Method and device for performing improved beam tracking in next-generation … — Samsung Electronics Co., Ltd (US12683659B2)

ABSTRACT

Abstract

The present disclosure relates to a 6G communication system for accomplishing ultra-low delay time and a data transmission rate higher than that of 4G and 5G communication systems. According to embodiments of the present disclosure, a base station can match (or map), to a channel state information-reference signal (CSI-RS), beams having a high probability of being selected as the beam with the best performance at the location of a terminal, and can provide the CSI-RS to the terminal. Therefore, the possibility of the inclusion of the beams with the best performance from among the beams corresponding to the CSI-RS can be increased. Thus, beam tracking with more improved performance can be performed when a beamforming technology is operated in millimeter wave and terahertz bands, or ultrahigh frequency bands or higher.

Description

PRIORITY

This application is a National Phase Entry of PCT International Application No. PCT/KR2021/018369, which was filed on Dec. 6, 2021, and claims priority to Korean Patent Application No. 10-2020-0171941, which was filed on Dec. 10, 2020, the entire content of each of which is incorporated herein by reference.

TECHNICAL FIELD

The disclosure relates to operations of a terminal and a base station in a next-generation wireless communication system. In particular, the disclosure relates to a beam tracking method with improved performance, in performing signal transmission/reception between a terminal and a base station by applying beamforming technology in a system based on ultra-high frequency bands such as millimeter wave (mmWave) (e.g., 28 GHz, terahertz (THz), or higher ultra-high frequency bands), and an apparatus capable of performing the same.

BACKGROUND ART

A review of the development of wireless communication from generation to generation shows that the development has mostly been directed to technologies for services targeting humans, such as voice-based services, multimedia services, and data services. It is expected that connected devices which are exponentially increasing after commercialization of 5th generation (5G) communication systems will be connected to communication networks. Examples of things connected to networks may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various formfactors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6G era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems. 6G communication systems, which are expected to be implemented approximately by 2030, will have a maximum transmission rate of tera (1,000 giga)-level bps and a radio latency of 100 μsec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof.

In order to accomplish such a high data transmission rate and an ultra-low latency, it has been considered to implement 6G communication systems in a terahertz band (for example, 95 GHz to 3 THz bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in mmWave bands introduced in 5G, a technology capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, multiantenna transmission technologies including radio frequency (RF) elements, antennas, novel waveforms having a better coverage than OFDM, beamforming and massive MIMO, full dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).

Moreover, in order to improve the frequency efficiencies and system networks, the following technologies have been developed for 6G communication systems: a full-duplex technology for enabling an uplink (UE transmission) and a downlink (node B transmission) to simultaneously use the same frequency resource at the same time; a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner; a network structure innovation technology for supporting mobile nodes B and the like and enabling network operation optimization and automation and the like; a dynamic spectrum sharing technology though collision avoidance based on spectrum use prediction, an artificial intelligence (AI)-based communication technology for implementing system optimization by using AI from the technology design step and internalizing end-to-end AI support functions; and a next-generation distributed computing technology for implementing a service having a complexity that exceeds the limit of UE computing ability by using super-high-performance communication and computing resources (mobile edge computing (MEC), clouds, and the like). In addition, attempts have been continuously made to further enhance connectivity between devices, further optimize networks, promote software implementation of network entities, and increase the openness of wireless communication through design of new protocols to be used in 6G communication systems, development of mechanisms for implementation of hardware-based security environments and secure use of data, and development of technologies for privacy maintenance methods.

It is expected that such research and development of 6G communication systems will enable the next hyper-connected experience in new dimensions through the hyper-connectivity of 6G communication systems that covers both connections between things and connections between humans and things. Particularly, it is expected that services such as truly immersive XR, high-fidelity mobile holograms, and digital replicas could be provided through 6G communication systems. In addition, with enhanced security and reliability, services such as remote surgery, industrial automation, and emergency response will be provided through 6G communication systems, and thus these services will be applied to various fields including industrial, medical, automobile, and home appliance fields.

Meanwhile, research on the 6G communication system or next-generation wireless communication system as described above pays attention to, particularly, beamforming technology and a method for enabling the beamforming technology to be operated more effectively, as a method for solving the problem of a reduction in the coverage of a base station that may occur during signal transmission/reception in millimeter wave and terahertz bands, or higher ultra-high frequency bands and communication service quality degradation according thereto.

DISCLOSURE OF INVENTION

Technical Problem

As described above, in a 6G communication system or a next-generation wireless communication system to which the disclosure can be applied, signal transmission/reception in millimeter wave and terahertz (THz) bands, or higher ultra-high frequency bands is considered to ensure a higher signal transmission rate. On the other hand, the degree of signal attenuation by distance increases as a higher frequency band is used, and thus a reduction in the coverage of the base station due to signal attenuation is unavoidable. In order to solve this coverage reduction problem, in a 6G communication system or a next-generation wireless communication system to which the disclosure can be applied, a method for applying a beamforming technology to amplify signal strength so as to perform signal transmission/reception between a terminal and a base station can be considered. However, even when signal transmission/reception is performed between a terminal and a base station based on the beamforming technology, the signal strength amplification effect of the beamforming technology may be rapidly attenuated according to changes in the surrounding communication environment, such as movement of the terminal. That is, in the ultra-high frequency band, the beamforming technology may not be effectively operated depending on the communication environment. In addition, since it may be difficult to select an appropriate beam in a communication environment in which a large number of beams are used, the beamforming technique may not be effectively operated. Therefore, in a 6G communication system or a next-generation wireless communication system to which the disclosure can be applied, there is a need to devise a beam tracking (or beam management) method enabling determining the best-performing beam, continuously tracking changes in the beam, and exchanging information on the state of a beam between a terminal and a base station, so as to perform more stable and efficient operation of the beamforming technology:

Solution to Problem

In order to solve the above problems, according to an embodiment of the disclosure, a method by a terminal in a communication system is provided. The method by a terminal includes receiving a message including cluster information from a first base station, identifying whether a cluster corresponding to the location of the terminal is changed, based on the cluster information and location information of the terminal, and in case that the cluster is changed, transmitting a channel state information (CSI) report including information about the changed cluster to the first base station, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

Further, according to an embodiment of the disclosure, a method by a first base station in a communication system is provided. The method by a first base station includes transmitting a message including cluster information to a terminal, in case that a cluster corresponding to the location of the terminal is changed, receiving a channel state information (CSI) report including information about the changed cluster from the terminal, identifying at least one beam corresponding to a channel state information-reference signal (CSI-RS) based on the information about the changed cluster, and transmitting the CSI-RS to the terminal based on the identified at least one beam, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

In addition, according to an embodiment of the disclosure, a terminal of a communication system is provided. The terminal includes a transceiver, and a controller connected to the transceiver and configured to receive a message including cluster information from a first base station, identify whether a cluster corresponding to the location of the terminal is changed, based on the cluster information and location information of the terminal, and in case that the cluster is changed, transmit a channel state information (CSI) report including information about the changed cluster to the first base station, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

In addition, according to an embodiment of the disclosure, a first base station of a communication system is provided. The first base station includes a transceiver, and a controller connected to the transceiver and configured to transmit a message including cluster information to a terminal, in case that the cluster corresponding to the location of the terminal is changed, receive a channel state information (CSI) report including information about the changed cluster from the terminal, identify at least one beam corresponding to a channel state information-reference signal (CSI-RS) based on the information about the changed cluster, and transmit the CSI-RS to the terminal based on the identified at least one beam, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

Advantageous Effects of Invention

According to the disclosure, there is provided a method for managing beams for each cluster by clustering a location-specific beam pattern by a base station and sharing a result of the clustering with a terminal. Accordingly, the base station may match (or map) a beam having a high probability of being selected as the best performing beam to a channel state information-reference signal (CSI-RS) based on a beam pattern corresponding to a cluster to which the location of a terminal belongs and transmit this CSI-RS to the terminal, to thereby obtain the effect of performing beam tracking with more improved performance.

Furthermore, according to an embodiment proposed in the disclosure, beam management is enabled for each cluster, and thus even in communication having a large number of beams used (e.g., terahertz (THz) communication, vehicle communication, or RIS-based communication), a beam with good performance to be used for signal transmission and reception can be determined more quickly.

Advantageous effects obtainable from the disclosure may not be limited to the above-mentioned effects, and other effects which are not mentioned may be clearly understood, through the following descriptions, by those skilled in the art to which the disclosure pertains.

BRIEF DESCRIPTION OF DRAWINGS

The above and other objectives, features and advantages of the disclosure will become clearer through the following description of embodiments of the disclosure with reference to the accompanying drawings:

FIG. 1 illustrates the structure of a new radio (NR or 5G) system according to the disclosure;

FIG. 2 illustrates the structure of a next-generation wireless communication system according to the disclosure;

FIG. 3 illustrates the structure of a system in which a terminal and a base station transmit or receive signals based on a beamforming technology in a next-generation wireless communication system according to the disclosure;

FIG. 4 A illustrates a process in which a terminal and a base station perform downlink transmission beam adjustment according to the disclosure;

FIG. 4 B illustrates a process in which a terminal and a base station perform downlink reception beam adjustment according to the disclosure;

FIG. 5 illustrates a beam indication method in a next-generation wireless communication system according to the disclosure;

FIG. 6 illustrates a process of performing beam tracking according to an embodiment of the disclosure;

FIG. 7 illustrates a process of performing beam tracking according to an embodiment of the disclosure;

FIG. 8 illustrates an example of determining a beam corresponding to a CSI-RS in beam tracking according to an embodiment of the disclosure;

FIG. 9 illustrates an example of determining a beam corresponding to a CSI-RS in beam tracking according to an embodiment of the disclosure;

FIG. 10 A illustrates an example of a method for clustering a location-specific beam pattern by a base station according to an embodiment of the disclosure;

FIG. 10 B illustrates an example of a method for clustering a location-specific beam pattern by a base station according to an embodiment of the disclosure;

FIG. 11 illustrates a sequence of a process in which a terminal transmits location information and information on a best beam at a corresponding location to a base station according to an embodiment of the disclosure;

FIG. 12 illustrates a sequence of a process in which a terminal transmits a list of signal st

PRIORITY

This application is a National Phase Entry of PCT International Application No. PCT/KR2021/018369, which was filed on Dec. 6, 2021, and claims priority to Korean Patent Application No. 10-2020-0171941, which was filed on Dec. 10, 2020, the entire content of each of which is incorporated herein by reference.

TECHNICAL FIELD

The disclosure relates to operations of a terminal and a base station in a next-generation wireless communication system. In particular, the disclosure relates to a beam tracking method with improved performance, in performing signal transmission/reception between a terminal and a base station by applying beamforming technology in a system based on ultra-high frequency bands such as millimeter wave (mmWave) (e.g., 28 GHz, terahertz (THz), or higher ultra-high frequency bands), and an apparatus capable of performing the same.

BACKGROUND ART

A review of the development of wireless communication from generation to generation shows that the development has mostly been directed to technologies for services targeting humans, such as voice-based services, multimedia services, and data services. It is expected that connected devices which are exponentially increasing after commercialization of 5th generation (5G) communication systems will be connected to communication networks. Examples of things connected to networks may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various formfactors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6G era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems. 6G communication systems, which are expected to be implemented approximately by 2030, will have a maximum transmission rate of tera (1,000 giga)-level bps and a radio latency of 100 μsec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof.

In order to accomplish such a high data transmission rate and an ultra-low latency, it has been considered to implement 6G communication systems in a terahertz band (for example, 95 GHz to 3 THz bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in mmWave bands introduced in 5G, a technology capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, multiantenna transmission technologies including radio frequency (RF) elements, antennas, novel waveforms having a better coverage than OFDM, beamforming and massive MIMO, full dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).

Moreover, in order to improve the frequency efficiencies and system networks, the following technologies have been developed for 6G communication systems: a full-duplex technology for enabling an uplink (UE transmission) and a downlink (node B transmission) to simultaneously use the same frequency resource at the same time; a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner; a network structure innovation technology for supporting mobile nodes B and the like and enabling network operation optimization and automation and the like; a dynamic spectrum sharing technology though collision avoidance based on spectrum use prediction, an artificial intelligence (AI)-based communication technology for implementing system optimization by using AI from the technology design step and internalizing end-to-end AI support functions; and a next-generation distributed computing technology for implementing a service having a complexity that exceeds the limit of UE computing ability by using super-high-performance communication and computing resources (mobile edge computing (MEC), clouds, and the like). In addition, attempts have been continuously made to further enhance connectivity between devices, further optimize networks, promote software implementation of network entities, and increase the openness of wireless communication through design of new protocols to be used in 6G communication systems, development of mechanisms for implementation of hardware-based security environments and secure use of data, and development of technologies for privacy maintenance methods.

It is expected that such research and development of 6G communication systems will enable the next hyper-connected experience in new dimensions through the hyper-connectivity of 6G communication systems that covers both connections between things and connections between humans and things. Particularly, it is expected that services such as truly immersive XR, high-fidelity mobile holograms, and digital replicas could be provided through 6G communication systems. In addition, with enhanced security and reliability, services such as remote surgery, industrial automation, and emergency response will be provided through 6G communication systems, and thus these services will be applied to various fields including industrial, medical, automobile, and home appliance fields.

Meanwhile, research on the 6G communication system or next-generation wireless communication system as described above pays attention to, particularly, beamforming technology and a method for enabling the beamforming technology to be operated more effectively, as a method for solving the problem of a reduction in the coverage of a base station that may occur during signal transmission/reception in millimeter wave and terahertz bands, or higher ultra-high frequency bands and communication service quality degradation according thereto.

DISCLOSURE OF INVENTION

Technical Problem

As described above, in a 6G communication system or a next-generation wireless communication system to which the disclosure can be applied, signal transmission/reception in millimeter wave and terahertz (THz) bands, or higher ultra-high frequency bands is considered to ensure a higher signal transmission rate. On the other hand, the degree of signal attenuation by distance increases as a higher frequency band is used, and thus a reduction in the coverage of the base station due to signal attenuation is unavoidable. In order to solve this coverage reduction problem, in a 6G communication system or a next-generation wireless communication system to which the disclosure can be applied, a method for applying a beamforming technology to amplify signal strength so as to perform signal transmission/reception between a terminal and a base station can be considered. However, even when signal transmission/reception is performed between a terminal and a base station based on the beamforming technology, the signal strength amplification effect of the beamforming technology may be rapidly attenuated according to changes in the surrounding communication environment, such as movement of the terminal. That is, in the ultra-high frequency band, the beamforming technology may not be effectively operated depending on the communication environment. In addition, since it may be difficult to select an appropriate beam in a communication environment in which a large number of beams are used, the beamforming technique may not be effectively operated. Therefore, in a 6G communication system or a next-generation wireless communication system to which the disclosure can be applied, there is a need to devise a beam tracking (or beam management) method enabling determining the best-performing beam, continuously tracking changes in the beam, and exchanging information on the state of a beam between a terminal and a base station, so as to perform more stable and efficient operation of the beamforming technology:

Solution to Problem

In order to solve the above problems, according to an embodiment of the disclosure, a method by a terminal in a communication system is provided. The method by a terminal includes receiving a message including cluster information from a first base station, identifying whether a cluster corresponding to the location of the terminal is changed, based on the cluster information and location information of the terminal, and in case that the cluster is changed, transmitting a channel state information (CSI) report including information about the changed cluster to the first base station, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

Further, according to an embodiment of the disclosure, a method by a first base station in a communication system is provided. The method by a first base station includes transmitting a message including cluster information to a terminal, in case that a cluster corresponding to the location of the terminal is changed, receiving a channel state information (CSI) report including information about the changed cluster from the terminal, identifying at least one beam corresponding to a channel state information-reference signal (CSI-RS) based on the information about the changed cluster, and transmitting the CSI-RS to the terminal based on the identified at least one beam, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

In addition, according to an embodiment of the disclosure, a terminal of a communication system is provided. The terminal includes a transceiver, and a controller connected to the transceiver and configured to receive a message including cluster information from a first base station, identify whether a cluster corresponding to the location of the terminal is changed, based on the cluster information and location information of the terminal, and in case that the cluster is changed, transmit a channel state information (CSI) report including information about the changed cluster to the first base station, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

In addition, according to an embodiment of the disclosure, a first base station of a communication system is provided. The first base station includes a transceiver, and a controller connected to the transceiver and configured to transmit a message including cluster information to a terminal, in case that the cluster corresponding to the location of the terminal is changed, receive a channel state information (CSI) report including information about the changed cluster from the terminal, identify at least one beam corresponding to a channel state information-reference signal (CSI-RS) based on the information about the changed cluster, and transmit the CSI-RS to the terminal based on the identified at least one beam, wherein the cluster information includes information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

Advantageous Effects of Invention

According to the disclosure, there is provided a method for managing beams for each cluster by clustering a location-specific beam pattern by a base station and sharing a result of the clustering with a terminal. Accordingly, the base station may match (or map) a beam having a high probability of being selected as the best performing beam to a channel state information-reference signal (CSI-RS) based on a beam pattern corresponding to a cluster to which the location of a terminal belongs and transmit this CSI-RS to the terminal, to thereby obtain the effect of performing beam tracking with more improved performance.

Furthermore, according to an embodiment proposed in the disclosure, beam management is enabled for each cluster, and thus even in communication having a large number of beams used (e.g., terahertz (THz) communication, vehicle communication, or RIS-based communication), a beam with good performance to be used for signal transmission and reception can be determined more quickly.

Advantageous effects obtainable from the disclosure may not be limited to the above-mentioned effects, and other effects which are not mentioned may be clearly understood, through the following descriptions, by those skilled in the art to which the disclosure pertains.

BRIEF DESCRIPTION OF DRAWINGS

The above and other objectives, features and advantages of the disclosure will become clearer through the following description of embodiments of the disclosure with reference to the accompanying drawings:

FIG. 1 illustrates the structure of a new radio (NR or 5G) system according to the disclosure;

FIG. 2 illustrates the structure of a next-generation wireless communication system according to the disclosure;

FIG. 3 illustrates the structure of a system in which a terminal and a base station transmit or receive signals based on a beamforming technology in a next-generation wireless communication system according to the disclosure;

FIG. 4 A illustrates a process in which a terminal and a base station perform downlink transmission beam adjustment according to the disclosure;

FIG. 4 B illustrates a process in which a terminal and a base station perform downlink reception beam adjustment according to the disclosure;

FIG. 5 illustrates a beam indication method in a next-generation wireless communication system according to the disclosure;

FIG. 6 illustrates a process of performing beam tracking according to an embodiment of the disclosure;

FIG. 7 illustrates a process of performing beam tracking according to an embodiment of the disclosure;

FIG. 8 illustrates an example of determining a beam corresponding to a CSI-RS in beam tracking according to an embodiment of the disclosure;

FIG. 9 illustrates an example of determining a beam corresponding to a CSI-RS in beam tracking according to an embodiment of the disclosure;

FIG. 10 A illustrates an example of a method for clustering a location-specific beam pattern by a base station according to an embodiment of the disclosure;

FIG. 10 B illustrates an example of a method for clustering a location-specific beam pattern by a base station according to an embodiment of the disclosure;

FIG. 11 illustrates a sequence of a process in which a terminal transmits location information and information on a best beam at a corresponding location to a base station according to an embodiment of the disclosure;

FIG. 12 illustrates a sequence of a process in which a terminal transmits a list of signal strength measurement results of a reference signal and information on a best beam at a corresponding location to a base station according to an embodiment of the disclosure;

FIG. 13 illustrates a sequence of a process in which a base station identifies a location-specific beam pattern based on location information of a terminal and information on a best beam, and clusters the beam pattern according to an embodiment of the disclosure;

FIG. 14 illustrates an overall flow of a process in which a base station acquires cluster information according to an embodiment of the disclosure;

FIG. 15 illustrates a sequence of a process in which a terminal performs beam tracking based on location information and cluster information which is received from a base station according to an embodiment of the disclosure;

FIG. 16 illustrates a sequence of a process in which a base station changes a beam corresponding to a CSI-RS according to an embodiment of the disclosure;

FIG. 17 illustrates an overall flow in which a terminal and a base station perform beam tracking based on cluster information according to an embodiment of the disclosure;

FIG. 18 illustrates the structure of a terminal according to embodiments of the disclosure; and

FIG. 19 illustrates the structure of a base station according to embodiments of the disclosure.

MODE FOR THE INVENTION

Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings.

In describing embodiments of the disclosure, descriptions related to technical contents well-known in the art and not associated directly with the disclosure will be omitted.

Such an omission of unnecessary descriptions is intended to prevent obscuring of the main idea of the disclosure and more clearly transfer the main idea.

For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted, or schematically illustrated. Further, the size of each element does not completely reflect the actual size. In the drawings, identical or corresponding elements are provided with identical reference numerals.

The advantages and features of the disclosure and ways to achieve them will be apparent by making reference to embodiments as described below in detail in conjunction with the accompanying drawings.

However, the disclosure is not limited to the embodiments set forth below, but may be implemented in various different forms. The following embodiments are provided only to completely disclose the disclosure and inform those skilled in the art of the scope of the disclosure, and the disclosure is defined only by the scope of the appended claims. Throughout the specification, the same or like reference numerals designate the same or like elements.

Herein, it will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

Furthermore, each block of the flowchart illustrations may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of the order. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

As used in embodiments of the disclosure, the “unit” refers to a software element or a hardware element, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), which performs a predetermined function. However, the “unit” does not always have a meaning limited to software or hardware. The “unit” may be constructed either to be stored in an addressable storage medium or to execute one or more processors. Therefore, the “unit” includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, properties, procedures, sub-routines, segments of a program code, drivers, firmware, micro-codes, circuits, data, database, data structures, tables, arrays, and parameters. The elements and functions provided by the “unit” may be either combined into a smaller number of elements, or a “unit”, or divided into a larger number of elements, or a “unit”. Moreover, the elements and “units” or may be implemented to reproduce one or more CPUs within a device or a security multimedia card. In the following description, some of terms and names defined in the 3rd generation partnership project (3GPP) standards (standards for 5G, NR, long term evolution (LTE), or similar systems) may be used for the convenience of description. Moreover, terms and names newly defined in a next-generation communication system (e.g., 6G or beyond 5G system) to which the disclosure is applicable or employed in the existing communication systems may also be used. The use of terms and names is not limited by the terms and names of the disclosure, and the disclosure may be applied in the same way to systems that conform other standards and may be changed into other forms without departing from the technical idea of the disclosure. In an embodiment of the disclosure, it is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

In an embodiment of the disclosure, the terms including an ordinal number, such as expressions “a first” and “a second” may be used to described various elements, but the corresponding elements should not be limited by such terms. These terms are used merely to distinguish between one element and any other element. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element without departing from the scope of the disclosure.

In an embodiment of the disclosure, the term “and/or” includes any one of any combination of multiple relevant items enumerated.

The terms used in the disclosure are merely used to describe specific embodiments, and are not intended to limit the disclosure. A singular expression may include a plural expression unless they are definitely different in a context. As used herein, the expression “include” or “have” are intended to specify the existence of mentioned features, numbers, steps, operations, elements, components, or combinations thereof, and should be construed as not precluding the possible existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

As used in an embodiment of the disclosure, the phrases “associated with” and “associated therewith”, as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like.

As used in the disclosure, the expression “greater than” or “less than” is used to determine whether a specific condition is satisfied or fulfilled, but this is intended only to illustrate an example and does not exclude “greater than or equal to” or “equal to or less than”. A condition indicated by the expression “greater than or equal to” may be replaced with a condition indicated by “greater than”, a condition indicated by the expression “equal to or less than” may be replaced with a condition indicated by “less than”, and a condition indicated by “greater than and equal to or less than” may be replaced with a condition indicated by “greater than and less than”.

Before the detailed description of the disclosure, examples of construable meanings of some terms used herein are given below. However, it should be noted that the terms are not limited to the examples of the construable meanings as given below.

In the disclosure, a terminal (or communication terminal) is an entity that communicates with a base station or any other terminal, and may be referred to as a node, a user equipment (UE), a next generation UE (NG UE), a mobile station (MS), a device, a terminal, or the like. The terminal may include at least one of a smartphone, a tablet personal computer (PC), a mobile phone, a video phone, an electronic book reader, a desktop PC, a laptop PC, a netbook computer, a personal digital assistant (PDA), a portable multimedia player (PMP), an MP3 player, a medical device, a camera, and a wearable device. Also, the terminal may include at least one of a television, a digital video disk (DVD) player, an audio, a refrigerator, an air conditioner, a vacuum cleaner, an oven, a microwave oven, a washing machine, an air purifier, a set-top box, a home automation control panel, a security control panel, a media box, a game console, an electronic dictionary, an electronic key, a camcorder, and an electronic photo frame. In addition, the terminal may include at least one of various medical devices (e.g., various portable medical measuring devices (blood glucose monitoring device, heart rate monitoring device, blood pressure measuring device, body temperature measuring device, etc.), magnetic resonance angiography (MRA), magnetic resonance imaging (MRI), computed tomography (CT) machine, ultrasonic machine, etc.), a navigation device, a global positioning system (GPS) receiver, an event data recorder (EDR), a flight data recorder (FDR), a vehicle infotainment device, electronic equipment for a ship (e.g., ship navigation device, gyro-compass, etc.), avionics, a security device, an automobile head unit, a home or industrial robot, a drone, an automatic teller's machine (ATM) in banks, point of sales (POS) in a shop, or Internet of things devices (e.g., light bulb, various sensors, electric or gas meter, sprinkler device, fire alarm, thermostat, streetlamp, toaster, sporting goods, hot water tank, heater, boiler, etc.). However, the disclosure is not limited by the above examples, and the terminal may also be referred to by terms having the same or similar meanings.

In the disclosure, a base station is an entity that communicates with terminals and allocates resources to the terminals, and may be referred to as a base station (BS), a Node B (NB), a next generation radio access network (NG RAN), an access point (AP), a transmission reception point (TRP), a wireless access unit, a base station controller, a node on a network, or the like. Alternatively, according to function split, the base station may be referred to as a central unit (CU) or a distributed unit (DU). However, the disclosure is not limited by the above examples, and the base station may also be referred to by terms having the same or similar meanings.

In the disclosure, the term “high level message” may be referred to as “high level signal”, “high level signaling”, “high layer signaling”, “upper layer signaling”, or “radio resource control (RRC) message”, and the disclosure is not limited by them and the term may also be referred to as other terms having the same or like meaning.

In addition, in the embodiments of the disclosure, the best beam (or best beams) may imply two beams in one beam pair (or beam pairs) configured by beams at a transmitter side or receiver side, the two beams configured by one beam at the transmitter side and one beam at the receiver side and measured to have the best performance among beams usable by the transmitter side and the receiver side. That is, according to an embodiment of the disclosure, the best beam may imply a best transmission beam at the transmitter side or a best reception beam at the receiver side. Meanwhile, in the disclosure, a beam with good performance may imply that the received signal strength (e.g., reference signal received power (RSRP)) for the beam is equal to or greater than a predetermined threshold value, or that the channel quality for the beam is good. In addition, in the embodiments of the disclosure, the best beam may generally imply a transmission beam with the best performance, used by a base station to communicate with a terminal, within the best beam pair measured according to the reference signal transmitted by the base station, or may imply the top-ranked N beams in terms of performance. Further, the disclosure is not limited thereto, and may refer to various examples of the best beam described in the embodiments of the disclosure.

FIG. 1 illustrates the structure of a new radio (NR or 5G) system according to the disclosure. Referring to FIG. 1 , as shown in the drawing, a radio access network of the NR system may include an NR base station (new radio Node B or NR gNB) 1 - 10 and an NR core network 1 - 05 . An NR terminal (or NR UE) 1 - 15 may access an external network through the NR gNB 1 - 10 and the NR core network 1 - 05 .

In FIG. 1 , the NR gNB 1 - 10 corresponds to an evolved Node B (eNB) of a conventional LTE system. The NR gNB may be connected to an NR UE 1 - 15 through a radio channel and may provide better service than a conventional node B. Since all user traffic is served through a shared channel in the NR system, a device for collecting and scheduling status information of buffer statuses, available transmission power statuses, and channel statuses of UEs is required, and the NR gNB 1 - 10 performs the above-described function. One NR gNB generally controls a plurality of cells. In the NR system, data transmission/reception may be performed based on a bandwidth equal to or wider than the conventional maximum bandwidth in order to implement super-high-speed data transmission compared to the LTE system and may apply orthogonal frequency division multiplexing (OFDM) as radio access technology. Further, a modulation scheme and an adaptive modulation and coding (AMC) scheme of determining a channel coding rate are applied in accordance with a channel status of the UE. The NR core network 1 - 05 may perform a function of supporting mobility, configuring a bearer, configuring a QoS, and the like. The NR core network is a device for performing a function of managing the mobility of the UE and various control functions, and may be connected to a plurality of gNBs. Further, the NR system may be linked to the conventional LTE system, and the NR core network 1 - 05 may be connected to a mobility management entity (MME) 1 - 25 through a network interface. The MIME 1 - 25 may be connected to an LTE eNB 1 - 30 , which is a base station of the LTE system.

Meanwhile, in the NR system according to the disclosure, blind decoding is performed in a specific time and frequency domain to receive a PDCCH including DCI. A base station may configure a control resource set (CORESET) and a search space in a terminal through a higher-level message in order to provide a time and a frequency domain, and mapping method for the terminal to perform blind decoding. The base station may configure up to 3 CORESETs and up to 10 search spaces for each bandwidth part (BWP) configured in the terminal. As an example, the base station and the terminal may transmit and receive signaling information as shown in [Table 1] below to deliver information on CORESET.

TABLE 1

ControlResourceSet information element

-- ASN1START

-- TAG-CONTROLRESOURCESET-START

ControlResourceSet ::=

SEQUENCE {

 controlResourceSetId

 ControlResourceSetId,

 frequencyDomainResources

 BIT STRING (SIZE (45)),

 duration

 INTEGER (1..maxCoReSetDuration),

 cce-REG-MappingType

  CHOICE {

  interleaved

  SEQUENCE {

   reg-BundleSize

   ENUMERATED {n2, n3, n6},

   interleaverSize

   ENUMERATED {n2, n3, n6},

   shiftIndex

INTEGER(0..maxNrofPhysicalResourceBlocks−1)

    OPTIONAL -- Need S

  },

  nonInterleaved

  NULL

 },

 precoderGranularity

    ENUMERATED {sameAsREG-bundle,

allContiguousRBs},

 tci-StatesPDCCH-ToAddList

 SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF

TCI-StateId OPTIONAL, -- Cond NotSIB1-initialBWP

 tci-StatesPDCCH-ToReleaseList

 SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF

TCI-StateId OPTIONAL, -- Cond NotSIB1-initialBWP

 tci-PresentInDCI

     ENUMERATED {enabled}

OPTIONAL, -- Need S

 pdcch-DMRS-ScramblingID

      INTEGER (0..65535)

OPTIONAL, -- Need S

 ...

}

-- TAG-CONTROLRESOURCESET-STOP

-- ASN1STOP

The signaling information ControlResourceSet includes information on each CORESET. Information included in the signaling information ControlResourceSet may have the following meanings.

controlResourceSetId: indicates the CORESET index. frequency Domain Resources: indicates frequency resource information of a CORESET.

With respect to all PRBs included in a BWP, RB groups each including 6 RBs are made, and whether each of the RB groups is included in a CORESET frequency resource is indicated by 1 bit. (1: included in CORESET, 0: not included in CORESET)

duration: symbol level time resource information of a CORESET. The information has one value of 1, 2, or 3. cce-REG-MappingType: indicates whether control channel elements (CCEs) mapped to a CORESET are interleaved. If a CCE is interleaved, additional information (reg-BundleSize, interleaverSize, and shiftIndex) relating to interleaving is provided. precoderGranularity: indicates information relating to precoding of frequency resources of a CORESET. The size of a precoder may be the same as a resource element group (REG) bundle size, or the size of all frequency resources of a CORESET. tci-StatePDCCH-ToAddList, tci-StatePDCCH-ToReleaseList: indicates an activatable transmission configuration indication (TCI) state set of a CORESET. One in an activatable transmission configuration indication (TCI) state set of a CORESET may be activated through L1 signaling (e.g., DCI) or L2 signaling (e.g., MAC CE). If a CORESET is configured in an initial access process, a TCI state set may not be configured. A description of TCI states will be given later. tci-PresentInDCI: indicates whether an indicator indicating a TCI state of a PDSCH is included in DCI transmitted through a PDCCH included in a CORESET. Pdcch-DMRS-ScramblingID: a sequence scrambling index of a DMRS transmitted in a PDCCH included in a CORESET.

A terminal may perform blind decoding for receiving a PDCCH by referring to information relating to a CORESET described above.

In NR according to the disclosure, a base station may transfer, to a terminal, information relating to a quasi-co-location (QCL) relationship between antenna ports (e.g., a DMRS port of a PDSCH, a PDCCH DMRS port, or a CSI-RS port of a CSI-RS) transmitting a downlink channel, so that the terminal smoothly receives a downlink channel (e.g., a PDCCH or a PDSCH) and decodes the downlink channel. A QCL relationship between antenna ports may have one of a total of four QCL types.

“QCL-typeA”: {Doppler shift, Doppler spread, average delay, delay spread} “QCL-typeB”: {Doppler shift, Doppler spread} “QCL-typeC”: {Doppler shift, average delay} “QCL-typeD”: {Spatial RX parameter}

If two different antenna ports share a part of the QCL types described above, or one antenna port refers to a part of the QCL type of the other antenna port, a terminal may assume that the two antenna ports share a parameter supported in a QCL type, which is shared or referenced by the two antenna ports, and thus have the same values.

A base station may configure a TCI state to transfer information relating to a QCL relationship between antenna ports to a terminal. The TCI state includes information relating to one or two downlink RSs and supported QCL types. For example, the base station and the terminal may exchange signaling information as shown in [Table 2] below to transfer information relating to a TCI state.

TABLE 2

TCI-State information element

-- ASN1START

-- TAG-TCI-STATE-START

TCI-State ::=

SEQUENCE {

 tci-StateId

 TCI-StateId,

 qcl-Type1

  QCL-Info,

 qcl-Type2

 QCL-Info

OPTIONAL, -- Need R

 ...

}

QCL-Info ::=

 SEQUENCE {

 cell

ServCellIndex

OPTIONAL, -- Need R

 bwp-Id

 BWP-Id

OPTIONAL, --Cond CSI-RS-Indicated

 referenceSignal

 CHOICE {

  csi-rs

  NZP-CSI-RS-ResourceId,

  ssb

   SSB-Index

 },

 qcl-Type

  ENUMERATED {typeA, typeB, typeC, typeD},

 ...

}

-- TAG-TCI-STATE-STOP

-- ASN1STOP

“TCI-state” included in the signaling information includes information relating to each TCI state. According to the signaling information, each TCI state includes information relating to a TCI state index and one or two types of QCL-Info (qcl-Type1 and qcl-Type2). Qcl-Type1 or qcl-Type2 provides information relating to the index of a cell in which an RS is configured, an index of a BWP in which an RS is included, an RS providing information relating to a parameter supported in a QCL type according to QCL types, and one of a total of four QCL types. The qcl-Type1 may have one QCL type among “QCL-typeA”, “QCL-typeB”, or “QCL-typeC” in the total of four QCL types, and qcl-Type2 may have “QCL-typeD”. By referring to an activated TCI state of an antenna port transmitting a downlink channel, a terminal may receive and decode a downlink channel, based on an RS referenced in the activated TCI state and a QCL type supported in same.

The disclosure has a CSI framework for indicating, by a base station, measurement and reporting of channel state information (CSI) to a terminal. The CSI framework of the NR system may be configured by at least two elements including resource setting and report setting. The report setting may have an association relationship with resource setting by referring to at least one ID of the resource setting.

In the disclosure, the resource setting may include information related to a reference signal (RS) for measuring channel state information by a terminal. A base station may configure at least one resource settings for a terminal. For example, the base station and the terminal may exchange signaling information described as shown in [Table 3] below to transfer information relating to resource setting.

<table alig

CLAIMS

Claims ( 11 )

The invention claimed is:

1 . A method performed by a terminal in a communication system, the method comprising:

transmitting, to a base station, a first message including information of a best beam at an arbitrary location; receiving, from the base station, a second message including cluster information including at least one cluster identifier and beam patterns corresponding to each of the at least one cluster identifier, wherein the beam patterns are grouped into a respective cluster based on the information of the best beam in accordance with predefined criteria, wherein the beam patterns correspond to location specific beam patterns identified based on the arbitrary location and the information of the best beam, and wherein the predefined criteria is satisfied based on whether a Euclidean distance value between the beam patterns is less than or equal to a first threshold or a cosine similarity value is greater than or equal to a second threshold; identifying whether a cluster identifier corresponding to a changed location of the terminal differs from a cluster identifier corresponding to a previous location of the terminal, based on the cluster information; in case that the cluster identifier corresponding to the changed location of the terminal differs from the cluster identifier corresponding to the previous location,

transmitting, to the base station, a channel state information (CSI) report including information on a changed cluster, and

receiving, from the base station, a CSI reference signal (CSI-RS) based on the information on the changed cluster; and

in case that the cluster identifier corresponding to the changed location of the terminal does not differ from the cluster identifier corresponding to the previous location of the terminal, determining not to transmit, to the base station, the CSI report.

2 . The method of claim 1 , wherein the location of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, and

wherein the reference signal is transmitted by a new base station.

3 . The method of claim 1 ,

wherein the CSI-RS corresponds to at least one beam identified based on a changed beam pattern corresponding to the information on the changed cluster, and wherein the CSI-RS is identified based on information on a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

4 . A method performed by a base station in a communication system, the method comprising:

receiving, from a terminal, a first message including information of a best beam at an arbitrary location; identifying location specific beam patterns based on the arbitrary location and information of the best beam; grouping beam patterns, among the location specific beam patterns, into a respective cluster, based on the information of the best beam in accordance with predefined criteria, wherein the predefined criteria is satisfied based on whether a Euclidean distance value between the beam patterns is less than or equal to a first threshold or a cosine similarity value is greater than or equal to a second threshold; transmitting, to the terminal, a second message including cluster information including at least one cluster identifier and the beam patterns corresponding to each of the at least one cluster identifier, wherein the beam patterns are grouped into the respective cluster; and in case that a cluster identifier corresponding to a changed location of the terminal differs from a cluster identifier corresponding to a previous location:

receiving, from the terminal, a channel state information (CSI) report including information on a changed cluster, and

transmitting, to the terminal, a CSI reference signal (CSI-RS) based on the information on the changed cluster,

wherein in case that the cluster identifier corresponding to the changed location of the terminal does not differ from the cluster identifier corresponding to the previous location, the CSI report is not received.

5 . The method of claim 1 ,

wherein a location of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, and wherein the reference signal is transmitted by a new base station.

6 . The method of claim 4 ,

wherein the CSI-RS is identified based on information on a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

7 . A terminal of a communication system, the terminal comprising:

a transceiver; and a controller connected to the transceiver, wherein the controller is configured to:

transmit, to a base station, a first message including information of a best beam at an arbitrary location;

receive, from the base station, a second message including cluster information including at least one cluster identifier and beam patterns corresponding to each of the at least one cluster identifier, wherein the beam patterns are grouped into a respective cluster based on the information of the best beam in accordance with predefined criteria, wherein the beam patterns correspond to location specific beam patterns identified based on the arbitrary location and the information of the best beam, and wherein the predefined criteria is satisfied based on whether a Euclidean distance value between the beam patterns is less than or equal to a first threshold or a cosine similarity value is greater than or equal to a second threshold;

identify whether a cluster identifier corresponding to a changed location of the terminal differs from a cluster identifier corresponding to a previous location of the terminal, based on the cluster information;

in case that the cluster identifier corresponding to the changed location of the terminal differs from the cluster identifier corresponding to the previous location:

transmit, to the base station, a channel state information (CSI) report including information on a changed cluster, and

receive, from the base station, a CSI reference signal (CSI-RS) based on the information on the changed cluster; and

in case that the cluster identifier corresponding to the changed location of the terminal does not differ from the cluster identifier corresponding to the previous location of the terminal, determining not to transmit, to the base station, the CSI report.

8 . The terminal of claim 7 , wherein the location of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, and

wherein the reference signal is transmitted by a new base station.

9 . The terminal of claim 7 ,

wherein the CSI-RS corresponds to at least one beam identified based on a changed beam pattern corresponding to the information on the changed cluster, and wherein the CSI-RS is identified based on information on a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

10 . A base station of a communication system, the base station comprising:

a transceiver; and a controller connected to the transceiver, wherein the controller is configured to:

receive, from a terminal, a first message including information of a best beam at an arbitrary location;

identify location specific beam patterns based on the arbitrary location and information of the best beam at the arbitrary location;

group beam patterns, among the location specific beam patterns, into a respective cluster, based on the information of the best beam in accordance with predefined criteria, wherein the predefined criteria is satisfied based on whether a Euclidean distance value between the beam patterns is less than or equal to a first threshold or a cosine similarity value is greater than or equal to a second threshold;

transmit, to the terminal, a second message including cluster information including at least one cluster identifier and the beam patterns corresponding to each of the at least one cluster identifier, wherein the beam patterns are grouped into the respective cluster; and

in case that a cluster identifier corresponding to a changed location of the terminal differs from a cluster identifier corresponding to a previous location:

receive, from the terminal, a channel state information (CSI) report including information on a changed cluster, and

transmit, to the terminal, a CSI reference signal (CSI-RS) based on the information on the changed cluster,

wherein in case that the cluster identifier corresponding to the changed location of the terminal does not differ from the cluster identifier corresponding to the previous location, the CSI report is not received.

11 . The base station of claim 10 ,

wherein a location of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, wherein the reference signal is transmitted by a new base station, and wherein the CSI-RS is identified based on information on a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

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CN

CN202180083570.XA

patent/CN116601886A/en

active

Pending

2021-12-06

EP

EP21903779.3A

patent/EP4207625A4/en

active

Pending

2021-12-06

WO

PCT/KR2021/018369

patent/WO2022124733A1/en

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