Method and device for configuring antenna for communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method according to an embodiment of the present disclosure may comprise the steps of: receiving a channel state information (CSI) report-related configuration through higher layer signaling; identifying a first number of channel state information reference signal (CSI-RS) antenna port subsets on the basis of the CSI report-related configuration; identifying a second number of reception antenna port subsets; determining, on the basis of a CSI-RS antenna port subset-related priority and a reception antenna port subset-related priority, one or more CSI-RS antenna port subsets among the first number of CSI-RS antenna port subsets and determining one or more reception antenna port subsets among the second number of reception antenna port subsets; determining one or more CSI parameters on the basis of the one or more CSI-RS antenna port subsets and the one or more reception antenna port subsets; and transmitting a CSI report including the one or more CSI parameters.

Description

Method and device for setting up an antenna for a communication system

[0001] The present disclosure relates generally to a wireless communication system, and more specifically to a method and device for transmitting and receiving terminal and base station antenna activation and deactivation signals for reducing power consumption of terminals and base stations, improving energy efficiency, etc.

[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 various base station-terminal operation methods for transmitting and receiving terminal and base station antenna activation and deactivation signals in a wireless communication system.

[0009] The technical problems to be achieved in various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from various embodiments of the present disclosure described below.

[0010] A method performed by a terminal in a communication system according to one embodiment of the present disclosure includes the steps of: receiving a CSI (channel state information) reporting-related setting through higher layer signaling; identifying a first number of CSI-RS (channel state information reference signal) antenna port subsets based on the CSI reporting-related setting; identifying a second number of receive antenna port subsets; determining at least one CSI-RS antenna port subset among the first number of CSI-RS antenna port subsets and at least one receive antenna port subset among the second number of receive antenna port subsets based on a CSI-RS antenna port subset-related priority and a receive antenna port subset-related priority; determining at least one CSI parameter based on the at least one CSI-RS antenna port subset and the at least one receive antenna port subset; and transmitting a CSI report including the at least one CSI parameter.

[0011] According to one embodiment of the present disclosure, the first number of CSI-RS antenna port sub-sets correspond to different priorities.

[0012] According to one embodiment of the present disclosure, the second number of receive antenna port sub-sets correspond to different priorities.

[0013] According to one embodiment of the present disclosure, when the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets.

[0014] According to one embodiment of the present disclosure, if the priority associated with the receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets.

[0015] According to one embodiment of the present disclosure, the order of priority between the CSI-RS antenna port sub-set related priority and the receiving antenna port sub-set related priority is predefined, determined by an explicit instruction, or determined by an implicit instruction.

[0016] According to one embodiment of the present disclosure, one CSI parameter is based on one CSI-RS antenna port sub-set and one receive antenna port sub-set.

[0017] According to one embodiment of the present disclosure, if the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the number of the one or more receive antenna port sub-sets is based on the overhead of the CSI report, and reports for CSI parameters associated with the remaining receive antenna port sub-sets excluding the one or more receive antenna port sub-sets among the second number of receive antenna port sub-sets are dropped.

[0018] According to one embodiment of the present disclosure, if the priority associated with the receiving antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the number of the one or more CSI-RS antenna port sub-sets is based on the overhead of the CSI report, and reports for CSI parameters associated with the remaining CSI-RS antenna port sub-sets excluding the one or more CSI-RS antenna port sub-sets among the first number of CSI-RS antenna port sub-sets are dropped.

[0019] According to one embodiment of the present disclosure, the CSI overhead is related to the processing capability of the terminal for the CSI report.

[0020] According to one embodiment of the present disclosure, each receive antenna port sub-set includes at least one of a plurality of receive antenna ports of the terminal.

[0021] According to one embodiment of the present disclosure, the number of receive antenna ports included in each receive antenna port sub-set is greater than or equal to the maximum number of transmission layers associated with the capability of the terminal.

[0022] According to one embodiment of the present disclosure, information about the number of receive antenna ports included in each receive antenna port sub-set is included in the CSI report.

[0023] According to one embodiment of the present disclosure, the method further includes a step of receiving, through dynamic signaling, instruction information indicating activation or deactivation of one or more of the plurality of receiving antenna ports of the terminal after transmission of the CSI report.

[0024] According to one embodiment of the present disclosure, a terminal of a communication system includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive a channel state information (CSI) reporting-related configuration through higher layer signaling; identify a first number of channel state information reference signal (CSI-RS) antenna port subsets based on the CSI reporting-related configuration; identify a second number of receive antenna port subsets; determine at least one CSI-RS antenna port subset among the first number of CSI-RS antenna port subsets and at least one receive antenna port subset among the second number of receive antenna port subsets based on a CSI-RS antenna port subset-related priority and a receive antenna port subset-related priority; determine at least one CSI parameter based on the at least one CSI-RS antenna port subset and the at least one receive antenna port subset; and transmit a CSI report including the at least one CSI parameter.

[0025] According to one embodiment of the present disclosure, the first number of CSI-RS antenna port sub-sets correspond to different priorities.

[0026] According to one embodiment of the present disclosure, the second number of receive antenna port sub-sets correspond to different priorities.

[0027] According to one embodiment of the present disclosure, when the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets.

[0028] According to one embodiment of the present disclosure, if the priority associated with the receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets.

[0029] According to one embodiment of the present disclosure, the order of priority between the CSI-RS antenna port sub-set related priority and the receiving antenna port sub-set related priority is predefined, determined by an explicit instruction, or determined by an implicit instruction.

[0030] According to one embodiment of the present disclosure, one CSI parameter is based on one CSI-RS antenna port sub-set and one receive antenna port sub-set.

[0031] According to one embodiment of the present disclosure, if the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the number of the one or more receive antenna port sub-sets is based on the overhead of the CSI report, and reports for CSI parameters associated with the remaining receive antenna port sub-sets excluding the one or more receive antenna port sub-sets among the second number of receive antenna port sub-sets are dropped.

[0032] According to one embodiment of the present disclosure, if the priority associated with the receiving antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the number of the one or more CSI-RS antenna port sub-sets is based on the overhead of the CSI report, and reports for CSI parameters associated with the remaining CSI-RS antenna port sub-sets excluding the one or more CSI-RS antenna port sub-sets among the first number of CSI-RS antenna port sub-sets are dropped.

[0033] According to one embodiment of the present disclosure, the CSI overhead is related to the processing capability of the terminal for the CSI report.

[0034] According to one embodiment of the present disclosure, each receive antenna port sub-set includes at least one of a plurality of receive antenna ports of the terminal.

[0035] According to one embodiment of the present disclosure, the number of receive antenna ports included in each receive antenna port sub-set is greater than or equal to the maximum number of transmission layers associated with the capability of the terminal.

[0036] According to one embodiment of the present disclosure, information about the number of receive antenna ports included in each receive antenna port sub-set is included in the CSI report.

[0037] According to one embodiment of the present disclosure, the processor is configured to receive, through dynamic signaling, instruction information indicating activation or deactivation of one or more of the plurality of receiving antenna ports of the terminal after transmission of the CSI report.

[0038] A method performed by a base station in a communication system according to one embodiment of the present disclosure includes the steps of: identifying a first number of channel state information reference signal (CSI-RS) antenna port sub-sets; transmitting CSI (channel state information) reporting related settings related to the first number of CSI-RS antenna port sub-sets to a terminal via upper layer signaling; and receiving a CSI report including one or more CSI parameters from the terminal.

[0039] According to one embodiment of the present disclosure, the one or more CSI parameters are based on one or more CSI-RS antenna port sub-sets of the first number of CSI-RS antenna port sub-sets and one or more receive antenna port sub-sets of the second number of receive antenna port sub-sets of the terminal.

[0040] According to one embodiment of the present disclosure, the one or more CSI-RS antenna port sub-sets and the one or more receive antenna port sub-sets are based on a CSI-RS antenna port sub-set-related priority and a receive antenna port sub-set-related priority.

[0041] According to one embodiment of the present disclosure, the first number of CSI-RS antenna port sub-sets correspond to different priorities.

[0042] According to one embodiment of the present disclosure, the second number of receive antenna port sub-sets correspond to different priorities.

[0043] According to one embodiment of the present disclosure, when the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets.

[0044] According to one embodiment of the present disclosure, if the priority associated with the receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets.

[0045] According to one embodiment of the present disclosure, the method includes a step of transmitting, to the terminal through dynamic signaling, instruction information indicating activation or deactivation of one or more of the plurality of receiving antenna ports of the terminal after receiving the CSI report.

[0046] A base station 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: identify a first number of channel state information reference signal (CSI-RS) antenna port sub-sets; transmit a CSI (channel state information) reporting related configuration related to the first number of CSI-RS antenna port sub-sets to a terminal via upper layer signaling; and receive a CSI report including one or more CSI parameters from the terminal.

[0047] According to one embodiment of the present disclosure, the one or more CSI parameters are based on one or more CSI-RS antenna port sub-sets of the first number of CSI-RS antenna port sub-sets and one or more receive antenna port sub-sets of the second number of receive antenna port sub-sets of the terminal.

[0048] According to one embodiment of the present disclosure, the one or more CSI-RS antenna port sub-sets and the one or more receive antenna port sub-sets are based on a CSI-RS antenna port sub-set-related priority and a receive antenna port sub-set-related priority.

[0049] According to one embodiment of the present disclosure, the first number of CSI-RS antenna port sub-sets correspond to different priorities.

[0050] According to one embodiment of the present disclosure, the second number of receive antenna port sub-sets correspond to different priorities.

[0051] According to one embodiment of the present disclosure, when the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets.

[0052] According to one embodiment of the present disclosure, if the priority associated with the receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets.

[0053] 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.

[0054] Through the disclosure of the present disclosure, effects such as reduction in power consumption of terminals and base stations and improvement in energy efficiency in wireless communication systems can be expected.

[0055] The effects that can be obtained from various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0056] FIG. 1 illustrates the basic structure of a time-frequency resource domain according to one embodiment of the present disclosure.

[0057] FIG. 2 illustrates an expandable frame structure according to one embodiment of the present disclosure.

[0058] FIG. 3 illustrates an expandable frame structure according to one embodiment of the present disclosure.

[0059] FIG. 4 illustrates an expandable frame structure according to one embodiment of the present disclosure.

[0060] FIG. 5 illustrates a physical antenna, an antenna port, and a layer for a base station downlink according to one embodiment of the present disclosure.

[0061] FIG. 6 is a diagram illustrating a channel state information framework of a 5G NR system according to one embodiment of the present disclosure.

[0062] FIG. 7 illustrates an example of designation of CSI-RS REs by CSI-RS resource mapping according to one embodiment of the present disclosure.

[0063] FIG. 8 illustrates an example of a method for activating / deactivating some of the antenna ports of a terminal according to one embodiment of the present disclosure.

[0064] FIG. 9 illustrates an example of a method for activating / deactivating some of the antenna ports of a terminal according to one embodiment of the present disclosure.

[0065] FIG. 10 illustrates an example of a method for activating / deactivating some of the base station antenna ports according to one embodiment of the present disclosure.

[0066] FIG. 11 illustrates an example of a method for activating / deactivating some of the terminal antenna ports according to one embodiment of the present disclosure.

[0067] FIG. 12 illustrates the structure of a terminal according to one embodiment of the present disclosure.

[0068] FIG. 13 illustrates the structure of a base station according to one embodiment of the present disclosure.

[0069] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0070] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0071] 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.

[0072] 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 with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. The embodiments of the present disclosure are provided solely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the invention, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0073] 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 through 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 function 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, so that 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 be able to provide steps for performing the functions described in the flowchart block(s).

[0074] 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.

[0075] Here, the term '~ unit' used in the present embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Accordingly, according to some embodiments, the '~ unit' 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 '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within the device or secure multimedia card. Furthermore, according to some embodiments, the '~parts' may include one or more processors.

[0076] The operating principles of the present disclosure are described in detail below with reference to the attached drawings. In the following description of the present disclosure, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0077] In the following description, terms referring to broadcast information, terms referring to control information, terms related to communication coverage, terms referring to state changes (e.g., events), terms referring to network entities, terms referring to messages, terms referring to device components, etc. are examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used. Hereinafter, a base station is an entity that performs resource allocation of a 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. A 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. Of course, the present disclosure is not limited to the above examples.

[0078] The present disclosure hereinafter describes a technology for a terminal to transmit and receive information with a base station in a wireless communication system. The present disclosure relates to a communication technique and system for integrating a broadband wireless communication system for providing high-speed, high-quality data services, such as 5G and 6G communication systems, with application services such as the Internet of Things (IoT). The present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security, and safety-related services) based on 5G and 6G communication technologies and IoT-related technologies.

[0079] For convenience of explanation, some terms and names defined in the 3GPP LTE (3rd generation partnership project long-term evolution) and 5G NR (new radio) standards may be used. However, the present disclosure is not limited to these terms and names, and can be equally applied to systems conforming to other standards.

[0080] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution), E-UTRA (Evolved Universal Terrestrial Radio Access), LTE-Advanced (LTE-A), LTE-A Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0081] As a representative example of a 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 through which a terminal transmits data or control signals to a base station, and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above multiple access method distinguishes the data or control information of each user by allocating and operating the time-frequency-spatial resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0082] As post-LTE communication systems, 5G and 6G must be able to freely reflect the diverse needs of users and service providers, and therefore support services that satisfy these diverse requirements. Services being considered for 5G and 6G systems include Enhanced Mobile Broadband (eMBB), Massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0083] In some embodiments, eMBB aims to provide data rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-A Pro. For example, in 5G and 6G communication systems, eMBB should be able to provide 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. At the same time, it should provide an increased user-perceived data rate for the terminal. To meet these requirements, improvements in transmission and reception technologies, including further enhanced Multi-Input Multi-Output (MIMO) transmission technology, are required. In addition, the data rates required by 5G and 6G communication systems can be met by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz frequency bands instead of the 2 GHz band used by the current LTE.

[0084] Simultaneously, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G and 6G communication systems. To efficiently provide IoT, mMTC may require support for a large number of terminals within a cell, improved terminal coverage, improved battery life, and reduced terminal costs. The Internet of Things (IoT) requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it connects to various sensors and devices to provide communication capabilities. Furthermore, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond the reach of cells. Therefore, they may require broader coverage compared to other services provided by 5G and 6G communication systems. Terminals supporting mMTC should be inexpensive, and since frequent battery replacement is difficult, very long battery life may be required.

[0085] Finally, URLLC, a cellular-based wireless communication service used for specific mission-critical purposes such as remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts, must provide ultra-low latency and ultra-reliable communication. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds (ms) and simultaneously have a packet error rate requirement of less than 10^-5. Therefore, 5G and 6G systems for services supporting URLLC must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, design requirements require the allocation of wide resources in the frequency band. However, the above-mentioned mMTC, URLLC, and eMBB are merely examples of different service types, and the service types to which the present disclosure applies are not limited to the above-mentioned examples.

[0086] Additionally, in 5G and 6G communication systems, base stations and terminals can activate or deactivate all or part of their antennas for purposes such as improving transmission and reception performance and reducing power consumption (improving energy efficiency). Generally, increasing the number of antennas in a base station and terminal can lead to improved transmission and reception performance. Conversely, decreasing the number of antennas in a base station and terminal can lead to reduced power consumption in both the base station and terminal.

[0087] As energy efficiency improvements are considered a critical indicator in next-generation communication systems such as 5G and 6G, base stations and terminals can more dynamically activate and deactivate antennas to reduce power consumption. However, when a base station deactivates its antenna to reduce power consumption, it may face difficulties in deactivating the antenna due to the degradation of link performance. Conversely, when a terminal deactivates its antenna to reduce power consumption, it may face difficulties in deactivating the antenna due to the degradation of link performance.

[0088] Accordingly, the present disclosure proposes various base station-terminal operation methods for activating and deactivating base station and terminal antennas in a wireless communication system. The antenna configuration methods proposed in the present disclosure will likely improve the energy efficiency of the base station and terminal.

[0089] The services considered in the aforementioned 5G and 6G communication systems can be integrated and provided based on a single framework. In other words, each service can be integrated, controlled, and transmitted as a single system for efficient resource management and control.

[0090] Below, we will describe the frame structures of LTE, LTE-A, LTE-A Pro, and 5G NR systems in more detail, with reference to the drawings. Note that these frame structures can also be applied to 6G systems.

[0091] FIG. 1 illustrates the basic structure of a time-frequency resource domain according to one embodiment of the present disclosure. Specifically, FIG. 1 illustrates the basic structure of a time-frequency resource domain, which is a radio resource domain in which data or control channels of LTE, LTE-A, LTE-A Pro, and 5G NR systems based on a cyclic prefix (CP) OFDM (CP-OFDM) or SC-FDMA waveform are transmitted. In FIG. 1, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain.

[0092] The minimum transmission unit in the time domain of LTE, LTE-A, LTE-A Pro, and 5G NR systems is an OFDM symbol or an SC-FDMA symbol, and Nsymb^slot (1-05) symbols can be gathered to form one slot (1-15). In the case of LTE, LTE-A, and LTE-A Pro, two slots each consisting of Nsymb=7 symbols can be gathered to form one subframe (1-40). According to some embodiments, Nsymb^slot is determined by the length of a cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, in 5G NR, when the normal CP is applied, Nsymb = 14, and when the extended CP is applied, Nsymb = 12. The extended CP can be applied to a system with a relatively large radio transmission distance compared to the normal CP to maintain orthogonality between symbols. Additionally, according to some embodiments, 5G NR may support two types of slot structures: slots and mini-slots (mini-slots or non-slots). In LTE and LTE-A, the length of the slot is 0.5 ms and the length of the subframe is fixed at 1.0 ms, but in the case of the 5G NR system, the length of the slot or mini-slot (transmission in a time unit smaller than a slot) can be changed flexibly according to the subcarrier spacing. In LTE, LTE-A, and LTE-A Pro, the minimum transmission unit in the frequency domain is a 15 kHz subcarrier (subcarrier spacing = 15 kHz), and the bandwidth of the entire system transmission bandwidth consists of a total of NBW (1-10) subcarriers. The flexible and expandable frame structure of the 5G NR system will be described later.

[0093] The basic unit of resources in the time-frequency domain is a Resource Element (RE) (1-30), which can be represented by an OFDM symbol or SC-FDMA symbol index and subcarrier index. A Resource Block (RB) (1-20, or Physical Resource Block; PRB) can be defined as Nsymb^slot (1-05) consecutive OFDM symbols or SC-FDMA symbols in the time domain and NRB (1-25) consecutive subcarriers in the frequency domain. Therefore, one RB (1-20) consists of Nsymb x NRB REs (1-30). Data is mapped in RB units, and the base station performs scheduling for a given terminal in RB units.

[0094] According to some embodiments, subcarrier spacing, CP length, etc. are essential information for OFDM transmission and reception, and smooth transmission and reception can be achieved only when the base station and the terminal recognize them as common values.

[0095] The frame structures of LTE and LTE-A systems, as described above, are designed for conventional voice / data communications, and thus face scalability limitations when it comes to meeting diverse services and requirements, such as those of 5G NR systems. Therefore, 5G and 6G systems require flexible frame structures that take into account diverse services and requirements.

[0096] Figures 2, 3, and 4 illustrate an expandable frame structure according to one embodiment of the present disclosure.

[0097] The examples of Figures 2, 3, and 4 may include subcarrier spacing, CP length, slot length, etc. as a set of essential parameters defining an extended frame structure. In 5G and 6G systems, a slot may be the basic time unit for performing scheduling.

[0098] In the early stages of introducing new systems (e.g., 6G), coexistence or dual-mode operation with existing systems (e.g., LTE / LTE-A / LTE-A Pro, NR) is expected at least. This allows the existing systems to provide stable system operation, and the new systems to provide enhanced services. Therefore, the extended frame structure of the new system needs to include at least the frame structure or essential parameter set of the existing system. Referring to FIG. 2, the 5G NR frame structure or essential parameter set, which is the same as the frame structure of LTE / LTE-A / LTE-A Pro, is shown. Frame structure Type A illustrated in FIG. 2 indicates that the subcarrier spacing is 15 kHz, 14 symbols constitute a 1 ms slot, and a PRB (Physical Resource Block) is constituted by 12 subcarriers (= 180 kHz = 12 x 15 kHz).

[0099] Referring to FIG. 3, the frame structure type B illustrated in FIG. 3 indicates that the subcarrier spacing is 30 kHz, 14 symbols constitute a 0.5 ms slot, and 12 subcarriers (= 360 kHz = 12 x 30 kHz) constitute a PRB. In other words, compared to frame structure type A, the subcarrier spacing and PRB size are twice as large, and the slot length and symbol length are twice as small.

[0100] Referring to FIG. 4, the frame structure type C illustrated in FIG. 4 indicates that the subcarrier spacing is 60 kHz, 14 symbols constitute a 0.25 ms subframe, and 12 subcarriers (= 720 kHz = 12 x 60 kHz) constitute a PRB. In other words, compared to frame structure type A, the subcarrier spacing and PRB size are four times larger, and the slot length and symbol length are four times smaller.

[0101] That is, by generalizing the above frame structure types, high scalability can be provided by making the essential parameter sets, such as subcarrier spacing, CP length, and slot length, have an integer multiple relationship with each frame structure type. In addition, a subframe with a fixed length of 1 ms can be defined to represent a reference time unit that is independent of the frame structure type. Accordingly, frame structure type A has one subframe composed of one slot, frame structure type B has one subframe composed of two slots, and frame structure type C has one subframe composed of four slots. Of course, the scalable frame structure is not limited to the frame structure types A, B, or C described above, and can be applied to other subcarrier spacings such as 120 kHz and 240 kHz and can obviously have different structures.

[0102] According to some embodiments, the frame structure types described above can be applied to various scenarios. From a cell size perspective, a longer CP length can support a larger cell, so frame structure type A can support relatively larger cells than frame structure types B and C. From an operating frequency band perspective, a larger subcarrier spacing is advantageous for phase noise recovery in a high-frequency band, so frame structure type C can support relatively higher operating frequencies than frame structure types A and B. From a service perspective, a shorter subframe length is advantageous for supporting ultra-low latency services such as URLLC, so frame structure type C is relatively suitable for URLLC services than frame structure types A and B. In addition, multiple frame structure types can be multiplexed and integrated into a single system for integrated operation.

[0103] Next, we specifically describe the antenna configuration and transmission / reception methods of base stations / terminals in a 5G NR system. Note that these methods and structures can also be applied to 6G systems.

[0104] FIG. 5 illustrates a physical antenna, an antenna port, and a layer for a base station downlink according to one embodiment of the present disclosure.

[0105] Each base station antenna port (5-15) in FIG. 5 represents one or more physical antennas (5-5) virtualized (5-10). In LTE / LTE-A / LTE-A Pro / NR systems, transmit antenna ports are allocated for data, control signals, and reference signals (RS). Note that a similar approach can be applied to 6G systems.

[0106] For example, ports 1000, 1001, … can be allocated for transmitting downlink data (or physical downlink data channel (PDSCH)), ports 3000, 3001, … can be allocated for transmitting CSI-RS (Channel State Information Reference Signal), and ports 2000, 2001, … can be allocated for transmitting downlink control signals (or physical downlink control channel (PDCCH)).

[0107] The base station can transmit at least one layer (5-25) containing independent data through the PDSCH port after precoding (5-20). Whether the receiver can decode data transmitted to multiple layers without errors depends on the number of transmit antenna ports, the number of receive antenna ports, and the channel condition. Therefore, the base station can consider the number of receive antenna ports, the number of transmit antenna ports, channel state information (CSI), and the size of the transmitted data to determine the number of layers. The downlink antenna / port configuration and transmission / reception method described above can be similarly used in the uplink.

[0108] The base station can use downlink channel state information to determine the number of layers and precoding matrix for PDSCH transmission. In some embodiments, the downlink channel state information is obtained by the terminal measuring the CSI-RS transmitted from the base station, and the terminal reports the measured channel state information to the base station.

[0109] Next, we specifically describe the process of measuring and reporting channel status information between base stations and terminals in a 5G NR system. Note that the method and structure can also be applied to 6G systems.

[0110] FIG. 6 is a diagram illustrating a channel state information framework of a 5G NR system according to one embodiment of the present disclosure. The NR CSI framework of FIG. 6 consists of two elements: a resource setting and a report setting. The report setting can reference the ID of the resource setting to establish at least one link between the two.

[0111] In some embodiments, a resource setting is an element including reference signal-related information, and a base station may set at least one resource setting (6-00, 6-05, 6-15) to a terminal. Each resource setting may include at least one resource set (6-20, 6-25).

[0112] Each resource set can include at least one resource (6-30, 6-35). Each resource (6-30, 6-35) can include detailed information about the RS, such as the RE location information where the RS is transmitted, the RS transmission period and offset in the time axis, the number of ports of the RS, etc.

[0113] According to some embodiments, a report setting is an element including information related to a CSI reporting method, and a base station can set at least one report setting (6-40, 6-45, 6-50) to a terminal. At this time, each report setting can include report transmission characteristic information such as aperiodic, semi-permanent, periodic, etc., a channel through which the report is transmitted (whether it is a PUSCH (Physical Uplink Shared Channel) or a PUCCH (Physical Uplink Control Channel), etc.), and channel information to be reported - number of ranks, precoding matrix index, channel quality information (Channel Quality Indicator: CQI), etc. At this time, the report setting has at least one ID for referencing a channel referenced by the terminal in the corresponding CSI report or reference signal (or RE location) information for interference measurement, and this is diagrammed as a link (6-60, 6-65, 6-70, 6-75).

[0114] In some embodiments, if a link (6-60) connects one reporting setting (6-40) and one resource setting (6-00), the resource setting (6-00) can be used for channel measurement. If a link (6-65, 6-70) connects one reporting setting (6-45) and two resource settings (6-00, 6-05), one of the two resource settings can be used for channel measurement, and the other resource setting can be used for interference measurement.

[0115] In some embodiments, each resource setting includes resource transmission characteristic information such as aperiodic, semi-persistent, periodic, etc.

[0116] In some embodiments, each resource set within a resource setting may set information including the values ​​listed below through a higher layer, but is not limited to the examples below.

[0117] - repetition: spatial domain transfer filter for resources in the resource set

[0118] (spatial domain transmission filter) related information

[0119] - trs-Info: Tracking RS for time / frequency tracking of resources within the resource set

[0120] Information on whether it is used as (TRS)

[0121] If repetition is 'ON', the terminal can know that the same spatial domain transmission filter is applied to all resources belonging to the resource set (i.e., the terminal can assume that the base station used the same transmission beam), and that each resource has the same number of ports and periodicity. If repetition is 'OFF', the terminal cannot assume that the same spatial domain transmission filter is applied to all NZP CSI-RS resources belonging to the resource set (i.e., the terminal cannot assume that the base station used the same transmission beam), and that each resource has the same number of ports and periodicity.

[0122] NZP CSI-RS may be the most representative reference signal configured in a resource set, and information including the values ​​listed below can be configured for each CSI-RS through a higher layer. However, this is not limited to the examples below.

[0123] - periodicityAndOffset: Transmission period and slot offset of the corresponding CSI-RS resource

[0124] - CSI-RS-resourceMapping: OFDM symbol location within the slot of the corresponding CSI-RS resource and subcarrier location within the PRB

[0125] - nrofPorts: The number of CSI-RS ports included in the corresponding CSI-RS resource.

[0126] - density: Frequency density of the corresponding CSI-RS.

[0127] - cdm-Type: CDM length and CDM RE pattern of the corresponding CSI-RS.

[0128] - powerControlOffset: Ratio between PDSCH EPRE (Energy Per RE) and NZP CSI-RS EPRE

[0129] - powerControlOffsetSS: Ratio between SS / PBCH block EPRE and NZP CSI-RS EPRE

[0130] According to some embodiments, in 5G NR, the number of CSI-RS ports can be set to one of {1, 2, 4, 8, 12, 16, 24, 32} for one CSI-RS resource, and different degrees of configuration freedom are supported depending on the number of CSI-RS ports set for the CSI-RS resource. Table 1 shows the CSI-RS density, CDM length and type, frequency axis and time axis start position of the CSI-RS component RE pattern that can be configured depending on the number of NR CSI-RS ports (X). , represents the number of frequency axis REs (k') and the number of time axis REs (l') of the CSI-RS component RE pattern.

[0131] FIG. 7 illustrates an example of designating CSI-RS REs through CSI-RS resource mapping according to one embodiment of the present disclosure. Note that the method and structure can also be applied to 6G systems.

[0132] According to some embodiments, a CSI-RS component RE pattern is a basic unit that constitutes a CSI-RS resource and is adjacent in the frequency axis. The REs of the dog and the adjacent ones on the time axis It can be composed of YZ REs in total. Referring to Table 1, NR supports different degrees of freedom in frequency axis configuration depending on the number of CSI-RS ports configured in the CSI-RS resource. In the case of 1 port, it can be configured without subcarrier restrictions within the PRB, and the CSI-RS RE position can be specified by a 12-bit bitmap (7-00). In the case of {2, 4, 8, 12, 16, 24, 32} ports and Y=2, it can be configured for every two subcarriers within the PRB, and the CSI-RS RE position can be specified by a 6-bit bitmap (7-05). In the case of 4 ports and Y=4, it can be configured for every four subcarriers within the PRB, and the CSI-RS RE position can be specified by a 3-bit bitmap (7-10). Similarly, the time axis RE position can be specified by a total of 14-bit bitmap. At this time, it is possible for the length of the bitmap to change as in the frequency position designation according to the Z value of Table 1, but the principle is similar to the above explanation, so a detailed explanation is omitted.

[0133] For example, if X is set to 2 ports and Y=2, Z=1, the base station designates the frequency axis RE position by (7-05), and if the frequency axis subcarrier position is designated by 2 of (7-05) and the time axis OFDM symbol position is designated by 9 of (7-15), then based on this, the terminal can know that the CSI-RS is transmitted at the RE position of (7-25) within the corresponding PRB (7-20).

[0134] [Table 1] CSI-RS locations within a slot

[0135]

[0136] In some embodiments, a base station may schedule a PDSCH for a terminal by considering channel status information and the size of data to be transmitted to the terminal, and then notify the terminal of the scheduling information via downlink control information (DCI). The DCI notified may include the number of layers of the scheduled downlink data and its location on the frequency-time axis. Next, the DCI notified by the base station to the terminal when scheduling downlink data in a 5G NR system is described in detail. Note that the method and structure can also be applied to a 6G system.

[0137] In the NR system, scheduling information for PDSCH is transmitted from the base station to the terminal via DCI. The terminal can monitor DCI formats for fallback and non-fallback for PUSCH or PDSCH. The fallback DCI format can consist of fixed fields pre-defined between the base station and the terminal, while the non-fallback DCI format can include configurable fields.

[0138] The above DCI can be transmitted via PDCCH after going through channel coding and modulation process. A CRC (Cyclic Redundancy Check) is attached to the DCI message payload, and the CRC is scrambled with an RNTI (Radio Network Temporary Identifier) ​​corresponding to the identity of the terminal. Different RNTIs are used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process and transmitted. When the terminal receives the DCI message transmitted on the PDCCH, the terminal verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the terminal can know that the message was transmitted to the terminal.

[0139] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0140] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the following information.

[0141] [Table 2]

[0142]

[0143] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the following information.

[0144] [Table 3]

[0145]

[0146]

[0147] Through the antenna ports entry in Table 3 above, the base station can notify the terminal of the DMRS (DeModulation Reference Signal) port for scheduled data decoding. For example, if the DMRS type is set to type 1 and the number of DMRS symbols is set to 1 through upper layer signaling, such as RRC signaling, the DMRS port corresponding to each codepoint in the antenna ports entry in the DCI is as shown in Table 4.

[0148] [Table 4]

[0149]

[0150] In some embodiments, the terminal expects that there will be as many PDSCH layers as there are DMRS ports corresponding to the codepoints of the antenna ports items in the DCI, and decodes data of each layer based on the DMRS.

[0151] In order for a terminal to successfully receive a multi-layer PDSCH, it must have a number of receive antenna ports equal to or greater than the number of layers. If the base station knows the maximum number of layers that the terminal can receive or the number of receive antennas of the terminal, it can set the maximum number of PDSCH transmission layers accordingly. In some embodiments, the terminal may report the maximum number of layers that it can receive through a UE capability report before completing RRC connection establishment. Report to the base station.

[0152] As explained above, the number of layers of PDSCH to be received by the terminal is notified by DCI, and this can be dynamically changed. Therefore, in order for the terminal to successfully receive the PDSCH, it must report to the base station when reporting the terminal capability. The number of receiving antenna ports corresponding to the number of layers must always be activated.

[0153] As previously explained, increasing the number of antennas at a base station and terminal generally leads to improved transmission and reception performance. Conversely, decreasing the number of antennas at a base station and terminal leads to reduced power consumption at both the base station and terminal. In this disclosure, the number of antennas may refer to the number of physical antennas or the number of antenna ports. For convenience of explanation, the following examples generally refer to the number of antenna ports, but note that other terms with similar meanings may be substituted.

[0154] As energy efficiency improvements are considered a critical indicator in next-generation communication systems, base stations and terminals need to more dynamically activate and deactivate antennas to reduce power consumption. For example, operating with a large number of transmit and receive antenna ports, even if transmit and receive performance is guaranteed, can result in unnecessary power consumption. Specifically, 6G systems may support more ports than the current maximum number of CSI-RS ports (32 ports) in 5G NR systems. Furthermore, the number of ports required for terminal antenna ports may exceed the current 5G NR system requirement of 4 ports.

[0155] If a terminal or base station wishes to activate / deactivate some of its antenna ports for reasons such as power consumption reduction, notification and instructions regarding this may be required between the base station and the terminal. Various embodiments of the present disclosure, including specific operational methods at the upper and physical layers to support this, are described below. The antenna configuration method proposed in this disclosure can guarantee transmission and reception performance between the base station and the terminal, while simultaneously improving energy efficiency at both the base station and the terminal.

[0156] It is noted that one or more of the embodiments below may be used in combination with each other in the present disclosure.

[0157] Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, 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.

[0158] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0159] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0160] - MIB (Master Information Block)

[0161] - SIB (System Information Block) or SIB

[0162] - RRC (Radio Resource Control)

[0163] - MAC (Medium Access Control) CE (Control Element)

[0164] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the physical layer channel or signaling below.

[0165] - PDCCH (Physical Downlink Control Channel)

[0166] - DCI (Downlink Control Information)

[0167] - UE-specific DCI

[0168] - Group common DCI

[0169] - Common DCI

[0170] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0171] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0172] - PUCCH (Physical Uplink Control Channel)

[0173] - UCI (Uplink Control Information)

[0174] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority. In the present disclosure, dropping may be replaced with other terms with similar meanings. For example, it may be replaced with cancel, omit, etc.

[0175] Unless specifically stated otherwise, channel state and channel state information may be used interchangeably in the description of this disclosure.

[0176] In the description of the present disclosure, a / b means at least one of a or b.

[0177] <Example 1>

[0178] The first embodiment considers an environment where multiple antennas are installed at both the base station and the terminal. Furthermore, the first embodiment considers a method for activating / deactivating some antenna ports, simultaneously considering transmission / reception performance between the base station and the terminal and reduced power consumption (improved energy efficiency). Furthermore, the first embodiment proposes a comprehensive procedure, including notification and instruction of related information between the base station and the terminal, to support this operation.

[0179] In the present disclosure, the following factors may be considered when determining whether to activate the base station and terminal antennas. However, it should be noted that the factors determining whether to activate the base station and terminal antennas in the present disclosure are not limited to the following. All or at least some of the following factors may be considered.

[0180] * Base station antenna operation information

[0181] * Terminal antenna operation information

[0182] * Channel state information (CSI) between base station and terminal

[0183] * Terminal power

[0184] * Power of base station

[0185] The terminal may report one or more of the above-listed elements to the base station, and the base station may provide one or more of the above-listed elements to the terminal. The base station may determine whether to activate the terminal and base station antennas by synthesizing the information reported by the terminal and already known information, such as base station configuration parameters. The base station may explicitly transmit the terminal and base station antenna activation signal to the terminal via a downlink control channel. And / or the base station may implicitly notify the terminal antenna activation information to the terminal through methods such as component carrier, frequency, and time resource allocation. Note that the number of receive antennas of the terminal must be equal to or greater than the maximum number of layers transmitted by the base station.

[0186] In the present disclosure, when a base station provides information related to antenna activation / deactivation to a terminal, the notification and instruction of the related information may be in the form of RRC (Radio Resource Control), MAC-CE (MAC Control Element), and DCI (Downlink Control Information). In addition, when a terminal provides information related to antenna activation / deactivation to a base station, the notification and instruction of the related information may be in the form of RRC (Radio Resource Control), MAC-CE (MAC Control Element), and UCI (Uplink Control Information). When a base station transmits information related to antenna activation / deactivation to a terminal, at least some or a combination of at least some of RRC, MAC-CE, and DCI may be used. When a terminal transmits information related to antenna activation / deactivation to a base station, at least some or a combination of at least some of RRC, MAC-CE, and UCI may be used.

[0187] Specifically, the base station can instruct the terminal on the antenna operation information of the base station among the above elements.

[0188] Here, the base station antenna operation information may be information regarding the maximum number of layers transmitted by the base station. The base station can determine and configure information regarding the maximum number of layers and provide this information to the terminal to help determine whether to activate the terminal's receive antennas. As described above, the number of receive antennas for the terminal must be equal to or greater than the maximum number of layers transmitted by the base station. Therefore, if information regarding the maximum number of layers is provided to the terminal, the terminal will be able to determine the maximum number of receive antennas to activate.

[0189] Alternatively, base station antenna operation information may be information about the number of antennas that the base station can control and configure. The base station can determine base station antenna information and provide it to the terminal, which can then use the base station antenna information to report channel conditions between the base station and the terminal. For further details, please refer to the embodiments below.

[0190] In contrast, base station antenna operation information can be information about the number of antenna layers currently being transmitted by the base station. By understanding the channel conditions between the base station and the terminal, the number of antenna layers can be determined within the maximum number of layers provided by the base station to the terminal.

[0191] Specifically, the terminal can report antenna operation information of the terminal among the above elements to the base station.

[0192] Here, the antenna operation information of the terminal may be information on the terminal's capability for antenna operation. The antenna operation information of the terminal may be information on the maximum number of layers that the terminal can receive. If the terminal provides information on the maximum number of layers that the terminal can receive to the base station, the base station can refer to this information and indicate to the terminal information on the maximum number of layers that the base station transmits. If the terminal wishes to reduce power consumption by deactivating the receiving antenna, the terminal can request the base station to adjust the maximum number of layers that the base station transmits. This can be achieved by receiving information on the maximum number of layers that the base station transmits and notifying the terminal that it cannot support the corresponding operation.

[0193] Alternatively, the terminal's antenna operation information may be information regarding the terminal's maximum number of receiving antennas (ports). For further details, please refer to the embodiments below.

[0194] The terminal's antenna operation information may allow the base station to dynamically change the terminal's receiving antenna operation. In this case, the base station can determine and set whether to activate / deactivate the corresponding operation and instruct and notify the terminal. For details, please refer to the examples below.

[0195] Specifically, the terminal may report its power consumption information to the base station among the above elements. The power consumption information may include various information related to the terminal's power. For example, it may be information related to the terminal's remaining power (e.g., battery capacity). Another example may be information related to the PA (Power Amplifier). Specifically, it may include information regarding the number of PAs present in the terminal and / or information regarding the number of currently activated PAs.

[0196] Specifically, the base station can provide the terminal with information about the base station's power consumption among the above elements. This power consumption information may include various information related to the base station's power consumption. For example, the base station power consumption information may include information regarding whether the base station is operating to reduce power consumption.

[0197] <Example 2>

[0198] In the second embodiment, an environment in which multiple antennas are installed at the base station and terminal is considered. Furthermore, in the second embodiment, one or more antenna sets are defined for the base station and terminal antennas to enable / disable some of the antenna ports.

[0199] First, antenna sets for base station and terminal antennas may be defined. That is, one or more antenna sets may be defined for base station and terminal antennas. Furthermore, each antenna set may be configured with a different number of antenna ports. This is merely for convenience of explanation, and the present disclosure is not limited to the specific terminology described above. In other words, it should be noted that the term "antenna set" may be replaced with other terms with similar meanings. For example, the term "antenna subset" may be used. When the term "antenna subset" is used, a case configured with a smaller number of antenna ports than the number of currently activated antenna ports may be named an antenna subset. The term "antenna set" is used in the description of the present embodiment.

[0200] The number of antenna sets of the base station and terminal is defined as follows.

[0201] * X: Number of base station antenna sets

[0202] ** X ≥ 1 may be possible, and when multiple antenna sets are defined, each antenna set may be configured with different antenna ports and port numbers, and each antenna set may have different priority values. Here, the antenna port may represent a CSI-RS antenna port. The terminal may report information related to X to the base station as capability information of the terminal. The information related to X may be information about CSI reports that the terminal can process.

[0203] * Y: Number of terminal antenna sets

[0204] ** Y ≥ 1, and when multiple antenna sets are defined, each antenna set can be configured with different antenna ports and port numbers, and each antenna set can have different priority values. Here, the antenna port can represent a receiving antenna port of the terminal. The number of antenna ports defined for each antenna set must be equal to or greater than the maximum number of layers transmitted by the base station. The terminal can report information related to Y to the base station as capability information of the terminal. Information related to Y can be information about CSI reports that the terminal can process.

[0205] <Example 3>

[0206] The third embodiment considers an environment where multiple antennas are installed at both the base station and the terminal. Furthermore, the third embodiment proposes a method for the terminal to report channel state information (CSI) between the base station and the terminal regarding base station antenna information, enabling / disabling some of the antenna ports.

[0207] First, reference is made to the definition of the antenna set for the base station and terminal antennas in the second embodiment. The definition of the antenna set for the base station and terminal antennas in the second embodiment can also be applied to the third embodiment.

[0208] The terminal can report CSI for X(≥1) and Y(≥1) to the base station.

[0209] In this embodiment, Y (≥ 1) can be determined by the terminal. In addition, the number of terminal antenna ports set in Y sets can be reported to the base station as CSI.

[0210] At this time, if Y=1, the number of terminal antenna ports may not be reported to the base station. If Y>1, the base station can determine the number of terminal antenna ports using antenna activation / deactivation information and indicate it to the terminal. At this time, the indication method can be supported in various ways, such as RRC, MAC-CE, DCI, or combinations thereof. Meanwhile, for the purpose of reducing power consumption (improving energy efficiency), a dynamic indication method through MAC-CE or DCI may be more advantageous.

[0211] In contrast, when Y=1, the base station may not need to determine and indicate the number of antenna ports of the terminal. Therefore, in this case, as described in the first embodiment, the base station can only indicate to the terminal information about the maximum number of layers that the base station transmits.

[0212] FIG. 8 illustrates an example of a method for activating / deactivating some of the antenna ports of a terminal according to one embodiment of the present disclosure.

[0213] Referring to FIG. 8, a terminal (810) can report CSI, and a base station (800) can receive it (801). The base station (800) can transmit an activation / deactivation instruction for a receiving antenna port of the terminal (810), and the terminal (810) can receive it. The base station (800) can determine the channel status between the base station and the terminal and configure and instruct the terminal (802) to activate / deactivate some of the receiving antenna ports of the terminal (810). For example, the channel status between the base station and the terminal can be determined from the CSI feedback (801) reported by the terminal.

[0214] Note that when a terminal reports CSI for X(≥1) and Y(≥1) compared to a case where the terminal feeds back CSI to the base station assuming one set of antennas for the base station and the terminal, the amount of feedback reported by the terminal to the base station may significantly increase. Specifically, when X(>1) and Y(>1), the CSI overhead may increase by X*Y compared to a single antenna set. Therefore, the present disclosure proposes a CSI dropping method according to the CSI overhead. Specifically, the methods below are as follows, and the methods below may be performed independently or at least partially combined.

[0215] * Method 1: X always has higher priority than Y.

[0216] ** Method 1 is a method in which the CSI for the base station antenna set always has priority over the CSI for the terminal antenna set. In other words, the CSI for the base station antenna set is fed back with priority based on the currently applied terminal antenna set, and then the CSI for other terminal antenna sets that are not currently applied can be fed back. First, when the CSI for X(>1) is reported, the terminal gives priority to feeding back the CSI for the antenna set with a higher priority (higher importance) in each antenna set. Next, when the CSI for Y(>1) is reported, the terminal also gives priority to feeding back the CSI for the antenna set with a higher priority (higher importance) in each antenna set. If the CSI overhead increases and not all CSI can be fed back to the base station, the CSI for the antenna set with a lower priority (lower importance) may be dropped first.

[0217] * Method 2: Y always has higher priority than X.

[0218] ** Method 2 is a method in which the CSI for the terminal antenna set always has priority over the CSI for the base station antenna set. In other words, the CSI for the terminal antenna set is fed back with priority based on the currently applied base station antenna set, and then the CSI for other base station antenna sets that are not currently applied can be fed back. First, when the CSI for Y(>1) is reported, the terminal gives priority to feeding back the CSI for the antenna set with a higher priority (higher importance) in each antenna set. Next, when the CSI for X(>1) is reported, the terminal also gives priority to feeding back the CSI for the antenna set with a higher priority (higher importance) in each antenna set. If the CSI overhead increases and not all CSI can be fed back to the base station, the CSI for the antenna set with a lower priority (lower importance) may be dropped first.

[0219] * Method 3: The priorities of X and Y are determined by their settings and / or status.

[0220] ** In method 3, the priorities of X and Y can be determined according to the base station's decision and configuration. Specifically, the configuration can be configured as a higher layer configuration such as RRC. Alternatively, a configuration method such as MAC-CE or DCI can be considered. Alternatively, it can be determined implicitly according to a specific state. For example, it can be determined depending on whether the base station and the terminal are in a power consumption reduction operation mode. If the base station is in a power consumption reduction operation mode, the above method 1 can be applied. Alternatively, if the terminal is in a power consumption reduction operation mode, the above method 2 can be applied. This is for convenience of explanation only, and the present disclosure is not limited to the above specific mode names.

[0221] A terminal can report information related to X*Y to a base station using the terminal's capability information. The information related to X*Y may be information about CSI reports that the terminal can process.

[0222] <Example 4>

[0223] The fourth embodiment considers an environment where multiple antennas are installed at both the base station and the terminal. Furthermore, another method is proposed whereby the terminal reports channel state information (CSI) between the base station and the terminal regarding base station antenna information to enable / disable some of the antenna ports.

[0224] First, reference is made to the definition of the antenna set for the base station and terminal antennas in the second embodiment. The definition of the antenna set for the base station and terminal antennas in the second embodiment can also be applied to the fourth embodiment.

[0225] The terminal can report CSI for X (≥1) and Y (=1) to the base station.

[0226] Unlike the third embodiment, the fourth embodiment considers the case where Y(=1) is fixed or the case where Y(=1) is present. In addition, unlike the method in the third embodiment where the base station determines the number of antenna ports of the terminal using antenna activation / deactivation information and instructs the terminal, the method in the fourth embodiment is a method where the terminal directly determines the number of antenna ports of the terminal and reports it to the base station. The number of reception antenna ports of the terminal determined by the terminal can be reported to the base station as CSI.

[0227] The method presented in the fourth embodiment grants the terminal the autonomy / freedom to determine the number of receiving antenna ports, and a method in which the base station determines whether to allow this operation may be considered. In this case, the base station can determine and set whether to activate / deactivate the operation and instruct and notify the terminal. Therefore, only when the base station activates the operation, the terminal can dynamically change its receiving antenna operation and report the corresponding information to the base station.

[0228] In this embodiment, the reason why the terminal dynamically reports the changed terminal reception antenna information to the base station is because the base station needs to compensate for the CSI using this information. For example, if the base station receives two CSI feedbacks from the terminal, and the first and second CSIs are reported assuming different terminal reception antennas, and the base station uses both CSIs, the base station will need to compensate for the impact of the different assumptions on the two CSIs.

[0229] FIG. 9 illustrates an example of a method for activating / deactivating some of the antenna ports of a terminal according to one embodiment of the present disclosure.

[0230] Referring to FIG. 9, a terminal (900) can transmit an activation / deactivation instruction for a receiving antenna port of the terminal, and a base station (910) can receive it. The terminal (900) can report CSI, and the base station (910) can receive it. The terminal (900) can directly activate / deactivate some of the receiving antenna ports of the terminal and report (901) information thereon to the base station (910). When the base station receives CSI feedback from the terminal (902), the base station can compensate for the CSI by considering the number of activated / deactivated receiving antennas of the terminal. Various methods can be used for the base station to compensate for the CSI based on the information received from the terminal, and the present disclosure is not limited to a specific method.

[0231] Note that when reporting CSI for X(≥1) and Y(=1) compared to the case where the terminal feeds back CSI to the base station assuming one set for the number of antennas of the base station and the terminal, the amount of feedback reported by the terminal to the base station may increase. Note that, compared to the case of the third embodiment, only the CSI overhead for X(>1) may increase here. The terminal may determine the CSI dropping method according to different priority values ​​for the X(>1) sets. Specifically, when the terminal reports CSI for X(>1), the terminal feeds back CSI for an antenna set with a higher priority (higher importance) among each antenna set as a priority. If the CSI overhead increases and not all CSI can be fed back to the base station, the CSI for an antenna set with a lower priority (lower importance) may be dropped as a priority.

[0232] <Example 5>

[0233] The fifth embodiment considers an environment in which multiple antennas are installed at both the base station and the terminal. Furthermore, the fifth embodiment considers a method for activating / deactivating some antenna ports, while simultaneously considering transmission / reception performance between the base station and the terminal and reduced power consumption (improved energy efficiency). The related operations are described in more detail with reference to the drawings.

[0234] FIG. 10 illustrates an example of a method for activating / deactivating some of the base station antenna ports according to one embodiment of the present disclosure. As illustrated in FIG. 10 , the base station can perform operations to reduce power consumption (enhance energy efficiency) in the power, frequency, and spatial domains. It should be noted that the operation of activating / deactivating some of the base station antenna ports is an operation in the spatial domain.

[0235] Specifically, referring to FIG. 10, instead of activating all antenna ports in the spatial domain as in FIG. 10(a), base station power consumption can be reduced by activating only some antenna ports as in FIG. 10(b). For example, if 64 CSI-RS ports are activated, only fewer than 64 CSI-RS ports can be activated to reduce power consumption.

[0236] FIG. 11 illustrates an example of a method for activating / deactivating some of the terminal antenna ports according to one embodiment of the present disclosure. Referring to FIG. 11, a case in which eight receiving antennas are mounted on the terminal is illustrated.

[0237] Specifically, instead of activating all 8 terminal receiving antenna ports (8 Rx mode) as shown in Fig. 11(a), the terminal power consumption can be reduced by activating only some of the antenna ports. For example, if the terminal has 8 receiving antenna ports, the terminal can use the 6Rx mode (Fig. 11(b)) in which only 6 ports are activated, the 4Rx mode (Fig. 11(c)) in which 4 ports are activated, the 2Rx mode (Fig. 11(d)) in which 2 ports are activated, and the 1Rx mode (Fig. 11(e)) in which 1 port is activated. In addition, the terminal can report to the base station whether it supports switching between each Rx mode. Depending on the capability of the terminal, switching between the Rx modes of the terminal may be possible only in certain cases. The terminal can independently receive the receiving antenna port disable / enable setting for each bandwidth (e.g., component carrier (CC), bandwidth part (BWP), etc.).

[0238] FIG. 12 illustrates the structure of a terminal according to one embodiment of the present disclosure.

[0239] The structure of a terminal for performing the above embodiments of the present disclosure is illustrated in FIG. 12. According to FIG. 19, the terminal may be configured with a transceiver unit (12-00, 12-10), a memory, and a processing unit (12-05) including a processor. Depending on the communication method of the terminal described above, the transceiver unit (12-00, 12-10) and the processing unit (12-05) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the transceiver unit (12-00, 12-10) and the processing unit (12-05) may be implemented in the form of a single chip.

[0240] The transceiver (12-00, 12-10) can transmit and receive signals with a base station. Here, the signals can include control information and data. To this end, the transceiver (12-00, 12-10) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transceiver (12-00, 12-10), and the components of the transceiver (12-00, 12-10) are not limited to the RF transmitter and RF receiver.

[0241] In addition, the transmitter / receiver unit (12-00, 12-10) can receive a signal through a wireless channel and output it to the processing unit (12-05), and transmit the signal output from the processing unit (12-05) through the wireless channel.

[0242] The processing unit (12-05) can store programs and data necessary for the operation of the terminal. In addition, the processing unit (12-05) can store control information or data included in signals acquired from the terminal. The processing unit (12-05) can include a memory configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD.

[0243] FIG. 13 illustrates the structure of a base station according to one embodiment of the present disclosure.

[0244] The structure of a base station for performing the above embodiments of the present disclosure is illustrated in FIG. 20. According to FIG. 20, the base station may be configured with a transceiver unit (13-00, 13-10) and a processing unit (13-05) including a memory and a processor. Depending on the communication method of the base station described above, the transceiver unit (13-00, 13-10) and the processing unit (13-05) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. In addition, the transceiver unit (13-00, 13-10) and the processing unit (13-05) may be implemented in the form of a single chip.

[0245] The transceiver (13-00, 13-10) can transmit and receive signals with the terminal. Here, the signals can include control information and data. To this end, the transceiver (13-00, 13-10) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transceiver (13-00, 13-10), and the components of the transceiver (13-00, 13-10) are not limited to the RF transmitter and RF receiver.

[0246] In addition, the transmitter / receiver unit (13-00, 13-10) can receive a signal through a wireless channel and output it to the processing unit (13-05), and transmit the signal output from the processing unit (13-05) through the wireless channel.

[0247] The processing unit (13-05) can store programs and data required for the operation of the base station. In addition, the processing unit (13-05) can store control information or data included in signals acquired from the base station. The processing unit (13-05) can include a memory configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD.

[0248] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples presented to easily explain the technical content of the present disclosure and aid in understanding of 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 modifications based on the technical concepts of the present disclosure are possible.

Claims

1. In a method performed by a terminal in a communication system, A step of receiving settings related to CSI (channel state information) reporting through upper layer signaling; A step of identifying a first number of CSI-RS (channel state information reference signal) antenna port sub-sets based on the above CSI reporting related settings; A step of identifying a second sub-set of receive antenna ports; A step of determining one or more CSI-RS antenna port sub-sets among the first number of CSI-RS antenna port sub-sets and determining one or more receive antenna port sub-sets among the second number of receive antenna port sub-sets based on the priorities associated with the CSI-RS antenna port sub-sets and the priorities associated with the receive antenna port sub-sets; determining one or more CSI parameters based on the one or more CSI-RS antenna port sub-sets and the one or more receive antenna port sub-sets; and A method comprising the step of transmitting a CSI report including one or more of the CSI parameters.

2. In paragraph 1, The above first number of CSI-RS antenna port sub-sets correspond to different priorities, The second number of receiving antenna port sub-sets correspond to different priorities, If the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, If the priority associated with the above receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, A method wherein the order relationship between the priorities associated with the CSI-RS antenna port sub-sets and the priorities associated with the receiving antenna port sub-sets is predefined, determined by an explicit instruction, or determined by an implicit instruction.

3. In paragraph 2, One CSI parameter is based on one CSI-RS antenna port sub-set and one receive antenna port sub-set, If the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the number of the one or more receive antenna port sub-sets is based on the overhead of the CSI report, and reports for CSI parameters associated with the remaining receive antenna port sub-sets excluding the one or more receive antenna port sub-sets among the second number of receive antenna port sub-sets are dropped. If the priority associated with the receiving antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the number of the one or more CSI-RS antenna port sub-sets is based on the overhead of the CSI report, and reports on CSI parameters associated with the remaining CSI-RS antenna port sub-sets excluding the one or more CSI-RS antenna port sub-sets among the first number of CSI-RS antenna port sub-sets are dropped, The above CSI overhead is related to the processing capability of the terminal for the CSI report.

4. In paragraph 1, Each receive antenna port sub-set includes at least one of the plurality of receive antenna ports of the terminal, The number of receiving antenna ports included in each receiving antenna port sub-set is greater than or equal to the maximum number of transmission layers associated with the capability of the terminal, A method wherein information about the number of receive antenna ports included in each receive antenna port sub-set is included in the CSI report.

5. In paragraph 1, A method further comprising the step of receiving, through dynamic signaling, instruction information indicating activation or deactivation of one or more of the plurality of receiving antenna ports of the terminal after transmission of the CSI report.

6. At the terminal of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Receive CSI (channel state information) reporting related settings through upper layer signaling; Identifying a first number of CSI-RS (channel state information reference signal) antenna port sub-sets based on the above CSI reporting related settings; Identify a second subset of receive antenna ports; Based on the priorities associated with the CSI-RS antenna port sub-sets and the priorities associated with the receive antenna port sub-sets, determining at least one CSI-RS antenna port sub-set among the first number of CSI-RS antenna port sub-sets and determining at least one receive antenna port sub-set among the second number of receive antenna port sub-sets; determining one or more CSI parameters based on the one or more CSI-RS antenna port sub-sets and the one or more receive antenna port sub-sets; and A terminal configured to transmit a CSI report including one or more of the above CSI parameters.

7. In paragraph 6, The above first number of CSI-RS antenna port sub-sets correspond to different priorities, The second number of receiving antenna port sub-sets correspond to different priorities, If the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, If the priority associated with the above receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, A terminal wherein the order of priority between the CSI-RS antenna port sub-set related priorities and the receiving antenna port sub-set related priorities is predefined or determined by an explicit instruction or determined by an implicit instruction.

8. In paragraph 7, One CSI parameter is based on one CSI-RS antenna port sub-set and one receive antenna port sub-set, If the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, the number of the one or more receive antenna port sub-sets is based on the overhead of the CSI report, and reports for CSI parameters associated with the remaining receive antenna port sub-sets excluding the one or more receive antenna port sub-sets among the second number of receive antenna port sub-sets are dropped. If the priority associated with the receiving antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the number of the one or more CSI-RS antenna port sub-sets is based on the overhead of the CSI report, and reports on CSI parameters associated with the remaining CSI-RS antenna port sub-sets excluding the one or more CSI-RS antenna port sub-sets among the first number of CSI-RS antenna port sub-sets are dropped, The above CSI overhead is related to the processing capability of the terminal for the CSI report.

9. In paragraph 6, Each receive antenna port sub-set includes at least one of the plurality of receive antenna ports of the terminal, The number of receiving antenna ports included in each receiving antenna port sub-set is greater than or equal to the maximum number of transmission layers associated with the capability of the terminal, A terminal, wherein information about the number of receive antenna ports included in each receive antenna port sub-set is included in the CSI report.

10. In paragraph 6, A terminal, wherein the processor is configured to receive, through dynamic signaling, instruction information indicating activation or deactivation of one or more of the plurality of receiving antenna ports of the terminal after transmission of the CSI report.

11. In a method performed by a base station in a communication system, A step of identifying a first number of CSI-RS (channel state information reference signal) antenna port sub-sets; A step of transmitting CSI (channel state information) reporting related settings related to the first number of CSI-RS antenna port sub-sets to a terminal through upper layer signaling; and Comprising a step of receiving a CSI report including one or more CSI parameters from the terminal, The one or more CSI parameters are based on one or more CSI-RS antenna port sub-sets of the first number of CSI-RS antenna port sub-sets and one or more receive antenna port sub-sets of the second number of receive antenna port sub-sets of the terminal, A method wherein the one or more CSI-RS antenna port sub-sets and the one or more receive antenna port sub-sets are based on a CSI-RS antenna port sub-set-related priority and a receive antenna port sub-set-related priority.

12. In paragraph 11, The above first number of CSI-RS antenna port sub-sets correspond to different priorities, The second number of receiving antenna port sub-sets correspond to different priorities, If the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, A method wherein, if the priority associated with the above receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set, the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, and then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets.

13. In paragraph 11, A method comprising the step of transmitting, to the terminal through dynamic signaling, instruction information indicating activation or deactivation of one or more of the plurality of receiving antenna ports of the terminal after receiving the CSI report.

14. In the base station of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Identify a first number of CSI-RS (channel state information reference signal) antenna port sub-sets; Transmitting CSI (channel state information) reporting related settings related to the first number of CSI-RS antenna port sub-sets to the terminal through upper layer signaling; and is configured to receive a CSI report including one or more CSI parameters from the terminal, The one or more CSI parameters are based on one or more CSI-RS antenna port sub-sets of the first number of CSI-RS antenna port sub-sets and one or more receive antenna port sub-sets of the second number of receive antenna port sub-sets of the terminal, A base station, wherein the one or more CSI-RS antenna port sub-sets and the one or more receive antenna port sub-sets are based on a CSI-RS antenna port sub-set-related priority and a receive antenna port sub-set-related priority.

15. In paragraph 14, The above first number of CSI-RS antenna port sub-sets correspond to different priorities, The second number of receiving antenna port sub-sets correspond to different priorities, If the priority associated with the CSI-RS antenna port sub-set is higher than the priority associated with the receive antenna port sub-set, then the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets, and then the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, A base station, wherein the one or more CSI-RS antenna port sub-sets are determined based on different priorities corresponding to the first number of CSI-RS antenna port sub-sets after the one or more receive antenna port sub-sets are determined based on different priorities corresponding to the second number of receive antenna port sub-sets, if the priority associated with the receive antenna port sub-set is higher than the priority associated with the CSI-RS antenna port sub-set.

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