Channel estimation method and device for single carrier system based on OFDM

Abstract

The present disclosure relates to a communication technology and system thereof that integrates a 5G communication system supporting a higher data rate after a fourth generation (4G) system with an Internet of Things (IoT) technology. The present disclosure can be applied to smart services based on the fifth generation (5G) communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.). In addition, the present disclosure provides a method and apparatus for reducing power consumption of a user equipment (UE) in a wireless communication system.

Description

Technical Field

[0001] The present disclosure relates to a channel estimation method and apparatus for an OFDM-based single carrier system. Background Art

[0002] In order to meet the increasing demand for wireless data services since the deployment of the fourth generation (4G) communication system, efforts have been made to develop an improved fifth generation (5G) or quasi-5G communication system. 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-long term evolution LTE systems". Therefore, 5G communication systems are considered to be implemented in higher frequency millimeter wave (mmWave) bands (e.g., 60GHz bands) to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large antenna technologies in 5G communication systems are discussed. In addition, in 5G communication systems, development of system network improvements based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multipoint (CoMP), receiving-end interference elimination, etc. is underway. In 5G systems, hybrid frequency shift keying FSK and quadrature amplitude modulation (QAM) frequency quadrature modulation (FQAM) and sliding window superposition coding (SWSC) have been developed 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.

[0003] The Internet is a human-centered connectivity network where humans generate and consume information, and is now evolving into the Internet of Things (IoT), where distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE), which combines IoT technology and big data processing technology through connection with cloud servers, has come into being. In order to realize IoT, technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" are required, and sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), etc. have been studied recently. This IoT environment can provide smart Internet technology services that create new value for human life by collecting and analyzing data generated between connected things. Through the integration and combination between existing information technology (IT) and various industrial applications, IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances, and advanced medical services.

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

[0005] The above information is provided as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art related to the present disclosure. Summary of the invention

[0006] [Technical issues]

[0007] Aspects of the present disclosure will at least solve the above problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a channel estimation method and apparatus capable of processing in the time domain.

[0008] [Technical solution]

[0009] According to one aspect of the present disclosure, a method performed by a terminal is provided. The method includes: receiving information related to a first channel state information (CSI) resource corresponding to a first frequency band and information related to a second CSI resource corresponding to a second frequency band from a base station; receiving a CSI-related signal from the base station on the first CSI resource corresponding to the first frequency band; obtaining at least one of the CSI of the first frequency band or the CSI of the second frequency band based on the CSI-related signal received on the first CSI resource; and sending at least one of the CSI of the first frequency band or the CSI of the second frequency band to the base station.

[0010] According to another aspect of the present disclosure, a method performed by a base station is provided. The method includes: sending information related to a first CSI resource corresponding to a first frequency band and information related to a second CSI resource corresponding to a second frequency band to a terminal; sending a CSI-related signal to the terminal on the first CSI resource corresponding to the first frequency band; and receiving at least one of the CSI of the first frequency band or the CSI of the second frequency band from the terminal, wherein at least one of the CSI of the first frequency band or the CSI of the second frequency band is obtained based on the CSI-related signal sent on the first CSI resource.

[0011] According to another aspect of the present disclosure, a terminal is provided. The terminal includes a transceiver and at least one processor. The processor is configured to: receive information related to a first CSI resource corresponding to a first frequency band and information related to a second CSI resource corresponding to a second frequency band from a base station; receive a CSI-related signal from the base station on the first CSI resource corresponding to the first frequency band; obtain at least one of the CSI of the first frequency band or the CSI of the second frequency band based on the CSI-related signal received on the first CSI resource; and send at least one of the CSI of the first frequency band or the CSI of the second frequency band to the base station.

[0012] According to another aspect of the present disclosure, a base station is provided. The base station includes a transceiver and at least one processor. The processor is configured to: send information related to a first CSI resource corresponding to a first frequency band and information related to a second CSI resource corresponding to a second frequency band to a terminal; send a CSI-related signal to the terminal on the first CSI resource corresponding to the first frequency band; and receive at least one of the CSI of the first frequency band or the CSI of the second frequency band from the terminal, wherein at least one of the CSI of the first frequency band or the CSI of the second frequency band is obtained based on the CSI-related signal sent on the first CSI resource.

[0013] Other aspects, advantages and salient features of the present disclosure will become apparent to those skilled in the art through the following detailed description of various embodiments of the present disclosure in conjunction with the accompanying drawings.

[0014] [Beneficial Effects of the Invention]

[0015] An aspect of the present disclosure is to provide a channel estimation method that can be performed by processing in a time domain without a Fast Fourier Transform (FFT) operation.

[0016] Another aspect of the present disclosure is to provide a method of estimating a channel of an entire frequency band using a channel state information reference signal (CSI-RS) transmitted through a partial frequency band of the entire frequency band.

[0017] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0019] Figure 11 is a diagram showing a basic structure of a time-frequency domain according to an embodiment of the present disclosure, where the time-frequency domain is a radio resource domain for transmitting data or a control channel in a 5G system;

[0020] Figure 2 is a diagram showing the structure of a frame, a subframe, and a time slot in a 5G system according to an embodiment of the present disclosure;

[0021] Figure 3 is a diagram showing a configuration of a bandwidth section in a wireless communication system according to an embodiment of the present disclosure;

[0022] Figure 4 is a diagram illustrating a method of changing a dynamic configuration of a bandwidth portion according to an embodiment of the present disclosure;

[0023] Figure 5 is a diagram showing a control resource set (CORESET) for transmitting a downlink control channel in a 5G system according to an embodiment of the present disclosure;

[0024] Figure 6 is a diagram showing a signal processing process of a transceiver supporting only time processing according to an embodiment of the present disclosure;

[0025] Fig. 7A is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure;

[0026] Figure 7B is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure;

[0027] Figure 7C is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure;

[0028] Fig.7D is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure;

[0029] Figure 8 is a flow chart showing a channel estimation operation performed by a user equipment (UE) according to an embodiment of the present disclosure;

[0030] Fig. 9 is a flowchart illustrating the operation of a UE according to an embodiment of the present disclosure;

[0031] Fig.10 is a flowchart illustrating the operation of a base station according to an embodiment of the present disclosure;

[0032] Fig.11 is a block diagram showing the structure of a UE according to an embodiment of the present disclosure; and

[0033] Fig.12 is a block diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0034] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0035] The following description is provided with reference to the accompanying drawings to assist in a thorough understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. The following description includes various specific details that are helpful for understanding, but these details should be considered as exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0036] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the present disclosure as defined by the appended claims and their equivalents.

[0037] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0038] In the process of describing the embodiments of the present disclosure, descriptions related to technical contents well known in the art and not directly related to the present disclosure will be omitted. Omission of unnecessary descriptions is to prevent confusion of the main idea of ​​the present disclosure and to convey the main idea more clearly.

[0039] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect its actual size. In the accompanying drawings, the same or corresponding elements have the same reference numerals.

[0040] By referring to the embodiments described below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and their implementation will be more apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and 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 attached claims. Throughout the entire specification, the same or similar reference numerals represent the same or similar elements.

[0041] Here, it should be understood that each frame shown in the flowchart and the frame combination shown in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in one or more flowchart frames. These computer program instructions can also be stored in a computer-usable or computer-readable memory, and the memory can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce a product including an instruction device that implements the specified functions in one or more flowchart frames. The computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operations to be performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide operations for implementing the functions specified in one or more flowchart frames.

[0042] In addition, each block of the flowchart diagram may represent a module, a code segment or a code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative embodiments, the functions described in the blocks may not occur in order. For example, depending on the functionality involved, two blocks shown in succession may actually be executed approximately simultaneously, or the blocks may sometimes be executed in reverse order.

[0043] As used herein, "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, "unit" does not always have a meaning limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to be constructed to perform one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, programs, subroutines, program code fragments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into fewer elements or "units", or divided into more elements or "units". In addition, elements and "units" can be implemented as one or more CPUs in a reproduction device or a secure multimedia card.

[0044] Hereinafter, the operating principle of the present disclosure will be described in conjunction with the accompanying drawings. In the following description of the present disclosure, when the detailed description of the known functions or configurations combined makes the subject matter of the present disclosure quite unclear, the detailed description will be omitted herein. The terms to be described below are terms defined based on the functions in the present disclosure, and may be different according to the user, the user's intention or habit. Therefore, the definition of the terms should be determined based on the content throughout the entire specification. In the following description, a base station is an entity that allocates resources to a terminal, and may be at least one of a gNode B, a gNode B, a node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, examples of base stations and terminals are not limited thereto. Hereinafter, in the present disclosure, a description of a technology for receiving broadcast information from a base station by a terminal in a wireless communication system will be given. The present disclosure relates to a technology and a system for integrating Internet of Things (IoT) technology with a fifth generation (5G) communication system for supporting a higher data transfer rate than a fourth generation (4G) system. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, safety and security-related services, etc.).

[0045] In the following description, for the sake of convenience, terms referring to broadcast information, terms referring to control information, terms associated with communication coverage, terms referring to state changes (e.g., events), terms referring to network entities, terms referring to messages, terms referring to device elements, etc. are exemplarily used. Therefore, the present disclosure is not limited to the terms used below, and other terms referring to subjects having equivalent technical meanings may be used.

[0046] In the following description, for ease of description, the present disclosure will be described using the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard, the latest existing communication standard. However, the present disclosure is not limited to these terms and names, and can also be applied to systems that conform to other standards.

[0047] In addition to voice-based services provided in the initial stage, wireless communication systems have evolved into broadband wireless communication systems that provide high-speed and high-quality packet data services, such as communication standards such as High Speed ​​Packet Access (HSPA) of 3GPP, Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), Advanced LTE (LTE-A), High Rate Packet Data (HRPD) of 3GPP2, Ultra Mobile Broadband (UMB) and 802.16e of the Institute of Electrical and Electronics Engineers (IEEE), etc.

[0048] As a representative example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme for the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) scheme for the uplink (UL). The uplink refers to a wireless link via which a user equipment (UE) or a mobile station (MS) sends data or a control signal to an eNB (eNode B or base station). The downlink refers to a wireless link via which an eNB sends data or a control signal to a UE. In the multiple access scheme as described above, time-frequency resources for carrying data or control information are allocated and operated in a manner to prevent resource overlap, that is, to establish orthogonality between users, thereby identifying the data or control information of each user.

[0049] The future communication system after LTE, namely the 5G communication system, needs to freely apply various requirements from users, service providers, etc., and therefore needs to support services that meet various requirements in parallel. Services considered for the 5G communication system may include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), etc.

[0050] According to an embodiment of the present disclosure, eMBB is intended to provide a higher data transmission rate than that supported by conventional LTE, LTE-A or LTE-pro. For example, in a 5G communication system, from the perspective of a single eNB, eMBB needs to provide a maximum transmission rate (peak data rate) of 20 Gbps per second in the downlink and a maximum transmission rate (peak data rate) of 10 Gbps in the uplink. In addition, the 5G communication system needs to provide an enhanced UE user-perceived data rate while providing a maximum transmission rate. In order to meet these requirements, it is expected to improve the transmission / reception technology, including advanced multiple-input multiple-output (MIMO) transmission technology. In addition, the 5G communication system uses a frequency bandwidth wider than 20 MHz in a frequency band of 3 GHz to 6 GHz or 6 GHz or higher, and in a frequency band greater than or equal to 6 GHz, and therefore, the data transmission rate required by the 5G communication system can be met.

[0051] In addition, the 5G communication system considers mMTC in order to support application services such as the Internet of Things (IoT). mMTC needs to support the access of a large number of UEs in a cell, improve the coverage of UEs, improve battery life, reduce the cost of UEs, etc. to effectively provide IoT. The Internet of Things provides communication functions by attaching to various sensors and various devices, so it is necessary to support a large number of UEs (for example, 1,000,000 UEs / km) in a cell. 2). In addition, in terms of the characteristics of the service, the UE supporting mMTC is likely to be located in a shadow area that cannot be covered by the cell, such as the basement of a building, and may require a wider coverage than other services of the 5G communication system. The UE supporting mMTC needs to be manufactured as a low-cost UE, and the battery of the UE will not be replaced frequently. Therefore, a longer battery life may be required.

[0052] Finally, URLLC is a cellular-based wireless communication service for mission-critical communications. For example, URLLC may include remote control services for robots or machinery, industrial automation services, unmanned aerial vehicle services, remote healthcare services, emergency alert services, etc. Therefore, the communications provided by URLLC may need to provide very low latency and very high reliability. For example, services supporting URLLC need to meet an air interface latency of less than 0.5 milliseconds and at the same time need to meet a reliability of less than or equal to 10 -5 Therefore, for services supporting URLLC, the 5G system needs to provide a smaller transmission time interval (TTI) than other services, and at the same time needs to allocate wider resources on the frequency band. However, the above-mentioned mMTC, URLLC and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-mentioned examples.

[0053] In the above 5G communication system, the services considered should be provided by integrating with each other based on a framework. For example, for efficient resource management and control, it is better to integrate each service into one system for control and transmission rather than operating independently.

[0054] In addition, the following uses LTE, LTE-A, LTE Pro or NR systems as examples to describe the embodiments of the present disclosure, but the embodiments of the present disclosure can be applied to other communication systems with similar technical backgrounds or channel types. In addition, as determined by ordinary technicians with familiar technical knowledge in the field, the embodiments of the present disclosure can be applied to other communication systems with some modifications without obviously departing from the scope of the present disclosure.

[0055] The present disclosure relates to a method and apparatus for transmitting data and control signals between a plurality of transmission nodes performing cooperative communication and a UE to improve communication reliability.

[0056] According to an embodiment of the present disclosure, when network cooperative communication is used in a wireless communication system, the UE can improve the reliability of the data / control signal sent or received by repeated transmission between transmission points. Alternatively, the UE can improve the transmission capacity of the data / control signal sent or received by separate (independent) transmission for each transmission point.

[0057] Hereinafter, the frame structure of the 5G system will be described with reference to the accompanying drawings.

[0058] Figure 1 2 is a diagram showing a basic structure of a time-frequency domain according to an embodiment of the present disclosure, where the time-frequency domain is a radio resource domain for sending data or a control channel in a 5G system.

[0059] like Figure 1 The structure in the time-frequency domain shown can be applied to LTE, LTE-A, NR or similar wireless communication systems.

[0060] refer to Figure 1 In the structure of subframe 1-10, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of the time domain and the frequency domain is a resource element (RE) 1-01, and can be defined as one orthogonal frequency division multiplexing (OFDM) symbol 1-02 in the time domain and one subcarrier 1-03 in the frequency domain. In the frequency domain, (For example, 12) consecutive REs may constitute one resource block (RB) 1-04.

[0061] Figure 2 is a diagram showing the structure of frames, subframes, and time slots in a 5G system according to an embodiment of the present disclosure.

[0062] refer to Figure 2 , shows an example of the structure of a frame 2-00, a subframe 2-01, and a time slot 2-02. One frame 2-00 may be defined as 10 ms. One subframe 2-01 may be defined as 1 ms, and one frame 2-00 may consist of a total of 10 subframes 2-01. One time slot 2-02 or 2-03 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot ). One subframe 2-01 may consist of one or more time slots 2-02 or 2-03, and the number of time slots 2-02 or 2-03 of each subframe 2-01 may vary according to the configuration value μ2-04 or 2-05 for the subcarrier spacing.

[0063] exist Figure 2 In the example of FIG. 1 , the case where the subcarrier spacing configuration value is μ=0 (2-04) and the case where μ=1 (2-05) is shown. When μ=0 (2-04), one subframe 2-01 may consist of one time slot 2-02; and when μ=1 (2-05), one subframe 2-01 may consist of two time slots 2-03. For example, the number of time slots per subframe is The number of time slots per frame can vary according to the configured value μ of the subcarrier spacing. Variable. Configure μ according to each subcarrier spacing, and It can be defined as shown in Table 1 below.

[0064] [Table 1]

[0065]

[0066] In NR, a component carrier (CC) or serving cell can consist of up to 250 or more RBs. Therefore, when the UE always receives the entire serving cell bandwidth as in LTE, the power consumption of the UE will be very large. To solve this problem, the base station can configure one or more bandwidth parts (BWPs) for the UE to support the UE so that the UE can change the reception domain within the cell.

[0067] In NR, the base station can configure the "initial BWP" for the UE through the MIB, that is, the bandwidth of CORESET#0 (or common search space {CSS}). Then, the base station can configure the initial BWP (first BWP) of the UE through radio resource control (RRC) signaling, and in the future, at least one or more indicative BWP configuration information can be notified through downlink control information (DCI). Thereafter, the base station can indicate which frequency band the UE will use by notifying the BWP ID through DCI. If the UE does not receive DCI in the currently allocated BWP for more than a certain time, the UE returns to the "default BWP" and attempts to receive DCI.

[0068] Figure 3 is a diagram showing a configuration of a bandwidth part in a wireless communication system according to an embodiment of the present disclosure.

[0069] refer to Figure 3 , UE bandwidth 3-00 may include two bandwidth parts, namely bandwidth part #1 (3-05) and bandwidth part #2 (3-10). The base station may configure one or more bandwidth parts for the UE, and may configure each bandwidth part with information as shown in Table 2 below.

[0070] [Table 2]

[0071]

[0072] In addition to the configuration information described in Table 2, various parameters related to the bandwidth part may be configured for the UE. The above information may be sent from the base station to the UE via high-layer signaling (e.g., RRC signaling). At least one of the configured one or more bandwidth parts may be activated. Whether the configured bandwidth part is activated may be sent from the base station to the UE in a semi-static manner via RRC signaling, or may be sent dynamically via a MAC control element (CE) or DCI.

[0073] The configuration of the bandwidth portion supported by the above-mentioned 5G communication system can be used for various purposes.

[0074] For example, when the bandwidth supported by the UE is less than the system bandwidth, the bandwidth supported by the UE can be supported by configuring the bandwidth part. For example, in Table 2, the frequency position of the bandwidth part is configured for the UE (configuration information 2), so that the UE can send and receive data at a specific frequency position within the system bandwidth.

[0075] As another example, in order to support different parameter sets, the base station may configure multiple bandwidth parts for the UE. For example, in order to support data transmission and reception using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to any UE, two bandwidth parts may be configured to use subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed (FDM), and when data is transmitted / received at a specific subcarrier spacing, the bandwidth part configured at the corresponding subcarrier spacing may be activated.

[0076] As another example, in order to reduce UE power consumption, the base station may configure bandwidth parts with different bandwidth sizes for the UE. For example, if the UE supports a very large bandwidth such as 100 MHz, and always sends / receives data through the corresponding bandwidth, it will cause very large power consumption. More specifically, the UE performs unnecessary monitoring of the downlink control channel of the large bandwidth of 100 MHz in the absence of traffic, which is very inefficient in terms of power consumption. Therefore, in order to reduce UE power consumption, the base station may configure a bandwidth part with a relatively smaller bandwidth for the UE, such as a bandwidth part of 20 MHz. In the absence of traffic, the UE can perform monitoring operations in the 20 MHz bandwidth part, and when generating data, it can use the 100 MHz bandwidth part to send and receive data according to the instructions of the base station.

[0077] Figure 4 is a diagram illustrating a method of changing a dynamic configuration of a bandwidth portion according to an embodiment of the present disclosure.

[0078] refer to Figure 4 As described in Table 2 above, the base station may configure one or more bandwidth parts for the UE. By configuring each bandwidth part, the UE may be informed of information about the bandwidth of the bandwidth part, the frequency position of the bandwidth part, and the parameter set of the bandwidth part. Figure 4 As shown, two bandwidth parts within the UE bandwidth 4-00, namely bandwidth part #1 (BPW#1) (4-05) and bandwidth part #2 (BWP#2) (4-10) can be configured for the UE. One or more bandwidth parts in the configured bandwidth can be activated and Figure 4In the example in which a bandwidth part is activated, an example can be considered. In time slot #0 (4-25), bandwidth part #1 (4-02) among the configured bandwidth parts is activated, and the UE can monitor the physical downlink control channel (PDCCH) in the control resource set (CORESET) #1 (4-45) and CORESET #2 (4-50) configured in bandwidth part #1 (4-05), and can send and receive data 4-55 in bandwidth part #1 (4-05). The CORESET at which the UE receives the PDCCH may be different depending on which of the configured bandwidth parts is activated, and thus the bandwidth at which the UE monitors the PDCCH may vary.

[0079] The base station may also send an indicator for switching the configuration of the bandwidth part to the UE. Here, switching the configuration of the bandwidth part may be considered to be the same as the operation of activating a specific bandwidth part (e.g., activating switching from bandwidth part A to bandwidth part B). The base station may send a configuration switching indicator (indication) to the UE in a specific time slot. The UE may determine the bandwidth part to be activated by applying the switched configuration according to the configuration switching indicator from the specific point in time after receiving the configuration switching indicator from the base station. In addition, the UE may monitor the PDCCH in the CORESET configured in the activated bandwidth part.

[0080] refer to Figure 4 , the base station may send a configuration switching indicator 4-15 to the UE at time slot #1 (4-30), which instructs the UE to switch the activated bandwidth part from the existing bandwidth part #1 (4-05) to bandwidth part #2 (4-10). After receiving the corresponding indicator, the UE may activate bandwidth part #2 (4-10) according to the content of the indicator. In this case, a transition time 4-20 for switching the bandwidth part may be required so that the time point of switching and applying the activated bandwidth part can be determined. Figure 4 , a case where a transition time 4-20 of one time slot is required after receiving the configuration switching indicator 4-15 is shown. In 4-60, data transmission / reception may not be performed during the transition time 4-20. Therefore, bandwidth part #2 (4-10) is activated in time slot #2 (4-35) and time slot #3 (4-40), so that control channels and data can be transmitted and received through the corresponding bandwidth part.

[0081] The base station may configure one or more bandwidth parts for the UE in advance through high-level signaling (e.g., RRC signaling), and the configuration switching indicator 4-15 may indicate activation in a manner that the base station maps one of the configurations of the previously configured bandwidth parts. 2The N-bit indicator can select and indicate one of the N previously configured bandwidth parts. In the following Table 3, an example of indicating the configuration information of the bandwidth part using a 2-bit indicator is described.

[0082] [Table 3]

[0083] Indicator value Bandwidth Part Configuration 00 Bandwidth configuration configured through high-level signaling A 01 Bandwidth configuration B configured through high-level signaling 10 Bandwidth configuration configured through high-level signaling C 11 Bandwidth configuration configured through high-level signaling D

[0084] exist Figure 4 The configuration switching indicator 4-15 for the bandwidth part described in can be sent from the base station to the UE in the form of medium access control (MAC) control element (CE) signaling or L1 signaling (eg, common DCI, group-common DCI, or UE-specific DCI).

[0085] According to Figure 4 The configuration switching indicator 4-15 for the bandwidth part described in the specification, the time point of applying the bandwidth part activation may depend on the following: the time point from which the configuration switching is applied depends on a predefined value (for example, applied from N (≥1) time slots after receiving the configuration switching indicator); the time point from which the configuration switching is applied is configured from the base station to the UE through high-layer signaling (for example, RRC signaling); or the time point from which the configuration switching is applied may be partially included in the content of the configuration switching indicator 4-15 and sent. Alternatively, the time point of applying the configuration switching may be determined by a combination of the above methods. After receiving the configuration switching indicator 4-15 for the bandwidth part, the UE may apply the switched configuration from the time point obtained by the above method.

[0086] Figure 5 2. It is a diagram showing a control resource set (CORESET) for sending a downlink control channel in a 5G system according to an embodiment of the present disclosure.

[0087] refer to Figure 5 In an embodiment of the present disclosure, a bandwidth part 5-10 of a UE may be configured on the frequency axis, and two control resource sets (control resource set #1 (5-01) and control resource set #2 (5-02)) may be configured within a time slot 5-20 on the time domain. On the frequency axis, control resource sets 5-01 and 5-02 may be configured in a specific frequency resource 5-03 within the entire UE bandwidth part 5-10. In the time domain, control resource sets 5-01 and 5-02 may be configured as one or more OFDM symbols and may be defined as a control resource set duration 5-04. Figure 5 In the example of , control resource set #1 (5-01) is configured as a control resource set duration of two symbols, and control resource set #2 (5-02) is configured as a control resource set duration of one symbol.

[0088] The control resource set in the above-mentioned 5G system can be configured for the UE by the base station through high-level signaling (e.g., system information, master information block (MIB), radio resource control (RRC) signaling). Configuring the control resource set for the UE means providing the UE with information such as a control resource set identifier, a frequency position of the control resource set, and a symbol length of the control resource set. For example, the information for configuring the control resource set for the UE may include information according to Table 4.

[0089] [Table 4]

[0090]

[0091] In Table 4, the tci-StatesPDCCH (abbreviated as "TCI state") configuration information may include the following information: such as one or more synchronization signal (SS) / physical broadcast channel (PBCH) block (abbreviated as "SSB" or "SS / PBCH block") indices that have a quasi-co-site (QCL) relationship with the demodulation reference signal (DMRS) sent in the corresponding control resource set, or a channel state information reference signal (CSI-RS) index.

[0092] In a wireless communication system, one or more different antenna ports (or may be replaced by one or more channels, signals and combinations thereof, but for the convenience of description in the present disclosure, collectively referred to as different antenna ports) may be associated with each other through the following QCL configuration.

[0093]

[0094] Specifically, the QCL configuration may connect two different antenna ports in a relationship between a (QCL) target antenna port and a (QCL) reference antenna port. The UE may apply (or assume) all or part of the channel statistical characteristics measured in the reference antenna port (e.g., large-scale parameters of the channel, such as Doppler shift, Doppler spread, average delay, delay spread, average gain, spatial Rx{or Tx} parameters, and the UE's receive spatial filter coefficients or transmit spatial filter coefficients) when receiving the target antenna port. In the above, the target antenna port refers to an antenna port for sending a channel or signal configured by a high-level configuration including the QCL configuration, or an antenna port for sending a channel or signal to which a TCI state indicating the QCL configuration is applied. In the above, the reference antenna port refers to an antenna port for sending a channel or signal indicated (specified) by the referenceSignal parameter in the QCL configuration.

[0095] Specifically, channel statistical characteristics defined by the QCL configuration (indicated by the parameter QCL-Type in the QCL configuration) can be classified according to the QCL type as follows.

[0096] “QCL-Type A”: {Doppler shift, Doppler spread, average delay, delay spread}

[0097] “QCL-Type B”: {Doppler shift, Doppler spread}

[0098] “QCL-Type C”: {Doppler shift, average delay}

[0099] “QCL-Type D”: {Spatial Rx parameters}

[0100] In this case, the types of QCL types are not limited to the above four, but in order not to confuse the subject of explanation, not all possible combinations are listed. In the above, QCL-Type A is a QCL type used when all statistical features that can be measured in the frequency domain and time domain are available for reference (i.e., when the number of samples and transmission band / time of the target antenna port in both the frequency domain and the time domain are greater than the number of samples and transmission band / time of the reference antenna port), because at this time, the bandwidth and transmission interval of the target antenna port are sufficient compared to the reference antenna port. QCL-Type B is a QCL type used when the bandwidth of the target antenna port is sufficient to measure statistical features that can be measured in the frequency axis (i.e., Doppler shift and Doppler spread, etc.). QCL-Type C is a QCL type used when the bandwidth and transmission interval of the target antenna port are insufficient to measure second-order statistics (i.e., Doppler spread and delay spread), so only first-order statistics (i.e., only Doppler shift and average delay) can be referenced. QCL-TypeD is a QCL type configured when the spatial reception filter value used when receiving the reference antenna port can be used when receiving the target antenna port.

[0101] At the same time, the base station can configure or indicate up to two QCL configurations in one target antenna port through the following TCI state configuration.

[0102]

[0103] In the two QCL configurations included in one TCI state configuration, the first QCL configuration can be configured as one of QCL-Type A, QCL-Type B, and QCL-Type C. At this time, the configurable QCL type is specified according to the types of the target antenna port and the reference antenna port, which will be described below. In addition, in the two QCL configurations included in one TCI state configuration, the second QCL configuration can be configured as QCL-Type D, and can be omitted in some cases.

[0104] The following Tables 4-1 to 4-5 show valid TCI state configurations according to the target antenna port type.

[0105] Table 4-1 shows the valid TCI state configuration when the target antenna port is a CSI-RS (TRS) for tracking. TRS refers to an NZP CSI-RS where no repetition parameter is configured between CSI-RSs and trs-info is configured as true. Configuration 3 in Table 4-1 can be used for aperiodic TRS.

[0106] Table 4-1 Valid TCI state configuration when the target antenna port is CSI-RS (TRS) for tracking

[0107]

[0108] Table 4-2 shows a valid TCI state configuration when the target antenna port is a CSI-RS for CSI. The CSI-RS for CSI refers to an NZP CSI-RS in which a repetition parameter is not configured between CSI-RSs and trs-info is not configured as true.

[0109] Table 4-2 Valid TCI state configuration when the target antenna port is CSI-RS for CSI

[0110]

[0111] Table 4-3 shows the valid TCI state configuration when the target antenna port is a CSI-RS for beam management (same meaning as BM, CSI-RS for L1 RSRP reporting). CSI-RS for BM refers to an NZP CSI-RS in which a repetition parameter with an enable or disable value is configured between CSI-RSs and trs-information is not configured as true.

[0112] Table 4-3

[0113] Valid TCI state configuration when the target antenna port is CSI-RS for BM

[0114] (For L1 RSRP reporting)

[0115]

[0116] Table 4-4 shows the valid TCI state configuration when the target antenna port is PDCCH DMRS.

[0117] Table 4-4 Valid TCI state configuration when the target antenna port is PDCCH DMRS

[0118]

[0119] Table 4-5 shows the valid TCI state configuration when the target antenna port is PDSCH DMRS.

[0120] Table 4-5 Valid TCI state configuration when the target antenna port is PDSCH DMRS

[0121]

[0122] In the typical QCL configuration method according to Table 4-1 to Table 4-5, each operating target antenna port and reference antenna port are configured and operated as "SSB" → "TRS" → "CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS". Thus, by linking the statistical features that can be measured from the SSB and TRS to each antenna port, the UE can be assisted in receiving operation.

[0123] In the following, the attached Figure 1 The embodiments of the present disclosure are described below using a 5G system as an example, but the embodiments of the present disclosure may be applied to other communication systems with similar technical backgrounds or channel types. For example, LTE or LTE-A mobile communications and mobile communication technologies developed after 5G may be included. Therefore, as determined by those skilled in the art, the embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0124] In addition, in describing the present disclosure, when it is determined that the detailed description of the relevant function or configuration may unnecessarily confuse the subject matter of the present disclosure, its detailed description will be omitted. In addition, the terms to be described later are terms defined based on their functions in the present disclosure and may change according to the intention or habit of the user or operator. Therefore, they should be defined based on the content of the entire specification.

[0125] In addition, unless otherwise specified, the abbreviations used in the specification have the following meanings.

[0126] -CSI: Channel State Information

[0127] -RS: Reference signal

[0128] -L1: Layer 1

[0129] -RSRP: Reference Signal Received Power

[0130] -DL: Downlink

[0131] -UL: Uplink

[0132] -BWP: Bandwidth Part

[0133] -NZP CSI-RS: Non-Zero Power CSI-RS

[0134] -CSI-IM: CSI interference measurement

[0135] -VZP CSI-RS: Virtual Zero Power CSI-RS

[0136] -CSI-VIM: CSI Virtual Interference Measurement

[0137] Figure 6 is a diagram illustrating a signal processing procedure of a transceiver supporting time-only processing according to an embodiment of the present disclosure.

[0138] refer to Figure 6 , which shows the operation of a transceiver for sending and receiving ultra-high frequency broadband signals without processing frequency signals. For the transmitter, the channel-coded symbols are buffered and converted into broadband baseband signals by signal processing. Next, the broadband baseband signal is amplified into an ultra-high frequency signal through a pulse shaping filter and then transmitted. The receiver first reduces the signal received by the antenna, converts the reduced signal into a broadband baseband signal, and converts the converted signal into a digital signal and stores the digital signal through an analog-to-digital converter (ADC). Next, the corresponding channel is compensated by time domain equalization, and the digital signal is converted into a modulated signal and stored by signal processing. Next, the received signal is converted by a demodulator. As described above, the transmitter and receiver according to the embodiment of the present disclosure may not undergo an FFT or IFFT block for processing a frequency signal in the signal processing process (the process of converting the symbol into a broadband baseband signal), and a transmitter or receiver supporting such a signal processing process is referred to as a transceiver supporting only time processing. In the present disclosure, as a transceiver supporting time-only processing, a transmitter and a receiver supporting time-only processing, a transmitter supporting time-only processing and a receiver not supporting time-only processing, a transmitter not supporting time-only processing and a receiver supporting time-only processing, and a receiver not supporting time-only processing but supporting time-only processing only for channel estimation may be used as the transceiver supporting time-only processing.

[0139] Fig. 7A is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure, Figure 7B is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure, Figure 7C is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure, and Fig.7D is a diagram showing an embodiment of a method for transmitting a CSI-RS signal by a transmitter according to an embodiment of the present disclosure.

[0140] refer to Fig. 7A , Fig. 7Ais a diagram showing an example in which the entire RF band is an activated BWP and a CSI-RS is transmitted using a partial band included in the activated BWP; Figure 7B , Figure 7B is a diagram showing an example in which a part of the entire RF band is an activated BWP and a CSI-RS is transmitted using the activated BWP band; Figure 7C , Figure 7C is a diagram showing an example of transmitting a CSI-RS using a portion of an OFDM symbol; and Fig.7D , Fig.7D is a diagram showing an example in which a CSI-RS using a first frequency band portion is transmitted by beam 1 and a CSI-RS using a second frequency band portion is transmitted by beam 2 .

[0141] According to an embodiment of the present disclosure, FIG. 7A to FIG. 7D In case of the CSI-RS transmission method shown, each of the transmitter and the receiver may assume the following conditions.

[0142] [Table 5]

[0143]

[0144] The channel estimation method according to the present disclosure proposes a method of sending CSI-RS to a DL BWP or an activated DL BWP received by a UE as described above, and performing CSI reporting for time-frequency resources other than the DL BWP or the activated DL BWP to which the CSI-RS is sent or for a DL BWP that is not received.

[0145] Example of a receiver algorithm

[0146] If the time samples in the received nth pilot symbol are Then y n It can be expressed as the following equation 1.

[0147] y n =H n F * s n +z n′ Equation 1

[0148] here, represents the channel matrix; and F * Represents the IFFT matrix. represents a transmitted pilot vector, such as a Zadoff-chu sequence or a DFT-spread pilot symbol; and represents additive white Gaussian noise The channel matrix can be expressed as H = F * ΛF (where ). Here, hn represents the frequency channel response of the nth pilot symbol. Therefore, y n It can be expressed as the following equation 2.

[0149]

[0150] According to the embodiments of the present disclosure, since the pilot symbol is sent in a part of the bandwidth instead of the entire bandwidth, the pilot vector s n You can use p n and the frequency selection matrix Φ n Therefore, Equation 1 can be expressed as the following Equation 3.

[0151]

[0152] The relationship between the frequency channel and the channel impulse response (CIR) is h n =Fg n , where g n represents CIR. Therefore, y n It can be expressed as the following equation 4.

[0153]

[0154] Based on the cyclic prefix of the transmitted symbol, it can be assumed that all zeros are present after the CP length. In this case, And y n It can be expressed as the following equation 5.

[0155]

[0156] Here, Π represents the selection matrix.

[0157] Hereinafter, a method of receiving a signal using a time sample of a received pilot symbol according to an embodiment of the present disclosure will be described.

[0158] Figure 8 Detailed description is a flow chart showing the operation of a UE performing channel estimation according to an embodiment of the present disclosure.

[0159] refer to Figure 8First, in operation 801, the UE may simultaneously process signals received within a window configured with a measurement window by the base station. This may mean that channels having the same path or the same channel statistics are measured for pilot signals received within the configured window. For example, it may be configured to receive L pilot symbols in a window. Next, in operation 802, the UE may store the signal received for each pilot symbol in a buffer via an analog-to-digital converter (ADC). In operations 803 and 804, the time samples of the pilot symbols may be divided into two groups. The two separate groups are samples that do not overlap with each other, and the sum of the two groups of samples may be equal to or less than the entire time sample. The first group is a group used for channel estimation, and the second group is a group used to determine the number of non-zero elements in the CIR.

[0160] The first set of samples for channel estimation is randomly selected from all symbols, and when the selected samples are collected, it can be expressed as the following Equation 6.

[0161]

[0162] Here, Λ n Represents the selection of random selection matrix.

[0163] if Satisfy y′ n , then equation (6) can be expressed as the following equation 7.

[0164] y′ n =U n g′ n +z n Equation 7

[0165] If samples of L pilot symbols are accumulated, it can be expressed as follows.

[0166]

[0167] If Equation 8 is rearranged in delay order, it can be expressed as the following Equation 9.

[0168]

[0169] Here, satisfying ∑ n，i =[U n-L (:,i)...U n (:, i)] and d n，i =[g′ n-L (i) ... g′ n (i)]. Here, since Equation 9 is an underdetermined system, the receiver may iteratively estimate the CIR as shown in Equations 10 and 11 below.

[0170]

[0171] Here, R n Represents the covariance matrix of the channel taps. Since the UE can process in the time domain, this reception method has the advantage of not requiring FFT operations, and the reception performance improves as the number of main paths of the CIR channel decreases. In addition, since the CIR on the delay axis is estimated using samples in the time domain, the channel on the frequency axis can be restored when FFT is performed after the estimation is completed, and the channel in the entire frequency domain can be estimated even if the CSI-RS does not transmit the entire frequency band.

[0172] The second set can be used to estimate the number of non-zero elements of the CIR. Figure 8 , in operation 805, an algorithm may be used to estimate the number of non-zero elements that minimize the residual, such as orthogonal matching pursuit (OMP) for each L measurements. For example, if the number of non-zero elements that minimize the residual in the nth measurement is k n , then select the one with the largest P(k n ) n .

[0173] refer to Figure 8 In operation 807, the UE determines the selected k n Is it greater than or less than K? max If k n Greater than K max , as in operation 808, the UE uses an existing frequency-based channel estimation technique (linear minimum mean square error, LMMSE); if k n Less than K max , as in operation 806, the number of iterations of the CIR estimator is configured to be k n , and sample-based channel estimation according to an embodiment of the present disclosure may be used.

[0174] [UE operation for CSI reporting]

[0175] Hereinafter, a method of reporting CSI for a time resource or a frequency resource in which a CSI-RS is not transmitted will be described.

[0176] The UE may instruct the base station to use time resources or frequency resources to report CSI. The type of CSI may include at least one of the following elements.

[0177] -CQI: Channel Quality Indicator

[0178] -PMI: Precoding matrix indicator

[0179] -CRI: CSI-RS resource indicator

[0180] -SSBRI: SS / PBCH Block Resource Indicator

[0181] -LI: Layer indicator

[0182] -RI: Rank indicator

[0183] -L1-RSRP

[0184] In order to report CSI elements, the UE can obtain the following three pieces of information through high-layer signaling.

[0185] -Report settings: CSI report configuration information consisting of N-numbered CSI-ReportConfig

[0186] - Resource settings: CSI report configuration information consisting of M-numbered CSI-ResourceConfig

[0187] - Trigger status list: It may include at least one or more CSI-ReportConfig lists capable of measuring channels and interference by resource set IDs.

[0188] Hereinafter, a report setting method, a resource setting method, a report configuration method, a triggering and activation method, a processing standard, a CSI definition, a CSI-RS definition and a CSI reporting method for CSI reporting according to an embodiment of the present disclosure will be described.

[0189] Report Settings

[0190] The channel estimation method according to an embodiment of the present disclosure is a method of transmitting a CSI-RS to a DL BWP received by a UE or an activated DL BWP and performing CSI reporting on a time resource and a frequency resource of a DL BWP other than the DL BWP or not received.

[0191] The existing report setting method is as follows. A report setting (CSI-ReportConfig) can be configured for one DL BWP, and channel measurement can be performed only for the configured DL BWP. CSI-ReportConfig may include at least one of a codebook configuration for CSI reporting, time domain information for reporting, frequency resolution information for CQI and PMI reporting, and measurement restriction information for CSI reporting. The time domain information for reporting may include reportConfigType information for reporting CSI, and may include one of aperiodic, semi-persistent on PUCCH, semi-persistent on PUSCH, and periodic. Aperiodic refers to a one-time report, semi-persistent on PUCCH refers to semi-persistent transmission through PUCCH, semi-persistent on PUSCH refers to semi-persistent transmission through PUSCH, and periodicity refers to periodic transmission. The measurement restriction information for CSI reporting may include time restriction information for channel measurement or time restriction information for interference measurement. The codebook information may include codebook type and restriction.

[0192] The existing CSI-ReportConfig as described above may be configured to include the following information.

[0193]

[0194]

[0195]

[0196] According to an embodiment of the present disclosure, a report setting (CSI-ReportConfig) may be configured for a first DL BWP and a second DL BWP that overlap in time or frequency band. In this case, channel measurement may be performed on the first DL BWP through NZP CSI-RS and CSI-IM, and measurement may be performed on the second DL BWP through VZP CSI-RS or CSI-VIM. Here, VZP CSI-RS and CSI-VIM may refer to virtual CSI-RS and CSI-IM that are not actually sent by the base station. For example, a base station according to an embodiment of the present disclosure may configure a virtual CSI-RS or CSI-IM, and may instruct the UE to assume that CSI-RS or CSI-IM is not sent in a frequency domain where CSI-RS or CSI-IM is sent to estimate the channel and perform a report, thereby estimating and reporting the corresponding channel even in a frequency domain where CSI-RS and CSI-IM are not sent. CSI-ReportConfig may include at least one of a codebook configuration for CSI reporting, time domain information for reporting, frequency resolution information for CQI and PMI reporting, and measurement restriction information for CSI reporting. The time domain information for reporting may include ReportConfigType information for reporting CSI, and it may include one of aperiodic, semi-persistent on PUCCH, semi-persistent on PUSCH, and periodic. Aperiodic refers to a one-time report, semi-persistent on PUCCH refers to semi-persistent transmission through PUCCH, semi-persistent on PUSCH refers to semi-persistent transmission through PUSCH, and periodic refers to periodic transmission. The measurement restriction information for CSI reporting may include time restriction information for channel measurement or time restriction information for interference measurement, and the codebook information may include a codebook type (type I, type II) and restrictions. The measurement restriction information for CSI reporting based on VZP CSI-RS or CSI-VIM may include time restriction information for the channel of the second DL BWP or time restriction information for interference measurement. The codebook information may include a codebook type (type III) and restriction information.

[0197] According to another embodiment of the present disclosure, a report setting (CSI-ReportConfig) may be configured for a DL BWP. At this time, for the configured DL BWP, channel measurement may be performed through NZP CSI-RS and CSI-IM; and for the time domain or frequency domain other than the configured DL BWP, measurement may be performed through VZP CSI-RS or CSI-VIM. CSI-ReportConfig may include at least one of a codebook configuration for CSI reporting, time domain information for reporting, frequency resolution information for CQI and PMI reporting, and measurement restriction information for CSI reporting. The time domain information for reporting may include ReportConfigType information for reporting CSI, and may include one of aperiodic, semi-persistent on PUCCH, semi-persistent on PUSCH, and periodic. Aperiodic refers to a one-time report, semi-persistent on PUCCH refers to semi-persistent transmission through PUCCH, semi-persistent on PUSCH refers to semi-persistent transmission through PUSCH, and periodic refers to periodic transmission. The measurement restriction information for CSI reporting may include time restriction information for channel measurement or time restriction information for interference measurement, and the codebook information may include a codebook type (type I, type II) and restriction. The measurement restriction information for CSI reporting based on VZPCSI-RS or CSI-VIM may include time restriction information for channels in the time domain or frequency domain other than the configured DL BWP or time restriction information for interference measurement, and the codebook information may include a codebook type (type III) and restriction information.

[0198] Resource Settings

[0199] The existing resource setting method is as follows. CSI-ResourceConfig includes a list of S-numbered CSI resource sets, and each list includes NZP CSI-RS, SS / PBCH set and CSI-IM resource set information. Each CSI resource setting is configured for a DL BWP, and the report setting corresponding to the resource setting is also configured for the same DL BWP. The CSI resource setting includes at least one or more of the following information for channel or interference measurement.

[0200] -CSI-IM resource: used for interference measurement

[0201] -NZP CSI-RS resources for interference measurement: used for interference measurement

[0202] -NZP CSI-RS resources for channel measurement: used for channel measurement

[0203] When the UE estimates the channel using one or more NZP CSI-RS resources for one CSI report and measures interference using one or more CSI-IMs, it can be assumed that for each resource, the NZP CSI-RS and the CSI-IM are Type D quasi co-located (QCL-Type D). When the UE measures interference using the NZP CSI-RS, it can be assumed that the NZP CSI-RS used to measure the channel and the CSI-IM and NZP CSI-RS used to measure the interference are quasi co-located like QCL-Type D.

[0204] The existing CSI-ResourceConfig as described above may be configured to include the following information.

[0205]

[0206] According to an embodiment of the present disclosure, CSI-ResourceConfig includes a list of S-numbered CSI resource sets, and each list includes at least one of the NZP CSI-RS set, SS / PBCH set, CSI-IM resource set, VZP CSI-RS set, and CSI-VIM resource set information. From the perspective of each CSI resource setting, the NZP CSI-RS set, SS / PBCH set, and CSI-IM resource set are configured for the first DL BWP, and the VZP CSI-RS set and CSI-VIM resource set are configured for the second DL BWP. Report settings corresponding to the resource settings may also be configured for the first DL BWP and the second DL BWP. The CSI resource setting may include at least one or more of the following information for channel or interference measurement.

[0207] -CSI-IM resource: used for interference measurement of the first DL BWP

[0208] - NZP CSI-RS resources for interference measurement: used for interference measurement of the first DL BWP

[0209] - NZP CSI-RS resources for channel measurement: used for channel measurement of the first DL BWP

[0210] - VZP CSI-RS resources for channel measurement: used for channel measurement of the second DL BWP

[0211] -CSI-VIM resource: used for interference measurement of the second DL BWP

[0212] - VZP CSI-RS resources for interference measurement: used for interference measurement of the second DL BWP

[0213] When the UE estimates the channel using one or more NZP CSI-RS resources for one CSI report and measures interference using one or more CSI-IMs, it may be assumed that the NZP CSI-RS and CSI-IM are Type D quasi co-located (QCL-Type D) for each resource.

[0214] When the UE uses one or more VZP CSI-RS resources for one CSI report to estimate the channel and uses one or more CSI-VIMs to measure interference, it can be assumed that for each resource, the VZP CSI-RS and CSI-VIM are Type D quasi co-sited (QCL-Type D). When the UE uses NZP CSI-RS to measure interference, it can be assumed that the NZP CSI-RS for measuring the channel and the CSI-IM and NZP CSI-RS for measuring interference are quasi co-sited like QCL-Type D. When the UE uses VZP CSI-RS to measure interference, it can be assumed that the VZP CSI-RS for measuring the channel and the CSI-VIM and VZP CSI-RS for measuring interference are quasi co-sited like QCL-Type D.

[0215] According to another embodiment of the present disclosure, CSI-ResourceConfig includes an S-numbered CSI resource set list, and each list includes at least one of an NZP CSI-RS set, an SS / PBCH set, a CSI-IM resource set, a VZP CSI-RS set, and a CSI-VIM resource set information. From the perspective of each CSI resource setting, an NZP CSI-RS set, an SS / PBCH set, and a CSI-IM resource set are configured for one DL BWP, a VZP CSI-RS set and a CSI-VIM resource set are configured for resources other than the configured DL BWP, and a report setting corresponding to the resource setting may also be configured for the DL BWP and resources other than the DL BWP. The CSI resource setting may include at least one or more of the following information for channel or interference measurement.

[0216] -CSI-IM resource: used for interference measurement of DL BWP

[0217] -NZP CSI-RS resources for interference measurement: used for interference measurement of DL BWP

[0218] - NZP CSI-RS resources for channel measurement: used for channel measurement of DL BWP

[0219] - VZP CSI-RS resources for channel measurement: used for channel measurement of resources other than DL BWP

[0220] -CSI-VIM resource: used for interference measurement of resources other than DL BWP

[0221] - VZP CSI-RS resources for interference measurement: used for interference measurement of resources other than DL BWP

[0222] When the UE uses one or more NZP CSI-RS resources for one CSI report to estimate the channel and one or more CSI-IMs to measure interference, it can be assumed that for each resource, the NZP CSI-RS and the CSI-IM are Type D quasi co-sited (QCL-Type D). When the UE uses one or more VZP CSI-RS resources for one CSI report to estimate the channel and uses one or more CSI-VIMs to measure interference, it can be assumed that for each resource, the VZP CSI-RS and the CSI-VIM are Type D quasi co-sited (QCL-Type D). When the UE uses NZP CSI-RS to measure interference, it can be assumed that the NZP CSI-RS for measuring the channel and the CSI-IM and NZP CSI-RS for measuring the interference are quasi co-sited like QCL-Type D. When the UE uses VZP CSI-RS to measure interference, it can be assumed that the VZP CSI-RS for measuring the channel and the CSI-VIM and VZP CSI-RS for measuring the interference are quasi co-sited like QCL-Type D.

[0223] According to another embodiment of the present disclosure, CSI-ResourceConfig includes an S-numbered CSI resource set list, and each list includes at least one of an NZP CSI-RS set, an SS / PBCH set, a CSI-IM resource set, a VZP CSI-RS set, and a CSI-VIM resource set information. From the perspective of each CSI resource setting, an NZP CSI-RS set, an SS / PBCH set, a CSI-IM resource set, a VZP CSI-RS set, and a CSI-VIM resource set are configured for one DL BWP, and a report setting corresponding to the resource setting can be configured for the DL BWP. The CSI resource setting may include at least one or more of the following information for channel or interference measurement.

[0224] -CSI-IM resource: used for interference measurement of DL BWP

[0225] -NZP CSI-RS resources for interference measurement: used for interference measurement of DL BWP

[0226] - NZP CSI-RS resources for channel measurement: used for channel measurement of DL BWP

[0227] - VZP CSI-RS resources for channel measurement: used for channel measurement of DL BWP

[0228] -CSI-VIM resource: Interference measurement for DL ​​BWP

[0229] - VZP CSI-RS resources for interference measurement: used for interference measurement of DL BWP

[0230] When the UE estimates the channel using one or more NZP CSI-RS resources for one CSI report and measures interference using one or more CSI-IMs, it may be assumed that the NZP CSI-RS and CSI-IM are Type D quasi co-located (QCL-Type D) for each resource.

[0231] When the UE uses one or more VZP CSI-RS resources in one CSI report to estimate the channel and uses one or more CSI-VIMs to measure interference, it can be assumed that for each resource, the VZP CSI-RS and CSI-VIM are Type D quasi co-located (QCL-Type D). When the UE uses NZP CSI-RS to measure interference, it can be assumed that the NZP CSI-RS for measuring the channel and the CSI-IM and NZP CSI-RS for measuring interference are quasi co-located like QCL-Type D. When the UE uses VZP CSI-RS to measure interference, it can be assumed that the VZP CSI-RS for measuring the channel and the CSI-VIM and VZP CSI-RS for measuring interference are quasi co-located like QCL-Type D.

[0232] Report Configuration

[0233] The dependencies between CSI parameters are as follows.

[0234] -LI is calculated based on the reported CQI, PMI, IR and CRI.

[0235] - CQI is calculated based on the reported PMI, RI and CRI.

[0236] -PMI is calculated based on reported RI and CRI.

[0237] -RI is calculated based on the reported CRI.

[0238] The relationship between the CSI-RS configuration and the CSI report configuration is shown in Table 6 below.

[0239] [Table 6]

[0240]

[0241] The UE may be configured with a subband size according to the BWP size for CSI reporting, and based on this, the resolution of CQI and PMI may be determined. When reporting subband PMI or CQI, wideband PMI or CQI may be fed back, and subband PMI or CQI may also be fed back.

[0242] According to an embodiment of the present disclosure, when reporting different BWPs, the dependencies between CSI parameters are as follows.

[0243] The dependency relationship between CSI parameters related to the NZP CSI-RS or CSI-IM transmitted to the first DL BWP is as follows.

[0244] -LI is calculated based on CQI, PMI, IR and CRI reported according to NZP CSI-RS or CSI-IM.

[0245] - CQI is calculated based on PMI, RI and CRI reported according to NZP CSI-RS or CSI-IM.

[0246] -PMI is calculated based on RI and CRI reported from NZP CSI-RS or CSI-IM.

[0247] -RI is calculated based on the CRI reported from NZP CSI-RS or CSI-IM.

[0248] The dependency between CSI parameters related to the VZP CSI-RS or CSI-VIM transmitted to the second DL BWP is as follows.

[0249] -LI is calculated based on CQI, PMI, IR and CRI reported according to NZP CSI-RS or CSI-IM.

[0250] - CQI is calculated based on PMI, RI and CRI reported according to NZP CSI-RS or CSI-IM.

[0251] -PMI is calculated based on RI and CRI reported from NZP CSI-RS or CSI-IM.

[0252] -RI is calculated based on the CRI reported from NZP CSI-RS or CSI-IM.

[0253] The relationship between the CSI-RS configuration and the CSI report configuration is shown in Table 7 below.

[0254] [Table 7]

[0255]

[0256] The UE may be configured with a sub-band size according to the BWP size for CSI reporting, and the resolution of CQI and PMI may be determined based on this. When reporting sub-band PMI or CQI, wideband PMI or CQI may be fed back, and sub-band PMI or CQI may also be fed back. The triggering method of Table 7 includes a method for configuring triggering the first DL BWP and triggering the second DL BWP respectively, and a method for triggering the first DL BWP and the second DL BWP simultaneously. Here, the reporting period of the first DL BWP is configured to be shorter than the reporting period of the second DL BWP.

[0257] When resources other than DL BWP are reported according to another embodiment of the present disclosure, the dependency relationship between CSI parameters is as follows.

[0258] The dependency between the CSI parameters transmitted to the first DL BWP through the NZP CSI-RS or CSI-IM is as follows.

[0259] -LI is calculated based on CQI, PMI, IR and CRI reported according to NZP CSI-RS or CSI-IM.

[0260] - CQI is calculated based on PMI, RI and CRI reported according to NZP CSI-RS or CSI-IM.

[0261] -PMI is calculated based on RI and CRI reported from NZP CSI-RS or CSI-IM.

[0262] -RI is calculated based on the CRI reported by NZP CSI-RS or CSI-IM. The dependency between the CSI parameters sent to the second DL BWP by VZP CSI-RS and CSI-VIM is as follows.

[0263] -LI is calculated based on CQI, PMI, IR and CRI reported according to VZP CSI-RS or CSI-VIM.

[0264] -CQI is calculated based on PMI, RI and CRI reported according to VZP CSI-RS or CSI-VIM.

[0265] -PMI is calculated based on RI and CRI reported according to VZP CSI-RS or CSI-VIM.

[0266] -RI is calculated based on the CRI reported from VZP CSI-RS or CSI-VIM.

[0267] The relationship between the CSI-RS configuration and the CSI report configuration is shown in Table 8 below.

[0268] [Table 8]

[0269]

[0270] The UE may be configured with a sub-band size according to the BWP size for CSI reporting, and the resolution of CQI and PMI may be determined based on this. When reporting sub-band PMI or CQI, wideband PMI or CQI may be fed back, and sub-band PMI or CQI may also be fed back. The triggering method of Table 8 includes a method for configuring triggering the first DL BWP and triggering the second DL BWP respectively, and a method for triggering the first BWP and the second BWP simultaneously. Here, the reporting period of the first DL BWP may be configured to be shorter than the reporting period of the second DL BWP.

[0271] Fig. 9 is a flowchart illustrating the operation of a UE according to an embodiment of the present disclosure.

[0272] refer to Fig. 9 At operation 901, the UE may receive configuration information for CSI reporting from a base station. The configuration information for CSI reporting may include at least one of a report setting, a resource setting, and a trigger status information list.

[0273] In operation 902, the UE may measure a channel or interference based on the received configuration information for CSI reporting. According to an embodiment of the present disclosure, the UE uses the NZP CSI-RS resources, CSI-IM resources, VZP CSI-RS resources, and CSI-VIM resources included in the configuration information to measure the channel or interference of the entire frequency band including the frequency band where the CSI-RS is not transmitted according to the above-mentioned embodiment. According to an embodiment of the present disclosure, the UE may use the NZP CSI-RS resources and the CSI-IM resources to measure the channel or interference of the first DL BWP frequency band, and may use the VZP CSI-RS resources and the CSI-VIM resources to measure the channel or interference of the second DL BWP frequency band. According to another embodiment of the present disclosure, the UE may use the NZP CSI-RS resources and the CSI-IM resources to measure the channel or interference in the DL BWP frequency band, and may use the VZP CSI-RS resources and the CSI-VIM resources to measure the channel or interference in the frequency band other than the DL BWP frequency band.

[0274] At operation 903, the UE may generate channel state information for CSI reporting based on the measurement result. In this case, according to an embodiment of the present disclosure, the dependency relationship between the CSI parameters through NZP CSI-RS, CSI-IM, VZP CSI-RS and CSI-VIM is as described above.

[0275] At operation 904, the UE may report the measured channel state information to the base station.

[0276] Fig.10 is a flowchart illustrating the operation of a base station according to an embodiment of the present disclosure.

[0277] refer to Fig.10 In operation 1001, the base station may send configuration information for CSI reporting to the UE. The configuration information for CSI reporting may include at least one of a report setting, a resource setting, and a trigger status information list.

[0278] In operation 1002, according to the above-described embodiments of the present disclosure, the UE having received the configuration information for CSI reporting may generate channel state information by performing channel measurement, and the base station may receive a channel state information report from the UE.

[0279] In order to implement the above-mentioned embodiments of the present disclosure, the transceiver, memory and processor of each of the UE and the base station are respectively Fig.11 and Fig.12 Shown in.

[0280] Fig.11 is a block diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0281] refer to Fig.11 , the UE may include a transceiver 1101, a memory 1102, and a processor 1103. However, the components of the UE are not limited to the above examples. For example, the UE may include more or fewer components than the above components. In addition, the transceiver 1101, the memory 1102, and the processor 1103 may be implemented in the form of a single chip.

[0282] According to an embodiment of the present disclosure, the transceiver 1101 may send signals to and receive signals from a base station. The above-mentioned signals may include control information and data. To this end, the transceiver 1101 may include an RF transmitter that up-converts and amplifies the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. In addition, the transceiver 1101 may receive a signal through a wireless channel, output the received signal to the processor 1103, and send a signal output from the processor 1103 through a wireless channel.

[0283] According to an embodiment of the present disclosure, the memory 1102 may store programs and data required for UE operation. In addition, the memory 1102 may store control information or data included in the signal sent and received by the UE. The memory 1102 may be composed of a storage medium or a combination of storage media such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk (CD)-ROM, and a digital versatile disk (DVD). In addition, the memory 1102 may be composed of a plurality of memories. According to an embodiment of the present disclosure, the memory 1102 may store a program for controlling and receiving operations for reducing UE power consumption.

[0284] According to an embodiment of the present disclosure, the processor 1103 may control a series of processes in which the UE may operate according to the above-mentioned embodiments of the present disclosure.

[0285] Fig.12 is a block diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0286] refer to Fig.12 , the base station may include a transceiver 1201, a memory 1202, and a processor 1203. However, the components of the base station are not limited to the above examples. For example, the base station may include more or fewer components than the above components. In addition, the transceiver 1201, the memory 1202, and the processor 1203 may be implemented in the form of a single chip.

[0287] According to an embodiment of the present disclosure, the transceiver 1201 may send a signal to a UE and receive a signal from a UE. The above-mentioned signal may include control information and data. To this end, the transceiver 1201 may include an RF transmitter that up-converts and amplifies the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. In addition, the transceiver 1201 may receive a signal through a wireless channel, output the received signal to the processor 1203, and send a signal output from the processor 1203 through a wireless channel.

[0288] According to an embodiment of the present disclosure, the memory 1202 may store programs and data required for the operation of the base station. In addition, the memory 1202 may store control information or data included in the signal sent and received by the base station. The memory 1202 may be composed of a storage medium such as a ROM, RAM, hard disk, CD-ROM or DVD, or a combination of storage media. In addition, the memory 1202 may be composed of a plurality of memories. According to an embodiment of the present disclosure, the memory 1202 may store a program for generating and sending control information for reducing UE power consumption of the base station.

[0289] According to an embodiment of the present disclosure, the processor 1203 may control a series of processes so that the base station may operate according to the above disclosed embodiment.

[0290] The methods disclosed in the claims of the present disclosure and / or the methods of the embodiments described in the specification may be implemented in hardware, software, or a combination of hardware and software.

[0291] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in the electronic device. The at least one program may include instructions that cause the electronic device to perform the method defined by the attached claims and / or disclosed herein according to various embodiments of the present disclosure.

[0292] The program (software module or software) may be stored in a non-volatile memory, including random access memory and flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disc-ROM (CD-ROM), DVD or other type of optical storage, or magnetic tape cassette. Alternatively, any combination of some or all of them may form a memory storing the program. In addition, a plurality of such memories may be included in the electronic device.

[0293] In addition, the program may be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), and a storage area network (SAN), or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, a separate storage device on a communication network can access the portable electronic device.

[0294] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiments presented. However, for ease of description, the singular form or plural form is appropriately selected for the presented situation, and the present disclosure is not limited to elements expressed in the singular or plural. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0295] Although the present disclosure has been shown and described with reference to various embodiments of the present disclosure, it will be understood by those skilled in the art that various changes may be made to its form and details without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. In addition, if necessary, the above-mentioned corresponding embodiments may be used in combination. For example, one embodiment of the present disclosure may be partially combined with another embodiment to operate a base station and a terminal. In addition, the embodiments of the present disclosure may be applied to other communication systems, and other variations may also be implemented based on the technical ideas of the embodiments of the present disclosure. For example, the embodiments may be applied to LTE, 5G or NR systems.

Claims

1. A method performed by a terminal in a communication system, the method comprising: receiving, from a base station, information related to first channel state information (CSI) resources corresponding to a first frequency band and information related to second CSI resources corresponding to a second frequency band, wherein at least a portion of the second frequency band is different from the first frequency band; receiving a CSI-related signal from the base station on the first CSI resource corresponding to the first frequency band; identifying the first CSI resource corresponding to the first frequency band for which the CSI-related signal is received, and the second CSI resource corresponding to the second frequency band for which the CSI-related signal is not received; Obtaining CSI of the second frequency band based on the first CSI resource and the second CSI resource; as well as sending the CSI of the second frequency band to the base station, wherein the CSI-related signal is received on multiple symbols, Wherein, when the number of non-zero elements of a channel impulse response CIR in the CSI-related signal received on at least part of the multiple symbols is less than a predetermined value, the CSI of the second frequency band is obtained based on sampling-based channel estimation using the number of non-zero elements of the CIR in the CSI-related signal received on at least part of the multiple symbols.

2. The method according to claim 1, wherein: The first frequency band corresponds to a first downlink bandwidth part DLBWP, and the second frequency band corresponds to a second DL BWP.

3. The method according to claim 1, wherein: The first CSI resource includes a non-zero power CSI reference signal NZP-CSI RS resource or a CSI interference measurement CSI-IM resource, and The second CSI resource includes a virtual zero power CSI reference signal VZP CSI-RS resource or a CSI virtual interference measurement CSI-VIM resource.

4. A method performed by a base station in a communication system, the method comprising: Sending to a terminal information related to a first channel state information (CSI) resource corresponding to a first frequency band and information related to a second CSI resource corresponding to a second frequency band, wherein at least a portion of the second frequency band is different from the first frequency band; Sending a CSI-related signal to the terminal on the first CSI resource corresponding to the first frequency band; as well as receiving CSI of the second frequency band from the terminal, The CSI of the second frequency band is obtained based on the first CSI resource corresponding to the first frequency band and transmitting the CSI-related signal and the second CSI resource corresponding to the second frequency band and not transmitting the CSI-related signal, wherein the CSI-related signal is sent on multiple symbols, and Wherein, when the number of non-zero elements of a channel impulse response CIR in the CSI-related signal sent on at least part of the multiple symbols is less than a predetermined value, the CSI of the second frequency band is obtained based on sampling-based channel estimation using the number of non-zero elements of the CIR sent on at least part of the multiple symbols.

5. The method according to claim 4, wherein: The first frequency band corresponds to a first downlink bandwidth part DLBWP, and the second frequency band corresponds to a second DL BWP.

6. The method according to claim 4, wherein: The first CSI resource includes a non-zero power CSI reference signal NZP-CSI RS resource or a CSI interference measurement CSI-IM resource, and The second CSI resource includes a virtual zero power CSI reference signal VZP CSI-RS resource or a CSI virtual interference measurement CSI-VIM resource.

7. A terminal in a communication system, the terminal comprising: Transceiver; as well as At least one processor configured to: receiving, from a base station, information related to first channel state information (CSI) resources corresponding to a first frequency band and information related to second CSI resources corresponding to a second frequency band, wherein at least a portion of the second frequency band is different from the first frequency band; receiving a CSI-related signal from the base station on the first CSI resource corresponding to the first frequency band; identifying the first CSI resource corresponding to the first frequency band for which the CSI-related signal is received, and the second CSI resource corresponding to the second frequency band for which the CSI-related signal is not received; Obtaining CSI of the second frequency band based on the first CSI resource and the second CSI resource; as well as sending the CSI of the second frequency band to the base station, wherein the CSI-related signal is received on a plurality of symbols, and Wherein, when the number of non-zero elements of a channel impulse response CIR in the CSI-related signal received on at least part of the multiple symbols is less than a predetermined value, the CSI of the second frequency band is obtained based on sampling-based channel estimation using the number of non-zero elements of the CIR in the CSI-related signal received on at least part of the multiple symbols.

8. The terminal according to claim 7, wherein: The first frequency band corresponds to a first downlink bandwidth part DLBWP, and the second frequency band corresponds to a second DL BWP.

9. The terminal according to claim 7, wherein: The first CSI resource includes a non-zero power CSI reference signal NZP-CSI RS resource or a CSI interference measurement CSI-IM resource, and The second CSI resource includes a virtual zero power CSI reference signal VZP CSI-RS resource or a CSI virtual interference measurement CSI-VIM resource.

10. A base station in a communication system, the base station comprising: Transceiver; as well as At least one processor configured to: Sending to a terminal information related to a first channel state information (CSI) resource corresponding to a first frequency band and information related to a second CSI resource corresponding to a second frequency band, wherein at least a portion of the second frequency band is different from the first frequency band; Sending a CSI-related signal to the terminal on the first CSI resource corresponding to the first frequency band; as well as receiving CSI of the second frequency band from the terminal, The CSI of the second frequency band is obtained based on the first CSI resource corresponding to the first frequency band and transmitting the CSI-related signal and the second CSI resource corresponding to the second frequency band and not transmitting the CSI-related signal, wherein the CSI-related signal is sent on multiple symbols, and Wherein, when the number of non-zero elements of a channel impulse response CIR in the CSI-related signal sent on at least part of the multiple symbols is less than a predetermined value, the CSI of the second frequency band is obtained based on sampling-based channel estimation using the number of non-zero elements of the CIR sent on at least part of the multiple symbols.

11. The base station according to claim 10, wherein: The first frequency band corresponds to a first downlink bandwidth part DLBWP, and the second frequency band corresponds to a second DL BWP.

12. The base station according to claim 10, wherein: The first CSI resource includes a non-zero power CSI reference signal NZP-CSI RS resource or a CSI interference measurement CSI-IM resource, and The second CSI resource includes a virtual zero power CSI reference signal VZP CSI-RS resource or a CSI virtual interference measurement CSI-VIM resource.

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