Method and apparatus for transmitting and receiving reference signals in a wireless communication system

Abstract

The present invention relates to a communication technology and system that combines IoT technology with a 5G communication system that supports a higher data transmission rate than 4G systems. The present disclosure can be applied to intelligent services based on 5G communication technology and IoT-related technologies (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.). The invention of the present disclosure proposes a method and apparatus for transmitting and receiving reference signals for effectively using resources in a wireless communication system.

Description

Technical Field

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

[0002] In order to meet the demand for increased wireless data traffic 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. The 5G communication system is considered to be implemented in a super high frequency (mmWave) band (e.g., 60 GHz band) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves in the super high frequency band 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 the 5G communication system, system network improvement is being developed based on advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-point (CoMP), receiver interference cancellation, etc. In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superimposed coding (SWSC) as advanced coding modulation (ACM), and 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 is a human-centric connection network where humans generate and consume information, and is now evolving into the Internet of Things (IoT), in which distributed entities such as things exchange and process information without human intervention. Everything is the Internet of Everything (IoE), which is a combination of IoT technology and big data processing technology through connection with a cloud server. Recently, technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" have been studied for IoT implementation, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. Such an IoT environment can provide intelligent Internet technology (IT) services, which 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 various fields, including smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart devices, and advanced medical services.

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

[0005] [Technical Problem]

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

[0007] [Solution to the Problem]

[0008] A method performed by a terminal of a wireless communication system according to an embodiment of the present invention to achieve the task 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; and if it is determined to perform TCI simulation, performing signal transmission or reception based on a quasi-co-location (QCL) assumption determined according to the TCI simulation, where the TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between a plurality of reference reference signals and a plurality of target reference signals.

[0009] A method performed by a base station of a wireless communication system includes: 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, where the TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between a plurality of reference reference signals and a plurality of 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-co-location (QCL) assumption determined with reference to the TCI simulation, where the TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between a plurality of reference reference signals and a plurality of target reference signals.

[0011] The 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) simulation, and to send configuration information for configuring TCI simulation to the terminal, where the TCI simulation is a TCI configuration based on a one-to-many or many-to-one correspondence between a plurality of reference reference signals and a plurality of target reference signals.

[0012] [Advantages of the Invention]

[0013] The disclosed embodiments provide a method and apparatus for effectively transmitting or receiving uplink or downlink signals in a mobile communication system. Brief Description of the Drawings

[0014] Figure 1 is a diagram showing the 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 showing the 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 the configuration of a bandwidth part in a 5G communication system according to an embodiment of the present disclosure;

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

[0018] Figure 5 is a diagram showing 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 showing 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 showing an example of time axis resource allocation according to the subcarrier spacing 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 showing the radio protocol structure of a terminal and a base station in a single cell, carrier aggregation, and dual connectivity cases according to an embodiment of the present disclosure;

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

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

[0025] Figure 12 is a diagram showing an example of various operation scenarios of 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 SRS to each sub-band according to an embodiment of the present disclosure;

[0028] Figure 15 shows a method for a base station and a terminal to transmit or receive data considering a downlink data channel and rate matching resources according to an embodiment of the present disclosure;

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

[0030] Figure 17 is a diagram showing an example of a TRS mode 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 showing an example of TCI simulation according to an embodiment of the present disclosure;

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

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

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

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

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

[0040] Figure 26 FIG. 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 well-known technical content in the art and not directly related to the present disclosure will be omitted. The purpose of this omission of unnecessary descriptions is to prevent confusion of the main idea of the present disclosure and to more clearly convey the main idea.

[0043] For the same reason, in the 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 drawings, the same or corresponding elements have the same reference numerals.

[0044] Advantages and features of the present disclosure and ways to implement them will be apparent by referring to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and to inform 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 reference numerals denote the same or similar elements. In addition, when determining that the description may unnecessarily obscure the subject matter of the present disclosure, detailed descriptions of 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 vary according to the user, the user's intention, or habit. Therefore, the definition of the 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 terminals, and may be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, and node on a network. A terminal may include a user equipment (UE), mobile station (MS), cellular phone, smart phone, computer, or multimedia system capable of performing communication functions. In the present disclosure, a "downlink (DL)" refers to a radio link through which a base station transmits signals to a terminal, and an "uplink (UL)" refers to a radio link through which a terminal transmits signals to a base station. Further, in the following description, an LTE or LTE-A system may be described by way of example, but embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. Examples of such communication systems may include fifth-generation mobile communication technologies (5G systems, 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 that encompasses existing LTE, LTE-A, or other similar services. Further, based on the determination of those skilled in the art, 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 combinations 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, special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions executed via the processor of the computer or other programmable data processing apparatus create means 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 a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means 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 apparatus to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, such 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 the 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 in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the functions involved.

[0048] As used herein, a "unit" refers to a software element or a hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, the meaning of a "unit" is not always limited to software or hardware. A "unit" can be configured to be stored in an addressable storage medium or to run on one or more processors. Thus, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" can be grouped to synthesize a smaller number of elements or "units", or can be divided into a larger number of elements or "units". In addition, an element and a "unit" can also be implemented as one or more CPUs within a playback device or a secure multimedia card. In addition, a "unit" in an 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 an enhanced coverage service as an example, the present disclosure is not limited to and applicable to each embodiment, and can be used for a method of transmitting or receiving data channels, control channels, and reference signals 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 not significantly deviating from what is judged by those skilled in the art as the scope of the present disclosure.

[0050] In addition, when describing the present disclosure, a detailed description of known functions or configurations incorporated herein will be omitted when it is determined that such description may unnecessarily obscure the subject matter of the present disclosure. The terms to be described below are terms defined in consideration of the functions in the present disclosure, and may vary according to the user, the user's intention, or habit. Therefore, the definitions of the 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 indicates the radio link through which a User Equipment (UE) (or Mobile Station (MS)) sends data or control signals to a Base Station (BS) (eNode B), and the downlink indicates the radio link through which the BS sends data or control signals to the UE. The above multiple access scheme separates the data or control information of each user by allocating and operating time-frequency resources for sending data or control information for each user to avoid overlapping with each other, that is, to establish orthogonality.

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

[0054] eMBB aims to provide a higher data rate than that supported by existing LTE, LTE-A, or LTE-Pro. For example, in the 5G communication system, eMBB must provide a peak data rate of 20 Gbps in the downlink and 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 the maximum data rate to the UE. To meet this requirement, transmission / reception technologies including further enhanced Multiple-Input Multiple-Output (MIMO) transmission technologies need to be improved. 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, rather than using a transmission bandwidth of up to 20 MHz in a 2 GHz frequency band used in LTE to send signals.

[0055] The bandwidth part (BWP) technology is being developed in which, when a base station supports a wide bandwidth, the base station divides the entire carrier frequency band into multiple frequency bands that each terminal can support within the entire carrier frequency band. That is, when the base station supports BWP, if the BW capability of a specific terminal is small, a smaller frequency band can be supported for the terminal via BWP, and the energy consumption of the terminal can be reduced while reducing the frequency band by changing the BWP. In addition, while supporting different frame structures for each of the multiple BWPs, various services for one terminal can be supported via a change in BWP without latency. The BWP technology can be applied to a one-to-one corresponding control channel or data channel between a predetermined terminal and a base station. In addition, for a common signal transmitted by the base station to multiple terminals in the system, such as a synchronization signal, a physical broadcast channel (PBCH), and a control channel and a data channel for transmitting system information, BWP can be applied by transmitting only the control channel and the data channel in the configured BWP to reduce the energy of the base station.

[0056] In addition, mMTC is considered to support application services such as the Internet of Things (IoT) in a 5G communication system. 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 reduced cost of UEs. Since the Internet of Things provides a communication function while being provided to various sensors and various devices, it must support a large number of UEs in a cell (for example, 1,000,000 UEs / km2). In addition, UEs supporting mMTC may require a wider coverage range than other services provided by the 5G communication system because the UEs may be located in a shadow area such as a basement of a building that is not covered by the cell due to the characteristics of the service. UEs supporting mMTC must be configured to be inexpensive and require a very long battery life, such as 10 to 15 years, because it is difficult to replace the battery of the UE frequently.

[0057] Finally, URLLC is a mission-critical wireless communication service based on a cellular network that can be used for remote control of robots or machines, industrial automation, drones, remote healthcare, emergency alerts, etc. Therefore, URLLC must provide communication with ultra-low latency and ultra-high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 ms, and also requires a packet error rate of 10-5 or lower. Therefore, for a service supporting URLLC, the 5G system must provide a transmission time interval 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] These three services in the 5G communication system (hereinafter interchangeably used with "5G system"), namely, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in a single system. In this case, different transmission / reception techniques 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 can include radio resource control (RRC) signaling (system information block (SIB), master information block (MIB), etc. can be included in the RRC signaling), media access control (MAC) control element (CE), etc., and L1 signaling can 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 is a diagram showing the basic structure of the time-frequency domain as the radio resource area of the 5G communication system.

[0062] In Figure 1 , 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 the resource element (RE) 101, and it can be defined as 1 orthogonal frequency division multiplexing (OFDM) symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) 102 on the time axis and 1 subcarrier 103 on the frequency axis. consecutive REs (e.g., 12) in the frequency domain can constitute a resource block (RB) 104. consecutive OFDM symbols in the time domain can constitute a subframe 110.

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

[0064] Figure 2 shows an example of the structure of frame 200, subframe 201, and slot 202. One frame 200 can be defined as 10 ms. One subframe 201 can be defined as 1 ms, so one frame 200 can include a total of 10 subframes 201. One slot 202 or 203 can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ). One subframe 201 can include one or more slots 202 and 203, and the number of slots 202 and 203 in each subframe 201 can vary according to μ 204 and 205, i.e., the configuration value for the subcarrier spacing.

[0065] In Figure 2In the example, the slot structures for the cases of μ = 0204 and μ = 1205 are shown, where μ is the subcarrier spacing configuration value. If μ = 0204, one subframe 201 may include one slot 202, and if μ = 1205, one subframe 201 may include two slots 203. That is, the number of slots in each subframe can vary according to the configuration value μ for the subcarrier spacing, and thus, the number of slots in each frame can vary, and and can be defined in Table 1 below according to the corresponding subcarrier spacing configuration μ.

[0066] [Table 1]

[0067]

[0068] In a 5G wireless communication system, a synchronization signal block (SSB, SS block, SS / PBCH block, etc. can be used interchangeably) for initial access can be transmitted, and the synchronization signal block can 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 can first obtain downlink time-domain and frequency-domain synchronization from the synchronization signal via cell search and can obtain the cell ID. The synchronization signal can include the PSS and the SSS.

[0069] The terminal can receive the PBCH for transmitting the master information block (MIB) from the base station in order to obtain basic parameter values related to transmission or reception and system information, such as system bandwidth or related control information. Based on this information, the terminal can perform decoding on the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) in order to obtain the system information block (SIB). Then, the terminal exchanges identities with the base station via random access and initially accesses the network via operations such as registration and authentication.

[0070] The synchronization signal is a reference signal 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 according to the number of analog beams to be operated. The PSS and the SSS can be mapped to 12 resource blocks (RBs) and transmitted, and the PBCH can be mapped to 24 RBs and transmitted.

[0071] Subsequently, the 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 the configuration for the bandwidth part in a 5G communication system.

[0073] Figure 3 An example is shown where the terminal bandwidth (UE bandwidth) 300 is configured to have two bandwidth parts, namely 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 the configuration information, various parameters related to the bandwidth part can also be configured for the terminal. The base station can transmit the information to the terminal via higher layer signaling (e.g., Radio Resource Control (RRC) signaling). At least one of the configured one or more bandwidth parts can be activated. Whether the configured bandwidth part is active can be transmitted from the base station to the terminal in a semi-static manner via RRC signaling, or can be transmitted dynamically via Downlink Control Information (DCI).

[0077] According to some embodiments, the base station can configure an initial Bandwidth Part (BWP) for initial access for the terminal via the Master Information Block (MIB) before RRC connection. More specifically, during initial access, the terminal can receive configuration information for the search space and the control region (Control Resource Set (CORESET)), where the Physical Downlink Control Channel (PDCCH) for receiving the system information required for initial access (which can correspond to the Remaining System Information (RMSI) or System Information Block 1 (SIB1)) can be sent via the MIB. Each of the search space and the control region configured via the MIB can be considered as an identifier (Identity (ID)) 0. The base station can notify the terminal of the configuration information via the MIB, such as frequency allocation information, time allocation information, and the parameter set of control region #0. In addition, the base station can notify the terminal of the configuration information for the monitoring period and the timing for control region #0, that is, the configuration information for search space #0. The terminal can consider the frequency domain configured to control region #0 obtained from the MIB as the initial bandwidth part for initial access. In this case, the identity (ID) of the initial bandwidth part can be considered as 0.

[0078] The configuration of the bandwidth part 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 part configuration. For example, the base station can configure the frequency position of the bandwidth part (configuration information 2) for the terminal, so that the terminal can send or receive data at a specific frequency position within the system bandwidth.

[0080] According to some embodiments, in order to support different numerologies, the base station may configure multiple bandwidth parts for the terminal. For example, in order to support data transmission and reception using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz for the terminal, two bandwidth parts may be configured with subcarrier spacings of 15 kHz and 30 kHz respectively. Different bandwidth parts may be frequency-division multiplexed, and when data is to be transmitted or received at 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 transmits or receives data via the corresponding bandwidth, very large power consumption may occur. In particular, in the absence of traffic, monitoring the unnecessary downlink control channel with a 100 MHz large bandwidth 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 traffic, the terminal may perform monitoring in the 20 MHz bandwidth part, and when data is generated, the terminal may transmit or receive data by using the 100 MHz bandwidth part according to the indication of the base station.

[0082] In a method for configuring a bandwidth part, a terminal before RRC connection may receive configuration information of an initial bandwidth part via a Master Information Block (MIB) during initial access. More specifically, the terminal may be configured with a control region for a downlink control channel (which may be used interchangeably with a Control Resource Set (CORESET)), via which downlink control information (DCI) for scheduling a System Information Block (SIB) may be sent from the MIB of a Physical Broadcast Channel (PBCH). The bandwidth of the control region configured via the MIB may be regarded as the initial bandwidth part, and the terminal may receive a Physical Downlink Shared Channel (PDSCH) via the configured initial bandwidth part, through which the SIB is sent. In addition to receiving the SIB, the initial bandwidth part may be used for Other System Information (OSI), paging, and random access.

[0083] When configuring one or more bandwidth parts for the terminal, the base station may indicate to the terminal to change the bandwidth part by using the bandwidth part indicator field in the DCI. For example, in Figure 3In [the case where] the current active bandwidth part of the terminal is bandwidth part #1 305, the base station may indicate bandwidth part #2 310 to the terminal via the bandwidth part indicator in the DCI, and the terminal may switch the bandwidth part to 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 may be indicated by the DCI for scheduling the PDSCH or the Physical Uplink Shared Channel (PUSCH), and thus when receiving a request to switch the bandwidth part, the terminal may need to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI, which is easy in the bandwidth part switching. For this purpose, in this standard, for example, the requirement for adjusting the delay time (T BWP ) required when the bandwidth part is switched is regulated and may be defined below.

[0085] [Table 3]

[0086]

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

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

[0089] Reference Figure 4 , according to the above requirement for the bandwidth part switching delay time, when the terminal receives the 415 DCI including the bandwidth part switching indicator in time slot #1 430, the terminal may complete the switching to the new bandwidth part indicated by the bandwidth part switching indicator at a time point not later than time slot n + T BWP , and may perform transmission or reception on the data channel scheduled by the corresponding DCI in the switched new bandwidth part 410. When the base station will schedule a data channel with a new bandwidth part, the time domain resource allocation for the data channel may be determined by considering the bandwidth part switching delay time (T BWP ) 420 of the terminal. That is, when the base station schedules a data channel with a new bandwidth part, the method for determining the time domain resource allocation of 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 the DCI indicating the bandwidth part switching to indicate a value of the time slot offset (K0 or K2) smaller than the value of the bandwidth part switching delay time (T BWP ) 420.

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

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

[0092] A terminal may be configured by a base station with one or more bandwidth parts and may additionally be 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. For example, in Figure 3 , when the terminal is configured with bandwidth part #1 305 and bandwidth part #2 310, the terminal may be configured with transmission / reception parameter #1 for bandwidth part #1 305 and may be configured with transmission / reception parameter #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 parameter #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 parameter #2.

[0093] More specifically, the following parameters may be configured for the terminal by the base station.

[0094] First, the following information may be configured for the uplink bandwidth part.

[0095] [Table 4]

[0096]

[0097]

[0098]

[0099] According to the above table, the base station can configure parameters related to transmission in a specific cell (or a common cell or common), such as parameters related to the random access channel (RACH), uplink control channels (physical uplink control channel (PUCCH)) and uplink data channels (physical uplink shared channel) (corresponding to BWP-UplinkCommon). The base station can configure parameters related to transmission for a specific UE (or UE-specific), such as parameters related to the sounding reference signal (SRS), PUCCH, PUSCH, and unlicensed-based uplink transmission (configured grant PUSCH) (corresponding to BWP-UplinkDedicated).

[0100] Subsequently, the following information can be configured for the downlink bandwidth part.

[0101] [Table 5]

[0102]

[0103]

[0104] According to the above table, the base station can configure parameters related to reception in a specific cell (or a common cell or common), such as parameters related to the downlink control channel (physical downlink control channel (PDCCH)) and downlink data channels (physical downlink shared channel) (corresponding to BWP downlink common). The base station can configure parameters related to reception for a specific UE (or UE-specific), such as parameters related to radio link monitoring (RLM), PDCCH, PDSCH, and unlicensed-based downlink data transmission (semi-persistent scheduled PDSCH) (corresponding to BWP-UplinkDedicated).

[0105] Figure 5 FIG. is a diagram illustrating 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 part (UE bandwidth part) 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 one 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 part 510 on the frequency axis. One or more OFDM symbols can be configured on the time axis and can be defined as the control resource set duration 504. Refer to Figure 5In the example shown, control resource set #1 501 can be configured to have a control resource set duration of 2 symbols, and control resource set #2 502 can be configured to have a control resource set duration of 1 symbol.

[0106] The above-mentioned 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 identification 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 for configuring the control resource set is provided as follows.

[0107] [Table 6]

[0108]

[0109]

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

[0111] The 5G system supports interleaving and non-interleaving schemes as methods for transmitting PDCCH. The base station can configure for the terminal via higher layer signaling whether to perform interleaving or non-interleaving 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. According to the interleaving or non-interleaving transmission configured by the base station, the terminal can determine the CCE-to-REG mapping scheme in the corresponding control resource set in the following manner.

[0112] [Table 7]

[0113]

[0114] The basic unit of the downlink control channel, i.e., REG, may include the REs to which the DCI is mapped and the demodulation reference signals (DMRSs) for decoding the REs, i.e., the regions to which the reference signals (which may be used interchangeably with reference signals (RSs)) are mapped. Three DMRS REs may be included in one REG. The number of CCEs required to transmit 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 transmitted via L CCEs.

[0115] The terminal needs to detect the signal without knowing the information on the downlink control channel, and a search space defining a set of CCEs is defined for blind decoding. The search space is a set of candidates for the downlink control channel including CCEs, for which the terminal needs to attempt decoding at a given aggregation level, and since there are various aggregation levels forming a bundle with 1, 2, 4, 8, or 16 CCEs, the terminal may have multiple search spaces. The set of search spaces may be defined as a set of search spaces at all configured aggregation levels.

[0116] The search space may be classified into a common search space and a UE-specific search space. A certain group of terminals or all terminals may check the common search space of the PDCCH to receive common cell control information, such as dynamic scheduling of system information or paging messages. For example, a terminal may receive the PDSCH scheduling assignment information for transmitting the SIB 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 may be defined as a set of predetermined CCEs. The scheduling assignment information for the PDSCH or PUSCH for a specific UE may be received by checking the UE-specific search space of the PDCCH. The UE-specific search space may be specifically defined based on the identity of the terminal and the functions of various system parameters.

[0117] In the 5G system, the parameters of the search space for the PDCCH may 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 may configure for the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion in terms of symbols in a time slot for the search space, 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] According to 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 of Search Space Set 1, and may be configured to monitor DCI format B scrambled with Y-RNTI in the specific UE search space of Search Space Set 2.

[0123] According to the configuration information, one or more search space sets may exist in the common search space or the specific UE search space. For example, Search Space Set #1 and Search Space Set #2 may be configured as the common search space, and Search Space Set #3 and Search Space Set #4 may be configured as the specific UE search space.

[0124] In the common search space, the following combinations of DCI format and RNTI 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 format and RNTI 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 RNTIs may follow the following definitions and usages.

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

[0135] Temporary Cell RNTI (TC-RNTI): Used for PDSCH scheduling of a specific UE

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

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

[0138] System Information RNTI (SI-RNTI): Used for scheduling the PDSCH on which system information is sent. Interrupt RNTI (INT-RNTI): Used to indicate whether puncturing of PDSCH is performed

[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 formats specified above may follow the following definitions.

[0143] [Table 9]

[0144]

[0145]

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

[0147] [Equation 1]

[0148]

[0149] -L: Aggregation level

[0150] -N CI : Carrier index

[0151] -N CCE，p : Total number of CCEs present in control resource set p

[0152] -n μ s，f : Time slot index

[0153] -M (L) p，s，max : Number of PDCCH candidates for 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] Yp, -1 = nRNTI ≠ 0, A0 = 39827, A1 = 39829, A2 = 39839, D = 65537

[0157] -n RNTI : Terminal identity

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

[0159] In the case of a specific UE search space, the value of Y_(p, n μ s，f ) can correspond to a value that varies according to the time index and the identity of the terminal (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, which is a means for indicating or exchanging quasi-co-location (QCL) information between a terminal and a base station in a 5G communication system, will be provided.

[0161] The base station can configure and indicate the TCI state between two different RSs or channels through appropriate signaling to notify the QCL relationship between different RSs or channels. Different RSs or channels that are QCL indicate that when estimating a 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 at antenna port A to the channel measurement from antenna port B. It may be necessary to associate different parameters according to the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler frequency 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 can refer to some or all of various parameters, such as angle of arrival (AoA), power angle spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation quantities, transmit / receive beamforming, and spatial channel correlation quantities.

[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 up to two QCL relationships (qcl-type 1 and qcl-type 2) of the ID of the reference TCI state to the RS (i.e., the target RS). 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] 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 the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, the UE will expect the TCI-State to indicate one of the following quasi-co-location types:

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

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

[0172] For the 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" has the same periodic CSI-RS resources.

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

[0174] - "QCL-Type A" with the 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 CSI-RS resources, or

[0175] - "QCL-Type A" with the 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 SS / PBCH block, or

[0176] - "QCL-Type A" with the 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 CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition, or

[0177] - When "QCL-Type D" is not applicable, "QCL-Type B" with the CSI-RS resources in the 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-location types:

[0179] - "QCL-TypeA" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, if applicable, "QCL-TypeD" of the same CSI-RS resources, or

[0180] - "QCL-TypeA" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, if applicable, "QCL-TypeD" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition, or

[0181] - "QCL-TypeC" of the SS / PBCH block, and, if applicable, "QCL-TypeD" of the same SS / PBCH block.

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

[0183] - "QCL-TypeA" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, if applicable, "QCL-TypeD" of the same CSI-RS resources, or

[0184] - "QCL-TypeA" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, and, if applicable, "QCL-TypeD" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition, or

[0185] - "QCL-TypeA" of the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured not to have the higher layer parameter trs-Info and not to have higher layer parameter repetition, and, if applicable, "QCL-TypeD" of the same CSI-RS resources.

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

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

[0188] - has “QCL-Type A” of CSI-RS resources in an NZP-CSI-RS-ResourceSet configured with a higher layer parameter trs-Info, and, when applicable, has “QCL-Type D” of CSI-RS resources in an NZP-CSI-RS-ResourceSet configured with a higher layer parameter repetition, or

[0189] - has “QCL-Type A” of CSI-RS resources in an NZP-CSI-RS-ResourceSet configured not to have a higher layer parameter trs-Info and not to have a higher layer parameter repetition, and, when applicable, has “QCL-Type D” of 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 a frequency axis resource candidate allocation indicated via a BWP, the following detailed frequency axis resource allocation (Frequency Domain Resource Allocation (FD-RA)) methods may 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 0600, type 1605, and dynamic switch 610 that can be configured via a higher layer in NR.

[0193] Refer to Figure 6 , if a terminal is configured 600 to use only resource type 0 via higher layer signaling, some downlink control information (DCI) for allocating a PDSCH to the terminal has a bitmap including N RBG bits. 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 higher layer parameters (or higher layer signaling parameters) of the BWP size and rbg size allocated by a BWP indicator, as shown in the following [Table 12], and data is transmitted in the RBGs indicated by bits Figure 1 .

[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 to use only resource type 1 via higher layer signaling, some DCIs for allocating PDSCH to the terminal have frequency axis resource allocation information including the occupied frequency axis resource allocation information. Conditions for 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 DCIs for allocating PDSCH to the corresponding terminal have frequency axis resource allocation information, which includes bits for the large value 635 in the payload 615 of the configuration for resource type 0 and the payloads 620 and 625 of the configuration for resource type 1. Conditions for this case will be described later. In this case, one bit can be added to the first part (MSB) of the frequency axis resource allocation information in the DCI, and if the corresponding bit is 0, it can indicate the use of resource type 0, and if the corresponding bit is 1, it can indicate the use of resource type 1.

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

[0199] Referring to Figure 7 , the base station can indicate the time axis position of the PDSCH resource according to the OFDM symbol start position 700 and its length 705 in one time slot 710 dynamically indicated via DCI, and the scheduling offset K0 value and subcarrier spacing (SCS) (μ PDSCH and μ PDCCH ) of the data channel and control channel configured using a higher layer.

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

[0201] Referring to Figure 8 , if the subcarrier spacing of the data channel is the same as that 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 a predetermined time slot offset K0. On the other hand, if the subcarrier spacings (SCSs) of the data channel and the control channel are different as in 805 (μ PDSCH ≠μ PDCCH) If so, the time slot numbers of the data channel and the control channel are different. Therefore, the base station and the terminal can identify the scheduling offset based on the subcarrier spacing of the PDCCH according to the predetermined time slot offset K0.

[0202] Although Figure 8 an offset analysis method for the case where the subcarrier spacings between the data channel and the control channel are the same or different has been described in

[0203] To enable the terminal to effectively 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 can use DCI format 0_0 or DCI format 0_1 to allocate (schedule) the PDSCH to a cell.

[0205] When transmitted together with the CRC scrambled by the cell radio network temporary identifier (C-RNTI), the configured scheduling RNTI (CS-RNTI), or the new RNTI, DCI format 0_1 includes at least the following information:

[0206] - Identifier of the DCI format (1 bit): DCI format indicator always configured as 1

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

[0208] - Time domain resource allocation (0 to 4 bits): 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, and 1 indicates interleaved VRP to PRB mapping.

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

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

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

[0213] - HARQ process number (4 bits): Indicates the HARQ process number 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): Indicates the PUCCH resource among eight resources configured via higher layers

[0217] - PDSCH to HARQ_feedback timing indicator (3 bits): Indicates the HARQ feedback timing among eight feedback timing offsets configured via higher layers

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

[0219] - Identifier of DCI format (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 through which the PDSCH allocated by the corresponding DCI is transmitted

[0222] - Frequency domain resource allocation (payload is determined according to frequency axis resource allocation): Indicates the frequency axis resource allocation, where Indicates the size of the active DL BWP. For the detailed method, refer to the frequency axis resource allocation.

[0223] - Time domain resource allocation (0 to 4 bits): 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 VRP to PRB mapping. The 0 bit corresponds to the case where the frequency axis resource allocation is configured as resource type 0.

[0225] - PRB Bundle 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, 1 or 2 bits): Indicates the rate matching mode

[0227] - ZP CSI - RS Trigger (0, 1 or 2 bits): Indicator for triggering aperiodic ZP CSI - RS

[0228] For transport block 1:

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

[0230] - New Data Indicator (1 bit): Indicates whether the PDSCH corresponds to an initial transmission or a retransmission according to the handover

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

[0232] For transport block 2:

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

[0234] - New Data Indicator (1 bit): Indicates whether the PDSCH corresponds to an initial transmission or a retransmission according to the handover

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

[0236] - HARQ Process Number (4 bits): Indicates the HARQ process number 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): Indicates the PUCCH resource among eight resources configured via the higher layer

[0240] - PDSCH to HARQ_Feedback Timing Indicator (3 bits): HARQ feedback timing indicator indicating one of eight feedback timing offsets configured via the higher layer

[0241] - Antenna port (4, 5, or 6 bits): Indicates the DMRS port and the CDM group without 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): Indicator indicating whether a code block group is transmitted in the allocated PDSCH. 0 indicates that the corresponding CBG is not transmitted, while 1 indicates that the corresponding CBG is transmitted.

[0245] - CBG Clearing Information (0 or 1 bit): Indicator indicating whether the previous CBG is contaminated. 0 indicates that the previous CBG may be contaminated, while 1 indicates that the previous CBG is available (combinable) when receiving a retransmission.

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

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

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

[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 preferably understood that Table 16-1 and Table 16-2 are connected to each other.

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

[0262] The numbers 1, 2, and 3 represented by "Number of DMRS CDM Groups without Data" in the table respectively represent CDMR groups {0}, {0, 1}, and {0, 1, 2}. The DMRS port corresponds to the sequentially arranged index of the port used. The antenna port is represented as DMRS port + 1000. The CDM group of DMRS is associated with the method of generating the DMRS sequence and the antenna port, as shown in Tables 17 and 18. Table 17 shows the parameters when dmrs type = 1, while Table 18 shows the 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]

[0271] k' = 0, 1

[0272]

[0273] n = 0, 1,...

[0274] Figure 9FIG. is a diagram showing radio protocol structures of a terminal and a base station in a single cell, carrier aggregation, and dual connectivity cases according to an embodiment of the present disclosure.

[0275] Referring to Figure 9 , the radio protocol of the next-generation mobile communication system may include, respectively, NR Service Data Adaptation Protocol (SDAP) 925 and 970, 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 in a terminal and an NR base station.

[0276] The main functions of NR SDAP 925 and 970 may include some of the following functions.

[0277] - User data transmission function (transmission of user plane data)

[0278] - Function of mapping QoS flows and data bearers in the uplink and downlink (mapping between QoS flows and DRBs in both DL and UL)

[0279] - Function of marking QoS flow IDs in the uplink and downlink (marking QoS flow IDs in both DL and UL packets)

[0280] - Function of mapping a reflected QoS flow to a data bearer of an uplink SDAP PDU (mapping a reflected QoS flow to a DRB of a UL SDAP PDU)

[0281] For an SDAP layer device, a terminal may be configured via an RRC message 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 may use a 1-bit NAS reflected QoS configuration indicator and a 1-bit AS reflected QoS configuration indicator of the SDAP header to instruct the terminal to update or reconfigure mapping information for QoS flows and data bearers in the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used as data processing priority, scheduling information, etc. to support smooth services.

[0282] The main functions of NR SDAP 930 and 965 may include some of the following functions.

[0283] - Header compression and decompression function (header compression and decompression: only ROHC)

[0284] - User data transmission function (transmission of user data)

[0285] - Sequential transfer function (sequential transfer of upper-layer PDUs)

[0286] - Non-sequential transfer function (unordered transfer of upper-layer PDUs)

[0287] - Reordering function (reordering of received PDCP PDUs)

[0288] - Duplicate detection function (duplicate detection of lower-layer SDUs)

[0289] - Retransmission function (retransmission of PDCP SDUs)

[0290] - Encryption and decryption function (encryption and decryption)

[0291] - Timer-based SDU discard function (timer-based SDU discard in the uplink)

[0292] In the above, the reordering function of the NR PDCP device refers to the function of rearranging the order of the PDCP PDUs received in the lower layer in the order based on the PDCP sequence number (SN), which may include the function of transmitting data to the higher layer in the rearranged order, or may include the function of directly transmitting data regardless of the order, and may include the function of rearranging the order and recording the lost PDCP PDUs. It may include the function of reporting the status of the lost PDCP PDUs to the transmission side, and may include the function of requesting retransmission of the lost PDCP PDUs.

[0293] The main functions of NR SDAP 935 and 960 may include some of the following functions.

[0294] - Data transfer function (transfer of upper-layer PDUs)

[0295] - Sequential transfer function (sequential transfer of upper-layer PDUs)

[0296] - Non-sequential transfer function (unordered transfer of upper-layer PDUs)

[0297] - ARQ function (error correction by ARQ)

[0298] - Concatenation, segmentation, and reassembly function (concatenation, segmentation, and reassembly of RLC SDUs)

[0299] - Resegmentation function (resegmentation of RLC data PDUs)

[0300] - Reordering function (reordering of RLC data PDUs)

[0301] - Duplicate detection function (duplicate detection)

[0302] - Error detection function (protocol error detection)

[0303] -RLC SDU Discard Function (RLC SDU Discard)

[0304] -RLC Reconstruction Function (RLC Reconstruction)

[0305] In the above, the sequential transfer function of the NR RLC device refers to the function of sequentially transferring the RLC SDUs received from the lower layer to the higher layer. The sequential transfer function may include the following functions: when an RLC SDU is initially divided into multiple RLC SDUs and then received, reordering the divided RLC SDUs and transferring the divided RLC SDUs, which may include the function of rearranging the received RLC PDUs based on the RLC sequence number (SN) or the PDCP sequence number (SN), may include the function of rearranging the order and recording the lost RLC PDUs, may include the function of reporting the status of the lost RLC PDUs to the transmission side, may include the function of requesting retransmission of the lost RLC PDUs, and may include the following function: when there is a lost RLC SDU, only the RLC SDUs before the lost RLC SDU are sequentially transferred to the higher layer. Alternatively, the sequential transfer function may include the function that, even though there is a lost RLC SDU, if a predetermined timer has expired, all the RLC SDUs received before the timer starts are sequentially transferred to the higher layer, or may include the function that, even though there is a lost RLC SDU, if a predetermined timer has expired, all the RLC SDUs received up to the current time are sequentially transferred to the higher layer. Above, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the order of the sequence numbers or the sequence numbers) and may be transferred to the PDCP device regardless of the order (unordered transfer). In the case where the received RLC PDUs are 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 may be transferred to the PDCP device. The NR RLC layer may not include a concatenation function, and this function may be performed in the NR MAC layer or may be replaced by the multiplexing function of the NR MAC layer.

[0306] In the above, the disordered transfer function of the NR RLC device refers to the 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 initially dividing an RLC SDU into multiple RLC SDUs and then receiving them, 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 them to record the lost RLC PDUs.

[0307] NR MAC 940 and 955 can be connected to multiple NR RLC layer devices included in a terminal, and the main functions of the NR MAC may include some of the following functions.

[0308] - Mapping function (mapping between logical channels and transport channels)

[0309] - Multiplexing and demultiplexing functions (multiplexing / demultiplexing of MAC SDUs)

[0310] - Scheduling information reporting function (scheduling information reporting)

[0311] - HARQ function (error correction through HARQ)

[0312] - Function of priority handling between logical channels (priority handling between logical channels of a UE)

[0313] - Function of adjusting priorities between UEs (priority handling between UEs through dynamic scheduling)

[0314] - MBMS service identification function (MBMS service identification)

[0315] - Transmission format selection function (transmission format selection)

[0316] - Padding function (padding)

[0317] NR PHY layers 945 and 950 can perform channel coding and modulation on the higher layer data so that the channel-coded and modulated higher layer data becomes OFDM symbols, and transmit the OFDM symbols via the radio channel, or can perform demodulation and channel decoding on the OFDM symbols received via the radio channel in order to deliver them to the higher layer.

[0318] The detailed structure of the radio protocol structure can be variably changed according to 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 having a single structure up to the RLC layer but with the PHY layer 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 having a single structure up to the RLC but with the PHY layer multiplexed via the MAC layer, as shown in 920.

[0319] In LTE and NR, the terminal has a process of reporting the capabilities supported by the terminal to the corresponding base station while being 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. This message can include the base station's request for the terminal capabilities for each RAT type. The request for each RAT type can include band information for requesting the 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 the UE capability query message including the 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 the corresponding UE capability information message and report the corresponding UE capability information message multiple times. In the next-generation mobile communication system, the request for the terminal capabilities can be performed for MR-DC as well as NR, LTE, and EN-DC. For reference, the UE capability query message is generally sent in the initial stage after the terminal is connected, but the base station can request the UE capabilities under any conditions as needed.

[0320] As described above, the terminal that has received the request for the UE capability report from the base station configures the UE capability according to the RAT type and band information requested from the base station. Hereinafter, a method for a terminal in the NR system to configure the UE capability is described.

[0321] 1. If the terminal receives a list of LTE and / or NR bands via UE capabilities from the base station, the terminal configures the band combination (BC) separately (SA) for EN-DC and NR. That is, the terminal configures a candidate list of BCs for EN-DC and NR SA based on the bands requested from the base station via FreqBandList. These bands have priorities in the order described in FreqBandList.

[0322] 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 occur only when the LTE base station (eNB) requests "eutra" capabilities.

[0323] 3. Thereafter, the terminal removes the fallback BC from the candidate list of BCs configured in the above operation. Here, the fallback BC corresponds to the case of removing the band corresponding to at least one SCell from a certain superset BC, and 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., the LTE band. The BCs remaining after this operation constitute the final "candidate BC list".

[0324] 4. The terminal selects the BC to be reported by selecting the BC that conforms to the requested RAT type from the final "candidate BC list". In this operation, the terminal configures the list of supported band combinations in a predetermined order. That is, the terminal configures the BCs to be reported and the UE capabilities according to the pre-configured rat type order (nr -> eutra-nr -> eutra). The terminal configures the featureSetCombination for the configured supportedBandCombinationList and configures the "candidate feature set combination" list from the candidate BC list from which the fallback BC list (including equal or lower level capabilities) has been removed. The "candidate feature set combination" can include the feature set combinations of both NR and UTRA-NR BCs and can be obtained from the feature set combinations of the UE-NR capabilities and the UE-MRDC capabilities containers.

[0325] 5. If the requested rat type is eutra-nr and affected, the featureSetCombinations are included in both the UE-MRDC capabilities and the UE-NR capabilities containers. However, the feature set of NR is only included in the UE-NR capabilities.

[0326] 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 transmit / receive management on the corresponding terminal at a later time based on the UE capabilities received from the corresponding terminal.

[0327] In NR, the channel state information reference signal (CSI-RS) is supported as a reference signal for channel state reporting by the terminal, and each CSI-RS resource configuration configured by a higher layer can include at least the following detailed configuration information. However, the present disclosure is not limited to the following embodiments.

[0328] *NZP-CSI-RS - Resource ConfigID: The ID of the corresponding CSI-RS resource configuration

[0329] *NrofPorts: The number of CSI-RS ports included in the corresponding CSI-RS resource

[0330] *CSI-RS - Time Configuration: The transmission period and slot offset of the corresponding CSI-RS resource

[0331] *CSI-RS Resource Mapping: The OFDM symbol position in the slot of the corresponding CSI-RS resource and the subcarrier position in the PRB

[0332] *CSI-RS - Density: The frequency density of the corresponding CSI-RS

[0333] *CDM Type: The CDM length and CDM RE pattern of the corresponding CSI-RS

[0334] *CSI-RS - FreqBand: The transmission bandwidth and starting position of the corresponding CSI-RS

[0335] *Pc: The ratio of the energy of the Physical Downlink Shared Channel (PDSCH) per RE (EPRE) to the NZP CSI-RS ePRE

[0336] *PC - SS: The ratio between the SS / PBCH block EPRE and the NZP CSI-RS ePRE

[0337] *CSI-RS - ResourceRep: NZP CSI-RS resources belonging to a resource set cooperate with each other. If CSI-RS-ResourceRep is in the "ON" state, the terminal can identify that the same spatial domain transmission filter is applied to all NZP CSI-RS resources belonging to the resource set (i.e., the terminal can assume that the base station has used the same transmission beam). Hereinafter, the transmission beam can refer to the directional transmission signal, which can be used interchangeably with the application of the spatial domain 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 domain transmission filter is applied to all NZP CSI-RS resources belonging to the resource set (i.e., 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.

[0338] According to some embodiments, in NR, a 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, starting positions on the frequency axis and time axis of the CSI-RS component RE pattern and the number of REs (k') on the frequency axis and the number of REs (l') on the time axis of the CSI-RS component RE pattern, which can be configured according to the number of NR CSI-RS ports (X).

[0339] According to some embodiments, the CSI-RS component RE pattern is the basic unit for configuring the CSI-RS resource, and can include a total of YZ REs, including (Y = 1 + max(k')) adjacent REs on the frequency axis and (Z = 1 + max(l')) adjacent REs on the time axis. Referring to Table 19, the NR system supports different configuration freedoms of the frequency axis according to the number of CSI-RS ports configured in the CSI-RS resource.

[0340] Figure 10 Shows the designation of CSI-RS resource elements through CSI-RS resource mapping according to some embodiments. Refer to Figure 10 , Figure 10 is a diagram showing an example of CSI-RS RE designation through 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 subcarrier limitation, and the position of the CSI-RS RE can be assigned 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 assigned 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 assigned to the terminal through a 3-bit bitmap 1010. Similarly, the terminal can be assigned the time axis position of the CSI-RS RE through a total of 14-bit bitmaps. In this case, the length of the bitmap can vary according to the Z value (CSI-RS position within the time slot) associated with Table 19 as the frequency position assignment, but the principle is similar to the above description, so the detailed description thereof will be omitted.

[0341] [Table 19]

[0342]

[0343] For example, if X = 2 ports are configured, the base station may allocate frequency-axis RE positions according to 1005, and if the base station allocates frequency-axis subcarrier positions by 2 of 1005 and allocates time-axis OFDM symbol positions by 9 of 1015, the terminal may identify the RE position 1025 in the corresponding PRB 1020 for transmitting CSI-RS based on the allocated positions.

[0344] As described above, in NR, the base station may 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 the reporting settings for CSI-RS for functions other than CSI-RS measurement, there may be side effects of consuming the terminal power for generating unnecessary CSI or wasting uplink resources for unnecessary CSI reporting.

[0345] A method for measuring and reporting channel state in a 5G communication system will be described in detail below.

[0346] Channel state information (CSI) may include a channel quality indicator (channel quality information (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 for the above CSI measurement and terminal reporting.

[0347] For the above CSI measurement and reporting, the terminal may be configured via higher layer signaling with setting information for N (N≥1) CSI reports (CSI-ReportConfig), setting information for M (M≥1) RS transmission resources (CSI-ResourceConfig), and list information for one or two trigger states (CSI-AperiodicTriggerStateList, CSI-SemiPersistentOnPUSCH-TriggerStateList).

[0348] The configuration information for the above CSI measurement and reporting may be described more specifically in Tables 20 to 26 below.

[0349] [Table 20] CSI-ReportConfig

[0350] The IE CSI-ReportConfig is used to configure periodic or semi-persistent reporting on the PUCCH transmitted on a cell including the CSI-ReportConfig, or to configure semi-persistent or aperiodic reporting on the PUSCH triggered by DCI received on a cell including the CSI-ReportConfig (in this case, the cell on which the report is transmitted is determined by the received DCI). See TS 38.214

[19] , clause 5.2.1.

[0351] CSI-ReportConfig information element

[0352]

[0353]

[0354]

[0355]

[0356] CSI-ReportConfig field description

[0357] - carrier: Indicates in which serving cell to find the CSI-ResourceConfig indicated below. If this field is absent, the resource is on the same serving cell as this report configuration.

[0358] - codebookConfig: For codebook configuration of type I or type II, including codebook subset restriction.

[0359] - 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).

[0360] - cqi-Table: Which CQI table is used for CQI calculation (see TS 38.214

[19] , clause 5.2.2.1).

[0361] -csi-IM-ResourcesForInterference: CSI IM resources for interference measurement. It includes the csi-ResourceConfigId in the CSI-ResourceConfig in the configuration of the serving cell indicated by the above field "carrier". The CSI-ResourceConfig indicated here only contains 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.

[0362] -csi-ReportingBand: A continuous or discontinuous subset of subbands in the bandwidth part for which CSI should be reported. Each bit in the bitstring represents a subband. The rightmost bit in the bitstring 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 fewer than 24 PRBs (no subbands), this field does not exist; otherwise, this field exists, and the number of subbands can be from 3 (24 PRBs, subband size 8) to 18 (72 PRBs, subband size 4).

[0363] -dummy: This field is not used in the specification. If this field is received, the UE shall ignore it.

[0364] -groupBasedBeamReporting: Reporting based on the on / off of group beams (see TS 38.214

[19] , clause 5.2.1.4)

[0365] -non-PMI-PortIndication: Port indication for RI / CQI calculation. For each CSI-RS resource in the linked ResourceConfig for channel measurement, the port indication for each rank R indicates which R ports are used. It only applies to non-PMI feedback (see TS 38.214

[19] , clause 5.2.1.4.2).

[0366] 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. The CSI-ResourceConfigId of CSI-ResourceConfig is indicated together in CSI-MeasID and the above CSI-ReportConfigId; the second entry in non-PMI-PortIndication corresponds to the NZP-CSI-RS-Resource indicated by the second entry in nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the first entry in nzp-CSI-RS-ResourceSetList of the same CSI-ResourceConfig, and so on until the NZP-CSI-RS-Resource indicated by the last entry in nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the first entry in 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 nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet indicated by the second entry in nzp-CSI-RS-ResourceSetList of the same CSI-ResourceConfig, and so on.

[0367] - nrofReportedRS: The number (N) of measured RS resources to be reported per reporting configuration in non-group-based reporting. N <= N_max, where N_max depends on UE capability and is 2 or 4.

[0368] (See TS 38.214

[19] , clause 5.2.1.4) When the field is absent, the UE applies the value 1

[0369] -nzp-CSI-RS-ResourcesForInterference: NZP CSI RS resources for interference measurement. It includes the csi-ResourceConfigId in CSI-ResourceConfig in the configuration of the serving cell indicated by the above field "carrier". The CSI-ResourceConfig indicated here only contains NZP-CSI-RS resources. The BWP-Id in CSI-ResourceConfig has the same value as the bwp-Id in the CSI-ResourceConfig indicated by resourcesForChannelMeasurement.

[0370] -p0alpha: Index to determine the p0-alpha set for power control for this CSI report transmission (see TS38.214

[19] , clause 6.2.1.2).

[0371] -pdsch-BundleSizeForCSI: The PRB bundle size assumed for CQI calculation when reportQuantity is CRI / RI / i1 / CQI. If this field does not exist, the UE assumes that no PRB bundle is applied (see TS 38.214

[19] , clause 5.2.1.4.2).

[0372] -pmi-FormatIndicator: Indicates whether the UE should report a single (wideband) or multiple (sub-band) PMI. (See TS 38.214

[19] , clause 5.2.1.4).

[0373] -pucch-CSI-ResourceList: Indicates which PUCCH resources are used for reporting on the PUCCH.

[0374] -reportConfigType: Time-domain behavior of the report configuration

[0375] -reportFreqConfiguration: Report configuration in the frequency domain. (See TS38.214

[19] , clause 5.2.1.4).

[0376] -reportQuantity: CSI-related quantity to be reported. Corresponds to the L1 parameter "ReportQuantity" (see TS 38.214

[19] , clause 5.2.1).

[0377] -reportSlotConfig: Periodicity and slot offset (see TS 38.214

[19] , clause 5.2.1.4).

[0378] -reportSlotConfig-v1530: Extended value range for reportSlotConfig of semi-persistent CSI on PUSCH. If this field is present, the UE shall ignore the value provided in the legacy field (semiPersistentOnPUSCH.reportSlotConfig).

[0379] -reportSlotOffsetList: Timing offset Y for semi-persistent reporting using PUSCH. This field lists the allowed offset values. This list shall have the same number of entries as the pusch-TimeDomainAllocation list in PUSCH-Config. A 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 shall apply. DCI value 0 corresponds to the first reporting slot offset in this list, DCI value 1 corresponds to the second reporting slot offset in this list, and so on. The first report is sent in slot n+Y, and the second report is sent in n+Y+P, where P is the configured period.

[0380] Timing offset Y for aperiodic reporting using PUSCH. This field lists the allowed offset values. This list shall have the same number of entries as the pusch-TimeDomainAllocation list in PUSCH-Config. A 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 shall apply. DCI value 0 corresponds to the first reporting slot offset in this list, DCI value 1 corresponds to the second reporting slot offset in this list, and so on (see TS 38.214

[19] , clause 5.2.3).

[0381] -resourcesForChannelMeasurement: Resources for channel measurement. Includes the csi-ResourceConfigId of CSI-ResourceConfig in the configuration of the serving cell indicated by the above field "carrier". The CSI-ResourceConfig indicated here contains only 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.

[0382] -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 does not exist, the UE shall ignore this field.

[0383] -timeRestrictionForChannelMeasurements: The time domain measurement restriction for channel (signal) measurements (see TS 38.214

[19] , clause 5.2.1.1)

[0384] -timeRestrictionForInterferenceMeasurements: The time domain measurement restriction for interference measurements (see TS 38.214

[19] , clause 5.2.1.1)

[0385] [Table 21] CSI-ResourceConfig

[0386] The IE CSI-ResourceConfig defines a group with one or more NZP-CSI-RS-ResourceSet, CSI-IM-ResourceSet, and / or CSI-SSB-ResourceSet.

[0387] CSI-ResourceConfig information element

[0388]

[0389] CSI-ResourceConfig field description

[0390] -bwp-Id: The DL BWP in which the CSI-RS associated with this CSI-ResourceConfig is located (see TS 38.214

[19] , clause 5.2.1.2

[0391] -csi-ResourceConfigId: Used in CSI-ReportConfig to reference an instance of CSI-ResourceConfig

[0392] -csi-RS-ResourceSetList: If ResourceConfigType is "aperiodic", contains up to maxNrofNZP-CSI-RS-ResourceSetsPerConfig resource sets, otherwise 1 (see TS 38.214

[19] , clause 5.2.1.2)

[0393] -csi-SSB-ResourceSetList: The SSB resource list for beam measurement and reporting in a resource set (see TS 38.214

[19] , FFS_Section section).

[0394] - resourceType: The time-domain behavior of resource configuration (see TS38.214

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

[0395] [Table 22] NZP-CSI-RS-ResourceSet

[0396] The IE NZP-CSI-RS-ResourceSet is a set of non-zero power (NZP) CSI-RS resources (their IDs) and parameters for a specific set.

[0397] NZP-CSI-RS-ResourceSet information element

[0398]

[0399] NZP-CSI-RS-ResourceSet field description

[0400] - aperiodicTriggeringOffset: The offset X between the slot of the DCI that triggers a set of aperiodic NZP CSI-RS resources and the slot that transmits the CSI-RS resource set. Value 0 corresponds to 0 slots, value 1 corresponds to 1 slot, value 2 corresponds to 2 slots, value 3 corresponds to 3 slots, value 4 corresponds to 4 slots, value 5 corresponds to 16 slots, value 6 corresponds to 24 slots. When the field does not exist, the UE applies value 0.

[0401] - nzp-CSI-RS resources (nzp-CSI-RS-Resources): The 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 can have a maximum of 8 NZP CSI-RS resources

[0402] - repetition: Indicates whether repetition is on / off. If this field is set to "off" or if this field does not exist, the UE may not assume the same downlink spatial domain transmission filter is used in each symbol and the same NrofPorts are used to transmit NZP-CSI-RS resources within a resource set (see TS 38.214

[19] , clauses 5.2.2.3.1 and 5.1.6.1.2). It can only be configured for CSI-RS resource sets associated with a CSI-ReportConfig with L1 RSRP reported or "no reporting".

[0403] - trs-Info: Indicates that the antenna ports of all NZP-CSI-RS resources in a CSI-RS resource set are the same. If this field does not exist or is released, the UE applies the value "false" (see TS 38.214

[19] , clause 5.2.2.3.1).

[0404] [Table 23] CSI-SSB-ResourceSet

[0405] The IE CSI-SSB-ResourceSet is used to configure an SS / PBCH block resource set, which refers to the SS / PBCH indicated in ServingCell ConfigCommon.

[0406] CSI-SSB-ResourceSet information element

[0407]

[0408] [Table 24] CSI-IM resource set (CSI-IM-ResourceSet)

[0409] The IE CSI-IM-ResourceSet is used to configure a set that includes one or more CSI interference management (IM) resources (their IDs) and parameters of a specific set.

[0410] CSI-IM resource set information element

[0411]

[0412] [Table 25] CSI-AperiodicTriggerStateList

[0413] The CSI-AperiodicTriggerStateList IE is used to configure a list of aperiodic trigger states for the UE. Each code point of the DCI field "CSI Request" is associated with a trigger state. When the UE receives a value associated with a trigger state, it performs measurements and aperiodic reporting of CSI-RS (Reference Signals) on L1 according to all the entries in the associated report configuration information list of that trigger state.

[0414] CSI-AperiodTriggerStateList information element

[0415]

[0416] CSI-AssociatedReportConfigInfo field description

[0417] -csi-IM-ResourcesForInterference: The CSI-IM-ResourceSet for interference measurement. The entry number in the csi-IM-ResourceSetList in CSI-ResourceConfig is indicated by csi-IM-ResourcesForInterference in CSI-ReportConfig, and the CSI-ReportConfig is indicated by the above reportConfigId (1 corresponds to the first entry, 2 corresponds to the second entry, etc.). 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.

[0418] -csi-SSB-ResourceSet: The CSI-SSB-ResourceSet for channel measurement. The entry number in the csi-SSB-ResourceSetList in CSI-ResourceConfig is indicated by csi-IM-ResourcesForInterference in CSI-ReportConfig, and the CSI-ReportConfig is indicated by the above reportConfigId (1 corresponds to the first entry, 2 corresponds to the second entry, etc.).

[0419] -nzp-CSI-RS-ResourcesForInterference: NZP-CSI-RS resource set for interference measurement. The entry number in the nzp-CSI-RS-ResourceSetList in CSI-ResourceConfig is indicated by nzp-CSI-RS-ResourcesForInterference in CSI-ReportConfig, and the CSI-ReportConfig is indicated by reportConfigId above (1 corresponds to the first entry, 2 corresponds to the second entry, and so on).

[0420] -qcl-info: A list of references to TCI states, used to provide QCL sources and QCL types for each NZP-CSI-RS-Resource listed in 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 that tci-StateId value and is defined in the tci-StatesToAddModList in PDSCH-Config, which is included in the BWP-Downlink corresponding to the serving cell and the DL BWP to which resourcesForChannelMeasurement (in the CSI-ReportConfig indicated by the above reportConfigId) belongs. The first entry in qcl-info-forChannel corresponds to the first entry in nzp-CSI-RS-Resources of the NZP-CSI-RS-ResourceSet, the second entry in qcl-info-forChannel corresponds to the second entry in nzp-CSI-RS-Resourcse, and so on (see TS38.214

[19] , clause 5.2.1.5.1)

[0421] -reportConfigId: The reportConfigId of one of the CSI-ReportConfigToAddMod configured in CSI-MeasConfig

[0422] - Resource Set (resourceSet): The NZP-CSI-RS-ResourceSet used for channel measurement. The entry number in the nzp-CSI-RS-ResourceSetList in the CSI-ResourceConfig is indicated by resourcesForChannelMeasurement in the CSI-ReportConfig, and the CSI-ReportConfig is indicated by reportConfigId above (1 corresponds to the first entry, 2 corresponds to the second entry, and so on).

[0423]

[0424] [Table 26] CSI-SemiPersistentOnPUSCH-TriggerStateList

[0425] The CSI-SemiPersistentOnPUSCH-TriggerStateList IE is used to configure a trigger state list for the UE for semi-persistent reporting of channel state information regarding L1. Refer to clause 5.2 of TS 38.214

[19] .

[0426] CSI-SemiPersistentOnPUSCH-TriggerStateList information element

[0427]

[0428] For the above CSI report settings (CSI-ReportConfig), each report setting of the CSI-ReportConfig can be associated with one downlink (DL) bandwidth part identified by the higher layer parameter bandwidth part identifier (bwp-id), and the higher layer parameter bandwidth part identifier is given by the CSI resource setting of the CSI-ResourceConfig associated with the corresponding report setting.

[0429] As the time-domain reporting operation for each reporting setting of CSI-ReportConfig, "aperiodic", "semi-persistent", and "periodic" schemes can be supported, which can be configured for the terminal by the base station via a parameter of type reportConfig configured from a higher layer. The semi-persistent CSI reporting method can support the "semi-PersistentOnPUCCH" method and the "semi-PersistentOnPUSCH" method. In the periodic or semi-persistent CSI reporting method, the PUCCH or PUSCH resource where the CSI will be sent can be configured for the terminal by the base station via higher layer signaling. The periodicity and slot offset of the PUCCH or PUSCH resource where the CSI will be sent can be given by the numerology of the uplink (UL) bandwidth part configured to send the CSI report. In the aperiodic CSI reporting method, the base station can schedule the PUSCH resource where the CSI will be sent for the terminal via L1 signaling (e.g., the above DCI format 0_1).

[0430] Regarding the above CSI resource setting (CSI-ResourceConfig), each CSI resource setting of CSI-ReportConfig can include S (S≥1) CSI resource sets (configured via a higher layer parameter of CSI-RS-ResourceSetList). The CSI resource set list can 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 can be located in the downlink (DL) bandwidth part identified by a higher layer parameter of BWP-id and can be connected to the CSI reporting setting in the same downlink bandwidth part. The time-domain operation of the CSI-RS resources in the CSI resource setting can be configured as one of "aperiodic", "periodic", or "semi-persistent" from a higher layer parameter of the resource type. For the periodic or semi-persistent CSI resource setting, the number of CSI-RS resource sets can be limited to S = 1, and the configured periodicity and slot offset can 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 can be configured for the terminal by the base station via higher layer signaling and can include the following CSI resources.

[0431] - CSI-IM resources for interference measurement

[0432] - NZP CSI-RS resources for interference measurement

[0433] - NZP CSI-RS resources for channel measurement

[0434] Regarding a CSI-RS resource set associated with resource configuration, where the higher-layer parameter of the resource type is configured as "aperiodic", "periodic", or "semi-persistent", the triggering state of the CSI report setting has a report type configured as "aperiodic", and the resource configuration for channel or interference measurement on one or more component carriers (CCs) can be configured via the higher-layer parameter of CSI-AperiodicTriggerStateList.

[0435] The terminal's aperiodic CSI report can be performed using the PUSCH, the periodic CSI report can be performed using the PUCCH, and when triggered or activated via DCI, the semi-persistent CSI report can be performed using the PUSCH after activation by the PUSCH and MAC control element (MAC CE). As described above, the CSI resource configuration can also be configured as aperiodic, periodic, and semi-persistent. Combinations of CSI report settings and CSI resource configurations can be supported based on Table 27 below.

[0436] [Table 27]

[0437]

[0438]

[0439] The aperiodic CSI report can be triggered by the "CSI request" field in the above-mentioned DCI format 0_1, which corresponds to the DCI scheduling the PUSCH. The terminal can monitor the PDCCH, obtain the DCI format 0_1, and obtain the scheduling information of the PUSCH and the CSI request indicator. The CSI request indicator can be configured to have NTS (=0, 1, 2, 3, 4, 5, or 6) bits and can be determined by the higher-layer signaling of reportTriggerSize. One of the triggering states in one or more aperiodic CSI report triggering states that can be configured via the higher-layer signaling (CSI-AperiodicTriggerStateList) can be triggered by the CSI request indicator.

[0440] - If all bits in the CSI request field are 0, this can indicate that no CSI report is requested.

[0441] - 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 of the 2NTs - 1 triggering states can be indicated by the CSI request field.

[0442] - If the number M of CSI trigger states configured in CSI-AperiodicTriggerStateLite is less than or equal to 2NTs - 1, one of the M CSI trigger states can be indicated by the CSI request field.

[0443] Table 28 below shows an example of the relationship between the CSI request indicator and the CSI trigger states, where the CSI trigger states can be indicated by the corresponding indicators.

[0444] [Table 28]

[0445]

[0446]

[0447] The terminal can measure the CSI resources in the CSI trigger state triggered by the CSI request field, and then generate CSI (including at least one of the above 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 corresponding to the uplink data indicator (UL-SCH indicator) of DCI format 0_1 indicates "1", the terminal can multiplex the acquired CSI and the uplink data (UL-SCH) onto the PUSCH resource scheduled by DCI format 0_1 to send the same CSI and uplink data. If one bit corresponding to the uplink data indicator (UL-SCH indicator) of DCI format 0_1 indicates "0", the terminal can map only the CSI to the PUSCH resource scheduled by DCI format 0_1 without uplink data (UL-SCH) to send the same resource.

[0448] Figure 11 is a diagram showing an example of the aperiodic CSI reporting method.

[0449] In Figure 11In the example, the terminal can obtain DCI format 0_1 by monitoring PDCCH 1101, and can obtain the scheduling information of PUSCH 1105 and CSI request information therefrom. The terminal can obtain the resource information of CSI-RS 1102 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-RS 1102 based on the time point when DCI format 0_1 is received and the offset parameter (such as aperiodicTriggeringOffset) in the CSI resource set configuration (for example, 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 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 triggers the aperiodic CSI report is received and the time slot in which the CSI-RS resource is transmitted. For example, the parameter value of aperiodicTriggeringOffset and the offset value X can have a mapping relationship between them, as shown in Table 29 below.

[0450] [Table 29]

[0451]

[0452]

[0453] Figure 11 The example shows an example where the above offset value X is configured to 0 (X = 0). In this case, the terminal can receive CSI-RS 1102 in the time slot (corresponding to the time slot 0 in Figure 11 ) in which the DCI format 0_1 that triggers the aperiodic CSI report is received, and can report the CSI information measured based on the received CSI-RS to the base station via PUSCH 1105. The terminal can obtain the scheduling information (corresponding to the information of each field of the above DCI format 0_1) on PUSCH 1105 for the CSI report from DCI format 0_1. For example, in DCI format 0_1, the terminal can obtain the information about the time slot in which PUSCH 1105 is to be transmitted from the time domain resource allocation information of the above PUSCH 1105. In Figure 11 's example, the terminal obtains a K2 value of 3 as the time slot offset value corresponding to PDCCH to PUSCH, and thus, PUSCH 1105 can be transmitted in time slot 3 1109, and time slot 3 1109 is separated from time slot 0 1106 by 3 time slots, that is, the time point at which PDCCH 1101 has been received.

[0454] In 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. In Figure 11 the example of, the offset value X of CSI-RS is configured to 1 (X = 1). In this case, the terminal can receive CSI-RS 1112 in the time slot (corresponding to Figure 11 the time slot 0 1116) of the received DCI format 0_1 that triggers the aperiodic CSI report, and can report CSI information measured based on the received CSI-RS to the base station via PUSCH1115 in time slot 3 1119.

[0455] Figure 12 is a diagram showing examples of various operation scenarios of SRS. Referring to Figure 12 , at least the following three SRS operation scenarios can be considered in the NR system.

[0456] The base station 1 205 configures a unidirectional beam for the 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)), and in the case of periodic SRS or semi-persistent SRS, the terminal 1200 transmits SRS according to the transmission period and the offset of SRS, and in the case of aperiodic SRS, transmits SRS in response to an SRS request from the base station (at a predetermined time after the SRS request). In this case, no additional information for beam / precoding is required for SRS.

[0457] 2) The base stations 1215 and 1220 configure beams for the terminal 1210 in one or more directions, and the terminal 1210 can transmit multiple SRS beams formed in one or more directions. For example, as shown in the example of Figure 12 , SRS resource (or port) #0 can be configured to perform beamforming towards the base station 1215, and SRS resource (or port) #1 can be configured to perform beamforming towards the base station 1220. In this case, it is required that the base stations 1215 and 1220 not only notify the SRS request, but also notify the SRS beam / precoding information (different from method 1).

[0458] 3) The base station 1230 configures beams for the terminal 1225 in one or more directions, and the terminal 1225 can transmit multiple SRS beams formed in one or more directions. For example, as shown in the example of Figure 12As shown in the example, the base station can configure the terminal to transmit SRS by applying different beams / precodings 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, the terminal 1225 can provide channel state information to the base station 1230 via SRS #2 at time point A, and can provide channel state information to the base station 1230 via SRS #0 at time point A+alpha. In this case, it is required that the base station 1230 not only notify the SRS request, but also notify the SRS beam / precoding information, which is different from method 1).

[0459] The above description is provided based on SRS transmission, but can be similarly extended to different UL channels or / and RS transmissions, such as PRACH, PUSCH, PUCCH, etc., and the detailed description of all cases is omitted to prevent the subject matter of the present invention from being unclear.

[0460] Figure 13 FIG. is a diagram showing the uplink transmission structure of a 5G or NR system.

[0461] Referring to Figure 13 , the basic transmission unit of a 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.

[0462] A resource block (RB) 1310 is a resource allocation unit corresponding to one time slot based on the time domain, and can include 12 subcarriers based on the frequency domain.

[0463] The uplink structure can be mainly divided into a data area and a control area. Different from the LTE system, the control area can be configured at a predetermined uplink position and transmitted in a 5G or NR system. The data area includes a series of communication resources, and the communication resources 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 area. The control area includes a series of communication resources for downlink channel quality reports from each terminal, for receiving ACK / NACK of downlink signals, uplink scheduling requests, etc.

[0464] The terminal can transmit its own data and control information simultaneously in the data region and the control region. The symbols for transmitting SRS periodically within a time slot can be the last six symbol parts 1315, and can be transmitted based on the frequency domain via a preconfigured SRS transmission frequency band within the UL BWP. However, this is just an example, and the symbols capable of transmitting SRS can be extended to another time segment, or can be transmitted via a frequency band. When the RBs capable of transmitting SRS are transmitted in the frequency domain, the number of RBs can be a multiple of 4 RBs and can be at most 272 RBs.

[0465] In a 5G or NR system, N SRS symbols can be configured as 1, 2, or 4, and consecutive symbols can be transmitted. In a 5G or NR system, repeated transmission of SRS symbols is allowed. Specifically, the repetition transmission factor (repetition factor r) of SRS symbols 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. Or, four different antenna ports can be transmitted on four different symbols. In this case, each antenna port is mapped to one symbol, so repeated transmission of SRS symbols is not allowed.

[0466] In the case of LTE and NR, SRS can be configured based on the following higher layer signaling information (or its subset).

[0467] BandwidthConfig: Configures SRS bandwidth information. The exact value indicated by each code point can vary according to the uplink system BW value.

[0468] SubframeConfig (or ConfigIndex): Configures the SRS transmission period and transmission offset value. The exact value indicated by each code point can vary according to whether the system is FDD or TDD.

[0469] ackNackSRS - SimultaneousTransmission: Indicates whether concurrent transmission of ACK / NACK - SRS is performed

[0470] MaxUpPts: Indicates whether the frequency position initialization of SRS transmission is performed in the UpPTS.

[0471] Hopping: Indicates whether SRS hopping is performed and the hopping position and method using 2 - bit information.

[0472] Frequency domain position: Indicates the frequency domain position of SRS transmission.

[0473] Duration: Indicates whether periodic SRS transmission is performed.

[0474] Transmission comb: Indicates the comb offset value during SRS transmission.

[0475] Cyclic shift: Indicates the cyclic shift value during SRS transmission.

[0476] Antenna port: Indicates the number of SRS antenna ports used during SRS transmission. LTE can support 1, 2, or 4 ports.

[0477] 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, e.g., whether the SRS transmission type is periodic, semi-persistent, or aperiodic SRS transmission, some configuration information can be omitted.

[0478] The SRS can include Constant Amplitude Zero Auto-Correlation (CAZAC) sequences. The CAZAC sequences of each SRS transmitted from multiple terminals are configured to have different cyclic shift values. In addition, the CAZAC sequences generated by cyclic shift in one CAZAC sequence have the property of having zero correlation values with sequences having cyclic shift values different from its cyclic shift value. Therefore, by using these properties, the 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.

[0479] 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 SRS sub-band units 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 even or odd subcarriers in an SRS sub-band. In this case, each of the even or odd subcarriers can form a Comb.

[0480] The SRS sub-bands can be allocated to each terminal based on a tree structure. The terminal can perform frequency hopping on the SRSs allocated to each sub-band at each SRS transmission time point. Therefore, all transmit antennas of the terminal can transmit SRS via the entire uplink data transmission bandwidth.

[0481] Figure 14 It is a diagram showing the structure of allocating SRSs to each sub-band.

[0482] Refer to Figure 14 , an example is shown where, when the data transmission band corresponds to 40 RBs in the frequency domain, the SRSs are allocated to each terminal based on the tree structure configured by the base station.

[0483] In 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 sub-band with a bandwidth of 40 RBs. At the second level (b = 1), two SRS sub-bands can be generated from the SRS sub-band of the highest level (b = 0), and each SRS sub-band has a bandwidth of 20 RBs. Therefore, two SRS sub-bands can exist in the entire data transmission band of the second level (b = 1). At the third level (b = 2), five SRS sub-bands can be generated from one 20 RB SRS sub-band of the immediately higher level (b = 1), each sub-band has a bandwidth of 4 RBs, and ten SRS sub-bands can exist in one level, each sub-band has a bandwidth of 4 RBs.

[0484] According to the configuration of the base station, the tree structure configuration can have various level numbers, SRS sub-band sizes, and SRS sub-band numbers per level. The number of SRS sub-bands of level b generated from one SRS sub-band of a higher level can be defined as N b , and the index of N b SRS sub-bands can be defined as n b = {0,..., N b - 1}. As the sub-bands of each level change, terminals can be allocated according to each level sub-band as shown in Figure 14 . For example, terminal 114-00 can be allocated to the first SRS sub-band (n1 = 0) of the two SRS sub-bands with a bandwidth of 20 RBs at level b = 1, and terminal 214-01 and terminal 314-02 can be allocated to the first SRS sub-band (n2 = 0) and the third SRS sub-band (n2 = 2) under the second SRS sub-band with a bandwidth of 20 RBs, respectively. Based on these processes, the terminal can perform concurrent SRS transmissions via multiple component carriers (CCs), and perform SRS transmissions simultaneously via multiple SRS sub-bands in one CC.

[0485] Specifically, for the above SRS sub-band configuration, NR supports the SRS bandwidth configuration shown in Table 30 below.

[0486] [Table 30]

[0487]

[0488]

[0489] NR supports SRS frequency hopping based on the values in Table 30 above, and the detailed process is after Table 31 below.

[0490] [Table 31]

[0491]

[0492]

[0493]

[0494] As described above, 5G or NR terminals support a single-user (SU)-MIMO scheme and have up to four transmit antennas. In addition, NR terminals can transmit SRS simultaneously through multiple CCs or multiple SRS subbands in a CC. Different from the LTE system, in the 5G or NR system, various numbers can be supported, multiple SRS transmission symbols can be configured differently, and repeated SRS transmission via a repetition factor can also be allowed.

[0495] Therefore, considering the above, it is necessary to count SRS transmissions. Counting SRS transmissions can be used differently. For example, counting SRS transmissions can be used to support antenna switching based on SRS transmissions. Specifically, the time point of transmitting SRS, the antenna corresponding to the transmitted SRS, and the frequency band of transmitting SRS can be determined through SRS transmission counting.

[0496] In the following, rate matching operations and puncturing operations will be described in detail.

[0497] When the time and frequency resources A for transmitting a predetermined symbol sequence A overlap with the predetermined time and frequency resources B, considering the domain resource C where resources A and B overlap with each other, the rate matching or puncturing operation can be regarded as the transmission / reception operation of channel A. The detailed operations can follow the following content.

[0498] The rate matching operation will be described. The base station can transmit channel A by mapping channel A only to the resource area remaining after excluding the resources used for transmitting the symbol sequence A to the terminal from all resources A, and resource C corresponds to the area where resource A overlaps with resource B. For example, when the symbol sequence A includes {symbol #1, symbol #2, symbol #3, symbol #4}, resource A is {resource #1, resource #2, resource #3, resource #4}, resource B is {resource #3, resource #5}, the base station can sequentially map the symbol sequence A to the remaining resources {resource #1, resource #2, resource #4} after excluding {resource #3} corresponding to resource C from resource A, so as to transmit this resource. As a result, the base station can map the symbol sequence {symbol #1, symbol #2, symbol #3} to {resource #1, resource #2, resource #4} respectively to transmit this symbol sequence.

[0499] The terminal can determine resource A and resource B according to the scheduling information of symbol sequence A from the base station, and can determine resource C based on this scheduling information, where resource C is the overlapping area of resource A and resource B. The terminal can receive symbol sequence A based on the assumption that symbol sequence A has been mapped to and transmitted in the area 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 symbol sequence {symbol #1, resource #2, resource #4}. Symbol #2 and symbol #3 are respectively mapped to {resource #1, resource #2, resource #4} and transmitted in {resource #1, resource #2, resource #4}.

[0500] Subsequently, the shrinking operation will be described. When there is a resource C corresponding to the area where all of resource A used for transmitting symbol sequence A to the terminal overlaps with resource B, the base station can map symbol sequence A to all of resource A, but can perform transmission only in the resource area remaining after excluding resource C from resource A, and not perform transmission in the resource area corresponding to resource C. 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 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 can transmit only the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the remaining resources {resource #1, resource #2, resource #4} 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 can map the symbol sequence {symbol #1, symbol #2, symbol #4} to {resource #1, resource #2, resource #4} respectively to transmit this symbol sequence.

[0501] The terminal can determine Resource A and Resource B according to the scheduling information of Symbol Sequence A from the base station, and can determine Resource C based on this scheduling information, where Resource C is the overlapping area between Resource A and Resource B. The terminal can receive Symbol Sequence A based on the assumption that Symbol Sequence A has been mapped to all of Resource A but is transmitted only in the area remaining after excluding Resource C from 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 assume that Symbol Sequence A {Symbol #1, Symbol #2, Symbol #3, Symbol #4} is respectively mapped to Resource A {Resource #1, Resource #2, Resource #3, Resource #4}, but {Symbol #3} corresponding to {Resource #3} of Resource C is not transmitted. And the reception can be performed based on the following assumption: The symbol sequence {Symbol #1, Symbol #2, Symbol #4} corresponding to the remaining resources {Resource #1, Resource #2, Resource #4} 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 respectively mapped to {Resource #1, Resource #2, Resource #4} and is transmitted in {Resource #1, Resource #2, Resource #4}.

[0502] Subsequently, the rate matching resources will be described. Figure 15 It is a method for the base station and the terminal to transmit or receive data considering the downlink data channel and rate matching resources.

[0503] Figure 15 It shows the downlink data channel (PDSCH) 1501 and the rate matching resources 1502. 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 of the rate matching resources 1502 can include time axis resource allocation information 1503, frequency axis resource allocation information 1504, and periodicity information 1505. Hereinafter, the bitmap corresponding to the frequency axis resource allocation information 1504 is called the "first bitmap", the bitmap corresponding to the time axis resource allocation information 1503 is called the "second bitmap", and the bitmap corresponding to the periodicity information 1505 is called 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 can partially match the data channel 1501 with the rate matching resources 1502 to transmit the data channel 1501, and the terminal can perform reception and decoding based on the assumption that the data channel 1501 is rate matched in the partial rate matching resources 1502.

[0504] 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 via DCI using a bitmap scheme whether to perform rate matching on the data channel of each rate matching resource group. For example, when configuring four rate matching resources of RMR#1, RMR#2, RMR#3, and RMR#4, 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 as "1", and when rate matching is not required, the base station can configure each bit as "0".

[0505] In the 5G system, "RB symbol level" and "RE level" granularities are supported as methods for configuring the above rate matching resources in the terminal. More specifically, the following configuration methods can be used.

[0506] Hereinafter, the method for configuring the RB symbol level will be described. The terminal can configure up to four RateMatchPatterns for each bandwidth part via higher layer signaling, and one RateMatchPatterns can include the following.

[0507] - As reserved resources within the bandwidth part, the resources of the time and frequency resource regions where the corresponding reserved resources are configured can be included through a combination of a bitmap at the RB level and a bitmap at the symbol level on the frequency axis. The reserved resources can span one or two time slots. A time domain pattern (periodicityAndPattern) can be additionally configured, in which the time domain and frequency domain including a pair of corresponding bitmaps at the RB level and the symbol level are repeated.

[0508] - It can include the time domain and frequency domain resource regions configured as control resource sets within the bandwidth part and the resource regions corresponding to the time domain pattern configured by the search space configuration, where the corresponding resource regions are repeated in the search space configuration.

[0509] Subsequently, the method for configuring the RE level will be described. The terminal can be configured via higher layer signaling with the following.

[0510] As configuration information (LTE-CRS-ToMatchAround) of REs corresponding to an LTE specific cell reference signal or a 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 central subcarrier position of the LTE carrier from a 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 a 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.

[0511] - It may include configuration information of a resource set corresponding to one or more zero-power (ZP) CSI-RS within a bandwidth part.

[0512] Figure 16 FIG. is a diagram illustrating an uplink-downlink configuration considered in a 5G communication system. In a 5G communication system, the uplink-downlink configuration of symbols / time slots may have three phases. First, via specific cell configuration information 1610 based on system information, the uplink-downlink of symbols / time slots can be configured semi-statically on a symbol basis. 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 1611 from the starting point of each mode, the number of symbols in subsequent time slots 1612, the number of consecutive uplink time slots 1613 from the end of the mode, and the number of symbols in subsequent time slots 1614 can be indicated. In this case, the terminal can determine that the time slots and symbols not indicated as uplink and downlink are flexible time slots / symbols.

[0513] Second, 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 the numbers 1623 and 1625 of consecutive downlink symbols from the starting symbol of each time slot and the 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.

[0514] Finally, to dynamically change the downlink signal transmission section and the uplink signal transmission section, the UL / DL configuration can be indicated to the terminal group via DCI format 2_0 1330. The base station can indicate whether each symbol indicated as a flexible symbol (i.e., a symbol not indicated as downlink or uplink) in each time slot is a downlink symbol, an uplink symbol, or a flexible symbol via the slot format indicator (SFI) 1631 or 1632 included in the downlink control channel. The 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 preconfigured, as shown in Table 32 below.

[0515] [Table 32]

[0516]

[0517] In the NR system, the tracking reference signal (i.e., TRS) can be configured for fine time / frequency tracking of the base station. In the standard, the TRS can be referred to by another term, such as CSI-RS for tracking, but for the convenience of description in the specification, the TRS will be referred to as TRS. The TRS can be transmitted in one (X = 1) time slot or two (X = 2) consecutive time slots with a specific period (e.g., 10 ms or 20 ms), and this is called a TRS burst.

[0518] Figure 17 The RE pattern of the TRS according to some embodiments is shown.

[0519] Referring to Figure 17 , an example of the TRS pattern available within one time slot is shown. As Figure 17 shown, the TRS can have a frequency RE density of three REs / RBs / ports and can repeat the TRS RE every four subcarriers. (That is, one TRS port is transmitted in one of RE0, 1, 2, and 3 shown in the TRS OFDM symbol RE in Figure 17 ). In addition, according to some embodiments, the TRS can be transmitted in one of the three OFDM symbol pairs {5, 9}, {6, 10}, and {7, 11} in the sub-6 GHz band called frequency range 1 (FR1), and can be transmitted in one of the 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 the band equal to or higher than 6 GHz called frequency range 2 (FR2). It should be noted that Figure 17The position of the middle OFDM symbol is an example of the TRS configuration, and the actual transmission position can vary according to the transmission of the base station.

[0520] Figure 18A FIG. is a diagram showing a 1-port CSI-RS configuration according to some embodiments.

[0521] Reference Figure 18A , showing an example of the I-port CSI-RS configuration of the TRS RE pattern for coverage Figure 17 . According to Figure 20 , the base station can configure one resource set as one 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 RE / RB / port. If a TRS burst with X = 1 is used, the base station can configure CSI-RS resources #0 and #1.

[0522] Figure 18B FIG. is a diagram showing another 1-port CSI-RS configuration according to some embodiments. If an X = 2 TRS burst, the base station configures all CSI-RS resources #0, #1, #2, and #3 1800, 1810, 1820, and 1830. In the case of an X = 1 or X = 2 TRS burst, for the CSI-RS resources configured within 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 a TRS, the base station can configure no corresponding reporting setting (CSI-ReportConfig) (i.e., no reporting setting involving the corresponding CSI-RS resource), or can set the reporting setting configuration value to "none", so as to ensure that the terminal uses the corresponding CSI-RS resource for time / frequency tracking and does not generate a CSI report.

[0523] In Figure 18A and Figure 18B , the subcarrier position and OFDM symbol position of the I-port CSI-RS resource can be appropriately changed according to Figure 17 the TRS subcarrier position.

[0524] The TRS can be sent in various forms, such as periodic, semi-persistent, or aperiodic TRS. The periodic TRS (P-TRS) is sent periodically before the RRC reconfiguration according to the periodicity and slot offset values configured by the RRC. The semi-persistent TRS (SP-TRS) is sent based on the periodicity and slot offset values configured by the RRC after being activated by the MAC CE or DCI and before being deactivated, and the aperiodic TRS (A-TRS) is triggered by the MAC CE or DCI and sent without any configuration of periodicity. The urban or slot offset value. At this time, the A-TRS trigger and the A-TRS transmission timing can have an offset configured via a higher layer, or can follow a predetermined value (for example, transmit the A-TRS in the same slot as the A-TRS trigger).

[0525] 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 the 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 co-location (QCL). For example, the base station can configure at least one SP-TRS or P-TRS as the QCL reference RS in the A-TRS to extract channel statistical values, such as delay spread, average delay, Doppler spread, and Doppler frequency shift (QCL type A), or extract spatial parameters, such as the TX beam or RX beam (QCL type D).

[0526] The bandwidth information of the TRS is allocated through the higher layer parameters of the FreqBand. If the bandwidth of the BWP in which the corresponding TRS is sent is narrower than 52 RBs, the bandwidth of the TRS is the same as the bandwidth of the BWP. If the bandwidth of the BWP in which the corresponding TRS is sent is greater than or equal to 52 RBs, the bandwidth of the TRS is configured to 52 RBs.

[0527] Figure 19 It is a diagram illustrating the structure of the signal processing device of the terminal according to an embodiment of the present invention. The structure of the signal processing device may include at least one of the antenna port, antenna panel, and baseband processor of the terminal.

[0528] Reference Figure 19 Referring to, the terminal 1900 may include multiple antenna ports or panels 1905, 1910, and 1915. Figure 19It is shown that the terminal has three antenna ports or panel structures, but it is only an example, and in practical applications, all terminals do not have to be limited to this. More or fewer antenna ports or panel structures can be used. Multiple antenna ports or panels can be connected to the antenna port / panel selector (antenna selection module) 1920, or can be connected to the signal processor (baseband processing module) 1930 via the antenna port / panel gain combiner (antenna combination module / MIMO module) 1925, etc., according to various environments and conditions, such as the manufacturing cost of the terminal, the target performance, and the operating frequency bands 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 combination module / MIMO module) 1925 are generally referred to as "antenna signal processors". The signal processor (baseband processing module) 1930 can receive the RF signal or digital signal passing through the antenna signal processor, can measure the reference signal according to the above process, and can perform the TCI / QCL process or measure the data symbol for demodulating the data. Most existing terminals select and use the antenna port / panel selector (antenna selection module) 1920 or the antenna port / panel gain combiner (antenna combination module / MIMO module) 1925 respectively for the purpose of reducing power consumption or reducing complexity / cost or expanding the wireless communication coverage or increasing the capacity.

[0529] In order to appropriately obtain various gains according to the situations caused by antenna selection, connection, and / or combination, future terminals can implement multiple antenna signal processors simultaneously 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 port / panel, and according to the increase of the frequency operating band in wireless communication (for example, the FR2 band higher than or equal to 6 GHz or the FR4 band higher than or equal to 52.6 GHz), the minimum interval required between each module shortens inversely proportional to the frequency (proportional to the wavelength), so this trend can be gradually accelerated.

[0530] As described above, when a terminal operating multiple antenna ports / panels has an antenna signal processor with multiple functions, high performance can be theoretically obtained through excellent environmental adaptability. However, in order to achieve excellent adaptability and convert it into coverage gain or communication capacity gain, separate reference signal transmission and measurement are required for each case, and separate processing of the TCI and QCL measurements and applications of the terminal is also required for each case. This indicates that compared with the traditional system that adopts a single antenna signal processing method to obtain wireless communication performance gain through flexible antenna signal processing, a large amount of reference signal transmission and measurement burden, as well as additional costs, such as the improvement of the TCI and QCL measurement and application capabilities of the terminal, are required.

[0531] The present disclosure provides a TCI simulation method considering various antenna ports and panel structures of a terminal to reduce the reference signal transmission burden, thereby improving wireless communication efficiency. Hereinafter, the main points of the present disclosure will be described through specific embodiments.

[0532] <First Embodiment>

[0533] The first embodiment provides a method for reducing the reference signal transmission burden through TCI or / and QCL (hereinafter referred to as TCI / QCL) simulation. According to this embodiment, the TCI / QCL simulation is a combination of one or more of the following: 1) a method of generating one TCI state or one QCL assumption by appropriately synthesizing two or more different TCI states or two or more different QCL assumptions, 2) a method of generating two or more different TCI states or two or more different QCL assumptions by appropriately dividing one TCI state or one QCL assumption. And so on, and there may be various detailed methods.

[0534] Figure 20 is a diagram showing an example of TCI simulation according to an embodiment of the present disclosure.

[0535] Figure 20 is a diagram showing a specific example of a method of generating one TCI state or one QCL assumption by appropriately synthesizing two or more different TCI states or two or more different QCL assumptions, which is the first method among two TCI simulation methods. Refer to Figure 20 , the terminal 2002 can establish an uplink or downlink wireless communication link with one or more transmit and receive 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 this case, for ease of explanation, the physical positions of the transmission points 2001 and 2011 are shown as different, but the present disclosure does not have to be limited to this in actual applications, and some transmission points can have the same physical position. (For example, the terminal can transmit or receive signals through two different transmit points, each with two panels, in which case some of the four panels can share the same rank or vertical physical position.)

[0536] In this specification, generating a QCL assumption or starting or performing a QCL / TCI procedure may instruct the terminal to receive QCL configuration information from the base station, receive a channel or reference signal configured as a QCL reference RS in the configuration information, and generate all or some statistical information of the channel according to the QCL type in Table 10, so as to use it for channel estimation via the reception of the QCL target RS configured in the corresponding QCL configuration information.

[0537] 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 indicated via L1 signaling for cases with 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 indicated via L1 signaling to have different QCL assumptions (which may include UL QCL, DL-UL joint QCL, or spatial relation information, etc.) or different UL-TCI states. In practical applications, in order to help the terminal easily determine different transmission points, independent higher layer parameters may be defined and clearly declared. As described above, there may be differences in the terms required for describing the downlink and uplink, but in order not to obscure the key points of the description, the following description will mainly relate 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.

[0538] As an example of a method for a base station to notify a terminal of different transmission points for transmitting a specific reference signal or channel (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 to have different QCL assumptions or different TCI states, etc.), the base station can configure an additional indicator for each CORESET, such as a CORESET pool index, and can agree to assume that RSs (DMRS, CSI-RS, SRS, etc.), data channels (PDSCH, PUSCH, etc.), or control channels (PDCCH and PUCCH) that are allocated or associated with a DCI transmitted in a CORESET with the same value of the additional indicator are transmitted from the same transmission point. For example, the terminal can assume that the PDCCH transmitted in a CORESET for which the CORESET pool index is not configured, or the PDCCH transmitted in a CORESET for which the CORESET pool index value is configured to 0, and the PDSCH allocated by the DCI included in the PDCCH are transmitted from a first transmission point, and the PDCCH transmitted in a CORESET for which the CORESET pool index value is configured to 1 and the PDSCH allocated by the DCI included in the corresponding PDCCH are transmitted from a second transmission point.

[0539] Examples of classifying transmission points focus on indicators that conform to CORESETs, but this is for ease of description, and the present disclosure is not limited thereto in practical applications. In addition, the present disclosure can be similarly extended by introducing additional indicators in various configurations such as PUCCH, PUCCH groups, cells, cell groups, BWPs, and BWP groups.

[0540] 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.

[0541] To avoid obscuring the key points of the present disclosure in the following description, it should be noted that there are situations where cases configured with QCL or TCI states are collectively referred to as "the base station configures a specific QCL or TCI state for the terminal via higher layer signaling", "a specific QCL or TCI state is activated via higher layer signaling or L1 signaling", or "a specific QCL or TCI state is indicated via L1 signaling".

[0542] In the following description, two transmission points are assumed, but this is for ease of description, and the case where there are three or more transmission points can also be supported in a similar manner.

[0543] Reference Figure 20, the terminal 2002 can receive at a specific time point or in a specific time / frequency resource 2000 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 turned on or off among the CSI-RS)) 2003 from the first transmission point 2001, and can generate QCL assumptions or start the TCI process. In addition, the terminal 2002 can receive at a specific time point or in a specific time / frequency resource 2010 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 turned on or off in the CSI-RS)) 2013 from the second transmission point 2011, and can generate QCL assumptions or start the TCI process.

[0544] 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 RSs should be transmitted in the same manner as the above QCL target RSs to obtain the best reception performance. That is, for the best reception performance of the QCL target RSs 2024 and 2025, it is also necessary to receive the QCL reference RSs from the first and second transmission points 2001 and 2011 simultaneously. However, for each transmission scenario at the first and second transmission points, this requires transmitting QCL reference RSs different from the QCL reference RSs 2002 and 2013, so an additional large amount (in some cases, an additional 50% or more) of reference signal transmission burden is required. In addition, in many cases, there is a problem of concurrent transmission of QCL reference RSs that need to be used in the manner of a common cell or common group.

[0545] To solve this problem, TCI simulation (QCL synthesis or TCI synthesis, and TCI simulation mode #1) can be performed according to one or a combination of the following methods. As Figure 20 shown, 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 notify 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 the QCL and / or TCI information of the QCL target RSs transmitted in cooperation without performing concurrent transmission or reception of the QCL reference RSs used in the manner of a common cell or common group.

[0546] The current NR system supports the function of connecting (activating) multiple TCI states to one TCI field code point in DCI by using higher-layer signaling (e.g., MAC CE), thereby supporting multi-TRP transmission. However, this function applies different TCI states to the corresponding DMRS CDM groups by dividing the DMRS ports indicated by the corresponding DMRS port indication field of DCI based on the DMRS CDM group (i.e., in the normal 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 aims to support by integrating (integrating and applying multiple QCL reference RSs) different TCI states or different QCL assumptions in one DMRS port (i.e., one QCL target RS port).

[0547] For the purpose of the present disclosure, one of the following three methods can be applied to integrate (integrate multiple QCL reference RSs) and apply different TCI states or different QCL assumptions to one QCL target RS port.

[0548] Method 1: The first method is based on Rel-16 PDSCH DMRS TCI activation MAC CE or its extension, and connects multiple TCI states or QCL assumptions to be applied simultaneously to the DMRS port indicated by DCI. In this case, separate higher-layer parameters are defined, and thus the terminal can determine whether the connection is interpreted according to 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 TCI simulation is performed according to the following disclosure (i.e., a new TCI state is derived by synthesizing the first TCI state and the second TCI state and applied to all indicated DMRS ports). The separate higher-layer parameters can be defined as independent RRC parameters, or the higher-layer parameters for Rel-16 multi-TRP can be used to indicate the above. According to Method 1, the TCI states and QCL configurations in Table 11 are reusable, and thus TCI simulation can be supported with minimal standard changes, but there is a disadvantage that Rel-16 multi-TRP and TCI simulation operations cannot be performed simultaneously.

[0549] 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 RSs related to 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-type 1 are combined with the QCL parameters indicated by qcl-type 1-r17 to generate new first QCL information, and the QCL parameters indicated by qcl-type 2 are combined with the QCL parameters indicated by qcl-type 1-r17 to generate new second QCL information. Table 33 relates to an example where two QCL reference RSs are referred to, but can be extended in the same way for 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 qcl-type 1-r17 and qcl-type 2-r17 below, and the parameter pairs to be used can be directly indicated from {qcl-type 1, qcl-type 2} and {qcl-type 1-r17, qcl-type 2-r17}, or whether to use the new parameter pairs generated by combining the two parameter pairs.

[0550] [Table 33]

[0551]

[0552]

[0553] Method 3: The third method is a method that allows 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, referring to the corresponding TCI state, the terminal can refer to the channel parameters of two different QCL reference RSs transmitted from two different transmission points. In this case, the terminal can directly synthesize the measurement values of the QCL reference RSs in the corresponding QCL configuration, or synthesize the QCL parameter values independently measured in the QCL reference RSs in the corresponding QCL configuration in order to generate new QCL information. Table 34 relates to an example where two QCL reference RSs are referred to, but can be extended in the same way with respect to three or more QCL reference RSs. Method 3 also allows notification of whether the newly defined independent higher layer signaling parameter notifies 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 statistical characteristics such as average gain can be supported for TCI simulation. The detailed method of TCI simulation based on channel statistical characteristics (such as average gain) is provided in detail below.

[0554] [Table 34]

[0555]

[0556]

[0557] Tables 33 and 34 are examples for providing the connection relationship (association) between one target RS and multiple reference RSs, and in practical applications, various applications are possible, and details such as the number of reference RSs can also be appropriately changed.

[0558] According to one of the foregoing methods, the terminal can receive the association information or different QCL assumptions between the QCL target RS port and multiple TCI states from the base station, and can accordingly perform one of the following TCI / QCL synthesis methods.

[0559] Method 1: The first method of generating a new QCL parameter value (the combined QCL assumption) by synthesizing QCL parameter values (individual QCL assumptions) measured or extracted from multiple QCL references is the method of using the weighted sum of the individual QCL assumptions as the combined QCL assumption. There can be integers with the same value as an example of multiplying each QCL assumption in the weighted sum by a coefficient. The terminal can generate the combined QCL assumption by assuming each QCL assumption as an independent random variable and multiplying all the same values by the same integer value (e.g., 1). According to this example, when the target RS is connected to a first reference RS with an average delay value = A and at the same time connected to a second reference RS with an average delay value = B, the combined average delay value is assumed to be A + B.

[0560] As another example, to control the synthesis of the secondary statistical characteristic values of the channel in the continuously increasing direction (e.g., delay spread or Doppler spread), the combined QCL assumption can be generated by performing multiplication and addition using real numbers with the same value (e.g., 1 / N if there are N individual QCL assumptions). According to this example, when the target RS is connected to a first reference RS with an average delay value = A and at the same time connected to a second reference RS with an average delay value = B, the combined average delay value is assumed to be (A + B) / 2.

[0561] According to this method, one 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 this method, it can also be agreed to apply different methods according to the QCL parameter type in the QCL assumption. For example, it can be recognized that the variable corresponding to the main characteristic of the channel (based on the average or instantaneous value of a given measurement interval) is determined according to the sum of the weighted sum using an integer with the same value as the coefficient in the first example (e.g., 1) and the variable corresponding to the secondary characteristic of the channel (the variance value based on a given measurement interval) (e.g., average delay, Doppler shift, or spatial RX parameter). The variable corresponding to the secondary characteristic of the channel such as delay spread or Doppler spread is determined according to the sum of the weights using real numbers with the same value as the coefficient in the second example (e.g., 1 / N), or an independent higher layer signaling parameter for configuration is introduced. The higher layer signaling parameter can indicate the coefficient (or one method of the example) to be applied to each QCL parameter, or can indicate that one method of the example is applied to a pre-configured set of one or more specific QCL parameters.

[0562] Method 2: The second method of generating a new QCL parameter value (a combined QCL assumption) by synthesizing QCL parameter values (individual QCL assumptions) measured or extracted from multiple QCL reference RSs is a method of using a QCL weighted sum as the combined QCL assumption by using independent values other than the QCL configurations of the individual QCL assumptions as coefficients. As an example of a coefficient multiplied by each QCL assumption in the weighted sum, there can be an average gain. By applying the degree of contribution of each QCL assumption to the combined QCL assumption in proportion to the received strength of the reference RS used to estimate the corresponding individual QCL assumption, the terminal can 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 with an average delay value = A and an average gain = C, while being connected to a second reference RS with an average delay value = B and an average gain = D at the same time, the combined average delay value is assumed to be (C*A + D*B).

[0563] As another example, in order to control the synthesis of the secondary statistical characteristic values of a channel in a continuously increasing direction (such as delay spread or Doppler spread), a combined QCL assumption can be generated by performing multiplication and addition using the relative magnitudes of the average gains between the reference RSs. According to this example, when the target RS is connected to a first reference RS with an average delay value = A and an average gain = C, while being connected to a second reference RS with an average delay = B and an average gain value = D at the same time, the combined average delay value is assumed to be (C*A + D*B) / (C + D).

[0564] According to this method, one 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 can also be agreed to apply different methods according to the QCL parameter type in the QCL assumption. For example, it can be permitted to determine a variable corresponding to the main 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 parameter), and a variable corresponding to the secondary characteristics of the channel (based on the variance value of a given measurement interval), according to the sum of weights using an integer (such as 1) with the same value as the coefficient in the first example of Method 1. According to the second example of Method 2, the relative magnitudes of the average gains between the reference RSs are used as coefficients, and weights such as delay spread or Doppler spread are determined according to the sum of weights, or an independent higher-layer signaling parameter for configuring this weight is introduced. The higher-layer signaling parameter can directly indicate the method for synthesizing a specific QCL parameter, or can indicate that one of the examples is applied to a pre-configured set of one or more specific QCL parameters.

[0565] Method 3: A third method of generating a new QCL parameter value (a combined QCL assumption) by synthesizing QCL parameter values (individual QCL assumptions) measured or extracted from multiple QCL reference RSs is a method of comparing the QCL parameter values of individual QCL assumptions and selecting a dominant value therefrom for use as the combined QCL assumption. For example, in the secondary statistical characteristic values of a channel (such as delay spread or Doppler spread), the combined parameter value is largely affected by the larger value among the individual values, and thus the present invention may be limited such that, considering the implementation complexity of the terminal and without generating an accurate combined value, the synthesis is performed by selecting the maximum value from the individual QCL parameter measurement values or only selecting the top N values from the individual QCL parameter measurement values. According to this example, when the target RS is connected to a first reference RS with an average delay value = A while being connected to a second reference RS with an average delay value = B, and the condition A > B is satisfied, the combined average delay value is assumed to be A.

[0566] As another example of generating a combined QCL assumption by selecting a dominant value, there is a method of determination according to a direct indication from a base station. For example, in addition to Table 33 or Table 34, the base station is able to indicate information about the RS in which the QCL parameters to be used for the combined QCL assumption are measured to the terminal via higher layer signaling or L1 signaling. As another example of generating a combined QCL assumption by selecting a dominant value, there is a method of determining a reference RS according to independent parameter values, in which the QCL parameters for the synthesis are measured. For example, it may 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 with an average delay value = A and an average gain = C while being connected to a second reference RS with an average delay value = B and an average gain = D, and the condition C > D is satisfied, the combined average delay value is assumed to be A.

[0567] According to this method, a method can be commonly applied to all QCL parameters configured by a base station, such as average delay, delay spread, Doppler frequency shift, Doppler spread, and spatial RX parameters. However, as an application based on this method, it is also possible to agree to apply different methods according to the QCL parameter type in the QCL assumption. For example, it can be permitted that for variables corresponding to the main characteristics of a channel (based on the average or instantaneous value within a given measurement interval), such as average delay, Doppler frequency shift, or spatial RX parameters, use the selected value based on the average gain value according to the second example of Method 3, and for variables corresponding to the secondary characteristics of a channel (based on the variance value within a given measurement interval), such as delay spread or Doppler spread, use the QCL assumption synthesized according to the magnitudes of the QCL parameter values of each reference RS according to the first example of Method 3, or introduce an independent higher layer signaling parameter for configuring this QCL. The higher layer signaling parameter can directly indicate the method for synthesizing 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.

[0568] Method 4: In the descriptions of Methods 1, 2, and 3, although some methods and combinations between embodiments have been mentioned, obviously, the present disclosure is not necessarily limited to the embodiments in actual applications, and various combinations similar thereto can be considered.

[0569] Figure 21 It is a diagram illustrating another example of TCI simulation according to an embodiment of the present invention.

[0570] Figure 21 It is a diagram illustrating a specific example of a second method of two TCI simulation methods, where the second method is a method of performing two or more different TCI states or two or more different QCL assumptions by appropriately dividing one TCI state or one QCL assumption. Refer to Figure 21 , the terminal 2103 can establish an uplink or downlink wireless communication link with one or more transmit and receive 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 the case of, for the sake of explanation, the physical positions of transmission points 2101 and 2102 are shown as different, but the present disclosure need not be limited thereto in practical applications, and some transmission points may have the same physical position. (For example, a terminal may transmit or receive signals through two different transmission points, each transmission point having two panels, in which case some of the four panels may share the same rank or vertical physical position.)

[0571] In this specification, generating a QCL assumption or starting or executing a QCL / TCI process may indicate that a 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 in Table 10 so as to use it for channel estimation via reception of a QCL target RS configured in the corresponding QCL configuration information.

[0572] In this specification, different transmission points for transmitting a specific reference signal or channel may indicate that two different reference signals received by a 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 so as 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 a 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 relation information, etc.) or different UL-TCI states. In practical applications, in order to help a terminal easily determine that the transmission points are different, independent higher layer parameters may be defined and clearly declared. As described above, there may be differences in the terms required for describing the downlink and the uplink, but in order not to obscure the key points of the description, the following description will mainly relate to the downlink. However, it should be noted that the general content of the present disclosure may also be applied to the uplink in a similar manner.

[0573] In order not to obscure the key points of the present disclosure in the following description, it should be noted that there are cases where the cases configured with QCL or TCI states are collectively referred to as "the base station configures a specific QCL or TCI state for the terminal via higher layer signaling", "a specific QCL or TCI state is activated via higher layer signaling or L1 signaling", or "a specific QCL or TCI state is indicated by L1 signaling".

[0574] In the following description, two transmission points are assumed, but this is for the sake of description, and the case where there are three or more transmission points can also be supported in a similar manner.

[0575] Reference Figure 21 , the terminal 2103 can receive and be configured with QCL reference RSs (e.g., SS / PBCH block, TRS, CSI-RS for BM (CSI-RS where the repetition parameter is configured to be turned on or off among CSI-RSs)) 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 specific time / frequency resource 2100, and can generate QCL assumptions or start a TCI process. In this case, the terminal can consider three cases of the target RS reception situation, as Figure 21 shown. The first case is the situation where the terminal 2103 receives and is configured with QCL target RSs (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS, etc.) 2114 and 2115, and the QCL target RSs are transmitted from the first and second transmission points 2101 and 2102 at a specific time point or specific time / frequency resource 2110, where the terminal can receive the target RS by application. In fact, in the resource 2100, the QCL assumption is measured from the QCL reference RS. The second case is the situation where the terminal 2103 receives the QCL target RS (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS) 2121 and is configured with the QCL target RS (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS) 2121 transmitted from the first transmission point 2101 at a specific time point or specific time / frequency resource 2120, where the terminal needs to change and apply the QCL assumption measured from the QCL reference RS in the resource 2100 to obtain the best reception performance. A third case similar to the second case is the situation where the terminal 2103 receives and is configured with the QCL target RS (e.g., PDCCH DMRS, PDSCH DMRS, CSI-RS, etc.) 2131 transmitted from the second transmission point 2102 at a specific time point or specific time / frequency resource 2130, where the terminal needs to change and apply the QCL assumption measured from the QCL reference RS in the resource 2100 to obtain the best reception performance.

[0576] However, for the concurrent transmission situation at the first and second transmission points, this requires transmitting QCL reference RSs different from the QCL reference RSs 2104 and 2105, and thus additionally requires a 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 the concurrent transmission of QCL reference RSs that need to be used in a common cell or common group manner exists.

[0577] To solve this problem, the TCI simulation (QCL segmentation or TCI segmentation, TCI simulation mode #2) can be performed according to one or a combination of the following methods. AsFigure 21 As shown, in order to partition and apply the QCL information measured in a reference RS to multiple target RSs, the base station should be able to correctly notify the terminal of the many-to-one relationship (1:N association) between the reference RS and the target RSs. Based on this, in many cases, the base station and the terminal can appropriately exchange the QCL / TCI information of the QCL target RSs for cooperative transmission without performing concurrent transmission or reception on the QCL reference RSs used in the common cell or common group manner.

[0578] The terminal is capable of measuring two or more pairs of QCL parameter values (e.g., average delay, delay spread, Doppler shift, Doppler spread, spatial RX parameter, average gain, etc.) in one QCL reference RS at a time (simultaneously) according to the indication of the base station. For example, as a result of the measurement, two values can be measured as the 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 for simultaneously transmitting 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, one QCL reference RS includes RS2104 transmitted from the first transmission point 2101 in resource 2100, and RS 2105 transmitted from the second transmission point 2102, where the terminal can perform measurements using two pairs of QCL parameter values (specific QCL parameter values based on RS2104 and specific QCL parameter values based on RS 2105).

[0579] As another example, the terminal is capable of determining whether to implicitly perform TCI simulation (QCL segmentation or TCI segmentation, TCI simulation mode #2) according to specific conditions different from explicit signaling. As an example, the terminal can be configured to determine whether to perform TCI simulation according to 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.

[0580] The base station is capable of instructing the terminal to selectively apply one of the following operations when performing TCI simulation.

[0581] Emulation mode # Operation # 1: When receiving the target RS, the terminal application measures all pairs of QCL parameters simultaneously in a QCL reference RS. This is the operation assuming the case where the target RS is transmitted from multiple transmission points (such as the reference RS) simultaneously. This indicates that when instructing the terminal to perform the operation, the terminal generates QCL assumptions by assuming that a QCL parameter value exists in one QCL parameter without assuming that multiple simultaneously measured QCL parameter values exist in one QCL parameter, or the terminal starts or executes the QCL / TCI process. Refer to Figure 21 , when the target RS is the same as RS 2114 and RS 2115 of resource 2110, the terminal can use a QCL parameter value measured from QCL reference RS 2104 and 2105.

[0582] Emulation mode # Operation # 2: When receiving the target RS, the terminal applies the first set in the pairs of QCL parameters measured simultaneously. This is the operation assuming such a case where the target RS is transmitted only from some of the transmission points (only at the first transmission point) transmitting the reference RS. Refer to Figure 21 , if the target RS is the target RS 2121 transmitted from transmission point 2101, the terminal can generate QCL assumptions by applying the QCL parameters measured based on RS 2104, or can start or execute the QCL / TCI process.

[0583] Emulation mode # Operation # 3: When receiving the target RS, the terminal applies the second set in the pairs of QCL parameters measured simultaneously. This is the operation assuming such a case where the target RS is transmitted only from some of the transmission points (only at the second transmission point) transmitting the reference RS. Refer to Figure 21 , if the target RS is the target RS 2131 transmitted from transmission point 2102, the terminal can generate QCL assumptions by applying the QCL parameters measured based on RS 2105, or can start or execute the QCL / TCI process.

[0584] <Second Embodiment>

[0585] The second embodiment provides a method for reducing the reference signal transmission burden through TCI / QCL emulation. According to this embodiment, the TCI / QCL emulation corresponds to one or more of the following combinations: 1) a method of dividing the measurement time interval (monitoring opportunity) of the target RS 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 the time resources into multiple groups, etc. There may be various detailed methods.

[0586] Figure 22It is a diagram showing an example of TCI simulation via measurement restriction according to an embodiment of the present disclosure.

[0587] Reference 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 may 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 22 's case, for ease of explanation, the physical positions of the transmission points 2201 and 2202 are shown as different, but the present disclosure does not have to be limited to this in actual applications, and some transmission points may have the same physical position. (For example, the terminal can send or receive signals through two different transmission points, each transmission point having two panels, in which case some of the four panels may share the same rank or vertical physical position.)

[0588] In this specification, generating a QCL assumption or starting or executing a QCL / TCI process may indicate that the terminal receives QCL configuration information from the 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 in Table 10 so that it can be used for channel estimation via the reception of the QCL target RS configured in the corresponding QCL configuration information.

[0589] 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, to help the terminal easily determine the difference in transmission points, independent higher-layer parameters can be defined and clearly declared. As described above, there may be differences in the terms required for describing the downlink and uplink, but in order not to obscure the key 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.

[0590] To avoid obscuring the key points of the present disclosure in the following description, it should be noted that there are cases where the cases configured with QCL or TCI states are collectively referred to as "the base station configures specific QCL or TCI states for the terminal via higher layer signaling", "specific QCL or TCI states are activated via higher layer signaling or L1 signaling", or "specific QCL or TCI states are indicated by L1 signaling".

[0591] In the following description, two transmission points are assumed, but this is for ease of description, and the case of three or more transmission points can also be supported in a similar manner.

[0592] Reference Figure 22 , the base station can configure or indicate the terminal 2203 to measure the reference signal in the time-frequency resource. In this case, the time resource for measuring the reference signal may include information indicating periodicity and offset in units of time slots or subframes, and the position information of the OFDM symbols transmitting the reference signal in the time slot. If the terminal needs to use QCL assumptions in various cases (for example, 1) the terminal 2203 receives the reference RS 2204 transmitted from the first transmission point 2201 to generate the QCL assumption 2200, 2) the terminal 2203 receives the reference RS 2211 transmitted from the second transmission point 2202 to generate the QCL assumption 2210. 3) The terminal 2203 simultaneously receives the reference RSs 2221 and 2222 transmitted from the first and second transmission points 2201 and 2202 to generate the QCL assumption 2220, etc.), the base station can divide the time resource for measuring the reference signal defined by the configuration of the foregoing one reference signal, and indicate the terminal to generate different QCL assumptions for each time interval. For ease of description, this is referred to as the "QCL assumption method based on time domain measurement limitation".

[0593] For the "time resource for measuring the reference signal defined by the configuration of one reference signal", various applications are possible. For example, the time resource refers to the time resource according to periodicity and offset configured in the periodic or semi-persistent CSI-RS resource configuration (or information indicating multiple 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). The time resource according to the transmission timing and transmission offset of the triggering DCI of the aperiodic CSI-RS (or the transmission offset can be configured in one aperiodic CSI-RS resource, and the time resources according to each offset may also correspond to each time interval), the time resource defined for each OFDM symbol or each time slot in a subframe or a frame, regardless of the reference signal configuration, etc. In Figure 22In order to facilitate the description, it has been assumed that the "time resources for reference signal measurement defined by a reference signal configuration" are divided into a total of six intervals 2230, 2231, 2232, 2233, 2234, and 2235. The intervals can be divided according to a predetermined rule, such as "every Nth resource within the time resources for reference signal measurement", or they can also be divided according to explicit signaling, such as a bitmap or a resource index.

[0594] In Figure 22 the case of, for the three QCL hypothesis calculation methods 2200, 2210, and 2220, it has been assumed that the units of two intervals out of the six intervals are mapped to (associated with) each QCL hypothesis calculation method. For example, when generating QCL hypotheses according to a reference signal configuration, the terminal 2203 can divide the reference measurement intervals based on a reference signal configuration into three subgroups according to an indication from the base station. The first QCL hypothesis 2200 can be generated in the first subgroup 2230 and 2233, the second QCL hypothesis 2210 can be generated in the second subgroup 2231 and 2234, and the third QCL hypothesis 2220 can be generated in the third subgroup 2232 and 2235. In this case, the terminal may not identify clear information about the number of transmission points, based on which each subgroup generates QCL hypotheses. Instead, when processing the reference signal reception results (such as the average value of noise cancellation, etc.) by the terminal, it can be restricted to not mixing and using the reference signal reception results belonging to different subgroups.

[0595] Figure 23 is a diagram showing an example of TCI simulation via a resource pool according to an embodiment of the present disclosure.

[0596] Referring to Figure 23, the terminal can divide, from all time / frequency resources (e.g., the time-frequency resources included in a downlink (D) time slot that are neither configured nor indicated as flexible (F) or uplink (U)), the part where reference signals measurable for generating QCL assumptions are located into several intervals (e.g., 2300, 2305, 2310, 2315, 2320, and 2325). It can be determined based on higher layer signaling that configures the time resources, and this can be referred to as the resource pool for QCL assumptions. The base station can be configured to implement the execution of the TCI process (e.g., execute the TCI process for TCI#1 in resource pools 2300, 2310, and 2320) or the generation of QCL assumptions by assuming the conventional one-to-one reference RS - target RS relationship in some resource pools, but in other resource pools (e.g., 2305), while 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 QCL assumptions by assuming the multi-to-one-to-many reference RS - target RS relationship proposed in this disclosure. The resource pool configuration information can be sent via higher layer signaling. Wherein the resource pool can be configured by explicit parameters, such as information indicating periodicity and offset, bitmaps, and one or more resource indices, or the resource pool can be implicitly configured.

[0597] In this case, it can be understood that the terminal is instructed to perform TCI simulation in resource pools 2305, 2315, and 2325. As in the example in Figure 22 , this process can be executed by the terminal in the following way: identifying that the QCL assumptions between "resource pools 2300, 2310, and 2320 for performing measurements of the conventional QCL or TCI framework (or including parts or all of the subsequent TCI process)" and "resource pools 2305, 2315, and 2325 for performing TCI simulation (or including parts or all of the subsequent TCI process)" are different from each other. That is to say, in this case, the terminal can 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 identify that the measurement results have different statistical characteristics, so joint processing between resource pools cannot be performed. Or, as in the example of resource pools 305, 2315, and 2325, the base station can indicate to the terminal the QCL assumptions or TCI states that need to be synthesized in each resource pool via direct higher layer signaling or / and L1 signaling. In this case, the higher layer signaling and / or L1 signaling can include the above-mentioned higher layer signaling parameters or downlink control information fields.

[0598] <Third Embodiment>

[0599] The third embodiment provides an operation sequence of a base station and a terminal according to the present disclosure.

[0600] Figure 24 is a diagram showing an operation sequence of a base station and a terminal according to an embodiment of the present disclosure.

[0601] Referring to Figure 24 , in operation 2400, the terminal may perform a terminal capability report that notifies the base station whether it supports part or all of the above TCI simulation method. 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 simulation method supported by the terminal via higher layer signaling based on the terminal capability report, and if necessary, perform activation of a part thereof via MAC CE or L1 signaling. The terminal receives the higher layer signaling and, when sent by the base station, receives activation information via MAC CE or L1 signaling. Then, in operation 2410, the terminal may determine whether to perform TCI simulation and the TCI simulation operation method (or mode) based on some of the information and the above TCI simulation operation conditions.

[0602] If configured not to perform TCI simulation, or if the TCI simulation performance conditions are not met, then in operation 2415, the terminal performs a TCI / QCL process 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 it is configured to perform TCI simulation and meets the performance conditions of TCI simulation mode #1 of Embodiment 1, then the terminal performs a TCI / QCL process by assuming an N:1 relationship between the target RS and the reference RS according to the method in operation 2420. Or, if it is configured to perform TCI simulation and meets the performance conditions of TCI simulation mode #2 of Embodiment 1, then the terminal performs a TCI / QCL process by assuming an N:1 relationship between the target RS and the reference RS according to the method in operation 2425. Or, if it is configured to perform TCI simulation and meets the performance conditions of TCI simulation mode #3 or #4 of Embodiment 2, then the terminal performs a TCI / QCL process by assuming QCL parameter measurement or measurement limit of a resource pool according to the method in operation 2430.

[0603] The above embodiments and methods are not exclusive and may be operated in combination with each other according to circumstances. For example, the terminal may be configured to use TCI simulation mode #1 or #2 of the first embodiment in FR1 and apply TCI simulation mode #3 or #4 of the second embodiment in FR2. Various other applications are possible, but not all possible numbers are listed so as not to obscure the gist of the present disclosure.

[0604] Figure 25It is a block diagram of a terminal according to an embodiment of the present invention.

[0605] Referring to 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 storage unit 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 foregoing embodiments. However, the elements of the terminal 2500 according to the embodiments are not limited to the above examples. According to another embodiment, the terminal 2500 may include more or fewer elements compared to the foregoing elements. In addition, in a specific case, the transceiver 2510, the controller 2520, and the storage unit 2530 may be implemented in the form of a single chip.

[0606] The transceiver 2510 may include a transmitter and a receiver according to another embodiment. The transceiver 2510 may send a signal to a base station or receive a signal from a base station. The signal may include control information and data. To this end, the transceiver 2510 may include: an RF transmitter configured to perform upconversion and amplification of the frequency of the transmitted signal; an RF receiver configured to perform low-noise amplification of the received signal and perform downconversion of the frequency, etc. In addition, the transceiver 2510 may receive a signal through a radio channel, output the signal to the controller 2520, and send the signal output from the controller 2520 through the radio channel.

[0607] The controller 2520 may control a series of processes in which the terminal 2500 may operate according to the above embodiments of the present disclosure. For example, the controller 2520 may execute at least one of the TCI simulation execution methods according to the embodiments of the present disclosure. The storage unit 2530 may store control information or data, such as TCI or QCL configuration information included in the signal acquired by the terminal 2500, and may have an area for storing data required for the control of the controller 2520, data generated during the control of the controller 2520, and the like.

[0608] Figure 26 It is a block diagram of a base station according to an embodiment.

[0609] Refer to Figure 26, the base station 2600 may include a transceiver 2610, a controller 2620, and a memory 2630. The transceiver 2610, the controller 2620, and the storage unit 2630 of the base station 2600 may operate according to a method for effectively transmitting or receiving channels and signals in a 5G communication system, which corresponds to the foregoing embodiments. However, the elements of the base station 2600 according to an embodiment are not limited to the above examples. According to another embodiment, compared with the above elements, the base station 2600 may include more or fewer elements. In addition, in a specific case, the transceiver 2610, the controller 2620, and the storage unit 2630 may be implemented in the form of a single chip. The transceiver 2610 may include a transmitter and a receiver according to another embodiment. The transceiver 2610 may send a signal to the terminal or receive a signal from the terminal. The signal may include control information and data. To this end, the transceiver 2610 may include: an RF transmitter configured to perform up-conversion and amplification of the frequency of the transmitted signal; an RF receiver configured to perform low-noise amplification of the received signal and perform down-conversion of the frequency, etc. In addition, the transceiver 2610 may receive a signal through a radio channel, output the signal to the controller 2620, and send the signal output from the controller 2620 through the radio channel.

[0610] The controller 2620 may control a series of processes such that the base station 2600 may operate according to the above 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.

[0611] The storage unit 2630 may 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 may have an area for storing data required for the control of the controller 2620 and data generated during the control of the controller 2620.

[0612] The embodiments of the present disclosure described and illustrated in the specification and the drawings are merely specific examples that 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 idea of the present disclosure can be implemented. In addition, the above various embodiments may be used in combination as needed.

Claims

1. A method performed by a terminal of a wireless communication system, the method comprising: Receive high-layer signaling from a base station, the high-layer signaling including configuration information associated with a Transmission Configuration Indicator (TCI) state; Determine whether information related to TCI simulation is included in the high-layer signaling, where the information related to the TCI simulation indicates that the Quasi-Co-Location (QCL) assumption for downlink data is based on two TCI states; Receive downlink control information (DCI) from the base station for scheduling the downlink data, the DCI including TCI information corresponding to the two TCI states and DMRS configuration information indicating one or more Demodulation Reference Signal (DMRS) ports for the downlink data; and Receive the downlink data by using the DMRS in the one or more DMRS ports; where, when the information related to the TCI simulation is included in the high-layer signaling, the DMRS in the one or more DMRS ports is assumed to be quasi-co-located with the reference signals associated with the two TCI states.

2. The method according to claim 1, wherein, When the information related to the TCI simulation is not included in the high-layer signaling, a first TCI state is associated with a first DMRS of a first DMRS Code Division Multiplexing (CDM) group, and a second TCI state is associated with a second DMRS of a second DMRS CDM group.

3. The method according to claim 1, further comprising: Receive a Medium Access Control (MAC) Control Element (CE) from the base station, the MAC CE indicating the two TCI states of the TCI information in the DCI.

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

5. The method according to claim 1, wherein, The information related to the TCI simulation is associated with the QCL parameters for applying the TCI simulation.

6. A method performed by a base station of a wireless communication system, the method comprising: Send high-layer signaling including configuration information associated with a Transmission Configuration Indicator (TCI) state to a terminal; Send downlink control information (DCI) for scheduling downlink data to the terminal, the DCI including TCI information corresponding to two TCI states and DMRS configuration information indicating one or more Demodulation Reference Signal (DMRS) ports for the downlink data; and Send the downlink data to the terminal by using the DMRS in the one or more DMRS ports; where, when the information related to TCI simulation is included in the high-layer signaling, the DMRS in the one or more DMRS ports is assumed to be quasi-co-located with the reference signals associated with the two TCI states, and the information related to the TCI simulation indicates that the Quasi-Co-Location (QCL) assumption for the downlink data is based on two TCI states.

7. The method according to claim 6, wherein, When the information related to the TCI simulation is not included in the high-layer signaling, a first TCI state is associated with a first DMRS of a first DMRS Code Division Multiplexing (CDM) group, and a second TCI state is associated with a second DMRS of a second DMRS CDM group.

8. The method according to claim 6, further comprising: Send a Medium Access Control (MAC) Control Element (CE) to the terminal, the MAC CE indicating the two TCI states of the TCI information in the DCI.

9. The method according to claim 6, further comprising: Receive capability information from the terminal, the capability information indicating whether the TCI simulation is supported.

10. The method according to claim 6, wherein, The information related to the TCI simulation is associated with the quasi co-location parameter for applying the TCI simulation.

11. A terminal in a wireless communication system, the terminal comprising: Transceiver; And A controller coupled to the transceiver and configured to: Receive high-layer signaling from a base station, the high-layer signaling including configuration information associated with a transmission configuration indication (TCI) state; Determine whether information related to the TCI simulation is included in the high-layer signaling, where the information related to the TCI simulation indicates that the quasi co-location (QCL) assumption for downlink data is based on two TCI states; Receive downlink control information (DCI) from the base station scheduling the downlink data, the DCI including TCI information corresponding to the two TCI states and DMRS configuration information indicating one or more demodulation reference signal (DMRS) ports for the downlink data; and Receive the downlink data by using the DMRS in the one or more DMRS ports, where, in a case where the information related to the TCI simulation is included in the high-layer signaling, the DMRS in the one or more DMRS ports is assumed to be quasi co-located with the reference signal associated with the two TCI states.

12. The terminal according to claim 11, wherein, In a case where the information related to the TCI simulation is not included in the high-layer signaling, a first TCI state is associated with a first DMRS of a first DMRS code division multiplexing (CDM) group, and a second TCI state is associated with a second DMRS of a second DMRS CDM group.

13. The terminal according to claim 11, wherein, The controller is further configured to: receive a media access control (MAC) control element (CE) from the base station, the MAC CE indicating the two TCI states of the TCI information in the DCI.

14. The terminal according to claim 11, wherein, The controller is further configured to: send capability information to the base station, the capability information indicating whether the TCI simulation is supported.

15. The terminal according to claim 11, wherein, The information related to the TCI simulation is associated with the quasi co-location parameter for applying the TCI simulation.

16. A base station in a wireless communication system, the base station comprising: Transceiver; And A controller coupled to the transceiver and configured to: Send high-layer signaling including configuration information associated with a transmission configuration indication (TCI) state to a terminal; Send downlink control information (DCI) scheduling downlink data to the terminal, the DCI including TCI information corresponding to two TCI states and DMRS configuration information indicating one or more demodulation reference signal (DMRS) ports for the downlink data; And Send the downlink data to the terminal by using the DMRS in the one or more DMRS ports, where, in a case where the information related to the TCI simulation is included in the high-layer signaling, the DMRS in the one or more DMRS ports is assumed to be quasi co-located with the reference signal associated with the two TCI states, where the information related to the TCI simulation indicates that the quasi co-location (QCL) assumption for the downlink data is based on two TCI states.

17. The base station according to claim 16, wherein, In the case where the information related to the TCI simulation is not included in the high-layer signaling, the first TCI state is associated with the first DMRS of the first DMRS code division multiplexing (CDM) group, and the second TCI state is associated with the second DMRS of the second DMRS CDM group.

18. The base station according to claim 16, wherein, The controller is further configured to: send a media access control (MAC) control element (CE) to the terminal, and the MAC CE indicates the two TCI states of the TCI information in the DCI.

19. The base station according to claim 16, the controller is further configured to: Receive capability information from the terminal, the capability information indicating whether the TCI simulation is supported.

20. The base station according to claim 16, wherein, The information related to the TCI simulation is associated with the quasi co-location parameter to which the TCI simulation is applied.

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