Transmission / reception method and device in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method, according to one embodiment of the present disclosure, comprises the steps of: receiving a configuration related to a downlink (DL) reference signal (RS) of a serving cell through higher layer signaling; identifying a plurality of DL RS resources on the basis of the configuration; receiving downlink control information (DCI) including first information related to the muting of one or more DL RS resources among the plurality of DL RS resources; and performing a measurement operation for the serving cell on the basis of the remaining DL RS resources excluding the muted one or more DL RS resources among the plurality of DL RS resources.

Description

Transmission and reception method and device for wireless communication system

[0001] The present disclosure relates to a communication method of a wireless communication system, and more particularly, to a method and device for energy saving in a wireless communication system.

[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), methods are being considered to achieve even faster transmission speeds and even less ultra-low latency compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and meet 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 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 technologies such as the Industrial Internet of Things (IIoT) for intelligent factories 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 is also in progress.

[0006] Additionally, standardization is underway for 5G baseline architectures (e.g., Service-based Architecture, Service-based Interface) for incorporating Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, as well as Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0007] 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).

[0008] In addition, the development of these 5G mobile communication systems can serve as the basis for the development of new waveforms for coverage guarantee 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, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology for improving the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence)-based communication technology that utilizes AI from the design stage and internalizes end-to-end AI support functions to realize system optimization, and next-generation distributed computing technology that realizes services with complexity that exceeds the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources.

[0009] The disclosed embodiment seeks to provide a device and method capable of effectively providing a service in a mobile communication system.

[0010] The technical problems to be achieved in the disclosed embodiments are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from the various embodiments of the present disclosure described below.

[0011] A method performed by a terminal in a communication system according to one embodiment of the present disclosure includes the steps of: receiving, through higher layer signaling, a configuration related to a downlink (DL) reference signal (RS) of a serving cell; identifying a plurality of DL RS resources based on the configuration; receiving downlink control information (DCI) including first information about muting of at least one DL RS resource among the plurality of DL RS resources; and performing a measurement operation for the serving cell based on remaining DL RS resources excluding at least one muted DL RS resource among the plurality of DL RS resources.

[0012] According to one embodiment of the present disclosure, no measurement operation is performed for the one or more muted DL RS resources, or a measurement operation for inter-cell interference is performed.

[0013] According to one embodiment of the present disclosure, second information indicating not to perform a measurement operation for the one or more muted DL RS resources or to perform a measurement operation that performs inter-cell interference is received via the upper layer signaling or is included in the DCI.

[0014] According to one embodiment of the present disclosure, a setting related to the muting capability of at least some of the plurality of DL RS resources is received via the upper layer signaling.

[0015] According to one embodiment of the present disclosure, a mapping relationship between possible values ​​of the first information and one or more DL RS resources among at least some DL RS resources set to be mutable is preset.

[0016] According to one embodiment of the present disclosure, the muted one or more DL RS resources are identified among the at least some DL RS resources based on the value of the first information and the mapping relationship.

[0017] According to one embodiment of the present disclosure, the cyclic redundancy check (CRC) for the DCI is scrambled with a radio network temporary identifier (RNTI) corresponding to a group-common.

[0018] According to one embodiment of the present disclosure, the terminal is included in a terminal-group corresponding to an RNTI corresponding to the group-common.

[0019] According to one embodiment of the present disclosure, a physical downlink control channel (PDCCH) for the DCI is monitored in a common search space (CSS) configured for the terminal group.

[0020] According to one embodiment of the present disclosure, the DCI includes a time domain resource allocation (TDRA) field for time resources for a physical downlink shared channel (PDSCH) and a frequency domain resource allocation (FDRA) field for frequency resources for the PDSCH.

[0021] According to one embodiment of the present disclosure, the PDCCH for the DCI is monitored in a USS (UE-specific search space) configured for the terminal.

[0022] According to one embodiment of the present disclosure, the muting is related to a network energy saving (NES) mode, and third information is received about a transition to the NES mode.

[0023] According to one embodiment of the present disclosure, the time at which the third information is received is: a time at least a first length of time prior to the time at which the third information is switched to the NES mode; or a time at least a second length of time from the time at which the third information is switched to the NES mode, wherein each of the first length of time and the second length of time is related to the processing capability of the terminal.

[0024] According to one embodiment of the present disclosure, the third information includes at least one of muting time information to which the muting is applied, muting frequency information to which the muting is applied, or information on at least one DL RS type to which the muting is applied.

[0025] 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, through higher layer signaling, a configuration related to a downlink (DL) reference signal (RS) of a serving cell; identify a plurality of DL RS resources based on the configuration; receive downlink control information (DCI) including first information about muting of at least one DL RS resource among the plurality of DL RS resources; and perform a measurement operation for the serving cell based on remaining DL RS resources excluding at least one muted DL RS resource among the plurality of DL RS resources.

[0026] According to one embodiment of the present disclosure, no measurement operation is performed for the one or more muted DL RS resources, or a measurement operation for inter-cell interference is performed.

[0027] According to one embodiment of the present disclosure, second information indicating not to perform a measurement operation for the one or more muted DL RS resources or to perform a measurement operation that performs inter-cell interference is received via the upper layer signaling or is included in the DCI.

[0028] According to one embodiment of the present disclosure, a setting related to the muting capability of at least some of the plurality of DL RS resources is received via the upper layer signaling.

[0029] According to one embodiment of the present disclosure, a mapping relationship between possible values ​​of the first information and one or more DL RS resources among at least some DL RS resources set to be mutable is preset.

[0030] According to one embodiment of the present disclosure, the muted one or more DL RS resources are identified among the at least some DL RS resources based on the value of the first information and the mapping relationship.

[0031] According to one embodiment of the present disclosure, the cyclic redundancy check (CRC) for the DCI is scrambled with a radio network temporary identifier (RNTI) corresponding to a group-common.

[0032] According to one embodiment of the present disclosure, the terminal is included in a terminal-group corresponding to an RNTI corresponding to the group-common.

[0033] According to one embodiment of the present disclosure, a physical downlink control channel (PDCCH) for the DCI is monitored in a common search space (CSS) configured for the terminal group.

[0034] According to one embodiment of the present disclosure, the DCI includes a time domain resource allocation (TDRA) field for time resources for a physical downlink shared channel (PDSCH) and a frequency domain resource allocation (FDRA) field for frequency resources for the PDSCH.

[0035] According to one embodiment of the present disclosure, the PDCCH for the DCI is monitored in a USS (UE-specific search space) configured for the terminal.

[0036] According to one embodiment of the present disclosure, the muting is related to a network energy saving (NES) mode, and third information is received about a transition to the NES mode.

[0037] According to one embodiment of the present disclosure, the time at which the third information is received is: a time at least a first length of time prior to the time at which the third information is switched to the NES mode; or a time at least a second length of time from the time at which the third information is switched to the NES mode, wherein each of the first length of time and the second length of time is related to the processing capability of the terminal.

[0038] According to one embodiment of the present disclosure, the third information includes at least one of muting time information to which the muting is applied, muting frequency information to which the muting is applied, or information on at least one DL RS type to which the muting is applied.

[0039] A method performed by a base station in a communication system according to one embodiment of the present disclosure includes the steps of transmitting, through higher layer signaling, a configuration related to a downlink (DL) reference signal (RS), the configuration being related to a plurality of DL RS resources; transmitting downlink control information (DCI) including first information about muting of at least one DL RS resource among the plurality of DL RS resources; and receiving information about a measurement result based on remaining DL RS resources excluding at least one muted DL RS resource among the plurality of DL RS resources.

[0040] 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, through higher layer signaling, a configuration related to a downlink (DL) reference signal (RS), the configuration related to a plurality of DL RS resources; transmit downlink control information (DCI) including first information about muting of at least one DL RS resource among the plurality of DL RS resources; and receive information about a measurement result based on remaining DL RS resources excluding at least one muted DL RS resource among the plurality of DL RS resources.

[0041] The above-described embodiments are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of 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.

[0042] The disclosed embodiment provides a device and method for preventing excessive energy consumption of a base station and achieving high energy efficiency in a mobile communication system.

[0043] The effects that can be obtained from the disclosed embodiments are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0044] FIG. 1 is a diagram showing the basic structure of a time-frequency resource domain of a 5G system according to one embodiment of the present disclosure.

[0045] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0046] FIG. 3 is a diagram illustrating a procedure for a terminal to report terminal capability information to a base station according to one embodiment of the present disclosure.

[0047] FIG. 4 is a diagram illustrating a method for reducing base station energy consumption according to one embodiment of the present disclosure.

[0048] FIG. 5 is a diagram illustrating a method for reducing base station energy consumption according to one embodiment of the present disclosure.

[0049] FIG. 6 is a diagram illustrating a method for reducing base station energy consumption according to one embodiment of the present disclosure.

[0050] FIG. 7 is a diagram illustrating a terminal procedure according to one embodiment of the present disclosure.

[0051] FIG. 8 is a diagram illustrating a base station procedure according to one embodiment of the present disclosure.

[0052] FIG. 9 is a diagram showing a control information configuration according to one embodiment of the present disclosure.

[0053] FIG. 10 is a diagram showing the timing relationship of control information according to one embodiment of the present disclosure.

[0054] FIG. 11 is a diagram showing a terminal transceiver device according to one embodiment of the present disclosure.

[0055] FIG. 12 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0056] FIG. 13 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0057] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. Furthermore, detailed descriptions of related known 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 their functions in 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 overall content of this specification.

[0058] 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 disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0059] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings 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 flowchart 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 flowchart 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).

[0060] 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.

[0061] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. 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.

[0062] In the following description of the present disclosure, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings.

[0063]

[0064] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are provided as examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0065] In the following description, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, while PDSCH (physical downlink shared channel) refers to a physical channel through which data is transmitted, PDSCH may also be used to refer to data. That is, in the present disclosure, the expression "transmitting a physical channel" may be interpreted equivalently to the expression "transmitting data or a signal through a physical channel."

[0066] Hereinafter, in the present disclosure, higher layer signaling refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of the physical layer, or a terminal transmits a signal to a base station using an uplink data channel of the physical layer. Higher layer signaling can be understood as radio resource control (RRC) signaling or a media access control (MAC) control element (CE).

[0067] For convenience of explanation, this disclosure uses terms and names defined in the 3GPP NR (New Radio: 5th generation mobile communications standard) standards. However, this disclosure is not limited to these terms and names, and can be equally applied to systems conforming to other standards.

[0068] Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNodeB, a gNB, an eNodeB, an eNB, a NodeB, 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, an IoT (Internet of Things) device, a sensor, or a multimedia system capable of performing a communication function. Of course, the present invention is not limited to the examples described.

[0069] To handle the explosive growth in mobile data traffic, the initial standards for the 5G (5th Generation) system, or New Radio access technology (NR), the next-generation communication system following LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution), have been completed. While existing mobile communication systems have focused on conventional voice / data communications, the 5G system aims to satisfy various services and requirements, such as enhanced Mobile Broadband (eMBB) services for improving existing voice / data communications, Ultra-Reliable and Low Latency Communication (URLLC) services for high reliability and low latency communications, and massive Machine Type Communication (MTC) services for supporting large-scale machine-to-machine communications.

[0070] While the transmission bandwidth of existing LTE and LTE-A systems per single carrier is limited to a maximum of 20MHz, the 5G system aims to utilize a much wider ultra-wide bandwidth to provide ultra-high-speed data services of up to several Gbps. Accordingly, the 5G system is considering ultra-high frequency bands ranging from several GHz up to 100 GHz as candidate frequencies, where securing ultra-wide bandwidth frequencies is relatively easy. Additionally, wide bandwidth frequencies for the 5G system can be secured through frequency reallocation or allocation among frequency bands ranging from several hundred MHz to several GHz used in existing mobile communication systems.

[0071] Ultra-high frequency radio waves, sometimes called millimeter waves (mmWave), have wavelengths on the order of millimeters. However, in ultra-high frequency bands, path loss increases proportionally to the frequency band, reducing the coverage of mobile communication systems.

[0072] To overcome the drawback of reduced coverage in ultra-high frequency bands, beamforming technology is applied. This technology focuses the radiated energy of radio waves toward a predetermined target point using multiple antennas, thereby increasing the transmission range. Specifically, a signal using beamforming technology has a relatively narrow beamwidth, and the radiated energy is concentrated within this narrowed beamwidth, increasing the transmission range. Beamforming technology can be applied to both the transmitter and receiver. In addition to increasing coverage, beamforming technology also reduces interference in areas outside the beamforming direction. For beamforming technology to function properly, accurate measurement and feedback of the transmission and reception beams are required. Beamforming technology can be applied to control channels or data channels that correspond one-to-one between a given terminal and a base station. Furthermore, beamforming can also be applied to common signals transmitted by a base station to multiple terminals within a system, such as synchronization signals, physical broadcast channels (PBCHs), and control and data channels for transmitting system information, to increase coverage. When applying beamforming technology to a common signal, beam sweeping technology, which transmits a signal by changing the beam direction, is additionally applied so that the common signal can reach terminals located at any location within the cell.

[0073] Another requirement for 5G systems is ultra-low latency services, with transmission delays of approximately 1ms between transmitters and receivers. One way to reduce transmission delay is to design a frame structure based on a short Transmission Time Interval (TTI), which is shorter than that of LTE and LTE-A. A TTI is the basic time unit for scheduling, and the TTI of existing LTE and LTE-A systems is 1ms, corresponding to the length of one subframe. For example, in 5G systems, based on short TTIs to meet the requirements for ultra-low latency services, shorter TTIs of 0.5ms, 0.25ms, and 0.125ms are possible, even shorter than those of existing LTE and LTE-A systems.

[0074] FIG. 1 is a diagram illustrating the basic structure of a time-frequency resource domain of a 5G system according to one embodiment of the present disclosure. That is, FIG. 1 is a diagram illustrating the basic structure of a time-frequency resource domain, which is a radio resource domain through which data or control channels of a 5G system are transmitted.

[0075] Referring to Figure 1, the horizontal axis in Figure 1 represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain of the 5G system is an OFDM (Orthogonal Frequency Division Multiplexing) symbol. (102) symbols are gathered together to form one slot (106), A plurality of slots can be combined to form a subframe (105). The length of one subframe (105) is 1.0 ms, and 10 subframes can be combined to form a 10 ms frame (114). The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth can be composed of a total of NBW (104) subcarriers.

[0076] The basic unit of resources in the time-frequency domain is a Resource Element (RE) (112), which can be represented by an OFDM symbol index and a subcarrier index. A Resource Block (RB or Physical Resource Block, PRB) is a resource block in the frequency domain. It can be defined as (110) consecutive subcarriers. In 5G systems, , and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0077] In a 5G system, a base station can map data in RB units and perform scheduling on RBs, which typically constitute a slot for a given terminal. That is, in a 5G system, the basic time unit for scheduling may be a slot, and the basic frequency unit for scheduling may be an RB.

[0078] Number of OFDM symbols It is determined by the length of the cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, if the normal CP is applied, =14, when Extended CP is applied =12 can be. Extended CP is applied to systems with relatively long transmission distances compared to regular CP, allowing for maintaining orthogonality between symbols. In the case of regular CP, since the ratio of CP length to symbol length is maintained at a constant value, the overhead due to CP can be maintained constant regardless of the subcarrier spacing. That is, if the subcarrier spacing is small, the symbol length becomes longer, and thus the CP length can also become longer. Conversely, if the subcarrier spacing is large, the symbol length becomes shorter, and thus the CP length can be reduced. The symbol length and CP length can be inversely proportional to the subcarrier spacing.

[0079] In 5G systems, various frame structures can be supported by adjusting the subcarrier spacing to meet diverse services and requirements. For example,

[0080] - From the perspective of the operating frequency band, the larger the subcarrier spacing, the more advantageous it is for recovering phase noise in the high-frequency band.

[0081] - From the perspective of transmission time, if the subcarrier spacing is large, the symbol length in the time domain becomes shorter, and consequently, the slot length becomes shorter, which is advantageous for supporting ultra-low delay services such as URLLC.

[0082] - From a cell size perspective, a longer CP length allows for larger cells to be supported, so a smaller subcarrier spacing allows for relatively larger cells to be supported. In mobile communications, a cell is a concept that refers to the area covered by a single base station.

[0083] Subcarrier spacing, CP length, etc. are essential information for OFDM transmission and reception. Smooth transmission and reception are possible only when the base station and terminal recognize the subcarrier spacing, CP length, etc. as common values. [Table 1] shows the relationship between the subcarrier spacing configuration (μ), subcarrier spacing (?f), and CP length supported by the 5G system.

[0084] [Table 1]

[0085]

[0086] [Table 2] shows the number of symbols per slot for each subcarrier spacing setting (μ) in the case of the general CP. ), number of slots per frame ( ), number of slots per subframe ( ) is indicated.

[0087] [Table 2]

[0088]

[0089] [Table 3] shows the number of symbols per slot for each subcarrier spacing setting (μ) in the case of extended CP. ), number of slots per frame ( ), number of slots per subframe ( ) is indicated.

[0090] [Table 3]

[0091]

[0092] In the early stages of 5G system deployment, coexistence or dual-mode operation with existing LTE and / or LTE-A (hereinafter referred to as LTE / LTE-A) systems is expected. This allows existing LTE / LTE-A systems to provide stable system operation to terminals, while the 5G system can provide enhanced services to terminals. Therefore, the 5G system's frame structure must at least include the LTE / LTE-A frame structure or essential parameter set (subcarrier spacing = 15 kHz).

[0093] For example, comparing a frame structure with a subcarrier spacing setting μ=0 (hereinafter referred to as frame structure A) and a frame structure with a subcarrier spacing setting μ=1 (hereinafter referred to as frame structure B), compared to frame structure A, frame structure B shows that the subcarrier spacing and RB size are twice as large, and the slot length and symbol length are twice as small. In the case of frame structure B, two slots can constitute one subframe, and 20 subframes can constitute one frame.

[0094] Generalizing the frame structure of a 5G system provides high scalability by ensuring that essential parameters—subcarrier spacing, CP length, and slot length—have integer multiple relationships for each frame structure. Furthermore, a fixed-length subframe of 1 ms can be defined to represent a reference time unit independent of the frame structure.

[0095] The frame structure of the 5G system can be applied to various scenarios. From a cell size perspective, a longer CP length can support larger cells, so frame structure A can support relatively larger cells than frame structure B. From an operating frequency band perspective, a larger subcarrier spacing is advantageous for phase noise recovery in high-frequency bands, so frame structure B can support relatively higher operating frequencies than frame structure A. From a service perspective, a shorter slot length, which is the basic time unit for scheduling, is advantageous for supporting ultra-low latency services such as URLLC, so frame structure B can be relatively more suitable for URLLC services than frame structure A.

[0096] In the following description of the present disclosure, uplink (UL) may refer to a wireless link through which a terminal transmits data or a control signal to a base station, and downlink (DL) may refer to a wireless link through which a base station transmits data or a control signal to a terminal.

[0097] In the initial access phase, when a terminal first accesses the system, the terminal can synchronize downlink time and frequency from a synchronization signal transmitted by a base station through cell search, and obtain a cell identifier (cell ID). Then, the terminal can receive a Physical Broadcast Channel (PBCH) using the obtained cell ID, and obtain a Master Information Block (MIB), which is essential system information, from the PBCH. 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.

[0098] The synchronization signal serves as a reference for cell search, and subcarrier spacing can be applied to suit channel conditions such as phase noise for each frequency band. For data channels or control channels, as described above, different subcarrier spacings can be applied depending on the service type to support various services.

[0099] After the terminal acquires MIB and system information from the base station through the initial access procedure, the terminal can perform a random access procedure to transition the link with the base station to the connected state (or RRC_CONNECTED state). Upon completion of the random access procedure, the terminal transitions to the connected state, enabling one-to-one communication between the base station and the terminal. The random access procedure is described in detail below with reference to FIG. 2.

[0100] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0101] Referring to FIG. 2, in the first step (210) of the random access procedure, the terminal transmits a random access preamble to the base station. The random access preamble, which is the first transmission message of the terminal in the random access procedure, may be referred to as message 1. The base station can measure the transmission delay value between the terminal and the base station from the random access preamble and synchronize the uplink. At this time, the terminal can arbitrarily select which random access preamble to use within the random access preamble set given in advance by system information. In addition, the initial transmission power of the random access preamble can be determined according to the path loss between the terminal and the base station measured by the terminal. In addition, the terminal can determine the transmission beam direction of the random access preamble from the synchronization signal received from the base station and transmit the random access preamble.

[0102] In the second step (220), the base station transmits an uplink transmission timing adjustment command to the terminal based on the transmission delay value measured from the random access preamble received in the first step (210). Additionally, the base station may transmit uplink resources and power control commands to be used by the terminal as scheduling information. The scheduling information may include control information regarding the terminal's uplink transmission beam.

[0103] If the terminal does not receive the Random Access Response (RAR) (or message 2), which is scheduling information for message 3, from the base station within a predetermined time in the second step (220), the first step (210) can be performed again. If the first step (210) is performed again, the terminal can increase the probability of the base station receiving the random access preamble by transmitting it while increasing the transmission power of the random access preamble by a predetermined step (power ramping).

[0104] In the third step (230), the terminal transmits uplink data (message 3) including its terminal ID to the base station through an uplink data channel (Physical Uplink Shared Channel, PUSCH) using the uplink resources allocated in the second step (220). The transmission timing of the uplink data channel for transmitting Message 3 may follow the timing control command received from the base station in the second step (220). In addition, the transmission power of the uplink data channel for transmitting Message 3 may be determined by considering the power control command received from the base station in the second step (220) and the power ramping value of the random access preamble. The uplink data channel for transmitting Message 3 may mean the first uplink data signal that the terminal transmits to the base station after transmitting the random access preamble.

[0105] In step 4 (240), if the base station determines that the terminal has performed random access without collision with other terminals, it transmits data (message 4) including the ID of the terminal that transmitted uplink data in step 3 (230) to the terminal. If the terminal receives the signal transmitted by the base station in step 4 (240) from the base station, it can determine that the random access has been successful. In addition, the terminal can transmit HARQ-ACK (hybrid automatic and repeat request-acknowledgement) information indicating whether message 4 was successfully received to the base station through an uplink control channel (Physical Uplink Control Channel, PUCCH).

[0106] If the data transmitted by the terminal in step 3 (230) collides with data from another terminal, causing the base station to fail to receive a data signal from the terminal, the base station may not transmit any more data to the terminal. Accordingly, if the terminal fails to receive the data transmitted from the base station in step 4 (240) within a certain period of time, it may determine that the random access procedure has failed and restart from step 1 (210).

[0107] Upon successful completion of the random access procedure, the terminal transitions to the connected state, enabling one-to-one communication between the base station and the terminal. The base station receives UE capability information from the connected terminal and can adjust scheduling based on the UE capability information. Through UE capability information, the terminal can inform the base station whether it supports a given function and the maximum allowable value of the function supported by the terminal. Therefore, the UE capability information reported by each terminal to the base station may have different values ​​for each terminal.

[0108] For example, a terminal may report UE capability information including at least a portion of the following control information to a base station as UE capability information.

[0109] - Control information related to frequency bands supported by the terminal

[0110] - Control information related to channel bandwidth supported by the terminal

[0111] - Control information related to the maximum modulation method supported by the terminal

[0112] - Control information related to the maximum number of beams supported by the terminal

[0113] - Control information related to the maximum number of layers supported by the terminal

[0114] - Control information related to CSI reporting supported by the terminal

[0115] - Control information on whether the terminal supports frequency hopping

[0116] - Bandwidth-related control information when supporting carrier aggregation (CA)

[0117] - Control information on whether cross carrier scheduling is supported when carrier aggregation is supported.

[0118] FIG. 3 is a diagram illustrating a procedure for a terminal to report terminal capability information to a base station according to one embodiment of the present disclosure.

[0119] Referring to FIG. 3, at step 310, the base station (302) can transmit a UE capability information request message to the terminal (301). In response to the base station's request for UE capability information, the terminal transmits UE capability information to the base station at step 320.

[0120] Next, we will specifically explain downlink control information (DCI) in the 5G system.

[0121] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) can be transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields predefined between the base station and the terminal, and the non-fallback DCI format can include configurable fields.

[0122] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after going through the channel coding and modulation process. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process. When the UE receives a DCI message transmitted on the PDCCH, it verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can know that the message was transmitted to the UE.

[0123] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a Paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0124] The base station can operate by applying a predetermined DCI format depending on whether the DCI is scheduling information for downlink data (downlink assignment) for the terminal to be scheduled, scheduling information for uplink data (uplink grant), or DCI for purposes other than data scheduling, such as power control.

[0125] The base station can transmit downlink data to the terminal via the Physical Downlink Shared Channel (PDSCH), a physical channel for downlink data transmission. Scheduling information, such as the specific mapping location in the time and frequency domains of the PDSCH, modulation scheme, HARQ-related control information, and power control information, can be communicated to the terminal by the base station via DCI related to downlink data scheduling information among the DCI transmitted via the PDCCH.

[0126] A terminal can transmit uplink data to a base station via the Physical Uplink Shared Channel (PUSCH), a physical channel for uplink data transmission. Scheduling information, such as specific mapping locations in the time and frequency domains of the PUSCH, modulation schemes, HARQ-related control information, and power control information, can be provided to the terminal by the base station via DCI related to uplink data scheduling information, among the DCIs transmitted via the PDCCH.

[0127] The time-frequency resources to which the PDCCH is mapped are called a Control Resource Set (CORESET). A CORESET can be configured for all or part of the frequency resources of the bandwidth supported by the terminal in the frequency domain. In the time domain, it can be configured with one or more OFDM symbols, which can be defined as the CORESET length (Control Resource Set Duration). The base station can configure one or more CORESETs to the terminal through higher layer signaling (e.g., System Information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Configuring a CORESET to the terminal may mean providing information such as a CORESET identifier (Identity), the frequency location of the CORESET, and the symbol length of the CORESET. The information that the base station provides to the terminal to configure the CORESET may include at least some of the information included in .

[0128] [Table 4]

[0129]

[0130]

[0131]

[0132] CORESET is in the frequency domain It can be composed of RBs and in the time domain It can be composed of symbols. The PDCCH can be composed of one or more Control Channel Elements (CCEs). One CCE can be composed of six Resource Element Groups (REGs), and a REG can be defined as one RB during one OFDM symbol. Within one CORESET, REGs can be indexed in time-first order, starting with REG index 0 from the first OFDM symbol of the CORESET, the lowest RB.

[0133] Interleaved and non-interleaved transmission methods for PDCCH can be supported. The base station can configure whether to use interleaved or non-interleaved transmission for each CORESET to the terminal through upper layer signaling. Interleaving can be performed in units of REG bundles. A REG bundle can be defined as a set of one or more REGs. The terminal can determine the CCE-to-REG mapping method in the corresponding CORESET based on whether to use interleaved or non-interleaved transmission as configured by the base station, as shown in below.

[0134] [Table 5]

[0135]

[0136] The base station can inform the terminal of configuration information such as which symbol within the slot the PDCCH is mapped to and the transmission cycle through signaling.

[0137] The search space of the PDCCH is described as follows. The number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs can be used for link adaptation of the downlink control channel. For example, when AL=L, a single downlink control channel can be transmitted through L CCEs. The UE performs blind decoding, which detects a signal without knowing information about the downlink control channel, and for this purpose, a search space representing a set of CCEs can be defined. The search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode at a given aggregation level. Since there are various aggregation levels that create a single group with 1, 2, 4, 8, or 16 CCEs, the UE can have multiple search spaces. A search space set can be defined as the set of search spaces at all established aggregation levels.

[0138] Search spaces can be categorized into a common search space (CSS) and a UE-specific search space (USS). A certain group of UEs, or all UEs, can scan the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling for the System Information Block (SIB) or paging messages. For example, a UE can receive scheduling allocation information for the PDSCH for system information reception by scanning the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. UE-specific scheduling allocation information for the PDSCH or PUSCH can be received by scanning the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's identity (ID) and various system parameters.

[0139] The base station can set the search space configuration information of the PDCCH to the terminal through higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can set the number of PDCCH candidates in each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of the DCI format and RNTI to be monitored in the corresponding search space, the CORESET index to be monitored for the search space, etc. to the terminal. For example, the parameters for the search space for the PDCCH may include information such as the following .

[0140] [Table 6]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147] Depending on the configuration information, the base station may configure one or more search space sets for the terminal. In some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal. In search space set 1, the terminal may be configured to monitor DCI format A scrambled with X-RNTI in a common search space, and in search space set 2, the terminal may be configured to monitor DCI format B scrambled with Y-RNTI in a terminal-specific search space.

[0148] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0149] In a common search space, a terminal can monitor the following combinations of DCI formats and RNTIs, although these are not limited to the following examples.

[0150] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0151] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0152] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0153] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0154] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0155] In a terminal-specific search space, a terminal can monitor the following combinations of DCI formats and RNTIs, although these are not limited to the following examples.

[0156] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0157] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0158] RNTIs may follow the following definitions and uses:

[0159] C-RNTI (Cell RNTI): For terminal-specific PDSCH or PUSCH scheduling purposes.

[0160] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0161] CS-RNTI (Configured Scheduling RNTI): Used for semi-static terminal-specific PDSCH scheduling.

[0162] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0163] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0164] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0165] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is punctured.

[0166] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0167] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0168] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0169] The DCI formats described above can follow the definitions shown in below.

[0170] [Table 7]

[0171]

[0172] CORESET p, the search space of aggregation level L in the search space set s can be expressed as the following mathematical formula.

[0173] [Mathematical Formula 1]

[0174]

[0175] - L: Integration level

[0176] - n CI : Carrier Index

[0177] - N CCE,p : Total number of CCEs existing within the control resource set p

[0178] - n μ s,f : slot index

[0179] - M (L) p,s,max : Number of PDCCH candidates for aggregation level L

[0180] - m snCI = 0,..., M (L) p,s,max -1: PDCCH candidate index of aggregation level L

[0181] - i = 0,..., L-1

[0182] -

[0183] - n RNTI : Terminal identifier

[0184] The value can be 0 for a common search space.

[0185] In the case of a terminal-specific search space, the value may correspond to a value that changes according to the terminal's ID (C-RNTI or ID set to the terminal by the base station) and time index.

[0186] Below, a method for measuring and reporting channel conditions in a 5G communication system is described in detail.

[0187] Channel state information (CSI) may include the following information:

[0188] - Channel Quality Indicator (CQI): CQI index indication information consisting of a modulation method and coding rate that satisfies the minimum reception error rate of a predefined PDSCH.

[0189] - Precoding Matrix Indicator (PMI): Precoding matrix indicator information selected by the terminal.

[0190] - CRI (CSI-RS resource indicator): CSI-RS information measured by the terminal

[0191] - RI (Rank Indicator): Rank indication information selected by the terminal

[0192] - LI (Layer indicator): Indication information for the best layer among the precoding matrices reported by the terminal.

[0193] - SSBRI (SS / PBCH block resource indicator): SSB information measured by the terminal

[0194] - L1-RSRP (Reference Signal Received Power): L1 RSRP information measured by the terminal

[0195] The base station can control time and frequency resources for the aforementioned CSI measurement and reporting of the terminal.

[0196] For CSI measurement and reporting operations, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, and the base station can set which method to use to the terminal through signaling. The semi-persistent CSI reporting method supports 'PUCCH-based semi-persistent (semi-PersistentOnPUCCH)' and 'PUSCH-based semi-persistent (semi-PersistentOnPUSCH)'. In the case of periodic or semi-persistent CSI reporting methods, the terminal can receive PUCCH or PUSCH resources to transmit CSI from the base station through upper layer signaling. The period and slot offset of the PUCCH or PUSCH resources to transmit CSI can be given by setting the subcarrier spacing of the uplink (UL) bandwidth part where the CSI report is set to be transmitted. In the case of the aperiodic CSI reporting method, the terminal can schedule PUSCH resources for transmitting CSI from the base station through L1 signaling (DCI format 0_1 ​​described above).

[0197] Aperiodic CSI reporting of a terminal can use PUSCH, periodic CSI reporting can use PUCCH, and semi-persistent CSI reporting can be performed using PUSCH when triggered or activated by DCI, or PUCCH after being activated by MAC control element (MAC CE).

[0198] Aperiodic CSI reporting can be triggered by the “CSI request” field of the aforementioned DCI format 0_1 ​​corresponding to scheduling DCI for PUSCH.

[0199] To support ultra-high-speed data services, data rates can be increased through spatial multiplexing using multiple transmit / receive antennas. Typically, the number of power amplifiers (PAs) required increases proportionally to the number of transmit antennas installed at a base station or terminal. The maximum output of the base station and terminal is determined by the characteristics of the PA, and the maximum output of the base station generally varies depending on the cell size covered by the base station. The maximum output is usually expressed in dBm. The maximum output of the terminal is typically 23 dBm or 26 dBm.

[0200] As an example, a commercial 5G base station can operate at a 3.5 GHz frequency band, equipped with 64 transmit antennas and corresponding 64 power amplifiers, with a bandwidth of 100 MHz. Ultimately, the energy consumption of the base station increases in proportion to the power amplifier output and operating time. Compared to LTE base stations, 5G base stations have a relatively high operating frequency band, allowing for a wider bandwidth and a larger number of transmit antennas. While these characteristics directly increase data rates, they come at the cost of increased base station energy consumption. Therefore, the more base stations that comprise a mobile communications network, the greater the energy consumption of the entire mobile communications network.

[0201] As mentioned above, the energy consumption of a base station is largely determined by the operation of the power amplifier. Since the power amplifier is involved in the base station's transmission operation, the downlink (DL) transmission operation of the base station is closely related to its energy consumption. Comparatively, the uplink (UL) reception operation of the base station does not account for a significant portion of its energy consumption. The physical channels and physical signals transmitted by the base station in the downlink are as follows.

[0202] - PDSCH (Physical Downlink Shared Channel): A downlink data channel containing data to be transmitted to one or more terminals.

[0203] - PDCCH (Physical Downlink Control Channel): A downlink control channel that contains scheduling information for the PDSCH and PUSCH (Physical Uplink Control Channel). Alternatively, the PDCCH alone can transmit control information such as slot format and power control commands without the PDSCH or PUSCH to be scheduled. Scheduling information includes resource information to which the PDSCH or PUSCH is mapped, HARQ-related information, power control information, etc.

[0204] - PBCH (Physical Broadcast Channel): A downlink broadcast channel that provides MIB (Master Information Block), which is essential system information required for transmission and reception of data channels and control channels of the terminal.

[0205] - PSS (Primary Synchronization Signal): This signal serves as the basis for DL ​​time / frequency synchronization and provides some cell ID information.

[0206] - SSS (Secondary Synchronization Signal): A signal that serves as a basis for DL ​​time and / or frequency (hereinafter referred to as time / frequency) synchronization and provides some remaining information such as cell ID.

[0207] - DM-RS (Demodulation Reference Signal): Reference signal for terminal channel estimation for each of PDSCH, PDCCH, and PBCH.

[0208] - CSI-RS (Channel-state Information Reference Signal): A downlink signal that serves as a basis for measuring the terminal's downlink channel status.

[0209] - PT-RS (Phase-tracking Reference Signal): Downlink signal for phase tracking

[0210] From a base station energy conservation perspective, suspending downlink transmission at the base station can significantly reduce base station energy consumption by halting power amplifier operation. Furthermore, the reduced operation of other base station components, including the baseband, in addition to the power amplifier can also lead to additional energy savings. Similarly, even though uplink reception accounts for a relatively small portion of the base station's overall energy consumption, suspending uplink reception can yield additional energy savings.

[0211] The downlink transmission behavior of a base station is fundamentally determined by the amount of downlink traffic. For example, if there is no data to transmit to a terminal via the downlink, the base station does not need to transmit the PDSCH and the PDCCH for scheduling the PDSCH. Alternatively, if transmission can be temporarily delayed for reasons such as the data being insensitive to transmission delay, the base station may not transmit the PDSCH and / or PDCCH. For convenience of explanation below, this method of reducing base station energy consumption by not transmitting or appropriately controlling PDSCH and / or PDCCH transmission associated with data traffic is referred to as "Base Station Energy Saving Method 1-1."

[0212] In contrast, physical channels and physical signals such as PSS, SSS, PBCH, and CSI-RS have the characteristic of being repeatedly transmitted at a predetermined, promised cycle regardless of data transmission to the terminal. Therefore, even if the terminal does not receive data, it can continuously update downlink time / frequency synchronization, downlink channel status, radio link quality, etc. In other words, PSS, SSS, PBCH, and CSI-RS necessarily require downlink transmission regardless of downlink data traffic, and thus induce base station energy consumption. Therefore, base station energy can be saved by adjusting the transmission of signals unrelated to (or with low relevance to) data traffic to occur less frequently (hereinafter referred to as 'base station energy saving method 1-2').

[0213] By using 'Base Station Energy Saving Method 1-1' or 'Base Station Energy Saving Method 1-2', the energy saving effect of the base station can be maximized by stopping or minimizing the operation of the base station's power amplifier and related RF (radio frequency) devices, baseband devices, etc. during the time period when the base station does not perform downlink transmission.

[0214] Alternatively, the energy consumption of the base station can be reduced by switching off some of the base station antennas or power amplifiers (hereinafter referred to as 'Base Station Energy Saving Method 2'). In this case, the energy saving effect of the base station may be counterproductive, such as a decrease in cell coverage or a decrease in throughput. For example, there may be a base station equipped with 64 transmit antennas and corresponding 64 power amplifiers in the 3.5 GHz frequency band described above and operating with a bandwidth of 100 MHz. In order to save energy for such a base station, if only 4 transmit antennas and 4 power amplifiers are activated for a certain period of time and the rest are switched off, the base station energy consumption during that period is reduced to approximately 1 / 16 (= 4 / 64). When only four transmit antennas and four power amplifiers are activated for a given time period and the rest are switched off, it becomes difficult to achieve the cell coverage and throughput assuming the existing 64 antennas and power amplifiers due to the decrease in maximum transmit power and beamforming gain.

[0215] The above-described base station energy saving methods 1-1, 1-2, and 2 can be applied and operated individually, or can be operated in combination with each other.

[0216] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The various embodiments of the present disclosure below may be applied independently, or one or more embodiments may be applied simultaneously or in combination. That is, one or more of the various embodiments of the present disclosure may be used in combination with each other.

[0217] 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.

[0218] 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.

[0219] In the following description of 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.

[0220] - MIB (Master Information Block)

[0221] - SIB (System Information Block) or SIB

[0222] - RRC (Radio Resource Control)

[0223] - MAC (Medium Access Control) CE (Control Element)

[0224] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the physical layer channel or signaling below.

[0225] - PDCCH (Physical Downlink Control Channel)

[0226] - DCI (Downlink Control Information)

[0227] - UE-specific DCI

[0228] - Group common DCI

[0229] - Common DCI

[0230] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0231] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0232] - PUCCH (Physical Uplink Control Channel)

[0233] - UCI (Uplink Control Information)

[0234] In the present disclosure, determining the priority between A and B can be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority.

[0235] In the description of the present disclosure, a / b means at least one of a or b.

[0236] In the following description, the base station mode that applies an operation for saving base station energy is called the base station power saving mode (ES mode) to distinguish it from the general base station operation, and the base station mode that applies the general base station operation is called the base station normal mode (Normal mode).

[0237] FIG. 4 is a diagram illustrating a method for reducing base station energy consumption according to one embodiment of the present disclosure.

[0238] FIG. 5 is a diagram illustrating a method for reducing base station energy consumption according to one embodiment of the present disclosure.

[0239] FIG. 6 is a diagram illustrating a method for reducing base station energy consumption according to one embodiment of the present disclosure.

[0240] When the base station applies the energy consumption reduction method as described above, the outline of the base station and terminal operations is described below with reference to FIGS. 4, 5, and 6.

[0241] Fig. 4 shows an example of mapping data or control information that a base station wants to transmit to a terminal in the time-frequency resource domain. In the example of Fig. 4, the time-domain mapping units indicated by T1 to T7 can be slots, slot bundles which are a collection of multiple slots, symbols, etc. The frequency-domain mapping units indicated by F1 to F5 can be RBs (resource blocks), RBGs (RB groups), REs (resource elements), etc. For the convenience of the following explanation, it is assumed that the mapping unit in the time domain is a slot and the mapping unit in the frequency domain is an RB.

[0242] In the example of Fig. 4, the base station transmits data or control information by allocating time-frequency domains of reference numbers 410, 420, 440, 450, and 460 to terminals within the cell, respectively. At this time, since no transmission occurs during the time periods T2 and T4, the base station can turn off the power amplifier during the corresponding time periods according to the 'base station energy saving method 2', thereby reducing base station energy consumption.

[0243] FIG. 5 illustrates a case where, under a similar assumption to FIG. 4, the base station additionally moves data or control information that it intended to schedule in the T1, T3 time intervals to the T6, T7 time intervals and schedules them with reference numbers 510, 520. Accordingly, the base station can secure the T1, T2, T3, and T4 time intervals and obtain an energy consumption reduction effect through power amplifier switch-off. This can be defined as a combined operation of the above-described 'Base Station Energy Reduction Method 1-1' and 'Base Station Energy Reduction Method 2'. However, in this case, the transmission delay may increase as a trade-off for the reduction in base station energy consumption. Therefore, it may be suitable for a traffic situation that is not sensitive to transmission delay or a case where the amount of traffic that the base station must process is not large.

[0244] FIG. 6 illustrates a case where, under a similar assumption to FIG. 4 or FIG. 5, RS (reference signal) is additionally preset to be transmitted to the terminal during time periods T1 to T7 (601, 602, 603, 604, 605, 606, 607). The RS may be SSB, CSI-RS, etc. If the base station prioritizes reducing base station energy consumption, RS transmission can be stopped during the time periods T2 and T4 when there is no data transmission, thereby reducing energy consumption through power amplifier switch-off.

[0245] In this case, if no separate action is taken, the terminal attempts to receive RS from the base station as preset during the T2 and T4 time intervals, but actual RS transmission is not performed. This not only causes unnecessary terminal operation, but may also weaken the accuracy of channel state measurement, radio link quality measurement, etc. of the terminal based on the RS. For the convenience of the following explanation, the operation in which the base station stops transmitting RS to the terminal differently from the preset is referred to as 'RS muting'.

[0246] The following describes the operation of the base station and the terminal in the base station energy consumption saving mode through specific examples.

[0247] <Example 1>

[0248] The first embodiment describes the operation of a base station and a terminal when the base station executes the above-described 'RS muting' to reduce base station energy consumption.

[0249] As described in the example of FIG. 6 above, the base station may suspend the promised RS transmission at time intervals T2 and T4 (601, 602) and execute 'RS muting'. In this case, the base station may notify the terminal that 'RS muting' has been executed, and may define the following terminal actions in response.

[0250] Terminal Action 1: The terminal does not perform a measurement operation on the 'RS muted' radio resources. That is, since there is no RS to measure from the terminal's perspective, unnecessary terminal operations can be avoided and unnecessary terminal power consumption can be prevented. If the terminal needs to perform the measurement operation during a predetermined observation time period, the terminal performs the measurement operation excluding the time period of the 'RS muted' radio resources. For example, if the terminal performs RS measurement during the observation time period from T1 to T7 in order to measure the radio link quality with the base station, the terminal performs the radio link quality measurement based on the RS measurement values ​​of T1, T3, T5, T6, and T7 excluding the 'RS muted' time periods T2 and T4.

[0251] Terminal Action 2: The terminal performs a measurement operation on a radio resource that has been 'RS muted'. However, in this case, it is assumed that the RS of the serving cell has stopped transmitting on the radio resource, but the RS of the neighbor cell is transmitted. Therefore, the terminal can measure interference from the neighbor cell through the measurement operation on the radio resource. That is, the measurement values ​​measured by the terminal on the radio resource that has been 'RS muted' and the measurement values ​​measured on the radio resource that has not been 'RS muted' have different characteristics, and therefore cannot be mixed with each other. For example, the values ​​measured by the terminal during the time intervals T2 and T4 that have been 'RS muted' represent the intensity of interference that the neighbor cell affects the serving cell, and the RS measured during T1, T3, T5, T6, and T7, excluding the time intervals T2 and T4, represent the radio link quality measurement values ​​of the serving cell.

[0252] FIG. 7 is a diagram illustrating a terminal procedure according to one embodiment of the present disclosure. FIG. 7 illustrates a terminal procedure according to the first embodiment. Various modifications may be made to the method illustrated in the flowchart of FIG. 7. For example, although illustrated as a series of steps, the various steps in each diagram 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.

[0253] In step 710, the terminal receives an indicator from the base station indicating that 'RS muting' has occurred on a given radio resource. The indicator may be signaled to the terminal in various formats, such as RRC signaling, MAC control element signaling, physical layer signaling, or a combination of two or more signaling methods.

[0254] A terminal that has acquired the 'RS muting' indicator performs a measurement operation according to the 'RS muting' indicator in step 720. The measurement operation follows the 'Terminal Operation 1' or 'Terminal Operation 2' described above. Which measurement operation to perform can be defined in advance or included in the 'RS muting' indicator. The terminal reports the measurement result to the base station at a pre-arranged time or at a time indicated by the base station.

[0255] Although not included in the example of FIG. 7, a procedure for reporting UE capability information indicating whether the terminal supports the 'RS muting' related operation to the base station can be added before step 710.

[0256] FIG. 8 is a diagram illustrating a base station procedure according to one embodiment of the present disclosure. FIG. 8 illustrates a base station procedure according to the first embodiment. Various modifications may be made to the method illustrated in the flowchart of FIG. 8. For example, although illustrated as a series of steps, the various steps in each diagram 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.

[0257] In step 810, the base station transmits an indicator to the terminal indicating that 'RS muting' has occurred. In step 820, the base station can receive a terminal measurement report from the terminal. The base station processes the measurement values ​​reported by the terminal according to the terminal action corresponding to the 'RS muting' indicator. The base station performs scheduling for the terminal by referring to the terminal's measurement report.

[0258] <Example 2>

[0259] The second embodiment describes a method in which a base station uses UE group common DCI to inform a terminal of the 'RS muting' performed by the base station in order to reduce base station energy consumption.

[0260] Terminal group common DCI reduces downlink signaling overhead by allowing the base station to provide control information for multiple terminals in a single DCI. Terminal group common DCI, which indicates whether the base station is executing "RS muting," can be configured with control information in the following manner.

[0261] The base station can preset RSs to which 'RS muting' is applied, and indicate that 'RS muting' has been executed for the corresponding RSs through an 'RS muting' indicator consisting of N bits. For example, the base station can preset K RSs as RSs to which 'RS muting' is applied. The 'RS muting' preset includes detailed information such as the time-frequency resource mapping position of the corresponding RSs. In this case, the 'RS muting' indicator can be represented by ceiling (log2 (K+1)) bits. If K = 3, the 'RS muting' indicator consists of 2 bits (=ceiling (log2(3+1))) and can represent the following meaning in .

[0262] [Table 8]

[0263]

[0264] As a modified example of the above , it is possible for two or more RSs to be 'RS muted'. In this case, a mapping with an 'RS muting' indicator that specifically indicates which RSs have been 'RS muted' is preset, and the bit size of the 'RS muting' indicator for indicating the corresponding information may also increase compared to the case of the above .

[0265] FIG. 9 is a diagram showing a control information configuration according to one embodiment of the present disclosure.

[0266] Referring to FIG. 9, the base station attaches a CRC (Cyclic Redundancy Check) for error detection (901) to the control information configured in the above manner, and then scrambles it with a group RNTI (Radio Network Temporary Identifier) ​​corresponding to the identity of the terminal group (903).

[0267] Terminals belonging to the same terminal group are assigned a common group RNTI in advance. The group RNTI is not transmitted explicitly, but is included in the CRC calculation process. The group RNTI is not transmitted directly in the control information, but is reflected by scrambling the CRC of the control information. The cell RNTI, which is commonly applied to all terminals in a cell, can be viewed as a special case of the group RNTI, and can be applied similarly to the second embodiment. When a DCI message transmitted on the PDCCH is received, the terminal verifies the CRC using the assigned group RNTI. If the CRC verification result is correct, the terminal can know that the message has been transmitted to the terminal. The terminal performs related actions according to the 'RS muting' indicator indicated in the acquired DCI message.

[0268] The PDCCH carrying the group common DCI may be mapped to and transmitted in a common search space (CSS). In the case of the common search space, since a certain group of terminals or all terminals must receive the PDCCH, it may be defined as a set of pre-arranged CCEs. Terminals belonging to the same group may acquire the group common DCI by examining the common search space of the PDCCH. The base station may notify the terminal or terminal group of configuration information regarding the common search space in advance through signaling.

[0269] <Example 3>

[0270] The third embodiment describes a method in which a base station uses DCI for scheduling to inform a terminal of the 'RS muting' performed by the base station in order to reduce base station energy consumption.

[0271] The above DCI may be scheduling control information for the PDSCH that the base station wishes to transmit to the terminal. The base station may configure DCI that includes the 'RS muting' indicator as scheduling control information for the PDSCH, then scramble it with the RNTI for the terminal to which it wishes to transmit, and transmit it to the terminal via the PDCCH. Accordingly, the DCI of the third embodiment includes at least the following control information.

[0272] - 'RS muting' indicator: The base station can use the 'RS muting' indicator to inform the terminal whether RS ​​muting is performed for a preset RS. For a specific example, the description of the second embodiment can be applied.

[0273] - 'Time Domain Resource Allocation Information' (TDRA): The base station can set up a table for time domain resource allocation information for PDSCH to the terminal through higher layer signaling (e.g., RRC signaling). A table consisting of up to maxNrofDL-Allocations entries can be set up for the PDSCH. The time domain resource allocation information can include, for example, PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time point when the PDCCH is received and the time point when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0), information about the position and length of the start symbol for which the PDSCH is scheduled within the slot, and the mapping type of the PDSCH. The base station can notify the terminal of one of the entries in the table for the time domain resource allocation information through the 'Time Domain Resource Allocation Information' field in the DCI. The terminal can obtain time domain resource allocation information for the PDSCH based on DCI received from the base station.

[0274] - 'Frequency Domain Resource Allocation Information' (FDRA): The base station can inform the UE of the frequency domain resources for the PDSCH through 'Frequency Domain Resource Allocation Information'. For example, the base station can inform the UE of the start position and length of consecutively allocated VRBs (virtual resource blocks) as RB allocation information for the UE. The 'Frequency Domain Resource Allocation Information' field can be composed of a Resource Indication Value (RIV), and the RIV indicates the start point of the VRB (RB start ) and the length of the consecutively allocated RB (L RBs) can be composed of. As another example, frequency domain resources can be allocated as a bitmap composed of N_RBG bits. Here, N_RBG means the number of RBGs (resource block groups) determined by the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size, and data is transmitted to the RBG indicated as 1 by the bitmap.

[0275] The PDCCH carrying the DCI for the above PDSCH scheduling can be mapped to a UE-specific search space (USS) and transmitted. The scheduling allocation information for the UE-specific PDSCH can be received by the UE by examining the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's ID (Identity) and various system parameters.

[0276] <Example 4>

[0277] The fourth embodiment describes a specific method according to the timing at which the base station notifies the terminal when the base station executes the 'RS muting' to reduce base station energy consumption.

[0278] The fourth embodiment is described below with reference to FIG. 10.

[0279] FIG. 10 is a diagram showing the timing relationship of control information according to one embodiment of the present disclosure.

[0280] Figure 10 illustrates an example in which the base station state switches between the base station normal mode (1001) and the base station power saving mode (1002) over time. In the example of Figure 10, the base station operates in the base station normal mode (1001) before time point T2 (1020), in the base station power saving mode (1002) between time points T2 (1020) and T3 (1030), and in the base station normal mode (1001) after time point T3 (1030).

[0281] As described above, in the base station power saving mode, energy savings of the base station can be achieved by at least partially stopping or minimizing the operations of the base station's power amplifier, RF device, baseband device, etc. In this way, since the base station's transmission and reception operations are restricted in the base station power saving mode, it is preferable that signaling related to the base station energy saving mode be performed before or after the base station energy saving mode. According to the fourth embodiment, the base station can notify the terminal that it is operating in the base station power saving mode by the following method.

[0282] Method 1: The base station can notify the terminal of the start of the base station power saving mode. In the example of Fig. 10, the base station notifies the terminal of the start of the base station power saving mode by signaling at time T1 (1010) by D1 (1070) earlier than time T2 (1020) when the base station power saving mode starts to be executed (1050). The D1 (1070) should be long enough to secure processing time for the terminal to obtain the base station signaling at time T1 (1010) and perform terminal operations according to the transition to the base station power saving mode no later than time T2 (1020) (T1 + D1 ≤ T2).

[0283] Method 2: The base station can notify the terminal after the base station power saving mode is activated. In the example of FIG. 10, the base station notifies the terminal that the base station power saving mode has been activated by signaling at time T4 (1040), which is later than time T2 (1020) when the base station power saving mode starts to be activated (1060). At this time, the base station signaling is to occur no later than time T5 (1045) (T4 ≤ T5). T5 satisfies the condition T5 = T2 + D2, and represents a period of time during which the terminal can recognize the base station power saving mode post-facto and effectively utilize it. That is, if the terminal recognizes the transition to the base station power saving mode after the D2 period has elapsed, the terminal's utilization of the base station signaling will decrease. As a modified example of Method 2, D2 can also be defined as the time elapsed from time T3 when the base station power saving mode ends.

[0284] In the above methods 1 and 2, the content of the base station signaling may include at least some of the following.

[0285] - 'RS muting' time information: This is the time information at which 'RS muting' is applied, and can be expressed as {start time, end time}, or {start time, valid interval from start time}. Referring to Fig. 10, it can be expressed as {T2, T3}.

[0286] - 'RS muting' frequency information: This is the frequency information to which 'RS muting' is applied, and can be expressed as {start point, end point} in the frequency domain, or {start point, valid interval from the start point}. If 'RS muting' is fixed to always be applied across the entire band, there is no need to signal 'RS muting' frequency information separately.

[0287] - Information on the signal to which 'RS muting' is applied: This is information that specifically indicates the signal to which 'RS muting' is applied. For example, it can indicate whether 'RS muting' is applied to CSI-RS, 'RS muting' is applied to SSB, or 'RS muting' is applied to both CSI-RS and SSB.

[0288] FIG. 11 is a diagram illustrating a terminal transceiver device in a wireless communication system according to one embodiment of the present disclosure. For convenience of explanation, devices not directly related to the present disclosure may be omitted from the illustration and description.

[0289] Referring to FIG. 11, the terminal may be configured with a transmitter (1104) including an uplink transmission processing block (1101), a multiplexer (1102), and a transmission RF block (1103), a receiver (1108) including a downlink reception processing block (1105), a demultiplexer (1106), and a reception RF block (1107), and a control unit (1109). As described above, the control unit (1109) may control each of the configuration blocks of the receiver (1108) for receiving a data channel or control channel transmitted by the base station and each of the configuration blocks of the transmitter (1104) for transmitting an uplink signal.

[0290] In the transmitter (1104) of the terminal, the uplink transmission processing block (1101) can generate a signal to be transmitted by performing processes such as channel coding and modulation. The signal generated in the uplink transmission processing block (1101) can be multiplexed with another uplink signal by a multiplexer (1102), and then transmitted to the base station after signal processing in the transmission RF block (1103).

[0291] The terminal's receiving unit (1108) demultiplexes the signal received from the base station and distributes it to each downlink receiving processing block. The downlink receiving processing block (1105) can perform processes such as demodulation and channel decoding on the downlink signal of the base station to obtain control information or data transmitted by the base station. The terminal receiving unit (1108) can support the operation of the control unit (1109) by applying the output result of the downlink receiving processing block to the control unit (1109).

[0292] FIG. 12 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0293] Referring to FIG. 12, the terminal of the present disclosure may include a processor (1230), a transceiver (1210), and a memory (1220). However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the processor (1230), the transceiver (1210), and the memory (1220) may be implemented in the form of a single chip. According to one embodiment, the transceiver (1210) of FIG. 12 may include the transmitter (1104) and receiver (1108) of FIG. 11. In addition, the processor (1230) of FIG. 12 may include the control unit (1109) of FIG. 11.

[0294] According to one embodiment, the processor (1230) may control a series of processes that enable the terminal to operate according to the above-described embodiments of the present disclosure. For example, when the base station performs a power consumption reduction operation according to the embodiment of the present disclosure, the terminal may control components of the terminal depending on whether or not 'RS muting' is performed. There may be one or more processors (1230), and the processors (1230) may perform transmission and reception operations of the terminal in a wireless communication system that applies the operations of the present disclosure described above by executing a program stored in the memory (1220).

[0295] The transceiver (1210) can transmit and receive signals with a base station. The signals transmitted and received with the base station can include control information and data. The transceiver (1210) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, the transceiver (1210) is only one embodiment, and the components of the transceiver (1210) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (1210) can receive a signal through a wireless channel, output it to the processor (1230), and transmit a signal output from the processor (1230) through the wireless channel.

[0296] According to one embodiment, the memory (1220) can store programs and data required for the operation of the terminal. In addition, the memory (1220) can store control information or data included in signals transmitted and received by the terminal. The memory (1220) can be configured as a storage medium or a combination of storage media such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, there can be a plurality of memories (1220). According to one embodiment, the memory (1220) can store a program for performing transmission and reception operations of the terminal according to the power consumption reduction operation of the base station and whether or not 'RS muting' is performed, which are the embodiments of the present disclosure described above.

[0297] FIG. 13 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0298] Referring to FIG. 13, the base station of the present disclosure may include a processor (1330), a transceiver (1310), and a memory (1320). However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. Furthermore, the processor (1330), the transceiver (1310), and the memory (1320) may be implemented in the form of a single chip.

[0299] The processor (1330) can control a series of processes so that the base station can operate according to the embodiments of the present disclosure described above. For example, according to the embodiments of the present disclosure, the components of the base station can be controlled to perform a method of scheduling a terminal based on the power consumption reduction operation of the base station and whether 'RS muting' is performed. There may be one or more processors (1330), and the processors (1330) can perform the terminal scheduling method of the present disclosure described above by executing a program stored in the memory (1320).

[0300] The transceiver (1310) can transmit and receive signals with the terminal. The signals transmitted and received with the terminal can include control information and data. The transceiver (1310) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, an RF receiver that low-noise amplifies the received signal and down-converts the frequency, etc. However, the transceiver (1310) is only one embodiment, and the components of the transceiver (1310) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (1310) can receive a signal through a wireless channel and output it to the processor (1330), and transmit a signal output from the processor (1330) through the wireless channel.

[0301] According to one embodiment, the memory (1320) can store programs and data required for the operation of the base station. In addition, the memory (1320) can store control information or data included in signals transmitted and received by the base station. The memory (1320) can be configured as a storage medium or a combination of storage media such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, there can be a plurality of memories (1320). According to one embodiment, the memory (1320) can store a program for performing a method for scheduling a terminal according to the power consumption reduction operation of the base station and whether or not 'RS muting' is performed, which are the embodiments of the present disclosure described above.

[0302] 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.

[0303] 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.

[0304] These programs (software modules, software) may be stored in a non-volatile memory including random access memory, flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage devices, compact disc ROMs (CD-ROMs), digital versatile discs (DVDs) or other forms of optical storage devices, magnetic cassettes, or 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.

[0305] 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.

[0306] 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.

[0307] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help understand the present disclosure, and are not intended to limit the scope of the present disclosure. Although specific terms have been used, they are used only in a general sense to easily explain the technical contents of the present disclosure and to help understand the disclosure, and are not intended to limit the scope of the present disclosure. In addition, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, each of the above embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and another embodiment can be combined with each other to operate a base station and a terminal. In addition, the embodiments of the present disclosure can be applied to other communication systems, and other modifications based on the technical idea of ​​the embodiments can also be implemented.

Claims

1. In a method performed by a terminal in a communication system, A step of receiving settings related to a DL (downlink) RS (reference signal) of a serving cell through upper layer signaling; A step of identifying multiple DL RS resources based on the above settings; A step of receiving DCI (downlink control information) including first information about muting of one or more DL RS resources among the plurality of DL RS resources; and A method comprising the step of performing a measurement operation for the serving cell based on the remaining DL RS resources excluding one or more muted DL RS resources among the plurality of DL RS resources.

2. In paragraph 1, For one or more of the above muted DL RS resources, no measurement operation is performed or a measurement operation for inter-cell interference is performed, A method, wherein second information is received via the higher layer signaling or included in the DCI, indicating not to perform a measurement operation for one or more of the muted DL RS resources or to perform a measurement operation that causes inter-cell interference.

3. In paragraph 1, A setting related to the muting capability of at least some of the DL RS resources among the above plurality of DL RS resources is received through the upper layer signaling, A mapping relationship between the possible values of the first information and at least one DL RS resource among at least some DL RS resources set to be mutable is preset, A method wherein the one or more muted DL RS resources are identified among the at least some DL RS resources based on the value of the first information and the mapping relationship.

4. In paragraph 1, The CRC (cyclic redundancy check) for the above DCI is scrambled with a radio network temporary identifier (RNTI) corresponding to the group-common, The above terminal is included in a terminal group corresponding to an RNTI corresponding to the above group-common, A method in which a physical downlink control channel (PDCCH) for the above DCI is monitored in a common search space (CSS) set for the terminal group.

5. In paragraph 1, The above DCI includes a TDRA (time domain resource allocation) field for time resources for a PDSCH (physical downlink shared channel) and an FDRA (frequency domain resource allocation) field for frequency resources for the PDSCH. A method in which the PDCCH for the above DCI is monitored in a USS (UE-specific search space) set for the terminal.

6. In paragraph 1, The above muting is related to the NES (network energy saving) mode, and third information is received that the NES mode has been switched, The time at which the above third information is received is: At least one period of time prior to the time of transition to said NES mode; or A time point within at least the second time period from the time of transition to the above NES mode, Each of the first time length and the second time length is related to the processing capability of the terminal, A method according to claim 1, wherein the third information includes at least one of muting time information to which the muting is applied, muting frequency information to which the muting is applied, or information on at least one DL RS type to which the muting is applied.

7. At the terminal of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Receive settings related to the DL (downlink) RS (reference signal) of the serving cell through upper layer signaling; Identify multiple DL RS resources based on the above settings; Receiving downlink control information (DCI) including first information about muting of one or more DL RS resources among the plurality of DL RS resources; and A terminal configured to perform a measurement operation for the serving cell based on the remaining DL RS resources excluding one or more muted DL RS resources among the plurality of DL RS resources.

8. In paragraph 7, For one or more of the above muted DL RS resources, no measurement operation is performed or a measurement operation for inter-cell interference is performed, A terminal, wherein second information is received via the upper layer signaling or included in the DCI, indicating not to perform a measurement operation for one or more of the muted DL RS resources or to perform a measurement operation that performs inter-cell interference.

9. In paragraph 7, A setting related to the muting capability of at least some of the DL RS resources among the above plurality of DL RS resources is received through the upper layer signaling, A mapping relationship between the possible values of the first information and at least one DL RS resource among at least some DL RS resources set to be mutable is preset, A terminal wherein the one or more muted DL RS resources are identified among at least some DL RS resources based on the value of the first information and the mapping relationship.

10. In paragraph 7, The CRC (cyclic redundancy check) for the above DCI is scrambled with a radio network temporary identifier (RNTI) corresponding to the group-common, The above terminal is included in a terminal group corresponding to an RNTI corresponding to the above group-common, A method in which a physical downlink control channel (PDCCH) for the above DCI is monitored in a common search space (CSS) set for the terminal group.

11. In paragraph 7, The above DCI includes a TDRA (time domain resource allocation) field for time resources for a PDSCH (physical downlink shared channel) and an FDRA (frequency domain resource allocation) field for frequency resources for the PDSCH. The PDCCH for the above DCI is monitored in the USS (UE-specific search space) set for the terminal.

12. In paragraph 7, The above muting is related to the NES (network energy saving) mode, and third information is received that the NES mode has been switched, The time at which the above third information is received is: At least one period of time prior to the time of transition to said NES mode; or A time point within at least the second time period from the time of transition to the above NES mode, Each of the first time length and the second time length is related to the processing capability of the terminal, A terminal wherein the third information includes at least one of muting time information to which the muting is applied, muting frequency information to which the muting is applied, or information on at least one DL RS type to which the muting is applied.

13. In a method performed by a base station in a communication system, A step of transmitting a configuration related to a DL (downlink) RS (reference signal) through upper layer signaling, wherein the configuration is related to a plurality of DL RS resources; A step of transmitting DCI (downlink control information) including first information about muting of one or more DL RS resources among the plurality of DL RS resources; and A method comprising the step of receiving information about a measurement result based on the remaining DL RS resources excluding one or more muted DL RS resources among the plurality of DL RS resources.

14. In paragraph 13, A setting related to the muting capability of at least some of the DL RS resources among the above plurality of DL RS resources is transmitted through the upper layer signaling, A method wherein a mapping relationship between possible values of the first information and at least one DL RS resource among at least some DL RS resources set to be mutable is preset.

15. In the base station of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Transmitting settings related to DL (downlink) RS (reference signal) through upper layer signaling, said settings being related to multiple DL RS resources; Transmitting DCI (downlink control information) including first information about muting of one or more DL RS resources among the plurality of DL RS resources; and A base station configured to receive information on a measurement result based on the remaining DL RS resources excluding one or more muted DL RS resources among the plurality of DL RS resources.

Images