Method and apparatus for combining signals between ofdm-based frequency domain paths

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transfer rates. A method performed by a first apparatus, according to an embodiment of the present disclosure, comprises the steps of: receiving, from a second apparatus, feedback information related to a frequency domain interval for a frequency domain closed-loop transmission control technique; after the feedback information is received, determining the frequency domain interval; and transmitting, to the second apparatus, a data channel to which the frequency domain closed-loop transmission control technique based on the determined frequency domain interval is applied.

Description

OFDM-based frequency domain path signal combination method and device

[0001] The present disclosure relates generally to wireless communication systems, and more particularly, to a method and device for operating a transmitter and a receiver for improving link performance between a terminal and a base station in a wireless communication system. Furthermore, the present disclosure relates to a method and device for combining signals between frequency domain paths for orthogonal frequency division multiplexing (OFDM) in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] The present disclosure proposes a transmission and reception technique and a channel information acquisition and sharing technique that maximizes channel gain when performing communication between transmitters and receivers in a multi-path channel environment.

[0009] The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0010] In order to solve the above-described problem, a method in a wireless communication system according to one embodiment of the present disclosure is characterized by including the steps of: receiving a first reference signal transmitted from a transmitting end; obtaining channel information based on the received first control reference signal; transmitting the information to the transmitting end; applying a transmission technique based on the information; transmitting control information on the transmission technique to the receiving end; and performing a receiving end operation based on the control information.

[0011] A method performed by a first device in a communication system according to one embodiment of the present disclosure comprises the steps of receiving feedback information related to a frequency domain spacing for frequency domain signal processing (a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme) from a second device, determining the frequency domain spacing after receiving the feedback information, and transmitting a data channel to which a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme, is applied based on the determined frequency domain spacing to the second device.

[0012] According to one embodiment of the present disclosure, the feedback information includes at least a portion of channel information related to a multi-path channel, the channel information includes one or more of path delay information per path related to the multi-path channel, information about a path delay difference between two or more paths, or channel impulse response (CIR) information, and the frequency domain interval is determined based on the channel information.

[0013] According to one embodiment of the present disclosure, the feedback information includes one or more values ​​corresponding to the frequency domain interval and is determined and reported by the second device.

[0014] According to one embodiment of the present disclosure, the configuration information for setting a control channel or wireless resource for scheduling the data channel includes information indicating the determined frequency domain interval.

[0015] According to one embodiment of the present disclosure, the frequency domain interval is based on a combination of one or more of RE (resource element) units, RB (resource block) units, or RBG (resource block group) units, and the frequency resources to which the data channel is mapped are determined by repeating one frequency resource set a number of times in the frequency domain, and the frequency domain interval is an interval between two adjacent frequency resource units among the repeated frequency resource units, and the one frequency resource set includes one or more combinations of one or more REs, one or more RBs, or one or more RBGs.

[0016] According to one embodiment of the present disclosure, the method comprises the step of transmitting settings related to frequency domain signal processing (e.g., a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme is applied).

[0017] A first device of a communication system according to one embodiment of the present disclosure comprises a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive feedback information related to a frequency domain spacing for frequency domain signal processing (a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme) from a second device; after receiving the feedback information, determine the frequency domain spacing; and transmit a data channel to which a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme, is applied based on the determined frequency domain spacing to the second device.

[0018] According to one embodiment of the present disclosure, the feedback information includes at least a portion of channel information related to a multi-path channel, the channel information includes one or more of path delay information for each path related to the multi-path channel, information about a delay difference between two or more paths or path groups, or channel impulse response (CIR) information, and the frequency domain interval is determined based on the channel information.

[0019] According to one embodiment of the present disclosure, the feedback information includes one or more values ​​corresponding to the frequency domain interval and is determined and reported by the second device.

[0020] According to one embodiment of the present disclosure, the configuration information for setting a control channel or wireless resource for scheduling the data channel includes information indicating the determined frequency domain interval.

[0021] According to one embodiment of the present disclosure, the frequency domain interval is based on a combination of one or more of RE (resource element) units, RB (resource block) units, or RBG (resource block group) units, and the frequency resources to which the data channel is mapped are determined by repeating one frequency resource set a number of times in the frequency domain, and the frequency domain interval is an interval between two adjacent frequency resource units among the repeated frequency resource units, and the one frequency resource set includes one or more combinations of one or more REs, one or more RBs, or one or more RBGs.

[0022] According to one embodiment of the present disclosure, the processor is configured to transmit settings related to frequency domain signal processing (e.g., a frequency domain closed loop transmission control scheme, e.g., a frequency domain precoding scheme or a frequency domain diversity scheme is applied).

[0023] A method performed by a second device in a communication system according to one embodiment of the present disclosure comprises the steps of: receiving one or more RSs (reference signals) from a first device; determining feedback information related to a frequency domain interval for frequency domain signal processing (a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme) based on the one or more RSs; transmitting the feedback information to the first device; and receiving, from the second device, a data channel to which a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme, based on the frequency domain interval is applied.

[0024] According to one embodiment of the present disclosure, the feedback information includes at least a portion of channel information related to a multi-path channel or one or more values ​​corresponding to the frequency domain interval determined by the second device, the channel information includes one or more of path delay information per path related to the multi-path channel, information about a path delay difference between two or more paths, or channel impulse response (CIR) information, and a control channel for scheduling the data channel includes information indicating the frequency domain interval.

[0025] A second device of a communication system according to one embodiment of the present disclosure comprises a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive one or more RSs (reference signals) from a first device; determine feedback information related to a frequency domain spacing for frequency domain signal processing (a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme) based on the one or more RSs; transmit the feedback information to the first device; and receive, from the second device, a data channel to which a frequency domain closed loop transmission control scheme, for example, a frequency domain precoding scheme or a frequency domain diversity scheme, based on the frequency domain spacing is applied.

[0026] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0027] According to one embodiment of the present disclosure, link performance can be maximized in a general multi-path channel environment, thereby increasing communication performance.

[0028] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0029] FIG. 1 illustrates an example of a wireless network according to an embodiment of the present disclosure.

[0030] FIG. 2 illustrates an example of a gNB according to an embodiment of the present disclosure.

[0031] FIG. 3 illustrates an example of a UE according to an embodiment of the present disclosure.

[0032] FIG. 4 illustrates an example of a wireless transmission path according to the present disclosure.

[0033] FIG. 5 illustrates an example of a wireless reception path according to the present disclosure.

[0034] FIG. 6 is an example of a multi-path channel in a communication system applying beamforming to which one embodiment of the present disclosure is applicable.

[0035] FIG. 7 is a diagram illustrating an example of multi-path channel frequency selective fading in a communication system to which one embodiment of the present disclosure is applicable.

[0036] FIG. 8 is a diagram illustrating an example of multi-path channel frequency selective fading in a communication system to which one embodiment of the present disclosure is applicable.

[0037] FIG. 9 illustrates an example of a frequency domain diversity scheme in a communication system to which one embodiment of the present disclosure is applicable.

[0038] FIG. 10 illustrates an example of diversity gain in a multi-path channel environment to which one embodiment of the present disclosure is applicable.

[0039] FIG. 11 is an example of the basic concept of an inter-path channel combining technique according to one embodiment of the present disclosure.

[0040] FIG. 12 illustrates an example of the operation of a transmitter and a receiver according to one embodiment of the present disclosure.

[0041] Figure 13 illustrates one embodiment of the present disclosure.

[0042] Figure 14 illustrates one embodiment of the present disclosure.

[0043] Figure 15 is an experimental example related to the performance of a method according to one embodiment of the present disclosure.

[0044] Fig. 16 is an experimental example related to the performance of a method according to one embodiment of the present disclosure.

[0045] FIG. 17 illustrates an example of a receiver structure according to one embodiment of the present disclosure.

[0046] FIG. 18 is an example of an embodiment of the present disclosure in which a non-uniform repetition pattern is applied.

[0047] Figure 19a is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0048] Figure 19b is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0049] Figure 19c is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0050] FIG. 19d is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0051] Figure 19e is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0052] Figure 19f is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0053] Figure 19g is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0054] Figure 19h is a drawing showing an experimental example for explaining one embodiment of the present disclosure.

[0055] FIG. 20 illustrates an example of the operation of a transmitting node according to one embodiment of the present disclosure.

[0056] FIG. 21 illustrates an example of the operation of a receiving node according to one embodiment of the present disclosure.

[0057] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0058] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to ensure that the gist of the present disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0059] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0060] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and these may vary depending on the intention or custom of the user or operator. Therefore, their definitions should be made based on the contents throughout the specification.

[0061] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0062] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0063] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0064] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0065] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP (3rd Generation Partnership Project)'s HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0066] As a representative example of the above broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0067] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0068] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band.

[0069] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage. This may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0070] Finally, URLLC refers to cellular-based wireless communication services used for specific mission-critical purposes. Examples include remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, URLLC communications must offer extremely low latency and high reliability. For example, URLLC-enabled services must meet air interface latency requirements of less than 0.5 milliseconds and a packet error rate (PER) of 10-5 or lower. Therefore, for URLLC-enabled services, 5G systems must provide shorter Transmit Time Intervals (TTIs) than other services, while simultaneously allocating extensive resources in the frequency band to ensure communication link reliability.

[0071] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0072] Hereinafter, a / b can be understood as at least one of a or b.

[0073] Figures 1 through 3 below illustrate various embodiments implemented using orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication technology in a wireless communication system. The descriptions of Figures 1 through 3 do not imply any physical or structural limitations on how the various embodiments may be implemented. The various embodiments of the present disclosure may be implemented in any appropriately deployed communication system.

[0074] FIG. 1 illustrates an exemplary wireless network according to the present disclosure. The embodiment of the wireless network illustrated in FIG. 1 is for illustrative purposes only. Other embodiments of the wireless network (100) may be utilized without departing from the scope of the present disclosure.

[0075] As illustrated in FIG. 1, the wireless network includes a gNB (101) (e.g., a base station (BS)), a gNB (102), and a gNB (103). The gNB (101) communicates with the gNB (102) and the gNB (103). The gNB (101) also communicates with at least one network (130), such as the Internet, a proprietary Internet Protocol (IP) network, or another data network.

[0076] A gNB (102) provides wireless broadband access to a network (130) for a first plurality of user equipment (UE) within a coverage area (120) of the gNB (102). The first plurality of UEs includes 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) such as a cell phone, a wireless laptop, a wireless PDA, etc. The gNB (103) provides wireless broadband access to the network (130) for a second plurality of UEs within the coverage area (125) of the gNB (103). The second plurality of UEs includes UE (115) and UE (116). In some embodiments, one or more of the gNBs (101-103) may communicate with each other and with the UEs (111-116) using 5G / NR, long term evolution (LTE), long term evolution-advanced (LTE-A), WiMAX, WiFi, or other wireless communication technologies.

[0077] Depending on the network type, the term "base station" or "BS" may refer to any component (or set of components) configured to provide wireless access to the network, such as a transmit point (TP), a transmit-receive point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macrocell, a femtocell, a WiFi access point (AP), or other wirelessly enabled device. A base station may provide wireless access according to one or more wireless communication protocols, for example, 5G / NR 3GPP NR, long term evolution (LTE), LTE-advanced (LTE-A), high speed packet access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms "BS" and "TRP" are used throughout this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term "user equipment" or "UE" may refer to any component, such as a "mobile station," a "subscriber station," a "remote terminal," a "wireless terminal," a "receive point," or a "user device."For convenience, the terms "user device" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smart phone) or is generally considered a stationary device (such as a desktop computer or vending machine).

[0078] The dotted lines show the approximate extent of the coverage areas (120 and 125), which are depicted as nearly circular for illustration and illustrative purposes only. It should be clearly understood that the coverage areas associated with a gNB, such as coverage areas (120 and 125), may have different shapes, including irregular shapes, depending on the configuration of the gNB and variations in the wireless environment associated with natural and man-made obstructions.

[0079] As described in more detail below, one or more of the UEs (111-116) include circuitry, programming, or a combination thereof for TCI status indication for a control channel in a wireless communication system. In certain embodiments, one or more of the gNBs (101-103) include circuitry, programming, or a combination thereof for TCI status indication for a control channel in a wireless communication system.

[0080] Although FIG. 1 illustrates an example of a wireless network (100), various modifications to FIG. 1 may be made. For example, the wireless network (100) may include any number of gNBs and any number of UEs in any suitable arrangement. Furthermore, gNBs (101) may communicate directly with any number of UEs and provide these UEs with wireless broadband access to the network (130). Similarly, each gNB (102-103) may communicate directly with the network (130) and provide UEs with direct wireless broadband access to the network. Furthermore, gNBs (101, 102, and / or 103) may provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0081] FIG. 2 illustrates an exemplary gNB (102) according to an embodiment of the present disclosure. The embodiment of the gNB (102) illustrated in FIG. 2 is for illustrative purposes only, and the gNBs (101 and 103) of FIG. 1 may have the same or similar configurations. However, gNBs have various configurations, and FIG. 2 does not limit the scope of the present disclosure to any particular implementation of a gNB.

[0082] As illustrated in FIG. 2, the gNB (102) includes multiple antennas (205a-205n), multiple radio frequency (RF) transceivers (210a-210n), transmit (TX) processing circuitry (215), and receive (RX) processing circuitry (220). The gNB (102) also includes a control unit / processor (225), memory (230), and a backhaul or network interface (235).

[0083] The RF transceivers (210a-210n) receive incoming RF signals, such as signals transmitted by UEs in the network (100), from the antennas (205a-205n). The RF transceivers (210a-210n) downconvert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are transmitted to the RX processing circuitry (220), which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuitry (220) transmits the processed baseband signals to the control unit / processor (225) for further processing.

[0084] The TX processing circuit (215) receives analog or digital data (such as voice data, web data, email, or interactive video game data) from the control unit / processor (225). The TX processing circuit (215) encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceivers (210a-210n) receive the processed baseband or IF signal outgoing from the TX processing circuit (215) and upconvert the baseband or IF signal to an RF signal that is transmitted via the antennas (205a-205n).

[0085] The control unit / processor (225) may include one or more processors or other processing devices that control the overall operation of the gNB (102). For example, the control unit / processor (225) may control the reception of UL channel signals and the transmission of DL channel signals by the RF transceivers (210a-210n), the RX processing circuitry (220), and the TX processing circuitry (215) according to well-known principles. The control unit / processor (225) may also support additional functions, such as more advanced wireless communication functions. For example, the control unit / processor (225) may support beamforming or directional routing operations in which outgoing signals from multiple antennas (205a-205n) are differently weighted to effectively steer outgoing signals in a desired direction. Any of a variety of other functions may be supported in the gNB (102) by the control unit / processor (225).

[0086] The control unit / processor (225) can also execute programs and other processes residing in the memory (230), such as an operating system (OS). The control unit / processor (225) can move data into and out of the memory (230) as required by the executing process.

[0087] The control unit / processor (225) is also coupled to a backhaul or network interface (235). The backhaul or network interface (235) allows the gNB (102) to communicate with other devices or systems via a backhaul connection or a network. The interface (235) may support communication via any suitable wired or wireless connection. For example, when the gNB (102) is implemented as part of a cellular communication system (such as one supporting 5G, LTE, or LTE-A), the interface (235) may allow the gNB (102) to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB (102) is implemented as an access point, the interface (235) may allow the gNB (102) to communicate with a wired or wireless local area network or a larger network (such as the Internet) via a wired or wireless connection. The interface (235) includes any suitable structure that supports communication via a wired or wireless connection, such as Ethernet or an RF transceiver.

[0088] Memory (230) is coupled to the control unit / processor (225). A portion of the memory (230) may include RAM, and another portion of the memory (230) may include flash memory or other ROM.

[0089] While FIG. 2 illustrates an example of a gNB (102), various modifications to FIG. 2 may be made. For example, the gNB (102) may include any number of each of the components illustrated in FIG. 2. As a specific example, the access point may include multiple interfaces (235), and the controller / processor (225) may support TCI status indications for a control channel in a wireless communication system. As another specific example, while illustrated as including a single instance of TX processing circuitry (215) and a single instance of RX processing circuitry (220), the gNB (102) may include multiple instances of each (such as one per RF transceiver). Furthermore, the various components of FIG. 2 may be combined, further subdivided, or omitted, and additional components may be added as needed.

[0090] FIG. 3 illustrates an exemplary UE (116) according to an embodiment of the present disclosure. The embodiment of the UE (116) illustrated in FIG. 3 is for illustrative purposes only, and the UEs (111-115) of FIG. 1 may have the same or similar configurations. However, UEs may have various configurations, and FIG. 3 does not limit the scope of the present disclosure to any particular implementation of the UE.

[0091] As illustrated in FIG. 3, the UE (116) includes an antenna (305), a radio frequency (RF) transceiver (310), a TX processing circuit (315), a microphone (320), and a receive (RX) processing circuit (325). The UE (116) also includes a speaker (330), a processor (340), an input / output (I / O) interface (IF) (345), a touchscreen (350), a display (355), and a memory (360). The memory (360) includes an operating system (OS) (361) and one or more applications (362).

[0092] An RF transceiver (310) receives, from an antenna (305), an incoming RF signal transmitted by a gNB of a network (100). The RF transceiver (310) downconverts 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) which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. The RX processing circuit (325) transmits the processed baseband signal to a speaker (330) (such as for voice data) or to a processor (340) for further processing (such as for web browsing data).

[0093] The TX processing circuit (315) receives analog or digital voice data from the microphone (320) or other outgoing baseband data (such as web data, email, or interactive video game data) from the processor (340). The TX processing circuit (315) encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver (310) receives the processed baseband or IF signal from the TX processing circuit (315) and upconverts the baseband or IF signal to an RF signal that is transmitted via the antenna (305).

[0094] The processor (340) may include one or more processors or other processing devices and may execute an OS (361) stored in the memory (360) to control the overall operation of the UE (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) according to well-known principles. In some embodiments, the processor (340) includes at least one microprocessor or microcontroller.

[0095] The processor (340) may also execute other processes and programs residing in the memory (360), such as a process for TCI status indication for a control channel in a wireless communication system. The processor (340) may move data into and out of the memory (360) as required by the executing process. In some embodiments, the processor (340) is configured to execute an application (362) based on the OS (361) or in response to signals received from the gNB or the operator. The processor (340) is also coupled to an I / O interface (345) that provides the UE (116) with the ability to connect to other devices, such as laptop computers and handheld computers. The I / O interface (345) is a communication path between these accessories and the processor (340).

[0096] The processor (340) is also coupled to a touchscreen (350) and a display (355). An operator of the UE (116) can use the touchscreen (350) to input data into the UE (116). The display (355) may be a liquid crystal display, a light emitting diode display, or other display capable of rendering text and / or at least limited graphics, such as from a web site.

[0097] A memory (360) is coupled to the processor (340). A portion of the memory (360) may include random access memory (RAM), and another portion of the memory (360) may include flash memory or other read-only memory (ROM).

[0098] While FIG. 3 illustrates an example of a UE (116), various modifications to FIG. 3 may be made. For example, various components of FIG. 3 may be combined, further subdivided, or omitted, and additional components may be added as needed. As a specific example, the processor (340) may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, while FIG. 3 illustrates a UE (116) configured as a mobile phone or smart phone, the UE may be configured to operate as other types of mobile or stationary devices.

[0099] Figures 4 and 5 illustrate exemplary wireless transmit and receive paths according to the present disclosure. In the following description, the transmit path (400) may be described as being implemented in a gNB (e.g., gNB (102)), while the receive path (500) may be described as being implemented in a UE (e.g., UE (116)). However, it may be appreciated that the receive path (500) may be implemented in a gNB, and the transmit path (400) may be implemented in a UE. In some embodiments, the receive path (500) is configured to support a codebook design and structure for a system having a 2D antenna array, as described in embodiments of the present disclosure.

[0100] As illustrated in FIG. 4, the transmission path (400) includes a channel coding and modulation block (405), a serial-to-parallel (S-to-P) block (410), a size N inverse fast Fourier transform (IFFT) block (415), a parallel-to-serial (P-to-S) block (420), an add cyclic prefix block (425), and an up-converter (UC) (430). As illustrated in FIG. 5, the receiving path (500) includes a down-converter (DC) (555), a remove cyclic prefix block (560), a serial-to-parallel (S-to-P) block (565), a size N fast Fourier transform (FFT) block (570), a parallel-to-serial (P-to-S) block (575), and a channel decoding and demodulation block (580).

[0101] As illustrated in FIG. 4, the channel coding and modulation block (405) receives a set of information bits, applies coding (e.g., low-density parity check (LDPC) coding), and modulates the input bits (e.g., quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a series of frequency-domain modulation symbols.

[0102] The serial-to-parallel block (410) converts (e.g., de-multiplexes) serial modulated symbols to parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in the gNB (102) and the UE (116). The size N IFFT block (415) performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block (420) converts (e.g., de-multiplexes) the parallel time-domain output symbols from the size N IFFT block (415) to generate a serial time-domain signal. The cyclic prefix add block (425) inserts a cyclic prefix into the time-domain signal. The upconverter (430) modulates (e.g., upconverts) the output of the cyclic prefix add block (425) to an RF frequency for transmission over a wireless channel. The signal may also be filtered at baseband before being converted to an RF frequency.

[0103] The RF signal transmitted from the gNB (102) reaches the UE (116) after passing through the wireless channel, and the reverse operation of the operation in the gNB (102) is performed in the UE (116).

[0104] As illustrated in FIG. 5, the downconverter (255) downconverts the received signal to a baseband frequency, and the 'remove cyclic prefix' block (560) removes the cyclic prefix to generate a serial time-domain baseband signal. The serial-to-parallel block (565) converts the time-domain baseband signal to a parallel time-domain signal. The size N FFT block (570) performs an FFT algorithm to generate N parallel frequency-domain signals. The parallel-to-serial block (575) converts the parallel frequency-domain signals into a series of modulated data symbols. The channel decoding and demodulation block (580) demodulates and decodes the modulated symbols to restore the original input data stream.

[0105] Each of the gNBs (101-103) may implement a transmit path (400) similar to that for transmitting to the UEs (111-116) in the downlink as illustrated in FIG. 4, and may implement a receive path (500) similar to that for receiving from the UEs (111-116) in the uplink as illustrated in FIG. 5. Similarly, each of the UEs (111-116) may implement a transmit path (400) for transmitting to the gNBs (101-103) in the uplink and may implement a receive path (500) for receiving from the gNBs (101-103) in the downlink.

[0106] Each component in FIGS. 4 and 5 may be implemented using only hardware or a combination of hardware and software / firmware. As a specific example, at least some of the components in FIGS. 4 and 5 may be implemented in software, while other components may be implemented using configurable hardware or a combination of software and configurable hardware. For example, the FFT block (570) and the IFFT block (515) may be implemented as configurable software algorithms, wherein the value of the size N may be modified depending on the implementation.

[0107] Also, although described as using FFT and IFFT, this is only an example and should not be construed as limiting the scope of the present disclosure. Other types of transforms, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions, may be used. It may be understood that for the DFT and IDFT functions, the value of the N variable may be any integer (e.g., 1, 4, 3, 4, etc.), whereas for the FFT and IFFT functions, the value of the N variable may be any integer that is a power of 2 (e.g., 1, 2, 4, 8, 16, etc.).

[0108] Although FIGS. 4 and 5 illustrate examples of wireless transmission and reception paths, various modifications to FIGS. 4 and 5 may be made. For example, various components in FIGS. 4 and 5 may be combined, further subdivided, or omitted, and additional components may be added as needed. Furthermore, FIGS. 4 and 5 are intended to illustrate examples of types of transmission and reception paths that may be used in a wireless network. Other suitable architectures may be used to support wireless communications in a wireless network.

[0109] A unit for DL ​​signaling or UL signaling on a cell is called a slot, which may include one or more symbols. A bandwidth (BW) unit is called a resource block (RB). One RB includes multiple subcarriers (SCs). For example, a slot may have a duration of 1 millisecond, an RB may have a bandwidth of 180 KHz, and may include 12 SCs with an inter-SC spacing of 15 KHz. A slot may be a full DL slot, a full UL slot, or a hybrid slot similar to a specific subframe in a Time Division Duplex (TDD) system.

[0110] A DL signal includes a data signal carrying information content, a control signal carrying DL control information (DCI), and a reference signal (RS), also known as a pilot signal. The gNB transmits data information or DCI through each physical DL shared channel (PDSCH) or physical DL control channel (PDCCH). The PDSCH or PDCCH may be transmitted over a number of slot symbols, each of which includes one slot symbol. The UE may be indicated a spatial configuration for PDCCH reception based on a value set for a transmission configuration indication state (TCI state) of a control resource set (CORESET) through which the UE receives the PDCCH. The UE may be indicated a spatial configuration for PDSCH reception based on a configuration by a higher layer or an indication by a DCI format that schedules PDSCH reception for a value for a TCI state. The gNB may configure the UE to receive signals on a cell within the DL bandwidth portion (BWP) of the cell DL BW.

[0111] The gNB transmits one or more types of RSs, including channel state information RS (CSI-RS) and demodulation RS (DMRS). CSI-RS is primarily for the UE to perform measurements and provide channel state information (CSI) to the gNB. For channel measurements, non-zero power CSI-RS (NZP CSI-RS) resources are used. For interference measurement reports (IMR), CSI interference measurement (CSI-IM) resources associated with zero power CSI-RS (ZP CSI-RS) configurations are used. CSI processes are configured with NZP CSI-RS and CSI-IM resources. The UE can determine CSI-RS transmission parameters from the gNB through higher layer signaling, such as DL control signaling or RRC signaling. The transmission instance of CSI-RS can be indicated by DL control signaling or configured by higher-layer signaling. DMRS is transmitted only in the BW of each PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0112] The UL signal also includes a data signal carrying information content, a control signal carrying UL control information (UCI), a DMRS associated with data or UCI demodulation, a sound receiver signal (SRS) that allows the gNB to perform UL channel measurement, and a random access (RA) preamble that allows the UE to perform random access. The UE transmits data information or UCI through each Physical UL Shared Channel (PUSCH) or Physical UL Control Channel (PUCCH). The PUSCH or PUCCH can be transmitted through a variable number of slot symbols, each of which includes one slot symbol. The gNB can configure the UE to transmit signals on a cell within the UL BWP of the cell's UL BW.

[0113] The UCI includes hybrid automatic repeat request acknowledgment (HARQ-ACK) information indicating correct or incorrect detection of a data transport block (TB) on the PDSCH, a scheduling request (SR) indicating whether the UE has data in its buffer, and a CSI report that allows the gNB to select appropriate parameters for PDSCH or PDCCH transmission to the UE. The HARQ-ACK information can be configured to have a granularity smaller than per TB, and can be per data code block (CB) or per data CB group where a data TB includes multiple data CBs.

[0114] A CSI report from a UE may include a channel quality indicator (CQI) that informs the gNB of the maximum modulation and coding scheme (MCS) for which the UE detects a data TB with a predetermined BLER, such as 10% block error rate (BLER), a precoding matrix indicator (PMI) that informs the gNB of how to combine signals from multiple transmitter antennas according to a multiple input multiple output (MIMO) transmission principle, and a rank indicator (RI) that indicates the transmission rank for the PDSCH. UL RS includes a DMRS and a SRS. The DMRS is transmitted only within the BW of each PUSCH or PUCCH transmission. The gNB may use the DMRS to demodulate information from each PUSCH or PUCCH. The SRS is transmitted by the UE to provide UL CSI to the gNB, and for TDD systems, the SRS transmission may also provide PMI for DL ​​transmissions. Additionally, to establish synchronization or initial upper layer connection with the gNB, the UE may transmit a physical random access channel.

[0115] Mobile communication and various wireless communication systems that communicate via wireless connections experience air interface path attenuation, which increases significantly as the frequency band increases. For example, 5G communication systems, which communicate in bands above 3 GHz, experience higher path attenuation than LTE, which communicates in lower bands, resulting in coverage issues. Some 5G communication systems operating in mmWave bands are experiencing even more severe path attenuation, limiting their service. 6G communication systems, which aim to support communications over a wider bandwidth than 5G, are likely to communicate in higher frequency bands, and thus, path attenuation is also expected to increase.

[0116] Array antenna systems and MIMO beamforming have been developed to overcome high path attenuation, and these techniques have proven particularly effective in high-frequency bands. The gains from array antennas and MIMO beamforming are achieved by imparting high directionality to signal propagation and concentrating power along a specific path. Furthermore, wireless signals exhibit high linearity in high-frequency bands, and their relatively short wavelengths allow for the implementation of array antennas in a smaller space. These characteristics make MIMO a highly effective means of improving performance in high-frequency bands.

[0117] On the other hand, as the directionality of high-frequency band signal propagation with high straightness is enhanced by MIMO, there is a drawback that the signal path attenuation increases significantly and link performance deteriorates severely when a shadowing environment or, more generally, a Non-Line of Sight (NLoS) environment is created where the signal propagation path is obscured by obstacles. To overcome the above drawback, a method of obtaining additional power gain through signal repetition has been devised. However, existing retransmission techniques have a high radio resource consumption rate compared to the gain that can be obtained, and are therefore only used in specific situations. Therefore, the present disclosure proposes a method that can more efficiently improve the high path attenuation that occurs in an NLoS environment.

[0118] One embodiment of the present disclosure may relate to a method and device for determining a signal transmission method or a wireless resource to which a signal is mapped in the frequency domain based on a Channel Impulse Response (CIR) or a delay value per path of a channel.

[0119] FIG. 6 is an example of a multi-path channel in a communication system applying beamforming to which one embodiment of the present disclosure is applicable.

[0120] Referring to FIG. 6, a beam or beam pair to be used can be determined based on the RSRP (reference signal received power) of the RS (Reference signal), and transmission and reception can be performed through the beam or beam pair. When the beam or beam pair is determined, transmission in a specific direction or transmission and reception in a specific direction are determined based on the RSRP measurement of the reference signal, but transmission or transmission and reception in the specific direction is actually performed by propagating a signal through multiple paths that have similarity in direction, as illustrated in FIG. 6. In other words, signal transmission and reception in a specific direction can also be understood as signal transmission and reception through multiple paths (multi-path). De-cumulating the signal transmission and reception through multiple paths can correspond to signal transmission and reception in a specific direction. FIG. 6 is a diagram of multiple paths generated when a transmitter performs beamforming through two transmit antennas as an example. In the diagram, each arrow represents the gain of a path having a different delay. The horizontal axis represents the phase difference, either relative to the path with the shortest delay or due to the delay difference compared to the path with the shortest delay. If the phase difference is between 135 and 225 degrees, the path becomes a de-cumulating path that attenuates the received RSRP.

[0121] FIGS. 7 and 8 are diagrams illustrating an example of multi-path channel frequency selective fading in a communication system to which an embodiment of the present disclosure is applicable. In FIGS. 7 and 8, the x-axis represents the frequency axis (e.g., in Hz), and the y-axis represents RSRP (in dBm) or channel gain (in dB). Since the phase difference due to the delay difference between each path varies depending on the frequency, each path may be a de-cumulating path at each frequency and an accumulating path at another frequency. Therefore, as shown in FIGS. 7 and 8, a channel composed of multi-paths has a complex fading pattern in the frequency domain.

[0122] Due to the above multi-path, the RSRP or channel gain of the signal may show fluctuations in the frequency axis / frequency domain as exemplified in FIGS. 7 and 8, which may be referred to as frequency selective fading. The frequency selectivity of the Channel (or channel gain) and / or RSRP may vary in degree depending on the number and distribution of paths. For example, as exemplified in FIG. 7, when the number of paths is large, the Channel (or channel gain) and / or RSRP show rapid fluctuations in the frequency axis / frequency domain, and conversely, as exemplified in FIG. 8, when the number of paths is small, the Channel (or channel gain) and / or RSRP show relatively gentle fluctuations in the frequency axis / frequency domain.

[0123] Due to frequency selectivity, the receiver may fail to receive information transmitted through a frequency band or sub-carrier with a low channel gain with a relatively high probability, and the receiver may succeed in receiving information transmitted through a band or sub-carrier with a relatively high channel gain with a relatively high probability.

[0124] As illustrated in Fig. 7, when RSRP or channel gain changes abruptly in the frequency domain, the channel gain can be seen to change randomly in the frequency domain. Therefore, it can be seen that information reception failure, i.e., bit errors, can occur in random frequency bands or subcarriers. This phenomenon of bit errors occurring in random frequency positions can generally be overcome by applying channel coding that guarantees high gain.

[0125] On the other hand, when the RSRP or channel gain changes relatively gradually as illustrated in FIG. 8, a bit error burst may occur, causing the receiver to repeatedly fail to receive information transmitted through a specific frequency band, for example, a subband or adjacent sub-carriers. This may further increase the probability of failure in receiving a frame or transmission block. Therefore, when a channel is configured by a small number of paths as illustrated in FIG. 7, a bit interleaving operation may be added to prevent the occurrence of a bit error burst, and a frequency diversity scheme may be additionally applied as a technique to reduce bit errors.

[0126] FIG. 9 illustrates an example of a frequency domain diversity scheme in a communication system to which one embodiment of the present disclosure is applicable. That is, FIG. 9 is an example of applying a frequency domain diversity scheme in a frequency selective channel. The frequency selective channel refers to the contents illustrated in FIGS. 7 and 8.

[0127] Referring to Fig. 9, information transmitted through a sub-band (or sub-carrier) (901) has a high probability of failure in reception at the receiver. However, when the same information is repeatedly transmitted through a sub-band (or sub-carrier) (903), the receiver can repeatedly receive the same information through a sub-band (or sub-carrier) (901) with a very low channel gain and a sub-band (or sub-carrier) (903) with a relatively high channel gain, thereby ensuring that the actual channel gain of the information is above a certain level. The larger the number of repeated transmissions, i.e., the repetition factor, the higher the probability that the information will have an actual channel gain above a certain level. In addition, a longer distance between repeated transmissions is more advantageous for securing an actual channel gain than a shorter distance. In other words, previous research has shown that a larger interval between repeatedly transmitted sub-bands (or sub-carriers) is more advantageous for securing an actual channel gain.

[0128] When beamforming is applied to the transmitter, the signal is propagated only in a specific direction, so the signal propagation path (or path) is limited to a specific direction. In other words, when beamforming is applied to the transmitter, the number of paths is reduced, and the channel is configured in a form closer to the example of FIG. 8 than the example of FIG. 7. Therefore, when beamforming is applied to the transmitter, it can be seen that there is a high possibility and necessity of securing performance gains through a frequency domain diversity scheme. However, the frequency domain diversity scheme only has the effect of making the channel gain constant through inter-channel mixing, and does not have the effect of increasing the channel gain itself, and its use in current communication systems is decreasing due to the advent of efficient bit interleavers.

[0129] FIG. 10 illustrates an example of diversity gain in a multi-path channel environment to which one embodiment of the present disclosure is applicable. Referring to FIG. 10, the channel gain that can be secured through a diversity technique (frequency domain diversity scheme) is described in more detail as follows.

[0130] For convenience of explanation, we assume a channel consisting of two paths. The channel gain secured in each sub-band or sub-carrier and the actual channel gain that can be secured through frequency domain diversity are explained through the example in Figure 10.

[0131] When a signal is transmitted through a sub-band or sub-carrier corresponding to frequencies fa and fb in a channel consisting of two paths h0 and h1 having different delays and gains, the signal of each sub-band or sub-carrier is received at the receiver through a channel represented by H(fa) and H(fb), respectively. The two paths h0 and h1 can be measured through the channel impulse response, as described in Fig. 12.

[0132] Referring to Fig. 10, h0 and h1 have different phase differences at each frequency, so the total channel gain expressed as the sum of the two paths shows different channel gains depending on each frequency. In the case of the example of Fig. 5, the two paths have different phase differences at each frequency f a has a relatively small phase difference, and the frequency f b In has a phase difference that is larger than 180 degrees. That is, is expressed as, and has a relatively small phase difference. On the other hand, is expressed as, and has a relatively large phase difference. Therefore, the channel gain ( ) determined by the sum of the two paths and ), the frequency f a While it shows relatively good values ​​at frequency f b In , the signals passing through the two paths cancel each other out, so the channel gain becomes relatively very small. That is, at the frequency f b There is a very high probability that the information transmitted through the receiver will fail to be received.

[0133] On the other hand, in order to secure frequency diversity gain, if the same information or signal is repeatedly transmitted to the sub-carrier or sub-band corresponding to the two frequencies, the information or signal passes through both of the different channels to reach the receiver, so the actual channel gain is the average of the two channel gains. ) is given. Therefore, it is possible to avoid cases where signals or information experience extremely low channel gain and fail to be received at the receiver. However, as described above, this frequency diversity technique does not play a role in increasing the actual channel gain.

[0134] According to one embodiment of the present disclosure, a method and device can be provided for decomposing and combining each path component constituting a channel so that a propagated signal always obtains the best practical channel gain.

[0135] Fig. 11 is an example of the basic concept of an inter-path channel combining technique according to an embodiment of the present disclosure. Fig. 11 is an overview of channel gain maximization according to an embodiment of the present disclosure.

[0136] Referring to Fig. 11, a path having different delays or a signal passing through the path can be expressed as a sum of two elements having different phase differences for each frequency as described above. By applying this, the two elements, i.e., paths having different delays, or signal elements received through paths having different delays can be distinguished without performing complex signal processing in the time domain, such as a RAKE receiver used in CDMA (code-division multiple access).

[0137] That is, the receiving end signal received through each path or each path can be distinguished through the frequency domain repeated transmission operation of the transmitting end and / or the frequency domain path isolation operation of the receiving end. That is, the transmitting end can transmit a signal through the frequency domain repeated transmission operation, and the receiving end can distinguish the signal through the frequency domain path isolation operation. (Hereinafter, unless specifically stated otherwise, repeated transmission in the present disclosure may mean frequency domain repeated transmission.)

[0138] For example, in a transmitter, a channel consisting of two paths h0 and h1 has a frequency f a and f b The signal can be transmitted as a frequency domain repeated transmission through the corresponding sub-band or sub-carrier. For example, at the receiver, the signal corresponding to path h0 can be transmitted through frequency domain path isolation. and , and corresponding to path h1 and can be distinguished. This is regardless of the frequency band at the receiver. and This means that the two received signal components can be distinguished with the path gain.

[0139] Afterwards, if the receiver combines the received signals with the path gain as above at each frequency, regardless of the frequency, The channel gain can be secured. The sum of two vectors with different phases is Since the relationship is established, the channel gain obtained through the inter-path combining (co-phased combining) is the maximum channel gain that can be theoretically secured. Fig. 11 is an example of the inter-path combining, in which two paths having different phases and For signals received through The signal received through to have the same phase as the signal received through Perform phase correction on the signal received through Here is an example of the actual channel gain obtained when combining the signal received through the path The channel characteristics of has the same phase shift as is changed to . As in the example above, the path If the phase correction operation as above is performed only on the signal received through am.

[0140] Fig. 12 illustrates an example of the operation of a transmitter and a receiver according to an embodiment of the present disclosure. Fig. 12 is a schematic diagram of a channel gain maximization operation according to an embodiment of the present disclosure.

[0141] Referring to FIG. 12, as a first step operation, a receiver obtains information about a path through transmission and reception of a reference signal (RS). The receiver receives the reference signal transmitted from the transmitter and obtains information about the path based on the reference signal. The path information may be Channel Impulse Response (CIR) information including power and delay information of each path. And / or the path information may include only path delay information. And / or the path information may be information for the receiver to infer differences caused by delay differences between paths in a channel composed of multiple paths, such as information about delay differences between paths, phase differences between paths, or other sub-band / sub-carrier phase differences.

[0142] As a second step operation, the receiver transmits / transmits the path information (e.g., information about path delay) to the transmitter. The path information may be direct information about each path or differences between paths, such as path delay, CIR, etc., as described in the first step. And / or, the information that the receiver transmits to the transmitter may be direct or indirect information about Tx adaptation to be performed by the transmitter based on the information measured in the first step. For example, the information that the receiver transmits to the transmitter may include information about a repetition pattern to be performed by the transmitter based on the information measured in the first step, information about a repetition factor, etc.

[0143] As a third step operation, the transmitter performs a Tx adaptation operation based on the path information (e.g., information about path delay). The specific details of the Tx adaptation operation are described below in connection with an embodiment of the present disclosure. For example, the Tx adaptation operation may include adjusting / setting the frequency domain repetition interval 'q' described below.

[0144] As a fourth step operation, the transmitter transmits / transmits information about the performance of the Tx adaptation operation to the receiver. The information may be transmitted / transmitted to the receiver in the form of control information, a reference signal, etc. For example, the transmitter may transmit information about the Tx adaptation method, for example, a repetition pattern or a repetition factor, to the receiver through control information. And / or the transmitter may transmit a reference signal that enables the receiver to detect the repetition pattern to the receiver.

[0145] As a fifth step operation, the transmitter transmits the signal to which the Tx adaptation has been applied to the receiver. The signal to which the Tx adaptation has been applied may be composed of a portion containing information (data channel) and a reference signal, or may be composed solely of a portion containing information (data channel). In addition, the portion containing information and the reference signal may be transmitted via different wireless resources, and the information and the reference signal may be transmitted via different Tx adaptation operations.

[0146] For example, information (data channel) that the transmitter wants to transmit can be transmitted through the Tx adaptation operation, and a reference signal can be set and transmitted for the purpose of determining the suitability of the Tx adaptation. Alternatively, the reference signal can be set and transmitted for the purpose of determining whether the information reported by the receiver in the second step is still valid, for example, for determining the effect of channel aging. In this case, the reference signal can be used to perform the Tx adaptation operation in a different manner from the information that the transmitter wants to transmit.

[0147] That is, the transmission of the signal to which the Tx adaptation is applied may be configured as a reference signal for transmission to a data channel and / or reception of the data channel. The data channel and the reference signal may be transmitted by different transmission schemes. Alternatively, some reference signals may be transmitted in the same manner as the data channel, and other reference signals may be transmitted in a manner different from the data channel. For example, when multiple reference signals are transmitted, different transmission schemes may be applied to each reference signal. The multiple reference signals may be of the same / different types. In addition, the reference signal may be set and transmitted for each path or path combination to be measured in order to measure information for each path or path combination. That is, the configuration of the reference signal may be determined or changed depending on the number of paths considered in the Tx adaptation.

[0148] The above Tx adaptation operation can be performed before the IFFT (inverse fast Fourier transform) operation.

[0149] The fourth and fifth step operations may be performed simultaneously or sequentially. For example, the fifth step operation may be performed after the fourth step operation, or the fifth step operation may be performed after the fourth step operation. That is, the fourth step information and / or signal may be transmitted through the same slot or the same symbol as the fifth step information and / or signal, or may be transmitted through different slots or different symbols.

[0150] As a sixth step operation, the receiver performs a path isolation operation on the signal (the information and / or signal of the fourth step and / or the information and / or signal of the fifth step). The path isolation operation may be performed after an FFT (fast Fourier transform) operation. The signal received through the path isolation operation may be divided into reception elements for each path or each path combination.

[0151] In the above path isolation operation, common information for two or more sub-carriers or two or more sub-bands can be obtained. For example, information for the two sub-carriers or sub-bands can be obtained through information transmitted through two or more sub-carriers or sub-bands or a reference signal. Alternatively, a single reception value can be obtained for information repeatedly transmitted through two or more sub-carriers or sub-bands. In this case, the above information can be in the form of a coded bit, a modulated symbol, etc. The above information can be expressed as a path-specific reception signal or path-specific reception information. In addition, the specific contents of the path-specific reception signal generation operation can be determined by the control information transmitted in the fourth step, the reference signal transmitted in the fourth step, and / or the reference signal transmitted in the fifth step. That is, the path-specific reception signal generation operation can be determined according to the information and / or signal of the fourth step and / or the information and / or signal of the fifth step.

[0152] As a seventh step operation, the receiver can secure actual channel gain by combining the received signals for each path. The combining operation can be performed after the co-phasing operation between the received signals for each path. The sixth and seventh steps can be performed simultaneously or sequentially.

[0153] As an 8th step operation, the receiver can obtain / extract information from the combined signal.

[0154] Fig. 13 illustrates an embodiment of the present disclosure. Fig. 13 illustrates an example of an inter-path combining method according to an embodiment of the present disclosure.

[0155] For convenience, this example assumes that the channel consists of two distinguishable paths and that the transmitter performs two repetitions of transmission (repetition factor = 2). This example illustrates the case where the signal element differentiation between paths and the inter-path signal combining operations are performed simultaneously.

[0156] The transmitter can repeatedly transmit the same signal twice at an interval called 'q'. In addition, the unit of repeated transmission can be set in various ways, such as RE / subcarrier, which is a basic unit of radio resources, or multiple RE / subcarriers, one or multiple PRBs, or one or multiple PRBGs. For example, if q=4, four pieces of information or signals X(0), X(1), X(2), X(3) mapped to four adjacent radio resources are repeatedly transmitted to another adjacent radio resource. At this time, X(n) can be information or signals mapped to each RE, information or signals mapped to each PRB(s), or signals mapped to PRB(s), or information or signals mapped to each PRBG(physical resource block)(s). The same can be true for X(4) to X(7), X(8) to X(11), etc., which are mapped to another adjacent radio resource and repeatedly transmitted.

[0157] At this time, the above-mentioned repeated transmission may be performed in a form in which the same type of signal is repeatedly transmitted, or it may be a form in which a frequency domain transformation operation is applied to the same signal and then transmitted separately. For example, the same signal may be transmitted through different sub-bands or sub-carriers after undergoing a phase change operation or a magnitude change operation at the transmission end. This can also be implemented in a form such as frequency selective precoding.

[0158] The receiver can perform signal element differentiation by path by receiving the repeatedly transmitted signal and de-spreading it using a path isolation code. As shown in Fig. 12, the isolation code can be determined based on the channel measurement of the receiver, by the transmission method notified by the transmitter, or by a combination of the two methods. The signal element differentiation by path is performed by multiplying the signal that has passed through the FFT by the path isolation code.

[0159] A) For each path component, perform summation on the frequency axis to produce a common component between frequencies;

[0160] B) Perform summation between different path components received in the sub-band or sub-carrier corresponding to each frequency.

[0161] It may include two summation processes such as the above. The two summation processes may be performed in the order of A)->B) or B)->A) depending on the implementation method of the receiver.

[0162] For example, for FFT signals Y0 (Y0(0), Y0(1), Y0(2), Y0(3)) and Y1 (Y1(0), Y1(1), Y1(2), Y1(3)), the receiver uses C, which is the code for each path isolation.0,i Wow C 1,i After performing the signal element distinction operation through , the combining operation between elements can be performed. For example, C 0,i For the elements to which (i=0, 1) is applied By applying can be obtained, C 1,i About these applied elements By applying can be obtained, class By combining This can be obtained by repeating the above actions. The back can be obtained. Or the sum C of the path isolation code for the signals Y0 and Y1 0,i + C 1,i It is possible to construct an inter-path combined received signal by performing a dispreading operation through .

[0163] Fig. 14 illustrates an embodiment of the present disclosure. Specifically, Fig. 9 illustrates a more specific embodiment of Fig. 8. In this example, the path isolation code consists of code that performs co-phasing for each path. That is, C 0,i For each frequency It is also given in the form (*: complex conjugator), C 1,i For each frequency It is also given in the form of C 0,i +C 1,i = becomes. This is identical to the general receiver structure that performs channel compensation after performing channel estimation for each frequency. In other words, this example can be understood as an example for a case where a receiver with the same structure as a general receiver is used. In addition, this example can be understood as an example for a case where the interval between frequency domain repetitions of the same signal is given as 'q'.

[0164] Below, we describe in more detail the case where the frequency domain repetition interval is 'q'. The channel gain for each path measured at frequency f can be expressed as follows.

[0165] (E1)

[0166] (E2)

[0167] In the above two formulas is each path Amplitude gain of signal components by is each path propagation delay, and represents the phase of the channel gain of each path at frequency f. j represents the imaginary unit (j^2=-1). When the above formulas (E1) and (E2) are applied to the receiver structure illustrated in Fig. 14, n, m, q, , , can be expressed as a formula. For example, C 0,i (i=0, 1) = About these applied elements By applying can be obtained, C 1,i = About these applied elements By applying can be obtained, class By combining This can be obtained. In the above formula, n and m are indicators used to express the frequency component f as a function of q, as shown in Fig. 14, where n is a positive integer greater than or equal to 0, and m is a positive integer (or non-negative integer) with a value greater than or equal to 0 and less than q. L is the number of repeated transmissions or repetition factor. If the above formula is re-expressed around 'q', it can be expressed as follows.

[0168] (E3)

[0169] (E4)

[0170]

[0171] (E5)

[0172] In the above formula, N0(f) and N1(f) represent the noise received together with the repeatedly transmitted signal X(f) in the low band and the noise received together with the repeatedly transmitted signal X(f) in the high band, respectively.

[0173] In the above formula, Q, C, is defined as follows:

[0174] , (E6)

[0175] , (E7)

[0176] (E8)

[0177] Equation (E3) gives the actual channel gain This means that the value can vary depending on the frequency. At this time ( : any integer with a value greater than or equal to 0)

[0178] (E9)

[0179] To be this, or

[0180] (E10)

[0181] To achieve this, adjust / set the q value, which is the interval between repetitions, according to the delay difference between paths and sub-carrier spacing.

[0182] (E11)

[0183] This allows the theoretical maximum channel gain to be obtained in all frequency domains. That is, the transmitter can transmit a signal based on repeated transmission according to the q value adjusted / set as above, and the receiver can receive the signal. As explained through Fig. 12, if the receiver transmits information about the path, particularly information about the path delay, path delay difference, or information necessary for calculating the q value, such as Channel Impulse Response (CIR), to the transmitter, the transmitter can calculate the 'q' value through Equation E9 or Equation E10. Alternatively, the receiver can directly calculate the q value and transmit it to the transmitter. Alternatively, the receiver can help the transmitter determine the q value by transmitting indirect information representing the delay characteristics of the path or the CIR to the transmitter. In addition, as explained through Fig. 12, the transmitter must transmit information about the q value or repetition pattern to the receiver. As explained above, this can be transmitted in the form of control information, reference signals, etc.

[0184] After the receiving operation of the receiver, the noise power may be amplified depending on the structure of the receiver. As illustrated in Fig. 14, in one example of the present disclosure, a general receiver structure is used, so that the noise power amplification phenomenon does not occur. More specifically, when the q value is adjusted according to (E9) and (E10) above,

[0185]

[0186]

[0187] This becomes the factor that determines the noise power at this time, which is a component that affects the size of N0 or N1, as follows: and is defined as

[0188] ,

[0189] Here,

[0190]

[0191]

[0192] This is it.

[0193] If we solve the above formula,

[0194] (E12)

[0195] (E13)

[0196] This becomes, for all frequencies

[0197] (E14)

[0198] It can be seen that the noise power decreases with the repetition factor.

[0199] Fig. 15 is an experimental example related to the performance of a method according to one embodiment of the present disclosure. Fig. 15 is an example of the effectiveness of the technique proposed in the present disclosure, showing the advantage of the technique proposed in the present disclosure over existing frequency domain diversity techniques.

[0200] Experiments were conducted for three different channel environments (Set A, Set B, and Set C). The channel environments are shown in Table 1.

[0201] [Table 1]

[0202]

[0203] The BER (bit error ratio) of the existing frequency diversity technique is expressed as 1501, the BER in the case of no diversity gain is expressed as 1503, and the BER of the technique according to an embodiment of the present disclosure is expressed as 1505. In the graphs below, the horizontal axis represents the reception SNR.

[0204] Since the sum of the power per path in the three sets considered above is constant, the same performance is shown for all considered channel environments when there is no diversity gain (1503).

[0205] In the case of frequency domain diversity (1501), it can be confirmed that the performance is affected by the delay difference between paths. This is because, as expressed in (E3), the actual channel gain is the delay difference between paths, i.e., Indicates that it is affected by .

[0206] In the case of the technique (1505) according to one embodiment of the present disclosure, it is shown that by optimizing the q value according to the delay difference between paths, the maximum channel gain can always be taken as the actual channel gain regardless of the delay difference between paths.

[0207] FIG. 13 and FIG. 14 are examples of a case where two repeated transmissions are performed, but the present disclosure is not limited thereto and can be extended to a general case where N repeated transmissions are performed.

[0208] Fig. 16 is an experimental example related to the performance of a method according to an embodiment of the present disclosure. Specifically, Fig. 16 is an example for performing 2xL(=N) repeated transmissions. Here, L is any integer greater than or equal to 1 or a natural number. In this case, the q value can be implemented in the same manner as in the case of two repeated transmissions. For example, a q value of the same size as in the case of two transmissions can be used. Alternatively, the q value can be adjusted and used as q / L. Fig. 16 shows that the channel gain that can be obtained in the two cases is the same. Fig. 14 is an example for a case where a channel is composed of two paths and that the same receiver structure as in the past can be used. However, the channel structure and receiver structure to which the present disclosure is applied are not limited thereto, and can be applied to a general channel having P paths. For example, if a channel is composed of five paths, the delay difference between all five paths can be considered (for example, the delay difference for each combination of the five paths can be considered).

[0209] (E15)

[0210] The channel gain can be optimized by setting the q value so that . In the above formula, , are the indexes that represent each path, Is and Considering the delay difference between paths expressed as It means the value. Since modulo operations are used to calculate the values, there are multiple The value can be set, and the above multiple Commonly available for all paths or multiple paths among values You can choose the value.

[0211] In addition, the receiver structure may be changed according to the path detection result and the request of the transmitter. For example, if communication is performed through a channel consisting of five paths, but only three of these paths are accurately detected, the q value optimization may be performed considering only the three paths. For example, if five paths are configured at the transmitter, but three of the five paths are detected in the first step described above, subsequent operations are performed considering the three paths. Alternatively, if all paths have been measured, but it is impossible to satisfy Equations E9 and E10 for all paths, the Q value may be determined considering only some paths. In other words, the q value optimization may be performed considering only three of the five paths, or the five paths may be divided into three path groups and the q value optimization may be performed for the three path groups. In addition, in this case, the receiver structure may be changed so that the reception operation is performed for the sum of the channel gains supported by each of the three paths or the three path groups.

[0212] Fig. 17 illustrates an example of a receiver structure according to an embodiment of the present disclosure. Fig. 17 is an example of a receiver structure when optimization is performed on some paths. When q-value optimization is performed by considering only Nd=2 paths out of a total of N=5 paths, the Nd value can be transmitted from the transmitter to the receiver or determined through a path detection operation of the receiver, and in this case, the receiver performs a reception operation considering only the Nd paths. The left figure of Fig. 17 is an example of the receiver operation for this. denotes the phase component of path n at frequency f, means the index of the paths reflected in determining the q value. If the q value is determined by considering all paths, becomes a value indicating all paths, and in this case, the operation of the receiving end becomes the same as that of the receiving end illustrated in Figs. 13 and 14.

[0213] Graph 1701 in Fig. 17 is an example of BER when the q value is set by considering only the two paths with the largest power gain in a channel consisting of a total of five paths. The solid line in 1701 is an example when the same receiver is used as before, and the dotted line in 1701 represents the BER when channel estimation for each path is measured considering only the two paths considered above and channel compensation is performed by the sum of the channels for each path. As can be seen in the graph, it can be seen that performing the reception operation by considering only the channel gain of the path used to calculate the q value supports better performance. The solid line in 1703 and the dotted line in 1703 are BER comparisons when using the same receiver structure as before in an environment using the existing frequency domain diversity technique and when performing only the channel compensation operation by considering only the channel gains of the four paths with the largest power gain, respectively. As can be seen in Fig. 17, it can be seen that performance can be improved by changing the receiver structure according to the path detection results. Therefore, the transmitter needs to transmit information about the path used to calculate the q value to the receiver. The transmission can be performed in the form of transmitting control information or transmitting a reference signal from which information about the path can be inferred. Graph 1705 shows the performance when the q value is determined by considering all five paths in the above example and when the receiver is configured by considering all five paths. Since all information about the channel is used for transmission and reception, optimal performance can be secured. Graph 1701 is an example of a case where the q value is determined using only two paths out of the five paths that constitute the channel.In this case, the solid line is an example of a case where information about the two paths is secured at the receiver and a receiver optimized for using the two paths is used, and the dotted line in 1703 is an example of a case where the information is not secured at the receiver and the receiver performs channel restoration using the entire channel information rather than the channel information for each path, as in Fig. 14. The solid line in graph 1703 is an example of the performance of the existing diversity technique, and the dotted line in 1703 is an example of the performance of an improved receiver that uses the same type of transmitter as the existing diversity technique but performs channel restoration by considering only two paths that show relatively high path gain at the receiver.

[0214] FIG. 13 and FIG. 14 are examples of a uniform repetition pattern in which a signal is repeated at regular intervals, but the technology presented in the present disclosure is not limited thereto and also includes non-uniform repetition in which the intervals between repetitions are not regular.

[0215] FIG. 18 is an example of a case where an embodiment of the present disclosure is applied to a non-uniform repetition pattern. Referring to FIG. 18, an embodiment of the present disclosure can be applied when q is fixed to 3 and symbols X(0), X(1), and X(2) are repeated. In addition, the q value is not fixed, and the q value is set to a different value for each repeated transmission, such as [6, 3] for X(0), [3, 6] for X(1), and [3, 3] for X(2), so that the q value can be set differently for each signal and each repeated transmission. As described above, an embodiment of the present disclosure can be applied even in a non-uniform repetition case where the q value changes. It can be confirmed through graphs 1801, 1805, 1807, and 1809 that additional performance gains can be obtained through the present disclosure even in non-uniform repetition.

[0216] Table 2 below describes various embodiments of the present disclosure. The various embodiments of the present disclosure described in Table 2 can be combined and applied in combination with the various embodiments of the present disclosure described above. In Table 2 below, Figures 1 to 8 correspond to Figures 19a to 19h, respectively. Figures 19a to 19h are drawings showing experimental examples for explaining one embodiment of the present disclosure.

[0217] [Table 2]

[0218]

[0219]

[0220]

[0221]

[0222]

[0223]

[0224]

[0225]

[0226]

[0227]

[0228]

[0229]

[0230]

[0231] FIG. 20 illustrates an example of the operation of a transmitting node according to one embodiment of the present disclosure. Various modifications may be made to the method illustrated in the flowchart of FIG. 20. For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0232] Referring to FIG. 20, in operation 2001 according to one embodiment, a transmitting node may transmit a reference signal (RS) to a receiving node.

[0233] In operation 2003 according to one embodiment, a transmitting node may receive path-related information (and / or path information) from a receiving node. For example, the path information and / or path-related information may be obtained from the receiving node based on an RS.

[0234] In operation 2005 according to one embodiment, the transmitting node may transmit a data channel and / or an RS based on path information and / or path-related information. For example, at least a portion of the data channel and / or the RS may be subject to Tx adaptation based on the path information and / or path-related information.

[0235] For more specific details on the operation of the transmitting node illustrated in Fig. 20, refer to the description of the above-described embodiment.

[0236] Figure 21 illustrates an example of the operation of a receiving node according to one embodiment of the present disclosure. Various modifications may be made to the method illustrated in the flowchart of Figure 21. For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0237] Referring to FIG. 21, in operation 2101 according to one embodiment, a receiving node may transmit a reference signal (RS) from a transmitting node.

[0238] In operation 2103 according to one embodiment, the receiving node may transmit path information and / or path-related information to the transmitting node. For example, the path information and / or path-related information may be obtained from the receiving node based on an RS.

[0239] In operation 2105 according to one embodiment, a receiving node may receive a data channel and / or RS from a transmitting node. For example, at least a portion of the data channel and / or RS may be subjected to Tx adaptation based on path information and / or path-related information.

[0240] In operation 2107 according to one embodiment, the receiving node may process the data channel and / or RS based on a path isolation code.

[0241] For more specific details on the operation of the receiving node illustrated in Fig. 21, refer to the description of the above-described embodiment.

[0242] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0243] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

[0244] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0245] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present disclosure.

[0246] In the specific embodiments of the present disclosure described above, components included in the embodiments are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0247] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art to which the present disclosure pertains that other modified embodiments based on the technical idea of ​​the present disclosure are possible. In addition, the above-described embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and another embodiment can be combined with each other to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure can be combined with each other to operate a base station and a terminal.

[0248] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0249] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0250] In addition, the method of the present disclosure may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence.

[0251] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

Claims

1. In a method performed by a first device in a communication system, A step of receiving feedback information related to a frequency domain interval for a frequency domain closed-loop transmission control technique from a second device; After receiving the above feedback information, a step of determining the frequency domain interval; and A method comprising the step of transmitting a data channel to the second device based on the frequency domain closed-loop transmission control technique associated with the determined frequency domain interval.

2. In paragraph 1, The above feedback information includes at least a portion of channel information related to a multi-path channel, The channel information includes at least one of path delay information per path related to the multi-path channel, information on a path delay difference between two or more paths, or channel impulse response (CIR) information, A method wherein the frequency domain interval is determined based on the channel information.

3. In paragraph 1, A method wherein the feedback information comprises one or more values corresponding to the frequency domain interval, and the one or more values are determined by the second device.

4. In paragraph 1, A method wherein the control channel scheduling the data channel or the configuration information for setting the radio resources related to the data channel includes information indicating the determined frequency domain interval.

5. In paragraph 1, The above frequency domain interval is based on a combination of one or more of RE (resource element) units, RB (resource block) units, or RBG (resource block group) units, The frequency resources to which the above data channels are mapped are determined by repeating a set of frequency resources the number of times they are repeated in the frequency domain. The above frequency domain interval is the interval between two adjacent frequency resource units among repeated frequency resource units, A method wherein the above one frequency resource set includes one or more combinations of one or more REs, one or more RBs, or one or more RBGs.

6. In paragraph 1, A method comprising the step of transmitting settings associated with the use of the above frequency domain closed-loop transmission control technique.

7. In the first device of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Receiving feedback information related to frequency domain spacing for a frequency domain closed-loop transmission control technique from a second device; After receiving the above feedback information, determining the frequency domain interval; and A first device configured to transmit a data channel to the second device based on the frequency domain closed-loop transmission control technique using the determined frequency domain interval.

8. In paragraph 7, The above feedback information includes at least a portion of channel information related to a multi-path channel, The channel information includes at least one of path delay information per path related to the multi-path channel, information on a path delay difference between two or more paths, or channel impulse response (CIR) information, A first device, wherein the frequency domain interval is determined based on the channel information.

9. In paragraph 7, A first device, wherein the feedback information includes one or more values corresponding to the frequency domain interval determined by the second device.

10. In paragraph 7, A first device, wherein the configuration information for setting a control channel for scheduling the data channel or a wireless resource related to the data channel includes information indicating the determined frequency domain interval.

11. In paragraph 7, The above frequency domain interval is based on a combination of one or more of RE (resource element) units, RB (resource block) units, or RBG (resource block group) units, The frequency resources to which the above data channels are mapped are determined by repeating a set of frequency resources the number of times they are repeated in the frequency domain. The above frequency domain interval is the interval between two adjacent frequency resource units among repeated frequency resource units, A first device, wherein the one set of frequency resources includes one or more combinations of one or more REs, one or more RBs, or one or more RBGs.

12. In paragraph 7, A first device, wherein the processor is configured to transmit settings related to the use of the frequency domain closed-loop transmission control technique.

13. In a method performed by a second device in a communication system, A step of receiving one or more RS (reference signals) from a first device; A step of determining feedback information related to a frequency domain interval for a frequency domain closed loop transmission control technique based on the one or more RSs; A step of transmitting the above feedback information to a first device; and A method comprising the step of receiving a data channel to which the frequency domain closed-loop transmission control technique based on the frequency domain interval is applied from the second device.

14. In paragraph 13, The feedback information includes at least a portion of channel information related to a multi-path channel or one or more values corresponding to the frequency domain interval determined by the second device, The channel information includes at least one of path delay information per path related to the multi-path channel, information on a path delay difference between two or more paths, or channel impulse response (CIR) information, A method wherein a control channel for scheduling the data channel includes information indicating the frequency domain interval.

15. In the second device of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Receive one or more RS (reference signals) from the first device; Determining feedback information related to a frequency domain interval for a frequency domain closed-loop transmission control technique based on one or more RSs; Transmitting the above feedback information to the first device; and A second device configured to receive a data channel to which the frequency domain closed-loop transmission control technique based on the frequency domain interval is applied from the second device.

Images