Method and device for transmitting and receiving information for interference measurement and report in wireless communication system

Abstract

A method for transmitting multi-user interference (MUI) information by a terminal in a wireless communication system according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, configuration information related to an MUI report; receiving, from the base station, a reference signal (RS) for acquiring MUI information; acquiring the MUI information on the basis of the configuration information related to the MUI report and the RS for acquiring the MUI information; and transmitting the MUI report to the base station on the basis of the configuration information related to the MUI report.

Description

Method and apparatus for transmitting and receiving information for interference measurement and reporting in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and more specifically to a method and apparatus for transmitting and receiving information for measuring and reporting multi-user interference for multi-user (MU) MIMO scheduling in a Multiple-Input Multiple-Output (MIMO) system.

[0002] Looking back at the evolution of wireless communication through successive generations, technologies have been developed primarily for human-oriented services, such as voice, multimedia, and data. Following the commercialization of 5G (5th-generation) communication systems, connected devices, which have been increasing explosively, are expected to be connected to communication networks. Examples of networked objects include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to evolve into various form factors, such as augmented reality glasses, virtual reality headsets, and holographic devices. In the 6G (6th-generation) era, efforts are underway to develop improved 6G communication systems to connect hundreds of billions of devices and objects to provide diverse services. For this reason, 6G communication systems are referred to as "beyond 5G" systems.

[0003] In the 6G communication system predicted to be realized around 2030, the maximum transmission speed is tera (i.e., 1,000 gigabit) bps, and the wireless latency is 100 microseconds (μsec). In other words, compared to the 5G communication system, the transmission speed in the 6G communication system is 50 times faster, and the wireless latency is reduced to one-tenth.

[0004] To achieve such high data transmission speeds and ultra-low latency, 6G communication systems are being considered for implementation in the terahertz (THX) band (e.g., the 95 GHz to 3 terahertz (3THz) band). In the terahertz band, due to more severe path loss and atmospheric absorption compared to the millimeter wave (mmWave) band introduced in 5G, the importance of technology capable of guaranteeing signal reach, or coverage, is expected to increase. As key technologies to ensure coverage, radio frequency (RF) devices, antennas, new waveforms that offer better coverage than orthogonal frequency division multiplexing (OFDM), beamforming, and multi-antenna transmission technologies such as massive multiple-input and multiple-output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas must be developed. In addition, new technologies are being discussed to improve coverage of terahertz band signals, including metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).

[0005] In addition, to improve frequency efficiency and system network, development is underway in 6G communication systems for full duplex technology, in which uplink and downlink simultaneously utilize the same frequency resources at the same time; network technology that integrates satellites and HAPS (high-altitude platform stations); network structure innovation technology that supports mobile base stations and enables network operation optimization and automation; dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction; AI-based communication technology that utilizes AI (artificial intelligence) from the design stage and internalizes end-to-end AI support functions to realize system optimization; and next-generation distributed computing technology that realizes services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high performance communication and computing resources (mobile edge computing (MEC), cloud, etc.). In addition, attempts are continuing to further strengthen connectivity between devices, further optimize networks, promote the softwareization of network entities, and increase the openness of wireless communication through the design of new protocols to be used in 6G communication systems, the implementation of hardware-based security environments, the development of mechanisms for the safe utilization of data, and the development of technologies regarding privacy maintenance methods.

[0006] Due to the research and development of such 6G communication systems, it is expected that a new dimension of hyper-connected experience will become possible through the hyper-connectivity of 6G communication systems, which encompasses not only connections between objects but also connections between people and objects. Specifically, it is projected that 6G communication systems will enable the provision of services such as truly immersive extended reality (truly immersive XR), high-fidelity mobile holograms, and digital replicas. Furthermore, services such as remote surgery, industrial automation, and emergency response, which are provided through 6G communication systems with enhanced security and reliability, will be applied in various fields including industry, healthcare, automotive, and home appliances.

[0007] One embodiment of the present disclosure can prevent cases where, when using a Type I CSI codebook, the absence of multi-user interference is assumed or incorrectly assumed due to the orthogonality of the codebook itself, and can provide a more appropriate and effective MU scheduling method.

[0008] The technical problem to be solved by one embodiment of the present disclosure is not limited to the technical problem described above, and other technical problems can be inferred from the following embodiments.

[0009] A method for a terminal to transmit multi-user interference (MUI) information in a wireless communication system according to one embodiment of the present disclosure may include: receiving configuration information related to an MUI report from a base station; receiving a reference signal (RS) for obtaining an MUI from a base station; obtaining an MUI based on the configuration information related to the MUI report and the RS for obtaining an MUI; and transmitting an MUI report to a base station based on the configuration information related to the MUI report.

[0010] FIG. 1 is a drawing for illustrating a communication network according to one embodiment of the present disclosure.

[0011] FIG. 2a is a diagram illustrating a data transmission path according to one embodiment of the present disclosure.

[0012] FIG. 2b is a drawing for illustrating a data reception path according to one embodiment of the present disclosure.

[0013] FIG. 3a is a drawing illustrating a user terminal (user equipment, UE) according to one embodiment of the present disclosure.

[0014] FIG. 3b is a drawing illustrating a base station (BS) according to one embodiment of the present disclosure.

[0015] FIG. 4 is a diagram illustrating a cross-polarized multiple input multiple output (MIMO) antenna system according to one embodiment of the present disclosure.

[0016] FIG. 5 is a diagram illustrating channel state information reference signal (CSI-RS) resource mapping in an orthogonal frequency division multiple access (OFDM) time-frequency grid according to one embodiment of the present disclosure.

[0017] FIG. 6a is a diagram illustrating multi-user scheduling in a multi-user (MU) MIMO communication system according to one embodiment of the present disclosure.

[0018] FIG. 6b is a diagram illustrating multi-user scheduling in a multi-user (MU) MIMO communication system according to one embodiment of the present disclosure.

[0019] FIG. 6c is a diagram illustrating multi-user scheduling in a multi-user (MU) MIMO communication system according to one embodiment of the present disclosure.

[0020] FIG. 7a is a diagram illustrating the MUI measurement setting and MUI reporting procedure according to one embodiment of the present disclosure.

[0021] FIG. 7b is a diagram illustrating the MUI measurement setting and MUI reporting procedure according to one embodiment of the present disclosure.

[0022] FIG. 8a is a diagram illustrating a specific method for setting up an MUI report according to one embodiment of the present disclosure.

[0023] FIG. 8b is a diagram illustrating a specific method for setting up an MUI report according to one embodiment of the present disclosure.

[0024] FIG. 8c is a diagram illustrating a specific method for setting up an MUI report according to one embodiment of the present disclosure.

[0025] FIG. 8d is a drawing illustrating a specific method for setting up an MUI report according to one embodiment of the present disclosure.

[0026] FIG. 9a is a diagram illustrating a method for transmitting an MUI-PMI list to be measured by a terminal according to one embodiment of the present disclosure.

[0027] FIG. 9b is a diagram illustrating a method for transmitting an MUI-PMI list to be measured by a terminal according to one embodiment of the present disclosure.

[0028] FIG. 10a is a drawing for explaining a method of selecting and transmitting MUI information according to a setting, according to one embodiment of the present disclosure.

[0029] FIG. 10b is a drawing for explaining a method of selecting and transmitting MUI information according to a setting, according to one embodiment of the present disclosure.

[0030] FIG. 11 is a flowchart of a method for a terminal to report an MUI to a base station according to one embodiment of the present disclosure.

[0031] FIG. 12 is a flowchart of a method for a base station to receive an MUI report from a terminal according to one embodiment of the present disclosure.

[0032] FIG. 13 is a block diagram schematically illustrating the configuration of a base station according to one embodiment of the present disclosure.

[0033] FIG. 14 is a block diagram schematically illustrating the configuration of a terminal according to one embodiment of the present disclosure.

[0034] A method for a terminal to transmit multi-user interference (MUI) information in a wireless communication system, disclosed as a technical means for achieving the technical problem described above, may include: receiving configuration information related to an MUI report from a base station; receiving a reference signal (RS) for acquiring an MUI from a base station; acquiring an MUI based on the configuration information related to the MUI report and the RS for acquiring an MUI; and transmitting an MUI report to a base station based on the configuration information related to the MUI report.

[0035] A method for a base station to receive multi-user interference (MUI) information in a wireless communication system, disclosed as a technical means for achieving the technical task described above, may include: transmitting configuration information related to a multi-user (MU) interference (MUI) report to a terminal; transmitting a reference signal (RS) for acquiring an MUI to a terminal; and receiving a report on an MUI acquired based on the configuration information related to the MUI report and the RS for acquiring the MUI, based on the configuration information related to the MUI report.

[0036] A terminal for transmitting multi-user interference (MUI) information in a wireless communication system, disclosed as a technical means for achieving the technical problem described above, comprises: a transceiver; and at least one processor, wherein the at least one processor controls the transceiver to receive configuration information related to an MUI report from a base station, controls the transceiver to receive a reference signal (RS) for acquiring an MUI from a base station, acquires an MUI based on the configuration information related to an MUI report and the RS for acquiring an MUI, and controls the transceiver to transmit an MUI report to a base station based on the configuration information related to an MUI report.

[0037] A base station for receiving multi-user interference (MUI) information in a wireless communication system, disclosed as a technical means for achieving the technical problem described above, comprises: a transceiver; and at least one processor; wherein the at least one processor controls the transceiver to transmit configuration information related to a multi-user (MU) interference (MUI) report to a terminal, controls the transceiver to transmit a reference signal (RS) for acquiring an MUI to a terminal, and controls the transceiver to receive a report on an MUI acquired based on the configuration information related to the MUI report and the RS for acquiring an MUI.

[0038] A computer-readable recording medium disclosed as a technical means for achieving the above-described technical task may have a program stored therein for executing at least one of the embodiments of the disclosed method on a computer.

[0039] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0040] In describing the present disclosure, technical details that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure are omitted. This is intended to convey the essence of the present disclosure more clearly without obscuring it by omitting unnecessary explanations. Furthermore, the terms described below are defined considering their functions within the present disclosure, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0041] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0042] The advantages and features of the present disclosure, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration might unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the specification.

[0043] Hereinafter, a base station (BS) is an entity that performs resource allocation for terminals and may be at least one of gNode B, eNode B, Node B (or xNode B (where x is an alphabet including g and e)), a radio access unit, a base station controller, a satellite, an airborn, or a node on a network. A terminal (user equipment, UE) may include a Mobile Station (MS), a Vehicular, a satellite, an airborn, a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) may represent a radio transmission path for a signal transmitted by a base station to a terminal, and an uplink (UL) may represent a radio transmission path for a signal transmitted by a terminal to a base station. Additionally, a sidelink (SL) may exist, which refers to a radio transmission path for a signal transmitted by a terminal to another terminal.

[0044] In addition, while LTE, LTE-A, or 5G systems may be described below as examples, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5G-Advance or NR-Advance or 6th generation mobile communication technology (6G) developed after 5G mobile communication technology (or new radio, NR) may be included, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0045] Wireless communication is one of the most successful innovations in modern history. Recently, the number of wireless communication service subscribers exceeded 5 billion and continues to grow rapidly. As the popularity of various mobile data devices—such as smartphones, tablets, "notepad" computers, netbooks, and e-book readers—increases among consumers and the industry, the demand for mobile data traffic is rising rapidly. To meet this high growth in mobile data traffic and support the deployment of new applications, improving the efficiency and coverage of radio interfaces is crucial.

[0046] 5G communication systems are being developed and deployed to meet the demand for wireless data traffic, which has been increasing since the deployment of 4G communication systems, and to enable various vertical applications.

[0047] 5G communication systems enable high data rates by including 28 GHz or 60 GHz bands, or high frequency (mmWave) bands above 6 GHz, or enable strong coverage and mobility support in low frequency bands below 6 GHz. An embodiment of the present disclosure may be applied to such 5G communication systems, 6G, or subsequent releases utilizing the THz band. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, FD-MIMO (Full Dimensional MIMO), array antennas, analog beamforming, and massive antenna technologies may be discussed in a wireless communication system according to an embodiment of the present disclosure.

[0048] In 5G communication systems, improved small cells, cloud RAN (Radio Access Network), ultra-high density networks, D2D (Device-to-Device) communication, wireless backhaul, mobile networks, cooperative communication, CoMP (Coordinated Multi-points), and receiver interference cancellation are being developed to improve the system's network. In 5G communication systems, Hybrid FSK (Frequency Shift Keying), FQAM (Feher's Quadrature Amplitude Modulation), and SWSC (Sliding Window Superposition Coding) are being developed as Advanced Coding Modulation (ACM), and Filter Bank Multi Carrier (FBMC), Non-Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA) are being developed as improved access technologies.

[0049] The Internet, a human-centered connectivity network where humans generate and consume information, is evolving into the Internet of Things (IoT), which enables the exchange and processing of information among distributed components, such as objects, without human intervention. The Internet of Everything (IoE) has emerged as a combination of IoT technology and big data processing technology through connections with cloud servers. As technological elements such as "sensing technology," "wired / wireless communication and network infrastructure," "service interface technology," and "security technology" are required for IoT implementation, research is being conducted on sensor networks, Machine-to-Machine (M2M) communication, and Machine-Type Communication (MTC). This IoT environment can provide intelligent IT services that create new value for human life by collecting and analyzing data generated from connected objects. Through the convergence and integration of existing Information Technology (IT) technologies with various industrial applications, IoT can be applied to diverse fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0050] 5G communication systems can be applied to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communication can be implemented using beamforming, MIMO, and array antennas. Applying Cloud RAN (Radio Access Network) as a big data processing technology can be an example of convergence between 5G technology and IoT technology.

[0051] In one embodiment of the present disclosure, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams may be executed by computer program instructions. Since these computer program instructions may be loaded into the processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means for performing the functions described in the flow diagram block(s). Since these computer program instructions may also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in the computer-available or computer-readable memory may also produce a manufactured item containing instruction means for performing the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0052] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specified logical function(s). Also, it should be noted that in some alternative practices, the functions mentioned in the blocks may occur out of order. For example, two blocks depicted in succession may actually be performed substantially simultaneously, or the blocks may sometimes be performed in reverse order according to the corresponding function. For example, the depicted series of steps may overlap, occur in parallel, occur in a different order, or occur multiple times, with various steps included in different drawings. Also, in some examples, steps may be omitted or replaced by other steps.

[0053] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0054] Terms used in the following description to refer to broadcast information, control information, communication coverage, state changes (e.g., events), network entities, messages, and device components are examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

[0055] For the convenience of the following explanation, the present invention uses terms and names defined in the LTE and NR specifications, which are the most recent standards defined by the 3GPP (The 3rd Generation Partnership Project) among currently existing communication standards. However, the present invention is not limited by the above terms and names and can be applied in the same way to systems conforming to other standards.

[0056] FIG. 1 is a drawing for explaining a communication network (100) according to one embodiment of the present disclosure.

[0057] The communication network (100) illustrated in FIG. 1 is merely one example, and various embodiments of the communication network (100) not limited to FIG. 1 may be applied to one embodiment of the present disclosure.

[0058] A wireless communication system, or a communication network (100) according to one embodiment of the present disclosure, may include at least one of a 5th generation (5G) standalone network, a 5G non-standalone (NAS) network, or a 6th generation (6G) network.

[0059] Referring to FIG. 1, a communication network (100) may include a first base station (101) (e.g., gNB(gNodeB)), a second base station (102), and a third base station (103). The first base station (101) may communicate with the second base station (102) and the third base station (103). The first base station (101) may also communicate with at least one IP (Internet Protocol) network (130), e.g., the Internet, a proprietary IP network, or other data networks.

[0060] In one embodiment, depending on the type of communication network (100), 'base station' or 'gNB' may refer to various components (or a collection of components) configured to provide wireless access to an IP network (130) to remote terminals, such as a base station, a wireless base station, a TP (transmit point), a TRP (transmit-receive point), a ground gateway, an airborne gNB, a satellite system, a mobile base station, a macrocell, a femtocell, a WiFi access point (AP), etc. Additionally, depending on the type of communication network (100), various terms such as "mobile station," "subscriber station," "remote terminal," "wireless terminal," or "user device" may be used instead of "user terminal" or "UE." Hereinafter, for convenience, a device wirelessly connected to a gNB is referred to as a "user terminal" or "UE" in this disclosure. The UE may be a mobile device or a fixed device. For example, the UE may be a mobile phone, smartphone, monitoring device, alarm device, vehicle management device, asset tracking device, automobile, desktop computer, entertainment device, infotainment device, vending machine, electric meter, water meter, gas meter, security device, sensor device, home appliance, etc.

[0061] Referring to FIG. 1, a second base station (102) can provide wireless broadband access to an IP network (130) to a plurality of first user devices (UEs) within the coverage area (120) of the second base station (102). The plurality of first UEs may include a UE (111) that may be located in a small business (SB); a UE (112) that may be located in an enterprise (E); a UE (113) that may be located in a WiFi hotspot (HS); a UE (114) that may be located in a first residence (R); a UE (115) that may be located in a second residence (R); and a UE (116) that may be a mobile device (M), e.g., a cell phone, a wireless laptop, a wireless PDA, etc. The third base station (103) can provide wireless broadband access to an IP network (130) to a plurality of second UEs within the coverage area (125) of the third base station (103). The plurality of second UEs may include UE (115) and UE (116). In some embodiments, one or more base stations (101, 102, 103) may communicate with each other using 5G, LTE (long-term evolution), LTE-A, WiMAX, or other wireless communication technologies, and each may communicate with at least one UE (111–116).

[0062] Referring to FIG. 1, dotted lines indicate the approximate range of the coverage areas (120, 125) of the base stations, and the coverage areas (120, 125) are drawn in a circular shape for the purpose of illustration and explanation only. In one embodiment, the coverage areas for the base stations, for example, the coverage area (120) of the second base station (102) and the coverage area (125) of the third base station (103), may have various shapes, such as irregular shapes, depending on the configuration of each base station and changes in the wireless environment associated with natural or artificial obstacles.

[0063] As described with reference to FIG. 4, which will be described later, at least one of the first base station (101), the second base station (102), or the third base station (103) may include two-dimensional antenna arrays. In one embodiment, at least one of the first base station (101), the second base station (102), or the third base station (103) may support a codebook design and structure for a system having two-dimensional antenna arrays.

[0064] FIG. 1 illustrates one embodiment of a communication network (100), and various modifications to FIG. 1 may be made. For example, the communication network (100) may include any number of gNBs in various arrangements and any number of UEs. Additionally, the first base station (101) may communicate directly with any number of UEs and provide the UEs with wireless broadband access to the IP network (130). Likewise, the second base station (102) and the third base station (103) may also communicate directly with the IP network (130) and provide wireless broadband access to the IP network (130) to the connected UEs. In one embodiment, the first base station (101), the second base station (102), and the third base station (103) may also provide access to an additional external network or other type of data network.

[0065] FIG. 2a is a drawing for explaining a data transmission path (200) according to one embodiment of the present disclosure, and FIG. 2b is a drawing for explaining a data reception path (250) according to one embodiment of the present disclosure.

[0066] In one embodiment, the data transmission path (200) may be implemented at a base station (e.g., the second base station (102) of FIG. 1) and the data reception path (250) may be implemented at a terminal (e.g., the UE (116) of FIG. 1). However, in one embodiment, the data reception path (250) may be implemented at a base station and the data transmission path (200) may be implemented at a terminal. In one embodiment, the data reception path (250) may be configured to support a codebook design and structure for a system including a two-dimensional antenna array as described in one embodiment of the present disclosure.

[0067] Referring to FIG. 2a, the data transmission path (200) may include a channel coding and modulation block (205), a serial-to-parallel (S-to-P) block (210), an inverse fast Fourier transform (IFFT) block of size N (215), a parallel-to-serial (P-to-S) block (220), a cyclic prefix addition block (225), and an up-converter (UC) (230).

[0068] Referring to FIG. 2b, the data receiving path (250) may include a down-converter (DC) (255), a circular prefix deletion block (260), a serial-to-parallel (S-to-P) block (265), a fast Fourier transform (FFT) block of size N (270), a parallel-to-serial (P-to-S) block (275), and a channel decoding and demodulation block (280).

[0069] In the data transmission path (200), the channel coding and modulation block (205) can receive a set of information bits, apply coding (e.g., LDPC (low-density parity check) coding), and modulate the input bits (e.g., QPSK (quadrature phase shift keying) or QAM (quadrature amplitude modulation)) to generate a sequence of frequency domain modulated symbols. The serial-parallel block (210) can convert the serially modulated symbols into parallel data (e.g., de-multiplex) to generate N parallel symbol streams. Here, N may be the size of the IFFT or FFT used in the base station (e.g., the second base station (102) of FIG. 1) and the terminal (e.g., the UE (116) of FIG. 1). The IFFT block (215) of size N can perform an IFFT operation on the N parallel symbol streams to generate time domain output signals. A parallel-serial block (220) can generate a serial time-domain signal by converting (e.g., multiplexing) serial time-domain output symbols from an IFFT block (215) of size N. A cyclic prefix addition block (225) can insert a cyclic prefix into the time-domain signal. An upconverter (230) can convert (e.g., upconvert) the output of the cyclic prefix addition block (225) to an RF frequency for data transmission over a wireless channel. In one embodiment, the signal may be filtered in baseband before being converted to an RF frequency.

[0070] In one embodiment, when an RF signal transmitted from a base station passes through a wireless channel and arrives at a terminal, inverse operations for operations at the base station can be performed at the terminal. Referring to FIG. 2b, a down-converter (255) can down-convert the received signal to a baseband frequency, and a circular prefix removal block (260) can remove circular prefixes to generate a serial time-domain baseband signal. A serial-to-parallel block (265) can convert the time-domain baseband signal into parallel time-domain signals. An FFT block (270) of size N can perform an FFT algorithm to generate N parallel frequency-domain signals. A parallel-to-serial block (275) can convert the parallel frequency-domain signals into a sequence of modulated data symbols. A channel decoding and demodulation block (280) can demodulate and decode the modulated symbols to restore the original input data stream.

[0071] The base station can implement a data transmission path (200) to a terminal in a downlink scenario and a data reception path (250) from the terminals in an uplink scenario. Similarly, terminals can implement a data transmission path (200) to the base station in an uplink scenario and a data reception path (250) from the base station in a downlink scenario.

[0072] Each of the blocks illustrated in FIG. 2a or FIG. 2b may be implemented through hardware or a combination of hardware and software or firmware. In one embodiment, at least some of the blocks of FIG. 2a or FIG. 2b may be implemented in software, and other components may be implemented in hardware or a combination of hardware and software. For example, the FFT block (270) of FIG. 2b and the IFFT block (215) of FIG. 2a may be implemented with software algorithms, wherein the value of size N may be determined according to the embodiment.

[0073] Although an embodiment using FFT and IFFT has been described with reference to FIG. 2a and 2b, this is merely an exemplary method and should not be interpreted to limit the scope of the disclosure. In one embodiment, various types of transforms, such as Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions, may be used. For example, the value of variable N may have integer values ​​(e.g., 1, 2, 3, 4, ...) for DFT and IDFT functions, and powers of 2 values ​​(e.g., 1, 2, 4, 8, 16, ...) for FFT and IFFT functions.

[0074] FIGS. 2a and 2b illustrate an exemplary wireless data transmission path (200) and a data reception path (250), but various modifications to FIGS. 2a and 2b may be made in one embodiment. For example, various components of FIGS. 2a and 2b may be combined, subdivided, or omitted, and additional components may be added according to specific requirements. Additionally, FIGS. 2a and 2b are intended to illustrate exemplary types of data transmission paths and data reception paths that may be used in a wireless communication network. Various suitable structures may be used to support wireless communication in a wireless network according to one embodiment.

[0075] FIG. 3a is a drawing illustrating a user terminal (user equipment, UE) (116) according to one embodiment of the present disclosure.

[0076] The user terminal of FIG. 3a may be represented as a terminal or a UE. The terminal (116) shown in FIG. 3a may correspond to at least one of the UEs (111–116) of FIG. 1. A terminal according to one embodiment of the present disclosure may be provided in various configurations and is not limited to the exemplary terminal (116) shown in FIG. 3a.

[0077] Referring to FIG. 3a, the terminal (116) may include at least one antenna (305), a radio frequency (RF) transceiver (310), a transmit (TX) processing circuit (315), a microphone (320), and a receive (RX) processing circuit (325). The terminal (116) may also include a speaker (330), a controller or processor (340), an input / output (I / O) interface (IF) (345), an input device (350) such as a keypad, a display (355), and a memory (360). The memory (360) may include a basic operating system (OS) program (361) and at least one application (362).

[0078] The RF transceiver (310) can receive an incoming RF signal transmitted by a base station of a communication network from an antenna (305). The RF transceiver (310) can down-convert the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to an RX processing circuit (325), and the RX processing circuit (325) can generate a processed baseband signal by filtering, decoding, or digitizing the baseband or IF signal. The RX processing circuit (325) can transmit the processed baseband signal to a speaker (330) (for voice data) or to a processor (340) (for web browsing data) for further processing.

[0079] The TX processing circuit (315) can receive analog or digital voice data from the microphone (320) or other outgoing baseband data (e.g., web data, email, or interactive video game data) from the processor (340). The TX processing circuit (315) can encode, multiplex, or digitize the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver (310) can receive the outgoing processed baseband or IF signal from the TX processing circuit (315) and upconvert the baseband or IF signal into an RF signal transmitted through the antenna (305).

[0080] The processor (340) may include at least one processor or processing device and may execute an OS program (361) stored in memory (360) to control the overall operation of the terminal (116). For example, the processor (340) may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceiver (310), the RX processing circuit (325), and the TX processing circuit (315). In one embodiment, the processor (340) may include at least one microprocessor or microcontroller.

[0081] The processor (340) may execute other processors included in memory (360) or programs stored in memory (360) for operations such as measuring and reporting channel quality for a system having a two-dimensional (2D) antenna array. The processor (340) may move data into or out of memory (360). In one embodiment, the processor (340) may execute an application (362) based on an OS program (361) or in response to a signal received from a base station. The processor (340) may be coupled to an I / O interface (345) that allows the terminal (116) to connect to other devices such as a laptop or a portable computer. The I / O interface (345) may serve as a communication path between various accessories and the processor (340).

[0082] The processor (340) may be coupled to an input device (350) or a display (355). The terminal (116) may receive data through various input devices (350). The display (355) may include various display devices, such as a liquid crystal display capable of rendering text or graphics from a website, for example. The memory (360) may be coupled to the processor (340). The memory (360) may include at least one of Random Access Memory (RAM), flash memory, or read-only memory (ROM).

[0083] Meanwhile, the terminal (116) illustrated in FIG. 3a is merely an example, and the terminal (116) according to one embodiment of the present disclosure may be modified in various ways from the form illustrated in FIG. 3a. For example, the various components illustrated in FIG. 3a may be combined, subdivided, or omitted, and additional components may be added according to specific requirements. For example, the processor (340) included in the terminal (116) may include a plurality of processors, such as at least one CPU (Central Processing Unit) and at least one GPU (Graphics Processing Unit). The terminal (116) illustrated in FIG. 3a may be implemented as a mobile phone or a smartphone, but may also be implemented as various types of mobile or stationary devices, not limited thereto.

[0084] FIG. 3b is a drawing illustrating a base station (BS) (102) according to one embodiment of the present disclosure.

[0085] The base station of FIG. 3b may be represented as a BS or gNB. The base station (102) illustrated in FIG. 3b may correspond to at least one of the first base station (101), the second base station (102), or the third base station (103) of FIG. 1. A base station according to one embodiment of the present disclosure may be provided in various configurations and is not limited to the exemplary base station (102) illustrated in FIG. 3b.

[0086] Referring to FIG. 3b, the base station (102) may include at least one antenna (370a, 370b, ..., 370n), at least one RF transceiver (372a, 372b, ..., 372n), a TX processing circuit (374), and an RX processing circuit (376). In one embodiment, at least one antenna (370a, 370b, ..., 370n) may include a two-dimensional (2D) antenna array. The base station (102) may also include a controller or processor (378), a memory (380), and a backhaul / network interface (IF) (382).

[0087] At least one RF transceiver (372a, 372b, ..., 372n) can receive an incoming RF signal, such as a signal transmitted by a terminal or another base station, from at least one antenna (370a, 370b, ..., 370n). The RF transceiver (372a, 372b, ..., 372n) can down-convert the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to an RX processing circuit (376), and the RX processing circuit (376) can generate processed baseband signals by filtering, decoding, or digitizing the baseband or IF signals. The RX processing circuit (376) can transmit the processed baseband signal to a processor (378) for further processing.

[0088] The TX processing circuit (374) can receive analog or digital data (e.g., voice data, web data, email, or interactive video game data) from the processor (378). The TX processing circuit (374) can generate a processed baseband or IF signal by encoding, multiplexing, and / or digitizing outgoing baseband data. RF transceivers (372a, 372b, ..., 372n) can receive the outgoing processed baseband or IF signal from the TX processing circuit (374) and upconvert the baseband or IF signal into RF signals transmitted through the antenna (370a, 370b, ..., 370n).

[0089] The processor (378) may include at least one processor or processing device and may control the overall operation of the base station (102). For example, the processor (378) may control the reception of forward channel signals and the transmission of reverse channel signals by RF transceivers (372a, 372b, ..., 372n), an RX processing circuit (376), and a TX processing circuit (374). In one embodiment, the processor (378) may also support additional functions, such as advanced wireless communication functions. For example, the processor (378) may perform a BIS process performed by a Blind Interference Sensing (BIS) algorithm and decode a received signal that has been subtracted by interference signals. Various other functions may be supported by the processor (378) in the base station (102). In one embodiment, the processor (378) may include at least one microprocessor or microcontroller.

[0090] The processor (378) can also execute programs or other operations stored in memory (380), such as an operating system (OS). The processor (378) can support operations such as measuring and reporting channel quality for systems having a two-dimensional (2D) antenna array. In one embodiment, the processor (378) can support communication between network entities, such as Web RTC (real-time communication). The processor (378) can move data into or out of memory (380).

[0091] The processor (378) may be coupled to a backhaul / network IF (382). The backhaul / network IF (382) enables the base station (102) to communicate with other devices via a backhaul connection or via a network. The backhaul / network IF (382) may support communication via various wired or wireless connections. For example, when the base station (102) is implemented as part of a wireless communication system (e.g., 5G, LTE, or LTE-A), the backhaul / network IF (382) enables the base station (102) to communicate with other base stations via a wired or wireless backhaul connection. When the base station (102) is implemented as an access point, the backhaul / network IF (382) may enable the base station (102) to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (e.g., the Internet). The backhaul / network IF (382) may include various structures that support communications via wired or wireless connections, such as Ethernet or RF transceivers.

[0092] The memory (380) may be coupled to the processor (378). The memory (380) may include at least one of RAM, flash memory, or ROM. In one embodiment, instructions such as a BIS algorithm may be stored in the memory (380). The instructions stored in the memory (380) may be configured so that the processor (378) performs a BIS process and decodes a received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0093] As described in detail below, the data transmission path and data reception path of the base station (102) can support communication with an aggregation of FDD (frequency division duplex) cells and TDD (time division duplex) cells. The data transmission path and data reception path of the base station (102) can be implemented through RF transceivers (372a, 372b, ..., 372n), a TX processing circuit (374), and an RX processing circuit (376).

[0094] Meanwhile, the base station (102) illustrated in FIG. 3b is merely an example, and the base station (102) according to one embodiment of the present disclosure may be modified in various ways from the form illustrated in FIG. 3b. For example, the various components illustrated in FIG. 3b may be combined, subdivided, or omitted, and additional components may be added according to specific requirements. For example, the base station (102) as an access point may include a plurality of backhaul / network IFs (382), and the processor (378) may support a routing function for routing data between different network addresses. Referring to FIG. 3b, the TX processing circuit (374) and the RX processing circuit (376) are each illustrated as being configured as a single instance, but the base station (102) may each include a plurality of instances of the TX processing circuit (374) and the RX processing circuit (376). (For example, one TX processing circuit (374) and one RX processing circuit (376) per RF transceiver)

[0095] FIG. 4 is a diagram illustrating a cross-polarized multiple input multiple output (MIMO) antenna system according to one embodiment of the present disclosure.

[0096] In a MIMO antenna system, a base station or a terminal may each include multiple antennas. MIMO antenna systems are widely adopted in wireless communication systems due to their advantages in spatial multiplexing, diversity gain, and array gain.

[0097] Referring to FIG. 4, a MIMO antenna system may include, for example, 48 antenna elements. Referring to FIG. 4, four cross-polarized antenna elements (401) may form a 4x1 sub-array (402). The 12 sub-arrays may form a 2V3H MIMO antenna configuration consisting of two sub-arrays (404) in the vertical dimension and three sub-arrays (403) in the horizontal dimension. FIG. 4 illustrates one example of a MIMO antenna configuration, and various configurations may be applied to the antenna configuration according to one embodiment of the present disclosure.

[0098] In a MIMO antenna system, when a base station requests channel state information (CSI), it is required that the signal from the base station be received at the terminal at maximum possible received power and minimum possible interference. For each TDD system and FDD system, CSI acquisition at the base station can be achieved through measurement from the uplink reference signal at the base station or through measurement and feedback from the downlink reference signal by the terminal. For example, in an FDD system of a 5G network, the channel state information reference signal (CSI-RS) may be the primary reference signal used by the terminal in the operation of measuring and reporting CSI.

[0099] FIG. 5 is a diagram illustrating CSI-RS resource mapping in an orthogonal frequency division multiple access (OFDM) time-frequency grid according to one embodiment of the present disclosure.

[0100] In one embodiment, the terminal may receive configuration signaling for CSI-RS from the base station that can be used to measure channel state information. An exemplary embodiment of the configuration for CSI-RS is illustrated in FIG. 5.

[0101] Referring to FIG. 5, 12 antenna ports (CSI-RS ports) can be mapped to CSI-RS having three code domain multiplexing (CDM) groups. Each CDM group (CDM group 0, CDM group 1, and CDM group 2) can be mapped to four resource elements (REs) in an OFDM time-frequency grid. Antenna ports mapped to the same CDM group can be orthogonalized in the code domain by using an orthogonal cover code.

[0102] Referring to FIG. 5, the CSI-RS configuration can be associated with the MIMO antenna configuration illustrated in FIG. 4 by mapping the CSI-RS port to one of the cross-polarized antenna elements of the sub-array. In the 5G NR standard, three time-domain CSI-RS resource configurations are possible: periodic, semi-persistent, and aperioditic configurations. Referring to FIG. 5, an example of a periodic configuration having four slots of periodicity is illustrated.

[0103] In one embodiment, a base station may configure a terminal via upper-layer signaling using information for CSI feedback, which includes a spatial channel information indicator and other additional information to assist the base station in acquiring accurate CSI. In 4G or 5G standards, the spatial channel indicator reported via a precoding matrix indicator (PMI) may include a single or multiple channel matrices, channel covariance matrices, eigenvectors, or spatial sampling basis vectors. In particular, in 4G or 5G standards, the spatial channel information may be given by a single or multiple DFT basis vectors.

[0104] FIGS. 6a to 6c are drawings for illustrating multi-user scheduling in a multi-user (MU) MIMO communication system according to one embodiment of the present disclosure.

[0105] As described above in Fig. 5, each terminal can estimate the downlink channel through the CSI-RS transmitted from the base station, quantize it, and report CSI feedback to the base station. For example, the base station can set the CSI-ReportConfig field as shown in Fig. 8 through the RRC (radio resource control) message, which is an upper layer parameter, to the terminal as shown in [Table 1], and can indicate the type of CSI feedback information through the reportQuantity setting, which is one of the information elements (IE).

[0106] [Table 1]

[0107]

[0108] In particular, when reportQuantity is set to a parameter including PMI and a channel quality indicator (CQI), the terminal can report the channel quality (e.g., magnitude) through the CQI and the direction of the downlink channel vector through the PMI. The base station can perform multi-user scheduling and design a precoder based on feedback information received from the terminal.

[0109] Referring to FIG. 6a, a base station (102) transmits CSI-RS to a plurality of terminals (116-1, 116-2, 116-3), and each terminal (116-1, 116-2, 116-3) estimates a channel based on the received CSI-RS and obtains CSI feedback (report) information based on the estimated channel. The CSI feedback information may include a rank indicator (RI), PMI, and CQI.

[0110] RI represents the transmission rank estimated by the terminal as appropriate, i.e., the appropriate downlink transport layer NL; PMI represents the precoder matrix estimated by the terminal as appropriate for the selected rank situation; and CQI represents the channel coding rate and modulation technique estimated as appropriate when using the precoder matrix selected by the terminal. A PMI value refers to a specific precoder matrix, and a set of PMI values ​​represents a set of precoder matrices, which becomes the precoder codebook.

[0111] For example, the first terminal (116-1) can estimate a matrix H1 for the downlink channel between the base station (102) and the first terminal (116-1) based on the CSI-RS received from the base station (102), quantize H1 to obtain a precoder matrix W1 and a channel quality indicator CQI1, and transmit CSI feedback to the base station (102). Additionally, the second terminal (116-2) can estimate a matrix H2 for the downlink channel between the base station (102) and the second terminal (116-2) based on the CSI-RS received from the base station (102), quantize H2 to obtain a precoder matrix W2 and a channel quality indicator CQI2, and transmit CSI feedback to the base station (102). Likewise, the third terminal (116-3) can estimate a matrix H3 for the downlink channel between the base station (102) and the third terminal (116-3) based on the CSI-RS received from the base station (102), quantize H3 to obtain a precoder matrix W3 and a channel quality indicator CQI3, and transmit CSI feedback to the base station (102).

[0112] Referring to FIG. 6b, the base station (102) can perform MU scheduling for a plurality of terminals based on CSI feedback (W1 to W3, and CQI1 to CQI3) received from a plurality of terminals (116-1, 116-2, 116-3). Based on the MU scheduling result, the base station (102) transmits a precoded downlink signal to each of the scheduled terminals using a precoder matrix selected for each of the scheduled terminals. At this time, the MU scheduling can be performed by the processor (378) of FIG. 3b.

[0113] The precoder matrices selected by the base station (102) may not necessarily be the same as the precoder matrices reported by the terminal. In NR, the downlink physical channel has its own DM (demodulation)-RS for coherent demodulation, and the terminal assumes that the DM-RS is precoded in the same way as the data. As a result, any downlink multi-antenna precoding is transparent to the terminal, and theoretically, the base station (102) may apply any transmission precoding without needing to inform the terminal of the selected precoder.

[0114] In general, the base station (102) selects a precoder reported by the terminal (116); however, if another precoder is better, the base station may select a different precoder. For example, in multi-user MIMO (MU-MIMO), the base station can simultaneously make downlink transmissions to multiple terminals (users) using the same time-frequency resources. In MU-MUMO, the base station may select a precoding matrix that can concentrate energy on the terminal to be transmitted to while suppressing interference to simultaneous users (terminals). In this case, the precoding matrix used by the base station (102) for transmission to a specific terminal must be selected by comprehensively considering information on the downlink channel for that terminal as well as information on the downlink channel for other terminals. In 5G NR, various types of codebooks are defined, such as Type I CSI codebook, Type II CSI codebook, enhanced Type II CSI codebook, and further enhanced Type II CSI codebook. Although Type II CSI codebooks are designed with MU-MIMO scenarios in mind, many commercial 5G terminals support only Type I codebooks and do not support codebooks higher than rel-16. Additionally, as Type I codebooks designed for 32 ports are expanded to 128 ports, it is expected that PMI reporting methods based on Type I codebooks will continue to be used or their use will expand further.

[0115] Type I codebooks are configured based on DFT beams and are characterized by the presence of many mutually orthogonal vector pairs within the precoding matrix. For example, when using 32-port CSI-RS, the number of possible Rank 1 Type I PMIs is 1024, and among them, the number of Rank 1 Type I PMIs orthogonal to any given precoding matrix is ​​499, resulting in a probability of mutual orthogonality of approximately 50%. This characteristic of having many orthogonal vector pairs within the codebook makes it difficult for the base station to incorrectly determine that there is no interference between terminals during MU scheduling, or to determine the superiority or inferiority between terminals based on such interference. Consequently, the performance of MU scheduling based on Type I codebooks may be degraded due to the characteristic of having many orthogonal vector pairs within the codebook.

[0116] FIG. 6c illustrates a case where the performance of Type I codebook-based MU scheduling degrades. Referring to FIG. 6c, the first terminal (116-1, UE1) estimates the matrix H for the downlink channel as H1, selects W1 using the Type I codebook-based precoder matrix, and reports it to the base station. Additionally, the second terminal (116-2) estimates the matrix H for the downlink channel as H2, selects W2 using the Type I codebook-based precoder matrix, and reports it to the base station.

[0117] The interference from the second terminal (116-2) received by the first terminal (116-1) is It can be represented as follows. Even if there is actual reception interference between terminals, if W1 and W2 are orthogonal, the base station estimates that there is no multi-user interference (MUI) between the first terminal (116-1) and the second terminal (116-2) during MU scheduling, and this results in a difference between the base station's estimated performance and actual performance.

[0118] According to one embodiment of the present disclosure, when an MUI exists, the first terminal (116-1) is of the size of the MUI from the nth terminal (116-n). It can be reported to a base station. According to one embodiment of the present disclosure, the base station (102) can transmit setting information for MUI acquisition and reporting to the terminal (116) via an upper layer parameter setting method (e.g., RRC), and transmission performance can be improved through MU scheduling and link adaptation improvement based on the information acquired through MUI reporting.

[0119] FIGS. 7a and 7b are drawings for illustrating MUI measurement settings and MUI reporting procedures according to one embodiment of the present disclosure.

[0120] <Verify the device's MUI reporting capability>

[0121] Before instructing the terminal (116) to measure and report the MUI, the base station (102) can determine whether the terminal (116) can calculate and report MUI-related information. The base station (102) can obtain terminal capability information related to the terminal's MUI reporting based on a terminal capability (UE capability) verification mechanism defined in the standard.

[0122] As described in 3GPP TS38.331, the base station (102) can transmit a UE Capability Enquiry to the terminal (116) and receive terminal capability information from the terminal (116). According to one embodiment of the present disclosure, by adding new parameters such as those in [Table 2] within the Phy-Parameters of the UE radio access capability described in 3GPP TS38.306, the base station (102) can instruct the terminal (116) to report terminal capability related to MUI reporting.

[0123] [Table 2]

[0124]

[0125] In [Table 2], csi-ReportMui is information indicating whether the terminal supports MUI reporting, and maxSizeofMuiPmiList indicates the maximum number of PMIs that can be set in the MUI-PMI list. The MUI-PMI list according to one embodiment of the present disclosure is a list of PMIs for which the terminal must measure MUI, and specific details will be described later.

[0126] If, as a result of checking the terminal capability, the terminal (116) is unable to calculate and report MUI-related information, the base station may not set up MUI measurement / reporting or disable MUI measurement / reporting.

[0127] Referring to FIG. 7a, in step 710, the base station (102) can transmit parameter settings related to MUI measurement or MUI reporting to the terminal (116).

[0128] The parameters related to MUI measurement or MUI reporting that the base station (102) sets to the terminal (116) through upper layer signaling may include the following information.

[0129] a) Whether MUI reporting is enabled

[0130] b) MUI Reporting Method (Periodic / Aperiodic) and Reporting Period

[0131] c) Method of transmitting the list of MUI-PMI that the terminal needs to measure

[0132] d) MUI information that the terminal must calculate

[0133] e) Method for reporting MUI of the terminal

[0134] f) MUI information that the terminal must report

[0135] The information included in the parameters related to MUI measurement or MUI reporting, and the specific method for transmitting the information, will be described below.

[0136] In step 720, the base station (102) can transmit DCI (downlink control information) or MAC (medium access control) CE (control element) to the terminal (116) for instructions related to MUI measurement or MUI reporting.

[0137] DCI or MAC CE can dynamically provide instructions related to MUI measurement or MUI reporting compared to semi-static settings such as RRC. For example, if non-periodic MUI reporting is set via an RRC message, the terminal (116) can transmit MUI reporting to the base station (102) only when a DCI containing an MUI reporting instruction field is received.

[0138] In step 730, the base station (102) can transmit RS for MUI measurement to the terminal (116) after transmitting parameter settings related to MUI measurement / reporting.

[0139] RS is a predetermined signal between a base station (102) and a terminal (116) that occupies a specific resource element on the downlink time-frequency, and the standard defines CSI-RS, DM-RS, PT (phase tracking)-RS, TRS (tracking reference signal), SRS (sounding reference signal), and PRS (positioning reference signal), etc. The MUI measurement and reporting method according to one embodiment of the present disclosure may be applied by extending the CSI setting and reporting method defined in the standard, and the MUI-RS, which is the RS for MUI measurement, may be CSI-RS.

[0140] In step 740, the terminal (116) that receives the RS for MUI measurement can obtain the MUI based on the MUI measurement related settings and the MUI-RS.

[0141] The terminal (116) can measure the MUI based on the MUI measurement related settings and the RS for MUI measurement received through upper layer signaling or DCI or MAC CE. For example, the terminal (116) can determine the value to be measured as MUI based on the MUI report quantity according to the MUI-ReportConfig and acquire the MUI based on the determination.

[0142] In step 750, the terminal (116) that has acquired the MUI can transmit the MUI report to the base station (102).

[0143] According to one embodiment of the present disclosure, a terminal (116) may transmit an MUI report using uplink control information (UCI), and the MUI report may be included in and transmitted together with a CSI report. Additionally, the MUI report may be transmitted periodically or non-periodically as set; if set periodically, the MUI report may be transmitted at a frequency that is an integer multiple of the CSI report, and if set non-periodically, the MUI report may be transmitted according to DCI or MAC CE instructions.

[0144] Hereinafter, according to one embodiment of the present disclosure, a method for a base station (102) to set and instruct a terminal (116) to calculate and report an MUI is described.

[0145] According to one embodiment of the present disclosure, an MUI-Report Config can be added to an RRC message as shown in [Table 4], and a new field, muiReporting, can be added to the CSI-ReportConfig that directs CSI reporting-related operations as shown in [Table 3] to instruct the terminal.

[0146] <a. 단말의 MUI 보고 여부 및 b. MUI 보고 방식 / 주기 설정>

[0147] When muiReporting is set to disable, the terminal (116) is instructed not to perform MUI-related operations. When muiReporting is set to enable, the terminal (116) is instructed to perform MUI-related operations and can operate by referring to the MUI-ReportConfig field corresponding to the MUI-ReportConfigID of [Table 4] that is set together.

[0148] [Table 3]

[0149]

[0150] [Table 4]

[0151]

[0152] As previously mentioned, 5G NR defines procedures for CSI measurement and CSI reporting. MUI measurement and MUI reporting according to one embodiment of the present disclosure may be performed together with or in conjunction with the CSI measurement and CSI reporting procedures.

[0153] Referring to FIG. 7b, in step 711, the terminal (116) can receive an RRC message related to CSI measurement and reporting from the base station (102).

[0154] [Table 5] shows a CSI reporting setting including an MUI reporting setting according to one embodiment of the present disclosure. Referring to [Table 5], an RRC message may include CSI reporting setting information including setting information indicating whether to report an MUI. Additionally, the RRC message may include at least one of the following as an MUI measurement / reporting setting: reporting type (method) information, a list of PMIs to be measured for MUI, information to be measured (calculated), a reporting method, and an amount (type) of information to be reported. In [Table 5], 'table' of the reporting method refers to a method of quantizing MUI results and reporting them to a pre-defined table.

[0155] [Table 5]

[0156]

[0157] In step 721, the terminal (116) can receive DCI or MAC CE related to CSI measurement / report and MUI measurement / report from the base station (102).

[0158] According to one embodiment of the present disclosure, a DCI or MAC CE may be received when instructions for MUI measurement / reporting are required. For example, when reportConfigType=aperiodic is set in MUI-ReportConfig of [Table 5], the terminal (116) may report MUI non-periodically and perform MUI reporting according to downlink commands via the DCI, etc.

[0159] [Table 6] shows a DCI including a control information field for MUI measurement / reporting according to one embodiment of the present disclosure. Referring to [Table 6], the DCI according to one embodiment of the present disclosure may include at least one of a CSI-MUI request information field, an MUI-PMI instruction information field, and an MUI-PMI setting identification information field. In this case, the CSI-MUI request information field refers to information instructing an MUI report obtained based on a CSI received by the terminal, the MUI-PMI instruction information refers to information instructing PMIs to measure MUI for the terminal's precoder matrix W obtained based on a channel H estimated based on the CSI, and the MUI-PMI setting identification information refers to identifier information for referencing setting information for MUI measurement and reporting.

[0160] [Table 6]

[0161]

[0162] [Table 7] indicates what information each parameter included in the RRC message of [Table 5] or the DCI / MAC CE fields of [Table 6] represents. muiReporting indicates whether MUI reporting is enabled or disabled, reportConfigType or CSI-MUI request indicates when MUI reporting should be performed, pmiListForMui or MUI-PMI indices (or Config Ids) indicates the PMI list (index) for which the terminal must measure MUI, muiReportQuantity indicates the type of information to be calculated for MUI, nrofmuiReport indicates the number of MUI reports, and table indicates the reporting method for reporting MUI to a pre-defined table.

[0163] [Table 7]

[0164]

[0165] The terminal (116) that obtained information for CSI reporting (or feedback) in step 731 can transmit the CSI report (751) to the base station (102) in step 751.

[0166] For example, a terminal (116) that receives CSI-RS from a base station (102) in step 731 can transmit (751) CSI report information determined based on the received CSI-RS to the base station (102). At this time, the CSI report information and the time of the CSI report can be determined based on the configuration information for the CSI report received (711) via an RRC message.

[0167] According to one embodiment of the present disclosure, the MUI report can be included as an MUI information field in the CSI report as shown in [Table 8] and transmitted together with the CSI report.

[0168] [Table 8]

[0169]

[0170] FIGS. 8a to 8d are drawings illustrating a specific method for setting up an MUI report according to one embodiment of the present disclosure.

[0171] According to one embodiment of the present disclosure, if MUI reporting is configured not to be performed by upper layer signaling, the terminal may not transmit MUI reporting. Referring to FIG. 8a, when muiReporting is set to disable, the terminal (116) transmits only CSI reporting and does not transmit separate MUI reporting.

[0172] According to one embodiment of the present disclosure, when MUI reporting is configured to be transmitted by upper layer signaling, identification information for the MUI reporting setting must be configured together, and the terminal can transmit the MUI reporting by referring to the identified MUI reporting setting. For example, when muiReporting is enabled, an MUI-ReportConfig ID is configured together, and the terminal (116) refers to the MUI-ReportConfig based on the MUI-ReportConfig ID.

[0173] The base station can set and instruct the terminal on the MUI reporting time using the reportConfigType field within MUI-ReportConfig as shown in [Table 9].

[0174] [Table 9]

[0175]

[0176] According to one embodiment of the present disclosure, when the CSI report is set to 'periodic', the MUI reportConfigType can be set to 'periodic' to transmit the MUI report more efficiently, and the MUI report period (INTEGER) can be set to an integer (n) times the CSI report period. If the set MUI report period is the same as the CSI report period (n=1), the MUI report can be transmitted with every CSI report as shown in FIG. 8b. Alternatively, if the set MUI report period is longer than the CSI report period (n>1), it can be transmitted once in a period for every n CSI reports. FIG. 8c shows the case where n=2, in which the MUI report is transmitted once in a period for every two CSI reports.

[0177] According to one embodiment of the present disclosure, when the MUI reportConfigType is set to 'aperiodic', the terminal can perform an MUI report in accordance with a downlink command received from DCI, etc., as shown in FIG. 8d.

[0178] According to one embodiment of the present disclosure, a base station may add an MUI request field to a DCI (e.g., DCI format 0_1) as shown in [Table 10] to instruct a terminal to an MUI-ReportConfig ID, and the terminal may report an MUI by referring to the MUI-ReportConfig.

[0179] [Table 10]

[0180]

[0181] <c. MUI-PMI 리스트 전달 방법>

[0182] In the following, according to one embodiment of the present disclosure, a method is disclosed in which a base station transmits a PMI list to a terminal to measure MUI.

[0183] FIGS. 9a and 9b are drawings for illustrating a method of transmitting an MUI-PMI list to be measured by a terminal according to one embodiment of the present disclosure.

[0184] According to one embodiment of the present disclosure, a base station can set candidate PMIs for which a terminal must measure MUI via an RRC message. Referring to FIG. 9a, the base station can set (910) a list of MUI-PMIs, [PMI1, PMI2, ..., PMIN], for which the terminal must measure via an RRC message to the terminal. At this time, it is assumed that the MUI reportConfigType is set to 'periodic' and the CSI reporting period and the MUI reporting period are the same.

[0185] The MUI-PMI list refers to a list of PMIs for which MUI must be measured for the terminal's precoder matrix W, which is obtained based on the channel H estimated based on CSI. According to one embodiment of the present disclosure, MUI-PMI list information (pmiListForMui) containing index information for each PMI is included in MUI-ReportConfig as shown in [Table 11], so that the terminal can set the PMI list for which MUI must be measured. The indices i1_n and i2_n indicated in pmiListForMui of [Table 11] represent specific PMIn, and the method of representing PMI indices in existing 5G / NR can be used.

[0186] [Table 11]

[0187]

[0188] According to one embodiment of the present disclosure, as shown in [Table 12], MUI-ReportConfig includes identification information (MUI-PMI-listConfig Id) for each MUI-PMI list setting, and the terminal can obtain the corresponding MUI-PMI list setting information (MUI-PMI-listConfig) by referring to the identification information and using the identification information (Id1, Id2, ...) of the MUI-PMI list setting information (MUI-PMI-listConfig) corresponding to the identification information (MUI-PMI-listConfig Id) for the MUI-PMI list setting among the MUI-PMI list setting information (MUI-PMI-listConfig) in [Table 13].

[0189] [Table 12]

[0190]

[0191] [Table 13]

[0192]

[0193] When CSI-RS is received (920, 921) from the base station (102), the terminal (116) estimates a downlink channel H based on the CSI-RS and selects a precoder matrix W suitable for the estimated downlink channel H. Additionally, the terminal (116) reports to the base station (930, 931) the MUI values ​​(f(PMIn, H, W)) calculated for the PMIs in the MUI-PMI list [PMI1, PMI2, ..., PMIN] that are RRC-configured from the base station.

[0194] According to one embodiment of the present disclosure, a base station can dynamically instruct a terminal to measure a list of MUI-PMIs through a command such as DCI / MAC CE.

[0195] Referring to FIG. 9b, the base station can set (960) the MUI-PMI list [PMI1, PMI2, ..., PMIN] that the terminal must measure via DCI to the terminal. At this time, it is assumed that the MUI is set to be reported non-periodically (MUI reportConfigType='aperiodic').

[0196] According to one embodiment of the present disclosure, the received DCI may include a field (MUI-PMI indices) related to index information for each PMI in the MUI-ReportConfig as shown in [Table 14]. Indices i1_n and i2_n within the MUI-PMI indices field of [Table 14] represent specific PMIn, and the method of representing PMI indices in existing 5G / NR can be used.

[0197] [Table 14]

[0198]

[0199] According to one embodiment of the present disclosure, the received DCI includes fields related to identification information (MUI-PMI Config IDs) for MUI-PMI list settings as shown in [Table 15], and the terminal can obtain the corresponding MUI-PMI list setting information (MUI-PMI-listConfig) through the identification information (Id1, ..., IdN) of the MUI-PMI list setting information (MUI-PMI-listConfig) corresponding to the identification information (MUI-PMI-listConfig Id) for MUI-PMI list settings among the MUI-PMI list setting information (MUI-PMI-listConfig) in [Table 16] by referring to the identification information.

[0200] [Table 15]

[0201]

[0202] [Table 16]

[0203]

[0204] Although not illustrated in the drawings, if the MUI is configured to report non-periodically, the PMI-MUI list may be indicated via MAC CE.

[0205] Likewise, although not illustrated in the drawing, if the MUI is configured to report non-periodically, the PMI-MUI list is set via an RRC message, and the timing of the MUI report may be instructed to the terminal via a downlink command of the DCI / MAC CE.

[0206] <d. 단말이 계산해야 할 MUI 정보를 설정하는 방법>

[0207] In the following, according to one embodiment of the present disclosure, a method is disclosed in which a base station sets values ​​to be calculated and values ​​to be reported to a terminal in relation to the MUI.

[0208] The base station must instruct the terminal on what values ​​to calculate and report for the candidate PMIs for which the MUI is to be calculated.

[0209] According to one embodiment of the present disclosure, a base station can instruct what values ​​to calculate and report for MUI measurement by creating a muiReportQuantity field within the MUI-ReportConfig of an RRC message as shown in [Table 17].

[0210] [Table 17]

[0211]

[0212] In [Table 17], when muiReportQuantity is set as the index, the terminal is the magnitude of interference caused by PMIn included in the MUI-PMI list It calculates and can report as many indexes as the number set according to the nrofmuiReport setting, which is the number of MUIs to report.

[0213] In [Table 17], when muiReportQuantity is set to a quantity other than the index, each meaning is as in [Table 18].

[0214] When muiReportQuantity is set to index-sinrLoss, the terminal represents the difference between SINR1, which is the received SINR when the effective downlink channel (effective PDSCH) is HW, and SINR2, which is the received SINR when the effective downlink channel is HW and the MUI HP1 exists.

[0215] When muiReportQuantity is set to index-cqiLoss, the terminal refers to the difference between CQI1, the CQI corresponding to SINR1, and CQI2, the CQI corresponding to SINR2.

[0216] When muiReportQuantity is set to index-muiSNR, it represents the received SNR when the effective downlink channel is HP1, indicating the interference magnitude.

[0217] [Table 18]

[0218]

[0219] <e. 단말의 MUI 보고 방법 설정>

[0220] In the following, a method for a base station to set an MUI reporting method to a terminal is disclosed according to one embodiment of the present disclosure.

[0221] When MUI reporting is set or instructed by the base station, the terminal can estimate the downlink channel based on the CSI-RS received from the base station, determine the PMI to be applied to the terminal based on the estimated channel, and calculate the MUI corresponding to the reportQuantity set by the base station. At this time, if the reportQuantity is set to index-sinrLoss, index-cqiLoss, or index-muiSNR as shown in [Table 18], each calculation result is a scalar value, so quantization may be required when reporting it to the base station.

[0222] The base station can report the MUI through a pre-defined table setting in the MUI-ReportConfig field as shown in [Table 19] for quantization of the calculation result of the MUI corresponding to reportQuantity.

[0223] Looking at [Table 19], pre-defined tables for sinrLoss, cqiLoss, and muiSnr are added within the MUI-ReportConfig field, and [Tables 20] through [Table 22] show examples of pre-defined tables for sinrLoss, cqiLoss, and muiSnr, respectively.

[0224] [Table 19]

[0225]

[0226] [Table 20]

[0227]

[0228] [Table 21]

[0229]

[0230] [Table 22]

[0231]

[0232] <f. 단말이 보고할 MUI 정보 설정>

[0233] In the following, a method for setting MUI information to be reported by a terminal to a base station is disclosed according to one embodiment of the present disclosure.

[0234] The base station may indicate whether the terminal should selectively report at least one MUI among the PMIs instructed by the MUI-PMI list. That is, the terminal may selectively report only some of the N MUIs for [PMI1, PMI2, ..., PMIN].

[0235] [Table 23] shows a method for setting information to be reported by a terminal by adding an nrofmuiReport field within MUI-ReportConfig according to one embodiment of the present disclosure.

[0236] [Table 23]

[0237]

[0238] FIGS. 10a to 10b are drawings for explaining a method of selecting and transmitting MUI information according to a setting, in accordance with one embodiment of the present disclosure.

[0239] When the nrofmuiReport field is set to {best M}, the terminal reports the index and MUI values ​​corresponding to the best M PMI among the N PMIs in the MUI-PMI list. The best M PMI may refer to the M PMIs that are estimated to have a small MUI when applied to other terminals in relation to the precoder matrix W to be applied to the terminal. In other words, it is information indicating the selection priority among the PMIs to be selected for MU scheduling.

[0240] When the nrofmuiReport field is set to {worst M}, the terminal reports the index and MUI values ​​corresponding to the worst M PMI among the N PMIs in the MUI-PMI list. The worst M PMI may refer to the M PMIs that are estimated to have a large MUI when applied to other terminals in relation to the precoder matrix W to be applied to the terminal. In other words, it is information indicating the avoidance priority among the PMIs to be selected for MU scheduling.

[0241] Figure 10a assumes that the nrofmuiReport field is set to {best 2}. Referring to Figure 10a, the terminal receives CSI-RS (1010), calculates MUIs for the MUI-PMI list based on the received CSI-RS, and can transmit MUI values ​​X3 for the smallest PMI3 among the MUIs and MUI X1 for the second smallest PMI1 as MUI reports along with the CSI report (1020).

[0242] If the nrofmuiReport field is set to {roundrobin M}, the terminal sequentially measures and reports M PMIs out of N PMIs in the MUI-PMI list during each cycle. This round robin method is applicable when MUI reporting is performed periodically.

[0243] In FIG. 10b, it is assumed that the nrofmuiReport field is set to {roundrobin 2}. Referring to FIG. 10b, the terminal receives CSI-RS (1050) in the first cycle and, based on the received CSI-RS, calculates the MUI, X1, and X2 for PMI1 and PMI2 in order among the MUI-PMI lists and transmits them as an MUI report along with the CSI report (1060). Subsequently, the terminal receives CSI-RS (1070) in the second cycle and, based on the received CSI-RS, calculates the MUI, X3, and X4 for PMI3 and PMI4 in order among the MUI-PMI lists and transmits them as an MUI report along with the CSI report (1080).

[0244] In the following, a method for a terminal to report MUI information is disclosed according to one embodiment of the present disclosure.

[0245] The terminal can report MUI via uplink signaling. When configured to report MUI by the base station, the terminal estimates the downlink channel via CSI-RS, calculates the MUI for the PMIs based on the estimated channel, and reports it to the base station.

[0246] According to one embodiment of the present disclosure, MUI reports can be transmitted via uplink control information (UCI) by adding a mapping rule for MUI reporting to a CSI reporting mapping rule. [Table 24] discloses a UCI bit sequence including a CSI report number field, and [Table 25] discloses a CSI field corresponding to the CSI report number. By adding an MUI information field to the CSI field as disclosed in [Table 25], the terminal can transmit MUI information along with the CSI report to the base station using the UCI.

[0247] [Table 24]

[0248]

[0249] [Table 25]

[0250]

[0251] FIG. 11 is a flowchart of a method for a terminal to report an MUI to a base station according to one embodiment of the present disclosure.

[0252] Referring to FIG. 11, in step 1110, the terminal (116) can receive configuration information related to MUI reporting from the base station (102).

[0253] Configuration information related to MUI reporting according to one embodiment of the present disclosure may be received through upper layer signaling transmitted by a base station (102), and the configuration information related to MUI reporting may include information on whether MUI reporting is enabled, information on the MUI reporting method (periodic / aperiodic) and reporting period, information on a method for transmitting an MUI-PMI list to be measured by the terminal, information on the MUI to be calculated by the terminal, information on the MUI reporting method of the terminal, and MUI information to be reported by the terminal. According to one embodiment of the present disclosure, an MUI-PMI list to be measured by the terminal may be configured to the terminal through upper layer signaling.

[0254] Although not illustrated in the drawing, the terminal (116) may receive a request for terminal capability information from the base station (102) and transmit the terminal capability information to the base station (102) before receiving configuration information related to MUI reporting from the base station (102). The terminal capability information may include information indicating whether the terminal (116) can measure and report MUI.

[0255] Additionally, although not illustrated in the drawings, the terminal (116) may receive a DCI or MAC CE for instructions related to MUI measurement or MUI reporting from the base station (102) after receiving configuration information related to MUI reporting from the base station (102). For example, if non-periodic MUI reporting is configured through upper layer signaling, the terminal (116) may transmit the MUI report to the base station (102) when a DCI containing an MUI report instruction field is received. According to one embodiment of the present disclosure, a list of MUI-PMIs to be measured by the terminal may be received by the terminal as a DCI or MAC CE for instructions related to MUI measurement or MUI reporting.

[0256] In step 1120, the terminal (116) can receive an RS to obtain an MUI from the base station (102).

[0257] RS is a predetermined signal between the base station (102) and the terminal (116) that occupies a specific resource element on the downlink time-frequency, and the standard defines CSI-RS, DM-RS, PT-RS, TRS, SRS, and PRS, etc. The MUI measurement and reporting method according to one embodiment of the present disclosure may be applied by extending the CSI setting and reporting method defined in the standard, and the MUI-RS, which is the RS for MUI measurement, may be CSI-RS.

[0258] In step 1130, the terminal (116) can obtain multi-user interference based on configuration information and RS related to MUI reporting.

[0259] The terminal (116) can measure the MUI based on the MUI measurement related settings received through upper layer signaling or DCI or MAC CE and the RS for MUI measurement.

[0260] As described above, configuration information related to MUI reporting according to one embodiment of the present disclosure may include information on whether MUI reporting is enabled, information on the MUI reporting method (periodic / aperiodic) and reporting period, information on a method for transmitting a list of MUI-PMIs to be measured by the terminal, information on the MUI to be calculated by the terminal, information on the MUI reporting method of the terminal, and MUI information to be reported by the terminal. Accordingly, the terminal can obtain MUI values ​​to be included in the MUI report based on the received list of MUI-PMIs and information on the MUI to be calculated by the terminal. For example, the terminal (116) can determine a value to be measured as an MUI according to the MUI report quantity according to the MUI-ReportConfig and obtain an MUI based on the determination.

[0261] In step 1140, the terminal (116) can transmit the MUI report to the base station (102) based on configuration information related to the MUI report.

[0262] A terminal (116) according to one embodiment of the present disclosure may transmit an MUI report to a base station (102) based on the MUI reporting method and period included in the configuration information related to the MUI report, information regarding the terminal's MUI reporting method, and MUI information that the terminal is to report. For example, the terminal (116) may transmit the MUI report using uplink control information (UCI), and the MUI report may be included in the CSI report and transmitted together. Additionally, the MUI report may be transmitted periodically or non-periodically as configured; if configured periodically, the MUI report may be transmitted at a period that is an integer multiple of the CSI report, and if configured non-periodically, the MUI report may be transmitted according to the DCI or MAC CE instructions.

[0263] FIG. 12 is a flowchart of a method for a base station to receive an MUI report from a terminal according to one embodiment of the present disclosure.

[0264] Referring to FIG. 12, in step 1210, the base station (102) can transmit configuration information related to MUI reporting to the terminal (116).

[0265] A base station may transmit configuration information related to MUI reporting according to one embodiment of the present disclosure through upper layer signaling, and the configuration information related to MUI reporting may include information on whether MUI reporting is enabled, information on the MUI reporting method (periodic / aperiodic) and reporting period, information on a method for transmitting a list of MUI-PMIs to be measured by the terminal, information on the MUI to be calculated by the terminal, information on the terminal's MUI reporting method, and MUI information to be reported by the terminal. Additionally, the base station may set the list of MUI-PMIs to be measured by the terminal to the terminal through upper layer signaling.

[0266] Although not illustrated in the drawing, the base station (102) may transmit a request for terminal capability information to the terminal (116) and transmit terminal capability information from the terminal (116) before transmitting configuration information related to MUI reporting to the terminal (116). The terminal capability information may include information indicating whether the terminal (116) can measure and report MUI.

[0267] Additionally, although not illustrated in the drawings, the base station (102) may transmit a DCI or MAC CE for MUI measurement or MUI reporting related instructions to the terminal (116) after transmitting configuration information related to MUI reporting to the terminal (116). For example, if non-periodic MUI reporting is configured through upper layer signaling, the base station (102) may receive MUI reporting from the terminal (116) by transmitting a DCI containing an MUI reporting instruction field. According to one embodiment of the present disclosure, the base station (102) may transmit a list of MUI-PMIs that the terminal is to measure to the terminal (116) as a DCI or MAC CE for MUI measurement or MUI reporting related instructions.

[0268] In step 1220, the base station (102) can transmit an RS to the terminal (116) to obtain an MUI.

[0269] RS is a predetermined signal between the base station (102) and the terminal (116) that occupies a specific resource element on the downlink time-frequency, and the standard defines CSI-RS, DM-RS, PT-RS, TRS, SRS, and PRS, etc. The MUI measurement and reporting method according to one embodiment of the present disclosure may be applied by extending the CSI setting and reporting method defined in the standard, and the MUI-RS, which is the RS for MUI measurement, may be CSI-RS.

[0270] In step 1230, the base station (102) can receive an MUI report from the terminal (116).

[0271] A base station (102) according to one embodiment of the present disclosure may receive an MUI report from a terminal (116) based on the MUI reporting method and period included in the configuration information related to the MUI report, information on the terminal's MUI reporting method, and MUI information that the terminal is to report. For example, the terminal (116) may transmit the MUI report using uplink control information (UCI), and the MUI report may be included in the CSI report and transmitted together. Additionally, the MUI report may be transmitted periodically or non-periodically as configured; if configured periodically, the MUI report may be transmitted at a period that is an integer multiple of the CSI report, and if configured non-periodically, the MUI report may be transmitted according to the DCI or MAC CE instructions.

[0272] FIG. 13 is a block diagram schematically illustrating the configuration of a base station (1300) according to one embodiment of the present disclosure.

[0273] Referring to FIG. 13, a base station (1300) may be composed of a transceiver (1310), a processor (1320), and a memory (1330). Depending on the communication method of the base station (1300) described above, the transceiver (1310), the processor (1320), and the memory (1330) of the base station (1300) may operate. However, the components of the base station (1300) are not limited to the examples described above. For example, the base station (1300) may include more components or fewer components than the components described above. In one embodiment, the transceiver (1310), the processor (1320), and the memory (1330) may be implemented in the form of a single chip. Additionally, the processor (1320) may include one or more processors.

[0274] The transceiver unit (1310) is a collective term for the receiver unit of the base station (1300) and the transmitter unit of the base station (1300), and can transmit and receive signals with a terminal or network entity. The signals transmitted and received with the terminal or network entity may include control information and data. To this end, the transceiver unit (1310) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is one embodiment of the transceiver unit (1310), and the components of the transceiver unit (1310) are not limited to an RF transmitter and an RF receiver.

[0275] Additionally, the transceiver (1310) can perform functions for transmitting and receiving signals through a wireless channel. For example, the transceiver (1310) can receive a signal through a wireless channel and output it to a processor (1320), and transmit the signal output from the processor (1320) through a wireless channel.

[0276] The memory (1330) can store programs and data necessary for the operation of the base station (1300). Additionally, the memory (1330) can store control information or data included in signals acquired from the base station. The memory (1330) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1330) may not exist separately but may be configured to be included in the processor (1520). The memory (1330) may be composed of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. Furthermore, the memory (1530) can provide stored data upon the request of the processor (1320).

[0277] The processor (1320) can control a series of processes to enable the base station (1300) to operate according to the embodiments of the present disclosure described above. For example, the processor (1320) can receive control signals and data signals through the transceiver (1310) and process the received control signals and data signals. The processor (1320) can transmit the processed control signals and data signals through the transceiver (1310). Additionally, the processor (1320) can write or read data to or from the memory (1330). The processor (1320) can perform the functions of the protocol stack required by the communication standard. To this end, the processor (1320) may include at least one processor or microprocessor. In one embodiment, a part of the transceiver (1310) or the processor (1320) may be referred to as a communication processor (CP).

[0278] The processor (1320) may be composed of one or more processors. In this case, the one or more processors may be general-purpose processors such as CPUs, APs, and DSPs (Digital Signal Processors), graphics-dedicated processors such as GPUs and VPUs (Vision Processing Units), or artificial intelligence-dedicated processors such as NPUs. For example, if one or more processors are artificial intelligence-dedicated processors, the artificial intelligence-dedicated processors may be designed with a hardware structure specialized for processing a specific artificial intelligence model.

[0279] FIG. 14 is a block diagram schematically illustrating the configuration of a terminal (1400) according to one embodiment of the present disclosure.

[0280] Referring to FIG. 14, a terminal (1400) according to the present disclosure may be composed of a processor (1420), a memory (1430), and a transceiver (1410). However, the components of the terminal (1400) are not limited to the examples described above. For example, the terminal (1400) may include more components or fewer components than the components described above. In one embodiment, the processor (1420), the memory (1430), and the transceiver (1410) may be implemented in the form of a single chip.

[0281] The processor (1420) may be composed of one or more processors. In this case, the one or more processors may be general-purpose processors such as CPUs, APs, and DSPs (Digital Signal Processors), graphics-dedicated processors such as GPUs and VPUs (Vision Processing Units), or artificial intelligence-dedicated processors such as NPUs. For example, if one or more processors are artificial intelligence-dedicated processors, the artificial intelligence-dedicated processors may be designed with a hardware structure specialized for processing a specific artificial intelligence model.

[0282] The processor (1420) can control a series of processes to enable the terminal (1400) to operate according to the embodiments of the present disclosure described above. For example, the processor (1420) can receive control signals and data signals through the transceiver (1410) and process the received control signals and data signals. The processor (1420) can transmit the processed control signals and data signals through the transceiver (1410). In addition, the processor (1420) can control the processing of input data derived from the received control signals and data signals according to a predefined operation rule or artificial intelligence model stored in the memory (1430). The processor (1420) can write and read data from the memory (1430). Furthermore, the processor (1420) can perform the functions of a protocol stack required by a communication standard. According to one embodiment, the processor (1420) may include at least one processor. In one embodiment, a part of the transmitting and receiving unit (1410) or the processor (1420) may be referred to as a communication processor (CP).

[0283] The memory (1430) can store programs and data necessary for the operation of the terminal (1400). Additionally, the memory (1430) can store control information or data included in signals obtained from the terminal (1400). Additionally, the memory (1430) can store predefined operation rules or artificial intelligence models used in the terminal (1400). The memory (1430) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1430) may not exist separately but may be configured to be included in the processor (1420). The memory (1430) may be composed of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. The memory (1430) can provide stored data upon request from the processor (1420).

[0284] The transceiver (1410) is a collective term for the transceiver and the receiver, and the transceiver (1410) of the terminal (1400) can transmit and receive signals with a base station or a network entity. The signals transmitted and received may include control information and data. To this end, the transceiver (1410) may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is one embodiment of the transceiver (1410), and the components of the transceiver (1410) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (1410) can receive a signal through a wireless channel and output it to a processor (1420), and transmit the signal output from the processor (1420) through a wireless channel.

[0285] Various embodiments of the present disclosure may be implemented or supported by one or more computer programs, and computer programs may be formed from computer-readable program code and stored on a computer-readable medium. In the present disclosure, “application” and “program” may represent one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data, or parts thereof suitable for implementation in computer-readable program code. “Computer-readable program code” may include various types of computer code, including source code, object code, and executable code. “Computer-readable medium” may include various types of media accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive (HDD), compact disc (CD), digital video disc (DVD), or various types of memory.

[0286] Additionally, a device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, a 'non-transitory storage medium' is a tangible device and may exclude wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Meanwhile, this 'non-transitory storage medium' does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily. For example, a 'non-transitory storage medium' may include a buffer in which data is stored temporarily. A computer-readable medium may be any available medium accessible by a computer and may include both volatile and non-volatile media, as well as removable and non-removable media. A computer-readable medium includes media in which data can be stored permanently and media in which data can be stored and subsequently overwritten, such as rewritable optical discs or erasable memory devices.

[0287] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0288] The foregoing description of the present disclosure is for illustrative purposes only, and those skilled in the art will understand that modifications can be easily made to other specific forms without altering the technical spirit or essential features of the present disclosure. For example, suitable results may be achieved even if the described techniques are performed in a different order than described, and / or components such as systems, structures, devices, circuits, etc., described are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0289] The scope of the present disclosure is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present disclosure.

Claims

In a method for a terminal to transmit multi-user interference (MUI) information in a wireless communication system, A step of receiving configuration information related to MUI reporting from a base station; A step of receiving a reference signal (RS) for obtaining an MUI from the above base station; A step of acquiring an MUI based on configuration information related to the above MUI report and an RS for acquiring the above MUI; and A method comprising the step of transmitting an MUI report to the base station based on configuration information related to the above MUI report. In Article 1, The configuration information related to the above MUI report is, A method comprising at least one of information on whether MUI reporting is enabled, information on the MUI reporting method, information on the MUI reporting cycle, information on the precoder matrix to be used to measure MUI, information to be calculated as MUI, information to be included in the MUI reporting, and information on the MUI reporting method. In Article 1, The above method further includes the step of obtaining a list of MUI-PMI (precoder matrix index) to be measured for MUI; and The step of obtaining the above MUI is, A method for obtaining the MUI based on the precoder matrix included in the above MUI-PMI list, the channel information of the terminal, and the precoder matrix of the terminal. In Article 1, A method in which the RS for obtaining the above MUI is a CSI (channel state information)-RS. In Article 2, If the above MUI reporting method is set to periodic, the above MUI reporting period is set to an integer multiple of the CSI reporting period, and The above MUI report is transmitted together with the CSI report. In claim 2, the step of transmitting the MUI report is, A method for transmitting the MUI report based on information directed via DCI (downlink control information) when the above MUI reporting method is set to aperioditic. In claim 1, the above method is, A method further comprising the step of transmitting information related to terminal capability for MUI reporting to the base station. In a method for a base station to receive multi-user interference (MUI) information in a wireless communication system, A step of transmitting configuration information related to multi-user (MU) interference (MUUI) reporting to a terminal; A step of transmitting an RS (reference signal) to the above terminal to obtain an MUI; and A method comprising the step of receiving a report on an acquired MUI based on the configuration information related to the MUI report and the RS for acquiring the MUI, based on the configuration information related to the MUI report and the RS for acquiring the MUI. In a terminal transmitting multi-user interference (MUI) information in a wireless communication system, Transmitter / receiver; and It includes at least one processor, The above-mentioned at least one processor is, By controlling the above-mentioned transceiver, configuration information related to MUI reporting is received from the base station, and By controlling the above-mentioned transceiver, receive an RS (reference signal) for obtaining an MUI from the base station, and Based on the configuration information related to the above MUI report and the RS for acquiring the above MUI, acquire the MUI, and A terminal that controls the above-mentioned transceiver and transmits an MUI report to the base station based on configuration information related to the MUI report. In Clause 9, the configuration information related to the above MUI report is, A terminal comprising at least one of information on whether MUI reporting is enabled, information on the MUI reporting method, information on the MUI reporting cycle, information on the precoder matrix to measure MUI, information to be calculated as MUI, information to be included in the MUI report, and information on the MUI reporting method. In claim 9, the above at least one processor, By controlling the above-mentioned transceiver, a list of MUI-PMI (precoder matrix index) to be measured for MUI is obtained, and A terminal that obtains the MUI based on the precoder matrix included in the above MUI-PMI list, the channel information of the terminal, and the precoder matrix of the terminal. In Article 9, The RS for obtaining the above MUI is a CSI (channel state information)-RS, and A terminal that includes configuration information for CSI reporting, including configuration information related to the above MUI reporting. In Article 10, If the above MUI reporting method is set to periodic, the above MUI reporting period is set to an integer multiple of the CSI reporting period, and The above MUI report is transmitted together with the CSI report, terminal. In claim 9, the above at least one processor, A terminal that controls the above-mentioned transceiver to transmit information related to terminal capability for MUI reporting to the above-mentioned base station. In a base station receiving multi-user interference (MUI) information in a wireless communication system, Transmitter / receiver; and Includes at least one processor; and The above-mentioned at least one processor is, Control the above-mentioned transceiver to transmit configuration information related to multi-user (MU) interference (MUUI) reporting to the terminal, and By controlling the above-mentioned transceiver, an RS (reference signal) for obtaining an MUI is transmitted to the terminal, and A base station that controls the above-mentioned transceiver to receive a report on an acquired MUI based on the above-mentioned setting information related to the MUI report and the RS for acquiring the MUI.

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