Method and device for transmitting and receiving signal in wireless communication system configured by heterogeneous radio access technologies

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An embodiment of the present disclosure provides a transmission and reception device and method of a terminal and a base station having improved frequency use efficiency in a mobile communication system. A method of a terminal according to an embodiment of the present disclosure comprises the steps of: receiving control channel-related configuration information from a base station; determining radio resources to which a physical downlink control channel (PDCCH) and a PDCCH demodulation reference signal (DMRS) of a first communication system and a PDCCH and a PDCCH DMRS of a second communication system are mapped and which are indicated by the control channel-related configuration information; and receiving, from the base station, the PDCCH and the PDCCH DMRS of the first communication system on the basis of the determined radio resources.

Description

Method and apparatus for transmitting and receiving signals in a wireless communication system composed of heterogeneous wireless access technologies

[0001] The present disclosure relates to a communication method of a wireless communication system, and more specifically to a method and apparatus for defining efficient frequency usage and transmission and reception operations of a terminal.

[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 frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands known as millimeter wave (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, measures are being considered to achieve even faster transmission speeds and even lower ultra-low latency compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as operating multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

[0004] In addition, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology in consideration of the services that the 5G mobile communication technology was intended to support. Standardization has been carried out for technologies such as V2X (Vehicle-to-Everything), which helps autonomous vehicles make driving decisions and enhance user convenience based on their own location and status information transmitted by the vehicle; NR-U (New Radio Unlicensed), which aims for system operation in unlicensed bands to comply with various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] In addition, standardization was also carried out for technologies such as the Industrial Internet of Things (IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes to expand network service areas by integrating wireless backhaul links and access links, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) Handover, and 2-step RACH for NR which simplifies random access procedures.

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

[0007] With the commercialization of such 5G mobile communication systems, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using 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 advancement of these 5G mobile communication systems can serve as a foundation for the development of new waveforms for ensuring coverage of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas, metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), and Reconfigurable Intelligent Surface (RIS) technology, as well as Full Duplex technology for improving frequency efficiency and system networks of 6G mobile communication technology, AI-based communication technology that realizes system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology that realizes services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources.

[0009] The disclosed embodiments aim to provide an apparatus and method capable of effectively providing mobile communication services. Specifically, they provide a procedure for the efficient use of frequencies by a base station and a terminal.

[0010] The technical problems to be solved in the disclosed embodiments are not limited to those mentioned above, and other unmentioned technical problems may be considered by those skilled in the art from the various embodiments of the present disclosure described below.

[0011] A method performed by a terminal in a wireless communication system according to one embodiment of the present disclosure comprises: receiving control channel related configuration information from a base station; determining wireless resources to which a physical downlink control channel (PDCCH) and a demodulation reference signal (PDCCH DMRS) of a first communication system and a PDCCH and a PDCCH DMRS of a second communication system are mapped, as indicated by the control channel related configuration information; and receiving the PDCCH and a PDCCH DMRS of the first communication system from the base station based on the determined wireless resources; wherein the first wireless resource for receiving the PDCCH DMRS of the first communication system and the second wireless resource for receiving the PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

[0012] A method performed by a base station in a wireless communication system according to one embodiment of the present disclosure comprises: a step of transmitting control channel-related configuration information to a terminal, wherein the control channel-related configuration information represents wireless resources to which the physical downlink control channel (PDCCH) and demodulation reference signal (PDCCH DMRS) of the first communication system and the PDCCH and PDCCH DMRS of the second communication system are mapped; and a step of transmitting the PDCCH and PDCCH DMRS of the first communication system to the terminal based on the wireless resources to which the PDCCH and PDCCH DMRS of the first communication system are mapped, wherein the first wireless resource for receiving the PDCCH DMRS of the first communication system and the second wireless resource for receiving the PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

[0013] In a wireless communication system according to one embodiment of the present disclosure, a terminal comprises: a transceiver; and at least one processor; wherein the at least one processor receives control channel related configuration information from a base station, determines wireless resources to which a physical downlink control channel (PDCCH) and demodulation reference signal (PDCCH DMRS) of a first communication system and a PDCCH and PDCCH DMRS of a second communication system are mapped, and is configured to receive the PDCCH and PDCCH DMRS of the first communication system from the base station based on the determined wireless resources, and the first wireless resource for receiving the PDCCH DMRS of the first communication system and the second wireless resource for receiving the PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

[0014] In a wireless communication system according to one embodiment of the present disclosure, a base station comprises: a transceiver; and at least one processor; wherein the at least one processor transmits control channel related configuration information to a terminal—the control channel related configuration information represents wireless resources to which the physical downlink control channel (PDCCH) and demodulation reference signal (PDCCH DMRS) of the first communication system and the PDCCH and PDCCH DMRS of the second communication system are mapped—and is configured to transmit the PDCCH and PDCCH DMRS of the first communication system to the terminal based on the wireless resources to which the PDCCH and PDCCH DMRS of the first communication system are mapped, and the first wireless resource for receiving the PDCCH DMRS of the first communication system and the second wireless resource for receiving the PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

[0015] An embodiment of the present disclosure provides a transceiver device and method for a terminal and a base station that increases frequency usage efficiency in a mobile communication system.

[0016] The effects obtainable from the disclosed embodiments are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by a person skilled in the art based on the following detailed description.

[0017] FIG. 1 is a diagram showing the basic structure of the time-frequency resource domain of a 5G system according to one embodiment of the present disclosure.

[0018] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0019] FIG. 3 is a diagram illustrating a procedure in which a terminal reports terminal capability (UE capability) information to a base station according to one embodiment of the present disclosure.

[0020] FIG. 4 is a drawing showing an example of a bandwidth portion setting according to one embodiment of the present disclosure.

[0021] FIG. 5 is a diagram showing the interrelationship between frequency bands and coverage according to one embodiment of the present disclosure.

[0022] FIG. 6 is a diagram showing an example of dynamic frequency sharing according to one embodiment of the present disclosure.

[0023] FIG. 7 is a diagram illustrating an example of dynamic frequency sharing according to one embodiment of the present disclosure.

[0024] FIG. 8 is a diagram showing an example of a PDCCH wireless resource setting method according to one embodiment of the present disclosure.

[0025] FIG. 9 is a diagram showing an example of a PDCCH wireless resource setting method according to one embodiment of the present disclosure.

[0026] FIG. 10 is a diagram showing an example of a PDCCH wireless resource setting method according to one embodiment of the present disclosure.

[0027] FIG. 11 is a drawing showing an example of inter-cell interference occurring according to one embodiment of the present disclosure.

[0028] FIG. 12 is a diagram showing an example of PDCCH DMRS mapping according to one embodiment of the present disclosure.

[0029] FIG. 13 is a diagram showing an example of PDCCH DMRS mapping according to one embodiment of the present disclosure.

[0030] FIG. 14 is a diagram showing an example of PDCCH DMRS mapping according to one embodiment of the present disclosure.

[0031] FIG. 15 is a diagram showing an example of PDCCH DMRS mapping according to one embodiment of the present disclosure.

[0032] FIG. 16 is a diagram showing an example of PDCCH DMRS mapping according to one embodiment of the present disclosure.

[0033] FIG. 17 is a diagram showing an example of PDCCH DMRS mapping according to one embodiment of the present disclosure.

[0034] FIG. 18 is a drawing showing an example of terminal operation according to one embodiment of the present disclosure.

[0035] FIG. 19 is a drawing showing an example of base station operation according to one embodiment of the present disclosure.

[0036] FIG. 20 is a drawing showing a terminal transceiver device according to one embodiment of the present disclosure.

[0037] FIG. 21 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0038] FIG. 22 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0039] The implementation of the present disclosure will be described in detail below with reference to the accompanying drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known functions or configurations would unnecessarily obscure the essence of the present disclosure, such detailed description will be omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0040] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to make the present disclosure 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. Throughout the specification, like reference numerals refer to like components.

[0041] At this time, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment may create means for performing the functions described in the flow diagram block(s). Since these computer program instructions may also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory may also be able to produce a manufactured item containing instruction means for performing the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0042] Additionally, each block may represent a module, segment, and / or part of code containing one or more executable instructions for executing a specified logical function(s). Also, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0043] In this embodiment, the term "part" used may refer to software or hardware components such as FPGAs (Field Programmable Gate Arrays) or ASICs (Application Specific Integrated Circuits), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and / or 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." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0044] In the present disclosure, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B, or C” may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as “first,” “second,” or “first” or “second” may be used simply to distinguish a corresponding component from another corresponding component and do not limit the corresponding components in other aspects (e.g., importance or order).

[0045] In describing the present disclosure below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the present disclosure. Embodiments of the present disclosure will be described below with reference to the attached drawings.

[0046] 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 examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0047] In the following description, the terms "physical channel" and "physical signal" may be used interchangeably with "data" or "control signal." For example, PDSCH (physical downlink shared channel) is a term referring to a physical channel through which data is transmitted, but PDSCH may also be used to refer to data. That is, in this disclosure, the expression "transmits a physical channel" may be interpreted as equivalent to the expression "transmits data or a signal through a physical channel."

[0048] In the present disclosure, upper layer signaling may refer to a signal transmission method transmitted from a base station to a terminal using a physical layer downlink data channel, or from a terminal to a base station using a physical layer uplink data channel. Upper layer signaling may be understood as a Master Information Block (MIB), System Information Block (SIB), Radio Resource Control (RRC) signaling, or Media Access Control (MAC) control element (CE).

[0049] For the convenience of the following description, the present disclosure uses terms and names defined in the 3GPP NR (New Radio: 5th generation mobile communication standard) specifications. However, the present disclosure is not limited to the above terms and names and may be applied equally to systems conforming to other standards. For example, regarding 6G systems, which are still in the early stages of standardization discussion, terms and names defined in 5G systems may be generalized and used to describe the operation of 6G systems unless otherwise specifically noted.

[0050] Hereinafter, the base station is an entity that performs resource allocation for terminals and may be at least one of a gNodeB, gNB, eNodeB, eNB, NodeB, BS (Base Station), wireless access unit, base station controller, or a node on a network. The terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, IoT device, sensor, or multimedia system capable of performing communication functions. Of course, it is not limited to the examples described.

[0051] While existing mobile communication systems focused on conventional voice / data communication, 5G systems aim to satisfy various services and requirements, such as enhanced mobile broadband (eMBB) services to improve existing voice / data communication, ultra-reliable and low latency communication (URLLC) services, and massive machine type communication (MTC) services to support mass communication of the machine.

[0052] While the transmission bandwidth per carrier of existing mobile communication systems, such as LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution), is limited to a maximum of 20 MHz, 5G systems aim to provide ultra-high-speed data services reaching several Gbps by utilizing significantly wider ultra-wide bandwidths. Accordingly, 5G systems are considering ultra-high frequency bands ranging from several GHz to up to 100 GHz as operating frequencies, where securing ultra-wide bandwidth frequencies is relatively easy. Additionally, it is possible to secure wide bandwidth frequencies for 5G systems through frequency reallocation or allocation from frequency bands ranging from hundreds of MHz to several GHz used by existing mobile communication systems.

[0053] Radio waves in the ultra-high frequency band have wavelengths of several millimeters and are also called millimeter waves (mmWave). However, in the ultra-high frequency band, path loss of radio waves increases in proportion to the frequency band, so the coverage of mobile communication systems can be reduced.

[0054] According to one embodiment, to overcome the disadvantage of reduced coverage in the ultra-high frequency band, beamforming technology can be applied by using multiple antennas to concentrate the radiated energy of radio waves toward a predetermined target point, thereby increasing the reach of the radio waves. That is, a signal to which beamforming technology is applied has a relatively narrow beam width, and since the radiated energy is concentrated within the narrowed beam width, the reach of the radio waves can be increased. Beamforming technology can be applied to both the transmitting end and the receiving end. In addition to the effect of increasing coverage, beamforming technology may have the effect of reducing interference in areas outside the beamforming direction. For beamforming technology to operate properly, accurate measurement and feedback methods of the transmitting and / or receiving beams may be required. Beamforming technology can be applied to a control channel or data channel that corresponds one-to-one between a predetermined terminal and a base station. In addition, beamforming technology can be applied to common signals transmitted by a base station to multiple terminals within the system, such as synchronization signals, physical broadcast channels (PBCH), control channels for transmitting system information, and data channels, to increase coverage. When applying beamforming technology to common signals, beam sweeping technology, which changes the beam direction to transmit the signal, can be additionally applied to ensure that the common signal reaches terminals located at any position within the cell.

[0055] Another requirement for 5G systems is ultra-low latency services, where the transmission delay between the transmitter and receiver is approximately 1ms. As a measure to reduce transmission delay, it is necessary to design a frame structure based on a short TTI (transmission time interval) that is shorter than that of LTE and LTE-A. TTI is the basic time unit for performing scheduling, and the TTI of existing LTE and LTE-A systems is 1ms, which corresponds to the length of one subframe. For example, in 5G systems, short TTIs such as 0.5ms, 0.25ms, and 0.125ms are possible, which are shorter than those of existing LTE and LTE-A systems, to satisfy the requirements for ultra-low latency services.

[0056] FIG. 1 is a diagram showing the basic structure of a time-frequency resource area, which is a wireless resource area where data or control channels of a 5G system according to one embodiment of the present disclosure are transmitted.

[0057] Referring to FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit of a 5G system in the time domain is an OFDM (orthogonal frequency division multiplexing) symbol, A number of symbols (102) are combined to form a slot (106), and A number of slots can be combined to form a single subframe (105). The length of a single subframe (105) is 1.0 ms, and 10 subframes can be combined to form a single frame (114), and the length of the frame (114) is 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is a total of N BW It can be composed of several subcarriers (104).

[0058] In the time-frequency domain, the basic unit of a resource 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 in the frequency domain. It can be defined as a series of consecutive subcarriers (110). In a 5G system = 12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0059] In a 5G system, base stations map data in RB units and can generally perform scheduling on RBs that constitute a slot for a given terminal. That is, in a 5G system, the basic time unit for which scheduling is performed is a slot, and the basic frequency unit for which scheduling is performed may be an RB.

[0060] OFDM symbol count It can be determined by the length of the cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, if a normal CP is applied = 14, if Extended CP is applied = 12. Extended CP is applied to systems with relatively longer transmission distances than standard CP, enabling the maintenance of orthogonality between symbols. In the case of standard CP, the ratio of CP length to symbol length is maintained at a constant value, allowing the overhead caused by CP to remain constant regardless of the subcarrier spacing. That is, if the subcarrier spacing is small, the symbol length increases, and consequently, the CP length can also increase. Conversely, if the subcarrier spacing is large, the symbol length decreases, and consequently, the CP length can be reduced. The symbol length and CP length can be inversely proportional to the subcarrier spacing.

[0061] In 5G systems, various frame structures can be supported by adjusting the subcarrier spacing to satisfy various services and requirements. For example, the characteristics according to the subcarrier spacing are as follows.

[0062] From the perspective of the operating frequency band, a larger subcarrier spacing is advantageous for recovering phase noise in the high-frequency band.

[0063] - From the perspective of transmission time, a large subcarrier spacing shortens the symbol length in the time domain, and consequently shortens the slot length, which is advantageous for supporting ultra-low latency services such as URLLC.

[0064] - From the perspective of cell size, a longer CP length allows for the support of larger cells, so a smaller subcarrier spacing allows for the support of relatively larger cells. A cell is a concept in mobile communication that refers to the area covered by a single base station.

[0065] Subcarrier spacing and CP length are essential information for OFDM transmission and reception; therefore, smooth transmission and reception are possible only when the base station and the terminal recognize these values ​​as common. Table 1 shows the subcarrier spacing configuration (μ) and subcarrier spacing ( It shows an example of the relationship between ), CP lengths.

[0066]

[0067] [Table 2] shows the subcarrier spacing settings for the standard CP ( ) By category, number of symbols per slot ( ), number of slots per frame ( ), number of slots per subframe ( Shows an example of ).

[0068]

[0069] [Table 3] shows the subcarrier spacing settings for extended CP ( ) By category, number of symbols per slot ( ), number of slots per frame ( ), number of slots per subframe ( Represents an example of ).

[0070]

[0071] A 5G system can satisfy various user requirements through coexistence or dual-mode operation with existing LTE or / and LTE-A (hereinafter LTE / LTE-A) systems. For example, existing LTE / LTE-A systems can provide stable system operation to terminals, while 5G systems can perform the role of providing enhanced services to terminals. Therefore, the frame structure of a 5G system needs to include at least the frame structure of LTE / LTE-A or a set of essential parameters (subcarrier spacing = 15 kHz).

[0072] For example, when comparing a frame structure with a subcarrier spacing setting μ=0 (hereinafter frame structure A) and a frame structure with a subcarrier spacing setting μ=1 (hereinafter frame structure B), compared to frame structure A, frame structure B shows that the subcarrier spacing and RB size are doubled, while the slot length and symbol length are doubled. In the case of frame structure B, 2 slots can form one subframe, and 20 subframes can form one frame.

[0073] By generalizing the frame structure of a 5G system, high scalability can be provided by ensuring that the essential parameter sets, such as subcarrier spacing, CP length, and slot length, have an integer multiple relationship with each other for each frame structure. Additionally, a subframe of fixed length of 1ms can be defined to represent a reference time unit independent of the frame structure.

[0074] The frame structure of a 5G system can be applied to various scenarios. From the perspective of cell size, since a longer CP length enables support for larger cells, Frame Structure A can support relatively larger cells compared to Frame Structure B. From the perspective of operating frequency band, since a larger subcarrier spacing is advantageous for recovering phase noise in the high-frequency band, Frame Structure B can support relatively higher operating frequencies compared to Frame Structure A. From the perspective of service, since a shorter slot length—the basic time unit of scheduling—is advantageous for supporting ultra-low latency services such as URLLC, Frame Structure B may be relatively more suitable for URLLC services compared to Frame Structure A.

[0075] In a manner similar to the coexistence of 5G and LTE / LTE-A mentioned above, it may be necessary to design a system for the coexistence of 6G, which will arrive with the evolution of future communication systems, and existing systems such as 5G or LTE / LTE-A.

[0076] In the following description of the present disclosure, an uplink (UL) refers to a wireless link through which a terminal transmits data or control signals to a base station, and a downlink (DL) may refer to a wireless link through which a base station transmits data or control signals to a terminal.

[0077] In the initial access phase, when the terminal first connects to the system, the terminal can synchronize downlink time and frequency from the synchronization signal (SS) transmitted by the 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. The MIB may include at least one of the following information.

[0078] MIB ::= SEQUENCE {

[0079] systemFrameNumber BIT STRING (SIZE (6));

[0080] subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120},

[0081] ssb-SubcarrierOffset INTEGER (0..15);

[0082] dmrs-TypeA-Position ENUMERATED {pos2, pos3},

[0083] pdcch-ConfigSIB1 PDCCH-ConfigSIB1,

[0084] cellBarred ENUMERATED {barred, notBarred},

[0085] intraFreqReselection ENUMERATED {allowed, notAllowed},

[0086] spare BIT STRING (SIZE (1))

[0087] }

[0088] For example, the above essential system information may include at least one of the following: information regarding the location of a synchronization signal received by the terminal in the time domain and / or frequency domain; control information for the terminal to receive at least one of system information (or system information block, SIB) transmitted by the base station (which may be information for scheduling a data channel for receiving system information); information regarding whether the cell is connectable; and information regarding the SCS of the cell. The above essential system information may be referred to as system information.

[0089] Additionally, the terminal can receive system information transmitted by the base station to obtain cell-common transmission and reception control information. Cell-common transmission and reception control information may include random access control information, paging control information, and at least one of common control information for various physical channels and signals (at least one of channels and signals, such as an uplink control channel, an uplink data channel, a downlink control channel and a downlink data channel, a physical signal for obtaining uplink channel status information, a physical signal for obtaining downlink channel status information, and a physical signal for demodulating a physical channel). For example, the control information may be configuration information for each channel or signal. For example, the system information may be referred to as SIB1 or RMSI (remaining minimum system information).

[0090] The synchronization signal is a signal that serves as a reference for cell search, and a subcarrier spacing may be applied for each frequency band to suit channel environments such as phase noise. In the case of data channels or control channels, as described above, the subcarrier spacing may be applied differently depending on the service type to support various services. In a 5G system, a combination consisting of PSS (primary synchronization signal), SSS (secondary synchronization signal), and PBCH (Physical broadcast channel) can be referred to as an SS / PBCH block or SSB. For example, an SSB may consist of N1 PSS symbols, N2 SSS symbols, and N3 PBCH symbols.

[0091] In addition to the above initial connection procedure, the terminal may also receive an SSB to determine whether the radio link quality of the current cell is maintained at a certain level or higher. Additionally, in the procedure where the terminal performs a handover from the current cell to an adjacent cell, the terminal may receive an SSB from an adjacent cell to determine the radio link quality of the adjacent cell and to obtain time / frequency synchronization of the adjacent cell.

[0092] After the terminal obtains MIB and system information from the base station through the initial access procedure, the terminal may perform a random access procedure to transition the link with the base station from the idle state (or RRC_IDLE state) 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 will be described in detail below with reference to FIG. 2.

[0093] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0094] Referring to FIG. 2, as a first step (210) of the random access procedure, the terminal can transmit a random access preamble to the base station. The random access preamble, which is the initial 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 from a set of random access preambles given in advance by system information. The initial transmission power of the random access preamble can be determined according to the path loss between the base station and the terminal measured by the terminal. Additionally, 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.

[0095] In the second step (220), the base station may transmit a message to the terminal containing an uplink transmission timing control command based on the transmission delay value measured from the random access preamble received in the first step (210). The terminal may receive control information for scheduling the message over the downlink control channel and receive the message over the downlink data channel based on the control information. The message transmitted in the second step may be referred to as message 2, a response to the random access preamble, or a random access response. Additionally, the base station may transmit the message by including, as scheduling information, uplink resources to be used by the terminal to transmit a response message (message 3) to message 2 and power control commands to be applied to the response message. The scheduling information may include control information regarding the terminal's uplink transmission beam. Additionally, the message may further include a temporary identifier of the terminal to be used during the random access procedure. The information included in the message is merely an example, and one or more of the information described above may be included in message 2.

[0096] If the terminal does not receive message 2, which is scheduling information for message 3, from the base station within a predetermined time in the second step (220), the terminal may perform the first step (210) again. If the first step (210) is performed again, the terminal may increase the probability of receiving the random access preamble at the base station by increasing the transmission power of the random access preamble by a predetermined step (power ramping).

[0097] In the third step (230), the terminal can transmit uplink data (message 3) including its terminal ID to the base station via the 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 uplink transmission timing control command received from the base station in the second step (220). 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 refer to the first uplink data signal transmitted by the terminal to the base station after the transmission of the random access preamble. For example, the message 3 may include an upper layer message for the terminal to connect to the network.

[0098] In step 4 (240), if the base station determines that the terminal has performed random access without collision with other terminals, it may transmit data (message 4) containing 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 may determine that the random access was successful. Then, the terminal may transmit HARQ-ACK information indicating successful reception of message 4 to the base station through the Physical Uplink Control Channel (PUCCH).

[0099] If the data transmitted by the terminal in the third step (230) collides with the data of another terminal and the base station fails to receive the data signal from the terminal, the base station may not transmit any further data to the terminal. Accordingly, if the terminal fails to receive the data transmitted from the base station in the fourth step (240) within a certain period of time, it is determined that the random access procedure has failed, and the process may be restarted from the first step (210).

[0100] The four-step random access procedure described above is merely an example, and the information between the terminal and the base station described above may also be transmitted through messages other than the four-step message described above. For example, the terminal may transmit one or more messages containing at least one of the information of message 1 and message 3 to the base station simultaneously or sequentially, and the base station may transmit one or more messages containing at least one of the information of message 2 and message 4 to the terminal simultaneously or sequentially.

[0101] Upon successful completion of the random access procedure, the terminal transitions to a connected state, enabling one-to-one communication between the base station and the terminal. The base station can receive UE capability information from the terminal in the connected state. The base station can adjust scheduling by referring to the UE capability information of the terminal. Through the UE capability information, the terminal can inform the base station whether it supports certain functions and / or the maximum allowable value of the functions supported by the terminal. Therefore, the UE capability information reported by each terminal to the base station may be different for each terminal.

[0102] For example, the terminal may report UE capability information to the base station as UE capability information, including at least a portion of the following control information.

[0103] - Control information related to the frequency bands supported by the terminal

[0104] - Control information related to channel bandwidth supported by the terminal

[0105] - Control information regarding the maximum modulation scheme supported by the terminal

[0106] - Control information regarding the maximum number of beams supported by the terminal

[0107] - Control information regarding the maximum number of layers supported by the terminal

[0108] - Control information related to CSI reporting supported by the terminal

[0109] - Control information on whether the terminal supports frequency hopping

[0110] - Bandwidth-related control information when Carrier Aggregation (CA) is supported

[0111] - Control information on whether cross-carrier scheduling is supported when carrier bundling is supported

[0112] FIG. 3 is a diagram illustrating a procedure in which a terminal reports terminal capability (UE capability) information to a base station according to one embodiment of the present disclosure.

[0113] Referring to FIG. 3, in step 310, the base station (302) can send a UE capability information request message to the terminal (301). In response to the base station's UE capability information request, the terminal can send UE capability information to the base station in step 320.

[0114] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0115] FIG. 4 is a diagram illustrating an example of a bandwidth portion setting in a 5G communication system according to one embodiment of the present disclosure.

[0116] FIG. 4 shows an example in which the terminal bandwidth (UE bandwidth) (400) is configured into two bandwidth portions, namely bandwidth portion #1 (BWP#1) (401) and bandwidth portion #2 (BWP#2) (402). The base station may configure one or more bandwidth portions for the terminal and may configure the information in below for each bandwidth portion.

[0117]

[0118] Of course, the above examples are not limited, and various parameters related to bandwidth portions may be configured for the terminal in addition to the above configuration information. The above information may be transmitted by the base station to the terminal via higher-layer signaling, for example, Radio Resource Control (RRC) signaling. At least one of the configured bandwidth portions may be activated. Whether a configured bandwidth portion is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via Downlink Control Information (DCI).

[0119] According to some embodiments, prior to the RRC connection, the terminal may receive an Initial Bandwidth Part (Initial BWP) for initial connection from the base station via a Master Information Block (MIB). More specifically, during the initial connection phase, the terminal may receive configuration information regarding a Control Resource Set (CORESET) and a Search Space via the MIB, through which a Physical Downlink Control Channel (PDCCH) can be transmitted to receive System Information Blocks required for initial connection. The Control Resource Set and Search Space configured via the MIB may each be considered as Identity (ID) 0 (CORESET 0, Search Space 0). The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and / or subcarrier interval settings, for Control Resource Set #0. Additionally, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and monitoring occasion for Control Resource Set #0, i.e., configuration information for Search Space #0. The terminal may consider the frequency region set as control region #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0120] The settings for the bandwidth portion supported by the above 5G can be used for various purposes.

[0121] According to one embodiment, if the bandwidth supported by the terminal is smaller than the system bandwidth, this can be supported through the bandwidth portion setting. For example, by setting the frequency position of the bandwidth portion (setting information 2) to the terminal, the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

[0122] In addition, according to one embodiment, a base station may set multiple bandwidth portions for a terminal for the purpose of supporting different subcarrier spacing settings. For example, to support data transmission and reception using both a 15 kHz subcarrier spacing and a 30 kHz subcarrier spacing for a terminal, two bandwidth portions may be set to subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed (FDM), and when data is to be transmitted and received at a specific subcarrier spacing, the bandwidth portion set to that subcarrier spacing may be activated.

[0123] In addition, according to one embodiment, a base station may set a bandwidth portion having different bandwidth sizes for the purpose of reducing the power consumption of the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data using that bandwidth, very large power consumption may occur. In particular, in a situation where there is no traffic, monitoring an unnecessary downlink control channel using a large bandwidth of 100 MHz may be very inefficient in terms of power consumption. To reduce the power consumption of the terminal, the base station may set a bandwidth portion of a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0124] In the method for configuring the above bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the Initial Bandwidth Part (Initial BWP) via the MIB during the initial connection phase. More specifically, the terminal can receive a configuration of a control area (i.e., CORESET) for a downlink control channel through which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control area configured by the MIB can be considered as the Initial Bandwidth Part, and through the configured Initial Bandwidth Part, the terminal can receive the Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted. In addition to the purpose of receiving the SIB, the Initial Bandwidth Part may also be utilized for paging or random access.

[0125] Next, downlink control information (DCI) in 5G systems will be explained in detail.

[0126] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or scheduling information for downlink data (or physical downlink shared channel (PDSCH)) can be transmitted from a base station to a terminal via DCI. The terminal can monitor the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields predefined between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0127] DCI can be transmitted via the physical downlink control channel (PDCCH) after undergoing channel coding and modulation processes. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with the terminal's identity identifier (e.g., radio network temporary identifier, RNTI). Different RNTIs may be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, or random access responses. In other words, the RNTI may not be transmitted explicitly but may be included in the CRC calculation process. Upon receiving a DCI message transmitted via the PDCCH, the terminal checks the CRC using the assigned RNTI; if the CRC check result is correct, the terminal knows that the message has been transmitted to it.

[0128] For example, a DCI scheduling a PDSCH for system information can be scrambled to SI-RNTI. For example, a DCI scheduling a PDSCH for a RAR message can be scrambled to RA-RNTI. For example, a DCI scheduling a PDSCH for a paging message can be scrambled to P-RNTI. A DCI notifying a SFI (slot format indicator) can be scrambled to SFI-RNTI. A DCI notifying a TPC (transmit power control) can be scrambled to TPC-RNTI. For example, a DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled to C-RNTI (cell RNTI).

[0129] A base station may operate by applying a predetermined DCI format to a terminal to be scheduled, depending on whether the DCI is for scheduling information for downlink data (downlink assignment), scheduling information for uplink data (uplink grant), and / or for DCI used for purposes other than data scheduling, such as power control.

[0130] The base station can transmit downlink data to the terminal via the Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. Scheduling information, such as specific mapping locations in the time and frequency domains of the PDSCH, modulation schemes, HARQ-related control information, and power control information, can be provided by the base station to the terminal through the DCI related to downlink data scheduling information among the DCIs transmitted via the PDSCH.

[0131] The terminal can transmit uplink data to the base station via the PUSCH (physical uplink shared channel), which is 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 by the base station to the terminal through the DCI related to uplink data scheduling information among the DCIs transmitted via the PDCCH.

[0132] The time-frequency resource to which the PDCCH is mapped is called a control resource set (CORESET). In the frequency domain, a CORESET can be set to all or part of the frequency resources within the bandwidth supported by the terminal. In the time domain, it can be set to one or more OFDM symbols, which can be defined as the CORESET duration. A base station can set one or more CORESETs to the terminal via higher-layer signaling (e.g., System Information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Setting a CORESET to the terminal may mean providing information such as the CORESET identity, the frequency location of the CORESET, and the symbol length of the CORESET. The information provided by the base station to the terminal to set a CORESET may include at least some of the information included in Table 5.

[0133]

[0134] CORESET in the frequency domain It can be composed of RBs, and in the time domain It can be composed of symbols. A PDCCH can be composed of one or more CCEs (Control Channel Elements). One CCE can be composed of six REGs (Resource Element Groups), and a REG can be defined as one RB during one OFDM symbol. Within a CORESET, REGs can be indexed in time-first order starting with REG index 0, beginning with the first OFDM symbol of the CORESET, the lowest RB.

[0135] Interleaved and non-interleaved methods may be supported as transmission methods for PDCCH. The base station may configure the terminal to perform interleaved or non-interleaved transmission for each CORESET through upper-layer signaling. Interleaving may be performed on a REG bundle basis. A REG bundle may be defined as a set of one or more REGs. Based on the interleaved or non-interleaved transmission configuration received from the base station, the terminal may determine the CCE-to-REG mapping method in the corresponding CORESET in the manner shown in Table 6 below.

[0136]

[0137] The base station can inform the terminal of configuration information, such as which symbol the PDCCH is mapped to within the slot and the transmission period, through signaling.

[0138] The search space of a PDCCH is described as follows. The number of CCEs required to transmit a 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, one downlink control channel can be transmitted through L CCEs. The terminal performs blind decoding to detect signals without knowing information about the downlink control channel; to this end, 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 terminal must attempt to decode at a given aggregation level. Since there are various aggregation levels that form a group of 1, 2, 4, 8, or 16 CCEs, the terminal may have multiple search spaces. A Search Space Set can be defined as a set of search spaces at all established aggregation levels.

[0139] Search spaces can be classified into Common Search Spaces (CSS) and UE-specific Search Spaces (USS). A certain group of terminals or all terminals may monitor the Common Search Space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages for System Information Blocks (SIBs). For example, a terminal may receive scheduling allocation information for the PDSCH for receiving system information by examining the Common Search Space of the PDCCH. 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-agreed CCEs. Scheduling allocation information for the UE-specific PDSCH or PUSCH may be received by the terminal by monitoring the UE-specific Search Space of the PDCCH. The UE-specific Search Space may be defined specifically as a function of the terminal's ID (Identity) and various system parameters.

[0140] The base station may set configuration information for the search space of the PDCCH to the terminal through upper-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may set to the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the occasion for monitoring in slot-symbol units for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the CORESET index to be monitored in the search space. For example, parameters for the search space of the PDCCH may include at least one of the information shown in Table 7 below.

[0141]

[0142]

[0143]

[0144]

[0145] According to the configuration information, the base station may set one or more sets of search spaces for the terminal. According to some embodiments, the base station may set 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.

[0146] According to the configuration information, one or more sets of search spaces 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 a terminal-specific search space.

[0147] In the common search space, the terminal can monitor at least one of the following combinations of DCI formats and RNTI. Of course, it is not limited to the following examples.

[0148] - 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

[0149] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0150] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0151] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0152] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0153] Terminal—In a specific search space, the terminal may monitor at least one of the following combinations of DCI formats and RNTI. Of course, it is not limited to the following examples.

[0154] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0155] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0156] RNTIs may follow at least one of the following definitions and uses.

[0157] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH or PUSCH scheduling

[0158] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0159] CS-RNTI (Configured Scheduling RNTI): Used for semi-static terminal-specific PDSCH scheduling.

[0160] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase.

[0161] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0162] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0163] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH has been punctured.

[0164] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0165] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0166] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0167] The DCI formats described above may follow the definitions in Table 8 below.

[0168] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0169] The search space at aggregation level L in CORESET p and search space set s can be expressed as Equation 1 below.[Equation 1]

[0170]

[0171] The value may be 0 for the common search space.

[0172] 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 the ID set for the terminal by the base station) and the time index.

[0173] The following describes in detail how a terminal measures channel conditions in a 5G communication system and reports them to a base station.

[0174] Channel state information (CSI) may include at least one of the following information.

[0175] - Channel Quality Indicator (CQI): CQI index indication information consisting of a modulation scheme and coding rate that satisfy the predefined minimum receive error rate of PDSCH.

[0176] - Precoding Matrix Indicator (PMI): Precoding matrix indicator information selected by the terminal

[0177] - CRI (CSI-RS resource indicator): CSI-RS information measured by the terminal

[0178] - RI (Rank Indicator): Rank indicator information selected by the terminal

[0179] - LI (Layer indicator): Indicator information for the best layer among the precoding matrices reported by the terminal

[0180] - SSBRI (SS / PBCH block resource indicator): SSB information measured by the terminal

[0181] - L1-RSRP (Reference Signal Received Power): L1 RSRP information measured by the terminal

[0182] The base station can control at least one of the time and frequency resources for the aforementioned CSI measurement and reporting of the terminal.

[0183] For CSI measurement and reporting operations, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, and the base station can configure which method to use for the terminal via signaling. Semi-persistent CSI reporting methods may support 'Semi-PersistentOnPUCCH' and 'Semi-PersistentOnPUSCH'. In the case of periodic or semi-persistent CSI reporting methods, the terminal can receive the PUCCH or PUSCH resources to transmit the CSI from the base station via upper-layer signaling. The period and slot offset of the PUCCH or PUSCH resources to transmit the CSI can be provided by the subcarrier interval setting of the uplink (UL) bandwidth part configured for CSI reporting transmission. In the case of a non-periodic CSI reporting method, the terminal can receive a PUSCH resource to transmit the CSI from the base station via L1 signaling (the aforementioned DCI format 0_1) through scheduling.

[0184] Non-periodic CSI reporting of the terminal can be performed using PUSCH, periodic CSI reporting can be performed using PUCCH, and semi-permanent CSI reporting can be performed using PUSCH when triggered or activated by DCI, and using PUCCH after being activated by the MAC control element (MAC CE).

[0185] Non-periodic CSI reporting can be triggered by the "CSI request" field of the aforementioned DCI format 0_1, which corresponds to the scheduling DCI for PUSCH.

[0186] As another method to support ultra-high-speed data services, 5G systems can support signal transmission and reception with ultra-wide bandwidths of tens to hundreds of MHz or several GHz. This ultra-wide bandwidth signal transmission and reception can be supported through a single component carrier (CC) or through Carrier Aggregation (CA) technology, which combines multiple component carriers. Carrier aggregation technology enables ultra-high-speed data services by combining individual component carriers with relatively small bandwidths to increase the total frequency bandwidth, thereby enabling ultra-high-speed data services, in cases where a mobile operator has not secured a frequency bandwidth sufficient for providing ultra-high-speed data services through a single component carrier.

[0187] As mentioned above, the frequency bands utilized by 5G systems range from hundreds of MHz to tens of GHz.

[0188] FIG. 5 shows the interrelationship between frequency band, coverage, and bandwidth according to one embodiment of the present disclosure.

[0189] Figure 5 illustrates the frequency bands of the low band (501), mid band (502), high band (503), and ultra-high band (504). Generally, the lower the frequency band, the greater the coverage due to relatively less path loss, while the higher the frequency band, the smaller the coverage due to relatively higher path loss. In the low frequency band, frequencies available for mobile communication are fragmented, resulting in a small bandwidth, whereas in the high frequency band, it is relatively easy to secure wide bandwidth frequencies, making it suitable for ultra-high-speed data services. As mobile communication systems evolve, efforts are being made to discover and utilize new frequency bands. For example, the next-generation mobile communication system, 6G (6 th In generation mobile communication systems, the 7 to 15 GHz band, called the upper midband, is being considered as one of the candidate frequencies.

[0190] Generally, mobile operators can secure multiple frequency bands to provide mobile communication services to users. For example, a mobile operator can combine existing frequency bands for LTE systems with newly secured frequency bands for 5G systems to operate a combined LTE and 5G system (e.g., EN(EUTRAN-NR)-DC(dual connectivity)). As another example, a mobile operator can secure frequency bands for 5G systems across multiple bands and then combine the frequencies from those bands to provide mobile communication services via 5G CA. Similarly, a 6G mobile communication system can provide mobile communication services via 6G CA by combining 6G frequencies with existing 4G or 5G frequencies, or by combining 6G frequencies with each other.

[0191] As mentioned above, since characteristics such as coverage and bandwidth vary depending on the frequency band, there is a growing trend toward mobile communication services that combine multiple frequency bands rather than those relying on a single frequency band.

[0192] Dynamic spectrum sharing (DSS) is described below. A scenario in which signals from different communication systems are transmitted on overlapping frequencies within the same frequency band or frequency domain can be referred to as DSS or co-existence. The aforementioned different communication systems may include LTE, 5G, 6G, etc.

[0193] In a system operating a DSS composed of communication system 1 and communication system 2, the base station can adjust whether to schedule communication system 1 or communication system 2 for the terminal in accordance with changes in the traffic of communication system 1 and communication system 2. For example, communication system 1 may be 5G and communication system 2 may be 6G. In this case, the DSS can be used to promote the spread of 6G without additional frequency allocation by making the most of existing frequencies during the initial stages of 6G system installation, when 5G traffic gradually decreases and 6G traffic gradually increases. From the perspective of a telecommunications operator, operating the DSS allows for the efficient utilization of already secured frequencies without wasting them.

[0194] FIGS. 6 and 7 are drawings illustrating the concept of dynamic frequency sharing (DSS) according to one embodiment of the present disclosure.

[0195] Figure 6 shows an example where 5G and 6G systems overlap in the same frequency band.

[0196] Referring to FIG. 6, the base station can determine at least one of a time interval for scheduling 5G and a time interval for scheduling 6G based on the distribution of 5G traffic and 6G traffic. FIG. 6 illustrates an example in which 5G is scheduled during the T1 time interval and 6G is scheduled during the T2 time interval.

[0197] Figure 7 shows an example where 5G and 6G systems partially overlap in the frequency domain.

[0198] Referring to FIG. 7, an example is shown in which 5G is scheduled in the F1 frequency range of the T1 time interval, and 6G is scheduled in the F2 frequency range of the T1 time interval. Additionally, an example is shown in which 6G is scheduled in the F3 (= F1+F2) frequency range during the T2 time interval. In both FIG. 6 and FIG. 7, 5G and 6G share time / frequency resources, but by ensuring that 5G and 6G do not collide in time / frequency resources at any given moment, the degradation of transmission and reception performance can be minimized.

[0199] In the case of Figures 6 and 7 above, 5G and 6G are exemplified as using continuous time / frequency resources, but it is also possible for 5G and 6G to share time / frequency resources by separating them into RE units. For example, time / frequency resource sharing is possible by mapping the CSI-RS of the 5G system to certain REs and mapping the remaining time / frequency resources to 6G signals.

[0200] The main point of the present disclosure is to propose a method for accurately performing transmission and reception operations without confusion as to which the terminal is the signal of a communication system 1 or a communication system 2 is transmitted to mutually overlapping wireless resources through dynamic spectrum sharing (DSS), such that the signal of a specific communication system to be transmitted does not collide with the signal of another communication system at any moment in the wireless resources.

[0201] The present disclosure may include a plurality of embodiments, each of which may be implemented independently as it is distinguished for convenience to describe an implementation according to the present disclosure; however, all or part of the plurality of embodiments may be selectively combined and implemented as long as they are not mutually exclusive. Such combinations include various variations and modifications of the present invention and may be made in various ways depending on technical needs or application environments. Even if the plurality of embodiments use different approaches to achieve the purpose of the invention, they may be used simultaneously or complementarily as long as the embodiments of the present invention are not technically mutually exclusive. Such combinations may be varied depending on technical requirements or specific application cases, and the present invention may encompass various embodiments including such variations and combinations. Although the name of a 5G system is used to describe the embodiments of the present disclosure, this is merely an example and may be understood as a message that includes information or performs the same role as described below.

[0202] For the convenience of the following explanation, channels / signals of 5G systems are distinguished by adding "5G", and channels / signals of 6G systems are distinguished by adding "6G". For example, a PDCCH for 5G may be referred to as 5G PDCCH, and a PDCCH for 6G may be referred to as 6G PDCCH.

[0203] The operation of the system proposed in this disclosure is explained below through specific embodiments.

[0204] <1st Example>

[0205] The first embodiment describes a method for effectively performing transmission and / or reception of a 5G PDCCH or a 6G PDCCH when a mobile communication system is configured to transmit 5G or 6G signals to mutually overlapping wireless resources through a DSS.

[0206] At any given time, if a base station intends to send a 5G PDSCH to a 5G terminal, the base station may transmit a 5G PDCCH to the terminal to schedule the 5G PDSCH. Similarly, if a base station intends to send a 6G PDSCH to a 6G terminal at any given time, the base station may transmit a 6G PDCCH to schedule the 6G PDSCH. In this case, the base station may adjust the scheduling operation of the 5G PDCCH or the 6G PDSCH so that the 5G PDSCH and the 6G PDSCH do not overlap with each other.

[0207] In one embodiment, for 5G PDCCH and 6G PDCCH, the base station can reduce the complexity of the terminal's PDCCH reception by setting the wireless resources that the terminal needs to monitor in advance to the terminal. In a system where DSS is applied, the base station can set the wireless resources to which the 5G PDCCH and 6G PDCCH are mapped in the following way.

[0208] - Method 1: Wireless resources that can be mapped to 5G PDCCH and 6G PDCCH can be separated in the time domain so that they do not overlap each other (time division multiplexing, TDM). FIG. 8 shows an example of a method for setting up PDCCH wireless resources according to Method 1. In FIG. 8, the x-axis represents the time (t) domain, and the y-axis represents the frequency (f) domain. FIG. 8 illustrates a case where wireless resource #1 (810) for 5G PDCCH transmission and wireless resource #2 (820) for 6G PDCCH transmission are separated in the time domain and placed at the front of slot (801) so that they do not overlap each other.

[0209] - Method 2: Radio resources that can be mapped to 5G PDCCH and 6G PDCCH can be separated in the frequency domain so that they do not overlap each other (frequency division multiplexing, FDM). FIG. 9 shows an example of a method for setting up PDCCH radio resources according to Method 2. In FIG. 9, the x-axis represents the time (t) domain, and the y-axis represents the frequency (f) domain. FIG. 9 illustrates a case where radio resource #1 (910) for 5G PDCCH transmission and radio resource #2 (920) for 6G PDCCH transmission are separated in the frequency domain and placed in the front part of slot (901) so that they do not overlap each other.

[0210] - Method 3: Wireless resources that can be mapped to a 5G PDCCH and a 6G PDCCH can be made to overlap each other. FIG. 10 illustrates an example of a method for setting PDCCH wireless resources according to Method 3. In FIG. 10, the x-axis represents the time (t) domain, and the y-axis represents the frequency (f) domain. FIG. 10 illustrates a case where a wireless resource (1010) for 5G PDCCH transmission and a wireless resource (1010) for 6G PDCCH transmission are arranged to overlap each other in the front part of a slot (1001).

[0211] In one embodiment, information regarding a radio resource to which a 5G PDCCH and / or 6G PDCCH can be mapped may be information including at least some of the CORESET-related control information described above. For example, it may be information including at least one of the specific control information in described above. A base station may notify a terminal of the control information through signaling. A base station may notify the terminal of whether the CORESET-related control information is CORESET#0 required for the terminal's initial connection.

[0212] In one embodiment, information regarding a radio resource to which a 5G PDCCH and / or 6G PDCCH can be mapped may be information including at least some of the control information related to the PDCCH search space described above. For example, it may be information including at least one of the specific control information in described above. In one embodiment, a base station may notify a terminal of the control information through signaling. In one embodiment, a base station may notify the terminal of whether the control information related to the PDCCH search space is search space #0 required for the terminal's initial connection.

[0213] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names PDCCH, PDSCH, CORESET, etc. described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0214] <2nd Example>

[0215] The second embodiment describes a method for mitigating inter-cell interference when configuring a mobile communication system to transmit 5G or 6G signals to mutually overlapping wireless resources through DSS. FIG. 11 is a diagram illustrating an example of inter-cell interference occurring in a system where DSS is applied.

[0216] In FIG. 11, the x-axis represents the time (t) domain, and the y-axis represents the frequency (f) domain. FIG. 11 shows that cell 1 (1101) and cell 2 (1102) are located adjacent to each other, and that a base station transmits a 5G PDCCH (1110) and a 5G PDCCH DMRS (1112) from cell 1 over the first two symbols within slot (1102), and that a base station transmits a 6G PDCCH (1120) and a 6G PDCCH DMRS (1122) from cell 2. The PDCCH DMRS (Demodulation Reference Signal) is a pre-agreed reference signal, and a terminal can measure the PDCCH DMRS to perform channel estimation for the PDCCH and decode the PDCCH. In addition, to improve the channel estimation performance of the terminal through PDCCH DMRS, PDCCH DMRS may be additionally mapped to some RBs in addition to the RBs to which PDCCH and PDCCH DMRS are mapped (for convenience of explanation below, the RBs to which PDCCH DMRS is additionally mapped may be referred to as PDCCH DMRS RBs).

[0217] FIG. 11 illustrates an example in which a 5G PDCCH (1110) and a 5G PDCCH DMRS (1112) transmitted from cell 1 (1101) and a 6G PDCCH (1120) and a 6G PDCCH DMRS (1122) transmitted from cell 2 (1102) overlap in the time and frequency domains, causing inter-cell interference (1130). In a situation like FIG. 11, if the amount of interference increases, a side effect may occur in which the PDCCH reception performance of the terminal deteriorates. The second embodiment can solve the problem described above through the following 6G PDCCH and 6G PDCCH DMRS transmission method.

[0218] - Method A: Frequency domain mapping locations of 6G PDCCH DMRS and frequency domain mapping locations of 5G PDCCH DMRS can be arranged so that they do not overlap at the subcarrier level. For example, if the mapping locations of 5G PDCCH DMRS are represented in the form (l, k) with symbol index l and subcarrier index k (l = 0, 1, 2, ..., k = 0, 1, 2, ...), and the mapping locations of 6G PDCCH DMRS are represented in the form (l', k') with symbol index l' and subcarrier index k' (l' = 0, 1, 2, ..., k' = 0, 1, 2, ...), the relationship l ≠ l' or k ≠ k' can be satisfied.

[0219] Through Method A, the 5G PDCCH DMRS and the 6G PDCCH DMRS are not overlapped at least in the frequency domain, and thus the effect of mitigating the adjacent cell interference can be achieved. The interference mitigation effect can be particularly pronounced in the PDCCH DMRS RB.

[0220] Referring to Fig. 12, an example of a PDCCH DMRS mapping location to which Method A is applied is as follows.

[0221] ■ 5G PDCCH DMRS Mapping Locations (l, k) = (0,1) (1,1) (Reference No. 1214), (0,5) (1, 5) (Reference No. 1213), (0,9) (1,9) (Reference No. 1212)

[0222] ■ 6G PDCCH DMRS Mapping Locations (l', k') = (0,0) (1,0) (Reference No. 1224), (0, 4) (1, 4) (Reference No. 1223), (0, 8) (1, 8) (Reference No. 1222)

[0223] ■ Generalizing Figure 12, it can be expressed as k' = k - 1.

[0224] Figure 13 shows another example of a PDCCH DMRS mapping location to which Method A is applied.

[0225] ■ 5G PDCCH DMRS Mapping Locations (l, k) = (0,1) (1,1) (Reference No. 1314), (0,5) (1, 5) (Reference No. 1313), (0,9) (1,9) (Reference No. 1312)

[0226] ■ 6G PDCCH DMRS Mapping Locations (l', k') = (0,2) (1,2) (Reference No. 1324), (0, 6) (1, 6) (Reference No. 1233), (0, 10) (1, 10) (Reference No. 1232)

[0227] ■ Generalizing Figure 13, it can be expressed as k' = k + 1.

[0228] Figure 14 shows another example of a PDCCH DMRS mapping location to which Method A is applied.

[0229] ■ 5G PDCCH DMRS Mapping Locations (l, k) = (0,1) (1,1) (Reference No. 1414), (0,5) (1, 5) (Reference No. 1413), (0,9) (1,9) (Reference No. 1412)

[0230] ■ 6G PDCCH DMRS Mapping Locations (l', k') = (0,3) (1,3) (Reference No. 1424), (0, 7) (1, 7) (Reference No. 1433), (0, 11) (1, 11) (Reference No. 1432)

[0231] ■ Generalizing Fig. 14, it can be expressed as k' = k + 2.

[0232] Method A can be applied when the amount of resources used for the PDCCH DMRS per RB of the 5G PDCCH DMRS and the 6G PDCCH DMRS is the same. In the examples of FIGS. 12, 13, and 14 above, the amount of resources used for the PDCCH DMRS per RB represents the case where it is 3 RE (resource element).

[0233] - Method B: Another method for arranging the frequency domain mapping locations of the 6G PDCCH DMRS and the 5G PDCCH DMRS so that they do not overlap at the subcarrier level. Method B can be applied when the amount of resources used per RB for the PDCCH DMRS of the 5G PDCCH DMRS and the 6G PDCCH DMRS is different. The examples in FIGS. 15, 16, and 17 below represent the case where the amount of resources used per RB for the 5G PDCCH DMRS is 3 RE (resource element) and the amount of resources used per RB for the 6G PDCCH DMRS is 4 RE.

[0234] Referring to Fig. 15, an example of a PDCCH DMRS mapping location to which Method B is applied is as follows.

[0235] ■ 5G PDCCH DMRS Mapping Locations (l, k) = (0,1) (1,1) (Reference No. 1514), (0,5) (1, 5) (Reference No. 1513), (0,9) (1,9) (Reference No. 1512)

[0236] ■ 6G PDCCH DMRS Mapping Locations (l', k') = (0,0) (1,0) (Reference No. 1525), (0, 3) (1, 3) (Reference No. 1524), (0, 6) (1, 6) (Reference No. 1523), (0, 9) (1, 9) (Reference No. 1522)

[0237] Figure 15 illustrates a case (1530) in which 5G PDCCH DMRS (reference number 1512) and 6G PDCCH DMRS (reference number 1522) inevitably overlap and cause interference with each other.

[0238] Figure 16 shows another example of a PDCCH DMRS mapping location to which method B is applied.

[0239] ■ 5G PDCCH DMRS Mapping Locations (l, k) = (0,1) (1,1) (Reference No. 1614), (0,5) (1, 5) (Reference No. 1613), (0,9) (1,9) (Reference No. 1612)

[0240] ■ 6G PDCCH DMRS Mapping Locations (l', k') = (0,1) (1,1) (Reference No. 1625), (0, 4) (1, 4) (Reference No. 1624), (0, 7) (1, 7) (Reference No. 1623), (0, 10) (1, 10) (Reference No. 1622)

[0241] Figure 16 illustrates a case (1630) in which 5G PDCCH DMRS (reference number 1614) and 6G PDCCH DMRS (reference number 1625) inevitably overlap and cause interference with each other.

[0242] Figure 17 shows another example of a PDCCH DMRS mapping location to which method B is applied.

[0243] ■ 5G PDCCH DMRS Mapping Locations (l, k) = (0,1) (1,1) (Reference No. 1714), (0,5) (1, 5) (Reference No. 1713), (0,9) (1,9) (Reference No. 1712)

[0244] ■ 6G PDCCH DMRS Mapping Locations (l', k') = (0,2) (1,2) (Reference No. 1725), (0, 5) (1, 5) (Reference No. 1724), (0, 8) (1, 8) (Reference No. 1723), (0, 11) (1, 11) (Reference No. 1722)

[0245] Figure 17 illustrates a case (1730) in which the 5G PDCCH DMRS (reference number 1713) and the 6G PDCCH DMRS (reference number 1724) inevitably overlap and cause interference with each other.

[0246] The frequency domain mapping location of the PDCCH DMRS described above can be made to have a common understanding between the base station and the terminal in the following way.

[0247] - Method 1: The base station and the terminal can apply a PDCCH DMRS frequency domain mapping location that they have agreed upon in advance.

[0248] - Method 2: The PDCCH DMRS frequency domain mapping location can be calculated in conjunction with the cell ID of the cell transmitting the PDCCH DMRS. Therefore, this has the effect of randomizing the frequency domain mapping location of the PDCCH DMRS for each cell. For example, k' = k + (cell ID % d). If the calculation result is k' = k, it can be updated to k' = k + 1 to avoid overlap. Here, x % y represents the remainder when x is divided by y, and d represents the subcarrier spacing in the frequency domain of the PDCCH DMRS. Figure 12 above illustrates an example where d = 4.

[0249] - Method 3: The PDCCH DMRS frequency domain mapping location can be calculated in conjunction with the time at which the PDCCH DMRS is transmitted. Therefore, this has the effect of randomizing the frequency domain mapping location of the PDCCH DMRS whenever it is transmitted. For example, k' = k + (slot index % d). If the calculation result is k' = k, it can be updated to k' = k + 1 to avoid overlap. The slot index represents the index of the slot in which the PDCCH DMRS is transmitted.

[0250] - Method 4: The base station can inform the terminal of the PDCCH DMRS frequency domain mapping location through signaling.

[0251] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names such as PDCCH, PDCCH DMRS described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0252] <3rd Example>

[0253] A third embodiment describes a method for mitigating interference by utilizing an advanced receiver of a terminal when configuring a mobile communication system to transmit 5G or 6G signals to mutually overlapping wireless resources through DSS.

[0254] A terminal equipped with a high-performance receiver according to the third embodiment may refer to a terminal equipped with an interference cancellation function that eliminates received signals acting as interference through a high-performance signal processing technique. Accordingly, the terminal can improve reception performance through interference cancellation processing for 5G signals and 6G signals received overlapping in wireless resources. Therefore, when a base station schedules the terminal, it may allow the 5G signals and 6G signals to overlap in wireless resources.

[0255] In one embodiment, the signal received superimposed on the wireless resource may include at least one of the following cases.

[0256] ■ 5G PDCCH and 6G PDCCH

[0257] ■ 5G PDCCH DMRS and 6G PDCCH DMRS

[0258] ■ 5G PDSCH and 6G PDSCH

[0259] ■ 5G PDCCH and 6G PDSCH

[0260] ■ 5G PDSCH and 6G PDSCH

[0261] In one embodiment, the interference cancellation function of the terminal may include the following two cases.

[0262] - Intra-cell interference cancellation: A terminal may receive both 5G signals and 6G signals that overlap with wireless resources, and these signals may be signals received from the cell currently being serviced by the terminal. Among these, the 6G signal is a signal for the terminal, and the 5G signal is a signal for another terminal, and may act as interference to the terminal. Alternatively, the 5G signal is a signal for the terminal, and the 6G signal is a signal for another terminal, and may act as interference to the terminal.

[0263] - Inter-cell interference cancellation: Among the 5G and 6G signals received by the terminal overlapping with wireless resources, one may be a signal received from the cell currently being serviced by the terminal, and the other may be a signal acting as interference received from a neighboring cell.

[0264] In one embodiment, a terminal equipped with the interference cancellation function may support the scheduling operation of a base station by including the relevant fact in UE capability signaling and reporting it to the base station. In one embodiment, the information regarding the interference cancellation function of the terminal included in the UE capability signaling may include at least one of the following.

[0265] - Support for interference cancellation function for 5G PDCCH DMRS

[0266] - Support for interference cancellation function for 5G PDCCH

[0267] - Whether interference cancellation is supported for the 5G PDCCH of CORESET#0 required for initial terminal connection

[0268] - Support for interference cancellation function for 6G PDCCH DMRS

[0269] - Support for interference cancellation for 6G PDCCH

[0270] - Whether interference cancellation is supported for the 6G PDCCH of CORESET#0 required for initial terminal connection

[0271] - Support for interference cancellation for 5G PDSCH

[0272] - Support for interference cancellation for 6G PDSCH

[0273] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names PDCCH, PDCCH DMRS, PDSCH, etc. described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0274] <Fourth Example>

[0275] In the fourth embodiment, an example of a terminal procedure and a base station procedure according to a preferred embodiment of the present invention is described. The terminal procedure and the base station procedure of the fourth embodiment may be performed in combination with at least one of the first to third embodiments.

[0276] FIG. 18 illustrates an example of terminal operation according to one embodiment of the present disclosure.

[0277] FIG. 18 is a diagram illustrating an example of a terminal procedure for applying a mobile communication system configured and operated according to an embodiment of the present invention, wherein a base station can transmit a signal of a first communication system or a signal of a second communication system to mutually overlapping wireless resources. It is assumed that the first communication system is configured as 5G and the second communication system is configured as 6G.

[0278] In step 1801, the terminal can obtain PDCCH configuration information from the base station. In one embodiment, the terminal can receive radio resource information for the PDCCH transmission of the base station described above from the base station.

[0279] In step 1802, the terminal can determine a wireless resource mapping method. In one embodiment, the terminal can determine a wireless resource mapping method for the PDCCH and PDCCH DMRS by referring to the information obtained in step 1801. According to one embodiment, the 5G PDCCH and 5G PDCCH DMRS and the 6G PDCCH and 6G PDCCH DMRS can be made so that they do not overlap each other at least at the subcarrier level in the frequency domain.

[0280] In step 1803, the terminal can receive a 6G signal. In one embodiment, the terminal can receive the 6G PDCCH and 6G PDCCH DMRS according to the mapping method of the determined 6G PDCCH and 6G PDCCH DMRS. According to one embodiment, even if the 5G PDCCH and 5G PDCCH DMRS and the 6G PDCCH and 6G PDCCH DMRS overlap with each other, the terminal can improve the reception performance of the 6G PDCCH and 6G PDCCH DMRS by utilizing an interference cancellation function.

[0281] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to perform the present invention. In one embodiment, prior to or after step 1801, the terminal may signal control information indicating that it is equipped with an interference cancellation function to the base station to support the scheduling operation of the base station.

[0282] FIG. 19 is a diagram illustrating an example of a base station procedure for applying a mobile communication system configured and operated according to an embodiment of the present invention, wherein the base station can transmit a signal of a first communication system or a signal of a second communication system to mutually overlapping wireless resources. It is assumed that the first communication system is configured as 5G and the second communication system is configured as 6G.

[0283] In step 1901, the base station may transmit PDCCH configuration information. In one embodiment, the base station may transmit radio resource information for the PDCCH transmission of the base station described above to the terminal.

[0284] In step 1902, the base station can determine whether to transmit 5G and 6G signals. In one embodiment, the base station can determine whether to transmit 5G signals and 6G signals over mutually overlapping wireless resources. The base station can determine whether to transmit 5G signals and 6G signals by referring to the presence or absence of a terminal or traffic to be serviced. According to one embodiment, when the base station transmits 5G signals and 6G signals, it can transmit them such that at least the 5G PDCCH DMRS and 6G PDCCH DMRS do not overlap each other at the subcarrier level. According to one embodiment, if the terminal is equipped with an interference cancellation function, the base station can transmit 5G signals and 6G signals to the terminal over the overlapping wireless resources.

[0285] In step 1903, the base station can schedule a 6G signal. In one embodiment, the base station can schedule a 6G signal to the terminal by referring to the result of the determination in step 1902.

[0286] The steps described above may be modified, omitted, changed in order, or additional steps not described may be added to perform the present invention. In one embodiment, prior to or after step 1901, the base station may obtain control information from the terminal indicating that the terminal is equipped with an interference cancellation function, and may use this information as a reference for the base station's scheduling operation.

[0287] In the embodiments described above, in addition to signaling between a base station and a terminal, signaling between base stations may be additionally defined and operated. For example, just as a base station supports terminal operation by transmitting radio resource information for the PDCCH transmission and / or PDCCH DMRS transmission of the base station described above to a terminal, a base station may support the scheduling operation of an adjacent base station by providing one or more adjacent base stations with radio resource information for the PDCCH transmission and / or PDCCH DMRS transmission of the base station or corresponding information. The adjacent base stations may use the provided information to schedule terminals within the base station or to control interference between base stations.

[0288] In the first, second, and third embodiments above, when the units of time-frequency radio resources of the 5G system and the 6G system are identical, the mutual utilization of radio resources can be enhanced. For example, effective operation can be expected when the subcarrier spacing applied by the 5G system and the 6G system are identical, the time domain intervals for scheduling (symbols, slots, subframes, or frame boundaries) coincide with each other, and the frequency domain intervals for scheduling (RBs and RB group boundaries) coincide with each other. However, even if the subcarrier spacing applied by the two systems is different, efficient use of radio resources is possible if at least the subcarrier spacings maintain a difference of an integer multiple of N, and the time or frequency domain boundaries also coincide within an integer multiple relationship of N.

[0289] FIG. 20 is a drawing illustrating an example of a terminal transceiver in a wireless communication system according to an embodiment of the present disclosure. For convenience of explanation, devices not directly related to the present disclosure may be omitted from illustration and description.

[0290] Referring to FIG. 20, the terminal may be configured to include at least one of a transmitter (2004) composed of an uplink transmission processing block (2001), a multiplexer (2002), and a transmission RF block (2003), a receiver (2008) composed of a downlink reception processing block (2005), a demultiplexer (2006), and a reception RF block (2007), and a control unit (2009). The control unit (2009) can control each of the respective blocks of the receiver (2008) for receiving at least one of the data channel or control channel transmitted by the base station as described above, and at least one of the respective blocks of the transmitter (2004) for transmitting an uplink signal.

[0291] In the transmission unit (2004) of the terminal, the uplink transmission processing block (2001) 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 (2001) can be multiplexed with other uplink signals by a multiplexer (2002), then processed by a transmission RF block (2003), and then transmitted to a base station.

[0292] The receiving unit (2008) of the terminal can demultiplex a signal received from a base station and distribute it to each downlink receiving processing block. The downlink receiving processing block (2005) can obtain control information or data transmitted by the base station by performing processes such as demodulation and channel decoding on the downlink signal of the base station. The receiving unit (2008) of the terminal can apply the output result of the downlink receiving processing block to the control unit (2009) to support the operation of the control unit (2009).

[0293] FIG. 21 is a block diagram showing an example of the configuration of a terminal according to one embodiment of the present disclosure.

[0294] As illustrated in FIG. 21, the terminal of the present disclosure may include at least one of a processor (2130), a transceiver (2110), or a memory (2120). However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more components or fewer components than the components described above. Furthermore, the processor (2130), the transceiver (2110), and the memory (2120) may be implemented in the form of a single chip. According to one embodiment, the transceiver (2110) of FIG. 21 may include the transceiver (2004) and the receiver (2008) of FIG. 20. Additionally, the processor (2130) of FIG. 212 may include the control unit (2009) of FIG. 20.

[0295] According to one embodiment, the processor (2130) can control a series of processes that allow the terminal to 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 terminal can be controlled to perform a transmission and reception method of the terminal according to the PDCCH settings and / or PDCCH DMRS settings of the base station. The processor (2130) may include at least one processor, and the processor (2130) can perform a transmission and reception operation of the terminal in a wireless communication system applying the operation of the aforementioned present disclosure by executing a program stored in memory (2120).

[0296] The transceiver (2110) can transmit and receive signals with a base station. The signals transmitted and received with the base station may include at least one of control information and data. The transceiver (2110) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver (2110), and the components of the transceiver (2110) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (2110) can receive a signal through a wireless channel and output it to a processor (2130), and transmit the signal output from the processor (2130) through a wireless channel.

[0297] According to one embodiment, the memory (2120) may store programs and data necessary for the operation of the terminal. Additionally, the memory (2120) may store control information and / or data included in signals transmitted and received by the terminal. The memory (2120) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memory (2120). According to one embodiment, the memory (2120) may store a program for performing the transmission and reception operation of the terminal according to the PDCCH settings and / or PDCCH DMRS settings of the base station, which are embodiments of the present disclosure described above.

[0298] FIG. 22 is a block diagram showing an example of the configuration of a base station according to one embodiment of the present disclosure.

[0299] As illustrated in FIG. 22, the base station of the present disclosure may include at least one of a processor (2230), a transceiver (2210), or a memory (2220). However, the components of the base station are not limited to the examples described above. For example, the base station may include more components or fewer components than the components described above. In addition, the processor (2230), the transceiver (2210), and the memory (2220) may be implemented in the form of a single chip.

[0300] The processor (2230) can control a series of processes to enable the base station to 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 according to the PDCCH settings and / or PDCCH DMRS settings of the base station. The processor (2230) may include at least one processor, and the processor (2230) can perform a method of scheduling a terminal according to the frequency instructions of the base station of the present disclosure described above by executing a program stored in memory (2220).

[0301] The transceiver (2210) can transmit and receive signals with a terminal. The signals transmitted and received with the terminal may include at least one of control information and data. The transceiver (2210) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver (2210), and the components of the transceiver (2210) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (2210) can receive a signal through a wireless channel and output it to a processor (2230), and transmit the signal output from the processor (2230) through a wireless channel.

[0302] According to one embodiment, the memory (2220) may store programs and data necessary for the operation of the base station. Additionally, the memory (2220) may store control information and / or data included in signals transmitted and received by the base station. The memory (2220) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memory (2220). According to one embodiment, the memory (2220) may store a program for performing a method of scheduling a terminal according to the PDCCH settings and / or PDCCH DMRS settings of the base station, which are embodiments of the present disclosure described above.

[0303] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0304] Meanwhile, the present specification and drawings disclose preferred embodiments of the present disclosure. Although specific terms have been used, they are used merely in a general sense to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the invention, and are not intended to limit the scope of the present disclosure. It is obvious to those skilled in the art that, in addition to the embodiments disclosed herein, other variations based on the technical concept of the present disclosure may be implemented. Furthermore, each of the above embodiments may be combined and operated together as needed. For example, the first, second, and third embodiments may be implemented independently, or at least one of the embodiments may be combined and implemented together.

[0305] Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, it is understood that various modifications are possible within the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving control channel related configuration information from a base station; A step of determining wireless resources to which the PDCCH (physical downlink control channel) and PDCCH DMRS (demodulation reference signal) of the first communication system and the PDCCH and PDCCH DMRS of the second communication system are mapped, as indicated by the control channel-related setting information; and The method includes the step of receiving the PDCCH and PDCCH DMRS of the first communication system from the base station based on the determined wireless resources; A method characterized in that a first radio resource for receiving a PDCCH DMRS of the first communication system and a second radio resource for receiving a PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

2. In Paragraph 1, A method characterized in that a first radio resource for receiving a PDCCH DMRS of the first communication system and a second radio resource for receiving a PDCCH DMRS of the second communication system do not overlap each other in a frequency-dimensional subcarrier unit.

3. In paragraph 1, the PDCCH and PDCCH DMRS of the first communication system are transmitted from the first cell, and A method characterized in that the PDCCH and PDCCH DMRS of the second communication system are transmitted from the second cell.

4. A method according to claim 1, characterized in that the first communication system is a 6G (6th generation) communication system, and the second communication system is one of 5G (5th generation) or LTE (long term evolution).

5. In a method performed by a base station in a wireless communication system, A step of transmitting control channel-related configuration information to a terminal—the control channel-related configuration information represents wireless resources to which the PDCCH (physical downlink control channel) and PDCCH DMRS (demodulation reference signal) of the first communication system and the PDCCH and PDCCH DMRS of the second communication system are mapped—; The method includes the step of transmitting the PDCCH and PDCCH DMRS of the first communication system to the terminal based on wireless resources to which the PDCCH and PDCCH DMRS of the first communication system are mapped; A method characterized in that a first radio resource for receiving a PDCCH DMRS of the first communication system and a second radio resource for receiving a PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

6. In Paragraph 5, A method characterized in that a first radio resource for receiving a PDCCH DMRS of the first communication system and a second radio resource for receiving a PDCCH DMRS of the second communication system do not overlap each other in a frequency-dimensional subcarrier unit.

7. In paragraph 5, the PDCCH and PDCCH DMRS of the first communication system are transmitted from the first cell, and A method characterized in that the PDCCH and PDCCH DMRS of the second communication system are transmitted from the second cell.

8. A method according to claim 5, characterized in that the first communication system is a 6G (6th generation) communication system, and the second communication system is one of 5G (5th generation) or LTE (long term evolution).

9. In a terminal of a wireless communication system, Transmitter / receiver; and It includes at least one processor; and the at least one processor, Receive control channel related configuration information from the base station, and Determining wireless resources to which the PDCCH (physical downlink control channel) and PDCCH DMRS (demodulation reference signal) of the first communication system and the PDCCH and PDCCH DMRS of the second communication system are mapped, as indicated by the above control channel related setting information, and It is configured to receive the PDCCH and PDCCH DMRS of the first communication system from the base station based on the determined wireless resources, and A terminal characterized in that a first wireless resource for receiving the PDCCH DMRS of the first communication system and a second wireless resource for receiving the PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

10. In Paragraph 9, A terminal characterized in that the first radio resource for receiving the PDCCH DMRS of the first communication system and the second radio resource for receiving the PDCCH DMRS of the second communication system do not overlap with each other in the frequency dimension subcarrier unit.

11. In paragraph 9, the PDCCH and PDCCH DMRS of the first communication system are transmitted from the first cell, and A terminal characterized in that the PDCCH and PDCCH DMRS of the second communication system are transmitted from the second cell.

12. A terminal according to claim 9, characterized in that the first communication system is a 6G (6th generation) communication system, and the second communication system is one of 5G (5th generation) or LTE (long term evolution).

13. In a base station of a wireless communication system, Transmitter / receiver; and It includes at least one processor; and the at least one processor, Transmitting control channel related configuration information to a terminal—the control channel related configuration information represents wireless resources to which the PDCCH (physical downlink control channel) and PDCCH DMRS (demodulation reference signal) of the first communication system and the PDCCH and PDCCH DMRS of the second communication system are mapped—, and The above terminal is configured to transmit the PDCCH and PDCCH DMRS of the first communication system based on wireless resources to which the PDCCH and PDCCH DMRS of the first communication system are mapped, and A base station characterized in that the first radio resource for receiving the PDCCH DMRS of the first communication system and the second radio resource for receiving the PDCCH DMRS of the second communication system overlap each other in the time dimension and do not overlap each other in the frequency dimension.

14. In Paragraph 13, A base station characterized in that the first radio resource for receiving the PDCCH DMRS of the first communication system and the second radio resource for receiving the PDCCH DMRS of the second communication system do not overlap with each other in the frequency dimension subcarrier unit.

15. In paragraph 13, the PDCCH and PDCCH DMRS of the first communication system are transmitted from the first cell, and The PDCCH and PDCCH DMRS of the second communication system are transmitted from the second cell, and A base station characterized in that the first communication system is a 6G (6th generation) communication system, and the second communication system is one of 5G (5th generation) or LTE (long term evolution).

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