Apparatus and method for transmitting and receiving signal in wireless communication system

Abstract

The present disclosure relates to a method for operating a terminal in a wireless communication system, comprising the steps of: transmitting terminal capability information to a base station, the terminal capability information including dual communication support capability and nonlinear interference cancellation capability information; performing a radio resource control (RRC) connection procedure with the base station, and acquiring, through the RRC connection procedure, information related to a transmission mode determined on the basis of the terminal capability information; and performing communication with the base station on the basis of the information related to the transmission mode, wherein the transmission mode can be one from among a first transmission mode, which is a half-duplex radio mode, a second transmission mode, which is a full-duplex radio mode using linear self-interference cancellation, and a third transmission mode, which is a full-duplex radio mode using the linear self-interference cancellation and nonlinear self-interference cancellation.

Description

Device and method for transmitting and receiving signals in a wireless communication system

[0001] The following description relates to a wireless communication system supporting a full-duplex radio (FDR) mode, and to a device and method for transmitting and receiving signals in a wireless communication system.

[0002] Wireless access systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless access systems are multiple access systems that support communications with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA).

[0003] In particular, as numerous communication devices demand greater communication capacity, enhanced mobile broadband (eMBB) communication technologies are being proposed, improving upon existing radio access technology (RAT). Furthermore, massive machine type communications (mMTC), which connects numerous devices and objects to provide diverse services anytime and anywhere, as well as communication systems that consider reliability and latency-sensitive services / user equipment (UE), are being proposed. Various technological configurations are being proposed for these purposes.

[0004] The present disclosure may provide a device and method for transmitting and receiving a signal in a wireless communication system.

[0005] The present disclosure may provide a device and method supporting a full-duplex radio (FDR) mode in a wireless communication system.

[0006] The present disclosure can provide a device and method for determining a transmission mode based on capability information of a terminal in a wireless communication system.

[0007] The present disclosure can provide a device and method for transmitting capability information of a terminal through an RRC (radio resource control) connection procedure in a wireless communication system.

[0008] The present disclosure can provide a device and method for transmitting capability information of a terminal in an index form using a codebook in a wireless communication system.

[0009] The present disclosure can provide a device and method for determining a transmission mode based on a dual communication support capability and nonlinear interference rejection capability of a terminal in a wireless communication system.

[0010] The present disclosure can provide a device and method for updating a transmission mode based on whether self-interference is overcome in a wireless communication system.

[0011] The present disclosure may provide a device and method for determining a situation in which nonlinear interference cancellation is required in a wireless communication system.

[0012] The present disclosure relates to a device and method for transmitting a plurality of transport blocks (TBs) as a single unit in a wireless communication system.

[0013] The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical tasks not mentioned can be considered by a person having ordinary skill in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure described below.

[0014] As an example of the present disclosure, a method for operating a terminal in a wireless communication system includes the steps of transmitting terminal capability information to a base station, wherein the terminal capability information includes dual communication support capability and nonlinear interference cancellation capability information, performing an RRC (radio resource control) connection procedure with the base station, obtaining information on a transmission mode determined based on the terminal capability information through the RRC connection procedure; and transmitting and receiving data with the base station based on the information on the transmission mode, wherein the transmission mode may be one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear self-interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear self-interference cancellation and nonlinear self-interference cancellation.

[0015] As an example of the present disclosure, a method of operating a base station in a wireless communication system includes a step of receiving terminal capability information from a terminal, wherein the terminal capability information includes dual communication support capability and nonlinear interference cancellation capability information, a step of performing an RRC (radio resource control) connection procedure with the terminal, a step of transmitting information on a transmission mode determined based on the terminal capability information to the terminal through the RRC connection procedure, and a step of transmitting and receiving data with the terminal based on the information on the transmission mode, wherein the transmission mode may be one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear self-interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear self-interference cancellation and nonlinear self-interference cancellation.

[0016] As an example of the present disclosure, in a wireless communication system, a terminal includes a transceiver and a processor connected to the transceiver, wherein the processor transmits terminal capability information to a base station, wherein the terminal capability information includes dual communication support capability and nonlinear interference cancellation capability information, performs an RRC (radio resource control) connection procedure with the base station, acquires information on a transmission mode determined based on the terminal capability information through the RRC connection procedure, and controls to transmit and receive data with the base station based on the information on the transmission mode, wherein the transmission mode may be one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear self-interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear self-interference cancellation and nonlinear self-interference cancellation.

[0017] As an example of the present disclosure, in a wireless communication system, a base station includes a transceiver and a processor connected to the transceiver, wherein the processor receives terminal capability information from a terminal, wherein the terminal capability information includes dual communication support capability and nonlinear interference cancellation capability information, performs an RRC (radio resource control) connection procedure with the terminal, and transmits information on a transmission mode determined based on the terminal capability information to the terminal through the RRC connection procedure; and controls data transmission and reception with the terminal based on the information on the transmission mode, wherein the transmission mode may be one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear self-interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear self-interference cancellation and nonlinear self-interference cancellation.

[0018] As an example of the present disclosure, a communication device includes at least one processor, and at least one computer memory connected to the at least one processor and storing instructions that direct operations when executed by the at least one processor, the operations including: transmitting terminal capability information to a base station, wherein the terminal capability information includes dual communication support capability and nonlinear interference cancellation capability information; performing an RRC (radio resource control) connection procedure with the base station, obtaining information about a transmission mode determined based on the terminal capability information through the RRC connection procedure; and transmitting and receiving data with the base station based on the information about the transmission mode, wherein the transmission mode may be one of a first transmission mode that is a half-duplex transmission mode, a second transmission mode that is a full-duplex transmission mode using linear self-interference cancellation, and a third transmission mode that is a full-duplex transmission mode using linear self-interference cancellation and nonlinear self-interference cancellation.

[0019] As an example of the present disclosure, a non-transitory computer-readable medium storing at least one instruction, the at least one instruction being executable by a processor, the at least one instruction causing a device to transmit terminal capability information to a base station, the terminal capability information including dual communication support capability and nonlinear interference cancellation capability information, perform an RRC (radio resource control) connection procedure with the base station, and acquire information about a transmission mode determined based on the terminal capability information through the RRC connection procedure; and control to transmit and receive data with the base station based on the information about the transmission mode, the transmission mode being one of a first transmission mode that is a half-duplex transmission mode, a second transmission mode that is a full-duplex transmission mode using linear self-interference cancellation, and a third transmission mode that is a full-duplex transmission mode using linear self-interference cancellation and nonlinear self-interference cancellation.

[0020] The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present disclosure to be described below.

[0021] The following effects may be achieved by embodiments based on the present disclosure.

[0022] According to the present disclosure, in a wireless communication system, a terminal and a base station can efficiently transmit and receive signals based on the terminal's interference cancellation capability.

[0023] According to the present disclosure, by selectively using nonlinear interference cancellation capability in a wireless communication system, the power efficiency of a terminal using a full-duplex transmission mode can be increased.

[0024] According to the present disclosure, a terminal and a base station can efficiently utilize a full-duplex communication system by using a nonlinear interference cancellation capability in a wireless communication system.

[0025] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects that result from implementing the configuration described in the present disclosure can also be derived by those skilled in the art from the embodiments of the present disclosure.

[0026] The accompanying drawings are intended to aid in understanding the present disclosure and, together with detailed descriptions, may provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. Reference numerals in each drawing may indicate structural elements.

[0027] FIG. 1 is a diagram illustrating an example of a communication system applicable to the present disclosure.

[0028] FIG. 2 is a drawing showing an example of a wireless device applicable to the present disclosure.

[0029] FIG. 3 is a diagram showing another example of a wireless device applicable to the present disclosure.

[0030] FIG. 4 is a drawing showing an example of a mobile device applicable to the present disclosure.

[0031] FIG. 5 is a drawing showing an example of a vehicle or autonomous vehicle applicable to the present disclosure.

[0032] Figure 6 is a diagram showing an example of AI (Artificial Intelligence) applicable to the present disclosure.

[0033] FIG. 7 is a diagram illustrating a method for processing a transmission signal applicable to the present disclosure.

[0034] FIG. 8 is a diagram showing an example of a communication structure that can be provided in a 6G system applicable to the present disclosure.

[0035] Figure 9 is a diagram showing an electromagnetic spectrum applicable to the present disclosure.

[0036] Fig. 10 is a diagram showing a THz communication method applicable to the present disclosure.

[0037] FIG. 11 is a conceptual diagram illustrating a terminal and a base station supporting FDR according to one embodiment of the present disclosure.

[0038] FIG. 12 is a diagram illustrating an example of a transmission / reception link and self-interference in an FDR communication situation according to one embodiment of the present disclosure.

[0039] FIG. 13 is a diagram showing locations where three interference techniques are applied in a radio frequency (RF) front end according to one embodiment of the present disclosure.

[0040] FIG. 14 is a diagram showing the structure of a transmitter and receiver for magnetic interference cancellation in a communication device according to one embodiment of the present disclosure.

[0041] FIG. 15 is a diagram illustrating an example of an expanded radius supporting a full-duplex transmission mode according to nonlinear magnetic interference cancellation according to an embodiment of the present disclosure.

[0042] FIG. 16 is a diagram illustrating a non-linear interference canceller according to one embodiment of the present disclosure.

[0043] FIG. 17 is a diagram illustrating signaling for a base station to receive information regarding self-interference cancellation of a terminal according to an embodiment of the present disclosure.

[0044] FIG. 18 is a flowchart illustrating a process in which a terminal and a base station operate in a full-duplex or half-duplex transmission mode based on a dual communication support capability level and a nonlinear self-interference cancellation capability according to an embodiment of the present disclosure.

[0045] FIG. 19 is a diagram illustrating a procedure for a terminal to perform full-duplex communication based on a dual communication support capability according to one embodiment of the present disclosure.

[0046] FIG. 20 is a diagram illustrating a procedure for monitoring magnetic interference and changing a transmission mode according to an embodiment of the present disclosure.

[0047] FIG. 21 is a diagram illustrating a procedure in which a base station performs full-duplex communication based on a dual communication support capability according to one embodiment of the present disclosure.

[0048] The following embodiments combine components and features of the present disclosure in a predetermined form. Each component or feature may be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, some components and / or features may be combined to form embodiments of the present disclosure. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

[0049] In the description of the drawings, procedures or steps that may obscure the gist of the present disclosure are not described, and procedures or steps that can be understood by a person skilled in the art are also not described.

[0050] Throughout the specification, when a part is said to "comprising" or "including" a component, this does not mean that other components may be included, but rather that other components may be excluded, unless otherwise specifically stated. In addition, terms such as "...part," "...unit," and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software. In addition, the words "a" or "an," "one," "the," and similar related words may be used in the context of describing the present disclosure (especially in the context of the claims below) to include both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context.

[0051] Embodiments of the present disclosure described herein focus on the data transmission and reception relationship between a base station and a mobile station. Here, the base station is understood as a terminal node of a network that directly communicates with the mobile station. Certain operations described herein as being performed by the base station may, in some cases, be performed by an upper node of the base station.

[0052] That is, in a network consisting of multiple network nodes including a base station, various operations performed for communication with a mobile station may be performed by the base station or other network nodes other than the base station. In this case, the term 'base station' may be replaced by terms such as fixed station, Node B, eNB (eNode B), gNB (gNode B), ng-eNB, advanced base station (ABS), or access point.

[0053] Additionally, in embodiments of the present disclosure, the term terminal may be replaced with terms such as user equipment (UE), mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, or advanced mobile station (AMS).

[0054] Additionally, a transmitter refers to a fixed and / or mobile node that provides data or voice services, and a receiver refers to a fixed and / or mobile node that receives data or voice services. Therefore, for uplink, a mobile station can be the transmitter, and a base station can be the receiver. Similarly, for downlink, a mobile station can be the receiver, and a base station can be the transmitter.

[0055] Embodiments of the present disclosure may be supported by standard documents disclosed in at least one of wireless access systems, such as IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP Long Term Evolution (LTE) system, 3GPP 5G (5th generation) NR (New Radio) system and 3GPP2 system, and in particular, embodiments of the present disclosure may be supported by 3GPP TS (technical specification) 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331 documents.

[0056] Furthermore, the embodiments of the present disclosure may be applied to other wireless access systems and are not limited to the aforementioned systems. For example, they may be applicable to systems implemented after the 3GPP 5G NR system and are not limited to a specific system.

[0057] That is, obvious steps or parts not described in the embodiments of the present disclosure can be explained by referring to the above documents. In addition, all terms disclosed in this document can be explained by the above standard documents.

[0058] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the present disclosure and is not intended to represent the only embodiments in which the technical configurations of the present disclosure may be implemented.

[0059] Additionally, specific terms used in the embodiments of the present disclosure are provided to aid in understanding the present disclosure, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present disclosure.

[0060] The following technology can be applied to various wireless access systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access).

[0061] In order to make the following description clear, the following description is based on a 3GPP communication system (e.g., LTE, NR, etc.), but the technical idea of ​​the present invention is not limited thereto. LTE may refer to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 may be referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 may be referred to as LTE-A pro. 3GPP NR may refer to technology after TS 38.xxx Release 15. 3GPP 6G may refer to technology after TS Release 17 and / or Release 18. "xxx" refers to a standard document detail number. LTE / NR / 6G may be collectively referred to as a 3GPP system.

[0062] For background information, terms, abbreviations, etc. used in this disclosure, reference may be made to standard documents published prior to the invention of the present invention. For example, reference may be made to the 36.xxx and 38.xxx standard documents.

[0063] Communication system applicable to the present disclosure

[0064] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present disclosure disclosed in this document may be applied to various fields requiring wireless communication / connectivity (e.g., 5G) between devices.

[0065] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0066] FIG. 1 is a diagram illustrating an example of a communication system applied to the present disclosure.

[0067] Referring to FIG. 1, a communication system (100) applied to the present disclosure includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR, LTE) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (extended reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI (artificial intelligence) device / server (100g). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicles (100b-1, 100b-2) may include unmanned aerial vehicles (UAVs) (e.g., drones). The XR devices (100c) include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. The portable devices (100d) may include smartphones, smart pads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., laptops, etc.), etc. The home appliances (100e) may include TVs, refrigerators, washing machines, etc. The IoT devices (100f) may include sensors, smart meters, etc. For example, the base station (120) and the network (130) may also be implemented as wireless devices, and a specific wireless device (120a) may act as a base station / network node to other wireless devices.

[0068] Wireless devices (100a to 100f) can be connected to a network (130) via a base station (120). AI technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (100g) via a network (130). The network (130) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (120) / network (130), but can also communicate directly (e.g., sidelink communication) without going through the base station (120) / network (130). For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (vehicle to vehicle) / V2X (vehicle to everything) communication). In addition, IoT devices (100f) (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0069] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a to 100f) / base stations (120), and base stations (120) / base stations (120). Here, the wireless communication / connection can be established through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and base station-to-base station communication (150c) (e.g., relay, IAB (integrated access backhaul)). Through the wireless communication / connection (150a, 150b, 150c), the wireless device and base station / wireless device, and base stations and base stations can transmit / receive wireless signals to / from each other. For example, the wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0070] Communication system applicable to the present disclosure

[0071] FIG. 2 is a diagram illustrating an example of a wireless device applicable to the present disclosure.

[0072] Referring to FIG. 2, the first wireless device (200a) and the second wireless device (200b) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (200a), the second wireless device (200b)} can correspond to {the wireless device (100x), the base station (120)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 1.

[0073] A first wireless device (200a) includes one or more processors (202a) and one or more memories (204a), and may further include one or more transceivers (206a) and / or one or more antennas (208a). The processor (202a) controls the memories (204a) and / or the transceivers (206a), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202a) may process information in the memory (204a) to generate first information / signals, and then transmit a wireless signal including the first information / signals via the transceivers (206a). In addition, the processor (202a) may receive a wireless signal including second information / signals via the transceivers (206a), and then store information obtained from signal processing of the second information / signals in the memory (204a). The memory (204a) may be connected to the processor (202a) and may store various information related to the operation of the processor (202a). For example, the memory (204a) may perform some or all of the processes controlled by the processor (202a), or may store software code including instructions for performing the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. Here, the processor (202a) and the memory (204a) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206a) may be connected to the processor (202a) and may transmit and / or receive wireless signals via one or more antennas (208a). The transceiver (206a) may include a transmitter and / or a receiver. The transceiver (206a) may be used interchangeably with an RF (radio frequency) unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0074] The second wireless device (200b) includes one or more processors (202b), one or more memories (204b), and may further include one or more transceivers (206b) and / or one or more antennas (208b). The processor (202b) controls the memories (204b) and / or the transceivers (206b), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202b) may process information in the memory (204b) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206b). In addition, the processor (202b) may receive a wireless signal including fourth information / signals via the transceivers (206b), and then store information obtained from the signal processing of the fourth information / signals in the memory (204b). The memory (204b) may be connected to the processor (202b) and may store various information related to the operation of the processor (202b). For example, the memory (204b) may perform some or all of the processes controlled by the processor (202b), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. Here, the processor (202b) and the memory (204b) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206b) may be connected to the processor (202b) and may transmit and / or receive wireless signals via one or more antennas (208b). The transceiver (206b) may include a transmitter and / or a receiver. The transceiver (206b) may be used interchangeably with an RF unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0075] Hereinafter, the hardware elements of the wireless device (200a, 200b) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (202a, 202b). For example, one or more processors (202a, 202b) may implement one or more layers (e.g., functional layers such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), radio resource control (RRC), and service data adaptation protocol (SDAP)). One or more processors (202a, 202b) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors (202a, 202b) may generate messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein. One or more processors (202a, 202b) may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (206a, 206b). One or more processors (202a, 202b) may receive signals (e.g., baseband signals) from one or more transceivers (206a, 206b) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0076] One or more processors (202a, 202b) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (202a, 202b) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors (202a, 202b). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (202a, 202b) or stored in one or more memories (204a, 204b) and executed by one or more processors (202a, 202b). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0077] One or more memories (204a, 204b) may be coupled to one or more processors (202a, 202b) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (204a, 204b) may be configured as read only memory (ROM), random access memory (RAM), erasable programmable read only memory (EPROM), flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories (204a, 204b) may be located internally and / or externally to the one or more processors (202a, 202b). Additionally, the one or more memories (204a, 204b) may be coupled to the one or more processors (202a, 202b) via various technologies, such as wired or wireless connections.

[0078] One or more transceivers (206a, 206b) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (206a, 206b) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (206a, 206b) can be coupled to one or more processors (202a, 202b) and can transmit and receive wireless signals. For example, one or more processors (202a, 202b) can control one or more transceivers (206a, 206b) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (202a, 202b) may control one or more transceivers (206a, 206b) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (206a, 206b) may be coupled to one or more antennas (208a, 208b), and one or more transceivers (206a, 206b) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, via one or more antennas (208a, 208b). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (206a, 206b) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (202a, 202b).One or more transceivers (206a, 206b) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (202a, 202b) from baseband signals to RF band signals. For this purpose, one or more transceivers (206a, 206b) may include an (analog) oscillator and / or filter.

[0079] Wireless device structure applicable to the present disclosure

[0080] FIG. 3 is a diagram illustrating another example of a wireless device applicable to the present disclosure.

[0081] Referring to FIG. 3, the wireless device (300) corresponds to the wireless devices (200a, 200b) of FIG. 2 and may be composed of various elements, components, units, and / or modules. For example, the wireless device (300) may include a communication unit (310), a control unit (320), a memory unit (330), and additional elements (340). The communication unit may include a communication circuit (312) and a transceiver(s) (314). For example, the communication circuit (312) may include one or more processors (202a, 202b) and / or one or more memories (204a, 204b) of FIG. 2. For example, the transceiver(s) (314) may include one or more transceivers (206a, 206b) and / or one or more antennas (208a, 208b) of FIG. 2. The control unit (320) is electrically connected to the communication unit (310), the memory unit (330), and the additional elements (340) and controls the overall operation of the wireless device. For example, the control unit (320) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (330). In addition, the control unit (320) may transmit information stored in the memory unit (330) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (310), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (330).

[0082] The additional element (340) may be configured in various ways depending on the type of the wireless device. For example, the additional element (340) may include at least one of a power unit / battery, an input / output unit, a driving unit, and a computing unit. Although not limited thereto, the wireless device (300) may be implemented in the form of a robot (Fig. 1, 100a), a vehicle (Fig. 1, 100b-1, 100b-2), an XR device (Fig. 1, 100c), a portable device (Fig. 1, 100d), a home appliance (Fig. 1, 100e), an IoT device (Fig. 1, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 1, 140), a base station (Fig. 1, 120), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0083] In FIG. 3, various elements, components, units / parts, and / or modules within the wireless device (300) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (310). For example, within the wireless device (300), the control unit (320) and the communication unit (310) may be wired, and the control unit (320) and the first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (310). In addition, each element, component, unit / part, and / or module within the wireless device (300) may further include one or more elements. For example, the control unit (320) may be composed of a set of one or more processors. For example, the control unit (320) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (330) may be composed of RAM, DRAM (dynamic RAM), ROM, flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0084] Mobile devices to which the present disclosure applies

[0085] FIG. 4 is a drawing illustrating an example of a mobile device applied to the present disclosure.

[0086] Figure 4 illustrates an example of a mobile device applicable to the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a portable computer (e.g., a laptop, etc.). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0087] Referring to FIG. 4, the portable device (400) may include an antenna unit (408), a communication unit (410), a control unit (420), a memory unit (430), a power supply unit (440a), an interface unit (440b), and an input / output unit (440c). The antenna unit (408) may be configured as a part of the communication unit (410). Blocks 410 to 430 / 440a to 440c correspond to blocks 310 to 330 / 340 of FIG. 3, respectively.

[0088] The communication unit (410) can transmit and receive signals (e.g., data, control signals, etc.) with other wireless devices and base stations. The control unit (420) can control components of the portable device (400) to perform various operations. The control unit (420) can include an AP (application processor). The memory unit (430) can store data / parameters / programs / codes / commands required for operating the portable device (400). In addition, the memory unit (430) can store input / output data / information, etc. The power supply unit (440a) supplies power to the portable device (400) and can include a wired / wireless charging circuit, a battery, etc. The interface unit (440b) can support connection between the portable device (400) and other external devices. The interface unit (440b) can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit (440c) can input or output video information / signals, audio information / signals, data, and / or information input from a user. The input / output unit (440c) may include a camera, a microphone, a user input unit, a display unit (440d), a speaker, and / or a haptic module.

[0089] For example, in the case of data communication, the input / output unit (440c) obtains information / signals (e.g., touch, text, voice, image, video) input by the user, and the obtained information / signals can be stored in the memory unit (430). The communication unit (410) can convert the information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station. In addition, the communication unit (410) can receive wireless signals from other wireless devices or base stations, and then restore the received wireless signals to the original information / signals. The restored information / signals can be stored in the memory unit (430) and then output in various forms (e.g., text, voice, image, video, haptic) through the input / output unit (440c).

[0090] Types of wireless devices to which the present disclosure applies

[0091] FIG. 5 is a drawing illustrating an example of a vehicle or autonomous vehicle to which the present disclosure applies.

[0092] Figure 5 illustrates a vehicle or autonomous vehicle applicable to the present disclosure. The vehicle or autonomous vehicle may be implemented as a mobile robot, car, train, manned / unmanned aerial vehicle (AV), ship, etc., and is not limited to the form of a vehicle.

[0093] Referring to FIG. 5, a vehicle or autonomous vehicle (500) may include an antenna unit (508), a communication unit (510), a control unit (520), a driving unit (540a), a power supply unit (540b), a sensor unit (540c), and an autonomous driving unit (540d). The antenna unit (550) may be configured as a part of the communication unit (510). Blocks 510 / 530 / 540a to 540d correspond to blocks 410 / 430 / 440 of FIG. 4, respectively.

[0094] The communication unit (510) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, roadside base stations, etc.), servers, etc. The control unit (520) can control elements of a vehicle or autonomous vehicle (500) to perform various operations. The control unit (520) can include an electronic control unit (ECU).

[0095] Figure 6 is a diagram illustrating an example of an AI device applicable to the present disclosure. For example, the AI ​​device may be implemented as a fixed or mobile device, such as a TV, projector, smartphone, PC, laptop, digital broadcasting terminal, tablet PC, wearable device, set-top box (STB), radio, washing machine, refrigerator, digital signage, robot, or vehicle.

[0096] Referring to FIG. 6, the AI ​​device (600) may include a communication unit (610), a control unit (620), a memory unit (630), an input / output unit (640a / 640b), a learning processor unit (640c), and a sensor unit (640d). Blocks 610 to 630 / 640a to 640d may correspond to blocks 310 to 330 / 340 of FIG. 3, respectively.

[0097] The communication unit (610) can transmit and receive wired and wireless signals (e.g., sensor information, user input, learning models, control signals, etc.) with external devices such as other AI devices (e.g., FIG. 1, 100x, 120, 140) or AI servers (FIG. 1, 140) using wired and wireless communication technology. To this end, the communication unit (610) can transmit information within the memory unit (630) to the external device or transfer a signal received from the external device to the memory unit (630).

[0098] The control unit (620) may determine at least one executable operation of the AI ​​device (600) based on information determined or generated using a data analysis algorithm or a machine learning algorithm. In addition, the control unit (620) may control components of the AI ​​device (600) to perform the determined operation. For example, the control unit (620) may request, search, receive, or utilize data from the learning processor unit (640c) or the memory unit (630), and may control components of the AI ​​device (600) to perform a predicted operation or an operation determined to be desirable among at least one executable operation. In addition, the control unit (620) may collect history information including the operation contents of the AI ​​device (600) or user feedback on the operation, and store the collected history information in the memory unit (630) or the learning processor unit (640c), or transmit the collected history information to an external device such as an AI server (FIG. 1, 140). The collected history information may be used to update a learning model.

[0099] The memory unit (630) can store data that supports various functions of the AI ​​device (600). For example, the memory unit (630) can store data obtained from the input unit (640a), data obtained from the communication unit (610), output data of the learning processor unit (640c), and data obtained from the sensing unit (640). In addition, the memory unit (630) can store control information and / or software codes necessary for the operation / execution of the control unit (620).

[0100] The input unit (640a) can obtain various types of data from the outside of the AI ​​device (600). For example, the input unit (620) can obtain learning data for model learning, input data to which the learning model will be applied, etc. The input unit (640a) may include a camera, a microphone, and / or a user input unit. The output unit (640b) may generate output related to vision, hearing, or touch. The output unit (640b) may include a display unit, a speaker, and / or a haptic module, etc. The sensing unit (640) can obtain at least one of internal information of the AI ​​device (600), information about the surrounding environment of the AI ​​device (600), and user information using various sensors. The sensing unit (640) may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and / or a radar, etc.

[0101] The learning processor unit (640c) can train a model composed of an artificial neural network using learning data. The learning processor unit (640c) can perform AI processing together with the learning processor unit of the AI ​​server (Fig. 1, 140). The learning processor unit (640c) can process information received from an external device via the communication unit (610) and / or information stored in the memory unit (630). In addition, the output value of the learning processor unit (640c) can be transmitted to an external device via the communication unit (610) and / or stored in the memory unit (630).

[0102] FIG. 7 is a diagram illustrating a method for processing a transmission signal applied to the present disclosure. For example, the transmission signal may be processed by a signal processing circuit. At this time, the signal processing circuit (700) may include a scrambler (710), a modulator (720), a layer mapper (730), a precoder (740), a resource mapper (750), and a signal generator (760). At this time, as an example, the operations / functions of FIG. 7 may be performed in the processors (202a, 202b) and / or the transceivers (206a, 206b) of FIG. 2. Furthermore, as an example, the hardware elements of FIG. 7 may be implemented in the processors (202a, 202b) and / or the transceivers (206a, 206b) of FIG. 2. As an example, blocks 710 to 760 may be implemented in the processors (202a, 202b) of FIG. 2. Additionally, blocks 710 to 750 may be implemented in the processor (202a, 202b) of FIG. 2, and block 760 may be implemented in the transceiver (206a, 206b) of FIG. 2, and are not limited to the above-described embodiments.

[0103] The codeword can be converted into a wireless signal through the signal processing circuit (700) of FIG. 7. Here, the codeword is an encoded bit sequence of an information block. The information block may include a transport block (e.g., a UL-SCH transport block, a DL-SCH transport block). The wireless signal may be transmitted through various physical channels (e.g., a PUSCH, a PDSCH). Specifically, the codeword can be converted into a bit sequence scrambled by a scrambler (710). The scramble sequence used for scrambling is generated based on an initialization value, and the initialization value may include ID information of the wireless device, etc. The scrambled bit sequence can be modulated into a modulation symbol sequence by a modulator (720). The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), m-quadrature amplitude modulation (m-QAM), etc.

[0104] A complex modulation symbol sequence can be mapped to one or more transmission layers by a layer mapper (730). The modulation symbols of each transmission layer can be mapped to the corresponding antenna port(s) by a precoder (740) (precoding). The output z of the precoder (740) can be obtained by multiplying the output y of the layer mapper (730) by an N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder (740) can perform precoding after performing transform precoding (e.g., discrete Fourier transform (DFT) transform) on the complex modulation symbols. In addition, the precoder (740) can perform precoding without performing transform precoding.

[0105] The resource mapper (750) can map modulation symbols of each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator (760) generates a wireless signal from the mapped modulation symbols, and the generated wireless signal can be transmitted to another device through each antenna. To this end, the signal generator (760) can include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

[0106] The signal processing process for receiving signals in a wireless device can be configured in reverse order of the signal processing process (710 to 760) of FIG. 7. For example, a wireless device (e.g., 200a and 200b of FIG. 2) can receive wireless signals from the outside through an antenna port / transceiver. The received wireless signals can be converted into baseband signals through a signal restorer. For this purpose, the signal restorer can include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Thereafter, the baseband signal can be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codewords can be restored to the original information blocks through decoding. Accordingly, a signal processing circuit (not shown) for a received signal may include a signal restorer, a resource de-mapper, a postcoder, a demodulator, a de-scrambler, and a decoder.

[0107] 6G communication system

[0108] The 6G (wireless communication) system aims to achieve (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) low energy consumption for battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be divided into four aspects: "intelligent connectivity," "deep connectivity," "holographic connectivity," and "ubiquitous connectivity," and the 6G system can satisfy the requirements as shown in Table 1 below. In other words, Table 1 is a table showing the requirements of the 6G system.

[0109] Per device peak data rate1 TbpsE2E latency1 msMaximum spectral efficiency100 bps / HzMobility supportup to 1000 km / hrSatellite integrationFullyAIFullyAutonomous vehicleFullyXRFullyHaptic CommunicationFully

[0110] At this time, the 6G system may have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine type communications (mMTC), AI integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0111] FIG. 8 is a diagram illustrating an example of a communication structure that can be provided in a 6G system applicable to the present disclosure.

[0112] Referring to Figure 8, 6G systems are expected to have 50 times higher simultaneous wireless connectivity than 5G wireless systems. URLLC, a key feature of 5G, is expected to become a more prominent technology in 6G communications, providing end-to-end latency of less than 1 ms. Furthermore, 6G systems will have significantly better volumetric spectral efficiency, unlike the commonly used area spectral efficiency. 6G systems can offer extremely long battery life and advanced battery technologies for energy harvesting, eliminating the need for separate charging for mobile devices in 6G systems.

[0113] Core implementation technology of 6G systems

[0114] - Artificial Intelligence (AI)

[0115] The most crucial and newly introduced technology for 6G systems is AI. 4G systems did not involve AI. 5G systems will support partial or very limited AI. However, 6G systems will fully support AI for automation. Advances in machine learning will create more intelligent networks for real-time communications in 6G. Incorporating AI into communications can streamline and improve real-time data transmission. AI can use numerous analyses to determine how complex target tasks should be performed. In other words, AI can increase efficiency and reduce processing delays.

[0116] Time-consuming tasks such as handover, network selection, and resource scheduling can be performed instantly using AI. AI can also play a crucial role in machine-to-machine (M2M), machine-to-human, and human-to-machine communications. Furthermore, AI can facilitate rapid communication in brain-computer interfaces (BCIs). AI-based communication systems can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-sustaining wireless networks, and machine learning.

[0117] Recent attempts to integrate AI into wireless communication systems have focused on the application layer and network layer, particularly deep learning in wireless resource management and allocation. However, this research is increasingly evolving to the MAC layer and physical layer, with attempts to combine deep learning with wireless transmission, particularly in the physical layer. AI-based physical layer transmission refers to applying AI-based signal processing and communication mechanisms, rather than traditional communication frameworks, in the fundamental signal processing and communication mechanisms. For example, this may include deep learning-based channel coding and decoding, deep learning-based signal estimation and detection, deep learning-based multiple input multiple output (MIMO) mechanisms, and AI-based resource scheduling and allocation.

[0118] Machine learning can be used for channel estimation and channel tracking, as well as for power allocation and interference cancellation at the physical layer of the downlink (DL). Machine learning can also be used for antenna selection, power control, and symbol detection in MIMO systems.

[0119] However, the application of DNN for transmission at the physical layer may have the following problems.

[0120] Deep learning-based AI algorithms require a large amount of training data to optimize training parameters. However, due to limitations in obtaining training data from specific channel environments, a large amount of training data is used offline. This means that static training on training data in specific channel environments can lead to conflicts with the dynamic characteristics and diversity of the wireless channel.

[0121] Furthermore, current deep learning primarily targets real-world signals. However, signals at the physical layer of wireless communications are complex signals. Further research is needed on neural networks capable of detecting complex domain signals to match the characteristics of wireless communication signals.

[0122] Below, we will look at machine learning in more detail.

[0123] Machine learning refers to a series of operations that train machines to perform tasks that humans can or cannot perform. Machine learning requires data and a learning model. In machine learning, data learning methods can be broadly categorized into three types: supervised learning, unsupervised learning, and reinforcement learning.

[0124] Neural network training aims to minimize output errors. It involves repeatedly inputting training data into a neural network, calculating the neural network output and target error for the training data, and backpropagating the neural network error from the output layer to the input layer to update the weights of each node in the neural network to reduce the error.

[0125] Supervised learning uses labeled training data, while unsupervised learning may not have labeled training data. For example, in the case of supervised learning for data classification, the training data may be data in which each training data category is labeled. The labeled training data is input to a neural network, and the error can be calculated by comparing the output (categories) of the neural network with the training data labels. The calculated error is backpropagated through the neural network in the backward direction (i.e., from the output layer to the input layer), and the connection weights of each node in each layer of the neural network can be updated through backpropagation. The amount of change in the connection weights of each updated node can be determined by the learning rate. The neural network's calculation of the input data and the backpropagation of the error can constitute a learning cycle (epoch). The learning rate can be applied differently depending on the number of iterations of the neural network's learning cycle. For example, in the early stages of training a neural network, a high learning rate can be used to quickly allow the network to achieve a certain level of performance, thereby increasing efficiency. In the later stages of training, a low learning rate can be used to increase accuracy.

[0126] Learning methods may vary depending on the characteristics of the data. For example, if the goal is to accurately predict data transmitted by a transmitter in a communication system, supervised learning is preferable to unsupervised learning or reinforcement learning.

[0127] The learning model corresponds to the human brain, and the most basic linear model can be thought of, but the machine learning paradigm that uses highly complex neural network structures, such as artificial neural networks, as learning models is called deep learning.

[0128] The neural network cores used in learning methods are mainly deep neural networks (DNN), convolutional deep neural networks (CNN), and recurrent Boltzmann machines (RNN), and these learning models can be applied.

[0129] THz (Terahertz) communication

[0130] THz communications can be applied in 6G systems. For example, data transmission rates can be increased by increasing bandwidth. This can be achieved by using sub-THz communications with wide bandwidths and applying advanced massive MIMO technology.

[0131] FIG. 9 is a diagram illustrating an electromagnetic spectrum applicable to the present disclosure. For example, referring to FIG. 9, THz waves, also known as sub-millimeter radiation, typically represent a frequency band between 0.1 THz and 10 THz with a corresponding wavelength ranging from 0.03 mm to 3 mm. The 100 GHz to 300 GHz band (Sub-THz band) is considered a major portion of the THz band for cellular communications. Adding the Sub-THz band to the mmWave band will increase the capacity of 6G cellular communications. Among the defined THz bands, 300 GHz to 3 THz is in the far infrared (IR) frequency band. Although the 300 GHz to 3 THz band is part of the optical band, it is at the boundary of the optical band and lies just behind the RF band. Therefore, this 300 GHz to 3 THz band exhibits similarities to RF.

[0132] Key characteristics of THz communications include (i) the widely available bandwidth to support very high data rates and (ii) the high path loss that occurs at high frequencies (requiring highly directional antennas). The narrow beamwidths generated by highly directional antennas reduce interference. The small wavelength of THz signals allows for a significantly larger number of antenna elements to be integrated into devices and base stations operating in this band. This enables the use of advanced adaptive array technologies to overcome range limitations.

[0133] Terahertz (THz) wireless communications

[0134] FIG. 10 is a diagram illustrating a THz communication method applicable to the present disclosure.

[0135] Referring to Fig. 10, THz wireless communication is a wireless communication using THz waves with a frequency of approximately 0.1 to 10 THz (1 THz = 1012 Hz), and may refer to terahertz (THz) band wireless communication using a very high carrier frequency of 100 GHz or higher. THz waves are located between the RF (Radio Frequency) / millimeter (mm) and infrared bands, and (i) compared to visible light / infrared rays, they penetrate non-metallic / non-polarizable materials well, and compared to RF / millimeter waves, they have a shorter wavelength, so they have high straightness and can enable beam focusing.

[0136] In communication systems, transmission modes can be divided into full-duplex radio (FDR) mode and half-duplex radio (HDR) mode. By using the same frequency band for downlink and uplink channels, FDR systems can increase spectral efficiency by up to two times compared to existing HDR systems. This has led to their emergence as a key technology for next-generation mobile communication systems.

[0137] From the perspective of any wireless device, FDR technology using a single frequency transmission band can be defined as a transmission resource configuration method that simultaneously performs transmission and reception through a single frequency transmission band. As a specific example, FDR technology can be expressed as a transmission resource configuration method that simultaneously performs downlink transmission and uplink reception of a base station, and downlink reception and uplink transmission of a wireless terminal through a single frequency transmission band for wireless communication between a general access node (e.g., a base station, a repeater, a relay node, a remote radio head (RRH), etc.) and a wireless terminal. As another example, FDR technology can be expressed as a transmission resource configuration method that simultaneously performs transmission and reception between wireless terminals in the same frequency transmission band in a device-to-device direct communication (D2D) situation between wireless terminals.

[0138] Hereinafter, the present disclosure describes proposed technologies related to FDR by taking as an example the case of wireless transmission and reception between a general base station and a wireless terminal, but the various proposed embodiments can also be applied to a network wireless device that performs wireless transmission and reception with a terminal other than a general base station, and further can be applied to a case of direct communication between terminals.

[0139] Overview of the FDR system and interference factors in FDR

[0140] First, we describe an overview of the FDR system and the interference elements within it. Figure 11 is a conceptual diagram illustrating a terminal and base station supporting FDR according to an embodiment of the present disclosure. In an FDR situation like that shown in Figure 11, the following three types of interference may exist.

[0141] Intra-device self-interference: Since transmission and reception occur within the same time and frequency resources, both the desired signal and the self-transmitted signal are received simultaneously. This means that the self-transmitted signal is received by the receiving antenna with minimal attenuation, resulting in interference with the desired signal, as it is received with significantly greater power than the desired signal.

[0142] UE to UE inter-link interference: This refers to the situation where an uplink signal transmitted by a terminal is received by an adjacent terminal and acts as interference.

[0143] BS to BS inter-link interference: This refers to the interference that occurs when a signal transmitted between base stations or between different base stations (picocell, femtocell, relay node) in a HetNet situation is received by the receiving antenna of another base station.

[0144] Among the three types of interference mentioned above, intra-device self-interference (SI) occurs only in FDR systems. SI significantly degrades the performance of FDR systems and is considered the most critical issue to address before operating them.

[0145] FIG. 12 is a diagram illustrating an example of a transmission / reception link and self-interference in an FDR communication situation according to one embodiment of the present disclosure.

[0146] As shown in Figure 12, SI can be divided into direct interference, where the signal transmitted from the transmitting antenna directly enters the receiving antenna without any path attenuation, and reflected interference, where the signal is reflected by the surrounding terrain. The magnitude of direct and reflected interference is typically greater than that of the intended signal due to the difference in physical distance. Due to this large interference strength, effective SI cancellation is essential for the operation of the FDR system.

[0147] In order for the FDR system to operate effectively, the requirements for self-interference cancellation (self-IC) according to the maximum transmission power can be determined as shown in [Table 2] below.

[0148] Node TypeMax. Tx Power (P A )Thermal Noise(BW=20MHz)Receiver NFReceiver Thermal Noise LevelSelf-IC Target(P A - TN-NF) Macro eNB46dBm-101dBm5dB(for eNB)-96dBm142 dBPico eNB30dBm126 dBFemto eNB,WLAN AP23dBm119 dBUE23dBm9dB(for UE)-92dBm115 dB

[0149] Depending on the bandwidth of the mobile communication system, the thermal noise value can be determined by, and [Table 2] shows an example of thermal noise assuming a bandwidth of 20 MHz. The receiver NF (receiver noise figure) is an example that considers the worst case of the 3GPP standard requirements. The receiver thermal noise level is determined by the sum of the thermal noise and the receiver NF at a specific BW.

[0150] Referring to [Table 2], we can see that a terminal requires a self-interference cancellation performance of 119 dBm to effectively operate an FDR system over a 20 MHz bandwidth. To achieve this performance, three stages of self-interference cancellation techniques exist, detailed below.

[0151] Antenna self-interference cancellation (antenna self-IC): This is the most important of all self-interference cancellation techniques, and SI cancellation is performed at the antenna level. In the simplest case, some SI signals can be removed by physically blocking the transmission of the SI signal by installing a signal-blocking object between the transmitting and receiving antennas. Alternatively, some SI signals can be removed by artificially adjusting the distance between the antennas using multiple antennas or by inverting the phase of a specific transmission signal. Furthermore, some SI signals can be removed by utilizing multi-polarized or directional antennas.

[0152] Analog self-interference cancellation (AIC): A technique for removing interference at the analog stage before the received signal passes through the analog-to-digital converter (ADC). This technique uses a replicated analog signal to remove SI signals. This can be performed in the RF or IF domain.

[0153] The SI signal removal method is described specifically as follows. First, the transmitted analog signal is time-delayed, then the amplitude and phase are adjusted to create a replica of the SI signal actually received, which is then subtracted from the signal received by the receiving antenna. However, because it processes using analog signals, additional distortion may occur due to implementation complexity and circuit characteristics, which can significantly affect interference removal performance.

[0154] Digital self-interference cancellation (DIC): This technique eliminates interference after the received signal passes through the ADC. It encompasses all interference cancellation techniques implemented in the baseband domain. The simplest implementation involves using the transmitted digital signal to create a replica signal of SI and subtracting it from the received digital signal. Alternatively, techniques that utilize multiple antennas to perform precoding / postcoding at the baseband to prevent the transmitted signal to the terminal or base station from being received by the receiving antenna can also be classified as digital self-interference cancellation.

[0155] However, since digital self-interference cancellation is possible only when the digitally modulated signal is quantized to a degree that information about the desired signal can be restored, a prerequisite for performing digital self-interference cancellation is that the difference in signal power between the remaining interference signal after removing interference using one or more of the above techniques and the desired signal must fall within the ADC range.

[0156] The application locations of the three self-interference cancellation techniques described above are as shown in FIG. 13 below. FIG. 13 is a diagram showing the application locations of the three interference techniques in an RF (radio frequency) front end according to an embodiment of the present disclosure. Referring to FIG. 13, antenna cancellation, which performs antenna self-interference cancellation, is applied in the antenna section, analog cancellation, which performs analog self-interference cancellation, is applied in the section including the mixer that converts a baseband signal into an RF signal, and digital cancellation, which performs digital self-interference cancellation, is applied in the section before the input of a DAC (digital to analog converter) and after the output of an ADC (analog to digital converter).

[0157] FIG. 14 is a diagram illustrating the structure of a transceiver for canceling self-interference in a communication device according to an embodiment of the present disclosure. In FIG. 14, a digital cancellation block that performs digital self-interference cancellation is illustrated as performing interference cancellation using a digital self-interference signal (digital SI) before the DAC and after the ADC. However, according to another example, digital self-interference cancellation may be performed using the digital SI after the IFFT and before the FFT. Furthermore, although FIG. 14 illustrates a structure that cancels self-interference signals by separating the transmit antenna and the receive antenna, according to another example, an antenna interference cancellation technique using a single antenna may be used. In this case, the antenna structure may be different from the example of FIG. 14. To this end, additional functional blocks suitable for the purpose may be added or deleted.

[0158] Signal modeling of the FDR system

[0159] Because the FDR system uses the same frequency for both the transmit and receive signals, it is significantly affected by non-linear components in the RF. In particular, the transmit signal is distorted by the non-linear characteristics of active components such as the power amplifier (PA) in the transmit RF chain and the low noise amplifier (LNA) in the receive RF chain, and distortion can also occur due to the mixer in the transmit and receive RF chains. Due to this distortion, the transmit signal can be modeled as generating high-order components. Among these, even-order components occur in the high-frequency region around the direct current (DC) and several times the center frequency, so they can be effectively removed using conventional alternative current (AC) coupling or filtering techniques. However, odd-order components occur adjacent to the existing center frequency, so unlike even-order components, they are not easily removed and have a significant impact on reception. Considering the non-linear characteristics of these odd-order components, the received signal after the ADC in the FDR system can be expressed using the PH (parallel hammerstein) model as shown in [Mathematical Equation 1] below.

[0160]

[0161] In [Equation 1], y(n) is the received signal, h D (n) is the channel through which the desired data passes, x D (n) is the desired data to be received, h SI,k (n) is the self-channel experienced by the transmitted data, x SI (n) represents the transmitted data, and z(n) represents AWGN (additive white Gaussian noise). h SI,k(n) is a linear component when k is 1, and a non-linear component when k is an odd value greater than or equal to 3.

[0162] To utilize this FDR system, terminals and base stations can communicate by selecting either full-duplex or half-duplex transmission mode depending on the channel environment. However, since each terminal may support the FDR system and have different support capabilities for full-duplex transmission mode (e.g., interference cancellation capabilities), the base station may need to individually determine the transmission mode for each terminal to ensure efficient data transmission and reception. Therefore, the base station needs a method that can determine full-duplex or half-duplex transmission mode according to the circumstances of each terminal based on the support capabilities of the terminal and the services used by the terminal. Furthermore, when the transmission mode is changed, a method is needed to switch the communication system to the corresponding transmission mode.

[0163] In the existing patent (Adaptive operational full-duplex and half-duplex FDD modes in wireless networks, US8542617), a TA (timing advance) threshold is used as a measure to be used for FD / half-duplex transmission mode switching. Since the TA value represents the time it takes for an uplink signal to reach the base station, this value can correspond to the distance between the terminal and the base station. Accordingly, the base station can determine that the terminal is located close to the base station if the TA value is small, and that the terminal is located far from the base station if the TA value is large. Based on the TA value, a method is used in which the terminal operates in full-duplex transmission mode when it is close to the base station, and in half-duplex transmission mode when it is far away.

[0164] In this way, existing methods determine the transmission mode solely based on the TA value and the availability of full-duplex transmission mode. Therefore, these methods are not suitable for optimizing communication systems in future environments where terminals with varying full-duplex transmission mode support capabilities will coexist.

[0165] Accordingly, the present disclosure defines the support capability for each terminal transmission mode as a measure of linear and nonlinear magnetic signal rejection capability, and proposes a method for subdividing the linear / nonlinear magnetic interference rejection support capability of each terminal.

[0166] According to the present disclosure, a base station can operate communication more efficiently than existing methods in an environment where terminals supporting full-duplex transmission mode or half-duplex transmission mode are mixed. Furthermore, the base station can manage transmission modes by segmenting the ability to eliminate self-interference between terminals supporting full-duplex transmission mode, thereby expanding the coverage area supporting full-duplex transmission mode compared to existing methods. To this end, the base station needs to know whether each terminal can support full-duplex transmission mode and its ability to respond to nonlinear self-interference, and the details for this are described below.

[0167] FIG. 15 is a diagram illustrating an example of an expanded radius supporting a full-duplex transmission mode according to nonlinear self-interference cancellation according to an embodiment of the present disclosure. In FIG. 15, when a terminal supporting a full-duplex transmission mode receives a signal from a base station, the signal-to-noise ratio (SNR) required is S req The uplink transmission signal power transmitted by the full-duplex transmission mode as shown in Fig. 15 is P U , the downlink transmission signal power received at a specific distance is P D Assume that.

[0168] Referring to Figure 15, we can see the change in power spectrum according to the distance between the terminal and the base station. The first position and the second position refer to the positions when the distance between the terminal and the base station is d1 and d2. In the first position, P U1 The uplink signal power corresponding to P' is determined by self-interference cancellation. U1 Attenuates by . At this time, the channel power (C / N) compared to the noise power of the downlink reception signal is P D1 -P' U1 can be secured. The terminal and base station can use the full-duplex transmission mode if the secured C / N is above the threshold value for signal restoration. Hereinafter, the first position will be described as the limit position where full-duplex transmission mode can be operated by the conventional method of linear self-interference cancellation. At the second position further than the first position, the received downlink transmission signal power is P D2 can be reduced to P, and the uplink signal power is P for transmission over long distances. U2 can be increased. Therefore, the terminal is [(P U2 - P U1 )+(P D1 - P D2 )], transmission and reception can be performed while maintaining the full-duplex transmission mode even in the second location. Therefore, depending on the nonlinear magnetic interference cancellation capability of the terminal, the radius supporting the full-duplex transmission mode can be increased, and communication efficiency can be improved.

[0169] FIG. 16 is a diagram illustrating a non-linear interference canceller according to an embodiment of the present disclosure. A transmission signal x(n) is input to a wireless transceiver (1610) and a pre-computation part (1605). A terminal transmits the signal x(n) through a transmission antenna of the wireless transmitter (1610) and receives a reception signal from another device and a self-interference signal generated by x(n) through a reception antenna. The terminal can remove a high-frequency region portion by passing the signal received through the reception antenna through a low pass filter (LPF) (1603). At this time, as described above, the even-order self-interference component can be effectively removed because it occurs in a high-frequency region corresponding to several times the DC (direct current) periphery and the center frequency. In the pre-computation unit (1605), odd-order signals among the signals of x(n) are calculated, and the terminal applies weights h1 to hp to each of the odd-order signals, adds them all together, and subtracts the result from the signal that has passed through the LPF (1603). The terminal can update the weights h1 to hp of the least mean square (LMS) filter (1607) for optimization.

[0170] Devices that perform nonlinear interference cancellation may need to remove higher-order harmonic components corresponding to nonlinear interference along with linear magnetic interference. As shown in Fig. 16, nonlinear interference cancellers have a more complex structure than devices that only cancel linear magnetic interference, and require a large amount of computation and power consumption. Therefore, a transceiver that supports full-duplex transmission mode can reduce the power consumption of the transceiver by performing communication by distinguishing between cases where only linear magnetic interference cancellation is performed and cases where nonlinear magnetic interference cancellation is also required.

[0171] If a terminal operating in full-duplex mode with linear self-interference cancellation is located at the edge of the full-duplex transmission mode support radius, if nonlinear self-interference cancellation can provide additional gain, self-interference signal distortion due to nonlinear distortion can be overcome, and the radius in which full-duplex transmission mode can be utilized can be expanded. Therefore, the base station can determine the transmission mode based on information about the duplex support ability of each terminal, enabling more efficient operation than operation that simply considers the TA value.

[0172] 3GPP TS38.311 stipulates that the UE capability information field can include operational information for each UE. Therefore, the following information can be added to this field:

[0173] Duplex_Supportability ::= ENUMERATE {Duplex_support_level0, Duplex_support_level1, Duplex_support_level2}

[0174] NonliearSIC_capability ::= {0,5,10,15,20,25,30} or {0,1,2,...,N}

[0175] At this time, the dual communication support capability and nonlinear interference rejection capability can be classified as shown in [Table 3] and [Table 4] below.

[0176] UE categorizationContentsNoteDuplex_support_level0Only Half duplex operation is supported.UE does not have the full duplex capability.Duplex_support_level1Full duplex operation is capable, but the capability is limited to the linear SIC level.UE does not have the ability to cancel the nonlinear self interference.Duplex_support_level2Full duplex operation is capable and extended to the nonlinear SIC level.UE has the ability to cancel the nonlinear self interference.

[0177] Nonlinear SIC Capability LevelContentsNoteNonlinearSIC_capability{0,5,10,15,20,25,30} or {0,1, 2,...,30}Additional nonlinear Capability level(dB)

[0178] Therefore, when establishing an RRC connection, the base station can receive dual communication support capability information and nonlinear interference rejection capability information of each terminal from the terminals through the UE capability information message.

[0179] For example, the duplex communication support capability can be divided into three levels as shown in [Table 3]. Level 0 means a terminal that does not support full-duplex transmission mode, Level 1 means a terminal that supports full-duplex transmission mode but only guarantees performance for linear distortion, and Level 2 means a terminal that supports full-duplex transmission mode and can operate even with nonlinear distortion. In addition, as additional information for nonlinear self-interference cancellation, nonlinear self-interference cancellation capability information can be defined. The terminal measures the size of the nonlinear self-interference cancellation capability for the transmitted signal power, and the base station can receive the size of the nonlinear interference cancellation capability from a terminal corresponding to duplex communication support level 2 as shown in [Table 4].

[0180] If a terminal is operating in linear self-interference cancellation mode near the boundary that supports full-duplex transmission mode, the terminal's transmission power may increase and the level of self-interference may increase as the distance between the terminal and the base station increases. In this case, if the base station determines that full-duplex transmission mode is maintainable after considering the terminal's nonlinear self-interference cancellation capability, the base station may instruct the terminal to operate in nonlinear self-interference cancellation mode and maintain full-duplex transmission mode.

[0181] Through this, the base station can operate the terminal in linear self-interference cancellation mode when the distance is relatively short, so that it can have advantages in terms of convergence time and power usage, and when the distance is far and the required self-interference signal cancellation gain is large, the terminal can be operated in nonlinear self-interference cancellation mode while maintaining full-duplex transmission mode.

[0182] FIG. 17 is a diagram illustrating signaling for a base station (1720) to receive information regarding self-interference cancellation of a terminal (1710) according to an embodiment of the present disclosure. Referring to FIG. 17, the base station can receive information regarding self-interference cancellation from the terminal through an RRC message during the initial registration process.

[0183] In step S1701, the base station (1720) transmits a UE capability inquiry message to the terminal (1710). Through the UE capability inquiry message, the base station (1720) can request information on connection status release, dual communication support capability, and nonlinear interference cancellation from the terminal.

[0184] In step S1703, the terminal (1710) that received the UE capability inquiry message from the base station (1720) transmits a UE capability information message to the base station (1720). The UE capability information message includes information on the dual communication support capability and nonlinear interference cancellation of the terminal (1710), and may be transmitted in an indexed form as shown in [Table 3] and [Table 4].

[0185] Although the terminals are classified into three categories in this disclosure, they may be classified into two or fewer or four or more categories, and the number of categories is not limited to a specific number. Furthermore, the nonlinear interference cancellation capability levels may be configured in different ranges and intervals, such as {0, 0.5, 1, 1.5, ..., 20}, and are not limited to specific ranges and intervals.

[0186] In another embodiment of the present disclosure, a terminal may determine the additional self-interference cancellation margin required in the current situation, compare the margin with the terminal's self-interference cancellation capability, and transmit the result to the base station. A 1-bit field, as shown in [Table 5], may be defined for this purpose.

[0187] FieldBitwidthSIC Margin Check1

[0188] If the terminal can overcome the additional interference due to additional self-interference cancellation, the terminal can assign 1 to the SIC margin check field and transmit it to the base station, and if it cannot overcome, the terminal can assign 0. The SIC margin check field can be transmitted in various ways. For example, the terminal can transmit the SIC margin check field value to the base station through the PUCCH (physical uplink control channel), and at this time, it can be transmitted as included in the UCI (uplink control information). As another example, the terminal can also transmit the SIC margin check field value through the PUSCH (physical uplink shared channel). The method for transmitting whether or not it can be overcome is not limited to the above-described method and can be implemented in various forms.

[0189] FIG. 18 is a flowchart illustrating a process in which a terminal and a base station operate in a full-duplex or half-duplex transmission mode based on a dual communication support capability level and a nonlinear self-interference cancellation capability according to an embodiment of the present disclosure.

[0190] In step S1801, the terminal performs an RRC connection with the base station. The RRC connection procedure can be performed using methods such as an RRC connection establishment procedure or an RRC reconfiguration procedure. Before performing the RRC connection procedure, the terminal can transmit information regarding the dual communication support capability level and nonlinear self-interference cancellation capability to the base station. As described above, the dual communication support capability level and nonlinear self-interference cancellation capability can be indexed and included in the UE capability information message. If the transmission mode is not determined, the half-duplex transmission mode can be set as the default value, and the RRC connection procedure can be performed in the half-duplex transmission mode.

[0191] In step S1803, the base station determines the transmission mode based on the dual communication support capability level received from the terminal. If the dual communication support capability level is 0, step S1805 is performed. If it is level 1, step S1807 is performed. If it is level 2, step S1809 is performed.

[0192] At step S1805, the base station and the terminal communicate in half-duplex mode. To this end, the base station may transmit a message to the terminal instructing it to communicate in half-duplex mode. Alternatively, if the terminal is configured to operate in half-duplex mode without a specific instruction, communication may continue in half-duplex mode without any further instruction.

[0193] In step S1807, the terminal communicates in full-duplex transmission mode using linear self-interference cancellation. To achieve this, the base station may instruct the terminal to communicate in half-duplex transmission mode using only linear self-interference cancellation. If the terminal exceeds the boundary where it can operate in full-duplex transmission mode, the base station may instruct the terminal to operate in half-duplex transmission mode.

[0194] In step S1809, the base station determines whether nonlinear interference cancellation is necessary. If nonlinear interference cancellation is not necessary, step S1807 is performed, thereby saving terminal power. If nonlinear interference cancellation is necessary, step S1811 is performed.

[0195] In step S1811, the terminal performs communication in full-duplex transmission mode using nonlinear self-interference cancellation. To this end, the base station can instruct the terminal to communicate in half-duplex transmission mode using nonlinear self-interference cancellation. Subsequently, the process returns to step S1809 and monitors whether nonlinear interference cancellation is still necessary. Therefore, the base station can detect cases where nonlinear interference cancellation is not necessary and instruct step S1807 to be performed.

[0196] FIG. 19 is a diagram illustrating a procedure for a terminal to perform full-duplex communication based on a dual communication support capability according to an embodiment of the present disclosure. First, in FIG. 19, if there is no separate setting for dual communication between the terminal and the base station, communication may be configured to be performed in a half-duplex transmission mode. In step S1901, the terminal transmits terminal capability information related to full-duplex communication to the base station. The terminal capability information may include at least one of information regarding the terminal's connection state release, dual communication support capability, and nonlinear interference cancellation. The base station may request the terminal to transmit terminal capability information related to full-duplex communication by transmitting a UE capability inquiry message. Thereafter, the terminal may receive the UE capability inquiry message and transmit a UE capability information message including the information requested by the base station to the base station.

[0197] Among terminal capability information related to full-duplex communication, dual-communication support capability can be determined based on whether full-duplex communication is supported and whether nonlinear interference cancellation is supported. Terminal capability information related to full-duplex communication can be indexed and transmitted using a codebook. For example, when information on dual-communication support capability and nonlinear interference cancellation capability is requested, the terminal can transmit information on dual-communication support capability and nonlinear interference cancellation capability by classifying them based on [Table 3] and [Table 4], as described above in FIG. 17.

[0198] In step S1903, the terminal performs an RRC connection procedure with the base station. Through the RRC connection procedure, the terminal can obtain transmission mode information from the base station. To this end, the base station can determine the transmission mode for communication with the terminal based on the terminal capability information received in step S1901. Furthermore, the transmission mode can be one of the following: a half-duplex communication mode, a full-duplex communication mode utilizing only linear self-interference cancellation, or a full-duplex communication mode utilizing nonlinear self-interference cancellation.

[0199] In step S1905, the terminal transmits and receives data with the base station based on the received transmission mode information. If full-duplex communication with the terminal is possible with linear self-interference cancellation alone, the base station can reduce the power consumption of the terminal by instructing the terminal to use a transmission mode that does not use nonlinear self-interference cancellation. Furthermore, if full-duplex communication is not possible with linear self-interference cancellation alone, the base station can instruct the terminal to use nonlinear self-interference cancellation. This allows the terminal to secure additional gain and expand the radius of full-duplex communication. Subsequently, the degree of self-interference may change due to movement of the terminal or changes in the channel environment, which may necessitate a change in the communication mode.

[0200] FIG. 20 is a diagram illustrating a procedure for monitoring self-interference and changing a transmission mode according to an exemplary embodiment of the present disclosure. In step S2001, as described above in FIG. 19, a terminal can communicate with a base station based on its dual communication support capability.

[0201] In step S2003, the terminal performs self-interference measurements. The C / N ratio may increase or decrease due to changes in the terminal's movement or channel environment. Therefore, the terminal can continuously measure self-interference. The self-interference measurements can be configured in various ways. For example, the base station may instruct the terminal to perform periodic monitoring. As another example, the base station may monitor for full-duplex signal transmission / reception failures, and if the transmission / reception failures persist for a certain period of time or the number of transmission / reception failures exceeds a preset number, the base station may instruct the terminal to perform self-interference monitoring.

[0202] In step S2005, the terminal transmits to the base station whether interference has been overcome. The terminal can determine whether interference has been overcome based on changes in transmit power, changes in receive power, and whether nonlinear interference cancellation is possible. In other words, a terminal that utilizes only linear self-interference cancellation can achieve additional interference cancellation by utilizing nonlinear self-interference cancellation when self-interference increases. If the C / N for full-duplex communication can be maintained due to additional interference cancellation, the terminal can transmit to the base station that interference has been overcome. The terminal can transmit whether interference has been overcome due to changed self-interference through the PUCCH or PUSCH using the SIC margin check field value as described in [Table 5].

[0203] In step S2007, the transmission mode is received from the base station. The base station can reset the transmission mode based on whether interference received from the terminal has been overcome. If the terminal's self-interference is reduced while communicating in half-duplex mode, the transmission mode can be switched to full-duplex mode depending on whether interference has been overcome, and vice versa. In this case, the base station does not have to determine the transmission mode depending on whether the terminal has overcome interference. For example, even if a terminal performing full-duplex communication transmits that it can overcome additional interference, the base station can determine that the terminal performs half-duplex communication based on communication traffic, load balance, communication purpose, etc.

[0204] FIG. 21 is a diagram illustrating a procedure for a base station to perform full-duplex communication based on a dual communication support capability according to an embodiment of the present disclosure. As described above, if there is no separate configuration for dual communication between a terminal and a base station, communication may be configured to be performed in a half-duplex transmission mode. In step S2101, the base station receives terminal capability information related to full-duplex communication from the terminal. The terminal capability information may include at least one of information regarding the terminal's connection state release, dual communication support capability, and nonlinear interference cancellation. The base station may request the terminal to transmit terminal capability information related to full-duplex communication by transmitting a UE capability inquiry message. Thereafter, the base station may receive a UE capability information message from the terminal. The terminal capability information related to full-duplex communication may be indexed and transmitted as described above.

[0205] In step S2103, the base station and the terminal perform an RRC connection procedure. Through the RRC connection procedure, the base station can transmit transmission mode information to the terminal. The transmission mode can be one of the following: half-duplex mode, full-duplex mode utilizing only linear self-interference cancellation, or full-duplex mode utilizing nonlinear self-interference cancellation.

[0206] In step S2105, the terminal transmits and receives data with the base station based on the received transmission mode information. If full-duplex communication with the terminal is possible with linear self-interference cancellation alone, the base station can reduce the power consumption of the terminal by instructing the terminal to use a transmission mode that does not use nonlinear self-interference cancellation. Furthermore, if full-duplex communication is not possible with linear self-interference cancellation alone, the base station can instruct the terminal to use nonlinear self-interference cancellation. This allows the terminal to secure additional gain and expand the radius of full-duplex communication. Subsequently, the degree of self-interference may change due to movement of the terminal or changes in the channel environment, which may necessitate a change in the communication mode.

[0207] It is clear that the examples of the proposed methods described above can also be considered as a type of proposed methods, as they can be included as one of the implementation methods of the present disclosure. Furthermore, the proposed methods described above can be implemented independently, but they can also be implemented in the form of a combination (or merge) of some of the proposed methods. Information regarding the applicability of the proposed methods (or information regarding the rules of the proposed methods) can be defined by a rule such that the base station notifies the terminal of the application of the proposed methods through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0208] The present disclosure may be embodied in other specific forms without departing from the technical ideas and essential features described herein. Therefore, the above detailed description should not be construed as limiting in all respects but rather as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure are intended to be included within the scope of the present disclosure. Furthermore, claims that do not explicitly cite each other in the claims may be combined to form embodiments or incorporated into new claims through post-filing amendments.

[0209] Embodiments of the present disclosure can be applied to various wireless access systems. Examples of various wireless access systems include the 3rd Generation Partnership Project (3GPP) or 3GPP2 systems.

[0210] The embodiments of the present disclosure can be applied not only to the various wireless access systems described above, but also to all technical fields that utilize these various wireless access systems. Furthermore, the proposed method can also be applied to mmWave and THz communication systems utilizing ultra-high frequency bands.

[0211] Additionally, embodiments of the present disclosure can be applied to various applications such as autonomous vehicles and drones.

Claims

1. In a method of operating a terminal in a wireless communication system, A step of transmitting terminal capability information to a base station, wherein the terminal capability information includes duplex support capability and nonlinear interference rejection capability information. A step of performing an RRC (radio resource control) connection procedure with the base station, wherein information regarding a transmission mode determined based on the terminal capability information is acquired through the RRC connection procedure; and Including a step of transmitting and receiving data with the base station based on information about the above transmission mode, A method of operating a terminal, wherein the above transmission mode is one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation and nonlinear magnetic interference cancellation.

2. In paragraph 1, A step for performing measurements on magnetic interference; A step of determining whether to overcome self-interference based on the above measurement and transmitting the determined self-interference overcoming status to the base station; and A method of operating a terminal, further comprising the step of receiving an updated transmission mode from the base station, wherein the transmission mode is updated by the base station based on whether the self-interference is overcome.

3. In paragraph 2, A method of operating a terminal, wherein the measurement of the above magnetic interference is performed at preset intervals.

4. In paragraph 2, Further comprising a step of monitoring transmission and reception failure of full-duplex communication, A method of operating a terminal, wherein the measurement of the above self-interference is performed when the above transmission / reception failures exceed a preset number of times.

5. In paragraph 4, A terminal operation method in which the above self-interference is overcome or not, and is transmitted in UCI (uplink control information).

6. In paragraph 5, The above UCI is a method of operating a terminal, transmitted through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

7. In paragraph 2, A terminal operation method in which the above self-interference overcoming is determined based on the results of comparing the interference cancellation margin and the nonlinear self-interference cancellation capability.

8. In paragraph 2, A method of operating a terminal, which performs communication in the first transmission mode when performing the RRC connection procedure or when the determined transmission mode is not obtained through the RRC connection procedure.

9. In paragraph 1, A method of operating a terminal, wherein, in a situation where the terminal transmits and receives the data with the base station based on the second transmission mode, if the measured self-interference cannot be eliminated with linear interference cancellation capability, the terminal transmits information that self-interference cannot be overcome to the base station, and receives the updated transmission mode indicating the third transmission mode from the base station, thereby transmitting and receiving the data with the base station based on the third transmission mode.

10. In paragraph 1, A method of operating a terminal, wherein, in a situation where the terminal transmits and receives the data with the base station based on the third transmission mode, if the measured self-interference can perform full-duplex communication with only linear interference cancellation capability, self-interference surmounting capability information is transmitted to the base station, and the updated transmission mode indicating the second transmission mode is received from the base station, thereby transmitting and receiving the data with the base station based on the second transmission mode.

11. In paragraph 1, The step of transmitting the above terminal capability information is: A step of receiving a UE capability inquiry message from the base station; and Including a step of transmitting a UE capability information message to the base station, A method of operating a terminal, wherein the UE capability information message includes the terminal capability information.

12. In paragraph 1, A terminal operation method in which the above duplex communication support capability is determined based on whether full-duplex communication is supported and whether nonlinear interference cancellation is supported.

13. In the 12th paragraph, the dual communication support capability and nonlinear interference removal capability are transmitted through the index value of the codebook. A method of operating a terminal, wherein the above duplex communication support capability is classified into a terminal that does not support full-duplex transmission mode, a terminal that supports full-duplex transmission mode but uses linear magnetic interference cancellation, and a terminal that supports full-duplex transmission mode and uses nonlinear magnetic interference cancellation.

14. In paragraph 1, Even-order nonlinear interference is removed by passing the received signal through a low pass filter (LPF). An operating method of a terminal that removes odd-order nonlinear interference by subtracting the weighted sum of odd-order nonlinear interferences from a signal passing through the LPF.

15. In a method of operating a base station in a wireless communication system, A step of receiving terminal capability information from a terminal, wherein the terminal capability information includes dual communication support capability and nonlinear interference cancellation capability information, A step of performing an RRC (radio resource control) connection procedure with the terminal, wherein information regarding a transmission mode determined based on the terminal capability information is transmitted to the terminal through the RRC connection procedure; and Including a step of transmitting and receiving data with the terminal based on information about the above transmission mode, A method of operating a base station, wherein the above transmission mode is one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation and nonlinear magnetic interference cancellation.

16. In a wireless communication system, at a terminal, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Transmit terminal capability information to a base station, wherein the terminal capability information includes duplex support capability and nonlinear interference rejection capability information. Performing an RRC (radio resource control) connection procedure with the base station, and obtaining information about a transmission mode determined based on the terminal capability information through the RRC connection procedure; and Control to transmit and receive data with the base station based on information about the above transmission mode, The terminal, wherein the above transmission mode is one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation and nonlinear magnetic interference cancellation.

17. In a base station in a wireless communication system, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Receive terminal capability information from a terminal, wherein the terminal capability information includes dual communication support capability and nonlinear interference rejection capability information, Performing an RRC (radio resource control) connection procedure with the terminal, and transmitting information about a transmission mode determined based on the terminal capability information to the terminal through the RRC connection procedure; and Control to transmit and receive data with the terminal based on information about the above transmission mode, A base station, wherein the above transmission mode is one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation and nonlinear magnetic interference cancellation.

18. In communication devices, At least one processor; At least one computer memory connected to said at least one processor and storing instructions that direct operations when executed by said at least one processor, The above actions are, A step of transmitting terminal capability information to a base station, wherein the terminal capability information includes dual communication support capability and nonlinear interference rejection capability information, A step of performing an RRC (radio resource control) connection procedure with the base station, wherein information regarding a transmission mode determined based on the terminal capability information is acquired through the RRC connection procedure; and Including a step of transmitting and receiving data with the base station based on information about the above transmission mode, A communication device, wherein the above transmission mode is one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation and nonlinear magnetic interference cancellation.

19. In a non-transitory computer-readable medium storing at least one instruction, comprising at least one instruction executable by the processor, At least one of the above commands causes the device to: Transmit terminal capability information to a base station, wherein the terminal capability information includes dual communication support capability and nonlinear interference rejection capability information. Performing an RRC (radio resource control) connection procedure with the base station, and obtaining information about a transmission mode determined based on the terminal capability information through the RRC connection procedure; and Control to transmit and receive data with the base station based on information about the above transmission mode, A computer-readable medium, wherein the transmission mode is one of a first transmission mode which is a half-duplex transmission mode, a second transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation, and a third transmission mode which is a full-duplex transmission mode using linear magnetic interference cancellation and nonlinear magnetic interference cancellation.

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