Method and apparatus for transmitting and receiving reference signal in wireless communication system

Abstract

The present invention relates to a communication technology in which an IoT technology is combined with a 5G communication system that supports a higher data transmission rate than a 4G system, and a system therefor. The present disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety-related services, etc.) based on the 5G communication technology and the IoT-related technology. The invention of the present disclosure proposes a method and apparatus for transmitting and receiving a reference signal for efficiently using a resource in a wireless communication system.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for transmitting or receiving a reference signal in a wireless communication system. Background Art

[0002] To meet the increased demand for wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "beyond 4G network" communication systems or "post-LTE" systems. 5G communication systems are believed to be implemented in ultra-high frequency (mmWave) frequency bands (e.g., the 60 GHz band) to achieve higher data rates. In order to reduce the propagation loss of radio waves in the ultra-high frequency segment and increase the transmission distance, beamforming, massive multiple-input multiple-output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies in 5G communication systems have been discussed. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), and receiver-side interference cancellation. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), as well as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have also been developed.

[0003] The Internet, a human-centric network of connected devices where humans generate and consume information, is now evolving into the Internet of Things (IoT), in which distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE) combines IoT technology and big data processing technologies through connectivity with cloud servers. Recent research has focused on technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology for IoT implementation, including sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC). This IoT environment can provide intelligent Internet technology (IT) services that create new value for human life by collecting and analyzing data generated between connected things. Through the convergence and combination of existing information technology (IT) and various industrial applications, IT can be applied to a variety of fields, including smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart devices, and advanced medical services.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (cloud RAN), a technology for processing big data, can also be considered an example of the convergence of 5G and IoT technologies. Summary of the Invention

[0005] [Technical Issues]

[0006] A technical task to be achieved by the present disclosure is to provide a method and apparatus for transmitting or receiving a reference signal for efficient uplink or downlink signal transmission / reception operation for various services in a mobile communication system.

[0007] [Solution to the problem]

[0008] A method for implementing a task performed by a terminal of a wireless communication system according to an embodiment of the present invention includes: receiving configuration information for configuring transmission configuration information (TCI) simulation from a base station; determining whether to perform TCI simulation based on the configuration information; if it is determined to perform TCI simulation, performing signal transmission or reception based on a quasi-collocation (QCL) assumption determined according to the TCI simulation, wherein the TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between multiple reference reference signals and multiple target reference signals.

[0009] A method performed by a base station of a wireless communication system, comprising: receiving terminal capability information from a terminal, the terminal capability information including information indicating that the terminal supports transmission configuration information (TCI) simulation; and sending configuration information for configuring TCI simulation to the terminal, wherein TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between multiple reference reference signals and multiple target reference signals.

[0010] A terminal of a wireless communication system includes: a transceiver; and a controller, configured to control to receive configuration information for configuring transmission configuration information (TCI) simulation from a base station, determine whether to perform TCI simulation based on the configuration information, and if it is determined to perform TCI simulation, perform signal transmission or reception based on a quasi-collocation (QCL) assumption determined with reference to the TCI simulation, wherein the TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between multiple reference reference signals and multiple target reference signals.

[0011] A base station of a wireless communication system includes: a transceiver; and a controller configured to control to receive terminal capability information from a terminal, the terminal capability information including information indicating that the terminal supports transmission configuration information (TCI) emulation, and to send configuration information for configuring TCI emulation to the terminal, wherein TCI emulation is a TCI configuration based on a one-to-many or many-to-one correspondence between multiple reference reference signals and multiple target reference signals.

[0012] [Beneficial Effects of the Invention]

[0013] The disclosed embodiments provide a method and apparatus for efficient uplink or downlink signal transmission or reception in a mobile communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a diagram showing a basic structure of a time-frequency domain as a radio resource area of ​​a 5G system according to an embodiment of the present disclosure;

[0015] Figure 2 is a diagram illustrating a time slot structure considered in a 5G system according to an embodiment of the present disclosure;

[0016] Figure 3 is a diagram showing an example of a configuration of a bandwidth section in a 5G communication system according to an embodiment of the present disclosure;

[0017] Figure 4 is a diagram illustrating an example of a process of switching bandwidth parts in a 5G communication system according to an embodiment of the present disclosure;

[0018] Figure 5 is a diagram illustrating an example of a control resource set (CORESET) for transmitting a downlink control channel in a 5G wireless communication system according to an embodiment of the present disclosure;

[0019] Figure 6 is a diagram illustrating a frequency axis resource allocation method in a 5G wireless communication system according to an embodiment of the present invention;

[0020] Figure 7 is a diagram showing an example of time axis resource allocation in NR according to an embodiment of the present disclosure;

[0021] Figure 8 is a diagram illustrating an example of time-axis resource allocation according to subcarrier spacings of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure;

[0022] Figure 9 is a diagram illustrating a radio protocol structure of a terminal and a base station in a single cell, carrier aggregation, and dual connectivity scenario according to an embodiment of the present disclosure;

[0023] Figure 10 is an example for illustrating a CSI-RS configuration according to an embodiment of the present disclosure;

[0024] Figure 11 is a diagram illustrating an example of an aperiodic CSI reporting method according to an embodiment of the present disclosure;

[0025] Figure 12 is a diagram illustrating examples of various operation scenarios of an SRS according to an embodiment of the present disclosure;

[0026] Figure 13 is a diagram showing an uplink transmission structure of a 5G or NR system according to an embodiment of the present disclosure;

[0027] Figure 14 is a diagram showing a structure for allocating an SRS to each subband according to an embodiment of the present disclosure;

[0028] Figure 15 A method for transmitting or receiving data by a base station and a terminal considering a downlink data channel and rate matching resources according to an embodiment of the present disclosure is shown;

[0029] Figure 16 is a diagram illustrating an uplink-downlink configuration considered in a 5G communication system;

[0030] Figure 17 is a diagram illustrating an example of a TRS pattern according to an embodiment of the present disclosure;

[0031] Figure 18A is a diagram showing another example of a TRS mode according to an embodiment of the present disclosure;

[0032] Figure 18B is a diagram showing another example of a TRS mode according to an embodiment of the present disclosure;

[0033] Figure 19 is a diagram showing a structure of a signal processing device including an antenna port / antenna panel / baseband processor of a terminal according to an embodiment of the present disclosure;

[0034] Figure 20 is a diagram illustrating an example of TCI simulation according to an embodiment of the present disclosure;

[0035] Figure 21 is a diagram illustrating another example of TCI simulation according to an embodiment of the present disclosure;

[0036] Figure 22 is a diagram illustrating an example of TCI simulation via measurement limitation according to an embodiment of the present disclosure;

[0037] Figure 23is a diagram illustrating an example of TCI simulation via a resource pool according to an embodiment of the present disclosure;

[0038] Figure 24 is a diagram illustrating a terminal operation sequence according to an embodiment of the present disclosure;

[0039] Figure 25 is a block diagram of a terminal according to an embodiment of the present disclosure; and

[0040] Figure 26 is a block diagram of a base station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0042] When describing the embodiments of the present disclosure, descriptions related to technical contents well known in the art and not directly related to the present disclosure will be omitted. The purpose of omitting unnecessary descriptions is to prevent confusion of the main idea of ​​the present disclosure and to convey the main idea more clearly.

[0043] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements have the same reference numerals.

[0044] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will be apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only for the purpose of fully disclosing the present disclosure and informing those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar figure marks represent the same or similar elements. In addition, when describing the present disclosure, when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, the detailed description of the known functions or configurations incorporated herein will be omitted. The terms to be described below are terms defined in consideration of the functions in the present disclosure and may differ according to the user, the user's intention or custom. Therefore, the definition of terms should be based on the content of the entire specification.

[0045] In the following description, a base station is an entity that allocates resources to a terminal and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, “downlink (DL)” refers to a radio link via which a base station sends a signal to a terminal, and “uplink (UL)” refers to a radio link via which a terminal sends a signal to a base station. In addition, in the following description, an LTE or LTE-A system may be described by way of example, but the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems may include a fifth-generation mobile communication technology (5G system, which may be used interchangeably with “new radio” and “NR”) developed outside of LTE-A, and in the following description, “5G” may be a concept covering existing LTE, LTE-A, or other similar services. In addition, based on the determination of those skilled in the art, the embodiments of the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0046] Here, it will be understood that each block of the flowchart and the combination of blocks in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can direct the computer or other programmable data processing device to operate in a specific manner so that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means for implementing the functions specified in the flowchart block or blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device, thereby producing a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flowchart blocks.

[0047] In addition, each block of the flowchart may represent a module, segment, or portion of code that includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions recorded in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in the reverse order, depending on the functions involved.

[0048] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have the meaning of being limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to run one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segmentation, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into smaller number elements or "units", or divided into larger number elements or "units". In addition, elements and "units" or can be implemented as one or more CPUs in a reproduction device or a secure multimedia card. In addition, the "unit" in the embodiment can include one or more processors.

[0049] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, although the embodiments of the present disclosure are described with respect to the methods and devices proposed therein, by taking the service of enhanced coverage as an example, the present disclosure is not limited to and applies to each embodiment, and can be used for a method of sending or receiving a data channel, a control channel, and a reference signal corresponding to another additional service by using all or some of one or more embodiments proposed in the present disclosure. Therefore, the embodiments of the present disclosure can be applied with some modifications within the scope of the present disclosure that do not significantly deviate from the scope of the present disclosure as judged by those skilled in the art.

[0050] In addition, when describing the present disclosure, if it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, a detailed description of a known function or configuration incorporated herein will be omitted. The terms described below are defined in consideration of the functions in the present disclosure and may vary depending on the user, the user's intention, or custom. Therefore, the definition of terms should be based on the content of the entire specification.

[0051] Wireless communication systems are evolving into broadband wireless communication systems for providing high-speed and high-quality packet data services using communication standards such as 3GPP's High Speed ​​Packet Access (HSPA), LTE {Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)}, LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), IEEE 802.16e, etc., as well as typical voice-based services.

[0052] As a typical example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme in the downlink (DL) and a single-carrier frequency division multiple access (SC-FDMA) scheme in the uplink (UL). The uplink refers to the radio link through which a user equipment (UE) (or mobile station (MS)) transmits data or control signals to a base station (BS) (eNode B), and the downlink refers to the radio link through which a base station transmits data or control signals to a UE. The above-mentioned multiple access scheme separates the data or control information of each user by allocating and operating time-frequency resources for transmitting data or control information to each user to avoid mutual overlap, that is, to establish orthogonality.

[0053] As a post-LTE communication system, the 5G communication system must freely reflect the diverse needs of users, service providers, and others, and therefore must support services that meet these needs. The services considered in the 5G communication system include enhanced mobile broadband (eMBB) communication, massive machine-type communication (mMTC), and ultra-reliable low-latency communication (URLLC).

[0054] eMBB is designed to provide higher data rates than those supported by existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, eMBB must provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink for a single base station. In addition, the 5G communication system must provide an increased user-perceived data rate as well as a maximum data rate to the UE. In order to meet this requirement, it is necessary to improve the transmission / reception technology including further enhanced multiple-input multiple-output (MIMO) transmission technology. In addition, the data rate required by the 5G communication system can be obtained using a frequency bandwidth greater than 20 MHz in a frequency band of 3 to 6 GHz, or 6 GHz or higher, instead of using a transmission bandwidth of up to 20 MHz in a frequency band of 2 GHz used in LTE to send signals.

[0055] Development is underway for bandwidth parting (BWP) technology, which is implemented by a base station within the entire carrier frequency band when supporting wide bandwidth, into multiple frequency bands that can be supported by each terminal. Specifically, when a base station supports BWP, if a specific terminal has limited bandwidth capabilities, a smaller frequency band can be supported for the terminal via the BWP. This reduces the frequency band by changing the BWP, while also reducing the terminal's energy consumption. Furthermore, by supporting different frame structures for each of the multiple BWPs, various services for a single terminal can be supported without latency by changing the BWP. BWP technology can be applied to control channels or data channels, which are one-to-one correspondences between a predetermined terminal and the base station. Furthermore, for common signals transmitted by the base station to multiple terminals within the system, such as synchronization signals, the physical broadcast channel (PBCH), and control and data channels used to transmit system information, BWP can be applied to reduce base station energy consumption by transmitting the control and data channels only within the configured BWP.

[0056] In addition, mMTC is considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to effectively provide the Internet of Things, mMTC has requirements such as supporting the connection of a large number of UEs in a cell, enhanced coverage of UEs, improved battery time, and reducing the cost of UEs. Since the Internet of Things provides communication functions while providing to various sensors and various devices, it must support a large number of UEs in a cell (e.g., 1,000,000 UEs / km2). In addition, UEs supporting mMTC may require wider coverage than other services provided by the 5G communication system because the UE may be located in a shadow area such as the basement of a building, which is not covered by the cell due to the characteristics of the service. UEs supporting mMTC must be configured to be cheap and require a very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the battery of the UE.

[0057] Finally, URLLC is a cellular-based mission-critical wireless communication service that can be used for remote control of robots or machines, industrial automation, drones, remote health care, emergency alerts, etc. Therefore, URLLC must provide communications with ultra-low latency and ultra-high reliability. For example, services that support URLLC must meet an air interface latency of less than 0.5ms and also require a packet error rate of 10-5 or lower. Therefore, for services that support URLLC, the 5G system must provide a transmission time interval (TTI) that is shorter than that of other services, and must also allocate a large amount of resources in the frequency band to ensure the reliability of the communication link.

[0058] The three services in the 5G communication system (hereinafter referred to as "5G system"), namely, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in a single system. In this case, different transmission / reception technologies and transmission / reception parameters can be used between the services to meet the different requirements of the corresponding services.

[0059] In the following description, higher layer signaling may include radio resource control (RRC) signaling (system information block (SIB), master information block (MIB), etc. may be included in RRC signaling), medium access control (MAC) control element (CE), etc., and L1 signaling may include downlink control information, uplink control information, etc.

[0060] Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the accompanying drawings.

[0061] Figure 1 It is a diagram showing the basic structure of the time-frequency domain as a radio resource area of ​​the 5G communication system.

[0062] exist Figure 1 In the diagram, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time domain and the frequency domain is a resource element (RE) 101, which can be defined as one orthogonal frequency division multiplexing (OFDM) symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) 102 on the time axis and one subcarrier 103 on the frequency axis. 12 consecutive REs (for example) can constitute a resource block (RB) 104. Consecutive OFDM symbols may constitute a subframe 110 .

[0063] Figure 2 is a diagram showing a time slot structure considered in a 5G system.

[0064] Figure 2 An example of the structure of a frame 200, a subframe 201, and a time slot 202 is shown. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, so one frame 200 may include a total of 10 subframes 201. One time slot 202 or 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). One subframe 201 may include one or more time slots 202 and 203, and the number of time slots 202 and 203 per subframe 201 may vary according to μ 204 and 205, ie, configured values ​​for subcarrier spacing.

[0065] exist Figure 2In the example of FIG, the time slot structure of the case where μ = 0204 and the case where μ = 1205 are shown, where μ is the subcarrier spacing configuration value. If μ = 0204, one subframe 201 may include one time slot 202, and if μ = 1205, one subframe 201 may include two time slots 203. That is, the number of time slots per subframe is can vary depending on the configured value μ for the subcarrier spacing, and therefore the number of slots per frame Can change, and and The configuration μ according to the corresponding subcarrier spacing can be defined in Table 1 below.

[0066] [Table 1]

[0067]

[0068] In a 5G wireless communication system, a synchronization signal block (SSB, SS block, SS / PBCH block, etc. may be used interchangeably) may be transmitted for initial access, and the synchronization signal block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). During initial access when a terminal first accesses the system, the terminal may first acquire downlink time and frequency domain synchronization from the synchronization signal via a cell search, and may obtain a cell ID. The synchronization signal may include a PSS and an SSS.

[0069] The terminal can receive the PBCH from the base station, which is used to transmit the Master Information Block (MIB), to obtain basic parameter values ​​and system information related to transmission or reception, such as system bandwidth or related control information. Based on this information, the terminal can decode the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) to obtain the System Information Block (SIB). The terminal then exchanges an identity with the base station via random access and initially accesses the network through operations such as registration and authentication.

[0070] The synchronization signal is a reference signal used for cell search and can be transmitted by applying a subcarrier spacing (e.g., phase noise) suitable for the channel environment to each frequency band. A 5G base station can transmit multiple synchronization signal blocks depending on the number of analog beams to be operated. The PSS and SSS can be mapped to 12 RBs and transmitted, and the PBCH can be mapped to 24 RBs and transmitted.

[0071] Subsequently, a bandwidth part (BWP) configuration in a 5G communication system will be described in detail with reference to the accompanying drawings.

[0072] Figure 3 is a diagram showing an example of a configuration of a bandwidth portion used in a 5G communication system.

[0073] Figure 3 An example is shown in which the terminal bandwidth (UE bandwidth) 300 is configured with two bandwidth parts, bandwidth part #1 305 and bandwidth part #2 310. The base station can configure one or more bandwidth parts for the terminal and can configure the following information for each bandwidth part.

[0074] [Table 2]

[0075]

[0076] The present disclosure is not limited to the above examples, and in addition to configuration information, various parameters related to bandwidth parts may be configured for the terminal. The base station may transmit the information to the terminal via higher layer signaling (e.g., radio resource control (RRC) signaling). At least one of the one or more configured bandwidth parts may be activated. Whether the configured bandwidth part is active or transmitted from the base station to the terminal in a semi-static manner via RRC signaling, or may be dynamically transmitted via downlink control information (DCI).

[0077] According to some embodiments, a base station may configure an initial bandwidth part (BWP) for a terminal for initial access via a master information block (MIB) before an RRC connection is established. More specifically, during initial access, the terminal may receive configuration information for a search space and a control region (control resource set (CORESET)). A physical downlink control channel (PDCCH) for receiving system information required for initial access (which may correspond to remaining system information (RMSI) or system information block 1 (SIB1)) may be transmitted via the MIB. Each of the search space and control region configured via the MIB may be considered to be an identifier (ID) 0. The base station may notify the terminal of configuration information, such as frequency allocation information, time allocation information, and a parameter set for control region #0, via the MIB. Furthermore, the base station may notify the terminal of configuration information for the monitoring period and timing for control region #0, i.e., configuration information for search space #0, via the MIB. The terminal may consider the frequency domain of region #0 configured to control the access region #0 obtained from the MIB as the initial bandwidth part for initial access. In this case, the ID of the initial bandwidth part may be considered to be 0.

[0078] The configuration of the bandwidth portion supported by the 5G system can be used for various purposes.

[0079] According to some embodiments, if the bandwidth supported by the terminal is less than the system bandwidth, this can be supported by bandwidth portion configuration. For example, the base station can configure the frequency location of the bandwidth portion for the terminal (configuration information 2), so that the terminal can send or receive data at a specific frequency location within the system bandwidth.

[0080] According to some embodiments, to support different digital hierarchies, a base station may configure multiple bandwidth parts for a terminal. For example, to support data transmission and reception using a 15 kHz subcarrier spacing and a 30 kHz subcarrier spacing for a terminal, two bandwidth parts may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth parts may be frequency-division multiplexed, and when data is to be transmitted or received with a specific subcarrier spacing, the bandwidth part configured with the subcarrier spacing may be activated.

[0081] According to some embodiments, in order to reduce the power consumption of the terminal, the base station may configure bandwidth parts with different bandwidth sizes for the terminal. For example, if the terminal supports a very large bandwidth, such as a bandwidth of 100 MHz, and always sends or receives data via the corresponding bandwidth, very large power consumption may occur. In particular, in the absence of business, performing monitoring on unnecessary downlink control channels with a large bandwidth of 100 MHz may be very inefficient in terms of power consumption. In order to reduce the power consumption of the terminal, the base station may configure a bandwidth part with a relatively small bandwidth for the terminal, such as a bandwidth part of 20 MHz. In the absence of business, the terminal can perform monitoring in the 20 MHz bandwidth part, and when data is generated, the terminal can send or receive data by using the 100 MHz bandwidth part according to the instructions of the base station.

[0082] In the method for configuring the bandwidth part, the terminal before the RRC connection can receive the configuration information of the initial bandwidth part via the master information block (MIB) during the initial access. More specifically, the terminal can be configured to have a control region for a downlink control channel (which can be used interchangeably with a control resource set (CORESET)), via which downlink control information (DCI) for scheduling system information blocks (SIBs) can be sent from the MIB of the physical broadcast channel (PBCH). The bandwidth of the control region configured via the MIB can be considered as the initial bandwidth part, and the terminal can receive the physical downlink shared channel (PDSCH) via the configured initial bandwidth part, through which the SIBs are sent. In addition to receiving SIBs, the initial bandwidth part can be used for other system information (OSI), paging, and random access.

[0083] When one or more bandwidth parts are configured for a terminal, the base station can instruct the terminal to change the bandwidth part by using the bandwidth part indicator field in the DCI. Figure 3In the embodiment, if the current active bandwidth part of the terminal is bandwidth part #1 305, the base station can indicate bandwidth part #2 310 to the terminal via the bandwidth part indicator in the DCI, and the terminal can switch the bandwidth part to the bandwidth part #2 310 indicated by the bandwidth part indicator in the received DCI.

[0084] As described above, the DCI-based switching of the bandwidth part can be indicated by the DCI for scheduling the PDSCH or the physical uplink shared channel (PUSCH), and therefore, when receiving a request for switching the bandwidth part, the terminal may need to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI, which is easy in switching the bandwidth part. To this end, in this standard, for example, the delay time (T BWP ) requirements and can be defined below.

[0085] [Table 3]

[0086]

[0087] The bandwidth part switching delay time requirement supports type 1 or type 2 according to the terminal capability. The terminal can report the supportable bandwidth part delay time type to the base station.

[0088] Figure 4 is a diagram illustrating an example of a bandwidth switching method according to an embodiment of the present invention.

[0089] refer to Figure 4 According to the above requirement of bandwidth part switching delay time, when the terminal receives 415 DCI including bandwidth part switching indicator in time slot #1 430, the terminal can switch to the next channel no later than time slot n+T BWP The switching to the new bandwidth part indicated by the bandwidth part switching indicator is completed at the time point of 410, and the data channel scheduled by the corresponding DCI can be transmitted or received in the switched new bandwidth part 410. When the base station is to schedule the data channel with the new bandwidth part, the bandwidth part switching delay time (T BWP ) 420 to determine the time domain resource allocation for the data channel. That is, when the base station schedules a data channel with a new bandwidth part, the method of determining the time domain resource allocation for the data channel may include scheduling the data channel after the bandwidth part switching delay time (time slot #2, time slot #3) 435 and 440. Therefore, the terminal may not expect that the DCI indicating the bandwidth part switching indicates a delay time greater than the bandwidth part switching delay time (T BWP )420 is a value of a smaller time slot offset (K0 or K2).

[0090] If a terminal receives a DCI indicating bandwidth part switching (e.g., DCI format 1_1 or 0_1), the terminal may not perform any transmission or reception during a time interval from the third symbol of the time slot in which the PDCCH including the DCI is received to the start point of the time slot indicated by the time slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, when the terminal receives a DCI indicating bandwidth part switching in time slot n, and the time slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of time slot n to the symbol before time slot n+K (i.e., the last symbol in time slot n+K-1).

[0091] Subsequently, a method of configuring transmission / reception-related parameters for each bandwidth section in the 5G system will be described.

[0092] The terminal may be configured with one or more bandwidth parts by the base station, and may be additionally configured with parameters (e.g., configuration information related to uplink / downlink data channels and control channels) for transmission or reception of each configured bandwidth part. Figure 3 In the embodiment, when the terminal is configured with bandwidth part #1 305 and bandwidth part #2 310, the terminal may be configured with transmission / reception parameters #1 for bandwidth part #1 305, and may be configured with transmission / reception parameters #2 for bandwidth part #2 310. When bandwidth part #1 305 is activated, the terminal may perform transmission to or reception from the base station based on transmission / reception parameters #1, and when bandwidth part #2 310 is activated, the terminal may perform transmission to or reception from the base station based on transmission / reception parameters #2.

[0093] More specifically, the base station may configure the following parameters for the terminal.

[0094] First, the following information can be configured for the uplink bandwidth section.

[0095] [Table 4]

[0096]

[0097]

[0098]

[0099] According to the above table, the base station can configure parameters related to specific cell (or public cell or public) transmission for the terminal (for example, parameters related to the random access channel (RACH), uplink control channel (physical uplink control channel (PUCCH) and uplink data channel (physical uplink shared channel) (corresponding to BWP-UplinkCommon)). The base station can configure parameters related to specific UE (or UE-dedicated) transmission for the terminal (for example, parameters related to sounding reference signal (SRS), PUCCH, PUSCH and unlicensed uplink transmission (configured granted PUSCH)) (corresponding to BWP-UplinkDedicated).

[0100] Then, the following information can be configured for the downlink bandwidth portion.

[0101] [Table 5]

[0102]

[0103]

[0104] According to the above table, the base station can configure parameters related to specific cell (or public cell or public) reception for the terminal (for example, parameters related to the downlink control channel (physical downlink control channel (PDCCH)) and the downlink data channel (physical downlink shared channel)) (corresponding to BWP downlink common). The base station can configure parameters related to specific UE (or UE dedicated) reception for the terminal (for example, parameters related to radio link monitoring (RLM), PDCCH, PDSCH and non-authorized downlink data transmission (semi-persistently scheduled PDSCH) (corresponding to BWP-UplinkDedicated)).

[0105] Figure 5 2 is a diagram showing an example of a control resource set (CORESET) for transmitting a downlink control channel in a 5G wireless communication system. Figure 5 An example is shown in which a terminal bandwidth portion (UE bandwidth portion) 510 is configured on the frequency axis, and two control resource sets (control resource set #1 501 and control resource set #2 502) are configured within a time slot 520 on the time axis. The control resource sets 501 and 502 can be configured in specific frequency resources 503 within the entire UE bandwidth portion 510 on the frequency axis. One or more OFDM symbols can be configured on the time axis and can be defined as a control resource set duration 504. Figure 5In the example shown, control resource set #1 501 may be configured to have a control resource set duration of 2 symbols, and control resource set #2 502 may be configured to have a control resource set duration of 1 symbol.

[0106] The control resources set in the 5G system can be configured for the terminal by the base station via higher-layer signaling (e.g., system information, master information block (MIB), and radio resource control (RRC) signaling). Configuring a control resource set for the terminal means providing information such as the identifier of the control resource set, the frequency location of the control resource set, and the symbol length of the control resource set. For example, the information provided for configuring the control resource set is as follows.

[0107] [Table 6]

[0108]

[0109]

[0110] In the 5G system, the control resource set may include N in the frequency domain RB CORESET RB, and may include N on the time axis symbol CORESET ∈{1, 2, 3} symbols. A CCE may include 6 REGs, and for 1 OFDM symbol period, a REG may be defined as 1 RB. In a control resource set, the REGs may be indexed in time priority order starting from REG index 0 of the first OFDM symbol (lowest RB) from the control resource set.

[0111] The 5G system supports both interleaved and non-interleaved schemes as methods of transmitting PDCCH. The base station can configure the terminal via higher-layer signaling whether to perform interleaved or non-interleaved transmission for each control resource set. Interleaving can be performed in units of REG bundles. A REG bundle can be defined as a set of one or more REGs. Based on the interleaved or non-interleaved transmission configured from the base station, the terminal can determine the CCE to REG mapping scheme in the corresponding control resource set according to the following method.

[0112] [Table 7]

[0113]

[0114] The basic unit of the downlink control channel, i.e., REG, may include the RE to which the DCI is mapped and the demodulation reference signal (DMRS) for decoding the RE, i.e., the area to which the reference signal (which can be used interchangeably with the reference signal (RS)) is mapped. Three DMRS REs may be included in one REG. The number of CCEs required to send the PDCCH may be 1, 2, 4, 8, or 16, depending on the aggregation level (AL), and different numbers of CCEs may be used to achieve link adaptation of the downlink control channel. For example, if AL=L, a single downlink control channel may be sent via L CCEs.

[0115] The terminal needs to detect the signal without knowing the information on the downlink control channel, which defines a search space representing a set of CCEs for blind decoding. A search space is a set of downlink control channel candidates including CCEs. For each CCE, the terminal needs to attempt to decode at a given aggregation level. Since there are various aggregation levels that form a bundle with 1, 2, 4, 8, or 16 CCEs, the terminal may have multiple search spaces. A search space set can be defined as a set of search spaces at all configured aggregation levels.

[0116] The search space can be classified into a common search space and a terminal-specific (UE-specific) search space. A certain group of terminals or all terminals can check the common search space of the PDCCH in order to receive common cell control information, such as dynamic scheduling of system information or paging messages. For example, the terminal can receive PDSCH scheduling allocation information for transmitting SIBs including cell operator information, etc. by checking the common search space of the PDCCH. Since a certain group of terminals or all terminals need to receive the PDCCH, the common search space can be defined as a set of predetermined CCEs. Scheduling allocation information for PDSCH or PUSCH for a specific UE can be received by checking the specific UE search space of the PDCCH. The specific UE search space can be specifically defined based on the identity of the terminal and the function of various system parameters.

[0117] In the 5G system, the parameters of the search space for PDCCH can be configured for the terminal by the base station via higher layer signaling (e.g., SIB, MIB, and RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring timing for the search space in units of symbols in a time slot, the search space type (common search space or UE-specific search space), the combination of RNTI and DCI format to be monitored in the search space, the control resource set index for monitoring the search space, etc. For example, the parameters for the PDCCH search space may include the following information.

[0118] [Table 8]

[0119]

[0120]

[0121]

[0122] Based on the configuration information, the base station may configure one or more search space sets for the terminal. According to some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal. The terminal may be configured to monitor DCI format A scrambled with X-RNTI in the common search space in search space set 1, and may be configured to monitor DCI format B scrambled with Y-RNTI in the UE-specific search space in search space set 2.

[0123] Depending on the configuration information, one or more search space sets may exist in a common search space or a UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0124] In the common search space, the following combinations of DCI formats and RNTIs may be monitored. Of course, the present disclosure is not limited to the following embodiments.

[0125] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, Si-RNTI

[0126] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0127] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0128] -DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0129] -DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0130] In the search space of a specific UE, the following combinations of DCI formats and RNTIs may be monitored. Of course, the present disclosure is not limited to the following embodiments.

[0131] -DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0132] -DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0133] The specified RNTI may be defined and used as follows.

[0134] Cell RNTI (C-RNTI): used for PDSCH scheduling for a specific UE

[0135] Temporary cell RNTI (TC-RNTI): used for PDSCH scheduling of specific UEs

[0136] Configured Scheduling RNTI (CS-RNTI): used for semi-statically configured UE-specific PDSCH scheduling

[0137] Random Access RNTI (RA-RNTI): used for scheduling PDSCH during random access Paging RNTI (P-RNTI): used for scheduling the PDSCH on which paging is sent

[0138] System Information RNTI (SI-RNTI): used to schedule the PDSCH on which system information is sent. Interruption RNTI (INT-RNTI): used to indicate whether to puncture the PDSCH.

[0139] Transmit power control for PUSCH RNTI (TPC-PUSCH-RNTI): used to indicate the power control command for PUSCH

[0140] Transmit power control for PUCCH RNTI (TPC-PUCCH-RNTI): used to indicate the power control command for PUCCH

[0141] Transmit power control for SRS RNTI (TPC-SRS-RNTI): used to indicate the power control command for SRS

[0142] The DCI format specified above may follow the following definition.

[0143] [Table 9]

[0144]

[0145]

[0146] In the 5G system, the search space of the aggregation level L in the control resource set p and the control resource set s can be expressed as the following equation.

[0147] [Equation 1]

[0148]

[0149] -L: aggregation level

[0150] -N CI : Carrier index

[0151] -N CCE，p : The total number of CCEs in the control resource set p

[0152] -n μ s，f : time slot index

[0153] -M (L) p，s，max : Number of PDCCH candidates at aggregation level L

[0154] -m snCI =0,...,M (L) p，s，max -1: Index of PDCCH candidate for aggregation level L

[0155] -i=0,...,L-1

[0156] - A0=39827, A1=39829, A2=39839, D=65537

[0157] -n RNTI : Terminal identity

[0158] In the case of a common search space, Y_(p,n μ s，f ) can correspond to 0.

[0159] In the case of a specific UE search space, Y_(p,n μ s，f ) may correspond to a value that varies according to the time index and the terminal's identifier (the ID or C-RNTI configured by the base station for the terminal).

[0160] Hereinafter, a detailed description of a method for configuring a transmission configuration indication (TCI) state will be provided. The TCI state is a device for indicating or exchanging quasi-coordinate (QCL) information between a terminal and a base station in a 5G communication system.

[0161] The base station is able to configure and indicate the TCI state between two different RSs or channels through appropriate signaling in order to notify the QCL relationship between different RSs or channels. Different RSs or channels indicated by QCL: When estimating the channel via a reference RS antenna port A (reference RS#A) and another target RS antenna port B (target RS#B) in a QCL relationship, the terminal is allowed to apply some or all of the large-scale channel parameters estimated in antenna port A to the channel measurement from antenna port B. It may be necessary to associate different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Therefore, NR supports four types of QCL relationships, as shown in Table 10 below.

[0162] [Table 10]

[0163]

[0164] Spatial RX parameters may refer to some or all of various parameters, such as angle of arrival (AoA), power angular spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0165] The QCL relationship can be configured for the terminal via the RRC parameters TCI-State and QCL-Info, as shown in Table 11 below. Referring to Table 11, the base station can configure one or more TCI states for the terminal to notify the RS (i.e., the target RS) of up to two QCL relationships (qcl-type 1 and qcl-type 2) of the ID of the reference TCI state. Each QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type, as shown in Table 10.

[0166] [Table 11]

[0167]

[0168] In order to ensure the channel estimation performance of the terminal, the types of target RS and reference RS that the base station can configure for TCI and QCL can be determined according to specific rules.

[0169] For periodic CSI-RS resources in an NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, the UE shall expect the TCI-State to indicate one of the following quasi-parity types:

[0170] - "QCL Type C" with SS / PBCH blocks, and, when applicable, "QCL Type D" with the same SS / PBCH blocks

[0171] - "QCL-Type C" with SS / PBCH blocks and, where applicable, "QCL-Type D" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition, or

[0172] For aperiodic CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, the UE shall expect the TCI-State to indicate "QCL-Type A" with the periodic CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, "QCL-Type D" with the same periodic CSI-RS resources.

[0173] For CSI-RS resources in an NZP-CSI-RS-ResourceSet configured without the higher layer parameter trs-Info and without higher layer parameter repetition, the UE shall expect the TCI-State to indicate one of the following quasi-parity types:

[0174] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, "QCL-Type D" with the same CSI-RS resources, or

[0175] - with "QCL-Type A" for CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, with "QCL-Type D" for SS / PBCH blocks, or

[0176] - has "QCL-Type A" for CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, has "QCL-Type D" for CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition, or

[0177] - When "QCL-Type D" is not applicable, having CSI-RS resources "QCL-Type B" in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info.

[0178] For CSI-RS resources in an NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition, the UE shall expect the TCI-State to indicate one of the following quasi-co-located position types:

[0179] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, "QCL-Type D" with the same CSI-RS resources, or

[0180] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, where applicable, "QCL-Type D" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition, or

[0181] - "QCL-Type C" with SS / PBCH blocks, and when applicable, "QCL-Type D" with the same SS / PBCH blocks.

[0182] For the DM-RS of the PDCCH, the UE shall expect the TCI-State to indicate one of the following quasi-parity types:

[0183] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, "QCL-Type D" with the same CSI-RS resources, or

[0184] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, where applicable, "QCL-Type D" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition, or

[0185] - "QCL-Type A" having CSI-RS resources in an NZP-CSI-RS-ResourceSet configured without higher layer parameter trs-Info and without higher layer parameter repetition, and, when applicable, "QCL-Type D" having the same CSI-RS resources.

[0186] For the DM-RS of the PDSCH, the UE shall expect the TCI-State to indicate one of the following quasi-parity types:

[0187] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, when applicable, "QCL-Type D" with the same CSI-RS resources, or

[0188] - "QCL-Type A" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, where applicable, "QCL-Type D" with CSI-RS resources in NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition, or

[0189] - "QCL-Type A" with CSI-RS resources in an NZP-CSI-RS-ResourceSet configured without higher layer parameter trs-Info and without higher layer parameter repetition, and, when applicable, "QCL-Type D" with the same CSI-RS resources.

[0190] Hereinafter, a time and frequency resource allocation method for data transmission in NR will be described.

[0191] In NR, in addition to the frequency axis resource candidate allocation indicated via BWP, the following detailed frequency axis resource allocation (frequency domain resource allocation (FD-RA)) method can also be provided. Figure 6 : is a diagram showing an example of frequency-axis resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure.

[0192] Figure 6 is a diagram showing three frequency axis resource allocation methods of type 0 600, type 1 605, and dynamic switch 610 that can be configured via higher layers in NR.

[0193] refer to Figure 6 If the terminal is configured 600 to use only resource type 0 via higher layer signaling, some downlink control information (DCI) used to allocate PDSCH to the terminal has N RBG The conditions for this case will be described later. In this case, N RBG Refers to the number of resource block groups (RBGs) determined according to the higher layer parameters (or higher layer signaling parameters) of the BWP size and rbg size assigned by the BWP indicator, as shown in the following [Table 12], and data is in the Figure 1 It is sent in the indicated RBG.

[0194] [Table 12]

[0195] Bandwidth portion size Configuration 1 Configuration 2 1-36 2 4 37-72 4 8 73-144 8 16 145-275 16 16

[0196] If the terminal is configured 605 via higher layer signaling to use only resource type 1, some DCIs used to allocate PDSCH to the terminal have a The frequency axis resource allocation information of the 100 bits is provided. The conditions of this case will be described later. Based on this, the base station can configure the starting VRB 620 and the length 625 of the frequency axis resources continuously allocated therefrom.

[0197] If the terminal is configured 610 to use resource type 0 and resource type 1 via higher layer signaling, some DCI for allocating PDSCH to the corresponding terminal has frequency axis resource allocation information including a bit of a large value 635 in a payload 615 for configuration of resource type 0 and payloads 620 and 625 for configuration of resource type 1. The conditions of this case will be described later. In this case, one bit may be added to the first part (MSB) of the frequency axis resource allocation information in the DCI, and if the corresponding bit is 0, the use of resource type 0 may be indicated, and if the corresponding bit is 1, the use of resource type 1 may be indicated.

[0198] Figure 7 is a diagram illustrating an example of timeline resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure.

[0199] Reference Figure 7 The base station can dynamically indicate the OFDM symbol starting position 700 and length 705 in a time slot 710 via DCI, and the scheduling offset K0 value and subcarrier spacing (SCS) (μ PDSCH and μ PDCCH ) to indicate the time axis position of the PDSCH resource.

[0200] Figure 8 is a diagram illustrating an example of time-axis resource allocation according to subcarrier spacings of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure.

[0201] refer to Figure 8 , if the subcarrier spacing of the data channel is the same as the subcarrier spacing of the control channel in 800 (μ PDSCH =μ PDCCH ), the time slot numbers of the data channel and the control channel are the same, so the base station and the terminal can identify the scheduling offset according to the predetermined time slot offset K0. On the other hand, if the subcarrier spacing (SCS) of the data channel and the control channel is different (μ PDSCH ≠μ PDCCH), the time slot numbers of the data channel and the control channel are different, so the base station and the terminal can identify the scheduling offset according to the predetermined time slot offset K0 based on the subcarrier spacing of the PDCCH.

[0202] Despite Figure 8 The offset analysis method for the case where the subcarrier spacing between the data channel and the control channel is the same or different has been described above, but the above method is not limited to this. Similarly, the method can also be applied to the case where the subcarrier spacing between different channels or reference signals is the same or different, such as the case where the subcarrier spacing between the CSI-RS and the control channel or the subcarrier spacing between the SRS and the control channel is the same or different.

[0203] In order for the terminal to efficiently receive the control channel, NR provides various types of DCI formats shown in Table 9 below according to the purpose.

[0204] For example, the base station may use DCI format 0_0 or DCI format 0_1 ​​to allocate (schedule) a PDSCH to one cell.

[0205] When sent with a CRC scrambled by a Cell Radio Network Temporary Identifier (C-RNTI), a Configured Scheduling RNTI (CS-RNTI), or a New RNTI, DCI format 0_1 ​​includes at least the following information:

[0206] -DCI format identifier (1 bit): DCI format indicator that is always configured as 1

[0207] - Frequency domain resource allocation (NRBG bit or bit): indicates frequency axis resource allocation, wherein when monitoring DCI format 1_0 in a specific UE search space, Indicates the size of the active DL BWP and, among other things, Indicates the size of the initial DL BWP. NRBG is the number of resource block groups. For detailed methods, refer to frequency axis resource allocation.

[0208] -Time domain resource allocation (bits 0 to 4): indicates the time axis resource allocation according to the above description

[0209] - VRB to PRB mapping (1 bit): 0 indicates non-interleaved VRB to PRB mapping, while 1 indicates interleaved VRB to PRB mapping.

[0210] - Modulation and coding scheme (5 bits): Indicates the modulation order and coding rate used for PDSCH transmission

[0211] - New data indicator (1 bit): Indicates whether the PDSCH corresponds to an initial transmission or a retransmission according to the switching

[0212] - Redundancy version (2 bits): Indicates the redundancy version used for PDSCH transmission

[0213] -HARQ process number (4 bits): indicates the HARQ process number used for PDSCH transmission

[0214] - Downlink Allocation Index (2 bits): DAI indicator

[0215] - TPC command for scheduled PUCCH (2 bits): PUCCH power control indicator

[0216] -PUCCH resource indicator (3 bits): A PUCCH resource indicator indicating one of eight resources configured via a higher layer

[0217] -PDSCH to HARQ_feedback timing indicator (3 bits): HARQ feedback timing indicator indicating one of eight feedback timing offsets configured via higher layers

[0218] In case that DCI format 1_1 is transmitted together with a CRC scrambled by a cell radio network temporary identifier (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a new RNTI, DCI format 1_1 includes at least the following information.

[0219] - DCI format identifier (1 bit): DCI format indicator, which is always configured as 1

[0220] - Carrier indicator (0 or 3 bits): Indicates the CC (or cell) in which the PDSCH allocated by the corresponding DCI is transmitted

[0221] - Bandwidth part indicator (0, 1 or 2 bits): Indicates the BWP over which the PDSCH allocated by the corresponding DCI is transmitted

[0222] - Frequency domain resource allocation (payload is determined based on frequency axis resource allocation): indicates frequency axis resource allocation, where Indicates the size of the active DL BWP. For detailed methods, refer to Frequency Axis Resource Allocation.

[0223] -Time domain resource allocation (bits 0 to 4): indicates the time axis resource allocation according to the above description

[0224] - VRB to PRB mapping (0 or 1 bit): 0 indicates non-interleaved VRB to PRB mapping, while 1 indicates interleaved VRB to PRB mapping. Bit 0 corresponds to the case where frequency axis resource allocation is configured as resource type 0.

[0225] -PRB packet size indicator (0 or 1 bit): 0 bit if the higher layer parameter of prb-BundlingType is not configured or configured as "static", and 1 bit if the higher layer parameter of prb-BundlingType is configured as "dynamic".

[0226] -Rate matching indicator (0 bit, 1 bit or 2 bits): indicates the rate matching mode

[0227] -ZP CSI-RS trigger (0, 1, or 2 bits): indicator used to trigger aperiodic ZP CSI-RS

[0228] For transport block 1:

[0229] - Modulation and coding scheme (5 bits): Indicates the modulation order and coding rate used for PDSCH transmission

[0230] - New data indicator (1 bit): Indicates whether the PDSCH corresponds to an initial transmission or a retransmission according to the switching

[0231] - Redundancy version (2 bits): Indicates the redundancy version used for PDSCH transmission

[0232] For transport block 2:

[0233] - Modulation and coding scheme (5 bits): Indicates the modulation order and coding rate used for PDSCH transmission

[0234] - New data indicator (1 bit): Indicates whether the PDSCH corresponds to an initial transmission or a retransmission according to the switching

[0235] - Redundancy version (2 bits): Indicates the redundancy version used for PDSCH transmission

[0236] -HARQ process number (4 bits): indicates the HARQ process number used for PDSCH transmission

[0237] - Downlink Allocation Index (0, 2, or 4 bits): Downlink Allocation Index (DAI) indicator

[0238] - TPC command for scheduled PUCCH (2 bits): PUCCH power control indicator

[0239] -PUCCH resource indicator (3 bits): A PUCCH resource indicator indicating one of eight resources configured via a higher layer

[0240] -PDSCH to HARQ_feedback timing indicator (3 bits): HARQ feedback timing indicator indicating one of eight feedback timing offsets configured via higher layers

[0241] - Antenna port (4, 5 or 6 bits): Indicates the DMRS port and CDM group with no data

[0242] -Transmission Configuration Indicator (0 or 3 bits): TCI indicator

[0243] -SRS request (2 or 3 bits): SRS transmission request indicator

[0244] -CBG transmission information (0, 2, 4, 6, or 8 bits): An indicator indicating whether a code block group is transmitted in the allocated PDSCH. 0 indicates that the corresponding CBG is not transmitted, and 1 indicates that the corresponding CBG is transmitted.

[0245] -CBG clear information (0 or 1 bit): an indicator indicating whether the previous CBG is contaminated. 0 means that the previous CBG may be contaminated, while 1 means that the previous CBG is usable (combinable) when receiving the retransmission.

[0246] -DMRS sequence initialization (0 or 1 bit): DMRS scrambling ID selection indicator

[0247] The number of DCIs of different sizes that the terminal can receive for each time slot in the corresponding cell is up to 4. The number of DCIs of different sizes that the terminal can receive for each time slot in the corresponding cell is up to 3 and scrambled with the C-RNTI.

[0248] Here, antenna port indication may be indicated by the following Tables 13 to 16.

[0249] [Table 13] Antenna Port (1000+DMRS Port), DMRS Type = 1, Maximum Length (maxLength) = 1

[0250]

[0251]

[0252] [Table 14] Antenna Port (1000 + DMRS Port), DMRS Type = 1, Maximum Length = 2

[0253]

[0254] [Table 15] Antenna Port (1000 + DMRS Port), DMRS Type = 2, Maximum Length = 1

[0255]

[0256] [Table 16-1] Antenna Port (1000 + DMRS Port), DMRS Type = 2, Maximum Length = 2

[0257]

[0258] [Table 16-2] Antenna Port (1000 + DMRS Port), DMRS Type = 2, Maximum Length = 2

[0259]

[0260] It is preferable to understand that Tables 16-1 and 16-2 are connected to each other.

[0261] When the DMRS type is 1 and the maximum length is 1, Table 13 is used, and when the DMRS type is 1 and the maximum length is 2, Table 14 is used. If the DMRS type is 2 and the maximum length is 1, the DMRS port to be used is indicated based on Table 15, and if the DMRS type is 2 and the maximum length is 2, the DMRS port to be used is indicated based on Tables 16-1 and 16-2.

[0262] The numbers 1, 2, and 3 indicated by "Number of DMRS CDM groups without data" in the table represent CDMRS groups {0}, {0, 1}, and {0, 1, 2}, respectively. DMRS ports correspond to the sequentially arranged indexes of the ports used. Antenna ports are represented as DMRS ports + 1000. DMRS CDM groups are associated with methods for generating DMRS sequences and antenna ports, as shown in Tables 17 and 18. Table 17 shows parameters when DMRS type = 1, and Table 18 shows parameters when DMRS type = 2.

[0263] [Table 17]

[0264]

[0265] [Table 18]

[0266]

[0267] The DMRS sequence according to the corresponding parameters is determined by Equation 2 below.

[0268] [Equation 2]

[0269]

[0270] Figure 9 is a diagram illustrating a radio protocol structure of a terminal and a base station in a single cell, carrier aggregation, and dual connectivity case according to an embodiment of the present disclosure.

[0271] Reference Figure 9The radio protocols of the next-generation mobile communication system may include NR Service Data Adaptation Protocol (SDAP) 925 and 970 in the terminal and NR base station, NR Packet Data Convergence Protocol (PDCP) 930 and 965, NR Radio Link Control (RLC) 935 and 960, and NR Medium Access Control (MAC) 940 and 955, respectively.

[0272] The main functions of NR SDAP 925 and 970 may include some of the following functions.

[0273] -User data transmission function (transmission of user plane data)

[0274] - Functionality for mapping uplink and downlink QoS flows and data bearers (mapping between QoS flows and DRBs for both DL and UL)

[0275] - Functionality to mark QoS flow ID in uplink and downlink (mark QoS flow ID in both DL and UL packets)

[0276] - Functionality for mapping Reflective QoS flows to data bearers of uplink SDAP PDUs (Mapping Reflective QoS flows to DRBs of UL SDAP PDUs)

[0277] For SDAP layer devices, the terminal can be configured via RRC messages to determine whether to use the header of the SDAP layer device or the function of the SDAP layer device for each PDCP layer device, for each bearer, or for each logical channel. When the SDAP header is configured, the base station can use the 1-bit NAS reflective QoS configuration indicator and the 1-bit AS reflective QoS configuration indicator of the SDAP header to instruct the terminal to update or reconfigure the mapping information for QoS flows and data bearers in the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority, scheduling information, etc. to support smooth services.

[0278] The main functions of NR SDAP 930 and 965 may include some of the following functions.

[0279] -Header compression and decompression function (header compression and decompression: ROHC only)

[0280] -User data transmission function (transmission of user data)

[0281] - Sequence delivery function (sequence delivery of upper layer PDU)

[0282] - Non-sequential delivery function (out-of-order delivery of upper layer PDUs)

[0283] - Reordering function (for reordering of received PDCP PDUs)

[0284] - Duplicate detection function (duplicate detection of lower layer SDUs)

[0285] -Retransmission function (retransmission of PDCP SDU)

[0286] -Encryption and decryption functions (encryption and decryption)

[0287] -Timer-based SDU discard function (timer-based SDU discard in uplink)

[0288] In the above, the reordering function of the NR PDCP device refers to a function of rearranging the order of PDCP PDUs received in a lower layer in an order based on a PDCP sequence number (SN), which may include a function of delivering data to a higher layer in a rearranged order, or a function of directly delivering data without considering the order, a function of rearranging the order and recording lost PDCP PDUs, a function of reporting the status of lost PDCP PDUs to the transmission side, and a function of requesting retransmission of lost PDCP PDUs.

[0289] The main functions of NR SDAP 935 and 960 may include some of the following functions.

[0290] -Data transmission function (transmission of upper layer PDU)

[0291] - Sequence delivery function (sequence delivery of upper layer PDU)

[0292] - Non-sequential delivery function (out-of-order delivery of upper layer PDUs)

[0293] -ARQ function (error correction through ARQ)

[0294] - Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU)

[0295] - Resegmentation function (resegmentation of RLC data PDU)

[0296] - Reordering function (reordering of RLC data PDUs)

[0297] -Duplicate detection function (duplicate detection)

[0298] -Error detection function (protocol error detection)

[0299] -RLC SDU discard function (RLC SDU discard)

[0300] -RLC re-establishment function (RLC re-establishment)

[0301] In the above, the sequential delivery function of the NR RLC device refers to a function of delivering the RLC SDU received from the lower layer to the higher layer in sequence, wherein the sequential delivery function may include the following functions: when one RLC SDU is initially divided into multiple RLC SDUs and then received, reordering the divided RLC SDUs and delivering the divided RLC SDUs, it may include a function of rearranging the received RLC PDU based on the RLC sequence number (SN) or the PDCP sequence number (SN), it may include a function of rearranging the order and recording the lost RLC PDU, it may include a function of reporting the status of the lost RLC PDU to the transmission side, it may include a function of requesting retransmission of the lost RLC PDU, and it may include the following function: when there is a lost RLC SDU, only the RLC SDU before the lost RLC SDU is delivered to the higher layer in sequence. Alternatively, the in-sequence delivery function may include a function of delivering all RLC SDUs received before the timer is started to a higher layer in sequence if a predetermined timer has expired despite the presence of lost RLC SDUs, or may include a function of delivering all RLC SDUs received until the current time to a higher layer in sequence if a predetermined timer has expired despite the presence of lost RLC SDUs. In the above, RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the order of sequence numbers or sequence numbers) and may be delivered to the PDCP device regardless of the order (out-of-sequence delivery). In the case where the received RLC PDU is segmented, the segments stored in the buffer or the segments received at a later time may be received, reconfigured into a complete RLC PDU, processed, and then delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer, or may be replaced by a multiplexing function of the NR MAC layer.

[0302] In the above, the out-of-order delivery function of the NR RLC device refers to a function of directly delivering the RLC SDU received from the lower layer to the higher layer regardless of the order, and may include the following functions: when one RLC SDU is initially divided into multiple RLC SDUs and then received, reordering the divided RLC SDUs and then delivering the divided RLC SDUs, and may include the following functions: storing the RLC SN or PDCP SN of the received RLC PDU and arranging it so as to record the lost RLC PDU.

[0303] NR MAC 940 and 955 can be connected to multiple NR RLC layer devices included in one terminal, and the main functions of NR MAC can include some of the following functions.

[0304] - Mapping function (mapping between logical channels and transport channels)

[0305] -Multiplexing and demultiplexing functions (MAC SDU multiplexing / demultiplexing)

[0306] -Scheduling information reporting function (Scheduling information reporting)

[0307] -HARQ function (error correction through HARQ)

[0308] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0309] - Function to adjust the priority between UEs (prioritization between UEs through dynamic scheduling)

[0310] -MBMS service identification function (MBMS service identification)

[0311] -Transmission format selection function (transmission format selection)

[0312] - Fill function (fill)

[0313] The NR PHY layers 945 and 950 may perform channel coding and modulation on higher-layer data so that the channel-coded and modulated higher-layer data becomes OFDM symbols and transmit the OFDM symbols via a radio channel, or may perform demodulation and channel decoding on OFDM symbols received through a radio channel so as to transmit them to a higher layer.

[0314] The detailed structure of the radio protocol structure may be changed differently depending on the carrier (or cell) operation method. For example, when the base station transmits data to the terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure having a single structure for each layer, as shown in 900. On the other hand, when the base station transmits data to the terminal based on carrier aggregation (CA) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure in which the RLC layer has a single structure but the PHY layer is multiplexed via the MAC layer, as shown in 910. As another example, when the base station transmits data to the terminal based on dual connectivity (DC) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure in which the RLC layer has a single structure but the PHY layer is multiplexed via the MAC layer, as shown in 920.

[0315] In LTE and NR, the terminal has a process of reporting the capabilities supported by the terminal to the corresponding base station while connected to the serving base station. This will be referred to as "UE capability (report)" in the following description. The base station can transmit a UE capability query message for requesting a capability report to the connected terminal. The message may include a request from the base station for the terminal capabilities for each RAT type. The request for each RAT type may include frequency band information for requesting UE capabilities. The UE capability query message can be used to request multiple RAT types in one RRC message container, or the base station can transmit a UE capability query message including a request for each RAT type to the terminal multiple times. That is, the UE capability query can be repeated multiple times, and the terminal can configure a UE capability information message corresponding to it and report the corresponding UE capability information message multiple times. In the next generation mobile communication system, requests for terminal capabilities can be performed for MR-DC as well as NR, LTE and EN-DC. For reference, the UE capability query message is usually sent in the initial stage after the terminal is connected, but the base station can request UE capabilities under any conditions as needed.

[0316] As described above, a terminal that has received a request for a UE capability report from a base station configures the UE capability according to the RAT type and frequency band information requested from the base station. Hereinafter, a method for configuring UE capability by a terminal in an NR system is described.

[0317] 1. If the terminal receives a list of LTE and / or NR frequency bands from the base station via UE capabilities, the terminal configures a frequency band combination (BC) for EN-DC and NR standalone (SA). That is, the terminal configures a candidate list of BCs for EN-DC and NR SA based on the frequency bands requested from the base station via FreqBandList. These frequency bands have priority in the order described in FreqBandList.

[0318] 2. If the base station requests UE capability reporting by setting the "eutra-nr-only" flag or the "eutra" flag, the terminal completely removes the NR SABC from the configured BCS candidate list. This can only happen when the LTE base station (eNB) requests "eutra" capability.

[0319] 3. The terminal then removes the fallback BC from the candidate list of BCs configured in the above operation. Here, the fallback BC corresponds to the case where the frequency band corresponding to at least one SCell is removed from a superset BC. Since the superset BC can cover the fallback BC, the fallback BC can be omitted. This operation also applies to Multi-RAT Dual Connectivity (MR-DC), i.e., LTE bands. The BCs remaining after this operation constitute the final "candidate BC list."

[0320] 4. The terminal selects the BC to be reported by selecting the BC that meets the requested RAT type from the final "candidate BC list". In this operation, the terminal configures the supported band combination list in a predetermined order. That is, the terminal configures the BC to be reported and the UE capabilities according to the pre-configured RAT type order (nr->eutra-nr->eutra). The terminal configures featureSetCombination for the configured supportedBandCombinationList, and configures a list of "candidate feature set combinations" from the candidate BC list of the deleted fallback BC list (including capabilities of equal or lower levels). The "candidate feature set combination" can include feature set combinations of both NR and UTRA-NR BCs, and can be obtained from the feature set combinations of UE-NR capabilities and UE-MRDC capability containers.

[0321] 5. If the requested RAT type is eutra-nr and affects, featureSetCombinations are included in both the UE-MRDC capabilities and UE-NR capabilities containers. However, feature sets for NR are only included in the UE-NR capabilities.

[0322] After configuring the UE capabilities, the terminal can transmit a UE capability information message including the UE capabilities to the base station. The base station performs appropriate scheduling and transmission / reception management for the corresponding terminal at a later time based on the UE capabilities received from the corresponding terminal.

[0323] In NR, a channel state information reference signal (CSI-RS) is supported as a reference signal for a terminal's channel state report, and each CSI-RS resource configuration configured by a higher layer may include at least the following detailed configuration information. However, the present disclosure is not limited to the following embodiments.

[0324] *NZP-CSI-RS-ResourceConfigID: ID of the corresponding CSI-RS resource configuration

[0325] *NrofPorts: The number of CSI-RS ports included in the corresponding CSI-RS resource

[0326] *CSI-RS-time configuration: the transmission period and time slot offset of the corresponding CSI-RS resource

[0327] *CSI-RS resource mapping: OFDM symbol position in the time slot and subcarrier position in the PRB of the corresponding CSI-RS resource

[0328] *CSI-RS-density: frequency density of corresponding CSI-RS

[0329] *CDM type: CDM length and CDM RE pattern of the corresponding CSI-RS

[0330] *CSI-RS-FreqBand: The transmission bandwidth and starting position of the corresponding CSI-RS

[0331] *Pc: Ratio between physical downlink shared channel (PDSCH) energy per RE (EPRE) and NZP CSI-RSePRE

[0332] *PC-SS: Ratio between SS / PBCH block EPRE and NZP CSI-RSePRE

[0333] *CSI-RS-ResourceRep: The NZP CSI-RS resources belonging to one resource set cooperate with each other. If CSI-RS-ResourceRep is in the "ON" state, the terminal can recognize that the same spatial transmission filter is applied to all NZP CSI-RS resources belonging to the resource set (that is, the terminal can assume that the base station has used the same transmission beam). In the following, the transmission beam may refer to a directional transmission signal, which can be used interchangeably with the application of the spatial transmission filter), and the corresponding NZP CSI-RS resources have the same number of CSI-RS ports and the same periodicity. If CSI-RS-ResourceRep is in the "OFF" state, the terminal may not assume that the same spatial transmission filter is applied to all NZP CSI-RS resources belonging to the resource set (that is, the terminal may not assume that the base station has used the same transmission beam), and may not assume that the corresponding NZP CSI-RS resources have the same number of CSI-RS ports and the same periodicity.

[0334] According to some embodiments, in NR, one CSI-RS resource can be configured with one of {1, 2, 4, 8, 12, 16, 24, and 32} as the number of CSI-RS ports, and different configuration freedoms can be supported according to the number of CSI-RS ports configured for the CSI-RS resource. Table 19 shows the CSI-RS density, CDM length and type, and the starting position on the frequency axis and time axis of the CSI-RS component RE pattern. As well as the number of frequency-axis REs (k') and the number of time-axis REs (l') of the CSI-RS component RE pattern, which can be configured according to the number of NR CSI-RS ports (X).

[0335] According to some embodiments, the CSI-RS component RE pattern is a basic unit for configuring CSI-RS resources and may include a total of YZ REs, including (Y=1+max(k′)) REs adjacent on the frequency axis and (Z=1+max(l′)) REs adjacent on the time axis. Referring to Table 19, the NR system supports different degrees of configuration freedom on the frequency axis according to the number of CSI-RS ports configured in the CSI-RS resource.

[0336] Figure 10 FIGURE 1 illustrates the designation of CSI-RS resource elements by CSI-RS resource mapping according to some embodiments. Figure 10 , Figure 10 1005 。 It is a diagram showing an example of CSI-RS RE specification by CSI-RS resource mapping configured by a higher layer. When the CSI-RS corresponds to 1 port, the CSI-RS can be configured in the PRB without being restricted by subcarriers, and the position of the CSI-RS RE can be allocated to the terminal through a 12-bit bitmap 1000. In the case of {2, 4, 8, 12, 16, 24 and 32} ports and Y=2, the CSI-RS can be configured in every two subcarriers in the PRB, and the position of the CSI-RS RE can be allocated to the terminal through a 6-bit bitmap 1005. In the case of 4 ports and Y=4, the CSI-RS can be configured in every 4 subcarriers in the PRB, and the position of the CSI-RS RE can be allocated to the terminal through a 3-bit bitmap 1010. Similarly, the terminal can be allocated the time axis position of the CSI-RS RE through a total of 14 bits of bitmap. In this case, the length of the bitmap may vary according to the Z value associated with Table 19 (CSI-RS position within the time slot) allocated as the frequency position, but the principle is similar to the above description, so its detailed description will be omitted.

[0337] [Table 19]

[0338]

[0339] For example, if X=2 ports are configured, the base station can allocate the frequency axis RE position according to 1005, and if the base station allocates the frequency axis subcarrier position by 2 of 1005 and allocates the time axis OFDM symbol position by 9 of 1015, the terminal can identify the CSI-RS to be sent at the RE position 1025 in the corresponding PRB 1020 based on the allocated position.

[0340] As described above, in NR, the base station can configure CSI-RS for the terminal to provide other functions in addition to CSI measurement, such as rate matching or time / frequency tracking. When configuring CSI-RS reporting settings for functions other than CSI-RS measurement, there may be a side effect of consuming terminal power for generating unnecessary CSI or wasting uplink resources for unnecessary CSI reporting.

[0341] The following describes in detail the method for measuring and reporting channel status in a 5G communication system.

[0342] Channel state information (CSI) may include a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (L1), a rank indicator (RI), a reference signal received power (L1-RSRP), and / or similar information. The base station may control the time and frequency resources used for the above CSI measurement and terminal reporting.

[0343] For the above-mentioned CSI measurement and reporting, the terminal can be configured via higher-layer signaling to have setting information for N (N≥1) CSI reports (CSI-ReportConfig), setting information for M (M≥1) RS transmission resources (CSI-ResourceConfig), and list information of one or two trigger states (CSI-AperiodicTriggerStateList, CSI-SemiPersistentOnPUSCH-TriggerStateList).

[0344] The configuration information for the above CSI measurement and reporting may be described in more detail in Tables 20 to 26 below.

[0345] [Table 20] CSI-ReportConfig

[0346] The IE CSI-ReportConfig is used to configure periodic or semi-persistent reporting sent on the PUCCH on the cell that includes the CSI-ReportConfig, or to configure semi-persistent or aperiodic reporting sent on the PUSCH triggered by DCI received on the cell that includes the CSI-ReportConfig (in this case, the cell sending the report is determined by the received DCI). See TS 38.214

[19] , clause 5.2.1.

[0347] CSI-ReportConfig Information Element

[0348]

[0349]

[0350]

[0351]

[0352] CSI-ReportConfig Field Description

[0353] -Carrier: Indicates in which serving cell the CSI-ResourceConfig indicated below is to be found. If this field is not present, the resources are on the same serving cell as this reporting configuration.

[0354] -codebookConfig: Codebook configuration for type 1 or type II, including codebook subset restrictions.

[0355] -cqi-FormatIndicator: Indicates whether the UE should report a single (wideband) CQI or multiple (subband) CQIs. (See TS 38.214

[19] , clause 5.2.1.4).

[0356] -cqi-Table: Which CQI table is used for CQI calculation (see TS 38.214

[19] , clause 5.2.2.1).

[0357] -csi-IM-ResourcesForInterference: CSI IM resources used for interference measurement. Included in the CSI-ResourceConfig in the configuration of the serving cell indicated by the "carrier" field above. The CSI-ResourceConfig indicated here contains only CSI-IM resources. The BWP-Id in the CSI-ResourceConfig has the same value as the bwp-Id in the CSI-ResourceConfig indicated by resourcesForChannelMeasurement.

[0358] -csi-ReportingBand: Indicates a contiguous or non-contiguous subset of subbands in the bandwidth part for which CSI should be reported. Each bit in the bit string represents a subband. The rightmost bit in the bit string represents the lowest subband in the BWP. The selection determines the number of subbands (subband 3 for 3 subbands, subband 4 for 4 subbands, etc.) (see TS 38.214

[19] , clause 5.2.1.4). If there are less than 24 PRBs (no subbands), this field is not present, otherwise it is present and the number of subbands can be from 3 (24 PRBs, subband size 8) to 18 (72 PRBs, subband size 4).

[0359] -dummy: This field is not used in this specification. If this field is received, the UE shall ignore it.

[0360] - groupBasedBeamReporting: reporting based on turning on / off group beams (see TS 38.214

[19] , clause 5.2.1.4)

[0361] - Non-PMI Port Indication: Port indication used for RI / CQI calculation. For each CSI-RS resource in the linked ResourceConfig used for channel measurement, the port indication for each level R indicates which R ports to use. Applicable only to non-PMI feedback (see TS 38.214

[19] , clause 5.2.1.4.2).

[0362] The first entry in non-PMI-PortIndication corresponds to the NZP-CSI-RS-Resource indicated by the first entry in nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the first entry in nzp-CSI-RS-ResourceSetList of CSI-ResourceConfig, and the CSI-ResourceConfigId of CSI-ResourceConfig is indicated together in CSI-MeasID and the above-mentioned CSI-ReportConfigId; the second entry in non-PMI-PortIndication corresponds to The NZP-CSI-RS-Resource indicated by the second entry in the nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the first entry in the nzp-CSI-RS-ResourceSetList of the same CSI-ResourceConfig, and so on, until the NZP-CSI-RS-Resource indicated by the last entry in the nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the first entry in the nzp-CSI-RS-ResourceSetList of the same CSI-ResourceConfig. Then, the next entry corresponds to the NZP-CSI-RS-Resource indicated by the first entry in the nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the second entry in the nzp-CSI-RS-ResourceSetList of the same CSI-ResourceConfig, and so on.

[0363] -nrofReportedRS: The number (N) of measured RS resources to be reported per reporting setting in non-group based reporting. N<=N_max, where N_max is 2 or 4 depending on UE capabilities.

[0364] (See TS 38.214

[19] , clause 5.2.1.4) When the field is not present, the UE shall apply the value 1

[0365] -nzp-CSI-RS-ResourcesForInterference: NZP CSI RS resources used for interference measurement. Included in the CSI-ResourceConfig in the configuration of the serving cell indicated by the "carrier" field above. The CSI-ResourceConfig indicated here contains only NZP-CSI-RS resources. The BWP-Id in the CSI-ResourceConfig has the same value as the bwp-Id in the CSI-ResourceConfig indicated by resourcesForChannelMeasurement.

[0366] -p0alpha: Index of the p0-alpha set that determines the power control used for this CSI report transmission (see TS 38.214

[19] , clause 6.2.1.2).

[0367] -pdsch-BundleSizeForCSI: PRB bundle size assumed for CQI calculation when reportQuantity is CRI / RI / i1 / CQI. If this field is not present, the UE assumes that PRB bundle is not applied (see TS 38.214

[19] , clause 5.2.1.4.2).

[0368] -pmi-FormatIndicator: Indicates whether the UE should report single (wideband) or multiple (subband) PMI. (See TS 38.214

[19] , clause 5.2.1.4).

[0369] -pucch-CSI-ResourceList: Indicates which PUCCH resources are used for reporting on the PUCCH.

[0370] -reportConfigType: Reports the time domain behavior of the configuration

[0371] -reportFreqConfiguration: Reports the configuration in the frequency domain. (See TS 38.214

[19] , clause 5.2.1.4).

[0372] -reportQuantity: CSI related quantity to be reported. Corresponds to the L1 parameter "ReportQuantity" (see TS 38.214

[19] , clause 5.2.1).

[0373] -reportSlotConfig: Periodicity and slot offset (see TS 38.214

[19] , clause 5.2.1.4).

[0374] -reportSlotConfig-v1530: Extended value range for reportSlotConfig for semi-persistent CSI on PUSCH. If this field is present, the UE shall ignore the value provided in the legacy field (semiPersistentOnPUSCH.reportSlotConfig).

[0375] -reportSlotOffsetList: Timing offset Y used for semi-persistent reporting using PUSCH. This field lists the allowed offset values. The list must have the same number of entries as the pusch-TimeDomainAllocation list in PUSCH-Config. The specific value is indicated in the DCI. The network indicates in the DCI field of the UL grant which configured reporting slot offset the UE should apply. DCI value 0 corresponds to the first reporting slot offset in the list, DCI value 1 corresponds to the second reporting slot offset in the list, and so on. The first report is sent in slot n+Y, the second report is sent in slot n+Y+P, where P is the configured period.

[0376] Timing offset Y for aperiodic reporting using PUSCH. This field lists the allowed offset values. The list must have the same number of entries as the pusch-TimeDomainAllocation list in PUSCH-Config. The specific value is indicated in the DCI. The network indicates in the DCI field of the UL grant which configured reporting slot offset the UE should apply. A DCI value of 0 corresponds to the first reporting slot offset in the list, a DCI value of 1 corresponds to the second reporting slot offset in the list, and so on (see TS 38.214

[19] , clause 5.2.3).

[0377] -resourcesForChannelMeasurement: Resources used for channel measurement. Included in the CSI-ResourceConfig in the serving cell configuration indicated by the "carrier" field. The CSI-ResourceConfig indicated here only contains NZP-CSI-RS resources and / or SSB resources. This CSI-ReportConfig is associated with the DL BWP indicated by the bwp-Id in this CSI-ResourceConfig.

[0378] -subbandSize: Indicates one of two possible BWP-related values ​​for the subband size, as indicated in Table 5.2.1.4-2 of TS 38.214

[19] . If csi-ReportingBand is not present, the UE shall ignore this field.

[0379] - Time restriction for channel measurements (timeRestrictionForChannelMeasurements): Time domain measurement restriction for channel (signal) measurements (see TS 38.214

[19] , clause 5.2.1.1)

[0380] - Time Restriction For Interference Measurements: Time domain measurement restriction for interference measurements (see TS 38.214

[19] , clause 5.2.1.1)

[0381] [Table 21] CSI-ResourceConfig

[0382] The IE CSI-ResourceConfig defines a group with one or more NZP-CSI-RS-ResourceSet, CSI-IM-ResourceSet and / or CSI-SSB-ResourceSet.

[0383] CSI-ResourceConfig information element

[0384]

[0385] CSI-ResourceConfig Field Description

[0386] -bwp-Id: The DL BWP where the CSI-RS associated with this CSI-ResourceConfig is located (see TS 38.214

[19] , clause 5.2.1.2

[0387] -csi-ResourceConfigId: Used in CSI-ReportConfig to reference an instance of CSI-ResourceConfig

[0388] -csi-RS-ResourceSetList: contains up to maxNrofNZP-CSI-RS-ResourceSetsPerConfig resource sets if ResourceConfigType is "aperiodic", otherwise 1 (see TS 38.214

[19] , clause 5.2.1.2)

[0389] -csi-SSB-ResourceSetList: SSB resource list for beam measurement and reporting in resource sets (see TS 38.214

[19] , FFS_Section)

[0390] - Resource Type (resourceType): Temporal behavior of resource configuration (see TS 38.214

[19] , clause 5.2.1.2). It does not apply to resources provided in csi-SSB-ResourceSetList.

[0391] Table 22: NZP-CSI-RS-ResourceSet

[0392] The IE NZP-CSI-RS-ResourceSet is a set of non-zero power (NZP) CSI-RS resources (their IDs) and parameters of a specific set.

[0393] NZP-CSI-RS-ResourceSet information element

[0394]

[0395] NZP-CSI-RS-ResourceSet Field Description

[0396] - AperiodicTriggeringOffset: The offset X between the time slot containing the DCI that triggers a set of aperiodic NZP CSI-RS resources and the time slot in which the CSI-RS resource set is transmitted. A value of 0 corresponds to 0 time slots, a value of 1 corresponds to 1 time slot, a value of 2 corresponds to 2 time slots, a value of 3 corresponds to 3 time slots, a value of 4 corresponds to 4 time slots, a value of 5 corresponds to 16 time slots, and a value of 6 corresponds to 24 time slots. When this field is not present, the UE applies a value of 0.

[0397] -nzp-CSI-RS-Resources: NZP-CSI-RS resources associated with this NZP-CSI-RS resource set (see TS 38.214

[19] , clause 5.2). For CSI, each resource set has a maximum of 8 NZP CSIRS resources.

[0398] -Repeat: Indicates whether repetition is on / off. If this field is set to "off" or if it is not present, the UE may not assume that the same downlink spatial transmission filter is used in each symbol and that the NZP-CSI-RS resources within the resource set are transmitted using the same NrofPorts (see TS 38.214

[19] , clauses 5.2.2.3.1 and 5.1.6.1.2). This can only be configured for CSI-RS resource sets associated with a CSI-ReportConfig with L1RSRP reporting or "no report".

[0399] -trs-Info: Indicates that the antenna ports of all NZP-CSI-RS resources in the CSI-RS resource set are the same. If this field does not exist or is released, the UE shall apply the value "false" (see TS 38.214

[19] , clause 5.2.2.3.1).

[0400] Table 23: CSI-SSB-ResourceSet

[0401] IE CSI-SSB-ResourceSet is used to configure an SS / PBCH block resource set, which refers to the SS / PBCH indicated in ServingCell ConfigCommon.

[0402] CSI-SSB-ResourceSet information element

[0403]

[0404] Table 24 CSI-IM-ResourceSet

[0405] The IE CSI-IM-ResourceSet is used to configure a set including one or more CSI interference management (IM) resources (their IDs) and parameters of a specific set.

[0406] CSI-IM resource set information element

[0407]

[0408] [Table 25]CSI-AperiodicTriggerStateList

[0409] The CSI-AperiodicTriggerStateList IE is used to configure a list of aperiodic trigger states for the UE. Each codepoint in the DCI field "CSI Request" is associated with a trigger state. Upon receiving a value associated with a trigger state, the UE will perform CSI-RS (reference signal) measurements and aperiodic reporting for L1 according to all entries in the reporting configuration information list associated with that trigger state.

[0410] CSI-AperiodTriggerStateList information element

[0411]

[0412] CSI-AssociatedReportConfigInfo Field Description

[0413] -csi-IM-ResourcesForInterference: CSI-IM-ResourceSet used for interference measurement. The entry number in the csi-IM-ResourceSetList in the CSI-ResourceConfig is indicated by the csi-IM-ResourcesForInterference in the CSI-ReportConfig, which is indicated by the reportConfigId above (1 for the first entry, 2 for the second entry, and so on). The indicated CSI-IM-ResourceSet should have exactly the same number of resources as the NZP-CSI-RS-Resources indicated in nzp-CSI-RS-ResourcesforChannel.

[0414] -csi-SSB-ResourceSet: CSI-SSB-ResourceSet for channel measurement. The entry number in the csi-SSB-ResourceSetList in the CSI-ResourceConfig is indicated by the csi-IM-ResourcesForInterference in the CSI-ReportConfig, and the CSI-ReportConfig is indicated by the reportConfigId above (1 corresponds to the first entry, 2 corresponds to the second entry, and so on).

[0415] -nzp-CSI-RS-ResourcesForInterference: NZP-CSI-RS resource set for interference measurement. The entry number in nzp-CSI-RS-ResourceSetList in CSI-ResourceConfig is indicated by nzp-CSI-RS-ResourcesForInterference in CSI-ReportConfig, and CSI-ReportConfig is indicated by reportConfigId above (1 corresponds to the first entry, 2 corresponds to the second entry, and so on).

[0416] -qcl-info: A list of references to TCI states that provides the QCL source and QCL type for each NZP-CSI-RS-Resource listed in the nzp-CSI-RS-Resources of the NZP-CSI-RS-ResourceSet indicated by nzp-CSI-RS-ResourcesforChannel. Each TCI-StateId refers to the TCI state (TCI-State) with the value of tci-StateId and is defined in tci-StatesToAddModList in the PDSCH-Config, which is included in the BWP-Downlink in the DL BWP corresponding to the serving cell and resourcesForChannelMeasurement (in the CSI-ReportConfig indicated by the above reportConfigId). The first entry in qcl-info-forChannel corresponds to the first entry in nzp-CSI-RS-Resources of NZP-CSI-RS-ResourceSet, the second entry in qcl-info-forChannel corresponds to the second entry in nzp-CSI-RS-ResourceSet, and so on (see TS 38.214

[19] , clause 5.2.1.5.1)

[0417] -reportConfigId: reportConfigId of one of the CSI-ReportConfigToAddMod configured in CSI-MeasConfig

[0418] -Resource Set (resourceSet): NZP-CSI-RS-ResourceSet used for channel measurement. The entry number in nzp-CSI-RS-ResourceSetList in CSI-ResourceConfig is indicated by resourcesForChannelMeasurement in CSI-ReportConfig, and CSI-ReportConfig is indicated by reportConfigId above (1 corresponds to the first entry, 2 corresponds to the second entry, and so on).

[0419]

[0420] [Table 26]CSI-SemiPersistentOnPUSCH-TriggerStateList

[0421] The CSI-SemiPersistentOnPUSCH-TriggerStateList IE is used to configure a trigger state list for the UE for semi-persistent reporting of channel state information on L1. Refer to TS 38.214

[19] , clause 5.2.

[0422] CSI-SemiPersistentOnPUSCH-TriggerStateList information element

[0423]

[0424] For the above CSI reporting settings (CSI-ReportConfig), each reporting setting of CSI-ReportConfig can be associated with a downlink (DL) bandwidth part identified by a higher-layer parameter bandwidth part identifier (bwp-id), and the higher-layer parameter bandwidth part identifier is given by the CSI resource setting of CSI-ResourceConfig associated with the corresponding reporting setting.

[0425] As a time domain reporting operation for each reporting setting of CSI-ReportConfig, "aperiodic", "semi-persistent" and "periodic" schemes may be supported, which may be configured for the terminal by the base station via parameters of the reportConfig type configured from a higher layer. The semi-persistent CSI reporting method may support the "semi-persistent on PUCCH" method and the "semi-persistent on PUSCH" method. In the periodic or semi-persistent CSI reporting method, the PUCCH or PUSCH resources in which the CSI will be transmitted may be configured for the terminal by the base station via higher layer signaling. The periodicity and time slot offset of the PUCCH or PUSCH resources in which the CSI will be transmitted may be given by the numerology of the uplink (UL) bandwidth portion configured to transmit the CSI report. In the aperiodic CSI reporting method, the base station may schedule the PUSCH resources in which the CSI will be transmitted for the terminal via L1 signaling (e.g., the above-mentioned DCI format 0_1).

[0426] Regarding the above-mentioned CSI resource settings (CSI-ResourceConfig), each CSI resource setting of CSI-ReportConfig may include S (S≥1) CSI resource sets (configured via higher layer parameters of CSI-RS-ResourceSetList). The CSI resource set list may include non-zero power (NZP) CSI-RS resource sets and SS / PBCH block sets or CSI interference measurement (CSI-IM) resource sets. Each CSI resource setting may be located in a downlink (DL) bandwidth part identified by a higher layer parameter of BWP-id and may be connected to a CSI report setting in the same downlink bandwidth part. The time domain operation of the CSI-RS resources in the CSI resource setting may be configured as one of "a-periodic", "periodic" or "semi-persistent" from the higher layer parameters of the resource type. For periodic or semi-persistent CSI resource settings, the number of CSI-RS resource sets may be limited to S=1, and the configured periodicity and slot offset may be given based on the numerology of the downlink bandwidth part identified by bwp-id. One or more CSI resource settings for channel or interference measurement may be configured by the base station for the terminal via higher layer signaling and may include the following CSI resources.

[0427] -CSI-IM resources for interference measurement

[0428] -NZP CSI-RS resources for interference measurement

[0429] -NZP CSI-RS resources for channel measurement

[0430] With respect to a CSI-RS resource set associated with a resource setting, where a higher-layer parameter of the resource type is configured as "aperiodic", "periodic", or "semi-persistent", the trigger state of the CSI report setting has a report type configured as "aperiodic", and the resource setting for channel or interference measurement on one or more component cells (CCs) can be configured via a higher-layer parameter of CSI-AperiodicTriggerStateList.

[0431] The terminal can use PUSCH to perform aperiodic CSI reporting, and can use PUCCH to perform periodic CSI reporting. When triggered or activated via DCI, PUSCH can be used to perform semi-persistent CSI reporting after activation via PUSCH and MAC control element (MAC CE). As described above, CSI resource settings can also be configured as aperiodic, periodic, and semi-persistent. A combination of CSI report settings and CSI resource settings can be supported based on the following Table 27.

[0432] [Table 27]

[0433]

[0434]

[0435] The aperiodic CSI report can be triggered by the "CSI request" field in the above-mentioned DCI format 0_1, which corresponds to scheduling DCI for PUSCH. The terminal can monitor PDCCH, obtain DCI format 0_1, and obtain scheduling information and CSI request indicator for PUSCH. The CSI request indicator can be configured with NTS (= 0, 1, 2, 3, 4, 5 or 6) bits and can be determined by higher layer signaling of reportTriggerSize. One of the one or more aperiodic CSI report trigger states that can be configured by higher layer signaling (CSI-AperiodicTriggerStateList) can be triggered by the CSI request indicator.

[0436] - If all bits in the CSI request field are 0, this may indicate that no CSI report is requested.

[0437] -If the number M of CSI triggering states configured in CSI-AperiodicTriggerStateLite is greater than 2NTs-1, the M CSI triggering states can be mapped to 2NTs-1 triggering states according to a predetermined mapping relationship, and one triggering state among the 2NTs-1 triggering states can be indicated by the CSI request field.

[0438] - If the number M of CSI triggering states configured in CSI-AperiodicTriggerStateLite is less than or equal to 2NTs-1, one of the M CSI triggering states may be indicated by the CSI request field.

[0439] Table 28 below shows an example of the relationship between a CSI request indicator and a CSI triggering state, which may be indicated by the corresponding indicator.

[0440] [Table 28]

[0441]

[0442]

[0443] The terminal can measure the CSI resources in the CSI triggering state triggered by the CSI request field, and then generate CSI (including at least one of the above-mentioned CQI, PMI, CRI, SSBRI, LI, RI or L1-RSRP). The terminal can send the acquired CSI by using the PUSCH scheduled based on the corresponding DCI format 0_1. If one bit of the uplink data indicator (UL-SCH indicator) corresponding to DCI format 0_1 ​​indicates "1", the terminal can multiplex the acquired CSI and uplink data (UL-SCH) to the PUSCH resources scheduled by DCI format 0_1 ​​to send the same CSI and uplink data. If one bit of the uplink data indicator (UL-SCH indicator) corresponding to DCI format 0_1 ​​indicates "0", the terminal can only map the CSI to the PUSCH resources without uplink data (UL-SCH) scheduled by DCI format 0_1 ​​to send the same resources.

[0444] Figure 11 is a diagram illustrating an example of an aperiodic CSI reporting method.

[0445] exist Figure 11In the example of , the terminal can obtain DCI format 0_1 ​​by monitoring PDCCH 1101, and can obtain scheduling information and CSI request information of PUSCH 1105 therefrom. The terminal can obtain resource information of CSI-RS1102 to be measured from the received CSI request indicator. The terminal can determine the time point at which the terminal needs to measure the resources of CSI-RS1102 based on the time point when DCI format 0_1 ​​is received and the offset parameter (e.g., aperiodicTriggeringOffset) in the CSI resource set configuration (e.g., NZP CSI-RS resource set configuration (NZP-CSI-RS-ResourceSet)). More specifically, the terminal can be configured via higher layer signaling to have an offset value X of the parameter of aperiodicTriggeringOffset in the NZP-CSI-RS resource set configuration from the base station, and the configured offset value X can refer to the offset between the time slot in which the DCI triggering the aperiodic CSI report is received and the time slot in which the CSI-RS resource is sent. For example, the parameter value of aperiodicTriggeringOffset and the offset value X may have a mapping relationship therebetween as shown in Table 29 below.

[0446] [Table 29]

[0447]

[0448]

[0449] Figure 11 The example of shows an example where the offset value X is configured as 0 (X=0). In this case, the terminal can receive the time slot of the DCI format 0_1 ​​that triggers the aperiodic CSI report (corresponding to Figure 11 The terminal receives CSI-RS 1102 in time slot 0 in the DCI format 0_1 ​​and can report CSI information measured based on the received CSI-RS to the base station via PUSCH 1105. The terminal can obtain scheduling information on PUSCH 1105 (information corresponding to each field of the above-mentioned DCI format 0_1) for CSI reporting from DCI format 0_1. For example, in DCI format 0_1, the terminal can obtain information about the time slot in which PUSCH 1105 is to be transmitted from the time domain resource allocation information of PUSCH 1105. Figure 11 In the example, the terminal obtains 3 as the K2 value corresponding to the time slot offset value from PDCCH to PUSCH, and therefore, PUSCH 1105 can be sent in time slot 3 1109, which is 3 time slots away from time slot 01106, that is, the time point when PDCCH 1101 has been received.

[0450] exist Figure 11 In another example, the terminal can obtain DCI format 0_1 ​​by monitoring PDCCH 1111, and can obtain scheduling information and CSI request information on PUSCH 1115 from DCI format 0_1. The terminal can obtain resource information of CSI-RS 1112 to be measured from the received CSI request indicator. Figure 11 In the example, the CSI-RS offset value X is configured as 1 (X=1). In this case, the terminal can receive the time slot of DCI format 0_1 ​​that triggers the aperiodic CSI report (corresponding to Figure 11 The CSI-RS 1112 is received in the time slot 0 1116) and the CSI information measured based on the received CSI-RS can be reported to the base station via the PUSCH 1115 of the time slot 3 1119.

[0451] Figure 12 : is a diagram showing examples of various operation scenarios of SRS. Figure 12 , the following at least three SRS operation scenarios can be considered in the NR system.

[0452] Base station 1205 configures a unidirectional beam for terminal 1200 (in this specification, configuring a unidirectional beam / precoding includes not applying a beam / precoding or applying a wide beam (cell coverage or sector coverage)). In the case of periodic SRS or semi-persistent SRS, terminal 1200 transmits the SRS according to the transmission period and the SRS offset. In the case of aperiodic SRS, terminal 1200 transmits the SRS in response to an SRS request from the base station (at a predetermined time after the SRS request). In this case, the SRS does not require additional information for beam / precoding.

[0453] 2) Base stations 1215 and 1220 configure beams for terminal 1210 in one or more directions, and terminal 1210 may transmit multiple SRS beams formed in one or more directions. Figure 12 As shown in the example of , SRS resource (or port) #0 can be configured to be beamformed to base station 1215, and SRS resource (or port) #1 can be configured to be beamformed to base station 1220. In this case, base stations 1215 and 1220 are required to notify not only the SRS request but also the SRS beam / precoding information (different from method 1).

[0454] 3) The base station 1230 configures a beam for the terminal 1225 in one or more directions, and the terminal 1225 can transmit multiple SRS beams formed in one or more directions. Figure 12As shown in the example of , the base station can configure the terminal to send SRS by applying different beams / precoding to SRS resource (or port) #0, SRS resource (or port) #1, and SRS resource (or port) #2. Therefore, even when the mobility of the terminal is higher, communication can be stably performed through beam / precoder diversity. For example, terminal 1225 can provide channel state information to base station 1230 via SRS#2 at time point A, and can provide channel state information to base station 1230 via SRS#0 at time point A+alpha. In this case, base station 1230 is required to notify not only the SRS request but also the SRS beam / precoding information, which is different from method 1).

[0455] The above description is provided based on SRS transmission, but can also be similarly extended to different UL channels or / and RS transmission, such as PRACH, PUSCH, PUCCH, etc., and detailed descriptions of all cases are omitted to prevent the subject matter of the present invention from being unclear.

[0456] Figure 13 This diagram shows the uplink transmission structure of a 5G or NR system.

[0457] Reference Figure 13 , the basic transmission unit of the 5G or NR system is a time slot 1300, each time slot includes 14 symbols 1305 based on the assumption of a normal cyclic prefix (CP) length, and 1 symbol can correspond to one UL waveform (CP-OFDM or DFT-S-OFDM) symbol.

[0458] A resource block (RB) 1310 is a resource allocation unit corresponding to one slot based on the time domain and may include 12 subcarriers based on the frequency domain.

[0459] The uplink structure can be mainly divided into a data region and a control region. Unlike the LTE system, the control region can be configured in a predetermined uplink position and transmitted in the 5G or NR system. The data region includes a series of communication resources, which include data sent to each terminal, such as voice and packets, and the communication resources correspond to the remaining resources in the subframe except the control region. The control region includes a series of communication resources for downlink channel quality reports from each terminal, reception ACK / NACK for downlink signals, uplink scheduling requests, etc.

[0460] The terminal can simultaneously transmit its own data and control information in the data region and the control region. The symbols in which the terminal can periodically transmit SRS within a time slot may be the last six symbols 1315, and may be transmitted via a preconfigured SRS transmission band within the UL BWP based on the frequency domain. However, this is merely an example, and the symbols capable of transmitting SRS may be extended to another time segment or transmitted across a frequency band. When RBs capable of transmitting SRS are transmitted in the frequency domain, the number of RBs may be a multiple of 4 RBs, and may be a maximum of 272 RBs.

[0461] In a 5G or NR system, N SRS symbols can be configured as 1, 2, or 4, and consecutive symbols can be sent. In a 5G or NR system, repeated transmission of SRS symbols is allowed. Specifically, the repetition transmission factor (repetition factor r) of the SRS symbol is r∈{1, 2, 4}, where r≤N. For example, when transmission is performed by mapping one SRS antenna to one symbol, up to 4 symbols can be repeatedly transmitted. Alternatively, four different antenna ports can be sent on four different symbols. In this case, each antenna port is mapped to one symbol, so repeated transmission of SRS symbols is not allowed.

[0462] In the case of LTE and NR, SRS may be configured based on the following higher layer signaling information (or a subset thereof).

[0463] BandwidthConfig: Configures SRS bandwidth information. The exact value indicated by each codepoint can vary depending on the uplink system BW value.

[0464] SubframeConfig (or ConfigIndex): Configures the SRS transmission period and transmission offset value. The exact value indicated by each code point may vary depending on whether the system is FDD or TDD.

[0465] ackNackSRS-SimultaneousTransmission: Indicates whether to perform concurrent transmission of ACK / NACK-SRS

[0466] MaxUpPts: Indicates whether the frequency position initialization of SRS transmission is performed in UpPTS.

[0467] Frequency Hopping: Indicates whether to perform SRS frequency hopping and the frequency hopping position and method using 2 bits of information.

[0468] Frequency domain position: indicates the frequency domain position of SRS transmission.

[0469] Duration: Indicates whether to perform periodic SRS transmission.

[0470] Transmit Comb: Indicates the comb offset value during SRS transmission.

[0471] Cyclic Shift: Indicates the cyclic shift value during SRS transmission.

[0472] Antenna Ports: Indicates the number of SRS antenna ports used during SRS transmission. LTE can support 1, 2, or 4 ports.

[0473] In LTE / LTE-A systems, periodic and aperiodic SRS transmissions can be supported based on the above information. In NR systems, additional information, such as activation / deactivation signaling for SRS resources, can be used instead of the above information, and periodic, semi-persistent, and aperiodic SRS transmissions can be supported. Depending on the SRS transmission type, for example, depending on whether the SRS transmission type is periodic, semi-persistent, or aperiodic SRS transmission, some configuration information can be omitted.

[0474] The SRS may include a constant amplitude zero autocorrelation (CAZAC) sequence. The CAZAC sequences used to configure the individual SRSs transmitted from multiple terminals have different cyclic shift values. Furthermore, the CAZAC sequences generated by cyclic shifting within a CAZAC sequence have the property of having zero correlation with sequences having cyclic shift values ​​different from the CAZAC sequence. Therefore, by utilizing these properties, SRSs simultaneously allocated to the same frequency domain can be divided according to the CAZAC sequence cyclic shift values ​​configured by the base station for each SRS.

[0475] The SRSs of multiple terminals can be divided according to the frequency position and the cyclic shift value. The frequency position can be divided by the SRS subband unit or by Comb. In 5G or NR systems, Comb2 and Comb4 can be supported. In the case of Comb2, only one SRS can be allocated to the even or odd subcarriers in the SRS subband. In this case, each of the even or odd subcarriers can constitute a Comb.

[0476] SRS subbands can be allocated to each terminal based on a tree structure. The terminal can perform frequency hopping on the SRS allocated to each subband at each SRS transmission time point. Therefore, all transmit antennas of the terminal can transmit SRS via the entire uplink data transmission bandwidth.

[0477] Figure 14 is a diagram showing a structure in which an SRS is allocated to each subband.

[0478] Reference Figure 14 , shows an example in which, when a data transmission band corresponds to 40 RBs in the frequency domain, an SRS is allocated to each terminal based on a tree structure configured by a base station.

[0479] exist Figure 14 , when the level index of the tree structure is b, the highest level (b=0) of the tree structure may include one SRS subband with a bandwidth of 40 RBs. At the second level (b=1), two SRS subbands may be generated from the SRS subband of the highest level (b=0), each SRS subband having a bandwidth of 20 RBs. Therefore, two SRS subbands may exist in the entire data transmission band of the second level (b=1). At the third level (b=2), five SRS subbands may be generated from one 20RB SRS subband of the immediately higher level (b=1), each subband having a bandwidth of 4 RBs, and ten SRS subbands may exist in one level, each subband having a bandwidth of 4 RBs.

[0480] The tree structure configuration may have various level numbers, SRS subband sizes, and SRS subband numbers per level depending on the configuration of the base station. The number of SRS subbands of level b generated from one SRS subband of a higher level may be defined as N b , and N b The index of the SRS subband can be defined as n b ={0, ..., N b -1}. As each level sub-band changes, it can be Figure 14 As shown, each level subband is assigned to a terminal. For example, terminal 114-00 can be assigned to the first SRS subband (n1=0) of two SRS subbands with a bandwidth of 20 RBs at level b=1, and terminal 214-01 and terminal 314-02 can be assigned to the first SRS subband (n2=0) and the third SRS subband (n2=2) under the second SRS subband with a bandwidth of 20 RBs, respectively. Based on these processes, the terminal can perform concurrent SRS transmission via multiple component carriers (CCs) and simultaneously perform SRS transmission via multiple SRS subbands in one CC.

[0481] Specifically, for the above SRS subband configuration, NR supports the SRS bandwidth configuration shown in Table 30 below.

[0482] [Table 30]

[0483]

[0484]

[0485] NR supports SRS frequency hopping based on the values ​​in Table 30 above, and the detailed process follows Table 31 below.

[0486] [Table 31]

[0487]

[0488]

[0489]

[0490] As mentioned above, 5G or NR terminals support single-user (SU)-MIMO schemes and have up to four transmit antennas. In addition, NR terminals can simultaneously transmit SRS through multiple CCs or multiple SRS subbands in a CC. Unlike LTE systems, in 5G or NR systems, various numbers can be supported, multiple SRS transmission symbols can be configured differently, and repeated SRS transmission via repetition factors can also be allowed.

[0491] Therefore, considering the above, it is necessary to count SRS transmissions. Statistical SRS transmissions can be used in various ways. For example, statistical SRS transmissions can be used to support antenna switching based on SRS transmissions. Specifically, the SRS transmission count can be used to determine the time point at which the SRS is transmitted, the antenna corresponding to the transmitted SRS, and the frequency band in which the SRS is transmitted.

[0492] Hereinafter, the rate matching operation and the puncturing operation are described in detail.

[0493] When time and frequency resource A, in which a predetermined symbol sequence A is to be transmitted, overlaps with predetermined time and frequency resource B, a rate matching or puncturing operation may be considered as a transmission / reception operation of channel A, taking into account a domain resource C in which resource A and resource B overlap with each other. Detailed operations may follow as follows.

[0494] The rate matching operation will be described below. The base station can transmit channel A by mapping channel A only to the resource region remaining after excluding the resource used to transmit symbol sequence A to the terminal from all resources A, where resource C corresponds to the region where resource A overlaps with resource B. For example, when symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}. The base station can sequentially map symbol sequence A to the remaining resources {resource #1, resource #2, resource #4} after excluding {resource #3} corresponding to resource C from resource A, in order to transmit the resources. As a result, the base station can respectively map the symbol sequence {symbol #1, symbol #2, symbol #3} to {resource #1, resource #2, resource #4}, in order to transmit the symbol sequence.

[0495] A terminal can determine resources A and B based on scheduling information for symbol sequence A from a base station, and can also determine resource C, which is an overlapping region of resource A and resource B, based on this scheduling information. The terminal can receive symbol sequence A based on the assumption that symbol sequence A has been mapped to and transmitted in the region remaining after excluding resource C from all of resource A. For example, when symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5), the terminal can receive symbol sequence A based on the assumption that symbol sequence A has been sequentially mapped to the remaining resources {resource #1, resource #2, resource #4} after excluding {resource #3} corresponding to resource C from resource A. As a result, the terminal can later perform a series of reception operations based on the assumption of the symbol sequence {symbol #1, resource #2, resource #4}. Symbol #2, symbol #3} are mapped to {resource #1, resource #2, resource #4} respectively and transmitted in {resource #1, resource #2, resource #4}.

[0496] Subsequently, the puncturing operation will be described. When there is a resource C corresponding to a region in which all resources A used to transmit a symbol sequence A to a terminal overlap with resources B, the base station may map the symbol sequence A to all resources A, but may perform transmission only in the resource region remaining after excluding resource C from resource A, without performing transmission in the resource region corresponding to resource C. For example, when a symbol sequence A includes {symbol #1}, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, and resource B is {resource #3, resource #5}, the base station may map the symbol sequence A of {symbol #1, symbol #2, symbol #3, symbol #4} to resource A {resource #1, resource #2, resource #3, resource #4, respectively}, and may transmit only the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the resources {resource #1, resource #2, resource #4} remaining after excluding {resource #3} corresponding to resource C from resource A, without transmitting {symbol #3} mapped to {resource #3} corresponding to resource C. The base station may map the symbol sequence {symbol #1, symbol #2, symbol #4} to {resource #1, resource #2, resource #4}, respectively, in order to transmit the symbol sequence.

[0497] A terminal can determine resources A and B based on scheduling information for symbol sequence A from a base station, and can also determine resource C based on this scheduling information, which is the region where resources A and B overlap. The terminal can receive symbol sequence A based on the assumption that symbol sequence A is mapped to all of resources A but is transmitted only in the region remaining after excluding resource C from resource A. For example, if symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}. And resource B is {resource #3, resource #5}. The terminal can assume that symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} is mapped to resources A {resource #1, resource #2, resource #3, resource #4}, respectively, but {symbol #3}, which is mapped to {resource #3} corresponding to resource C, is not transmitted. Reception can be performed based on the assumption that the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the resources {resource #1, resource #2, resource #4} remaining after excluding {resource #3} corresponding to resource C from resource A is mapped and transmitted. As a result, the terminal can later perform a series of reception operations based on the assumption that the symbol sequence {symbol #1, symbol #2, symbol #4} is mapped to {resource #1, resource #2, resource #4} and transmitted in {resource #1, resource #2, resource #4}, respectively.

[0498] Subsequently, rate matching resources will be described. Figure 15 This section describes a method for transmitting or receiving data by a base station and a terminal in consideration of downlink data channels and rate matching resources.

[0499] Figure 15 A downlink data channel (PDSCH) 1501 and rate matching resources 1502 are shown. The base station can configure one or more rate matching resources 1502 for the terminal via higher-layer signaling (e.g., RRC signaling). The configuration information for rate matching resources 1502 may include time axis resource allocation information 1503, frequency axis resource allocation information 1504, and periodicity information 1505. Hereinafter, the bitmap corresponding to frequency axis resource allocation information 1504 is referred to as the "first bitmap," the bitmap corresponding to time axis resource allocation information 1503 is referred to as the "second bitmap," and the bitmap corresponding to periodicity information 1505 is referred to as the "third bitmap." When all or some of the time and frequency resources of the scheduled data channel 1501 overlap with the configured rate matching resources 1502, the base station may partially match the data channel 1501 with the rate matching resources 1502 to transmit the data channel 1501, and the terminal may perform reception and decoding based on the assumption that the data channel 1501 is rate-matched in the portion of the rate matching resources 1502.

[0500] The base station can dynamically notify the terminal whether to perform rate matching on the data channel in the configured rate matching resource part via an additional configuration (corresponding to the "rate matching indicator" in the aforementioned DCI format). Specifically, the BS can select some of the configured rate matching resources, group the selected rate matching resources into rate matching resource groups, and notify the UE whether to perform rate matching on the data channel of each rate matching resource group by using a DCI using a bitmap scheme. For example, when four rate matching resources of RMR#1, RMR#2, RMR#3 and RMR#4 are configured, the base station can configure rate matching groups of RMG#1={RMR#1, RMR#2} and RMG#2={RMR#3, RMR#4}, and can indicate to the terminal whether to perform rate matching in each of RMG#1 and RMG#2 by using 2 bits within the DCI field. For example, when rate matching is required, the base station can configure each bit to "1", and when rate matching is not required, the base station can configure each bit to "0".

[0501] In the 5G system, the granularity of "RB symbol level" and "RE level" is supported as a method for configuring the above rate matching resources in the terminal. More specifically, the following configuration method can be used.

[0502] Hereinafter, a method of configuring the RB symbol level will be described. The terminal can configure up to four RateMatchPatterns for each bandwidth part through higher layer signaling, and one RateMatchPatterns can include the following contents.

[0503] As reserved resources within a bandwidth portion, resources in the time and frequency resource regions where the corresponding reserved resources are configured can be included by combining an RB-level bitmap and a symbol-level bitmap on the frequency axis. Reserved resources can span one or two time slots. A time domain pattern (periodicityAndPattern) can also be configured, in which the time and frequency domains, including a pair of corresponding bitmaps at the RB level and symbol level, are repeated.

[0504] - may include time domain and frequency domain resource regions configured as control resource sets within the bandwidth part and resource regions corresponding to the time domain pattern configured by the search space configuration, and the corresponding resource regions are repeated in the search space configuration.

[0505] Subsequently, a method of configuring the RE level will be described. The terminal may be configured with the following contents via higher layer signaling.

[0506] As the configuration information (LTE-CRS-ToMatchAround) of RE corresponding to the LTE specific cell reference signal or common reference signal (CRS) pattern, it may include the number of LTE CSR ports (nrofCRS-Ports), the value of LTE-CRS-Vshift (v-shift), the center subcarrier position of the LTE carrier from the reference frequency point (e.g., reference point A), information about the bandwidth size of the LTE carrier (CarrierBandwidthDL), subframe configuration information (mbsfn-SubframConfigList) corresponding to the multicast broadcast single frequency network (MBSFN), etc. The terminal can determine the CRS position within the NR time slot corresponding to the LTE subframe based on the above information.

[0507] - May include configuration information of resource sets corresponding to one or more zero-power (ZP) CSI-RS within the bandwidth part.

[0508] Figure 16 is a diagram illustrating an uplink-downlink configuration considered in a 5G communication system. In a 5G communication system, the uplink-downlink configuration of a symbol / time slot can have three stages. First, via specific cell configuration information 1610 based on system information, the uplink-downlink of the symbol / time slot can be semi-statically configured in units of symbols. Specifically, the uplink-downlink configuration information of a specific cell based on system information may include uplink-downlink mode information and subcarrier information as a reference. Via the uplink-downlink mode information, the mode period 1603, the number of consecutive downlink time slots from the starting point of each mode 1611, the number of symbols of subsequent time slots 1612, the number of consecutive uplink time slots from the end of the mode 1613, and the number of symbols of subsequent time slots 1614 can be indicated. In this case, the terminal can determine that the time slots and symbols that are not indicated as uplink and downlink are flexible time slots / symbols.

[0509] Secondly, based on specific user configuration information 1620 via dedicated higher layer signaling, time slots 1621 and 1622 including flexible time slots or flexible symbols can be indicated by numbers 1623 and 1625 of consecutive downlink symbols from the start symbol of each time slot and numbers 1624 and 1626 of consecutive uplink symbols from the end of the time slot, or all time slots can be indicated as downlink or uplink.

[0510] Finally, in order to dynamically change the downlink signal transmission part and the uplink signal transmission part, the UL / DL configuration can be indicated to the terminal group via DCI format 2_0 1330. The base station can indicate that each symbol indicated as a flexible symbol (i.e., not indicated as a downlink or uplink symbol) in each time slot is a downlink symbol, and whether the uplink symbol or the flexible symbol can be indicated via a time slot format indicator (SFI) 1631 or 1632 included in the downlink control channel. The time slot format indicator can be selected as an index in a table, where the uplink-downlink configuration of 14 symbols within one time slot is pre-configured, as shown in Table 32 below.

[0511] [Table 32]

[0512]

[0513] In the NR system, the tracking RS (ie, TRS) can be configured for fine time / frequency tracking of the base station. In the standard, TRS may be referred to as another term, such as CSI-RS for tracking, but for the convenience of description in the specification, TRS will be referred to as TRS. TRS can be sent in one (X=1) time slot or two (X=2) consecutive time slots with a specific period (e.g., 10ms or 20ms), and this is called a TRS burst.

[0514] Figure 17 The RE pattern of the TRS according to some embodiments is shown.

[0515] Reference Figure 17 , shows an example of TRS patterns available in a time slot. Figure 17 As shown, the TRS may have a frequency RE density of three RE / RB / ports, and the TRS RE may be repeated in every four subcarriers. (i.e., in Figure 17 One TRS port is sent in one of the REs 0, 1, 2, and 3 shown in the TRS OFDM symbol RE in the frequency range 1 (FR1). In addition, according to some embodiments, the TRS may be sent in one of three OFDM symbol pairs {5, 9}, {6, 10}, and {7, 11} in a frequency band below 6 GHz referred to as frequency range 1 (FR1), and may be sent in one of ten OFDM symbol pairs {1, 5}, {2, 6}, {3, 7}, {4, 8}, {5, 9}, {6, 10}, {7, 11}, {8, 12}, {9, 13}, and {10, 14} in a frequency band equal to or higher than 6 GHz referred to as frequency range 2 (FR2). It should be noted that Figure 17The position of the OFDM symbols in is an example of TRS configuration, and the actual transmission position may vary depending on the transmission of the base station.

[0516] Figure 18A is a diagram illustrating a 1-port CSI-RS configuration according to some embodiments.

[0517] refer to Figure 18A , shows the coverage for Figure 17 Example of I-port CSI-RS configuration for TRS RE pattern. Figure 20 , the base station can configure a resource set as a resource setting and can configure up to four CSI-RS resources 1800, 1810, 1820, and 1830 in the resource set. In this case, the frequency density of the CSI-RS can be configured as 3 REs / RBs / ports. If a TRS burst with X=1 is used, the base station can configure CSI-RS resources #0 and #1.

[0518] Figure 18B is a diagram showing another 1-port CSI-RS configuration according to some embodiments. If X=2TRS burst, the base station configures all CSI-RS resources #0, #1, #2 and #3 1800, 1810, 1820 and 1830. In the case of X=1 or X=2TRS burst, for the CSI-RS resources configured in one resource set, the terminal can assume the same antenna port with the same port index and perform continuous time / frequency tracking based on this. If the CSI-RS resource is configured as TRS, the base station can configure no corresponding report setting (CSI-ReportConfig) (that is, no report setting involving the corresponding CSI-RS resource), or the report setting configuration value can be set to "none", so that the terminal can be guaranteed to use the corresponding CSI-RS resource for time / frequency tracking and no CSI report is generated.

[0519] exist Figure 18A and Figure 18B In, you can Figure 17 The TRS subcarrier position of the I-port CSI-RS resource and the OFDM symbol position are appropriately changed.

[0520] TRS can be transmitted in various forms, such as periodic, semi-persistent, or aperiodic TRS. Periodic TRS (P-TRS) is transmitted periodically before RRC reconfiguration according to the periodicity and time slot offset value configured by RRC, semi-persistent TRS (SP-TRS) is transmitted based on the periodicity and time slot offset value configured by RRC after being activated by MAC CE or DCI and before being deactivated, and aperiodic TRS (A-TRS) is triggered by MAC CE or DCI and transmitted without any configuration of periodicity or time slot offset value. At this time, A-TRS triggering and A-TRS transmission timing may have an offset configured via a higher layer, or may follow a predetermined value (for example, transmitting A-TRS in the same time slot as the A-TRS triggering).

[0521] Since the number of REs on the time axis is insufficient, it is difficult to measure the statistical characteristics of the channel. The aperiodic TRS (A-TRS) can be associated with the periodic TRS or semi-persistent TRS. The association between the A-TRS and the SP-TRS or P-TRS can be supported by various methods, such as quasi-collocation (CQL). ​​For example, the base station can configure at least one SP-TRS or P-TRS as a QCL reference RS in the A-TRS to extract channel statistics such as delay spread, average delay, Doppler spread and Doppler shift (QCL type A), or extract spatial parameters such as TX beam or RX beam (QCL type D).

[0522] Bandwidth information is allocated to the TRS through a higher layer parameter of FreqBand, and if the bandwidth of the BWP in which the corresponding TRS is transmitted is narrower than 52 RBs, the bandwidth of the TRS is the same as the bandwidth of the BWP, and if the bandwidth of the BWP in which the corresponding TRS is transmitted is greater than or equal to 52 RBs, the bandwidth of the TRS is the same as the bandwidth of the BWP. The bandwidth of the TRS is configured as 52 RBs.

[0523] Figure 19 The structure of the signal processing device of the terminal according to an embodiment of the present invention is a diagram illustrating the structure of the signal processing device of the terminal. The structure of the signal processing device may include at least one of the antenna port, antenna panel and baseband processor of the terminal.

[0524] refer to Figure 19 , terminal 1900 may include multiple antenna ports or panels 1905 , 1910 , and 1915 . Figure 19The terminal is shown to have three antenna ports or panel structures, but this is only an example, and in actual applications, all terminals need not be limited to this, and more or fewer antenna ports or panel structures may be used. Multiple antenna ports or panels can be connected to an antenna port / panel selector (antenna selection module) 1920, or can be connected to a signal processor (baseband processing module) 1930 via an antenna port / panel gain combiner (antenna combining module / MIMO module) 1925, etc., depending on various environments and conditions, such as the manufacturing cost of the terminal, target performance, and an operating frequency band such as FR1 or FR2. For ease of description, modules such as the antenna port / panel selector (antenna selection module) 1920 and the antenna port / panel gain combiner (antenna combining module / MIMO module) 1925 are generally referred to as "antenna signal processors." The signal processor (baseband processing module) 1930 can receive RF signals or digital signals passing through the antenna signal processor, can measure reference signals according to the above-mentioned process, and can perform TCI / QCL processes or measure data symbols in order to demodulate data. Most existing terminals select and use antenna port / panel selector (antenna selection module) 1920 or antenna port / panel gain combiner (antenna combining module / MIMO module) 1925 for the purpose of reducing power consumption or reducing complexity / cost or extending wireless communication coverage or increasing capacity, respectively.

[0525] In order to appropriately obtain various gains according to the circumstances caused by antenna selection, connection and / or combination, future terminals may simultaneously implement multiple antenna signal processors or introduce complex antenna signal processors capable of performing various functions. Since the number of antenna ports / panels of a terminal gradually increases with the module size of the antenna ports / panels, and the minimum spacing required between each module shortens inversely with the frequency (proportional to the wavelength) as the frequency operating band (e.g., FR2 band higher than or equal to 6 GHz or FR4 band higher than or equal to 52.6 GHz) in wireless communication increases, this trend may gradually accelerate.

[0526] As mentioned above, when a terminal operating multiple antenna ports / panels has an antenna signal processor with multiple functions, it is theoretically possible to achieve high performance through excellent environmental adaptability. However, to achieve excellent adaptability and convert it into coverage gain or communication capacity gain, it is necessary to accompany it with separate reference signal transmission and measurement for each case, and the terminal's TCI and QCL measurement and application must also be processed separately for each case. This means that compared to traditional systems that adopt a single antenna signal processing method to achieve wireless communication performance gains through flexible antenna signal processing, it requires a large reference signal transmission and measurement burden, as well as additional costs, such as improved TCI and QCL measurement and application capabilities in the terminal.

[0527] The present disclosure provides a TCI simulation method that takes into account various antenna ports and panel structures of a terminal to reduce the reference signal transmission burden, thereby improving wireless communication efficiency. The main points of the present disclosure will be described below through specific embodiments.

[0528] <First embodiment>

[0529] The first embodiment provides a method for reducing the reference signal transmission burden through TCI and / or QCL (hereinafter referred to as TCI / QCL) simulation. According to this embodiment, TCI / QCL simulation is a combination of one or more of the following: 1) a method of appropriately combining two or more different TCI states or two or more different QCL hypotheses to determine a single TCI state or a single QCL hypothesis; 2) a method of appropriately dividing a single TCI state or a single QCL hypothesis to determine two or more different TCI states or two or more different QCL hypotheses. Various detailed methods are possible, and so on.

[0530] Figure 20 is a diagram illustrating an example of TCI simulation according to an embodiment of the present disclosure.

[0531] Figure 20 is a diagram showing a specific example of a method for generating one TCI state or one QCL hypothesis by appropriately combining two or more different TCI states or two or more different QCL hypotheses, which is a first method from two TCI simulation methods. Figure 20 , the terminal 2002 can establish an uplink or downlink wireless communication link with one or more transmission and reception points (TRPs), panels or antenna ports 2001 and 2011. In this case, considering various multi-TRP operation methods, such as single frequency network (SFN) and non-coherent joint transmission (NC-JT), some or all of the transmission points, panels and / or antenna ports can be transmitted (or included) in the same base station. For ease of description, the transmission points, panels and / or antenna ports will be collectively referred to as "transmission points". That is, in Figure 20 In this case, for ease of explanation, the physical locations of transmission points 2001 and 2011 are shown as different, but the present disclosure is not necessarily limited to this in actual application, and some transmission points may have the same physical location. (For example, a terminal may transmit or receive signals through two different transmission points, each having two panels. In this case, some of the four panels may share the same horizontal or vertical physical location.)

[0532] In this specification, generating a QCL hypothesis or starting or performing a QCL / TCI process may indicate that the terminal receives QCL configuration information from a base station, receives a channel or reference signal configured as a QCL reference RS in the configuration information, and generates all or some statistical information of the channel according to the QCL type of Table 10 so as to use it for channel estimation via reception of the QCL target RS configured in the corresponding QCL configuration information.

[0533] In this specification, different transmission points for transmitting a specific reference signal or channel may indicate that two different reference signals received by the terminal 2002 are configured via one or more higher layer signaling, activated via one or more higher layer signaling or L1 signaling, or instructed via L1 signaling to have different QCL assumptions or different TCI states. Similarly, different transmission points for receiving a specific reference signal or channel may indicate that two different reference signals transmitted by the terminal 2002 are configured via one or more higher layer signaling, activated via one or more higher layer signaling or L1 signaling, or instructed via L1 signaling to have different QCL assumptions (which may include UL QCL, DL-UL joint QCL, or spatial relationship information, etc.) or different UL-TCI states. In actual applications, to help the terminal easily determine that the transmission points are different, independent high-layer parameters can be defined and clearly stated. As described above, there may be differences in the terminology required to describe the downlink and uplink, but in order to avoid obscuring the main points of the description, the following description will mainly refer to the downlink. However, it should be noted that the general content of this disclosure can also be applied to the uplink in a similar manner.

[0534] As an example of a method for the base station to inform the terminal that the transmission points used to transmit a specific reference signal or channel are different (i.e., a method of configuring two different reference signals via one or more higher layer signaling, activating via one or more higher layer signaling or L1 signaling, or indicating via L1 signaling so as to have different QCL assumptions or different TCI states, etc.), the base station may configure an additional indicator, such as a CORESET pool index, for each CORESET configuration, and may agree to assume that RS (DMRS, CSI-RS, SRS, etc.), data channels (PDSCH, PUSCH, etc.), or control channels (PDCCH and PUCCH) are allocated or associated with DCI transmitted in the CORESET with the same value of the additional indicator and are transmitted from the same transmission point. For example, the terminal may assume that the PDCCH transmitted in the CORESET in which the CORESET pool index is not configured, or the PDCCH transmitted in the CORESET in which the CORSET pool index value is configured as 0, and the PDSCH allocated by the DCI included in the PDCCH are transmitted from the first transmission point, and the PDCCH transmitted in the CORESET in which the CORSET pool index value is configured as 1 and the PDSCH allocated by the DCI included in the corresponding PDCCH are transmitted from the second transmission point.

[0535] The example of classifying transmission points focuses on indicators that conform to CORESET, but this is for ease of description and the present disclosure is not limited thereto in actual application. In addition, the present disclosure can be similarly expanded by introducing additional indicators in various configurations such as PUCCH, PUCCH group, cell, cell group, BWP, and BWP group.

[0536] The terminal can use this method to determine various situations, such as whether the QCL reference RS and the target RS are associated with the same transmission point, the number of target RSs associated with one QCL reference RS, the number of QCL reference RSs associated with one target RS, etc.

[0537] In order not to obscure the main points of the present disclosure in the following description, it should be noted that there are situations in which the situations in which the QCL or TCI state is configured are collectively referred to as "the base station configures a specific QCL or TCI state for the terminal via higher layer signaling", "the specific QCL or TCI state is activated via higher layer signaling or L1 signaling", or "the specific QCL or TCI state is indicated by L1 signaling".

[0538] In the following description, two transmission points are assumed, but this is for convenience of description, and a case where three or more transmission points exist may also be supported in a similar manner.

[0539] refer to Figure 20, the terminal 2002 may receive and be configured with a QCL reference RS (e.g., SS / PBCH block, TRS, CSI-RS for BM (CSI-RS, where the repetition parameter is configured to be on or off in the SCI-RS)) 2003 from the first transmission point 2001 at a specific time point or in a specific time / frequency resource 2000, and may generate a QCL hypothesis or start a TCI process. Furthermore, the terminal 2002 may receive and be configured with a QCL reference RS (e.g., SS / PBCH block, TRS, CSI-RS for BM (CSI-RS, where the repetition parameter is configured to be on or off in the SCI-RS)) 2013 from the second transmission point 2011 at a specific time point or in a specific time / frequency resource 2010, and may generate a QCL hypothesis or start a TCI process.

[0540] When the terminal 2002 receives and is configured with QCL target RSs (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS, etc.) 2024 and 2025 transmitted from another specific time point or specific time / frequency resource 2020 from the first and second transmission points 2001 and 2011, the QCL reference RS should be transmitted in the same manner as the above-mentioned QCL target RS to obtain optimal reception performance. That is, for the best reception performance of the QCL target RSs 2024 and 2025, it is also necessary to simultaneously receive the QCL reference RSs from the first and second transmission points 2001 and 2011. However, for each transmission scenario at the first and second transmission points, this requires the transmission of a QCL reference RS different from the QCL reference RSs 2002 and 2013, and therefore requires an additional large amount (in some cases, an additional 50% or more) of reference signal transmission burden. In addition, in many cases, there is a problem that concurrent transmission of QCL reference RSs used in a public cell or public group is required.

[0541] To solve this problem, TCI simulation can be performed according to one or a combination of the following methods (QCL synthesis or TCI synthesis, and TCI simulation mode #1). Figure 20 As shown in Figure 1, in order to apply the QCL information measured in two different reference RSs to one target RS, the base station should be able to correctly inform the terminal of the many-to-one relationship (N:1 association) between the reference RS and the target RS. Based on this, in many cases, the base station and the terminal can appropriately exchange QCL and / or TCI information of the collaboratively transmitted QCL target RS without performing concurrent transmission or reception of the QCL reference RS used in a common cell or common group manner.

[0542] The current NR system supports multi-TRP transmission by using higher layer signaling (such as MAC CE), thereby supporting the function of connecting (activating) multiple TCI states to one TCI field code point in DCI. However, this function is to apply different TCI states to the corresponding DMRS CDM group by dividing the DMRS port indicated by the corresponding DMRS port indication field of DCI based on the DMRS CDM group (that is, in the conventional case, only one independent QCL assumption is applied to one DMRS port), and should be distinguished from the spirit and function of the present disclosure, which is intended to support by integrating (integrating the application of multiple QCL reference RSs) different TCI states or different QCL assumptions in one DMRS port (that is, one QCL target RS port).

[0543] According to the purpose of the present disclosure, one of the following three methods is applicable to integrate different TCI states or different QCL hypotheses (integrate multiple QCL reference RSs) and apply to one QCL target RS port.

[0544] Method 1: The first method is to connect multiple TCI states or QCL assumptions to be applied simultaneously with the DMRS ports indicated by DCI based on the Rel-16 PDSCH DMRS TCI activation MAC CE or its extension. In this case, a separate higher layer parameter is defined, and thus the terminal can determine based on the higher layer parameter whether the connection is interpreted according to the Rel-16 multi-TRP operation (i.e., the first TCI state is applied to the DMRS belonging to the first DMRS CDM group, and the second TCI state is applied to the DMRS belonging to the second DMRS CDM group) or whether to perform TCI emulation according to the following disclosure (i.e., a new TCI state is derived by integrating the first TCI state and the second TCI state, and applied to all indicated DMRS ports). The separate higher layer parameter can be defined as an independent RRC parameter, or the higher layer parameter for Rel-16 multi-TRP can be used to indicate the above content. According to method 1, the TCI state and QCL configuration in Table 11 are reusable, and thus TCI emulation can be supported with minimal standard changes, but there is a disadvantage that Rel-16 multi-TRP and TCI emulation operations cannot be performed simultaneously.

[0545] Method 2: The second method is a method that allows a total of four QCL types to be configured in one TCI state by modifying the TCI state configuration of Table 11 shown in Table 33 below. Based on this, the QCL target RS involving the corresponding TCI state can involve two different QCL reference RSs transmitted from two different transmission points. In this case, the QCL parameters indicated by qcl-type1 are synthesized with the QCL parameters indicated by qcl-type1-r17 to generate new first QCL information, and the QCL parameters indicated by qcl-type2 are synthesized with the QCL parameters indicated by qcl-type1-r17 to generate new second QCL information. Table 33 relates to an example in which two QCL reference RSs are referenced, but it can be extended in the same way with respect to three or more QCL reference RSs. In the case of method 2, an independent higher-layer signaling parameter is also defined, and this parameter can indicate whether to use the new parameters of the following qcl-type1-r17 and qcl-type2-r17, and can indicate the parameter pair to be used directly from {qcl-type1, qcl-type2} and {qcl-type1-r17.qcl-type2-r17}, or whether to use a new parameter pair generated by synthesizing the two parameter pairs.

[0546] [Table 33]

[0547]

[0548]

[0549] Method 3: The third method is a method of allowing a total of two QCL reference RSs to be included in one QCL configuration by modifying the QCL configuration of Table 11 shown in Table 34 below. Based on this, during channel estimation based on the QCL target RS, the terminal can refer to the channel parameters of two different QCL reference RSs sent from two different transmission points with reference to the corresponding TCI state. In this case, the terminal can directly integrate the measurement values ​​of the QCL reference RSs in the corresponding QCL configuration, or integrate the QCL parameter values ​​independently measured in the QCL reference RSs in the corresponding QCL configuration to generate new QCL information. Table 34 relates to an example in which two QCL reference RSs are referenced, but can be extended in the same manner with respect to three or more QCL reference RSs. Method 3 also allows notification of whether newly defined independent higher layer signaling parameters notify whether to use the following new parameters of reference signal-r17 and qcl-type-r17. In this case, QCL-type-r17 can additionally indicate a new type different from the existing QCL types A, B, C, and D. For example, type E can be added, and in addition to one of the existing QCL types, new channel statistics such as average gain can be supported for TCI simulation. A detailed method for TCI simulation based on channel statistics (such as average gain) is provided in detail below.

[0550] [Table 34]

[0551]

[0552]

[0553] Tables 33 and 34 are examples for providing a connection relationship (association) between one target RS and a plurality of reference RSs, and in actual applications, various applications are possible, and details such as the number of reference RSs may also be appropriately changed.

[0554] According to one of the aforementioned methods, the terminal may receive association information between the QCL target RS port and multiple TCI states or different QCL hypotheses from the base station, and may accordingly perform one of the following TCI / QCL integration methods.

[0555] Method 1: A first method of generating a new QCL parameter value (combined QCL hypothesis) by integrating QCL parameter values ​​(individual QCL hypotheses) measured or extracted from multiple QCL reference RSs is a method of using a weighted sum of individual QCL hypotheses as a combined QCL hypothesis. There may be integers with the same value as an example of coefficients multiplied by the individual QCL hypotheses in the weighted sum. The terminal is able to generate a combined QCL hypothesis by assuming the individual QCL hypotheses as independent random variables and multiplying all the same values ​​by the same integer value (for example, 1). According to this example, when the target RS is connected to a first reference RS having an average delay value = A, and at the same time is connected to a second reference RS having an average delay value = B, the combined average delay value is assumed to be A+B.

[0556] As another example, in order to integrate the secondary statistical characteristic values ​​of the control channel in continuously increasing directions (such as delay spread or Doppler spread), a comprehensive QCL hypothesis can be generated by performing multiplication and addition using real numbers of the same value (for example, 1 / N if there are N separate QCL hypotheses). According to this example, when the target RS is connected to a first reference RS having an average delay value of A, and at the same time is connected to a second reference RS having an average delay value of B, the comprehensive average delay value is assumed to be (A+B) / 2.

[0557] According to the method, the method of the example can be commonly applied to all QCL parameters configured by the base station, such as average delay, delay spread, Doppler shift, Doppler spread, and spatial RX parameters. However, as an application based on the method, it is also acceptable to apply different methods according to the QCL parameter type in the QCL hypothesis. For example, it is acceptable to determine the variable corresponding to the primary characteristic of the channel (based on the average or instantaneous value of a given measurement interval) by summing the variables (e.g., average delay, Doppler shift, or spatial RX parameters) using integer weights (e.g., 1) with the same value as the coefficient according to the first example and the variance value based on the secondary characteristic of the channel (based on the variance value of a given measurement interval). Delay spread or Doppler spread can be determined by summing real numbers (e.g., 1 / N) using the same value as the coefficient according to the second example, or an independent higher layer signaling parameter for configuring the same can be introduced. The higher layer signaling parameter can indicate the coefficient (or one of the methods of the example) to be applied to each QCL parameter, or can indicate that one of the methods of the example is applied to a preconfigured set of one or more specific QCL parameters.

[0558] Method 2: A second method for generating a new QCL parameter value (combined QCL hypothesis) by integrating QCL parameter values ​​(individual QCL hypotheses) measured or extracted from multiple QCL reference RSs is a method of using a QCL weighted sum as a combined QCL hypothesis by using an independent value other than the QCL configuration of the individual QCL hypothesis as a coefficient. As an example of multiplying the coefficient by the individual QCL hypotheses in the weighted sum, there may be an average gain. By applying the degree of contribution of each QCL hypothesis to the combined QCL hypothesis in proportion to the received strength of the reference RS used to estimate the corresponding individual QCL hypothesis, the terminal is able to use the average gain of each reference RS as an independent value. According to this example, when the target RS is connected to a first reference RS having an average delay value = A and an average gain = C, and at the same time is connected to a second reference RS having an average delay value = B and an average gain = D, the combined average delay value is assumed to be (C*A+D*B).

[0559] As another example, in order to control the integration of secondary statistical characteristic values ​​of the channel in continuously increasing directions (such as delay spread or Doppler spread), a comprehensive QCL hypothesis can be generated by performing multiplication and addition using the relative magnitudes of the average gains between reference RSs. According to this example, when the target RS is connected to a first reference RS having an average delay value of A and an average gain of C, while simultaneously connected to a second reference RS having an average delay value of B and an average gain value of D, the comprehensive average delay value is assumed to be (C*A+D*B) / (C+D).

[0560] According to this method, a method can be commonly applied to all QCL parameters configured by the base station, such as average delay, delay spread, Doppler shift, Doppler spread, and spatial RX parameters. However, as an application based on this method, it is also acceptable to apply different methods according to the type of QCL parameter in the QCL hypothesis. For example, it is permitted to determine the variables corresponding to the primary characteristics of the channel (based on the average or instantaneous value of a given measurement interval) (e.g., average delay, Doppler shift, or spatial RX parameters) and the variables corresponding to the secondary characteristics of the channel (based on the variance value of a given measurement interval) based on the sum of weights using integers (e.g., 1) with the same values ​​as the coefficients according to the first example of Method 1. According to the second example of Method 2, using the relative magnitude of the average gain between reference RSs as a coefficient, a weight such as delay spread or Doppler spread is determined based on the sum of weights, or an independent higher-layer signaling parameter for configuring the weight is introduced. The higher-layer signaling parameter can directly indicate the method used to synthesize a specific QCL parameter, or can indicate that one of the examples is applied to a preconfigured set of one or more specific QCL parameters.

[0561] Method 3: A third method for generating a new QCL parameter value (combined QCL hypothesis) by combining QCL parameter values ​​measured or extracted from multiple QCL reference RSs (individual QCL hypotheses) is a method of comparing the QCL parameter values ​​of the individual QCL hypotheses and selecting a dominant value therefrom to use the selected value as the combined QCL hypothesis. For example, in secondary statistical characteristic values ​​of a channel (such as delay spread or Doppler spread), the combined parameter value is greatly affected by the larger value among the individual values, and therefore the present invention may be limited so that, in consideration of the implementation complexity of the terminal, the combination is performed by selecting the maximum value from the individual QCL parameter measurement values ​​or only the top N values ​​from the individual QCL parameter measurement values ​​without generating an accurate combined value. According to this example, when the target RS is connected to a first reference RS having an average delay value = A, and at the same time is connected to a second reference RS having an average delay value = B, and the condition A>B is satisfied, the combined average delay value is assumed to be A.

[0562] As another example of generating a comprehensive QCL hypothesis by selecting a dominant value, there is a method of determining it according to a direct instruction of the base station. For example, in addition to Table 33 or Table 34, the base station is able to indicate information about the RS to the terminal via higher layer signaling or L1 signaling, in which RS, the QCL parameters to be used for the comprehensive QCL hypothesis are measured from multiple reference RSs. As another example of generating a comprehensive QCL hypothesis by selecting a dominant value, there is a method of determining the reference RS according to an independent parameter value, in which the QCL parameters for synthesis are measured. For example, it can be agreed that the independent parameter is the average gain measured in each reference RS. According to this example, when the target RS is connected to a first reference RS having an average delay value = A and an average gain = C, and is simultaneously connected to a second reference RS having an average delay value = B and an average gain = D, and C>D is satisfied, it is assumed that the comprehensive average delay value is A.

[0563] According to this method, a common method can be applied to all QCL parameters configured by the base station, such as average delay, delay spread, Doppler shift, Doppler spread, and spatial RX parameters. However, as an application based on this method, it is also acceptable to apply different methods in the QCL assumption according to the type of QCL parameter. For example, it is permitted to use a value selected based on the average gain value for variables corresponding to the primary characteristics of the channel (based on the average or instantaneous value of a given measurement interval), such as average delay, Doppler shift, or spatial RX parameters, according to the second example of Method 3, and to use a QCL assumption synthesized based on the magnitude of the QCL parameter values ​​of each reference RS according to the first example of Method 3 for variables corresponding to secondary characteristics of the channel (based on the variance value of a given measurement interval). Or, an independent higher-layer signaling parameter for configuring the QCL is introduced according to the first example of Method 3. The higher-layer signaling parameter can directly indicate the method used to synthesize a specific QCL parameter, or can indicate that one of the examples is applied to a preconfigured set of one or more specific QCL parameters.

[0564] Method 4: In the description of methods 1, 2 and 3, although some methods and combinations between the embodiments have been mentioned, it is obvious that the present disclosure is not necessarily limited to the embodiments in actual applications, and various combinations similar thereto can be considered.

[0565] Figure 21 is a diagram illustrating another example of TCI simulation according to an embodiment of the present invention.

[0566] Figure 21 1 is a diagram illustrating a specific example of the second method of the two TCI simulation methods, which is a method of performing two or more different TCI states or two or more different QCL hypotheses by appropriately dividing one TCI state or one QCL hypothesis. Figure 21 , the terminal 2103 can establish an uplink or downlink wireless communication link with one or more transmission and reception points (TRPs), panels or antenna ports 2101 and 2102. In this case, considering various multi-TRP operation methods, such as single frequency network (SFN) and non-coherent joint transmission (NC-JT), some or all of the transmission points, panels and / or antenna ports can be transmitted (or included) in the same base station. For ease of description, the transmission points, panels and / or antenna ports will be collectively referred to as "transmission points". That is, in Figure 21In this case, for ease of explanation, the physical locations of transmission points 2101 and 2102 are shown as different, but the present disclosure is not necessarily limited to this in actual application, and some transmission points may have the same physical location. (For example, a terminal may transmit or receive signals through two different transmission points, each having two panels. In this case, some of the four panels may share the same horizontal or vertical physical location.)

[0567] In this specification, generating a QCL hypothesis or starting or performing a QCL / TCI process may indicate that the terminal receives QCL configuration information from a base station, receives a channel or reference signal configured as a QCL reference RS in the configuration information, and generates all or some statistical information of the channel according to the QCL type of Table 10 so as to use it for channel estimation via reception of the QCL target RS configured in the corresponding QCL configuration information.

[0568] In this specification, different transmission points for transmitting a specific reference signal or channel may indicate that two different reference signals received by the terminal 2103 are configured via one or more higher layer signaling, activated via one or more higher layer signaling or L1 signaling, or indicated via L1 signaling to have different QCL assumptions or different TCI states. Similarly, different transmission points for receiving a specific reference signal or channel may indicate that two different reference signals transmitted by the terminal 2103 are configured via one or more higher layer signaling, activated via one or more higher layer signaling or L1 signaling, or indicated via L1 signaling to have different QCL assumptions (which may include UL QCL, DL-UL joint QCL, or spatial relationship information, etc.) or different UL-TCI states. In actual applications, in order to help the terminal easily determine that the transmission points are different, independent high-layer parameters can be defined and clearly stated. As described above, there may be differences in the terminology required to describe the downlink and uplink, but in order not to obscure the main points of the description, the following description will mainly refer to the downlink. However, it should be noted that the general content of the present disclosure can also be applied to the uplink in a similar manner.

[0569] In order not to obscure the main points of the present disclosure in the following description, it should be noted that there are situations in which the situations in which the QCL or TCI state is configured are collectively referred to as "the base station configures a specific QCL or TCI state for the terminal via higher layer signaling", "the specific QCL or TCI state is activated via higher layer signaling or L1 signaling", or "the specific QCL or TCI state is indicated by L1 signaling".

[0570] In the following description, two transmission points are assumed, but this is for convenience of description, and a case where three or more transmission points exist may also be supported in a similar manner.

[0571] refer to Figure 21 , the terminal 2103 may receive and be configured with QCL reference RSs (e.g., SS / PBCH blocks, TRS, CSI-RS for BM (CSI-RS, where a repetition parameter is configured to be turned on or off in the CSI-RS)) 2104 and 2105, which are simultaneously transmitted from a first transmission point 2101 and a second transmission point 2102 at a specific time point or a specific time / frequency resource 2100, and may generate a QCL hypothesis or start a TCI process. In this case, the terminal may consider three cases of target RS reception conditions, such as Figure 21 As shown. The first case is a case where the terminal 2103 receives and is configured with QCL target RSs (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS, etc.) 2114 and 2115, wherein the QCL target RSs are transmitted from the first and second transmission points 2101 and 2102 from a specific time point or a specific time / frequency resource 2110, wherein the terminal can receive the target RS by applying, in fact, measuring the QCL hypothesis from the QCL reference RS in the resource 2100. The second case is a case where the terminal 2103 receives a QCL target RS (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS) 2121 and is configured with a QCL target RS (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS) 2121 transmitted from the first transmission point 2101 from a specific time point or a specific time / frequency resource 2120, wherein the terminal needs to change and apply the QCL hypothesis measured from the QCL reference RS in the resource 2100 to obtain optimal reception performance. A third scenario similar to the second scenario is a scenario in which the terminal 2103 receives and is configured with a QCL target RS (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS, etc.) 2131 transmitted from a second transmission point 2102 at a specific time point or a specific time / frequency resource 2130, wherein the terminal needs to change and apply the QCL assumption measured from the QCL reference RS in the resource 2100 to obtain optimal reception performance.

[0572] However, for concurrent transmission at the first and second transmission points, this requires the transmission of a QCL reference RS different from the QCL reference RSs 2104 and 2105, thus requiring a significant additional reference signal transmission burden (in some cases, an additional 50% or more). Furthermore, in many cases, there is the problem of requiring concurrent transmission of QCL reference RSs used in a common cell or common group manner.

[0573] To solve this problem, TCI simulation (QCL segmentation or TCI segmentation, TCI simulation mode #2) can be performed according to one or a combination of the following methods. Figure 21 As shown in Figure 1, in order to divide and apply the QCL information measured in one reference RS to multiple target RSs, the base station should be able to correctly inform the terminal of the many-to-one relationship (1:N association) between the reference RS and the target RS. Based on this, in many cases, the base station and the terminal can appropriately exchange the QCL / TCI information of the collaboratively transmitted QCL target RSs without performing concurrent transmission or reception of the QCL reference RSs used in a common cell or common group manner.

[0574] The terminal is able to measure two or more pairs of QCL parameter values ​​(e.g., average delay, delay spread, Doppler shift, Doppler spread, spatial RX parameters, average gain, etc.) in one QCL reference RS at one time (simultaneously) according to the instruction of the base station. For example, as a result of the measurement, two values ​​can be measured as average delay values ​​(average delay 1, average delay 2), and two or more values ​​can also be measured. In this case, in order to reduce the complexity of the QCL parameter measurement of the terminal, the base station can notify the terminal of specific information related thereto (e.g., the number of parameter pairs to be measured simultaneously, the number of transmission points to be simultaneously sent signals, etc.). The specific information can be transmitted to the terminal based on higher layer signaling (e.g., RRC or MAC CE) or based on L1 signaling. According to Figure 21 For example, a QCL reference RS includes RS2104 transmitted from a first transmission point 2101 in resource 2100 and RS2105 transmitted from a second transmission point 2102, wherein the terminal can perform measurement using two pairs of QCL parameter values ​​(a specific QCL parameter value based on RS2104 and a specific QCL parameter value based on RS2105).

[0575] As another example, the terminal can determine whether to implicitly perform TCI emulation (QCL segmentation or TCI segmentation, TCI emulation mode #2) based on specific conditions different from explicit signaling. As an example, the terminal can be configured to determine whether to perform TCI emulation based on whether one or a combination of various conditions, such as the terminal rate, the TRS transmission period, and the maximum or minimum value of the measured Doppler shift, exceeds a predetermined threshold.

[0576] The base station can instruct the terminal to selectively apply one of the following operations when performing TCI emulation.

[0577] Simulation Mode # Operation # 1: When receiving a target RS, the terminal applies all pairs of QCL parameters measured simultaneously in one QCL reference RS. This is an operation assuming that the target RS is transmitted from multiple transmission points (such as reference RSs) at the same time. This indicates that when the terminal is instructed to perform an operation, the terminal generates a QCL hypothesis by assuming that one QCL parameter value exists in one QCL parameter, rather than assuming that multiple QCL parameter values ​​measured simultaneously exist in one QCL parameter, or the terminal starts or performs a QCL / TCI process. Reference Figure 21 , when the target RS is the same as RS2114 and RS2115 of resource 2110 , the terminal may use a QCL parameter value measured from QCL reference RS2104 and 2105 .

[0578] Simulation mode # Operation # 2: When receiving the target RS, the terminal applies the first set of QCL parameter pairs measured simultaneously. This is an operation assuming a case where the target RS is transmitted only from some of the transmission points (only the first transmission point) from which the reference RS is transmitted. Figure 21 , if the target RS is the target RS 2121 transmitted from the transmission point 2101, the terminal may generate a QCL hypothesis by applying QCL parameters measured based on RS 2104, or may start or perform a QCL / TCI process.

[0579] Simulation mode # Operation # 3: When receiving the target RS, the terminal applies the second set of QCL parameter pairs measured simultaneously. This is an operation assuming a case where the target RS is transmitted only from some transmission points (only at the second transmission point) from which the reference RS is transmitted. Figure 21 , if the target RS is the target RS 2131 transmitted from the transmission point 2102, the terminal may generate a QCL hypothesis by applying QCL parameters measured based on RS 2105, or may start or perform a QCL / TCI process.

[0580] <Second embodiment>

[0581] The second embodiment provides a method for reducing the reference signal transmission burden through TCI / QCL simulation. According to this embodiment, TCI / QCL simulation corresponds to one or more combinations of the following: 1) a method of dividing the measurement time intervals (monitoring opportunities) of target RSs with the same configuration into multiple groups according to multiple time intervals defined on the time axis and applying different QCL assumptions to the corresponding groups; 2) a method of allowing different TCI indications or TCI configurations for the corresponding groups by dividing time resources into multiple groups, and so on. Various detailed methods may exist.

[0582] Figure 22is a diagram illustrating an example of TCI simulation via measurement limitation according to an embodiment of the present disclosure.

[0583] refer to Figure 22 , the terminal 2203 can establish an uplink or downlink wireless communication link with two or more transmission points, panels or antenna ports 2201 and 2202. In this case, considering various multi-TRP operation methods, such as single frequency network (SFN) and non-coherent joint transmission (NC-JT), some or all of the transmission points, panels and / or antenna ports can be sent (or included) in the same base station. For ease of description, the transmission points, panels and / or antenna ports will be collectively referred to as "transmission points". That is, in Figure 22 In this case, for ease of explanation, the physical locations of transmission points 2201 and 2202 are shown as different, but the present disclosure is not necessarily limited to this in actual application, and some transmission points may have the same physical location. (For example, a terminal may transmit or receive signals through two different transmission points, each having two panels. In this case, some of the four panels may share the same horizontal or vertical physical location.)

[0584] In this specification, generating a QCL hypothesis or starting or performing a QCL / TCI process may indicate that the terminal receives QCL configuration information from a base station, receives a channel or reference signal configured as a QCL reference RS in the configuration information, and generates all or some statistical information of the channel according to the QCL type of Table 10 so as to use it for channel estimation via reception of the QCL target RS configured in the corresponding QCL configuration information.

[0585] In this specification, different transmission points for transmitting a specific reference signal or channel may indicate that two different reference signals received by the terminal 2203 are configured via one or more higher layer signaling, activated via one or more higher layer signaling or L1 signaling, or indicated via L1 signaling to have different QCL assumptions or different TCI states. Similarly, different transmission points for receiving a specific reference signal or channel may indicate that two different reference signals transmitted by the terminal 2203 are configured via one or more higher layer signaling, activated via one or more higher layer signaling or L1 signaling, or indicated via L1 signaling to have different QCL assumptions (which may include UL QCL, DL-UL joint QCL, or spatial relationship information, etc.) or different UL-TCI states. In actual applications, in order to help the terminal easily determine that the transmission points are different, independent high-layer parameters can be defined and clearly stated. As described above, there may be differences in the terminology required to describe the downlink and uplink, but in order not to obscure the main points of the description, the following description will mainly refer to the downlink. However, it should be noted that the general content of the present disclosure can also be applied to the uplink in a similar manner.

[0586] In order not to obscure the main points of the present disclosure in the following description, it should be noted that there are situations in which the situations in which the QCL or TCI state is configured are collectively referred to as "the base station configures a specific QCL or TCI state for the terminal via higher layer signaling", "the specific QCL or TCI state is activated via higher layer signaling or L1 signaling" or "the specific QCL or TCI state is indicated by L1 signaling".

[0587] In the following description, two transmission points are assumed, but this is for convenience of description, and a case where three or more transmission points exist may also be supported in a similar manner.

[0588] refer to Figure 22 , the base station can configure or instruct terminal 2203 to measure reference signals in time-frequency resources. In this case, the time resources used to measure reference signals may include information indicating periodicity and offset in units of time slots or subframes, as well as information about the position of OFDM symbols in which the reference signals are transmitted within a time slot. If the terminal needs to use various QCL hypotheses (e.g., 1) terminal 2203 receives reference RS 2204 transmitted from first transmission point 2201 to generate QCL hypothesis 2200, 2) terminal 2203 receives reference RS 2211 transmitted from second transmission point 2202 to generate QCL hypothesis 2210, 3) terminal 2203 simultaneously receives reference RS 2221 and 2222 transmitted from first and second transmission points 2201 and 2202 to generate QCL hypothesis 2220, etc.), the base station can divide the time resources used for reference signal measurement defined by the aforementioned one reference signal configuration and instruct the terminal to generate different QCL hypotheses for each time interval. For ease of description, this is referred to as a "QCL hypothesis method based on time-domain measurement restrictions."

[0589] For “time resources for reference signal measurement defined by one reference signal configuration”, various applications are possible, for example, time resources refer to time resources according to periodicity and offset configured in a periodic or semi-persistent CSI-RS resource configuration (or information indicating a plurality of time resources is included in one periodic or semi-persistent CSI-RS resource, and the time resources indicated by each piece of information may also correspond to each time interval). Time resources according to the transmission timing and transmission offset of the triggered DCI of the aperiodic CSI-RS (or the transmission offset may be configured in one aperiodic CSI-RS resource, and the time resources according to each offset may also correspond to each time interval), time resources defined for each OFDM symbol or each time slot in a subframe or frame, regardless of the reference signal configuration, and so on. In Figure 22In the present invention, for ease of description, it has been assumed that “time resources for reference signal measurement defined by one reference signal setting” are divided into a total of six intervals 2230, 2231, 2232, 2233, 2234, and 2235. The intervals may be divided according to a predetermined rule, such as “every N-th resource within the time resources for reference signal measurement,” or may be divided according to explicit signaling, such as a bitmap or resource index.

[0590] exist Figure 22 In this case, for the three QCL hypothesis calculation methods 2200, 2210, and 2220, it is assumed that cells of two of the six intervals are mapped to (associated with) each QCL hypothesis calculation method. For example, when generating a QCL hypothesis based on one reference signal configuration, the terminal 2203 may divide the reference measurement interval based on the one reference signal configuration into three subgroups according to an instruction from the base station, may generate a first QCL hypothesis 2200 in the first subgroup 2230 and 2233, may generate a second QCL hypothesis 2210 in the second subgroup 2231 and 2234, and may generate a third QCL hypothesis 2220 in the third subgroup 2232 and 2235. In this case, the terminal may not recognize clear information about the number of transmission points based on which the QCL hypothesis is generated for each subgroup, but rather, when the terminal implements processing of reference signal reception results (e.g., averaging for noise cancellation, etc.), it may be restricted from mixing and using reference signal reception results belonging to different subgroups.

[0591] Figure 23 is a diagram illustrating an example of TCI simulation via a resource pool according to an embodiment of the present disclosure.

[0592] Reference Figure 23, the terminal can divide the portion in which the reference signal for generating the QCL hypothesis can be measured into several intervals (e.g., 2300, 2305, 2310, 2315, 2320, and 2325) from all time / frequency resources (e.g., time / frequency resources included in the downlink (D) time slot, which are neither configured nor indicated as flexible (F) or uplink (U)). This can be determined based on higher layer signaling that configures the time resources, and this can be called a resource pool for the QCL hypothesis. The base station can be configured to implement the execution of the TCI process (e.g., performing the TCI process for TCI#1 in resource pools 2300, 2310, and 2320) or the generation of the QCL hypothesis by assuming a traditional one-to-one reference RS target RS relationship in some resource pools but assuming a traditional one-to-one reference RS target RS relationship in other resource pools (e.g., 2305), but in resource pools (e.g., 2305, 2315, and 2325), the base station can be configured to implement the execution of the TCI process or the generation of the QCL hypothesis by assuming a many-to-one-to-many reference RS target RS relationship proposed in the present disclosure. The resource pool configuration information can be sent via higher layer signaling. The resource pool can be configured by explicit parameters, such as information indicating periodicity and offset, a bitmap, and one or more resource indexes, or the resource pool can be implicitly configured.

[0593] In this case, it can be understood that the terminal is instructed to perform TCI emulation in resource pools 2305, 2315, and 2325. Figure 22 In the example of , the process can be performed by the terminal in the following manner: identifying that the QCL assumptions between the resource pools 2300, 2310, and 2320 used to perform measurements of a conventional QCL or TCI framework (or including some or all of the TCI processes thereafter) and the resource pools 2305, 2315, and 2325 used to perform TCI simulation (or including some or all of the TCI processes thereafter) are different from each other. That is, in this case, the terminal is able to determine that the measurement results between resource pools 2300, 2310, and 2320 have the same statistical characteristics and joint processing is possible, but in the case of other resource pools 2305, 2315, and 2325, the terminal can recognize that the measurement results have different statistical characteristics, and thus joint processing between the resource pools cannot be performed. Alternatively, as in the example of resource pools 305, 2315, and 2325, the base station can indicate to the terminal using the QCL assumption or TCI status via direct higher layer signaling or / and L1 signaling, and the QCL assumption or TCI status needs to be integrated in each resource pool. In this case, the higher layer signaling and / or L1 signaling may include the above-mentioned higher layer signaling parameters or downlink control information fields.

[0594] <Third embodiment>

[0595] The third embodiment provides an operation sequence of a base station and a terminal according to the present disclosure.

[0596] Figure 24 is a diagram illustrating an operation sequence of a base station and a terminal according to an embodiment of the present disclosure.

[0597] Reference Figure 24 In operation 2400, the terminal may perform a terminal capability report, which informs the base station whether it supports part or all of the above-mentioned TCI emulation methods. The base station receives the terminal capability report. Thereafter, in operation 2405, the base station may perform TCI configuration or QCL configuration for a part of the TCI emulation method supported by the terminal via higher layer signaling based on the terminal capability report, and if necessary, may perform activation of a part thereof via MAC CE or L1 signaling. The terminal receives the higher layer signaling and receives the activation information via MAC CE or L1 signaling when sent by the base station. Then, in operation 2410, the terminal may determine whether to perform TCI emulation and the TCI emulation operation method (or mode) based on the information and some of the above-mentioned TCI emulation operation conditions.

[0598] If the terminal is configured not to perform TCI emulation, or if the TCI emulation performance conditions are not met, then in operation 2415, the terminal performs the TCI / QCL procedure by assuming a 1:1 relationship between the target RS and the reference RS (i.e., performs NR Rel-15 or Rel-16 operation). On the other hand, if the terminal is configured to perform TCI emulation and meets the performance conditions of TCI emulation mode #1 of embodiment 1, then in operation 2420, the terminal performs the TCI / QCL procedure by assuming a 1:N relationship between the target RS and the reference RS according to the method. Alternatively, if the terminal is configured to perform TCI emulation and meets the performance conditions of TCI emulation mode #2 of embodiment 1, then in operation 2425, the terminal performs the TCI / QCL procedure by assuming an N:1 relationship between the target RS and the reference RS according to the method. Alternatively, if the terminal is configured to perform TCI emulation and meets the performance conditions of TCI emulation mode #3 or #4 of embodiment 2, then in operation 2430, the terminal performs the TCI / QCL procedure by assuming QCL parameter measurement or measurement restrictions of the resource pool according to the method.

[0599] The above embodiments and methods are not exclusive and can be combined with each other depending on the situation. For example, a terminal can be configured to use TCI emulation mode #1 or #2 of the first embodiment in FR1, and to apply TCI emulation mode #3 or #4 of the second embodiment in FR2. Various other applications are possible, but not all possible numbers are listed to avoid obscuring the main points of the present disclosure.

[0600] Figure 25is a block diagram of a terminal according to an embodiment of the present invention.

[0601] Reference Figure 25 , the terminal 2500 may include a transceiver 2510, a controller 2520, and a memory 2530. The transceiver 2510, the controller 2520, and the memory 2530 of the terminal 2500 may operate according to a method for effectively transmitting or receiving channels and signals in a 5G communication system, which corresponds to the aforementioned embodiment. However, the elements of the terminal 2500 according to the embodiment are not limited to the above examples. According to another embodiment, the terminal 2500 may include more or fewer elements than the aforementioned elements. In addition, in certain cases, the transceiver 2510, the controller 2520, and the memory 2530 may be implemented in the form of a single chip.

[0602] The transceiver 2510 may include a transmitter and a receiver according to another embodiment. The transceiver 2510 may transmit or receive signals to or from a base station. These signals may include control information and data. To this end, the transceiver 2510 may include an RF transmitter configured to up-convert and amplify the frequency of the transmitted signal; an RF receiver configured to perform low-noise amplification and frequency down-conversion of the received signal, etc. Furthermore, the transceiver 2510 may receive signals via a radio channel, output these signals to the controller 2520, and transmit signals output from the controller 2520 via the radio channel.

[0603] The controller 2520 can control a series of processes that the terminal 2500 can operate according to the above-described embodiments of the present disclosure. For example, the controller 2520 can execute at least one of the TCI simulation execution methods according to the embodiments of the present disclosure. The storage unit 2530 can store control information or data, such as TCI or QCL configuration information included in the signal acquired by the terminal 2500, and can have an area for storing data required for control by the controller 2520, data generated during control by the controller 2520, and the like.

[0604] Figure 26 is a block diagram of a base station according to an embodiment.

[0605] refer to Figure 26Base station 2600 may include a transceiver 2610, a controller 2620, and a memory 2630. The transceiver 2610, controller 2620, and memory 2630 of base station 2600 may operate according to a method for efficiently transmitting or receiving channels and signals in a 5G communication system, corresponding to the aforementioned embodiment. However, the elements of base station 2600 according to the embodiment are not limited to the above example. According to another embodiment, base station 2600 may include more or fewer elements than those described above. Furthermore, in certain cases, transceiver 2610, controller 2620, and memory 2630 may be implemented as a single chip. Transceiver 2610 may include a transmitter and a receiver according to another embodiment. Transceiver 2610 may transmit or receive signals to or from a terminal. These signals may include control information and data. To this end, transceiver 2610 may include an RF transmitter configured to up-convert and amplify the frequency of a transmitted signal; and an RF receiver configured to perform low-noise amplification and frequency down-conversion of a received signal. In addition, the transceiver 2610 may receive a signal through a radio channel, may output the signal to the controller 2620 , and may transmit a signal output from the controller 2620 through a radio channel.

[0606] The controller 2620 may control a series of processes so that the base station 2600 may operate according to the above-described embodiments of the present disclosure. For example, the controller 2620 may execute at least one of the TCI simulation methods according to the embodiments of the present disclosure.

[0607] The storage unit 2630 can store control information and data, such as TCI or QCL configuration information determined by the base station 2600, or control information and data received from the terminal, and can have an area for storing data required for control by the controller 2620 and data generated during control by the controller 2620.

[0608] The embodiments of the present disclosure described and illustrated in the specification and drawings are merely specific examples, which have been presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, those skilled in the art will understand that other variations based on the technical ideas of the present disclosure can be implemented. In addition, the above-mentioned various embodiments can be used in combination as needed.

Claims

1. A method performed by a terminal of a wireless communication system, the method comprising: receiving, via higher layer signaling, configurations related to a plurality of transmission configuration indication (TCI) states from a base station; receiving, via higher layer signaling, information related to TCI simulation from the base station, the information related to TCI simulation indicating that a quasi-colocation assumption of downlink data is based on two TCI states; receiving downlink control information DCI for scheduling the downlink data from the base station, the DCI including TCI information indicating the two TCI states and DMRS configuration information indicating one or more demodulation reference signal DMRS ports; as well as receiving downlink data using the DMRS of the one or more DMRS ports, Wherein, when the first type of TCI emulation is configured, the DMRS of the one or more DMRS ports is assumed to be quasi-colocated with reference signals associated with two TCI states for a quasi-colocation parameter set.

2. The method according to claim 1, wherein The quasi-co-located parameter set includes Doppler frequency shift, Doppler spread, average delay and delay spread.

3. The method according to claim 1, wherein When the second type of TCI emulation is configured, for a specific quasi-colocation parameter in the quasi-colocation parameter set, the DMRSs of the one or more DMRS ports are assumed to be quasi-colocated with a reference signal associated with a TCI state.

4. The method according to claim 3, wherein: The specific quasi-co-located parameters correspond to Doppler frequency shift and Doppler spread.

5. The method according to claim 1, further comprising: A medium access control (MAC) control element (CE) is received from the base station, wherein the MAC CE activates the two TCI states for the TCI information in the DCI.

6. The method according to claim 1, further comprising: Send capability information indicating whether the TCI simulation is supported to the base station.

7. A method performed by a base station of a wireless communication system, the method comprising: Sending configurations related to multiple transmission configuration indication (TCI) states to the terminal through higher layer signaling; Sending, via higher layer signaling, information related to TCI simulation to the terminal, where the information related to TCI simulation indicates that a quasi-colocation assumption of downlink data is based on two TCI states among the multiple TCI states; Sending downlink control information DCI for scheduling the downlink data to the terminal, where the DCI includes TCI information indicating the two TCI states and DMRS configuration information indicating one or more demodulation reference signal DMRS ports; as well as sending the downlink data using the DMRS of the one or more DMRS ports, Wherein, when the first type of TCI emulation is configured, the DMRS of the one or more DMRS ports is assumed to be quasi-colocated with reference signals associated with two TCI states for a quasi-colocation parameter set.

8. The method according to claim 7, wherein: The quasi-co-located parameter set includes Doppler frequency shift, Doppler spread, average delay and delay spread.

9. The method according to claim 7, wherein: When the second type of TCI emulation is configured, for a specific quasi-colocation parameter in the quasi-colocation parameter set, the DMRSs of the one or more DMRS ports are assumed to be quasi-colocated with a reference signal associated with a TCI state.

10. The method according to claim 9, wherein: The specific quasi-co-located parameters correspond to Doppler frequency shift and Doppler spread.

11. The method according to claim 7, further comprising: A medium access control (MAC) control element (CE) is sent to the terminal, where the MAC CE activates the two TCI states for the TCI information in the DCI.

12. The method according to claim 7, further comprising: Capability information indicating whether the TCI emulation is supported is received from the terminal.

13. A terminal comprising: at least one transceiver; at least one processor communicatively coupled to the at least one transceiver; as well as At least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor, alone or in any combination, to cause the terminal to: receiving, via higher layer signaling, configurations related to a plurality of transmission configuration indication (TCI) states from a base station; receiving, via higher layer signaling, information related to TCI simulation from the base station, the information related to TCI simulation indicating that a quasi-colocation assumption of downlink data is based on two TCI states; receiving downlink control information DCI for scheduling the downlink data from the base station, the DCI including TCI information indicating the two TCI states and DMRS configuration information indicating one or more demodulation reference signal DMRS ports; as well as receiving downlink data using the DMRS of the one or more DMRS ports, Wherein, when the first type of TCI emulation is configured, the DMRS of the one or more DMRS ports is assumed to be quasi-colocated with reference signals associated with two TCI states for a quasi-colocation parameter set. The terminal according to claim 13 , wherein: The quasi-co-located parameter set includes Doppler frequency shift, Doppler spread, average delay and delay spread. The terminal according to claim 13 , wherein: When the second type of TCI emulation is configured, for a specific quasi-colocation parameter in the quasi-colocation parameter set, the DMRSs of the one or more DMRS ports are assumed to be quasi-colocated with a reference signal associated with a TCI state. The terminal according to claim 15 , wherein: The specific quasi-co-located parameters correspond to Doppler frequency shift and Doppler spread. The terminal according to claim 13 , wherein: The instructions further cause the terminal to receive a medium access control (MAC) control element (CE) from the base station, the MAC CE activating the two TCI states for the TCI information in the DCI. The terminal according to claim 13 , wherein: The instruction further causes the terminal to send capability information indicating whether the TCI emulation is supported to the base station.

19. A base station, comprising: at least one transceiver; at least one processor communicatively coupled to the at least one transceiver; as well as at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor, alone or in any combination, to cause the base station to: Sending configurations related to multiple transmission configuration indication (TCI) states to the terminal through higher layer signaling; Sending, via higher layer signaling, information related to TCI simulation to the terminal, where the information related to TCI simulation indicates that a quasi-colocation assumption of downlink data is based on two TCI states among the multiple TCI states; Sending downlink control information DCI for scheduling the downlink data to the terminal, where the DCI includes TCI information indicating the two TCI states and DMRS configuration information indicating one or more demodulation reference signal DMRS ports; as well as sending the downlink data using the DMRS of the one or more DMRS ports, Wherein, when the first type of TCI emulation is configured, the DMRS of the one or more DMRS ports is assumed to be quasi-colocated with reference signals associated with two TCI states for a quasi-colocation parameter set.

20. The base station according to claim 19, wherein The quasi-co-located parameter set includes Doppler frequency shift, Doppler spread, average delay and delay spread.

21. The base station according to claim 19, wherein When the second type of TCI emulation is configured, for a specific quasi-colocation parameter in the quasi-colocation parameter set, the DMRSs of the one or more DMRS ports are assumed to be quasi-colocated with a reference signal associated with a TCI state.

22. The base station according to claim 21, wherein: The specific quasi-co-located parameters correspond to Doppler frequency shift and Doppler spread.

23. The base station according to claim 19, wherein The instructions further cause the base station to send a medium access control (MAC) control element (CE) to the terminal, where the MAC CE activates the two TCI states for the TCI information in the DCI.

24. The base station according to claim 19, wherein The instructions further cause the base station to receive capability information from the terminal indicating whether the TCI emulation is supported.

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