Method and apparatus for transmitting and receiving non-contiguous carriers in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system capable of maximizing a higher data transmission rate and frequency efficiency. More specifically, the present disclosure provides a method performed by a terminal in a wireless communication system. The method comprises the steps of: transmitting, to a base station, information on a band capable of receiving a non-contiguous carrier aggregation, wherein an integrated bandwidth between a lowest frequency and a highest frequency of the non-contiguous carrier aggregation is smaller than the bandwidth of the band; receiving, from the base station, configuration information instructing to receive the non-contiguous carrier aggregation in the band; and receiving, from the base station, the non-contiguous carrier aggregation in the band through one Rx chain capable of processing the integrated bandwidth.

Description

Method and device for transmitting and receiving non-continuous carrier waves in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system (or, mobile communication system). Specifically, the present disclosure relates to a method for setting terminal capabilities in a wireless communication system so that a terminal can process non-contiguous carrier aggregation as a single receiver, as well as a method for a base station, having received the terminal capabilities, to set multiple carriers as a single integrated carrier in a single cell and transmit them, as well as a method for setting and operating a terminal and a base station to support this, and a device capable of performing this.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz band ('Sub 6GHz'), such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band ('Above 6GHz'), also known as millimeter wave (mmWave), such as 28GHz and 39GHz. Furthermore, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), it is expected that it will be very important to secure new frequency resources, such as the sub-6GHz band, ultra-high frequency bands, and the upper mid band (7-24GHz), to handle the rapidly increasing data traffic due to the spread of artificial intelligence (AI) technology and the increase in streaming services and to improve user experience. It is expected that it will become very important to secure new frequency resources, such as the mid-frequency band (7-24GHz), also called the upper mid band, and to utilize all available frequency resources efficiently as needed. To this end, reallocating, reusing, or sharing existing frequency bands from 2G to 5G for 6G may be considered. Separately, since the introduction of 5G, the communications market has seen a growing focus on system operational efficiency, sustainability, and improved user experience. Consequently, in addition to improving traditional communication performance, such as data transmission speed and latency, the adoption of new innovative technologies like AI, operational cost reduction, energy efficiency improvements, expanded service coverage, and the introduction of new services are becoming increasingly important.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase radio transmission distances, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (band-width part), new channel coding methods such as LDPC (low density parity check) codes for large-capacity data transmission and polar codes for reliable transmission of control information, L2 pre-processing, and networks that provide dedicated networks specialized for specific services. Standardization of slicing (network slicing) etc. has been progressing.

[0004] Since the early days of 5G mobile communication technology, discussions have been held on improving and enhancing the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, including V2X (vehicle-to-everything) to help autonomous vehicles make driving decisions based on their own location and status information transmitted by the vehicle and to increase user convenience, NR-U (new radio unlicensed) for the purpose of system operation that meets various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE power saving), non-terrestrial network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, positioning, NR support up to 71 GHz, support of reduced capability NR devices for lower cost and complexity compared to general terminals, UE power saving enhancement for improved power management in preparation for the use of various terminal types, and sidelink. Evolution of duplexing technology (duplex enhancements) that researches a new type of duplexing called subband non-overlapping full duplex (SBFD), sidelink enhancement, network energy saving that secures the idle period in which the base station operates in maximum power saving mode and reduces power consumption.Physical layer standardization has been carried out for technologies such as network controlled repeaters, which have improved performance compared to existing repeaters by having the ability to receive and process side control information from the network.

[0005] In addition, it supports new services through linkage and convergence with other industries, including the Industrial Internet of Things (IIoT), an intelligent factory, IAB (Integrated Access and Backhaul) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, 2-step RACH for NR that simplifies random access procedures, multicast and broadcast, standardization of support for multi USIM devices that provide services to users using information from two or more subscriber identity modules (SIMs), sidelink relay that provides relay-related functions to support connections between terminals in long distances and between terminals and networks, small data transmission (SDT) that transmits small data or signaling in an inactive state without transitioning to a connected state, and lower layer triggered mobility (L1 / L2 triggered mobility, LTM) / continuous Standardization of the radio interface architecture / protocol layer for technologies such as mobility enhancements including subsequent conditional PScell ​​addition / change (SCPAC) / conditional handover with candidate SCGs, and extended reality support (XR enhancement) to support XR services in NR systems has also been progressing.5G baseline architecture for integrating network functions virtualization (NFV) and software-defined networking (SDN) technologies (e.g., service-based architecture, service-based interface), mobile edge computing (MEC) that provides services based on the location of the terminal, non-public networks (NPN) that can be used only by some permitted terminals for non-public purposes, disaster roaming that supports the use of communication services through other carrier networks in the event of a communication disaster, proximity-based service via 5G system, support of UAS to support remote identification, tracking, and authorization of uncrewed aerial vehicles (UAVs), structural enhancements to support XR and interactive media services, 5GS to support AI / ML (artificial intelligence / machine learning) services, and advanced mobile edge computing that provides edge computing services in a roaming network. Standardization of system architecture / service fields for the back has also been carried out.

[0006] Currently, at the physical layer, standardization is in progress for technologies such as beam prediction using AI / ML technology, CSI (channel state information) prediction to improve positioning accuracy, ultra-low power terminal technology using low-power wake-up receivers, technology for transmitting LTE (long term evolution) broadcasts to 5G networks, MIMO transmission technology using multiple base stations, and ultra-low power terminals (ambient IoT) that transmit data by obtaining power from an external source without a battery. At the radio interface architecture / protocol layer, standardization is in progress for technologies such as support for LTM scenarios and conditional LTM between Central Units (CUs), support for the same XR service simultaneously between multiple devices, NTN coverage enhancement and evolution, AI / ML-based mobility support, and terminal-to-terminal connection relay across multiple hops between terminals and the network. Furthermore, standardization is underway for satellite communication optimization, energy management and efficiency improvement of 5G systems, SBI-based user plane evolution, Ambient IoT technology, data service provision methods over the IP multimedia subsystem (IMS), and system architecture / service standardization for avatar communication services. Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices.To this end, additional new research will be conducted on eXtended Reality (XR), AI / ML-based 5G performance improvement and complexity reduction, AI service support, metaverse service support, drone communications, etc. to efficiently support augmented reality (AR), virtual reality (VR), and mixed reality (MR).

[0007] Furthermore, the advancement of 5G mobile communication systems is expected to enhance 5G performance and ultimately serve as the foundation for its evolution to 6G. In the 6G era, the three major 5G services mentioned above—eMBB, URLLC, and mMTC—are expected to evolve and expand into immersive communication (IC), hyper-reliable and low-latency communication (HRLLC), and massive communication (MC) services, respectively. In addition, new services such as artificial intelligence (AI) and communication, integrated sensing and communication, and ubiquitous connectivity will be additionally supported. To meet these diverse 6G services, improved performance requirements compared to 5G are essential, and standardization to define these requirements is currently underway.

[0008] In this way, to meet the expanded services and enhanced performance requirements of 6G, it is expected that not only will it be essential to improve existing communication performance, but also to optimize and streamline system operation through the introduction of AI technology, improved energy efficiency, expanded coverage, and application of next-generation security technologies, as well as the development of sustainable communication technologies.

[0009] To this end, the latest AI technology is applied to all areas from the communication system design stage to development, management, and operation to improve communication performance and realize network automation and efficiency; AI-embedded technology that improves user-perceived performance and network operation efficiency by improving power consumption of networks and terminals; technology that reduces power consumption in core base station components such as RF (radio frequency) and modems and in the process of channel coding and signal modulation and demodulation transmission and reception; multi-antenna transmission technology (eXtreme MIMO, X-MIMO) that utilizes large-scale antennas to overcome propagation path loss due to high frequency compared to the 3.5 GHz band of 5G communication and provide equivalent coverage; multiple base station-based transmission and reception technology (distributed MIMO, D-MIMO) to improve quality in cell edge areas; full-duplex communication (sub-band non-overlapping full duplex, SBFD) technology to improve frequency efficiency and system network; next-generation encryption technology (post quantum cryptography, PQC) and zero trust architecture (ZTA) technology to strengthen 6G communication security; initial access delay and mobility Research will be focused on technologies to minimize delay, designing a hardware-friendly protocol structure for ultra-high-speed data processing, and expanding the application of integrity protection technologies.

[0010] In addition, research will be conducted on the structure of mobile communication systems (preventing redundant functions, simplifying functions, etc.), introducing new planes for providing service providers, protecting user privacy, realistic services, enhancing network resiliency, network sharing technologies, improved security technologies (false base stations, lower layer protection, etc.), and intent-based network operation and management.

[0011] Meanwhile, with the development of communication systems and the evolution of terminal receivers, research is being conducted on a process of receiving and processing multiple carriers transmitted by setting up non-contiguous carrier combinations within a band with a single terminal receiver, and on a method of setting band parameters and frequency combination parameters of the terminal to support this.

[0012] Various embodiments of the present disclosure aim to provide devices and methods capable of effectively providing services in a mobile communication system. In a wireless communication system, when a terminal receives a combination of non-contiguous carriers within a band set by a base station, although it is possible to process it independently with a single receiver (or Rx chain) depending on the aggregated channel bandwidth of the combined frequency band, the operation performed by the base station or terminal in the past was defined assuming processing by multiple receivers, and therefore, although reception of more non-contiguous carriers is actually possible, the combination of such non-contiguous carriers has been limited. One purpose of the present disclosure is to provide a method for setting terminal capabilities so that a terminal processes a combination of non-contiguous carriers with a single receiver when receiving the combination, and a specific method for a base station that has received the terminal capabilities to set multiple carriers as a single aggregated carrier in a single cell and transmit them.

[0013] The technical problems to be achieved in various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from various embodiments of the present disclosure described below.

[0014] According to one embodiment of the present disclosure to solve the above problems, a method performed by a terminal in a wireless communication system is provided. The method comprises the steps of: transmitting, to a base station, information about a band capable of receiving a non-contiguous carrier combination, wherein an integrated bandwidth between a lowest frequency and a highest frequency of the non-contiguous carrier combination is smaller than a bandwidth of the band; receiving, from the base station, configuration information instructing to receive the non-contiguous carrier combination in the band; and receiving, from the base station, the non-contiguous carrier combination in the band through one Rx chain capable of processing the integrated bandwidth.

[0015] Also, according to one embodiment of the present disclosure, a method performed by a base station in a wireless communication system is provided. The method comprises the steps of: receiving, from a terminal, information about a band capable of receiving a non-contiguous carrier combination, wherein an integrated bandwidth between a lowest frequency and a highest frequency of the non-contiguous carrier combination is smaller than a bandwidth of the band; transmitting, to the terminal, configuration information instructing the terminal to receive the non-contiguous carrier combination in the band; and transmitting, to the terminal, the non-contiguous carrier combination in the band; wherein the non-contiguous carrier combination is received through one Rx chain capable of processing the integrated bandwidth of the terminal.

[0016] According to one embodiment of the present disclosure, a terminal is provided in a wireless communication system. The terminal includes: a transceiver; a processor communicatively connected to the transceiver; and a memory communicatively connected to the processor and executable by the processor, the memory storing instructions that cause the terminal to transmit, to a base station, information about a band in which a non-contiguous carrier combination can be received, wherein an integrated bandwidth from a lowest frequency to a highest frequency of the non-contiguous carrier combination is smaller than a bandwidth of the band; receive, from the base station, configuration information instructing the terminal to receive the non-contiguous carrier combination in the band; and cause the terminal to receive, from the base station, the non-contiguous carrier combination in the band through a single Rx chain capable of processing the integrated bandwidth.

[0017] According to one embodiment of the present disclosure, a base station is provided in a wireless communication system. The base station includes: a transceiver; a processor communicatively connected to the transceiver; and a memory communicatively connected to the processor and executable by the processor, the memory storing instructions that cause the base station to receive, from a terminal, information about a band in which a non-contiguous carrier combination can be received, wherein an integrated bandwidth from a lowest frequency to a highest frequency of the non-contiguous carrier combination is smaller than a bandwidth of the band, transmit configuration information instructing the terminal to receive the non-contiguous carrier combination in the band, and transmit the non-contiguous carrier combination in the band to the terminal, wherein the non-contiguous carrier combination is received through a single Rx chain capable of processing the integrated bandwidth of the terminal.

[0018] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0019] According to various embodiments of the present disclosure, a device and method for effectively providing a service in a mobile communication system can be provided.

[0020] According to various embodiments of the present disclosure, a method and a device for performing the same can be provided, in which a base station and a terminal maximize (or optimize) throughput by utilizing minimal resources when performing intra-band non-contiguous carrier combining in a wireless communication system.

[0021] The effects that can be obtained from various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0022] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.

[0023] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to an embodiment of the present disclosure.

[0024] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to an embodiment of the present disclosure.

[0025] FIG. 4 is a diagram illustrating an example of base station beam allocation according to a transmission configuration indicator (TCI) state setting in a wireless communication system according to an embodiment of the present disclosure.

[0026] FIG. 5 is a diagram illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation (CA), and dual connectivity situation in a wireless communication system according to an embodiment of the present disclosure.

[0027] Figure 6 is a diagram illustrating an example of inter-band contiguous CA.

[0028] Figure 7 is a diagram illustrating an example of intra-band non-contiguous carrier combining (CA).

[0029] Figure 8 is a diagram illustrating an example of inter-band carrier aggregation (inter-band CA).

[0030] FIG. 9 is a diagram illustrating an example of in-band downlink non-contiguous carrier aggregation that requires multiple receivers at a terminal.

[0031] FIG. 10 is a diagram illustrating an example of receiving non-contiguous carrier aggregation with a single receiver according to a terminal capability report of a terminal.

[0032] Figure 11 is a diagram illustrating an example in which a base station and a terminal transmit and receive non-contiguous carriers within a band including a blank band according to a capability report of the terminal.

[0033] FIG. 12 is a diagram illustrating an example of receiving inter-band non-contiguous carrier aggregation with a single or multiple receivers based on a terminal capability report based on the terminal's supportable bands.

[0034] FIG. 13 is a diagram illustrating an example of receiving intra-band non-contiguous carrier aggregation with a single receiver according to a terminal capability report based on the number of receivers that the terminal can support.

[0035] FIG. 14 is a diagram illustrating an example of receiving inter-band non-contiguous carrier aggregation with a single or multiple receivers according to a terminal capability report based on the number of receivers that the terminal can support.

[0036] FIG. 15 is a diagram illustrating an example in which a base station and a terminal transmit and receive non-contiguous carriers within a band including a blank band according to the terminal's capability and blank band grade report.

[0037] FIG. 16 is a diagram illustrating an example of a base station and a terminal transmitting and receiving non-contiguous carriers between bands that include or do not include a blank band, depending on the terminal's capability and blank band grade report.

[0038] FIG. 17 is a diagram illustrating an example of a non-contiguous carrier combining process in which a base station and a terminal include or do not include a blank band depending on the terminal's capability and blank band class report.

[0039] FIG. 18 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0040] FIG. 19 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0041] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0042] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0043] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0044] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout the specification.

[0045] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0046] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0047] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0048] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (high speed packet access), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE's 802.16e.

[0049] As a representative example of the above broadband wireless communication system, the LTE system adopts the orthogonal frequency division multiplexing (OFDM) method in the downlink (DL) and the single carrier frequency division multiple access (SC-FDMA) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (user equipment (UE) or mobile station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so that orthogonality is established.

[0050] As a future communication system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low-latency communication (URLLC).

[0051] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must provide not only the peak data rate but also the increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz bands.

[0052] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the Internet of Things, mMTC requires supporting the connection of a large number of terminals within a cell, improving terminal coverage, extending battery life, and reducing terminal costs. The Internet of Things provides communication functions by attaching various sensors and various devices, so a large number of terminals (for example, 1,000,000 terminals / km) are required within a cell. 2 ) must be able to support. Furthermore, terminals supporting mMTC are likely to be located in shadow areas not covered by cells, such as basements of buildings, due to the nature of the service, and thus may require wider coverage than other services provided by 5G communication systems. Terminals supporting mMTC must be comprised of low-cost terminals, and because it is difficult to frequently replace the terminal's battery, a very long battery life time, such as 10 to 15 years, may be required.

[0053] Finally, URLLC refers to a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services such as remote control of robots or machinery, industrial automation, unmanaged aerial vehicles, remote health care, and emergency alerts can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and at the same time, a 10 -5The following packet error rate requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a smaller Transmit Time Interval (TTI) than other services, while simultaneously requiring design considerations such as allocating a wide range of resources in the frequency band to ensure communication link reliability.

[0054] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0055] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel form. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0056] [NR time-frequency resources]

[0057] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0058] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

[0059] The horizontal axis of Figure 1 represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE, 101), which can be defined as 1 OFDM symbol (102) on the time axis and 1 subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can constitute one resource block (RB, 104). One subframe (110) on the time axis can include multiple OFDM symbols (102). For example, the length of one subframe can be 1 ms.

[0060] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0061] Figure 2 illustrates an example of a structure of a frame (frame, 200), a subframe (subframe, 201), and a slot (slot, 202). One frame (200) can be defined as 10 ms. One subframe (201) can be defined as 1 ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( ). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In an example of FIG. 2, the cases where the subcarrier spacing setting value μ = 0 (204) and μ = 1 (205) are illustrated. When μ = 0 (204), 1 subframe (201) may be composed of one slot (202), and when μ = 1 (205), 1 subframe (201) may be composed of two slots (203). That is, the number of slots per subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Depending on the subcarrier spacing setting μ and can be defined as [Table 1] below.

[0062]

[0063] [Bandwidth Part (BWP)]

[0064] Next, the bandwidth part (BWP) setting in the 5G communication system will be specifically explained with reference to the drawing.

[0065] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0066] FIG. 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information shown in Table 2 below for each bandwidth portion.

[0067]

[0068] Of course, the above example is not limited, and in addition to the above configuration information, various parameters related to the bandwidth portion may be configured for the terminal. The above information may be transmitted from the base station to the terminal via upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one of the configured bandwidth portions may be activated. Whether or not the configured bandwidth portion is activated may be semi-statically transmitted from the base station to the terminal via RRC signaling or dynamically transmitted via DCI.

[0069] According to some embodiments, a terminal before RRC connection can be configured with an initial bandwidth portion (initial BWP) for initial access from a base station through a master information block (MIB). More specifically, the terminal can receive, during the initial access phase, configuration information about a control resource set (CORESET) and a search space where a PDCCH for receiving system information (which may correspond to remaining system information (RMSI) or system information block 1 (SIB1)) required for initial access can be transmitted through the MIB. The control space and the search space configured by the MIB can each be regarded as an identity (ID) 0. The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control space #0 through the MIB. In addition, the base station can notify the terminal of configuration information about a monitoring period and monitoring occasion for control space #0, i.e., configuration information for search space #0, through the MIB. The terminal may consider the frequency range set as control area #0 obtained from the MIB as the initial bandwidth portion for initial connection. At this time, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0070] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0071] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0072] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0073] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with 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.

[0074] In the method for setting the bandwidth portion, terminals prior to rrc connection can receive configuration information for the initial bandwidth portion (Initial BWP) through the MIB during the initial access phase. More specifically, the terminal can receive a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a system information block (SIB) can be transmitted from the MIB of the PBCH (physical broadcast channel). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive the PDSCH (physical downlink shared channel) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (OSI), paging, and random access.

[0075] [Bandwidth Part (BWP) Change]

[0076] When one or more bandwidth part indicators are set for a terminal, the base station can instruct the terminal to change (or switch, transition) the bandwidth part using the bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently activated bandwidth part of the terminal is bandwidth part #1 (001), the base station can instruct the terminal to bandwidth part #2 (002) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (002) indicated by the bandwidth part indicator in the received DCI.

[0077] As described above, since DCI-based bandwidth part change can be indicated by DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth part change request, it must be able to receive or transmit PDSCH or PUSCH scheduled by the corresponding DCI without difficulty in the changed bandwidth part. To this end, the standard stipulates the delay time (T) required when changing the bandwidth part. BWP ) and can be defined as in Table 3 below, for example.

[0078]

[0079] The bandwidth-partial change delay time requirement supports Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth-partial delay time type to the base station.

[0080] According to the requirement for bandwidth part change delay time mentioned above, when the terminal receives DCI including bandwidth part change indicator in slot n, the terminal changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T. BWP The completion can be done at a later time, and transmission and reception for the data channel scheduled by the DCI can be performed in the new bandwidth portion that has been changed. When the base station wants to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP ), time domain resource allocation for the data channel can be determined. That is, when the base station schedules the data channel with a new bandwidth portion, the data channel can be scheduled after the bandwidth portion change delay time in the method of determining the time domain resource allocation for the data channel. Accordingly, the terminal can determine whether the DCI instructing the bandwidth portion change is after the bandwidth portion change delay time (T BWP) may not be expected to indicate a slot offset (K0 or K2) value smaller than that.

[0081] [QCL,TCIstate]

[0082] In a wireless communication system, one or more different antenna ports (or one or more channels, signals, and combinations thereof, but for convenience, they will be referred to as different antenna ports in the following description of the present disclosure) can be associated with each other by a QCL (Quasi co-location) setting as shown in [Table 4] below. The TCI state is to notify the QCL relationship between the PDCCH (or PDCCH DMRS) and other RSs or channels. When a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are QCLed with each other, it means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at the antenna port A to the channel measurement from the antenna port B. QCL may need to relate different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Accordingly, NR supports four types of QCL relationships, as shown in [Table 4] below.

[0083]

[0084] The above spatial RX parameter may collectively refer to some or all of various parameters, such as angle of arrival (AoA), power angular spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0085] The above QCL relationship can be set to the terminal through the RRC parameters TCI-State and QCL-Info as shown in Table 5 below. Referring to [Table 5], the base station can set one or more TCI states to the terminal and inform the RS referencing the ID of the TCI state, i.e., up to two QCL relationships (qcl-Type1, qcl-Type2) for the target RS. At this time, each QCL information (QCL-Info) included in the above TCI state includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in [Table 4] above.

[0086]

[0087] Figure 4 is a diagram illustrating an example of base station beam allocation according to TCI state settings.

[0088] Referring to FIG. 4, the base station can transmit information about N different beams to the terminal through N different TCI states. For example, in case of N=3 as shown in FIG. 4, the base station can notify that the antenna ports referencing the different TCI states 400, 405, or 410 have different spatial Rx parameters, i.e., are associated with different beams, by setting the qcl-Type2 parameter included in the three TCI states (400, 405, 410) to be associated with the CSI-RS or SSB corresponding to the different beams and to QCL type D.

[0089] Tables 6 to 10 below show valid TCI state settings according to target antenna port type.

[0090] [Table 6] shows valid TCI state settings when the target antenna port is CSI-RS for tracking (i.e., TRS). The TRS refers to NZP CSI-RS with the repetition parameter not set and trs-Info set to true among CSI-RSs. Setting 3 in Table 10 can be used for aperiodic TRS.

[0091]

[0092] [Table 7] shows valid TCI state settings when the target antenna port is a CSI-RS for CSI. The CSI-RS for CSI refers to an NZP CSI-RS in which a parameter indicating repetition (e.g., repetition parameter) is not set among the CSI-RSs and trs-Info is not set to true.

[0093]

[0094] [Table 8] shows the valid TCI state settings when the target antenna port is CSI-RS for beam management (BM, synonymous with CSI-RS for L1 RSRP reporting). The CSI-RS for BM refers to an NZP CSI-RS in which the repetition parameter is set to On or Off among CSI-RSs and trs-Info is not set to true.

[0095]

[0096] [Table 9] shows the valid TCI state settings when the target antenna port is PDCCH DMRS.

[0097]

[0098] [Table 10] shows the valid TCI state settings when the target antenna port is PDSCH DMRS.

[0099]

[0100] A representative QCL setting method according to the above [Table 6] to [Table 10] is to set and operate the target antenna port and reference antenna port for each step as "SSB" -> "TRS" -> "CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS." Through this, it is possible to link statistical characteristics that can be measured from SSB and TRS to each antenna port to assist the terminal's receiving operation.

[0101] [CA / DC related]

[0102] FIG. 5 is a diagram illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation according to an embodiment of the present disclosure.

[0103] Referring to FIG. 5, the wireless protocol of the next-generation mobile communication system is composed of NR SDAP (service data adaptation protocol, 525, 570), NR PDCP (packet data convergence protocol, 530, 565), NR RLC (radio link control, 535, 560), and NR MAC (medium access control, 540, 555) in the terminal and NR base station, respectively.

[0104] The main functions of NR SDAP (525, 570) may include some of the following functions:

[0105] - Transfer of user plane data

[0106] - Mapping function between QoS flow and data bearer for both DL and UL

[0107] - Marking function of QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0108] - Ability to map reflective QoS flow to data bearer for uplink SDAP PDUs (protocol data units).

[0109] For the above SDAP layer device, the terminal can be configured by an RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can instruct the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0110] The main functions of NR PDCP (530, 565) may include some of the following functions:

[0111] - Header compression and decompression (ROHC only)

[0112] - User data transfer function

[0113] - In-sequence delivery of upper layer PDUs

[0114] - Out-of-sequence delivery of upper layer PDUs

[0115] - PDCP PDU reordering for reception

[0116] - Duplicate detection of lower layer SDUs

[0117] - Retransmission function (RETRANSMISSION of PDCP SDUs)

[0118] - Encryption and decryption functions (ciphering and deciphering)

[0119] - Timer-based SDU discard in uplink.

[0120] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order. Alternatively, the reordering function of the NR PDCP device may include a function of transmitting data directly without considering the order, a function of recording lost PDCP PDUs by reordering the order, a function of reporting a status of lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of lost PDCP PDUs.

[0121] The main functions of NR RLC (535, 560) may include some of the following functions:

[0122] - Data transfer function (transfer of upper layer PDUs)

[0123] - In-sequence delivery of upper layer PDUs

[0124] - Out-of-sequence delivery of upper layer PDUs

[0125] - ARQ function (error correction through ARQ)

[0126] - Concatenation, segmentation and reassembly of RLC SDUs

[0127] - Re-segmentation of RLC data PDUs

[0128] - Reordering of RLC data PDUs

[0129] - Duplicate detection function

[0130] - Error detection function (protocol error detection)

[0131] - RLC SDU discard function

[0132] - RLC re-establishment function

[0133] In the above, the in-sequence delivery function of the NR RLC device refers to the function of sequentially delivering RLC SDUs received from a lower layer to an upper layer. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering a single RLC SDU when it is received divided into multiple RLC SDUs, a function of rearranging received RLC PDUs based on an RLC SN (sequence number) or a PDCP SN (sequence number), a function of recording lost RLC PDUs by rearranging the order, a function of reporting a status of lost RLC PDUs to the transmitting side, and a function of requesting retransmission of lost RLC PDUs. The in-sequence delivery function of an NR RLC device may include a function to deliver to the upper layer in sequence only the RLC SDUs up to the lost RLC SDU when there is a lost RLC SDU, or may include a function to deliver to the upper layer in sequence all RLC SDUs received before the timer starts if a predetermined timer has expired even if there is a lost RLC SDU. Alternatively, the in-sequence delivery function of an NR RLC device may include a function to deliver to the upper layer in sequence all RLC SDUs received up to the present if a predetermined timer has expired even if there is a lost RLC SDU.In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a complete RLC PDU, processed, and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0134] The out-of-sequence delivery function of the NR RLC device mentioned above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when an original RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing and arranging the RLC SN or PDCP SN of received RLC PDUs to record lost RLC PDUs.

[0135] NR MAC (540, 555) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0136] - Mapping function (mapping between logical channels and transport channels)

[0137] - Multiplexing / demultiplexing of MAC SDUs

[0138] - Scheduling information reporting function

[0139] - HARQ function (error correction through HARQ)

[0140] - Priority handling between logical channels of one UE

[0141] - Priority handling between UEs by means of dynamic scheduling

[0142] - MBMS service identification function

[0143] - Transport format selection function

[0144] - Padding function

[0145] The NR PHY layer (545, 550) can perform operations of channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

[0146] The above wireless protocol structure can have various detailed structures depending on the carrier (or cell) operation method. For example, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure that has a single structure for each layer, as in 500. On the other hand, when a base station transmits data to a terminal based on CA (carrier aggregation) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure that has a single structure up to RLC, as in 510, but multiplexes the PHY layer through the MAC layer. As another example, when a base station transmits data to a terminal based on DC (dual connectivity) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure that has a single structure up to RLC, as in 520, but multiplexes the PHY layer through the MAC layer.

[0147] [Regarding terminal capability reporting]

[0148] In LTE and NR, a terminal, while connected to a serving base station, can perform a procedure to report its supported capabilities to the base station. In the description below, this is referred to as a UE capability report.

[0149] A base station can transmit a UE capability inquiry message requesting a capability report to a connected terminal. The message can include a UE capability request for each RAT (radio access technology) type of the base station. The UE capability request for each RAT type can include information on a combination of frequency bands supported by the terminal. In addition, in the case of the UE capability inquiry message, UE capabilities for multiple RAT types can be requested at once through a single RRC message container transmitted by the base station, or the base station can include the UE capability inquiry message including the UE capability request for each RAT type multiple times and transmit it to the terminal. That is, the base station can transmit the UE capability inquiry message to the terminal multiple times using one message, and the terminal can compose a corresponding UE capability information message and report it to the base station multiple times. In the next-generation mobile communication system, a UE capability request can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity). Additionally, the terminal capability inquiry message is typically transmitted initially after the terminal is connected to the base station, but the base station may request it under any conditions when necessary.

[0150] In the above step, the terminal that receives the UE capability report request from the base station configures the terminal capability based on the RAT type and band information requested from the base station. Below is a summary of how the terminal configures the UE capability in the NR system.

[0151] 1. If the UE receives a list of LTE and / or NR bands through a UE capability request from the base station, the UE configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, it configures a candidate list of BCs for EN-DC and NR SA based on the bands requested to the base station via FreqBandList. Furthermore, the bands are prioritized in the order listed in FreqBandList.

[0152] 2. If the base station requests UE capability reporting by setting the "eutra-nr-only" flag or the "eutra" flag, the UE completely removes NR SA BCs from the list of configured BC candidates. This operation can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0153] 3. The terminal then removes fallback BCs from the BC candidate list constructed in the above step. Here, a fallback BC is a BC obtained by removing at least one band corresponding to an SCell from a random BC. This step can be omitted because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step are the final "candidate BC list."

[0154] 4. The terminal selects BCs that match the RAT type requested from the base station from the final "candidate BC list", i.e., BCs to be reported. In this step, the terminal constructs the supportedBandCombinationList in a predetermined order. That is, the terminal constructs BCs and UE capabilities to be reported according to the preset rat-Type order (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of "candidate feature set combinations" from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The "candidate feature set combinations" above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0155] 5. Also, if the requested rat Type is eutra-nr and has an effect, featureSetCombinations are included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the NR feature set is included only in UE-NR-Capabilities.

[0156] After terminal capabilities are configured, the terminal transmits a terminal capability information message containing the terminal capabilities to the base station. The base station performs appropriate scheduling and transmission / reception management for the terminal based on the terminal capabilities received from the terminal.

[0157] *[CA bandwidth rating related]

[0158] Intraband contiguous carrier aggregation is a combination that operates in a single operating band, and follows the carrier aggregation bandwidth class (CA bandwidth class) associated with the bandwidth combination set specified in the specification. That is, for intraband contiguous carrier aggregation, the terminal can set and report to the base station multiple bandwidth combination sets supported per carrier combination configuration, as shown in [Table 11], and requirements for all bandwidth combinations included in one bandwidth combination set can be defined. Intraband non-contiguous carrier aggregation is a combination that operates in a single band that includes two or more sub-blocks, and supports the CA bandwidth class defined for each sub-block, as shown in [Table 12] and [Table 13]. Interband carrier aggregation is a carrier aggregation composed of multiple operating bands that support the CA bandwidth class defined for each band.

[0159]

[0160]

[0161]

[0162] For example, CA bandwidth class A in 5G NR is a class that supports a channel bandwidth that is equal to or lower than the maximum channel bandwidth supported by the corresponding configured band with one carrier, CA bandwidth class B is a class that supports a channel bandwidth that is greater than 20 MHz and equal to or lower than 100 MHz with two consecutive carriers, and CA bandwidth class C is a class that supports a channel bandwidth that is greater than 100 MHz and equal to or lower than twice the maximum channel bandwidth supported by the corresponding configured band with two consecutive carriers. Based on the bandwidth classes of consecutive carrier aggregation within such a band, the method of representing non-contiguous carrier aggregation is as follows.

[0163] - [Example 1] Combining non-contiguous carriers within a band: 1(2A) - Configuring two non-contiguous carriers within band 1.

[0164] - [Example 2] Intraband non-contiguous carrier aggregation: 1(AB) - Three contiguous and non-contiguous carriers within band 1.

[0165] - [Example 3] Inter-band carrier aggregation: 1A_3B, one carrier within band 1 and two consecutive carriers within band 3.

[0166] - [Example 4] Inter-band carrier aggregation: 1(2A)_3B, consisting of two non-contiguous carriers within band 1 and two consecutive carriers within band 3.

[0167] <First Embodiment: Method for Setting Terminal Capabilities for Single Receiver Processing>

[0168] [motivation]

[0169] Carrier aggregation (CA) technology combines two or more carriers to efficiently utilize frequencies and improve maximum transmission rates. It originated as a core element of LTE, commonly referred to as 4G, and numerous frequency combinations supporting CA have been defined, leading up to and including 5G. These carrier aggregation technologies can be categorized into three methods, as illustrated in Figures 6 through 8 below.

[0170] FIG. 6 is a diagram illustrating an example of frequency combining between consecutive carriers within the same band (intra-band contiguous CA). Referring to FIG. 6, frequency combining between consecutive carriers within the same band is a technology that enables simultaneous transmission and reception by combining two consecutive carriers to overcome channel bandwidth limitations when continuous frequency usage exceeding the maximum carrier channel bandwidth is possible in the same band, for example, 20 MHz or more for 4G LTE and 100 MHz or more in FR1 (frequency range 1) for 5G NR. By utilizing continuous frequency resources, from a terminal hardware perspective, it is assumed that each carrier is processed as a single receiver depending on the capabilities of the receiver components (e.g., antenna, amplifier, filter, oscillator, etc.), and the RF receiver performance and requirements are defined based on this.

[0171] FIG. 7 is a diagram illustrating an example of intra-band non-contiguous CA (frequency aggregation between non-contiguous carriers within the same band). Referring to FIG. 7, in contrast to the frequency aggregation between consecutive carriers within the same band of FIG. 6, frequency aggregation between non-contiguous carriers within the same band is a technology that allows two non-contiguous carriers to be transmitted and received simultaneously in each cell to increase frequency utilization when non-contiguous frequency use is possible in the same band, for example, when frequencies are empty or exist for different services or cells between frequency blocks held due to differences in frequency auction timing / periods as shown in FIG. 7. In order to minimize interference from other services or cells between non-contiguous frequency resources, from a terminal hardware perspective, each carrier is regarded as a separate band and a separate receiver is assumed for each carrier to process it, and RF reception performance and requirements are defined based on this.

[0172] Figure 8 is a diagram illustrating an example of inter-band carrier aggregation. Referring to Figure 8, similar to the frequency aggregation between non-contiguous carriers within the same band of Figure 7, inter-band carrier aggregation is a technology that enables simultaneous transmission and reception of carriers for each band in each cell across multiple bands. From a terminal hardware perspective, it is assumed that a separate receiver is placed for each carrier to process it, and RF reception performance and requirements are defined based on this.

[0173] However, in the case of frequency combining between non-contiguous carriers within some of the same bands, although processing is possible with a single receiver depending on the aggregated channel bandwidth of the combined frequencies, since the carrier combining performed by the existing base station or the operation of receiving it at the terminal was assumed as above, the combining of such non-contiguous carriers was limited in consideration of the limitations of the terminal receiver.

[0174] For example, in a band with a total bandwidth of 100 MHz as in Fig. 9 (901), when the combined bandwidth size between the lowest and highest frequencies of two non-contiguous carriers to be transmitted is 70 MHz (902), the combination is smaller than the maximum channel bandwidth based on 5G FR1, but two receivers are required due to terminal assumptions and specifications, and the combination of additional non-contiguous carriers may be limited depending on the number of receivers that the terminal can carry and the total number of receivers. This limitation is an obstacle to sufficiently utilizing non-contiguous frequencies where carrier aggregation transmission is possible, and has been recognized as a major obstacle in frequency auctions or allocations.

[0175] In the following embodiments, various terminal capability reporting methods for a terminal that enable a terminal to receive multiple non-contiguous carriers with a single receiver, and operations of a terminal and a base station according to the terminal capability reporting methods are specifically described.

[0176] If a terminal can process multiple non-contiguous carriers within the same band with a single receiver, there are two main ways for a base station to transmit the signals. The first is a method in which, like the existing carrier aggregation transmission as shown in FIG. 10, the base station or cell is distinguished for each carrier, that is, the primary cell (1001) and the secondary cell (1002) are distinguished, and the signals are transmitted to the terminal. The second is a method in which, like FIG. 11, two carriers are transmitted as a single cell including a frequency gap (1101) between them as a single carrier (1102). First, in the first embodiment, it is assumed that, like the existing carrier aggregation transmission, the base station transmits multiple non-contiguous carriers by distinguishing the base station or cell for each carrier, and the terminal operation and terminal capability reporting methods to support this are described.

[0177] In one embodiment of the present disclosure, the term "receiver" is used for convenience, but this is not limited to a physical receiving block (receiver), and may refer to an Rx (reception) chain corresponding to a single independent receiving path within a terminal. In addition, the single receiver and multiple receivers of the present disclosure may refer to one Rx chain and multiple Rx chains, respectively.

[0178] - [Method 1-1] When a terminal configures bands in which it can receive multiple carriers with a single receiver and reports them to the base station: The terminal can report bands in which it can receive two or more non-contiguous carriers within a band with a single receiver to the base station through a new terminal capability, for example, [singleRxChain]. When the terminal is instructed by the base station to receive multiple carriers within the band, the terminal can process the multiple carriers with a single receiver and apply a performance relaxation value, for example, [ΔRsc], that may be acceptable for some reception requirements. In this case, the base station can transmit multiple non-contiguous carriers by distinguishing the base station or cell for each carrier based on the frequency combination support list reported by the terminal, as before. However, it can be recognized that when the terminal transmits non-contiguous carrier combination in the band reported through [singleRxChain], some downlink performances may be affected by [ΔRsc].

[0179] For example, when a terminal supports a combination of two non-contiguous carriers within band 25 (B25 or n25) such as 10 and reports a new terminal capability, say band 25 to the base station via [singleRxChain] (1003), the terminal processes the non-contiguous multiple carriers occurring in the band as a single receiver and applies an additional reception performance relaxation value [ΔRsc]. At this time, the base station transmits two non-contiguous carriers less than the maximum channel bandwidth within band 25, such as B25(2A), to each cell (1001, 1002), and can recognize that there may be a downlink performance relaxation of [ΔRsc] for the band combination, such as B25(2A), within band 25 reported by the terminal via [singleRxChain]. And, according to one embodiment of the present disclosure, the base station may, or may not, instruct the terminal to perform carrier aggregation in order to communicate with the terminal by adding more downlink carriers through a scheduler based on the state of the downlink channel and the result of carrier aggregation reception of the terminal.

[0180] As an extension of this example, a case where a combination of non-contiguous carriers within the same band is combined with carriers in other bands, as shown in FIG. 12, can also be considered. As with FIG. 10, the terminal can receive multiple non-contiguous carriers with a single receiver and adjust the reception performance thereof, but only for the bands reported to the base station by the terminal through the new terminal capability [singleRxChain]. For example, if a terminal supports two combinations of non-contiguous carriers in each of band 25 (B25 or n25) and band 41 (B41 or n41) (1201, 1202) and reports only band 25 to the base station through a new terminal capability [singleRxChain] (1203), the terminal can process only the non-contiguous multiple carriers B25(2A) occurring in band 25 with one receiver and apply an additional reception performance relaxation value [ΔRsc] for band 25. Conversely, the terminal can process the non-contiguous multiple carriers B41(2A) occurring in band 41 that were not reported with two receivers and cannot apply an additional performance relaxation for band 41. In this case, the base station transmits the same band non-contiguous carriers to each cell (1204, 1205, 1206, 1207), and it can be expected that there will be a downlink performance relaxation of [ΔRsc] only for the band combination such as B25(2A) reported by the terminal as [singleRxChain]. And, according to one example of the present disclosure, the base station may instruct the terminal to perform carrier aggregation by adding more downlink carriers through the scheduler according to the state of the downlink channel and the result of the carrier aggregation reception of the terminal to communicate with the terminal, or may not instruct the terminal to perform carrier aggregation.

[0181] - [Method 1-2] When the terminal sets the number of receivers capable of receiving multiple carriers with one receiver and reports this to the base station: The terminal can report the number of receivers capable of receiving non-contiguous carriers within one or more respective bands to the base station through a new terminal capability [maxSingleRxChain], and when non-contiguous carriers included within the one or more respective bands are received with one receiver within each band, a performance relaxation value [ΔRsc] allowed for some reception requirements can be applied to each band or to inter-band carrier aggregation. For example, the terminal can apply the performance relaxation value according to the number of bands or the number of receivers that have received multiple non-contiguous carriers. For example, a) if there is one band containing discontinuous carriers and the band is received through one new receiver, the performance relaxation value may be applied to the band or to one receiver, and b) if there are two bands containing discontinuous carriers and the bands are each received through two new receivers, the performance relaxation value may be applied to each of the two bands or to the two receivers. In this case, the base station may transmit multiple discontinuous carriers by distinguishing base stations or cells by carrier based on the frequency combination support list reported by the terminal as before, and may recognize that some downlink performance may be affected by [ΔRsc]. In addition, according to one embodiment of the present disclosure, the base station may instruct the terminal to perform carrier aggregation in order to communicate with the terminal by adding more downlink carriers through the scheduler according to the state of the downlink channel and the carrier aggregation reception result of the terminal, or may not instruct the terminal to perform carrier aggregation.

[0182] For example, when a terminal supports a combination of two non-contiguous carriers within band 25 (B25 or n25) such as 13 (1301) and reports the number of receivers 1 to the base station through a new terminal capability [maxSingleRxChain] (1302), the terminal processes the non-contiguous multiple carriers occurring in the band as a single receiver and applies an additional reception performance relaxation value [ΔRsc]. At this time, the base station transmits two non-contiguous carriers less than the maximum channel bandwidth within band 25 such as B25 (2A) to each cell (1303, 1304), and compares the number of receivers reported by the terminal through [maxSingleRxChain] with the number of non-contiguous carrier combinations, and can recognize that there may be a downlink performance relaxation of the corresponding [ΔRsc].

[0183] As an extension to this example, a case where a combination of non-contiguous carriers within the same band is combined with carriers in other bands, as in FIG. 14, can also be considered, and similarly to the case of FIG. 13, the terminal can receive multiple non-contiguous carriers as a single receiver and adjust the corresponding reception performance only up to the number of receivers reported to the base station through the new terminal capability [maxSingleRxChain]. For example, if the terminal supports two combinations of non-contiguous carriers in each of band 25 (B25 or n25) and band 41 (B41 or n41) (1401, 1402) and reports only one receiver to the base station through the new terminal capability [maxSingleRxChain] (1403), the terminal can process multiple non-contiguous carriers occurring in band 25 or 41 as a single receiver and apply an additional reception performance relaxation value [ΔRsc] corresponding to the single receiver. On the other hand, for the non-contiguous carriers in the remaining one of the two bands, each carrier is processed by the other two receivers, and no additional performance relaxation can be applied in the band where each carrier is processed by the other two receivers. And the base station transmits the same band non-contiguous carriers to each cell (1404, 1405, 1406, 1407), and it can be expected that there can be downlink performance relaxation of [ΔRsc] only for the number of receivers reported by the terminal as [maxSingleRxChain]. And according to one embodiment of the present disclosure, the base station can instruct the terminal to perform carrier aggregation by adding more downlink carriers through the scheduler according to the state of the downlink channel and the result of the carrier aggregation reception of the terminal to communicate with the terminal, or not.

[0184] In summary, in the method of a base station transmitting each carrier using multiple cells, a method in which a terminal reports to the base station a band in which multiple carriers can be processed by a single receiver through new terminal capabilities ([Method 1-1]) and a method in which, instead of such available bands, the number of receivers capable of processing multiple carriers by a single receiver is reported to the base station ([Method 1-2]).

[0185] However, in the method of reporting the available band to the base station through the terminal capability, the band for receiving it is fixed, so it is difficult for the terminal to change the receiving method or receiver according to the channel situation when receiving a combination of non-contiguous carriers within the band, whereas in the method of reporting the number of receivers instead of the exact supported band, the supported band is not specified, so if the number of receivers that can process multiple non-contiguous carriers with one receiver is less than the number of bands set as non-contiguous carrier combinations within the band, there may be an advantage in that the degree of implementation freedom can be increased so that receivers supporting these bands can be autonomously supported according to the situation for each band.

[0186] <Second embodiment: Method for transmitting and receiving multiple non-contiguous carriers as if they were a single carrier>

[0187] Hereinafter, as illustrated in FIG. 11, a method is described in which a base station transmits two carriers to a terminal as if they were a single carrier, that is, from the lowest frequency to the highest frequency among the two carriers, at the same time, and the terminal receives the carriers as if they were a single carrier. A method in which a terminal reports to the base station a list of non-contiguous frequency combinations that can be processed by a single receiver and whether or not they are supported through a blank band class and terminal capability that can be additionally defined based on the size of the blank band, and a method in which the base station transmits two or more non-contiguous carrier combinations in the supportable list as a single carrier are specifically described.

[0188] As described above, a terminal can report a list of frequency combinations it supports based on a defined CA bandwidth class, and a base station can configure carrier aggregation based on this. In addition, if a base station wants to transmit on a single carrier in a cell for a specific non-contiguous carrier combination within a band reported by a terminal, in addition to the CA bandwidth classes defined for existing intra-band carrier aggregation, a new class definition for intra-band carrier combinations, such as an integrated bandwidth class or a gap class, may be required. In addition, a new terminal capability reporting method for reporting whether a terminal supports it to a base station may also be defined. In this disclosure, possible methods are examined when a new gap band class is added, and based on the terminal reporting methods mentioned in the first embodiment, a method for a terminal to report to a base station a list of non-contiguous frequency combinations that can be processed by a single receiver and whether they are supported by the base station is described as an example, and a method for a base station to transmit two or more non-contiguous carrier combinations in the supportable list as a single carrier through this method.

[0189] In order for a base station to transmit non-contiguous carriers within the same band as a single carrier, including blank bands, as described in the first embodiment, the terminal can self-configure and report bands in which the signal can be received by a single receiver, or can report the number of receivers to the base station, or can simply report that it supports the capability without any of the above. Such terminal capabilities and a list of supported frequency combinations based on the new blank band class can be reported to the base station together.

[0190] The gap band class can be defined by dividing the size of the frequency gap between multiple non-contiguous carriers into a certain grade, and the method of naming the gap band size between two carriers or the size or method of determining the grade can be replaced with other methods. By utilizing these gap band classes, the terminal can set the integrated bandwidth size including the gap band that can be supported according to the receiver capability of the terminal and report it to the base station, and the base station can also transmit the non-contiguous carrier aggregation within the band based on the gap band class and CA bandwidth class set by the terminal. These gap band classes can be defined as in [Table 14], and can be set by indicating them together with the CA bandwidth class, as in the following examples. The examples below are merely examples, and the non-contiguous carrier aggregation within the band can be set together with the gap band class and reported to the base station in other ways.

[0191]

[0192] - [Example 2-1] When transmitting two Class A carriers separated by 50 MHz or less in Band 1 as a single carrier: 1 (2A1)

[0193] - [Example 2-2] When transmitting Class A and Class B carriers separated by 100 MHz or less in Band 1 as a single carrier: 1 (A-B2)

[0194] - [Example 2-3] When transmitting two Class A carriers separated by less than 50 MHz in Band 1 as a single carrier and transmitting a Class B carrier in Band 3 together: 1(2A1)_3B

[0195] When the non-contiguous carrier combination set as above is reported to the base station through the terminal capability report, the base station can transmit the combination to the terminal in one cell by bundling it as a single carrier including the blank band between the two carriers, and the terminal can receive the signal with a single receiver. In addition, when the band is received with a single receiver in this way, a performance relaxation value allowed for some reception requirements, such as [ΔRsc], can be applied, and at the same time, the base station can recognize that when transmitting the combination according to the terminal capability report of the terminal, some downlink performance may be affected by [ΔRsc].

[0196] For example, when a terminal supports two carrier combinations as 25(2A1) within band 25 (B25 or n25) such as 15 (1501) and reports to the base station whether it can support them through a new terminal capability [singleRxChain] (1502), and the base station configures the terminal to receive the carrier combination corresponding to 25(2A1), the terminal processes a single consecutive carrier generated based on 25(2A1) as a single receiver and applies an additional reception performance relaxation value [ΔRsc]. The base station may transmit as one cell and consecutive carriers, including non-contiguous carriers within band 25 and the blank band therebetween (1503), and may take into account that the terminal may apply some reception requirements relaxed by [ΔRsc].

[0197] As an extension concept to this example, a case where a combination of non-contiguous carriers within the same band is combined with carriers in other bands, as in FIG. 16, can also be considered. In this case as well, if the terminal adds a supportable blank band class to the list of frequency combinations and reports whether it can be supported with the terminal capability [singleRxChain], the terminal can receive multiple non-contiguous carriers transmitted as a combination of consecutive carriers with a single receiver, and adjust the reception performance thereof, only for the band. For example, when a terminal supports two non-contiguous carrier combinations in each of band 25 (B25 or n25) (1601) and band 41 (B41 or n41) (1602), and reports to the base station a new terminal capability [singleRxChain] and a supportable frequency combination including a blank band class as 25(2A1)_41(2A) (1603), the terminal may process one carrier transmitted in band 25 with one receiver and apply an additional reception performance relaxation value [ΔRsc]. Conversely, the terminal may process each carrier in band 41 with two receivers as is and may not apply an additional performance relaxation. In this case, it can be expected that the base station can transmit a downlink signal as a single continuous carrier combination including a blank band only for the band set to B25 (2A1) (1604), and the terminal can apply a relaxation of the downlink reception requirement by [ΔRsc].

[0198] To summarize the above embodiments, the method by which a terminal can process non-contiguous carriers within a band with a single receiver can be broadly divided into two methods: a method in which a base station transmits each carrier using multiple cells and the terminal receives the two carriers, and a method in which the base station transmits the two carriers simultaneously from the lowest frequency to the highest frequency among the two carriers as if they were a single carrier and the terminal receives the carriers as if they were a single carrier. In this case, the terminal can set a band and a band combination that can be received as a single carrier including a blank band and report this to the base station, and can report a supportable frequency combination based on a blank band grade that can be newly defined together with a previously defined CA bandwidth grade.

[0199] Here, terminal capabilities such as [singleRxChain] may or may not be utilized for base station and terminal operations in the present embodiment. If terminal capabilities such as [singleRxChain] are not considered, the base station sets whether to transmit to multiple cells or carriers or to a single cell or carrier according to the combined bands and corresponding bandwidth classes supported by the terminal, and the terminal receives with one or more receivers according to the bandwidth combination set by the base station and applies reception requirements accordingly.

[0200] If it is assumed that the new bandwidth class and terminal capability can be utilized simultaneously, the base station sets whether to transmit in multiple cells or carriers or in a single cell or carrier based on the combination bands and corresponding bandwidth classes supported by the terminal based on the new CA bandwidth class and the blank band class depending on the terminal capability, and the terminal receives in one or more receivers according to the bandwidth combination set by the base station, and can apply some reception requirements that are relaxed to the extent of [ΔRsc].

[0201] The above examples may be named differently or set in different formats for specific terminal capability settings and integrated non-contiguous carrier aggregation settings, and the non-contiguous carrier aggregation method included in the present invention may be applied not only to carrier aggregation (CA) but also to dual aggregation (DC).

[0202] <Third embodiment: Overall operation including method for checking whether terminal is supported>

[0203] In this embodiment, based on the non-contiguous carrier aggregation transmission method within the same band described so far, a method for setting a new blank band class and the overall flow of information exchange and corresponding operations between the base station and the terminal described in the above embodiment are described.

[0204] To define and set the gap band class, a gap band class indicator, such as CA-FreqGapClass, can be defined as in the example in [Table 15].

[0205]

[0206] Based on this, an example of a report of a bandwidth gap class for each band that can be set as BandParameters in the terminal along with the CA bandwidth class, for example, ca-FreqGapClass6G, is as shown in [Table 16] below.

[0207]

[0208] As shown in [Table 16], in the band parameters (BandParameters) containing terminal capability information such as bandwidth class for each band within the frequency combination, a blank band class to support non-contiguous carrier combination for each band can be added to report terminal capability information for each band to the base station.

[0209] The new RRC parameters or terminal capabilities proposed in this embodiment may be replaced with band groups / grades / ranges, etc., and other parameters named in the embodiment may also be replaced with other terms.

[0210] FIG. 17 is a flowchart illustrating an example of operations of a terminal and a base station, in which, when a terminal can receive a non-contiguous carrier combined signal with a single receiver, the terminal transmits the corresponding terminal capability to a base station through [singleRxChain] and reports a frequency combination support list including a blank band grade, and the base station transmits a plurality of non-contiguous carriers and the blank band therebetween as one cell or carrier, as described in the second embodiment.

[0211] As shown in Fig. 17, first, so that the base station can transmit multiple non-contiguous carriers together including the blank bands therebetween, the terminal reports the list of supported carrier combinations including the blank band grades when indicating the band combinations supported by the terminal as CA bandwidth grades by band (1701).

[0212] At the same time, the terminal can report to the base station whether it can receive the corresponding downlink carrier with a single receiver, for example, through a new terminal capability called [singleRxChain] (1702).

[0213] For example, when the terminal reports the terminal capability [singleRxChain] as true, for example, 1 (1703), the base station can set the terminal to 'single cell downlink transmission of non-contiguous carriers' mentioned in the second embodiment among the carrier combination list supported by the terminal through RRC configuration (1704).

[0214] And then, when transmitting non-contiguous carriers of the corresponding band to the terminal, the base station can transmit them as a single carrier, including the blank band (1705). At this time, if the base station does not set a combination that supports the corresponding operation in the corresponding band to the terminal, the base station performs general non-contiguous carrier combined transmission in the corresponding band (1706).

[0215] When a terminal receives a corresponding carrier with a single receiver (1707), some reception requirements of the terminal, such as reference sensitivity, adjacent channel selectivity, and in-band blocking, may be subject to a separately defined relaxation level, e.g., [ΔRsc] (1708). On the other hand, when the terminal receives non-contiguous carriers included in a band with each receiver (e.g., when receiving a general non-contiguous carrier combination), (1709) the terminal does not apply the relaxation value to each receiver that receives the band or non-contiguous carriers within the band. (1710)

[0216] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, individual steps may be omitted or replaced with other steps.

[0217] FIG. 18 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0218] Referring to FIG. 18, the terminal may include a transceiver, which refers to a terminal receiving unit (1800) and a terminal transmitting unit (1810), a memory (not shown), and a terminal processing unit (1805, or a terminal control unit or processor). The transceiver units (1800, 1810), the memory, and the terminal processing unit (1805) of the terminal may operate according to at least one or a combination of the methods corresponding to the above-described embodiments. However, the components of the terminal are not limited to the illustrated examples. For example, according to other embodiments, the terminal may include more or fewer components than the above-described components. In addition, in certain cases, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0219] The transceiver (1800, 1810) can transmit and receive signals with a base station. Here, the signals may include control information and data. To this end, the transceiver may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0220] Additionally, the transceiver unit can receive a signal through a wireless channel and output it to the processor (1805), and transmit a signal output from the processor through the wireless channel.

[0221] Memory can store programs and data necessary for the terminal's operation. Furthermore, memory can store control information or data included in signals transmitted and received by the terminal. Memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0222] Additionally, the processor (1805) may control a series of processes to enable the terminal to operate according to the aforementioned embodiments. For example, the processor may perform or control operations of the terminal to perform at least one or a combination of methods according to embodiments of the present disclosure. There may be multiple processors, and the processors may perform component control operations of the terminal by executing programs stored in memory.

[0223] FIG. 19 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0224] Referring to FIG. 19, the base station may include a transceiver, which refers to a base station receiver (1900) and a base station transmitter (1910), a memory (not shown), and a base station processor (1905, or a base station control unit or processor). The transceiver (1900, 1910), the memory, and the base station processor (1905) of the base station may operate according to at least one of the methods corresponding to the above-described embodiments or a combination thereof. However, the components of the base station are not limited to the illustrated examples. For example, according to other embodiments, the base station may include more or fewer components than the components described above. In addition, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0225] The transceiver (1900, 1910) can transmit and receive signals with the terminal. Here, the signals may include control information and data. To this end, the transceiver may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0226] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor (1905), and transmit the signal output from the processor through the wireless channel.

[0227] The memory can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0228] The processor (1905) may 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 processor may perform or control the operations of the base station to perform at least one or a combination of the methods according to the embodiments of the present disclosure. There may be multiple processors, and the processors may perform component control operations of the base station by executing programs stored in memory.

[0229] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0230] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0231] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0232] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0233] In the specific embodiments of the present disclosure described above, components included in the invention are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0234] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are only specific examples to easily explain the technical contents of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the above-mentioned embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment can be combined with each other to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been presented based on an FDD LTE system, other modifications based on the technical idea of ​​the above-mentioned embodiments can be implemented with other systems such as a TDD LTE system, 5G, or NR system.

[0235] Meanwhile, the order of description in the drawings explaining the method of the present invention does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0236] Alternatively, the drawings illustrating the method of the present invention may omit some components and include only some components within a scope that does not harm the essence of the present invention.

[0237] In addition, the method of the present invention may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the invention.

[0238] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of transmitting information about a band in which a non-contiguous carrier combination can be received to a base station, wherein an integrated bandwidth between the lowest frequency and the highest frequency of the non-contiguous carrier combination is smaller than the bandwidth of the band; A step of receiving, from the base station, setting information instructing to receive the non-contiguous carrier combination in the band; and A method of a terminal, comprising: receiving the non-contiguous carrier combination in the band from the base station through one Rx (reception) chain capable of processing the integrated bandwidth; 2. In paragraph 1, The information about the band includes information about a band capable of receiving a non-contiguous carrier combination with the one Rx chain or information about the number of Rx chains capable of receiving a non-contiguous carrier combination in the band, and A terminal method, characterized in that the carriers of the above non-contiguous carrier combination are transmitted from different cells.

3. In paragraph 1, The above non-contiguous carrier combination is received with the reception requirements associated with the one Rx chain applied, and A method of a terminal, wherein the above reception requirements include at least one of reference sensitivity, adjacent channel selectivity, and in-band blocking.

4. In paragraph 1, Further comprising a step of transmitting information about a band combination supported by the terminal to the base station; The information about the above band combination includes information about the bandwidth class of the above non-contiguous carrier combination and information about the gap bandwidth between carriers of the above non-contiguous carrier combination, The above information about the above blank bandwidth indicates a predefined blank bandwidth class, The above non-contiguous carrier combination is transmitted based on the above information about the bandwidth class and the above information about the blank bandwidth, and A method of a terminal, characterized in that the above non-contiguous carrier combination is transmitted in one cell.

5. In a method performed by a base station in a wireless communication system, A step of receiving information about a band capable of receiving a non-contiguous carrier combination from a terminal, wherein an integrated bandwidth between the lowest frequency and the highest frequency of the non-contiguous carrier combination is smaller than the bandwidth of the band; A step of transmitting setting information instructing the terminal to receive the non-contiguous carrier combination in the band; and A step of transmitting the non-contiguous carrier combination in the band to the terminal; A method of a base station, characterized in that the above non-contiguous carrier combination is received through one Rx (reception) chain capable of processing the integrated bandwidth of the terminal.

6. In paragraph 5, The information about the band includes information about a band capable of receiving a non-contiguous carrier combination with the one Rx chain or information about the number of Rx chains capable of receiving a non-contiguous carrier combination in the band, and A method of a base station, characterized in that the carriers of the above non-contiguous carrier combination are transmitted from different cells.

7. In paragraph 5, The above non-contiguous carrier combination is received with the reception requirements associated with the one Rx chain applied, and A method of a base station, wherein the above reception requirements include at least one of reference sensitivity, adjacent channel selectivity, and in-band blocking.

8. In paragraph 5, Further comprising a step of receiving information about a band combination supported by the terminal from the terminal; The information about the above band combination includes information about the bandwidth class of the above non-contiguous carrier combination and information about the gap bandwidth between carriers of the above non-contiguous carrier combination, The above information about the above blank bandwidth indicates a predefined blank bandwidth class, The above non-contiguous carrier combination is transmitted based on the above information about the bandwidth class and the above information about the blank bandwidth, and A method of a base station, characterized in that the above non-contiguous carrier combination is transmitted in one cell.

9. In a wireless communication system, at the terminal, transceiver; A processor connected to enable communication with the above transceiver; and Connected to the processor so as to be communicatively connected to the processor, and executable by the processor, the terminal, Transmitting information about a band in which a non-contiguous carrier combination can be received to a base station, wherein the integrated bandwidth between the lowest frequency and the highest frequency of the non-contiguous carrier combination is smaller than the bandwidth of the band; Receives from the base station setting information instructing to receive the non-contiguous carrier combination in the band, and A terminal comprising a memory storing commands that cause the non-contiguous carrier combination to be received in the band through one Rx (reception) chain capable of processing the integrated bandwidth from the base station.

10. In paragraph 9, The information about the band includes information about a band capable of receiving a non-contiguous carrier combination with the one Rx chain or information about the number of Rx chains capable of receiving a non-contiguous carrier combination in the band, and A terminal characterized in that the carriers of the above non-contiguous carrier combination are transmitted from different cells.

11. In paragraph 9, The above non-contiguous carrier combination is received with the reception requirements associated with the one Rx chain applied, and A terminal, characterized in that the above reception requirements include at least one of reference sensitivity, adjacent channel selectivity, and in-band blocking.

12. In paragraph 9, The above commands further cause the terminal to transmit, to the base station, information about the band combinations supported by the terminal, The information about the above band combination includes information about the bandwidth class of the above non-contiguous carrier combination and information about the gap bandwidth between carriers of the above non-contiguous carrier combination, The above information about the above blank bandwidth indicates a predefined blank bandwidth class, The above non-contiguous carrier combination is transmitted based on the above information about the bandwidth class and the above information about the blank bandwidth, and A terminal characterized in that the above non-contiguous carrier combination is transmitted in one cell.

13. In a wireless communication system, at a base station, transceiver; A processor connected to enable communication with the above transceiver; and Connected to the processor so as to be communicatively connected to the processor, and executable by the processor, the base station, Receive information about a band capable of receiving a non-contiguous carrier combination from a terminal, wherein the integrated bandwidth between the lowest frequency and the highest frequency of the non-contiguous carrier combination is smaller than the bandwidth of the band; Transmitting configuration information instructing the terminal to receive the non-contiguous carrier combination in the band, and A memory storing commands for transmitting the non-contiguous carrier combination in the band to the terminal; A base station, characterized in that the above non-contiguous carrier combination is received through one Rx (reception) chain capable of processing the integrated bandwidth of the terminal.

14. In paragraph 13, The information about the above band includes information about a band capable of receiving a non-contiguous carrier combination with the one Rx chain or information about the number of Rx chains capable of receiving a non-contiguous carrier combination in the band, The carriers of the above non-contiguous carrier combination are transmitted in different cells, The above non-contiguous carrier combination is received with the reception requirements associated with the one Rx chain applied, and A base station, wherein the above reception requirements include at least one of reference sensitivity, adjacent channel selectivity, and in-band blocking.

15. In paragraph 13, The above commands further cause the base station to receive, from the terminal, information about the band combinations supported by the terminal, The information about the above band combination includes information about the bandwidth class of the above non-contiguous carrier combination and information about the gap bandwidth between carriers of the above non-contiguous carrier combination, The above information about the above blank bandwidth indicates a predefined blank bandwidth class, The above non-contiguous carrier combination is transmitted based on the above information about the bandwidth class and the above information about the blank bandwidth, and A base station, characterized in that the above non-contiguous carrier combination is transmitted in one cell.

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