Method and device for transmitting and receiving control information for supporting multiple types of terminals in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure proposes a method for allowing various types of terminals to effectively perform initial access procedures. A method performed by a user equipment (UE) in a wireless communication system according to an embodiment of the present disclosure comprises the steps of: receiving a physical broadcast channel (PBCH) from a base station, the PBCH including physical downlink control channel (PDCCH) configuration information; acquiring the PDCCH configuration information based on the terminal type of the UE; and receiving a PDCCH associated with the terminal type from the base station on the basis of the acquired PDCCH configuration information, wherein the terminal type indicates one of a plurality of terminal types having different transmission / reception bandwidths.

Description

Method and apparatus for transmitting and receiving control information to support heterogeneous terminals in a wireless communication system

[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 included 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; the 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 the 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, various types of terminals can effectively perform an initial connection procedure.

[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 UE (user, equipment) in a wireless communication system according to one embodiment of the present disclosure comprises: receiving a PBCH (physical broadcast channel) from a base station—the PBCH includes PDCCH (physical downlink control channel) configuration information—; obtaining the PDCCH configuration information based on the terminal type of the UE; and receiving a PDCCH related to the terminal type from the base station based on the obtained PDCCH configuration information; wherein the terminal type represents one of a plurality of terminal types having different transmission and reception bandwidths.

[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 a physical broadcast channel (PBCH)—the PBCH includes physical downlink control channel (PDCCH) configuration information—; and a step of transmitting a plurality of PDCCHs related to a plurality of terminal types having different transmission and reception bandwidths based on the PDCCH configuration information.

[0013] In a wireless communication system according to one embodiment of the present disclosure, a user equipment (UE) comprises at least one transceiver; one or more processors; and a memory for storing instructions, wherein when the instructions are executed individually or collectively by the one or more processors, the UE: receives a physical broadcast channel (PBCH) from a base station—the PBCH includes physical downlink control channel (PDCCH) configuration information—; obtains the PDCCH configuration information based on the terminal type of the UE; and causes the UE to receive a PDCCH associated with the terminal type from the base station based on the obtained PDCCH configuration information, wherein the terminal type represents one of a plurality of terminal types with different transmission and reception bandwidths.

[0014] In a wireless communication system according to one embodiment of the present disclosure, a base station comprises at least one transceiver; one or more processors; and a memory for storing instructions, wherein when the instructions are executed individually or collectively by the one or more processors, the base station: transmits a physical broadcast channel (PBCH)—the PBCH includes physical downlink control channel (PDCCH) configuration information—; and causes a plurality of PDCCHs associated with a plurality of terminal types having different transmission and reception bandwidths based on the PDCCH configuration information.

[0015] The various embodiments of the present disclosure described above are merely some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by those skilled in the art based on the detailed description to be described below.

[0016] Embodiments of the present disclosure provide a transceiver device and method for a terminal and a base station that improve frequency usage efficiency in a mobile communication system. Specifically, according to at least one embodiment of the present disclosure, various types of terminals can effectively perform an initial connection procedure.

[0017] 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.

[0018] 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.

[0019] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0020] 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.

[0021] FIG. 4 is a drawing showing an example of a bandwidth portion setting according to one embodiment of the present disclosure.

[0022] FIG. 5 is a diagram showing the interrelationship between frequency bands and coverage according to one embodiment of the present disclosure.

[0023] FIG. 6 is a diagram showing the relationship between PBCH and PDCCH by terminal type according to one embodiment of the present disclosure.

[0024] FIG. 7 is another diagram showing the relationship between PBCH and PDCCH by terminal type according to one embodiment of the present disclosure.

[0025] FIG. 8 is a diagram showing an example of an initial connection procedure of a terminal according to one embodiment of the present disclosure.

[0026] FIG. 9 is a diagram showing an example of a base station procedure for supporting a terminal initial connection procedure according to one embodiment of the present disclosure.

[0027] FIG. 10 is a diagram showing the relationship between a PBCH and a PDCCH by terminal type according to one embodiment of the present disclosure.

[0028] FIG. 11 is a diagram showing another example of an initial connection procedure of a terminal according to one embodiment of the present disclosure.

[0029] FIGS. 12a, FIGS. 12b, FIGS. 12c, FIGS. 12d, FIGS. 12e and FIGS. 12f are drawings illustrating an initial connection method between a terminal and a base station according to one embodiment of the present disclosure.

[0030] FIG. 13 is a drawing showing a terminal transceiver device according to one embodiment of the present disclosure.

[0031] FIG. 14 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0032] FIG. 15 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0033] Hereinafter, embodiments of the present disclosure will be described in detail 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 might 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 conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0034] 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. The embodiments provided are 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, the same reference numerals refer to the same components.

[0035] At this point, 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 create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can 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 can also produce a manufactured item containing the means of instruction to perform 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).

[0036] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also 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.

[0037] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), 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 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.

[0038] 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 components in any other aspect (e.g., importance or order).

[0039] In describing the present disclosure below, if it is determined that a detailed description of related known functions or configurations could unnecessarily obscure the essence of the present disclosure, such detailed description will be omitted. Embodiments of the present disclosure will be described below with reference to the attached drawings.

[0040] 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.

[0041] 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."

[0042] In the present disclosure, upper layer signaling refers 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 can 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).

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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, which can result in a smaller coverage area for mobile communication systems.

[0048] To overcome the disadvantage of reduced coverage in the ultra-high frequency band, beamforming technology can be applied. This technology uses multiple antennas to concentrate radio wave radiation energy toward a specific target point, thereby increasing the propagation range. In other words, a signal to which beamforming technology is applied has a relatively narrower beam width, and as radiation energy is concentrated within this narrowed beam width, the propagation range is increased. Beamforming technology can be applied to both the transmitting and receiving ends. In addition to the effect of increasing coverage, beamforming technology also has the effect of reducing interference in areas outside the beamforming direction. For beamforming technology to operate properly, accurate measurement and feedback methods for the transmit and receive beams are required. Beamforming technology can be applied to control channels or data channels that correspond one-to-one between a specific terminal and a base station. Furthermore, beamforming technology can be applied to control and data channels used to transmit common signals—such as synchronization signals, physical broadcast channels (PBCH), and system information—that a base station transmits to multiple terminals within the system, in order to increase coverage. When applying beamforming technology to a common signal, beam sweeping technology, which changes the beam direction to transmit the signal, is additionally applied to ensure that the common signal reaches terminals located at any position within the cell.

[0049] 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.

[0050] 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.

[0051] That is, Figure 1 is a diagram showing the basic structure of the time-frequency resource area, which is a wireless resource area where data or control channels of a 5G system are transmitted.

[0052] 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 10 ms frame (114). 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 BWIt can be composed of several subcarriers (104).

[0053] 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.

[0054] 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.

[0055] OFDM symbol count It is 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.

[0056] In 5G systems, various frame structures can be supported by adjusting the subcarrier spacing to satisfy diverse services and requirements. For example,

[0057] From the perspective of the operating frequency band, a larger subcarrier spacing is advantageous for recovering phase noise in the high-frequency band.

[0058] - 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.

[0059] - 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. In mobile communication, a cell is a concept referring to the area covered by a single base station.

[0060] 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.

[0061]

[0062] [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 ( Represents an example of ).

[0063]

[0064] [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 ).

[0065]

[0066] 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).

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] MIB ::= SEQUENCE {

[0074] systemFrameNumber BIT STRING (SIZE (6));

[0075] subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120},

[0076] ssb-SubcarrierOffset INTEGER (0..15);

[0077] dmrs-TypeA-Position ENUMERATED {pos2, pos3},

[0078] pdcch-ConfigSIB1 PDCCH-ConfigSIB1,

[0079] cellBarred ENUMERATED {barred, notBarred},

[0080] intraFreqReselection ENUMERATED {allowed, notAllowed},

[0081] spare BIT STRING (SIZE (1))

[0082] }

[0083] 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.

[0084] 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). The control information may be configuration information for each channel or signal. The system information may be referred to, for example, as SIB1 or RMSI (remaining minimum system information).

[0085] 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.

[0086] 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.

[0087] 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 to a connected state (connected state or RRC_CONNECTED state). Upon 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 random access procedure will be described in detail below with reference to FIG. 2.

[0088] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0089] 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.

[0090] 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, or 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.

[0091] If the terminal does not receive message 2, which is scheduling information for message 3, from the base station within a predetermined time during the second step (220), the first step (210) can be performed again. If the first step (210) is performed again, the terminal can increase the probability of receiving the random access preamble by the base station by increasing the transmission power of the random access preamble by a predetermined step (power ramping).

[0092] 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.

[0093] 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).

[0094] 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).

[0095] 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.

[0096] 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 receives UE capability information from the connected terminal and can adjust scheduling by referring to that information. Through the UE capability information, the terminal can inform the base station whether it supports specific functions and / or the maximum allowable value of the functions it supports. Therefore, the UE capability information reported by each terminal to the base station may vary depending on the terminal.

[0097] 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.

[0098] - Control information related to the frequency bands supported by the terminal

[0099] - Control information related to channel bandwidth supported by the terminal

[0100] - Control information regarding the maximum modulation scheme supported by the terminal

[0101] - Control information regarding the maximum number of beams supported by the terminal

[0102] - Control information regarding the maximum number of layers supported by the terminal

[0103] - Control information related to CSI reporting supported by the terminal

[0104] - Control information on whether the terminal supports frequency hopping

[0105] - Bandwidth-related control information when Carrier Aggregation (CA) is supported

[0106] - Control information on whether cross-carrier scheduling is supported when carrier bundling is supported

[0107] 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.

[0108] 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.

[0109] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0110] 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.

[0111] 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.

[0112]

[0113] 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 DCI.

[0114] 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 for a Control Resource Set (CORESET) and a Search Space via the MIB, through which a PDCCH for receiving System Information Blocks required for initial connection can be transmitted. 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 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.

[0115] The settings for the bandwidth portion supported by the above 5G can be used for various purposes.

[0116] According to some embodiments, 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.

[0117] In addition, according to some embodiments, 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 transmission and reception is to be performed at a specific subcarrier spacing, the bandwidth portion set to that subcarrier spacing may be activated.

[0118] In addition, according to some embodiments, 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, performing monitoring of an unnecessary downlink control channel using a large bandwidth of 100 MHz can 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.

[0119] 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.

[0120] Next, downlink control information (DCI) in 5G systems will be explained in detail.

[0121] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) can be transmitted from a base station to a terminal via DCI. The terminal can monitor 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.

[0122] 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 over the PDCCH, the terminal checks the CRC using its assigned RNTI; if the CRC check result is correct, the terminal knows that the message has been transmitted to it.

[0123] 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).

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128]

[0129] 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.

[0130] 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.

[0131]

[0132] 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.

[0133] 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.

[0134] 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 a 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 a PDSCH for receiving system information by monitoring 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 pre-agreed set of CCEs. Scheduling allocation information for a UE-specific PDSCH or PUSCH may be received by a 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.

[0135] 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.

[0136]

[0137]

[0138]

[0139]

[0140] 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.

[0141] 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.

[0142] 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.

[0143] - 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

[0144] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0145] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0146] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0147] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0148] 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.

[0149] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0150] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0151] RNTIs may follow at least one of the following definitions and uses.

[0152] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH or PUSCH scheduling

[0153] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0154] CS-RNTI (Configured Scheduling RNTI): Used for semi-static terminal-specific PDSCH scheduling.

[0155] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase.

[0156] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0157] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0158] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH has been punctured.

[0159] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0160] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0161] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0162] The DCI formats described above may follow the definitions in Table 8 below.

[0163] 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

[0164] In CORESET p and search space set s, the search space of aggregation level L can be expressed as Equation 1 below.

[0165] [Mathematical Formula 1]

[0166]

[0167]

[0168] The value may be 0 for the common search space.

[0169] 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.

[0170] In the following, we will specifically describe the method by which a terminal measures channel conditions in a 5G communication system and reports them to a base station.

[0171] Channel state information (CSI) may include at least one of the following information.

[0172] - 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.

[0173] - Precoding Matrix Indicator (PMI): Precoding matrix indicator information selected by the terminal

[0174] - CRI (CSI-RS resource indicator): CSI-RS information measured by the terminal

[0175] - RI (Rank Indicator): Rank indicator information selected by the terminal

[0176] - LI (Layer indicator): Indicator information for the best layer among the precoding matrices reported by the terminal

[0177] - SSBRI (SS / PBCH block resource indicator): SSB information measured by the terminal

[0178] - L1-RSRP (Reference Signal Received Power): L1 RSRP information measured by the terminal

[0179] The base station can control at least one of the time and frequency resources for the aforementioned CSI measurement and reporting of the terminal.

[0180] 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.

[0181] 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).

[0182] 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.

[0183] 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.

[0184] As mentioned above, the frequency bands utilized by 5G systems range from hundreds of MHz to tens of GHz.

[0185] FIG. 5 shows the interrelationship between frequency band, coverage, and bandwidth according to one embodiment of the present disclosure.

[0186] 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 lower 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.

[0187] Generally, mobile carriers can secure multiple frequency bands to provide mobile communication services to users. For example, a mobile carrier can operate a combined LTE and 5G system by combining existing frequency bands for LTE systems with newly secured frequency bands for 5G systems. As another example, a mobile carrier can secure frequency bands for 5G systems across multiple bands and then combine the frequencies from those bands to provide mobile communication services through 5G CA. Similarly, a 6G mobile communication system can provide mobile communication services through 6G CA by combining 6G frequencies with existing 4G or 5G frequencies, or by combining 6G frequencies with each other.

[0188] 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.

[0189] As mobile communication systems evolve, a variety of mobile communication services are emerging. Consequently, various types of terminals specialized for specific services are being introduced, creating a need for communication systems to handle them effectively. Terminal types can be classified based on several factors, for example, as follows.

[0190] - Classification based on terminal complexity

[0191] ■ High-spec terminal: A terminal capable of processing ultra-high-speed or ultra-low-latency data, capable of handling a relatively wide transmission and reception bandwidth and equipped with many transmitting and receiving antennas. Therefore, the complexity of the terminal may be relatively high.

[0192] ■ Low-spec terminals: These are terminals that do not require ultra-high-speed data processing. They can handle a relatively narrow transmission and reception bandwidth and be equipped with fewer transmitting and receiving antennas. Therefore, the complexity of the terminal may be relatively low.

[0193] - Classification based on terminal mobility

[0194] ■ Mobile terminal: A terminal with no particular restrictions on location, capable of supporting operations such as measurement and handover processing to support terminal mobility.

[0195] ■ Fixed Terminal: A terminal that supports mobile communication services at a fixed location. Since blocks to support terminal mobility are unnecessary compared to mobile terminals, a simplified implementation is possible.

[0196] The operation of the system proposed in this disclosure is explained below through specific embodiments.

[0197] The main gist of the present invention is to construct a mobile communication system that supports various types of terminals and to define a terminal and base station procedure that operates smoothly from the initial connection procedure of the terminal without limitation on the terminal type. The terminal type may include at least one of a wide bandwidth terminal type (terminal type 1) with a relatively wide transmission and reception bandwidth and a narrow bandwidth terminal type (terminal type 2) with a relatively narrow transmission and reception bandwidth.

[0198] The following initial access procedure may be understood to include at least one of the transmission and reception of synchronization signals and system information between the terminal and the base station, and a random access procedure between the terminal and the base station. Subsequently, the terminal may request an attach to the network, and after the attach procedure is completed, may transmit and receive packets (or data) through the network.

[0199] The following is a description of each specific embodiment. The present invention may include a plurality of embodiments, and while each embodiment may be implemented independently, a plurality of embodiments may also be implemented in combination 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 a 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 in various ways depending on technical requirements or specific application cases, and the present invention may encompass various embodiments including such variations and combinations.

[0200] <1st Embodiment>

[0201] The first embodiment describes a channel structure and a transmission / reception method required for the initial connection procedure of a terminal when the terminal type 1 and terminal type 2 are supported as a mobile communication service.

[0202] FIG. 6 is a diagram showing the relationship between PBCH and PDCCH by terminal type according to one embodiment of the present disclosure.

[0203] FIG. 6 is a diagram illustrating the relationship between wireless resources to which a PBCH (physical broadcast channel) for terminal type 1 and a PDCCH that schedules system information (or system information block, SIB) for terminal type 1 can be mapped, according to one embodiment of the present disclosure. In FIG. 6, the horizontal direction represents the time domain, and the vertical direction represents the frequency domain.

[0204] In the case of terminal type 1, a relatively wide bandwidth is supported, but to reduce the complexity of detecting the synchronization signal of the terminal during the initial connection phase, the bandwidth of the PBCH or the synchronization signal with the PBCH can be limited to within a predetermined value. Referring to FIG. 6, the bandwidth of the PBCH (610) is shown to be X1 (601).

[0205] The base station may include a wireless resource (620) to which a PDCCH (which may be referred to as SIB PDCCH for convenience of explanation) scheduling a SIB for the terminal type 1 can be mapped as control information in the PBCH (610) for the terminal type 1. For example, the PBCH (610) may include at least some of the following as PDCCH configuration information.

[0206] -SIB PDCCH bandwidth (X2 (602))

[0207] Frequency domain mapping location of -SIB PDCCH

[0208] -Time domain mapping location of SIB PDCCH (X3 (603))

[0209] - Time domain interval between PBCH and SIB PDCCH (T1 (604))

[0210] Regarding the above control information, the frequency domain unit may be RB, MHz, etc., and the time domain unit may be a symbol, slot, ms, etc.

[0211] The bandwidth (X2) (602) of the above SIB PDCCH may exceed the bandwidth (X1) (610) of the PBCH (X2 > X1). That is, after the synchronization signal detection step, the broadband service supported by terminal type 1 can be applied to the processing of the SIB PDCCH.

[0212] Next, the SIB PDCCH can schedule a PDSCH carrying a SIB for terminal type 1 (hereinafter referred to as SIB PDSCH for convenience of explanation). The terminal can obtain a SIB for terminal type 1 by receiving the SIB PDSCH from the scheduling information of the SIB PDCCH. The bandwidth of the SIB PDSCH for terminal type 1 is provided through the scheduling information of the SIB PDCCH, and, similar to the bandwidth of the SIB PDCCH, the bandwidth of the SIB PDSCH may exceed the bandwidth of the PBCH. The SIB includes cell-common transmission and reception control information for terminal type 1, and may include, for example, at least one of random access control information for terminal type 1, paging control information for terminal type 1, and common control information for various physical channels for terminal type 1.

[0213] FIG. 7 is another diagram showing the relationship between PBCH and PDCCH by terminal type according to one embodiment of the present disclosure.

[0214] FIG. 7 is a diagram illustrating the relationship between wireless resources to which a PBCH for terminal type 2 and a SIB PDCCH for terminal type 2 can be mapped, according to one embodiment of the present disclosure. In FIG. 7, the horizontal direction represents the time domain, and the vertical direction represents the frequency domain.

[0215] The bandwidth Y1 (701) of the above PBCH (710) can be ensured not to exceed the minimum bandwidth that terminal type 2 can support. Therefore, if it is terminal type 2, it is possible to prevent the case where the above PBCH (710) cannot be received due to insufficient bandwidth. And when compared with terminal type 1, a relationship Y1 < X1 can be assumed.

[0216] The base station may include a wireless resource (720) to which the SIB PDCCH for the terminal type 2 can be mapped as control information in the PBCH (710) for the terminal type 2 and notify the terminal. For example, the PBCH (710) may include at least some of the following as PDCCH configuration information.

[0217] -SIB PDCCH bandwidth (Y2 (702))

[0218] Frequency domain mapping location of -SIB PDCCH

[0219] -Time domain mapping location of SIB PDCCH (Y3 (703))

[0220] - Time domain interval between PBCH and SIB PDCCH (T1 (704))

[0221] Regarding the above control information, the frequency domain unit may be RB, MHz, etc., and the time domain unit may be a symbol, slot, ms, etc.

[0222] The bandwidth (Y2) (702) of the above SIB PDCCH is subject to the constraints of the narrow bandwidth terminal type and cannot exceed the bandwidth (Y1) (701) of the PBCH. (Y2 Y1)

[0223] Next, the SIB PDCCH (720) can schedule a SIB PDSCH for terminal type 2. The terminal can obtain a SIB for terminal type 2 by receiving the SIB PDSCH from the scheduling information of the SIB PDCCH (720). The bandwidth of the SIB PDSCH for terminal type 2 is provided through the scheduling information of the SIB PDCCH (720), and, like the bandwidth of the SIB PDCCH, the bandwidth of the SIB PDSCH cannot exceed the bandwidth of the PBCH.

[0224] The above SIB includes cell-common transmission and reception control information for terminal type 2, for example, may include at least one of random access control information for terminal type 2, paging control information for terminal type 2, and common control information for various physical channels for terminal type 2.

[0225] Compared to terminal type 1, terminal type 2 has a relatively narrow bandwidth; therefore, the bandwidth of each channel reflects this, and the bandwidth of the physical channel for terminal type 2 may have a relatively narrower characteristic than the bandwidth of the physical channel for terminal type 1. For example, the bandwidth of the PBCH may follow the relationship Y1 < X1, and the bandwidth of the SIB PDCCH may follow the relationship Y2 < X2. If the bandwidth of the SIB PDCCH for terminal type 2 is insufficient, the time domain size can be increased to compensate for the lack of resources. In this case, the relationship Y3 > X3 may be observed.

[0226] The first embodiment relates to a case where both terminal type 1 and terminal type 2 are to be supported, wherein the base station provides at least one of a PBCH, a SIB PDCCH, and a SIB PDSCH for terminal type 1 and terminal type 2, respectively.

[0227] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names such as PBCH, SIB PDCCH, SIB PDSCH described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0228] FIG. 8 is a diagram showing an example of an initial connection procedure of a terminal according to one embodiment of the present disclosure.

[0229] FIG. 8 shows an example of an initial connection procedure for each terminal type 1 and terminal type 2 in a system that supports terminal type 1 and terminal type 2 as mobile communication services according to a first embodiment.

[0230] In step 801, the terminal can perform downlink time and frequency synchronization from the SSB received from the base station and obtain a cell identifier (cell ID). In one embodiment, the SSB includes at least one of a synchronization signal and a PBCH, and can be distinguished into an SSB for terminal type 1 and an SSB for terminal type 2, respectively. Accordingly, terminal type 1 may receive the SSB for terminal type 1 and not receive the SSB for terminal type 2. Similarly, terminal type 2 may receive the SSB for terminal type 2 and not receive the SSB for terminal type 1. In one embodiment, the PBCH included in each of the SSBs may adopt the structure of the PBCH described in FIGS. 6 and FIGS. 7. The SSB is merely an example, and the SSB may be replaced with a physical signal for downlink time and frequency synchronization transmitted from the base station.

[0231] In step 802, the terminal can obtain PDCCH configuration information. In one embodiment, the terminal can obtain MIB, which is essential system information, in step 802. In one embodiment, the terminal can receive PBCH using the cell ID obtained in step 801 and obtain MIB, which is essential system information, from the PBCH. In one embodiment, MIB may include at least one of CORESET information, which is a time-frequency resource to which the PDCCH is mapped, or PDCCH configuration information. As described above, the base station may set the PDCCH configuration information according to the terminal type and transmit at least one of SIB PDCCH and SIB PDSCH according to the terminal type. Accordingly, in step 802, terminal type 1 can obtain PDCCH configuration information for terminal type 1, and terminal type 2 can obtain PDCCH configuration information for terminal type 2.

[0232] In step 803, each terminal can monitor the SIB PDCCH by referring to the PDCCH configuration information obtained in step 802. In step 804, each terminal can obtain system information (e.g., SIB) by receiving the SIB PDSCH from the scheduling information of the SIB PDCCH. The SIB includes cell-common transmission and reception control information, which may include, for example, random access control information, paging control information, and common control information for various physical channels.

[0233] After step 804, the terminal may proceed with a random access procedure or receive a paging channel as needed.

[0234] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0235] FIG. 9 is a diagram showing an example of a base station procedure for supporting a terminal initial connection procedure according to one embodiment of the present disclosure.

[0236] FIG. 9 shows an example of a base station procedure for supporting an initial connection procedure of a terminal in a system that supports terminal type 1 and terminal type 2 as mobile communication services according to a first embodiment.

[0237] In step 901, the base station may transmit an SSB. In one embodiment, the SSB includes at least one of a synchronization signal and a PBCH, and may be divided into an SSB for terminal type 1 and an SSB for terminal type 2, respectively. In one embodiment, the PBCH included in each of the SSBs may adopt the structure of the PBCH described in FIGS. 6 and FIGS. 7.

[0238] In step 902, the base station can transmit the SIB PDCCH required to transmit system information (SIB) according to each terminal type for each terminal type.

[0239] In step 903, the base station may transmit system information according to each terminal type. In one embodiment, the system information includes cell-common transmission and reception control information, for example, random access control information, paging control information, common control information for various physical channels, etc.

[0240] After step 903, the base station may, as needed, proceed with a random access procedure based on a terminal request or transmit a paging channel.

[0241] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0242] <Second Embodiment>

[0243] The second embodiment describes another example of a channel structure and a transmission / reception method required for the initial connection procedure of a terminal when the terminal type 1 and terminal type 2 are supported as a mobile communication service.

[0244] FIG. 10 is a diagram showing the relationship between a PBCH and a PDCCH by terminal type according to one embodiment of the present disclosure.

[0245] FIG. 10 is a diagram illustrating the relationship between a common PBCH (1010), a wireless resource (1020) to which a SIB PDCCH for terminal type 1 can be mapped, and a wireless resource (1030) to which a SIB PDCCH for terminal type 2 can be mapped, according to one embodiment of the present disclosure. In FIG. 10, the horizontal direction represents the time domain, and the vertical direction represents the frequency domain.

[0246] The bandwidth Z1 (1001) of the above PBCH (1010) can be configured so that it does not exceed both the minimum bandwidth that terminal type 1 can support and the minimum bandwidth that terminal type 2 can support. Therefore, regardless of the terminal type, it is possible to prevent the case where the above PBCH cannot be received due to insufficient bandwidth.

[0247] In one embodiment, the base station may include a wireless resource (1020) to which a SIB PDCCH for terminal type 1 can be mapped and a wireless resource (1030) to which a SIB PDCCH for terminal type 2 can be mapped as control information in the PBCH and notify the terminal. For example, the PBCH may include at least some of the following as PDCCH configuration information for terminal type 1.

[0248] -SIB PDCCH bandwidth (Z2 (1002))

[0249] Frequency domain mapping location of -SIB PDCCH

[0250] -Time domain mapping location of SIB PDCCH (Z3 (1003))

[0251] - Time domain interval between PBCH and SIB PDCCH (T1 (1006))

[0252] Additionally, the PBCH may include at least some of the following as PDCCH configuration information for terminal type 2.

[0253] -SIB PDCCH bandwidth (Z4 (1004))

[0254] Frequency domain mapping location of -SIB PDCCH

[0255] -Time domain mapping location of SIB PDCCH (Z5 (1005))

[0256] - Time domain interval between PBCH and SIB PDCCH (T2 (1007))

[0257] In one embodiment, for the control information, the frequency domain unit may be RB, MHz, etc., and the time domain unit may be a symbol, slot, ms, etc.

[0258] In one embodiment, the bandwidth (Z2) (1002) of the SIB PDCCH for terminal type 1 may exceed the bandwidth (Z1) (1010) of the PBCH (Z2 > Z1). That is, after the synchronization signal detection step, the broadband service supported by terminal type 1 can be applied to the processing of the SIB PDCCH. However, the bandwidth (Z4) (1004) of the SIB PDCCH for terminal type 2 cannot exceed the bandwidth (Z1) (1010) of the PBCH, subject to the constraints of the narrowband terminal type. (Z4 Z1)

[0259] Next, the SIB PDCCH (1020) for terminal type 1 can schedule the SIB PDSCH for terminal type 1, and the SIB PDCCH (1030) for terminal type 2 can schedule the SIB PDSCH for terminal type 2. Terminal type 1 can receive the SIB PDSCH for terminal type 1 to obtain the SIB for terminal type 1, and terminal type 2 can receive the SIB PDSCH for terminal type 2 to obtain the SIB for terminal type 2. The SIB includes cell-common transmission and reception related control information for each terminal type, for example, may include at least one of random access related control information, paging related control information, and common control information for various physical channels.

[0260] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names such as PBCH, SIB PDCCH, SIB PDSCH described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0261] Next, we will explain how the base station provides PDCCH configuration information for terminal type 1 and PDCCH configuration information for terminal type 2 through the PBCH.

[0262] Method 1: Method for providing individual PDCCH configuration information by terminal type

[0263] Method 1 is a method of individually providing PDCCH configuration information for terminal type 1, consisting of N1 bits, and PDCCH configuration information for terminal type 2, consisting of N2 bits, as PBCH control information. In one embodiment, the PDCCH configuration information may include at least some control information such as the bandwidth of the SIB PDCCH, the frequency domain mapping location of the SIB PDCCH, the time domain mapping location of the SIB PDCCH, and the time domain interval between the PBCH and the SIB PDCCH. In one embodiment, the PDCCH configuration information may implicitly indicate which terminal type corresponds to according to the mapping order within the PBCH. For example, the PBCH may configure the PDCCH configuration information as control information of the PBCH in the format {PDCCH configuration information, PDCCH configuration information}, wherein the first PDCCH configuration information corresponds to terminal type 1 and the second PDCCH configuration information corresponds to terminal type 2. Alternatively, the terminal type indicator, which explicitly indicates which terminal type the PDCCH configuration information corresponds to, and the PDCCH configuration information can be configured as a bundle. For example, the PDCCH configuration information can be configured in the format {(terminal type indicator, PDCCH configuration information), (terminal type indicator, PDCCH configuration information)}.

[0264] Method 2: Method for Providing Common PDCCH Configuration Information

[0265] Method 2 is a method of providing PDCCH configuration information consisting of N3 bits that are commonly applied to terminal type 1 and terminal type 2, by including this information in the PBCH control information in order to reduce the size of the control information included in the PBCH. In addition, to adjust the settings for each terminal type, terminal type 1 and terminal type 2 may independently define a method for interpreting the PDCCH configuration information by reflecting the characteristics of each terminal type. For example, terminal type 1 may interpret the PDCCH configuration information by referring to a lookup table for terminal type 1, and terminal type 2 may interpret the PDCCH configuration information by referring to a lookup table for terminal type 2.

[0266] In one embodiment, the PBCH may include a cell barring indicator as control information regarding whether a terminal type can connect to a corresponding cell. For example, if the cell barring indicator = 'barred', the terminal cannot connect to the corresponding cell, and if the cell barring indicator = 'not barred', the terminal can connect to the corresponding cell. In one embodiment, the base station may control whether a terminal can connect to a cell by terminal type according to the system operation status. For example, the base station may allow connection for terminal type 1 but not allow connection for terminal type 2, and so on. To this end, the terminal type indicator and the cell barring indicator may be configured as a bundle to explicitly indicate which terminal type the cell barring indicator corresponds to. For example, they may be included in the PBCH control information in the format {(terminal type indicator, cell barring indicator), (terminal type indicator, cell barring indicator)}. As a modified example, when combined with the explicit method of Method 1 above, it can be included in the PBCH control information in the format {(terminal type indicator, cell barring indicator, PDCCH setting information), (terminal type indicator, cell barring indicator, PDCCH setting information)}.

[0267] In the case of the second embodiment, when terminal type 1 or terminal type 2 completes the initial connection procedure and enters the connected state, the operation for downlink channel mapping can be further defined by referring to the SIB PDCCH settings of the other terminal type obtained through the PBCH. Referring to FIG. 10, the explanation is as follows. For example, when terminal type 1 in the connected state receives a PDSCH schedule from the base station, it can identify whether the resource allocation of the corresponding channel includes some or all of the radio resources (1030) of the SIB PDCCH of terminal type 2 obtained through the PBCH. If the resource allocation of the above PDSCH overlaps with the wireless resources of the SIB PDCCH of the terminal type 2, the terminal may determine that the above PDSCH is not mapped to the wireless resources (1030) of the SIB PDCCH of the terminal type 2, but is mapped to the remaining resources among the allocated wireless resources of the PDSCH that do not overlap with the wireless resources of the SIB PDCCH, and attempt PDSCH decoding. As another example, when a terminal type 1 in a connected state monitors the PDCCH from the base station, the wireless resource (1030) area of ​​the SIB PDCCH of the terminal type 2 is excluded, thereby preventing interference in PDCCH mapping between terminal type 1 and terminal type 2.

[0268] In the same way, when a connected terminal type 2 receives a PDSCH from a base station, it can determine whether the resource allocation of the channel includes some or all of the wireless resources (1020) of the SIB PDCCH of terminal type 1 obtained through the PDSCH. If the resource allocation of the PDSCH overlaps with the wireless resources of the SIB PDCCH of terminal type 1, the terminal can determine that the PDSCH is not mapped to the wireless resources (1020) of the SIB PDCCH of terminal type 1, but is mapped to the remaining resources among the allocated PDSCH wireless resources that do not overlap with the wireless resources of the SIB PDCCH, and attempt PDSCH decoding. As another example, when terminal type 2 in a connected state monitors the PDCCH from the base station, the wireless resource (1020) area of ​​the SIB PDCCH of terminal type 1 is excluded so that there is no interference in the PDCCH mapping between terminal type 1 and terminal type 2.

[0269] FIG. 11 is a diagram showing another example of an initial connection procedure of a terminal according to one embodiment of the present disclosure.

[0270] FIG. 11 shows an example of an initial connection procedure for each terminal type 1 and terminal type 2 in a system that supports terminal type 1 and terminal type 2 as mobile communication services according to a second embodiment.

[0271] In step 1100, the terminal can perform downlink time and frequency synchronization from the SSB received from the base station and obtain a cell identifier (cell ID). In one embodiment, the SSB includes at least one of a synchronization signal and a PBCH, and can maintain a single configuration regardless of terminal type 1 and terminal type 2. In one embodiment, the PBCH included in the SSB may adopt the structure of the PBCH described in FIG. 10. The SSB is merely an example, and the SSB can be replaced with a physical signal for matching downlink time and frequency synchronization transmitted from the base station.

[0272] In step 1101, the terminal may proceed to step 1102 if it is terminal type 1, and to step 1105 if it is terminal type 2, depending on its terminal type.

[0273] In the case of terminal type 1, the terminal can obtain PBCH control information according to terminal type 1 in step 1102. In one embodiment, the terminal can obtain MIB, which is essential system information, in step 1102. In one embodiment, the terminal can receive PBCH using the cell ID obtained in step 1100 and obtain MIB, which is essential system information, from the PBCH. In one embodiment, MIB may include at least one of CORESET information or PDCCH configuration information, which are time-frequency resources to which the PDCCH is mapped. As described above, the base station may configure the PDCCH configuration information according to each terminal type or configure common PDCCH configuration information. If the cell barring indicator = 'barred' for terminal type 1, the terminal may stop connecting to the corresponding cell and attempt to connect to another cell. If the cell barring indicator = 'not barred' for terminal type 1, the terminal can proceed to the next step 1103.

[0274] In step 1103, the terminal can monitor the SIB PDCCH by referring to the PDCCH configuration information obtained in step 1102. In step 1104, the terminal can obtain the SIB by receiving the SIB PDCCH from the scheduling information of the SIB PDCCH. In one embodiment, the SIB may include cell-common transmission and reception related control information, and may include, for example, random access related control information, paging related control information, common control information for various physical channels, etc.

[0275] In the case of terminal type 2, the terminal can obtain PBCH control information in step 1105. In one embodiment, in step 1105, the terminal can obtain MIB, which is essential system information. In one embodiment, the terminal can receive the PBCH using the cell ID obtained in step 1100 and obtain MIB, which is essential system information, from the PBCH. In one embodiment, the MIB may include CORESET information or PDCCH configuration information, which are time-frequency resources to which the PDCCH is mapped. As described above, the base station may configure the PDCCH configuration information according to each terminal type or configure common PDCCH configuration information. If the cell barring indicator = 'barred' for terminal type 2, the terminal may stop connecting to the corresponding cell and attempt to connect to another cell. If the cell barring indicator = 'not barred' for terminal type 2, the terminal may proceed to the next step 1106.

[0276] In step 1106, the terminal can monitor the SIB PDCCH by referring to the PDCCH configuration information obtained in step 1105. In step 1107, the terminal can obtain the SIB by receiving the SIB PDSCH from the scheduling information of the SIB PDCCH. The SIB includes cell-common transmission and reception control information, and may include, for example, at least one of random access-common control information, paging-common control information, and common control information for various physical channels.

[0277] Afterward, the terminal may proceed with a random access procedure or receive a paging channel as needed.

[0278] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0279] In one embodiment, with reference to FIG. 9 below, an example of a base station procedure for supporting an initial connection procedure of a terminal can be described in a system that supports terminal type 1 and terminal type 2 as mobile communication services according to a second embodiment.

[0280] In step 901, the base station may transmit an SSB. The SSB includes at least one of a synchronization signal and a PBCH, and may maintain a single configuration regardless of terminal type 1 and terminal type 2. The PBCH included in the SSB may adopt the structure of the PBCH described in FIG. 10. The base station may configure the PDCCH configuration information according to each terminal type, or configure the PBCH control information using common PDCCH configuration information.

[0281] In step 902, the base station can transmit the SIB PDCCH required to transmit system information (SIB) according to each terminal type for each terminal type.

[0282] In step 903, the base station may transmit system information according to each terminal type. The system information includes cell-common transmission and reception control information, and may include, for example, at least one of random access control information, paging control information, and common control information for various physical channels.

[0283] After step 903, the base station may, as needed, proceed with a random access procedure based on a terminal request or transmit a paging channel.

[0284] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0285] <Third Embodiment>

[0286] The third embodiment describes another example of a channel structure and a transmission / reception method required for the initial connection procedure of a terminal when the terminal type 1 and terminal type 2 are supported as a mobile communication service.

[0287] With reference to FIGS. 12a, 12b, 12c, 12d, 12e, and 12f, various methods for supporting terminal type 1 and terminal type 2 will be described below.

[0288] FIGS. 12a, FIGS. 12b, FIGS. 12c, FIGS. 12d, FIGS. 12e and FIGS. 12f are drawings illustrating an initial connection method between a terminal and a base station according to one embodiment of the present disclosure.

[0289] FIGS. 12a, 12b, 12c, 12d, 12e, and 12f illustrate an example of a method for configuring at least one of the synchronization signal (SS), PBCH, SIB PDCCH, or SIB PDSCH of a terminal into a signal (or channel) for terminal type 1 and a signal (or channel) for terminal type 2.

[0290] FIG. 12a (Method 1) illustrates an example of a method for configuring terminal types by distinguishing them starting from the synchronization signal (SS) that the terminal receives first during the initial connection phase. That is, the synchronization signal for terminal type 1 and the synchronization signal for terminal type 2 can be distinguished as separate signals. Subsequently, the PBCH, SIB PDCCH, and SIB PDSCH required for the terminal's initial connection can also be distinguished as signals (or channels) for terminal type 1 and signals (or channels) for terminal type 2. The first embodiment described above may correspond to Method 1. In one embodiment, the random access procedure performed by the terminal after acquiring the SIB through the reception of the SIB PDSCH can be distinguished by terminal type.

[0291] FIG. 12b (Method 2) illustrates an example of a method in which the synchronization signal is composed of a common signal without distinction of terminal type, and the terminal type is distinguished and configured starting from the PBCH. That is, the PBCH, SIB PDCCH, and SIB PDSCH can be distinguished into a signal (or channel) for terminal type 1 and a signal (or channel) for terminal type 2. In one embodiment, the random access procedure performed by the terminal after acquiring the SIB through the reception of the SIB PDSCH can be distinguished by terminal type.

[0292] FIG. 12c (Method 3) illustrates an example of a method in which the synchronization signal and the PBCH are configured as a common signal without distinguishing terminal types, and the SIB PDCCH is configured by distinguishing terminal types. That is, the SIB PDCCH and SIB PDSCH can be distinguished into a signal (or channel) for terminal type 1 and a signal (or channel) for terminal type 2. The second embodiment described above may correspond to Method 3. In one embodiment, the control information of the PBCH may include configuration information for each terminal type. The random access procedure performed by the terminal after acquiring the SIB through the reception of the SIB PDSCH can be distinguished by terminal type.

[0293] FIG. 12d (Method 4) illustrates an example of a method in which the synchronization signal, PBCH, and SIB PDCCH are configured as common signals without distinction of terminal type, and the terminal type is distinguished and configured starting from the SIB PDSCH. That is, the SIB PDSCH can be distinguished into a signal (or channel) for terminal type 1 and a signal (or channel) for terminal type 2. In one embodiment, the control information of the SIB PDCCH may include scheduling by terminal type. In one embodiment, the random access procedure performed by the terminal after acquiring the SIB through the reception of the SIB PDSCH can be distinguished by terminal type.

[0294] FIG. 12e (Method 5) illustrates an example of a method in which the synchronization signal, PBCH, SIB PDCCH, and SIB PDSCH are configured as a common signal without distinction of terminal type. In one embodiment, the base station can distinguish and instruct random access settings by terminal type through the SIB included in the SIB PDSCH. Accordingly, the random access procedure performed by the terminal after acquiring the SIB can be distinguished by terminal type.

[0295] FIG. 12f (Method 6) illustrates an example of a method configured with a common signal without distinction of terminal type during the initial connection phase. Accordingly, a common procedure can also be applied to the random access procedure without distinction of terminal type. In one embodiment, when the terminal transitions to a connection state after the completion of random access, the base station may refer to the terminal's UE capability information to configure the terminal to perform transmission and reception processing separately for each terminal type. Then, the terminal may proceed with transmission and reception processing for each terminal type according to the base station configuration.

[0296] FIG. 13 is a drawing showing 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.

[0297] Referring to FIG. 13, the terminal may be configured to include at least one of a transmitter (1304) composed of an uplink transmission processing block (1301), a multiplexer (1302), and a transmission RF block (1303), a receiver (1308) composed of a downlink reception processing block (1305), a demultiplexer (1306), and a reception RF block (1307), and a control unit (1309). The control unit (1309) can control each of the configuration blocks of the receiver (1308) for receiving a data channel or control channel transmitted by the base station as described above, and each of the configuration blocks of the transmitter (1304) for transmitting an uplink signal.

[0298] In the transmission unit (1304) of the terminal, the uplink transmission processing block (1301) 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 (1301) can be multiplexed with other uplink signals by a multiplexer (1302), then processed by a transmission RF block (1303), and then transmitted to a base station.

[0299] The receiving unit (1308) 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 (1305) 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 (1308) of the terminal can apply the output result of the downlink receiving processing block to the control unit (1309) to support the operation of the control unit (1309).

[0300] FIG. 14 is a block diagram showing an example of the configuration of a terminal according to one embodiment of the present disclosure.

[0301] As illustrated in FIG. 14, the terminal of the present disclosure may include at least one of a processor (1430), a transceiver (1410), or a memory (1420). 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 (1430), the transceiver (1410), and the memory (1420) may be implemented in the form of a single chip. According to one embodiment, the transceiver (1410) of FIG. 14 may include the transceiver (1304) and the receiver (1308) of FIG. 13. Additionally, the processor (1430) of FIG. 14 may include the control unit (1309) of FIG. 13.

[0302] According to one embodiment, the processor (1430) can control a series of processes that enable 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 terminal type. The processor (1430) may include at least one processor, and the processor (1430) can perform a transmission and reception operation of the terminal in a wireless communication system applying the operation of the present disclosure described above by executing a program stored in memory (1420).

[0303] The transceiver (1410) can transmit and receive signals with a base station. The signals transmitted and received with the base station may include control information and data. The transceiver (1410) 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 an example of the transceiver (1410), and the components of the transceiver (1410) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (1410) can receive a signal through a wireless channel and output it to a processor (1430), and transmit the signal output from the processor (1430) through a wireless channel.

[0304] According to one embodiment, the memory (1420) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1420) may store control information or data included in signals transmitted and received by the terminal. The memory (1420) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1420) may be a plurality of. According to one embodiment, the memory (1420) may store a program for performing the operation of the terminal according to the terminal type, which is one of the embodiments of the present disclosure described above.

[0305] FIG. 15 is a block diagram showing an example of the configuration of a base station according to one embodiment of the present disclosure.

[0306] As illustrated in FIG. 15, the base station of the present disclosure may include at least one of a processor (1530), a transceiver (1510), or a memory (1520). 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 (1530), the transceiver (1510), and the memory (1520) may be implemented in the form of a single chip.

[0307] The processor (1530) 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, the components of the base station can be controlled to perform a method of scheduling terminals according to terminal type according to the embodiments of the present disclosure. The processor (1530) may include at least one processor, and the processor (1530) can perform a method of scheduling terminals by frequency instruction of the base station of the present disclosure described above by executing a program stored in memory (1520).

[0308] The transceiver (1510) can transmit and receive signals with a terminal. The signals transmitted and received with the terminal may include control information and data. The transceiver (1510) 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 an example of the transceiver (1510), and the components of the transceiver (1510) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (1510) can receive a signal through a wireless channel and output it to a processor (1530), and transmit the signal output from the processor (1530) through a wireless channel.

[0309] According to one embodiment, the memory (1520) may store programs and data necessary for the operation of the base station. Additionally, the memory (1520) may store control information or data included in signals transmitted and received by the base station. The memory (1520) 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 (1520). According to one embodiment, the memory (1520) may store a program for performing a method of scheduling a terminal according to the terminal type, which are embodiments of the present disclosure described above.

[0310] 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 form, 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.

[0311] 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 are possible. Furthermore, each of the above embodiments may be combined and operated 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.

[0312] 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 UE (user, equipment) in a wireless communication system, A step of receiving a PBCH (physical broadcast channel) from a base station—the PBCH includes PDCCH (physical downlink control channel) configuration information—; A step of obtaining the PDCCH setting information based on the terminal type of the above UE; and Based on the above-mentioned acquired PDCCH setting information, the method includes the step of receiving a PDCCH related to the terminal type from the base station; A method characterized in that the above terminal type represents one of a plurality of terminal types with different transmission and reception bandwidths.

2. In Paragraph 1, The above PDCCH configuration information includes common PDCCH configuration information related to the plurality of terminal types, or A method characterized in that the above PDCCH setting information includes PDCCH setting information related to a first terminal type and PDCCH setting information related to a second terminal type.

3. In paragraph 1, the above PDCCH setting information is, PDCCH bandwidth information, Frequency domain mapping location information of PDCCH, PDCCH time domain mapping location information, and A method characterized by including at least one of the information regarding the time domain interval between the above PBCH and PDCCH.

4. A method according to claim 1, wherein the PBCH includes an indicator indicating whether it is possible to connect to the corresponding cell for each terminal type.

5. In paragraph 1, the bandwidth of the PBCH is, A method characterized by being configured so as not to exceed the minimum bandwidths that the above plurality of terminal types can support.

6. In a method performed by a base station in a wireless communication system, A step of transmitting a PBCH (physical broadcast channel)—the PBCH includes PDCCH (physical downlink control channel) configuration information—; and A method characterized by including the step of transmitting a plurality of PDCCHs related to a plurality of terminal types with different transmission and reception bandwidths based on the above PDCCH setting information.

7. In Paragraph 6, The above PDCCH configuration information includes common PDCCH configuration information related to the plurality of terminal types, or A method characterized in that the above PDCCH setting information includes PDCCH setting information related to a first terminal type and PDCCH setting information related to a second terminal type.

8. In paragraph 6, the above PDCCH setting information is, PDCCH bandwidth information, Frequency domain mapping location information of PDCCH, PDCCH time domain mapping location information, and A method characterized by including at least one of the information regarding the time domain interval between the above PBCH and PDCCH.

9. A method according to claim 6, characterized in that the PBCH includes an indicator of whether it is possible to connect to the cell according to the terminal type.

10. In paragraph 6, the bandwidth of the above PBCH is, A method characterized by being configured so as not to exceed the minimum bandwidths that the above plurality of terminal types can support.

11. In a wireless communication system, regarding the UE (user equipment), At least one transceiver; One or more processors; and It includes memory for storing instructions, and when said instructions are executed individually or collectively by said one or more processors, said UE: Receive a PBCH (physical broadcast channel) from a base station—the said PBCH includes PDCCH (physical downlink control channel) configuration information—; Based on the terminal type of the above UE, the above PDCCH setting information is obtained, and Based on the above-mentioned acquired PDCCH configuration information, cause to receive a PDCCH related to the terminal type from the base station, and A UE characterized in that the above terminal type represents one of a plurality of terminal types with different transmission and reception bandwidths.

12. In Paragraph 11, The above PDCCH configuration information includes common PDCCH configuration information related to the plurality of terminal types, or A UE characterized in that the above PDCCH setting information includes PDCCH setting information related to a first terminal type and PDCCH setting information related to a second terminal type.

13. In Clause 11, the above PDCCH setting information is, PDCCH bandwidth information, Frequency domain mapping location information of PDCCH, PDCCH time domain mapping location information, and A UE characterized by including at least one of the information regarding the time domain interval between the above PBCH and PDCCH.

14. In a base station of a wireless communication system, At least one transceiver; One or more processors; and It includes a memory for storing instructions, and when the instructions are executed individually or collectively by one or more processors, the base station: Transmitting a PBCH (physical broadcast channel)—the PBCH includes PDCCH (physical downlink control channel) configuration information—; and A base station characterized by causing multiple PDCCHs related to multiple terminal types with different transmission and reception bandwidths based on the above PDCCH setting information.

15. In Paragraph 14, The above PDCCH configuration information includes common PDCCH configuration information related to the plurality of terminal types, or A base station characterized by the above PDCCH setting information including PDCCH setting information related to a first terminal type and PDCCH setting information related to a second terminal type.

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