / component performing only a specific operation / function / role, and may also mean that another operation / function / role corresponding to a specific operation / function / role of a specific device / component described in the description of the present disclosure is performed by another device / component. In other words, a specific device / component may not only perform a specific operation / function / role, but may also perform another operation / function / role other than the specific operation / function / role.

[0288] In the description of the present disclosure below, CPRI or eCPRI blocks are examples, and blocks according to other standards or technologies may also be used.

[0289] Below, a DRX alignment method through dynamic signaling for base station energy saving in a 5G system is described.

[0290] FIG. 12 is a diagram illustrating a method for re-establishing DRX through dynamic signaling of a wireless communication system to which one embodiment of the present disclosure is applicable.

[0291] Referring to Fig. 12, the base station can configure DRX in a UE-specific manner through upper layer signaling. For example, each terminal can be configured with different drx-LongCycle or drx-ShortCycle, drx-onDurationTimer, and drx-InactivityTimer. After that, the base station can configure UE-specific DRX settings in a UE group-specific or cell-specific manner through L1 signaling for energy saving (1201). Through this, the base station can achieve the same effect of saving power as the terminal through DRX for energy saving.

[0292] Below, we describe the discontinuous transmission (DTx) operation to reduce energy consumption of base stations in 5G systems.

[0293] FIG. 13 is a diagram illustrating a DTx method for base station energy saving to which one embodiment of the present disclosure is applicable.

[0294] Referring to FIG. 13, the base station can configure Discontinuous transmission (DTx) for energy saving through upper layer signaling (new system information block (SIB) for DTx or RRC signaling) and L1 signaling (DCI). At this time, the base station can set dtx-onDurationTimer (1305) for transmitting a reference signal for measuring PDCCH for scheduling DL SCH for DTx operation, RRM measurement, beam management, path loss, etc., dtx-InactivityTimer (1306) for receiving PDSCH after receiving PDCCH for scheduling DL SCH, dtx-offset (1304) for setting an offset between dtx-onDurationTimer after SS setting information for synchronization before dtx-onDurationTimer, and dtx-(Long)Cycle (1302) for DTx to operate periodically based on the above setting information. At this time, dtx-cycle can be set to multiple long cycles and short cycles. During the above DTx operation, the base station considers the transmitter to be in the off (or inactive) state, and therefore may not transmit DL CCH, SCH, and DL RS. That is, the base station can transmit downlink (PDCCH, PDSCH, RS, etc.) only during SS, dtx-onDurationTimer, and dtx-InactivityTimer during the DTx operation. At this time, SS-gapbetweenBurst or the number of SS bursts can be additionally set as additional information of the configured SS.

[0295] Below, a method for activating a base station through a gNB wake-up signal (WUS) during the base station's inactive mode to reduce energy consumption of the base station in a 5G system is described.

[0296] FIG. 14 is a diagram for explaining the operation of a base station according to a gNB wake-up signal to which one embodiment of the present disclosure is applicable.

[0297] Referring to Fig. 14, the base station can keep the transmitter end in the Off (or inactive) state while the base station is in an inactive state (or sleep mode) to save energy. Thereafter, the base station can receive a gNB wake-up signal (1402) from the terminal to activate the sleep mode of the base station. Thereafter, when the base station receives a WUS from the terminal through the Rx terminal, the base station can change the Tx terminal to the On (or active) state (1403). Thereafter, the base station can perform downlink transmission to the terminal. At this time, the base station can perform synchronization after Tx on and perform control and data transmission. In addition, various uplink signals, such as PRACH (physical random access channel), scheduling request (SR PUCCH), PUCCH including Ack, etc., can be considered as gNB WUS. Through the above method, the base station can save energy, and at the same time, the terminal can improve latency.

[0298] At this time, the base station can set a WUS occasion for receiving the gNB WUS and a Sync RS for synchronization before the terminal transmits the gNB WUS. At this time, the Sync RS can be considered as SSB, TRS (tracking reference signal), Light SSB (PSS+SSS, i.e., SSB composed of PSS and SSS), consecutive SSBs or new RS (continuous PSS + SSS), and in the case of WUS, PRACH, PUCCH with SR, or sequence-based signal can be considered. The SyncRS (1504) for the terminal to activate the deactivation mode for energy saving of the base station and the WUS occasion for receiving the WUS can be repeatedly transmitted with a WUS-RS periodicity (1405). In the case of FIG. 15, one embodiment is described by taking 1-to-1 mapping of Sync and WUS occasion as an example, but the present disclosure is not limited thereto. For example, Sync and WUS occasions can be N-to-1 mapped, 1-to-N mapped, or N-to-M mapped.

[0299] Below, a method for dynamically turning on / off the spatial domain elements (i.e., Antenna, PA or TxRUs (transceiver units or transmission radio units)) of a base station to save base station energy in a 5G system is described.

[0300] FIG. 15 is a diagram illustrating an antenna adaptation method of a base station for energy saving in a wireless communication system according to one embodiment of the present disclosure.

[0301] Referring to FIG. 15, the base station can adjust the Tx antenna port per RU (radio unit) for network energy savings (NWES) (1501). For example, since the PA of the base station accounts for most of the energy consumption of the base station, the base station can turn off the Tx antenna to save energy. At this time, the base station can refer to / use the RSRP (reference signal received power), CQI (channel quality indicator), and RSRQ (reference signal received quality) of the UE to determine whether the Tx antenna can be turned off. The base station can adjust the number of activated Tx antennas for each UE group or UE and transmit Tx. At this time, the base station can set information including one or more of beam information according to the antenna on / off or reference signal information (e.g., one or more of CSI resource, CSI resource set, or CSI report) to the UE through higher layer signaling (e.g., RRC signaling) or DCI signaling. Additionally, the base station can configure different antenna information for each BWP and reset the antenna information according to the BWP change. Furthermore, the base station can receive CSI feedback from the terminal to determine whether SD adaptation is possible. The base station can decide SD adaptation (based on the CSI feedback). The base station can receive multiple feedback from the terminal through antenna structure hypotheses of multiple antenna patterns for SD adaptation.

[0302] More specifically, the base station can apply multiple types (e.g., two types) of SD adaptation for energy saving (1502). For example, the multiple types can include Type 1 SD adaptation (1503) and Type 2 SD adaptation (1504).

[0303] When Type 1 SD adaptation (1503) is applied, the base station can adapt the number of antenna ports while maintaining the number of physical antenna elements per antenna port (i.e., logical port). At this time, the RF characteristics (e.g., tx power, beam) per port can be the same. Therefore, the terminal can measure the CSI-RS of the same port by combining them during CSI measurement (e.g., L1-RSRP (layer 1-RSRP), L3-RSRP (layer 3-RSRP, etc.).

[0304] Alternatively, when Type 2 SD adaptation (1504) is applied, the base station can have the same number of antenna ports (i.e., logical ports) and turn on / off the physical antenna elements per port (1504). At this time, the RF characteristics of each port can be different. During CSI measurement, the terminal can distinguish the CSI-RS of the same port and perform measurements separately. The base station can save energy through one or more of multiple types of SD adaptation methods, including the two types of SD adaptation methods described above.

[0305] Through the methods according to the above-described embodiment, energy consumption of a base station can be reduced. Furthermore, the methods according to the above-described embodiment can be configured / used singly or simultaneously through a combination of more than one.

[0306] Below, we describe a cell concept with new different features to reduce energy consumption of base stations in 5G or 6G systems.

[0307] FIG. 16 is a diagram illustrating an example of a cell concept having different functions for energy saving in a wireless communication system according to one embodiment of the present disclosure.

[0308] Referring to Figure 16, the base station can define / configure Cell#0 and Cell#1-X (e.g., Cell#1-0, Cell#1-1, Cell#1-2) that have different functions.

[0309] Cell type 1 (e.g., Cell#1-X (at least one of Cell#1-X), Access / sync cell) is for the mobility and synchronization and / or initial access operation of the terminal, and packet transmission for processing traffic may not be performed in Cell type 1 or may be transmitted only for limited packets in Cell type 1. More specifically, the base station may periodically transmit SSB and / or a new synchronization signal (SS) for the terminal in Idle / Inactive RRC state through Cell#0, and may transmit paging and / or system information. Configuration information for Cell#1-x capable of processing packets may be transmitted through the paging and / or system information.

[0310] Cell type 2 (e.g., Cell#1-X (at least one of Cell#1-X), Data cell) may be for processing packets of a terminal and / or a base station. More specifically, the base station can process packets of a terminal in an RRC connected state through Cell1-X. Therefore, it can be selectively activated when there is a packet according to traffic on-demand. If the base station initially activates Cell1-X for packet processing, the base station transmits SS (e.g., SSB, CSI-RS, TRS, or new SS) to synchronize Cell1-X with the terminal, and a terminal that has made initial access to Cell#0 or a synchronized terminal can receive SS of Cell1-X and handover to Cell1-X. At this time, Cell1-X to be activated on-demand may be determined by the base station serving Cell#0, the base station serving Cell#1-X, and / or the terminal attached to Cell#0.

[0311] A base station can support either Cell type 1 or Cell type 2, or both Cell type 1 and Cell type 2. Furthermore, one or more Cell type 2s can be connected to one or more Cell type 1s. Furthermore, coordination between Cell type 1s can be performed to activate Cell type 2s.

[0312] Through the above methods and the new cell concept, the energy consumption of the network system can be minimized.

[0313] Through the embodiments of the present disclosure, a cell selection method for appropriate packet processing for a terminal according to traffic in a cell deployment situation with cells performing different functions can be provided. More specifically, a cell selection method and a signaling method by a base station or a terminal can be provided.

[0314] Below, we describe cell selection methods and signaling procedures for energy-saving at base stations in 5G or 6G systems. Through these methods, base stations can activate appropriate data cells for terminals, maximizing energy-saving effects and ensuring service performance.

[0315] FIG. 17 is a diagram illustrating an example of an on-demand cell selection method in a wireless communication system according to one embodiment of the present disclosure.

[0316] Referring to FIG. 17, according to one embodiment, Cell type 2 (e.g., Data cells) capable of packet transmission may be configured to process traffic within the coverage of Cell type 1 (e.g., Access / Sync cell) that performs mobility and initial access functions. This may be for energy saving. Cell type 2 for processing traffic may be configured within the coverage of Cell type 1 that performs mobility and initial access functions. In this case, an appropriate Data cell for processing traffic after a terminal accesses an Access / Sync cell may be selected by one or a combination of the following methods.

[0317] [Method 1]-Cell based cell selection (1701)

[0318] According to one embodiment, the base station can select an appropriate data cell for each terminal based on geometry information of the terminal (e.g., at least one of location information, sector information, and / or direction information using beam). For example, when the terminal is initially accessed to Access / Sync cell#0, the terminal can handover or access an appropriate data cell among data cells#1 to #3 within Access / Sync cell#0 for packet processing. An access cell base station (a base station corresponding to the access cell, e.g., a base station operating the access cell) can select an appropriate data cell for the terminal and activate the data cell. For example, beam information can be used when the base station determines an appropriate cell for the UE. For example, the base station can select an appropriate cell using beam information (beam direction information) for synchronization in the Access / Sync cell of the terminal. For example, the beam for synchronization can correspond to an RS used for synchronization in the Access / Sync cell, and can be, for example, a best SSB or CSI-RS. For example, if the beam for synchronization is RS#0, RS#1, or RS#2, the base station can select / determine Data cell#1 among Data cell#1, #2, #3 corresponding to the direction and / or direction information of the corresponding beam (RS#0, RS#1, or RS#2).

[0319] On-demand cell selection based on an Access / Sync cell base station can be performed through the above method 1.

[0320] [Method 2]- Wake-up signal based cell selection (1702)

[0321] In one embodiment, a terminal can activate a data cell for transmitting and receiving packets through an uplink wake-up signal (WUS) for traffic processing. For example, a terminal accessing Access / Sync cell #0 can activate surrounding data cells (e.g., Data Cell #1 and / or Data Cell #3) to process traffic. At this time, the terminal can transmit a WUS to activate the data cells.

[0322] For example, WUS can be considered as sequence-based or one or more of PUCCH, PUSCH, PRACH, PSS, SSS, SRS or other RS ​​(reference signal). A data cell base station (a base station corresponding to a data cell, for example, a base station operating a data cell) can have a WUS receiver (WUR) to receive a separate WUS. In addition, a terminal can repeatedly transmit and / or retransmit a WUS. The terminal can determine and transmit the transmission power and carrier frequency of the WUS based on the information configured through the Access / Sync cell. At this time, the data cell base station that receives the WUS from the terminal becomes active, transmits an SS to the terminal, and can perform data transmission and reception for the subsequent packet. The data cell-related information configured by the terminal through the Access / Sync cell can include, for example, at least one of the following information.

[0323] - WUS occasion duration per carrier: WUS monitoring duration corresponding to carrier

[0324] - Periodicity of WUS occasion: 20 ms or 40 ms like as RACH occasion periodicity

[0325] - Start of WUS occasion per WUS design: system frame number (SFN)

[0326] - WUS response window: symbol level, slot level or time level value

[0327] - Carrier frequency and Carrier frequency list (for WUS)

[0328] - Carrier frequency and Carrier frequency list (for WUS response)

[0329] - Data cell ID 또는 physical cell ID (PCI) of data cell

[0330] - Time adjustment group between Access / sync cell and Data cell

[0331] - Data cell position information

[0332] - Number of WUS repetition

[0333] - Number of WUS retransmission

[0334] - Additional WUS occasion duration for WUS repetition

[0335] -WUS response transmission power

[0336] According to one embodiment, after receiving a WUS, activation of a data cell or access cell may be determined based on measurement information such as RSRP (reference signal received power) of the WUS, and / or after all data cells that received the WUS are activated, the terminal may receive SS transmitted from the activated data cell to select an appropriate data cell. For example, the terminal may measure SS from a data cell and select a data cell whose RSRP or RSRQ (reference signal received quality) exceeds a specific threshold or has the best RSRP or RSRQ.

[0337] According to one or more of the above methods, energy of an inactive base station can be saved by selecting an appropriate data cell for the terminal, and the terminal can receive service through the selected data cell.

[0338] According to one embodiment of the present disclosure, a signaling procedure for WUS-based data cell selection can be provided.

[0339] FIG. 18a and FIG. 18b are diagrams illustrating a procedure for on-demand cell selection in a wireless communication system according to one embodiment of the present disclosure.

[0340] Referring to FIG. 18A, according to one embodiment, a terminal may perform data cell selection through WUS transmission (UE-based cell selection and activation (1801)). A sync / access cell may always be activated (Tx / Rx on, which may mean that a transmission RF and a reception RF device including a modem are powered on), and data cells, cell2-A, cell2-B, and cell2-C, may have RFs for transmission and reception powered off, but WUR may always be on. Here, power off may be understood as deep / ultra deep sleep. The deep / ultra deep sleep may mean that most of the components of the base station are powered off, and for example, the modem, backhaul, memory, cooler, etc. may all be turned off. In addition, the sync / access cell and the data cell may exchange information for network energy saving. Information for network energy saving that is transmitted and received between the sync / access cell and the data cell may include at least one of the following information: a network energy saving scheme applied to each cell, information about WUS that each cell can support, and at least one of the information included in the data cell-related information described above.

[0341] A terminal can perform a RACH procedure for initial access to an Access / Sync cell. In addition, the terminal can receive configuration information (e.g., one or more of WUS occasion, carrier frequency, WUS response window, or carrier frequency for WUS response) of a data cell associated with the corresponding cell from the Access / Sync cell. Thereafter, the terminal can transmit a WUS to one or more data cells based on the data cell configuration information set above. At this time, base stations that receive the WUS transmitted from the terminal can be activated and transmit a reference signal for synchronization (and / or access) to the terminal. The terminal can select a data cell based on the measurement of the reference signal and perform a handover (and / or access) to the data cell.

[0342] Alternatively, referring to FIG. 18b, the access cell base station can perform data cell selection based on the WUS transmitted by the terminal (Cell-based cell selection and activation (1802)). The sync / access cell can always be activated (Tx / Rx on), and the data cells, cell2-A, cell2-B, and cell2-C, can have RF for transmission and reception powered off, but the WUR can always be on. In addition, the sync / access cell and the data cell can exchange information for network energy saving. The information for the network energy saving can refer to the above-described content.

[0343] A terminal can perform a RACH procedure for initial access to an Access / Sync cell. In addition, the terminal can receive configuration information of a data cell associated with the cell from the Access / Sync cell. Thereafter, the terminal can transmit a WUS to one or more data cells based on the data cell configuration information set above. At this time, the data cells and / or data cell base stations that have received the WUS transmitted from the terminal can report WUS measurement information to the Access / Sync cell. At this time, whether or not to report the WUS measurement can be determined by the data cell based on the WUS measurement. More specifically, if the RSRP or RSRQ of the WUS measured by the data cell is lower than a threshold, the data cell can omit the WUS measurement report. Thereafter, the Sync / Access cell can select one data cell and activate it. The activated data cell can transmit a reference signal for synchronization (and / or access) to the terminal. The terminal can receive the reference signal from the data cell and handover (or access) to the data cell. Alternatively, if the reception status of the reference signal is poor, the terminal may transmit WUS again. For example, if the RSRP or RSRQ of the reference signal is below / below a certain threshold, the terminal may transmit WUS again, and the Cell-based cell selection and activation (1802) process described above may be performed again.

[0344] Through one or more of the above methods, a terminal or base station can select an appropriate data cell based on the terminal's WUS. This allows for cell selection that considers the channel between the data cell and the terminal, by selecting the best data cell specific to each terminal. This allows the base station to save energy from inactive data cells, while the terminal can obtain high-performance services.

[0345] The first and second embodiments described below may be implemented separately and / or at least partially combined. Furthermore, the first through fourth embodiments described below may be implemented separately and / or at least partially combined. Furthermore, the first through fourth embodiments described below may be implemented separately and / or at least partially combined with at least some of the embodiments described above.

[0346] <Example 1>

[0347] A first embodiment of the present disclosure may be for the structure of a communication system for receiving WUS. As described above, an example of a receiver structure of a base station for receiving WUS is described for energy saving of the base station. More specifically, a new structure of a base station is proposed by considering a radio frequency front-end (RF-FE) part (e.g., including a PA / LNA (power amplifier / low noise amplifier), a duplexer, a filter, etc.) and a digital front-end (DFE) part (e.g., including functions such as automatic gain control (AGC), DPD, and CFR) of the base station. According to one embodiment, a base station including a receiver for receiving WUS (i.e., a radio unit (RU) or RU+distributed unit (DU) (RU and DU) or a transmission and reception point (TRP)) can be designed with one or a combination of the structures of the base stations below.

[0348] [Structure 1]

[0349] Structure 1 according to one embodiment provides a system structure comprising a main radio (MR) for transmitting and receiving existing channels and signals and a dual receiver having a wake-up signal receiver (WUR). More specifically, an RU having dual receivers can maintain a connection with a base station (DU). This is so that even if a WUS is received, rather than immediately activating the MR, the DU reports WUS measurements to the DU through an individual WUS controller so that the DU can activate a specific RU (i.e., a base station or cell).

[0350] FIG. 19 is a diagram illustrating a novel structure of a wireless communication system according to one embodiment of the present disclosure. FIG. 19 may be understood as an example of the structure of a base station or the structure of an RU of a base station according to one embodiment of the present disclosure, but is not limited thereto.

[0351] The components illustrated in the drawing are exemplary diagrams of the functions of the transceiver structure. In the case of a duplexer, it can perform the role of branching the transceiver and the receiver by using antennas such as Tx and Rx or WUR Rx. BPF (bandpass filter) and LPF (low pass filter) can be used for purposes such as detecting a desired signal and removing noise by receiving only signals of a specific band. In addition, PA (power amplifier) ​​and LNA (low noise amplifier) ​​can perform the role of amplifying the size of the transmit and receive signals. LO (local oscillator) is used for down conversion to a specific frequency and I / Q (in-phase quadrature) (complex) conversion, and can also be used for the synchronization frequency of the entire system. Afterwards, DAC and ADC are used to convert between analog signals and digital signals, and in the case of digital signals, they are used and processed in the DFE. At this time, the DFE can perform crest factor reduction (CFR) functions to improve PAPR and digital pre-distortion (DPD) functions to improve PA nonlinearity. In addition, the DFE can perform automatic gain control (AGC) functions to control the gain of the received signal. CPRI and eCPRI can be used for connection between the RU and the DU. The above description describes representative functions of the configuration and is not limited to this function. The description of the above-described components can be equally applied to an embodiment of the present disclosure described with reference to other drawings in addition to FIG. 19.

[0352] Referring to FIG. 19, a base station may include a transmitter (Tx, 1902) and a receiver (Rx, 1903) capable of transmitting and receiving channels or signals for synchronization and packet transmission (1901). In addition, a receiver (1905) for a specific wake-up signal to activate or deactivate the base station may be included (1904). In the Tx (1902), the signal path may pass through a CPRI or eCPRI block, a DFE (MR AGC), a DAC (digital analog converter), a LPF, an LO, a PA, a BPF, and a duplexer to reach an antenna. In the Rx (1903), the signal path may pass through an antenna, a duplexer, a BPF, an LNA, an LO, an LPF, an ADC, a DFE, and a CPRI or eCPRI block. In the Rx (1905), the signal path may pass through an antenna, a BPF, an LNA, an LO, an LPF, an ADC, a DFE, and a WUS controller (WUR AGC, eCPRI). Additionally, at least some of the components shown in the MR (1901) and the components shown in the WUR (1904) may be shared components rather than separate components.

[0353] Figure 19 provides a block diagram illustrating exemplary functions of a transceiver. More specifically, in the structure of a system having dual receivers, a switch may be implemented to share elements performing a specific identical function. In this case, impedance matching and calibration functions for performance degradation due to the switch may be added through a separate feedback circuit for each DFE or switch. More specifically, the receiver structure of a base station according to one embodiment may be implemented using one or a combination of the following structures.

[0354] [Structure 1-1]

[0355] The dual receiver can share an antenna, which is a passive component. At this time, the dual receiver can be connected to switch A or B (point A or point B) depending on the wake-up signal reception or synchronization and packet transmission / reception operation. When connected to B, the base station can perform an operation for receiving a wake-up signal. When connected to A, the base station can perform an operation for synchronization and packet transmission / reception. Through this, the size of the base station due to the antenna can be implemented more efficiently.

[0356] [Structure 1-2]

[0357] The dual receiver can share a band pass filter (BPF) or a low pass filter (LPF). More specifically, the dual receiver can be designed as an Nth-order filter using an amplifier to have gain for the strength of the signal in the case of the band pass filter or the low pass filter. At this time, depending on the performance requirement required for wake-up signal reception or synchronization and packet transmission / reception operation, the switch can be connected from the middle of the Nth-order filter to operate using only Nth-order or fewer filters (1907, 1910). For example, the switch can be connected so that at least some filters among the Nth-order filters are operated. For example, if the first to fifth filters are designed as 5th-order filters, the switch can be connected between each filter. For example, the switch can be connected between the first and second filters, between the second and third filters, between the third and fourth filters, between the fourth and fifth filters, and after the fifth filter. For example, if a switch is connected between the third and fourth filters, the first through third filters can be activated. This allows the base station to receive wake-up signals, satisfy requirements, and process synchronization and packets while using less energy in the filters.

[0358] [Structure 1-3]

[0359] Dual receivers can share a low noise amplifier (LNA). For example, in case of an RU (or massive MIMO unit (MMU)) with 8 or 64 LNAs to support 8Tx8Rx (8 transmit, 8 receive MIMO) or 64Tx64Rx (64 transmit, 64 receive MIMO), a receiver that receives only wake-up signals can operate by sharing only a smaller number of LNAs for efficient energy saving (1908). The structure for partially sharing LNAs can be fixed in the initial hardware design and / or can be implemented so that the number is set according to configuration information through a configurable switch. For example, if the LNA consists of 8 RUs, RU#5 to RU#8 can be operated. Through this, the base station can save cost and improve energy efficiency by sharing LNAs.

[0360] [Structure 1-4]

[0361] Dual receivers can share a mixer and local oscillator (LO). When the wake-up signal can be used for down-conversion or direct conversion through the same carrier frequency or through the LO of the receiver used for synchronization and packet processing, the mixer and LO can be shared through a switch (1909). On the other hand, in the case of a wake-up signal transmitted on a lower carrier frequency or a non-coherent wake-up signal, a lower-spec LO, such as an LO that only supports a lower frequency or has lower resolution performance, can be used for down-conversion and direct conversion. This can reduce the power consumption of the mixer and LO. In the case of a lower-spec LO, the lower-spec LO can be used regardless of the wake-up signal to save energy.

[0362] [Structure 1-5]

[0363] Dual receivers can share an Analog-to-Digital Converter (ADC). The receiver's ADC can be used for synchronization and packet processing to convert analog wake-up signals into digital signals. This allows for the implementation of a receiver that receives wake-up signals without a separate ADC (1911). This reduces the cost and size of the base station.

[0364] As in the above structures, a receiver for receiving a wake-up signal can be implemented by reusing elements used for synchronization and packet processing. That is, a WUR can be implemented by sharing some elements of the receiver of the NR MR as described above. The WUR can include some elements shared with the NR MR.

[0365] At this time, for the non-shared elements (e.g., elements applied to the non-shared part of the MR elements as elements for WUR), BFP, LNA, LO, mixer, LPF, and ADC that have been redesigned only for the purpose of receiving the wake-up signal can be utilized. Afterwards, a WUS controller for detecting WUS can be included in the RU according to the design (e.g., sequence or format) of the wake-up signal. The WUS controller can confirm the WUS sequence or ID through the correlation of the WUS and determine whether to detect the WUS after the correlation through a comparator. At this time, the RU can support CPRI (Common Public Radio Interface) or eCPRI (enhanced Common Public Radio Interface) for connection with the DU, and for this purpose, the WUS controller can support individual eCPRI. In addition, an individual AGC function can be implemented in the WUS controller to process inputs received through different receivers. The digital processing functions implemented through the above FPGA or SoC (system on chip) can follow the detailed description of the second embodiment below. In addition, the structure described above is one embodiment and does not limit the scope of the present disclosure, and can be designed as a new receiver (e.g., an envelope detector) depending on the wake-up signal.

[0366] Using the RU with the above dual receiver, WUS can be received and the WUS measurement can be reported to the DU via the WUS controller's eCPRI or CPRI. The DU can then activate the optimal RU based on its decision. Through this function, the base station can obtain appropriate cell selection and energy-saving effects for the terminal through the DU. In addition, positioning and mobility of the terminal within the access cell can be supported through the WUS.

[0367] [Structure 2]

[0368] Structure 2 according to one embodiment provides a system structure comprising a main radio (MR) for transmitting and receiving existing channels and signals and a dual receiver having a wake-up signal receiver (WUR). More specifically, an RU having dual receivers can maintain a connection with a base station (DU). This is so that even if a WUS is received, rather than immediately activating the MR, the RU reports the WUS measurement to the DU so that the DU can activate a specific RU (i.e., a base station or cell). In this case, the same eCPRI or CPRI can be reused for the connection between the RU and the DU.

[0369] FIG. 20 is a diagram illustrating a novel structure of a wireless communication system according to one embodiment of the present disclosure. FIG. 20 may be understood as an example of the structure of a base station or the structure of an RU of a base station according to one embodiment of the present disclosure, but is not limited thereto.

[0370] Referring to FIG. 20, a base station may include a transmitter (Tx, 2002) and a receiver (Rx, 2003) capable of transmitting and receiving channels or signals for synchronization and packet transmission (2001). In addition, a receiver (2005) for a specific wake-up signal to activate or deactivate the base station may be included (2004). In the Tx (2002), the signal path may pass through a CPRI or eCPRI block, a DFE (MR AGC), a DAC, an LPF, an LO, a PA, a BPF, and a duplexer to reach an antenna. In the Rx (2003), the signal path may pass through an antenna, a duplexer, a BPF, an LNA, an LO, an LPF, an ADC, a DFE, and a CPRI or eCPRI block. In WUR Rx (2005), the signal path may pass through an antenna, BPF, LNA, LO, LPF, ADC, DFE, WUS controller (WUR AGC), DFE (MR AGC), and CPRI or eCPRI blocks. That is, the DFE and CPRI or eCPRI blocks may be shared / used together / reused between MR and WUR. In addition, at least some of the components shown in MR (2001) and WUR (2004) may be shared components rather than separate components.

[0371] Figure 20 provides a block diagram of exemplary functions of a transceiver. More specifically, in the structure of a system having dual receivers, a switch may be implemented to share elements performing a specific identical function. In this case, impedance matching and calibration functions according to performance degradation due to the switch may be added through a separate feedback circuit for each DFE or switch. More specifically, the receiver structure of a base station according to one embodiment may be implemented using one or a combination of the following structures.

[0372] [Structure 2-1]

[0373] Dual receivers can share an antenna, which is a passive component. At this time, the dual receiver can be connected to switch (2006) A or B depending on the wake-up signal reception or synchronization and packet transmission / reception operation. When connected to B, the base station can perform an operation for receiving a wake-up signal. When connected to A, the base station can perform an operation for synchronization and packet transmission / reception. Through this, the size of the base station due to the antenna can be implemented more efficiently.

[0374] [Structure 2-2]

[0375] The dual receiver can share a band-pass filter (BPF) or a low-pass filter (LPF). More specifically, the band-pass filter or low-pass filter can be designed as an N-th order filter using an amplifier to have gain for signal strength. At this time, depending on the performance requirements required for wake-up signal reception or synchronization and packet transmission / reception operations, the switch can be connected from the middle of the N-th order filter to operate using only N-th or fewer filters (2007, 2010). For example, the switch can be connected so that at least some of the N-th order filters are operated. For example, if the first to fifth filters are designed as 5th order filters, the switch can be connected between each filter. For example, the switch can be connected between the first and second filters, between the second and third filters, between the third and fourth filters, between the fourth and fifth filters, and after the fifth filter. For example, if the switch is connected between the third and fourth filters, the first to third filters can be operated. This allows the base station to receive wake-up signals, satisfy requirements, and process synchronization and packets while using less energy in the filter.

[0376] [Structure 2-3]

[0377] Dual receivers can share a low noise amplifier (LNA). For example, in case of an RU (or massive MIMO unit (MMU)) with 8 or 64 LNAs to support 8Tx8Rx or 64Tx64Rx, a receiver that receives only wake-up signals can operate by sharing only a smaller number of LNAs for efficient energy saving (2008). For example, if the LNA consists of 8 RUs, RU#5 to RU#8 can be operated. Through this, the base station can save costs and improve energy efficiency by sharing LNAs.

[0378] [Structure 2-4]

[0379] Dual receivers can share a mixer and local oscillator (LO). When the wake-up signal can be used for down-conversion or direct conversion through the same carrier frequency or through the LO of the receiver used for synchronization and packet processing, the mixer and LO can be shared through a switch (2009). On the other hand, in the case of a wake-up signal transmitted on a lower carrier frequency or a non-coherent wake-up signal, a lower-spec LO, such as an LO that only supports a lower frequency or has lower resolution performance, can be used for down-conversion and direct conversion. This can reduce the power consumption of the mixer and LO. In the case of a lower-spec LO, the lower-spec LO can be used regardless of the wake-up signal to save energy.

[0380] [Structure 2-5]

[0381] Dual receivers can share an ADC. The receiver's ADC can be used for synchronization and packet processing to convert analog wake-up signals into digital signals. This allows for the implementation of a receiver that receives wake-up signals without a separate ADC (2011). This reduces the cost and size of the base station.

[0382] As in the above structures, a receiver for receiving a wake-up signal can be implemented by reusing elements used for synchronization and packet processing. That is, a WUR can be implemented by sharing some elements of the receiver of the NR MR as described above. The WUR can include some elements shared with the NR MR.

[0383] At this time, for the non-shared elements (e.g., elements applied to the non-shared portion of the MR elements as elements for WUR), BFP, LNA, LO, mixer, LPF, and ADC redesigned only for the purpose of receiving the wake-up signal can be utilized. Afterwards, a WUS controller for detecting WUS can be included in the RU according to the design (e.g., sequence or format) of the wake-up signal. The WUS controller can confirm the WUS sequence or ID through the correlation of the WUS and determine whether to detect the WUS after the correlation through a comparator. At this time, the WUR (2004) can receive the WUS and support only the role of detection. That is, the WUR (2004) can perform the role of receiving and detecting the WUS. Afterwards, the WUS detection and measurement information can be transmitted from the WUS controller to the MR and reported to the DU using CPRI or eCPRI. That is, the WUS controller can transmit WUS detection and measurement information to the MR (and / or DU). For example, CPRI or eCPRI can be used for transmission. Accordingly, the RU can support CPRI or eCPRI of the MR (2001) for connection with the DU. In addition, individual AGC functions can be implemented in the WUS controller to process inputs received through different receivers. The digital processing functions implemented through the FPGA or SoC can follow the detailed description of the second embodiment below.Furthermore, the above-described structure does not limit the scope of the present disclosure to one embodiment, and may be designed as a new receiver (e.g., an envelope detector) based on a wake-up signal. In this case, the shared function can be shared through a switch in a device that supports the shared function.

[0384] Using the RU with the above dual receiver, the base station can receive the WUS and report the WUS measurement to the DU. The DU can then activate the optimal RU based on its decision. This function allows the base station to achieve appropriate cell selection and energy-saving effects for the terminal through the DU. In addition, positioning and mobility of the terminal within the access cell can be supported through the WUS.

[0385] [Structure 3]

[0386] Structure 3 according to one embodiment provides a system structure comprising a dual receiver having a main radio (MR) for transmitting and receiving existing channels and signals and a wake-up signal receiver (WUR). More specifically, an RU having dual receivers can maintain minimal connection with a DU (e.g., can only transmit and receive trigger signals or only receive simultaneous signals for WUR from the DU).

[0387] More specifically, one embodiment proposes an RU that operates asynchronously with the DU, independently using WUR for RU activation and / or deactivation, without the connection that provides synchronization and activation / deactivation of the RU by being connected to the DU as proposed in Structure 1 or Structure 2. Alternatively, one embodiment provides a method for the RU to determine the RU operation using WUR in a mode in which only signals for minimal synchronization or reconnection between the RU and the DU are transmitted and received. For example, the mode may be determined in the DU or the CU. In one embodiment, when the mode is set such that only signals for synchronization or reconnection between the RU and the DU are transmitted and received, the RU operation using WUR may be provided. In this case, a part of eCPRI or CPRI may be reused for the connection between the RU and the DU. Through this, the power consumed for the connection with the DU in the FPGA or SoC may be minimized.

[0388] FIG. 21 is a diagram illustrating a novel structure of a wireless communication system according to one embodiment of the present disclosure. FIG. 21 may be understood as an example of the structure of a base station or the structure of an RU of a base station according to one embodiment of the present disclosure, but is not limited thereto.

[0389] Referring to FIG. 21, a base station may include a transmitter (Tx, 2102) and a receiver (Rx, 2103) capable of transmitting and receiving channels or signals for synchronization and packet transmission (2101). In addition, a receiver for a specific wake-up signal for activating or deactivating the base station may be included (2104). In the Tx (2102), the signal path may pass through a DFE (MR AGC), a DAC, an LPF, an LO, a PA, a BPF, and a duplexer to an antenna. In the Rx (2103), the signal path may pass through an antenna, a duplexer, a BPF, an LNA, an LO, an LPF, an ADC, and a DFE. In the WUR (2104), the signal path may pass through an antenna, a BPF, an LNA, an LO, an LPF, an ADC, a DFE, a WUS controller (WUR AGC), and a DFE (MR AGC). That is, the DFE can be shared / used together / reused between the MR and the WUR. In addition, at least some of the elements shown in the MR (2101) and the elements shown in the WUR (2104) may be shared elements rather than separate elements.

[0390] Figure 21 provides a block diagram illustrating exemplary functions of a transceiver. More specifically, in the structure of a system having dual receivers, a switch may be implemented to share elements performing a specific identical function. In this case, impedance matching and calibration functions for performance degradation due to the switch may be added through a separate feedback circuit for each DFE or switch. More specifically, the receiver structure of the base station may be implemented using one or a combination of the following structures.

[0391] [Structure 3-1]

[0392] The dual receiver can share an antenna, which is a passive element. At this time, the dual receiver can be connected to switch (2105) A or B depending on the wake-up signal reception or synchronization and packet transmission / reception operation. When connected to B, the base station can perform an operation for receiving a wake-up signal. When connected to A, it can perform an operation for synchronization and packet transmission / reception. Through this, the size of the base station due to the antenna can be implemented more efficiently.

[0393] [Structure 3-2]

[0394] The dual receiver can share a band pass filter (BPF) or a low pass filter (LPF). More specifically, the dual receiver can be designed as an N-th order filter using an amplifier to have gain for the strength of the signal in the case of the band pass filter or the low pass filter. At this time, depending on the performance requirement required for wake-up signal reception or synchronization and packet transmission / reception operation, the switch can be connected from the middle of the N-th order filter to operate using only the N-th order or fewer filters (2106, 2109). For example, the switch can be connected so that at least some filters among the N-th order filters are operated. For example, if the first to fifth filters are designed as 5-th order filters, the switch can be connected between each filter. For example, the switch can be connected between the first and second filters, between the second and third filters, between the third and fourth filters, between the fourth and fifth filters, and after the fifth filter. For example, if a switch is connected between the third and fourth filters, the first through third filters can be activated. This allows the base station to receive wake-up signals, satisfy requirements, and process synchronization and packets while using less energy in the filters.

[0395] [Structure 3-3]

[0396] Dual receivers can share a low noise amplifier (LNA). For example, in case of an RU (or massive MIMO unit (MMU)) with 8 or 64 LNAs to support 8Tx8Rx or 64Tx64Rx, a receiver that receives only a wake-up signal can operate by sharing only a smaller number of LNAs for efficient energy saving (2107). For example, if the LNA is composed of 8 RUs, RU#5 to RU#8 can be operated. Through this, the base station can save costs and improve energy efficiency by sharing LNAs.

[0397] [Structure 3-4]

[0398] Dual receivers can share a mixer and local oscillator (LO). When the wake-up signal can be used for down-conversion or direct conversion through the same carrier frequency or the LO of the receiver used for synchronization and packet processing, the mixer and LO can be shared through a switch (2108). On the other hand, in the case of a wake-up signal transmitted through a lower carrier frequency or a non-coherent wake-up signal, a lower-spec LO, such as an LO that only supports a lower frequency or has lower resolution performance, can be used for down-conversion and direct conversion. This can reduce the power consumption of the mixer and LO. In the case of a lower-spec LO, the lower-spec LO can be used regardless of the wake-up signal for energy saving.

[0399] [Structure 3-5]

[0400] Dual receivers can share an ADC. The receiver's ADC can be used for synchronization and packet processing to convert analog wake-up signals into digital signals. This allows for the implementation of a receiver that receives wake-up signals without a separate ADC (2110). This reduces the cost and size of the base station.

[0401] As in the above structures, a receiver for receiving a wake-up signal can be implemented by reusing elements used for synchronization and packet processing. That is, a WUR can be implemented by sharing some elements of the receiver of the NR MR as described above. The WUR can include some elements shared with the NR MR.

[0402] At this time, for the non-shared elements (for example, elements applied to the non-shared portion of the MR elements as elements for WUR), BFP, LNA, LO, mixer, LPF, ADC redesigned only for the purpose of receiving the wake-up signal can be utilized. Afterwards, a WUS controller for detecting WUS can be included in the RU according to the design (for example, sequence or format) of the wake-up signal. The WUS controller can confirm the WUS sequence or ID through the correlation of the WUS and determine whether to detect the WUS after the correlation through a comparator. At this time, the WUR (2104) can receive the WUS and support only the roles of detection and measurement. That is, the WUR (2104) can perform the roles of receiving and detecting the WUS. At this time, in the case of the RU of structure 3, the RU itself can determine whether to activate by looking at the signal status of the received WUS without being connected to the DU. Furthermore, more specifically, individual AGC functions may be implemented in the WUS controller to process inputs received through different receivers. The digital processing functions implemented through the FPGA or SoC may follow the detailed description of the second embodiment below. Furthermore, the structure described above does not limit the scope of the present disclosure to one embodiment, and may be designed as a new receiver (e.g., an envelope detector) depending on the wake-up signal.

[0403] According to one embodiment, a new RU structure including WUR is proposed through the above structures. Through the above structures, the RU itself or the DU can determine whether to activate the WUS based on the received WUS signal strength and quality. In the above structure, information shared between the RU and the DU may include synchronization information, activation / deactivation signal (start up signaling), WUS ID, WUS measurement (e.g., RSRP, RSRQ, and SINR), and WUS threshold information. Synchronization information, activation / deactivation signal, WUS ID, WUS measurement (e.g., RSRP, RSRQ, and SINR), and WUS threshold information may be transmitted and received between the RU and the DU. The WUS threshold information corresponds to the WUS measurement and may correspond to RSRP, RSRQ, and / or SINR. Based on the above configuration information, the RU can measure the WUS and compare it with the configured WUS threshold to determine whether to detect and report the WUS, and finally determine whether to activate the entire RU. For example, by comparing the measurement result of WUS with the WUS threshold, if the measurement result of WUS is equal to or greater than the WUS threshold, the RU can determine whether to detect WUS and report WUS. When the RU receives an activation signal (start up signaling), it can transmit RS to the terminal. In addition, the reception function according to the mode can be determined through the switch depending on whether WUR operation or MR operation is in progress. In addition, the delay according to switching using the switch and calibration after switching can be determined by the requirement and UE capability.Additionally, the dual receiver structure of the above structure can be applied to devices having a transceiver structure, not limited to base stations. For example, a terminal can expect energy saving effects through the dual receiver structure.

[0404] <Example 2>

[0405] A second embodiment of the present disclosure provides a structure of a digital front-end (DFE). A second embodiment of the present disclosure provides an AGC implementation method according to a new RU having a dual receiver including a WUR.

[0406] FIG. 22 is a diagram illustrating a new digital front end structure of a wireless communication system according to one embodiment of the present disclosure.

[0407] Referring to Fig. 22, an RU having a dual receiver structure can implement an AGC function for AGC settings of each receiver in the digital front-end. The digital front-end can be designed with one of the following structures or a combination thereof.

[0408] [Structure 1 (2201)]

[0409] Structure 1 according to one embodiment can process AGC for gain control of receiver of MR for synchronization and packet processing and AGC function of WUR for wake-up signal reception within a single digital front-end (DFE).

[0410] More specifically, when each of MR or WUR operates, AGC settings are made through different AGC circuits, which can be connected to each path of MR and WUR signals. MR radio AGC and WUR AGC (and WUR controller) can be connected to each signal path. In addition, a buffer that remembers each previous AGC setting value can be included. The MR radio AGC can be connected to the MR buffer or can include the MR buffer. The WUR AGC can be connected to the WUR buffer or can include the WUR buffer. At this time, the RU can support not only a single mode of MR or WUR, but also a mode in which MR and WUR operate simultaneously. Through this, the RU can always operate MR and WUR independently, and support mobility through WUR and synchronization and packet processing through MR. Afterwards, the output that has gone through AGC can be transmitted to CPRI or eCPRI.

[0411] [Structure 2 (2202)]

[0412] Structure 2 according to one embodiment provides a circuit that supports AGC setting of MR and WUR using a digital front-end (DFE) having a single AGC. If the RU operates by switching MR and WUR according to a mode, the RU can process the received signals of MR and WUR using a single DFE. At this time, the AGC setting of the receiver can be performed through a single AGC circuit of a single DFE, and the record values ​​for AGC setting can be received and operated through each MR buffer and WUR buffer according to the switching of MR and WUR modes. At this time, the input signal can be determined through a switching function before the AGC according to the mode switching of MR and WUR. When the DFE is connected to the WUR controller according to the switching, the WUR can be operated, and when the WUR is not connected, the MR can be operated. A delay for the switching can be determined as a requirement.

[0413] [Structure 3 (2203)]

[0414] Structure 3 according to one embodiment provides a circuit for AGC setting of an RU having a plurality of MR digital front-ends (DFEs) and WUR digital front-ends (DFEs). More specifically, an RU having dual receivers may include independent DFEs for each MR and WUR. For example, the DFE of the MR may be implemented through an FPGA, and the DFE of the WUR may be implemented as an Integrated Circuit (IC) chip. The FPGA and the IC may be connected and operated. That is, the DFE of the MR and the DFE of the WUR may be connected and operated. And / or both the MR and the WUR may be implemented as separate FPGAs or SoCs. In this case, the AGC setting may be operated in each chip.

[0415] Through the above DFE configuration, a circuit for AGC settings of a dual receiver can be designed. The received signal can then be transmitted to the baseband modem as a digital signal.

[0416] <Example 3>

[0417] A third embodiment of the present disclosure may be directed to the structure of a communication system for receiving WUS. As described above, an example of a receiver structure of a base station for receiving WUS is described to save energy at the base station according to one embodiment.

[0418] More specifically, one embodiment proposes a new structure of a base station by considering a radio frequency front-end (RF-FE) part (e.g., including PA / LNA, duplexer, filter, etc.) and a digital front-end (DFE) part (e.g., including functions such as automatic gain control (AGC), DPD, CFR, etc.) of a base station. One embodiment proposes a structure of a transceiver utilizing different antennas when the operating frequency of a WUR is different from the operating frequency of an MR (or, the operating frequency of the WUR is the same or different from the operating frequency of the MR). For example, the MR and the WUR may be operated in the same or different frequency bands, respectively. Through this, a base station including a receiver for receiving a WUS (i.e., a radio unit (RU) or RU+ distributed unit (DU) (RU and DU) or TRP) can be designed.

[0419] FIG. 23 is a diagram illustrating a novel structure of a wireless communication system according to one embodiment of the present disclosure. FIG. 23 may be understood as an example of the structure of a base station or the structure of an RU of a base station according to one embodiment of the present disclosure, but is not limited thereto.

[0420] Referring to FIG. 23, a base station may include a transmitter (Tx, 2302) and a receiver (Rx, 2303) capable of transmitting and receiving channels or signals for synchronization and packet transmission (2301). In addition, a receiver (2305) for a specific wake-up signal to activate or deactivate the base station may be included (2304). In the Tx (2302), the signal path may pass through a CPRI or eCPRI block, a DFE (MR AGC), a DAC (digital analog converter), a LPF, an LO, a PA, a BPF, and a duplexer to reach an antenna. In the Rx (2303), the signal path may pass through an antenna, a duplexer, a BPF, an LNA, an LO, an LPF, an ADC, a DFE, and a CPRI or eCPRI block. In Rx (2305), the signal path may pass through an antenna, a BPF, an LNA, an LO, an LPF, an ADC, a DFE, and a WUS controller (WUR AGC, eCPRI). In addition, at least some of the elements shown in MR (2301) and the elements shown in WUR (2304) may be shared elements rather than separate elements. In addition, there may be multiple antennas here (e.g., an antenna corresponding to Frequency#0, an antenna corresponding to Frequency#1), and switching between antennas may be performed via a switch.

[0421] Figure 23 provides a block diagram illustrating exemplary functions of a transceiver. More specifically, in the structure of a system having dual receivers, a switch may be implemented to share elements performing a specific identical function. In this case, impedance matching and calibration functions for performance degradation due to the switch may be added through a separate feedback circuit for each DFE or switch. More specifically, the receiver structure of the base station described below may be implemented using one or a combination of the following structures.

[0422] [Structure 3-1]

[0423] The dual receiver can share or switch the antenna, which is a passive element. At this time, the dual receiver can select the antenna according to the operating frequency of the WUR (2306). In addition, a switch can be used to switch the frequency antenna according to the switching of the MR and WUR modes, so that the base station can be connected to A or B. When connected to B, the base station can perform operations for receiving a wake-up signal in a low frequency band, and when connected to A, the operations for synchronization and packet transmission and reception can be performed in a high frequency band. Through this, switching can be applied according to the mode and frequency.

[0424] [Structure 3-2]

[0425] Dual receivers can share a band-pass filter (BPF) or a low-pass filter (LPF). More specifically, the band-pass filter or low-pass filter can be designed as an N-th order filter using an amplifier to have gain for signal strength. In this case, depending on the performance requirements required for wake-up signal reception or synchronization and packet transmission / reception operations, the switch can be connected from the middle of the N-th order filter to operate using only the N-th order or a filter with a smaller number of N-th order filters (2307, 2310). This allows the base station to receive the wake-up signal, satisfy the requirements, and process synchronization and packets while using less energy in the filter.

[0426] [Structure 3-3]

[0427] Dual receivers can share low noise amplifiers (LNAs). For example, in a RU (or massive MIMO unit (MMU)) with 8 or 64 LNAs to support 8Tx8Rx or 64Tx64Rx, a receiver that receives only wake-up signals can operate by sharing a smaller number of LNAs for efficient energy saving (2308). This allows the base station to save costs and improve energy efficiency by sharing LNAs.

[0428] [Structure 3-4]

[0429] Dual receivers can share a mixer and local oscillator (LO). When the wake-up signal can be used for down-conversion or direct conversion through the same carrier frequency or the LO of the receiver used for synchronization and packet processing, the mixer and LO can be shared through a switch (2309). On the other hand, in the case of a wake-up signal transmitted through a lower carrier frequency or a non-coherent wake-up signal, a lower-spec LO, such as an LO that only supports a lower frequency or has lower resolution performance, can be used for down-conversion and direct conversion. This can reduce the power consumption of the mixer and LO. In the case of a lower-spec LO, the lower-spec LO can be used regardless of the wake-up signal to save energy.

[0430] [Structure 3-5]

[0431] Dual receivers can share an ADC. The receiver's ADC can be used for synchronization and packet processing to convert analog wake-up signals into digital signals. This allows for the implementation of a receiver that receives wake-up signals without a separate ADC (2311). This reduces the cost and size of the base station.

[0432] As in the above structures, a receiver for receiving a wake-up signal can be implemented by reusing elements used for synchronization and packet processing. That is, a WUR can be implemented by sharing some elements of the receiver of the NR MR as described above. The WUR can include some elements shared with the NR MR.

[0433] At this time, for the non-shared elements (for example, elements applied to the non-shared portion of the MR elements as elements for WUR), BFP, LNA, LO, mixer, LPF, ADC redesigned only for the purpose of receiving the wake-up signal may be utilized. Afterwards, a WUS controller for detecting WUS may be included in the RU according to the design (for example, sequence or format) of the wake-up signal. The WUS controller can confirm the WUS sequence or ID through the correlation of the WUS and determine whether to detect the WUS after the correlation through a comparator. At this time, the RU may be designed with the structure of the first and second embodiments as described above for the connection with the DU. The above-described structure does not limit the scope of the present disclosure to one embodiment, and may be designed as a new receiver (for example, an envelope detector) according to the wake-up signal.

[0434] Furthermore, the dual receiver structure according to the above embodiment can be applied to devices having a transceiver structure, not just base stations. For example, a terminal can expect energy-saving effects through the dual receiver structure. In other words, the dual receiver structure according to the above embodiment can be applied to any device having a transceiver structure.

[0435] In addition, FIG. 23 illustrates an example of a structure in which multiple antennas are replaced / modified in a new structure in a wireless communication system according to an embodiment of the present disclosure described with reference to FIG. 19, but multiple antennas and switching between multiple antennas can also be applied in the new structure in a wireless communication system according to an embodiment of the present disclosure described with reference to FIG. 20 and / or FIG. 21.

[0436] <Example 4>

[0437] According to the fourth embodiment of the present disclosure, a cell selection procedure for energy saving of a base station in a communication system can be provided. Below, a flowchart and block diagram of a terminal and a base station for cell selection and WUS transmission for energy saving of a base station in a communication system are described.

[0438] FIG. 24 is a flowchart illustrating an example of the operation of a terminal applying a cell selection / activation method in a wireless communication system according to an embodiment of the present disclosure. Various modifications may be made to the method illustrated in the flowchart of FIG. 24 . For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0439] Referring to Figure 24, the terminal can perform cell activation through WUS.

[0440] In operation 2401 according to one embodiment, the terminal may perform initial access and / or synchronization based on Cell type 1 (e.g., Cell#0 or Access / Sync cell).

[0441] In operation 2402 according to one embodiment, the terminal may receive configuration information for Cell type 2 (e.g., Cell#1-X or Data cell) from Cell type 1 via upper layer signaling and / or L1 signaling. For example, the configuration information may include configuration information of WUS.

[0442] In operation 2403 according to one embodiment, the terminal may select / determine the transmission power of WUS for WUS transmission based on the above setting information.

[0443] In operation 2404 according to one embodiment, the terminal may transmit the configured WUS to the selected Cell type 2 base station. In addition, the terminal may monitor the WUS feedback during the WUS response window.

[0444] FIG. 25 is a flowchart illustrating an example of the operation of a base station applying a cell selection / activation method in a wireless communication system according to an embodiment of the present disclosure. Various modifications may be made to the method illustrated in the flowchart of FIG. 25 . For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0445] Referring to Figure 25, the base station can perform cell activation through WUS.

[0446] In operation 2501 according to one embodiment, the base station may transmit an RS for initial access and synchronization and / or perform initial access to the terminal based on Cell type 1 (e.g., Cell#0 or Access / Sync cell).

[0447] In operation 2502 according to one embodiment, the base station may transmit configuration information for Cell type 2 (e.g., Cell#1-X or Data cell) to the terminal through upper layer signaling and / or L1 signaling based on Cell type 1. The configuration information may include configuration information for determining WUS transmission power.

[0448] In operation 2503 according to one embodiment, the base station may receive a WUS transmitted from a terminal and determine whether to activate the base station through WUS measurement. For example, whether to activate cell type 2 may be determined.

[0449] In operation 2504 according to one embodiment, the base station that received the WUS can transmit an RS for access after activation (e.g., an RS for cell activation of Cell type 2) during the set WUS response window.

[0450] Although FIG. 25 illustrates an example in which one base station operates in Cell type 1 and Cell type 2, the embodiment is not limited thereto, and each of Cell type 1 and Cell type 2 may be operated in separate base stations. In this case, in the above description, the operation of the base station based on Cell type 1 may be understood as the operation of a Cell type 1 base station, and the operation of the base station based on Cell type 2 may be understood as the operation of a Cell type 2 base station.

[0451] FIG. 26 is a block diagram of a terminal according to one embodiment of the present disclosure.

[0452] Referring to FIG. 26, a terminal (2600) may include a transceiver (2601), a control unit (e.g., a processor) (2602), and a storage unit (e.g., a memory) (2603). The transceiver (2601), the control unit (2602), and the storage unit (2603) of the terminal (2600) may operate according to at least one or a combination of the methods corresponding to the above-described embodiments. However, the components of the terminal (2600) are not limited to the illustrated example. According to other embodiments, the terminal (2600) may include more or fewer components than the components described above. In addition, in certain cases, the transceiver (2601), the control unit (2602), and the storage unit (2603) may be implemented in the form of a single chip.

[0453] The transceiver (2601) may, according to one embodiment, be configured with a transmitter and a receiver. The transceiver (2601) may transmit and receive signals with a base station. The signals may include control information and data. The transceiver (2601) may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts the received signal. The transceiver (2601) may receive a signal through a wireless channel and output the signal to the control unit (2602), and may transmit the signal output from the control unit (2602) through the wireless channel.

[0454] The control unit (2602) may control a series of procedures that the terminal (2600) may perform according to the embodiments of the present disclosure described above. For example, the control unit (2602) may perform or control the operation of the terminal to perform at least one or a combination of methods according to the embodiments of the present disclosure. The control unit (2602) may include at least one processor. For example, the control unit (2602) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer (e.g., an application).

[0455] The storage unit (2603) can store control information (e.g., information related to channel estimation using DMRSs transmitted on PUSCH included in a signal acquired from the terminal (2600)) or data, and can have an area for storing data required for controlling the control unit (2602) and data generated during control by the control unit (2602).

[0456] FIG. 27 is a block diagram of a base station according to one embodiment of the present disclosure.

[0457] Referring to FIG. 27, a base station (2700) may include a transceiver (2701), a control unit (e.g., a processor) (2702), and a storage unit (e.g., a memory) (2703). The transceiver (2701), the control unit (2702), and the storage unit (2703) of the base station (2700) may operate according to at least one or a combination of methods corresponding to the above-described embodiments. However, the components of the base station (2700) are not limited to the illustrated example. According to other embodiments, the base station (2700) may include more or fewer components than the components described above. In addition, in certain cases, the transceiver (2701), the control unit (2702), and the storage unit (2703) may be implemented in the form of a single chip.

[0458] The transceiver (2701) may be configured with a transmitter and a receiver according to one embodiment. The transceiver (2701) may transmit and receive signals with a terminal. The signals may include control information and data. The transceiver (2701) may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts the received signal. The transceiver (2701) may receive a signal through a wireless channel, output the signal to the control unit (2702), and transmit the signal output from the control unit (2702) through the wireless channel. For example, the transceiver of a base station or the RF transceiver of the base station may be configured to include an RU of the base station according to one embodiment of the present disclosure. For more details, refer to the description of the present disclosure.

[0459] The control unit (2702) may control a series of procedures so that the base station (2700) can operate according to the embodiments of the present disclosure described above. For example, the control unit (2702) may perform or control the operation of the base station to perform at least one or a combination of methods according to the embodiments of the present disclosure. The control unit (2702) may include at least one processor. For example, the control unit (2702) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer (e.g., an application).

[0460] The storage unit (2703) can store control information (e.g., information related to channel estimation generated using DMRSs transmitted on a PUSCH determined by the base station (2700), data, control information received from a terminal, or data, and can have an area for storing data required for controlling the control unit (2702) and data generated during control by the control unit (2702).

[0461] 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.

[0462] 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 embodiments described in the claims or specification of the present disclosure.

[0463] 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.

[0464] Additionally, the program may be stored on 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 disclosure 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 disclosure.

[0465] In the specific embodiments of the present disclosure described above, components included in the present disclosure are expressed singularly or plurally, 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 disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0466] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical content of the present disclosure and facilitate understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art to which the present disclosure pertains that other modifications based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments can be combined and operated as needed.

[0467] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0468] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0469] In addition, the method of the present disclosure may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the present disclosure.

[0470] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art to which the present disclosure pertains that other modifications based on the technical concept of the present disclosure are possible. In addition, each of the above embodiments can be combined and operated as needed. For example, all of the embodiments of the present disclosure can be operated by combining parts with each other.

Claims

1. In a method performed by a base station in a communication system, A step of transmitting information related to one or more second cells through a first cell; A step of receiving one or more UL (uplink) WUS (wake up signal) through one or more of the second cells; a step of determining activation of at least one second cell among said one or more second cells; and Comprising a step of performing communication through at least one activated second cell, Activation of at least one of the second cells is performed by a DU (distributed unit) of the base station based on information shared between the RU (radio unit) of the base station and the DU (distributed unit) of the base station, A method wherein the shared information includes information about measurement results for the one or more UL WUS transmitted from the RU of the base station to the DU of the base station.

2. In paragraph 1, The shared information includes information about thresholds associated with measurement results for one or more UL WUS, A method wherein the transmission of information about measurement results for said one or more UL WUS from an RU of said base station to a DU of said base station is based on information about thresholds associated with the measurement results for said one or more UL WUS.

3. In paragraph 1, A method wherein information about a measurement result for the one or more UL WUS is information about reference signal received power (RSRP), signal to interference noise ratio (SINR) or reference signal received quality (RSRQ) for the one or more UL WUS measured by an RU of the base station.

4. In paragraph 1, A method wherein the shared information further includes at least one of one or more WUS IDs (identifiers) corresponding to the one or more UL WUSs or synchronization information between the RU of the base station and the DU of the base station.

5. In paragraph 1, A method wherein initial access is performed through the first cell, and the one or more second cells are set up for data communication.

6. In paragraph 1, The one or more UL WUSs are received using a WUR (wake up receiver) included in an RU of the base station, and the WUR shares some of the components included in an MR (main radio) of the base station. A method wherein an element shared between the MR and the WUR includes a low noise amplifier (LNA), and the LNA is connected to a switch for switching between the MR and the WUR.

7. In the base station of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Transmitting information related to one or more second cells through the first cell; Receiving one or more UL (uplink) WUS (wake up signal) through one or more of the second cells; determining activation of at least one of the second cells among the one or more second cells; and is configured to perform communication through at least one activated second cell; Activation of at least one of the second cells is performed by a DU (distributed unit) of the base station based on information shared between the RU (radio unit) of the base station and the DU (distributed unit) of the base station, A base station, wherein the shared information includes information about measurement results for the one or more UL WUS transmitted from the RU of the base station to the DU of the base station.

8. In paragraph 7, The shared information includes information about thresholds associated with measurement results for one or more UL WUS, A base station, wherein transmission of information about measurement results for said one or more UL WUS from an RU of said base station to a DU of said base station is based on information about thresholds associated with measurement results for said one or more UL WUS.

9. In paragraph 7, Information about the measurement results for the one or more UL WUS is information about reference signal received power (RSRP), signal to interference noise ratio (SINR) or reference signal received quality (RSRQ) for the one or more UL WUS measured by the RU of the base station.

10. In paragraph 7, A base station, wherein the shared information further includes at least one of one or more WUS IDs (identifiers) corresponding to the one or more UL WUSs or synchronization information between the RU of the base station and the DU of the base station.

11. In paragraph 7, A base station wherein initial access is performed through the first cell, and the one or more second cells are set up for data communication.

12. In paragraph 7, The one or more UL WUSs are received using a WUR (wake up receiver) included in an RU of the base station, and the WUR shares some of the components included in an MR (main radio) of the base station. A base station, wherein an element shared between the MR and the WUR includes a low noise amplifier (LNA), and the LNA is connected to a switch for switching between the MR and the WUR.

13. In a method performed by a terminal in a communication system, A step of receiving information related to one or more second cells from a base station through a first cell; A step of transmitting one or more UL (uplink) WUS (wake up signal) to the base station through the one or more second cells; and Comprising a step of performing communication with the base station through at least one activated second cell among the one or more second cells, The at least one activated second cell is based on information shared between a radio unit (RU) of the base station and a distributed unit (DU) of the base station, A method wherein the shared information includes information about measurement results for the one or more UL WUS transmitted from the RU of the base station to the DU of the base station.

14. In paragraph 13, A method wherein initial access is performed through the first cell, and the one or more second cells are set up for data communication.

15. At the terminal of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Through the first cell, receiving information related to one or more second cells from the base station; Transmitting one or more UL (uplink) WUS (wake up signal) to the base station through the one or more second cells; and It is configured to perform communication with the base station through at least one activated second cell among the one or more second cells, The at least one activated second cell is based on information shared between a radio unit (RU) of the base station and a distributed unit (DU) of the base station, A terminal, wherein the shared information includes information on measurement results for one or more UL WUS transmitted from the RU of the base station to the DU of the base station.

Images